阅读说明：本技术 (Motor ) 是由 于 0000-00-00 设计创作，主要内容包括：本发明提供一种马达。根据本公开的一个实施方式的马达设置有壳体,定子芯压配合在该壳体中。用于分配和喷洒制冷剂的制冷剂供应槽形成在壳体的内周表面中。因此,可以均衡地供应制冷剂,而不必增加马达的尺寸或添加单独的部件。(The invention provides a motor. A motor according to one embodiment of the present disclosure is provided with a housing in which a stator core is press-fitted. A refrigerant supply groove for distributing and spraying refrigerant is formed in an inner circumferential surface of the housing. Therefore, the refrigerant can be uniformly supplied without increasing the size of the motor or adding a separate component.)

1. A motor, the motor comprising:

a housing provided with an accommodation space therein and provided with a refrigerant supply hole formed through an outer circumferential surface thereof in a radial direction;

a stator core disposed in the accommodation space and coupled to an inner circumferential surface of the housing;

a stator coil wound around the stator core;

a rotor core rotatably arranged and spaced apart from an inner circumferential surface of the stator core by a predetermined distance; and

a shaft coupled through a central portion of the rotor core,

wherein a refrigerant supply groove is recessed from a portion of an inner circumferential surface of the housing coupled to the stator core, and

wherein the refrigerant supply tank includes:

a main groove communicating with the refrigerant supply hole and extending in a circumferential direction of the stator core; and

the branch grooves extend along the axial direction on two sides of the main groove and are communicated with the main groove.

2. The motor according to claim 1, wherein the main groove and the inner peripheral surface of the housing facing the main groove form a main flow path, the main flow path being a path through which a refrigerant introduced via the refrigerant supply hole flows, and

wherein the branch grooves and the inner peripheral surface of the housing facing the branch grooves form branch flow paths via which the refrigerant from the main flow path is branched to both sides in the axial direction of the stator core.

3. The motor according to claim 1, wherein the main groove and the inner peripheral surface of the housing facing the main groove form a main flow path, the main flow path being a path through which a refrigerant introduced via the refrigerant supply hole flows,

wherein a portion of the branch groove overlapping with the inner peripheral surface of the housing in the radial direction forms a branch flow path together with the inner peripheral surface of the housing, and

wherein the refrigerant moving through the branch flow path is discharged into the accommodating space via a portion of the branch groove that is open toward the accommodating space.

4. The motor according to claim 1, wherein the branch groove is formed as a plurality of branch grooves in the circumferential direction of the stator core,

wherein the main groove has a predetermined width in the axial direction, and

wherein portions of the main grooves, where the branch grooves adjacent to each other are connected in the circumferential direction, are provided with bottle neck portions having a narrow width.

5. The motor according to claim 1, wherein the main groove has a predetermined width in the axial direction,

wherein the branch grooves each have a predetermined length in the axial direction, and

wherein a value obtained by adding a value of an axial width of the main slot to a sum of axial lengths of the branch slots located on both sides of the main slot is larger than a value of an axial length of the stator core.

6. The motor according to claim 1, wherein the inner peripheral surface of the housing is provided with a refrigerant dispersion surface arranged at an end of the branch groove, and

wherein the branch groove overlaps with the refrigerant dispersion surface in the axial direction.

7. The motor of claim 6, wherein the refrigerant dispersion surface is formed to be inclined in a direction away from the main groove.

8. The motor according to claim 1, wherein the inner peripheral surface of the housing is provided with refrigerant dispersion grooves formed to be recessed and connected to ends of the branch grooves, and

wherein each of the refrigerant dispersion grooves is formed in a quarter-spherical shape open toward the branch groove and the shaft.

9. The motor according to claim 1, wherein the outer circumferential surface of the housing is provided with a base portion formed to protrude outward and having a refrigerant storage space therein,

wherein an axial length of the base portion is formed longer than the stator core, and

wherein a portion of the housing where the base is formed is provided with a through hole communicating the refrigerant storage space and the accommodating space.

10. The motor of claim 9, wherein the receiving space comprises:

a first accommodation space disposed at one side of the stator core; and

a second accommodation space disposed at the other side opposite to the one side of the stator core,

wherein the through-hole is formed as a plurality of through-holes,

wherein one of the through holes communicates the first accommodating space and the refrigerant storage space, and another of the through holes communicates the second accommodating space and the refrigerant storage space, and

wherein a bridge portion forming a portion of the main groove is provided between the one of the plurality of through holes and the other of the plurality of through holes.

Technical Field

The present disclosure relates to a motor, and more particularly, to a motor having a structure in which a flow path through which a refrigerant flows is formed in an inner wall of a casing.

Background

The motor is a device that converts electric energy into mechanical energy, and is used as a driving source of various household appliances, electric vehicles, hybrid vehicles including an internal combustion engine, and the like.

As is well known, a motor includes a stator core, a stator coil, a rotor core, and a rotating shaft, and is operated by electric power applied to the stator coil.

Energy loss occurs in the process of converting electrical energy into mechanical energy, and energy loss is mainly expressed in the form of thermal energy.

When the temperature inside the motor excessively rises with the generation of heat, irreversible demagnetization of the permanent magnets included in the rotor may occur, and the efficiency of the motor may be reduced, or the motor may be stopped due to overheating of the stator coils.

As one of the causes of heat generation, heat is generated while a current flows through the stator coil. In particular, excessive heat may be generated at portions where the stator coils are bent to be bent or the stator coils are coupled to each other.

Prior art document 1 (chinese patent publication CN 204906112U) discloses a motor cooled by a refrigerant.

The motor disclosed in prior art document 1 has a structure in which the refrigerant moves in the axial direction through a flow path formed through the stator core.

Therefore, the motor may have the following problems: the magnetic path area is reduced and the size of the stator core is increased in the radial direction.

Further, since an additional component for distributing the refrigerant to each of the plurality of flow paths is required, the manufacturing and assembling processes may be complicated and the manufacturing cost may be increased.

Documents of the prior art

Patent document

Prior art documents: chinese patent gazette CN 204906112U (2015 year 12, 23 days)

Disclosure of Invention

The present disclosure is directed to providing a motor having a structure capable of solving the above-mentioned problems.

First, it is an aspect of the present disclosure to provide a motor having a structure capable of uniformly supplying refrigerant to both end portions of a stator core in an axial direction.

Another aspect of the present disclosure is to provide a motor having a structure capable of uniformly supplying refrigerant to both end portions of a stator core without increasing the size of the stator core.

Another aspect of the present disclosure is to provide a motor having a structure capable of distributing refrigerant in a circumferential direction of a stator core without adding an additional component.

Another aspect of the present disclosure is to provide a motor having a structure capable of spraying refrigerant moved to both end portions of a stator core toward a shaft.

In order to achieve the above aspect, a motor according to one embodiment of the present disclosure includes a housing in which a stator core is coupled to an inner circumferential surface of the housing.

A main flow path, which is a path along which a refrigerant moves in a circumferential direction of the stator core, is formed between the stator core and an inner circumferential surface of the housing.

Further, a branch flow path, which is a path through which the refrigerant moves in the axial direction of the stator core, is formed between the stator core and the inner peripheral surface of the housing.

The branch flow path communicates with the main flow path.

Further, a main groove is formed in an inner peripheral surface of the housing, and the main groove extends in a circumferential direction of the stator core.

Further, branch grooves are recessed in the inner peripheral surface of the housing, and these branch grooves extend in the axial direction of the stator core.

Further, the main flow path is a space between the main groove and an inner peripheral surface of the housing facing the main groove, and the branch flow path is a space between the branch groove and an inner peripheral surface of the housing facing the branch groove.

Further, a motor according to an embodiment of the present disclosure includes: a housing provided with an accommodation space therein and provided with a refrigerant supply hole formed through an outer circumferential surface thereof in a radial direction; a stator core disposed in the accommodation space and coupled to an inner circumferential surface of the housing; a stator coil wound around the stator core; a rotor core rotatably arranged and spaced apart from an inner circumferential surface of the stator core by a predetermined distance; and a shaft coupled through a central portion of the rotor core.

Further, a refrigerant supply groove is recessed from a portion of an inner circumferential surface of the housing coupled to the stator core.

Further, the refrigerant supply tank includes: a main groove communicating with the refrigerant supply hole and extending in a circumferential direction of the stator core; and the branch grooves extend along the axial direction at two sides of the main groove and are communicated with the main groove.

Further, the main groove and the inner peripheral surface of the housing facing the main groove form a main flow path, which is a path through which the refrigerant introduced via the refrigerant supply hole flows.

Further, the branch grooves and the inner peripheral surface of the housing facing the branch grooves form branch flow paths, and the refrigerant from the main flow path is branched to both sides in the axial direction of the stator core via the branch flow paths.

Further, the main groove and the inner peripheral surface of the housing facing the main groove form a main flow path, which is a path through which the refrigerant introduced via the refrigerant supply hole flows.

Further, a portion of the branch groove overlapping with the inner peripheral surface of the housing in the radial direction forms a branch flow path together with the inner peripheral surface of the housing, and the refrigerant moving through the branch flow path is discharged into the accommodating space via a portion of the branch groove opened toward the accommodating space.

Further, the branch grooves are formed in the circumferential direction of the stator core as a plurality of branch grooves, the main grooves have a predetermined width in the axial direction, and portions in the main grooves where the branch grooves adjacent to each other are connected in the circumferential direction are provided with bottle neck portions having a narrower width.

In addition, the main grooves have a predetermined width in the axial direction, and the branch grooves each have a predetermined length in the axial direction.

Further, a value obtained by adding a value of an axial width of the main slot to a sum of axial lengths of the branch slots located on both sides of the main slot is larger than a value of an axial length of the stator core.

Further, the inner peripheral surface of the housing is provided with a refrigerant dispersion surface arranged at an end of the branch groove, and the branch groove overlaps with the refrigerant dispersion surface in the axial direction.

Further, the refrigerant dispersion surface is formed to be inclined in a direction away from the main tank.

Further, the inner circumferential surface of the housing is provided with a refrigerant dispersion groove formed to be recessed and connected to an end of the branch groove.

Further, each of the refrigerant dispersion grooves is formed in a quarter-spherical shape open toward the branch groove and the shaft.

Further, the housing includes: a main housing, both sides of which are open; and a cover coupled to each side of the main housing, respectively.

Further, each cover is provided with a projection coupling portion projecting toward the main casing to engage with an inner peripheral surface of the open portion of the main casing, and the refrigerant dispersion surface is formed at an end of the projection coupling portion.

Further, the housing includes: a main housing, both sides of which are open; and a cover coupled to each side of the main housing, respectively. Each cover is provided with a protrusion coupling portion protruding toward the main casing to engage with an inner circumferential surface of the open portion of the main casing, and the refrigerant dispersion groove is formed at an end of the protrusion coupling portion.

Further, the outer circumferential surface of the housing is provided with a base portion formed to protrude outward and having a refrigerant storage space therein.

Further, a portion of the case facing the base is partially opened toward the refrigerant storage space, the refrigerant storage space and the receiving space communicate with each other, and the base is provided with a refrigerant discharge hole through which the refrigerant introduced into the refrigerant storage space is discharged.

Further, an axial length of the base is formed to be longer than the stator core, and a portion of the housing where the base is formed is provided with a through hole communicating the refrigerant storage space and the accommodation space.

Further, the through-hole is formed in a plurality of through-holes, and the plurality of through-holes are arranged on both sides of the main groove.

Further, the accommodating space includes: a first accommodation space disposed at one side of the stator core; and a second accommodation space disposed at the other side opposite to the one side of the stator core.

Further, the through-hole is formed as a plurality of through-holes. One of the through holes communicates the first accommodating space and the refrigerant storage space, and another of the through holes communicates the second accommodating space and the refrigerant storage space. And a bridge portion forming a part of the main groove is provided between the one of the plurality of through holes and the other of the plurality of through holes.

Further, a motor according to an embodiment of the present disclosure includes: a housing provided with an accommodation space therein and provided with a refrigerant supply hole formed through an outer circumferential surface thereof in a radial direction; a stator core disposed in the accommodation space and coupled to an inner circumferential surface of the housing; a stator coil wound around the stator core; a rotor core rotatably arranged and spaced apart from an inner circumferential surface of the stator core by a predetermined distance; and a shaft coupled through a central portion of the rotor core.

Further, a refrigerant supply flow path is formed between the inner peripheral surface of the housing and the stator core.

Further, the refrigerant supply flow path includes: a main flow path that communicates with the refrigerant supply hole and extends in a circumferential direction of the stator core; and branch flow paths extending in the axial direction on both sides of the main flow path and communicating with the main flow path.

Further, a refrigerant supply groove is recessed from a portion of an inner circumferential surface of the housing coupled to the stator core. The refrigerant supply tank includes: a main groove communicating with the refrigerant supply hole and extending in a circumferential direction of the stator core; and the branch grooves extend along the axial direction at two sides of the main groove and are communicated with the main groove.

Further, the main flow path is formed by the main groove and an inner peripheral surface of the housing facing the main groove, and the branch flow path is formed by the branch groove and an inner peripheral surface of the housing facing the branch groove.

According to one embodiment of the present disclosure, the following effects can be achieved.

First, in the housing, the stator core is coupled with an inner peripheral surface of the housing, and a circumferential flow path through which the refrigerant moves in a circumferential direction of the stator core is formed between the housing and the stator core.

Further, an axial flow passage that communicates with the circumferential flow passage and through which the refrigerant moves in the axial direction of the stator core is formed between the housing and the stator core.

Therefore, the refrigerant can be supplied to both end portions of the stator core in a balanced manner via the circumferential flow path and the axial flow path.

Thereby, both end portions of the stator core, which are one of the main heat sources of the motor, can be cooled evenly.

Therefore, an excessive increase in the internal temperature of the motor can be suppressed.

Further, the circumferential flow path and the axial flow path are formed in a space between the inner circumferential surface of the housing and the grooves formed on the outer circumferential surface of the stator core.

Therefore, the refrigerant can be uniformly supplied to both end portions of the stator core without a separate process for forming the flow path in the stator core or adding a separate component for distributing the refrigerant to the stator core.

Thereby, it is possible to uniformly supply the refrigerant to both end portions of the stator core without increasing the size of the stator core to form a flow path for supplying the refrigerant or adding a separate component.

As a result, the motor is miniaturized and the assembly process of the motor is simplified while the refrigerant is uniformly supplied to both end portions of the stator core, thereby reducing the manufacturing cost of the motor.

Further, a refrigerant dispersion structure that sprays refrigerant toward the center of the shaft is formed at each end of the axial flow path.

Accordingly, the refrigerant moving through the axial flow path may collide with the refrigerant dispersion structure to be sprayed toward the center of the shaft.

Thus, the refrigerant may be sprayed toward the crown portion and the end turns of the stator coil at both ends of the stator core.

Therefore, the area of the portion of the outer peripheral surfaces of the crown portion and the end turns which is in contact with the sprayed refrigerant can be increased.

As a result, heat exchange between the stator coil and the refrigerant can be performed more evenly.

Drawings

Fig. 1 is a perspective view of a motor according to an embodiment.

Fig. 2 is a perspective view showing the housing according to fig. 1 cut and exploded.

Fig. 3 is a perspective view illustrating the stator core according to fig. 1.

Fig. 4 is a sectional view showing the motor according to fig. 1 taken along the line IV-IV.

Fig. 5 is a sectional view showing the motor according to fig. 1 taken along the line V-V.

Fig. 6 is a partial perspective view illustrating another embodiment of the housing according to fig. 2.

Fig. 7 is an enlarged partial sectional view illustrating a region a of fig. 4.

Fig. 8 is a partial sectional view illustrating another embodiment of the motor according to fig. 7.

Fig. 9 is a partial sectional view illustrating still another embodiment of the motor according to fig. 7.

Detailed Description

Hereinafter, a motor according to embodiments disclosed herein will be described in detail with reference to the accompanying drawings.

Hereinafter, description of several components will be omitted in order to clear technical features of the present disclosure.

1. Definition of terms

The term "powered on" as used in the following description means that one component is electrically connected to another component or connected to enable communication of information. The energization may be carried out by means of wires, communication cables, or the like.

The term "front side" used in the following description refers to a direction toward the first cover 18, and the term "rear side" refers to a direction toward the second cover 19.

The term "upper side" used in the following description refers to a direction in which the refrigerant supply part 13 protrudes from the housing 10.

The term "lower side" used in the following description refers to a direction in which the base 15 is formed on the housing 10.

2. Description of motor 1 according to one embodiment of the present disclosure

Fig. 1 to 4 show a motor 1 that is rotated by receiving electric power from an external power source (not shown).

The motor 1 according to one embodiment of the present disclosure includes a housing 10, a stator 20, and a rotor 30.

In addition, although not shown, the motor 1 according to the present embodiment may include an external power source (not shown) and an inverter that converts the external power into three-phase power to drive the motor 1.

Next, each configuration of the motor 1 will be described in detail.

(1) Description of the housing 10

First, the housing 10 will be described with reference to fig. 1, 2, and 4. In fig. 2, the housing 10 is shown cut in half.

The housing 10 defines the appearance of the motor 1. Further, the housing 10 is provided with: a predetermined accommodation space V1 in which the stator 20 and the rotor 30 are accommodated; and a refrigerant storage space V2 formed in the casing, in which the refrigerant that exchanges heat is stored.

In the embodiment shown, the housing 10 comprises: a main housing 11 which is open at both sides; and a first cover 18 and a second cover 19 covering both open sides of the main housing 11 and coupled to the main housing 11.

However, the embodiment is not limited thereto, and in one embodiment, not shown, the main housing 11 may be implemented in a form in which only one side thereof is open. Here, the main housing 11 may be integrally formed with the first cover 18 or the second cover 19.

The main casing 11 includes a main body portion 12 formed in a cylindrical shape and a base portion 15 formed on a lower side of an outer peripheral surface of the main body portion 12.

The accommodation space V1 is formed by the inner peripheral surface of the main body 12 and the first and second covers 18 and 19 covering both sides of the main casing 11.

The base 15 may be formed in a square cylindrical shape having an open front side surface, an open rear side surface, and an open upper side surface. The open upper side of the base 15 is coupled to the outer circumferential surface of the main body 12.

The refrigerant storage space V2 is formed by the outer peripheral surface of the main body portion 12 and the first and second covers 18 and 19 covering both sides of the base portion 15.

The upper side of the outer circumferential surface of the main body 12 is provided with a refrigerant supply portion 13 protruding from the housing 10. The refrigerant supply portion 13 is provided with a refrigerant supply hole 13a formed through the case 10, which communicates the accommodation space V1 with the outside of the case 10.

The refrigerant supply portion 13 is connected to a refrigerant cycle portion (not shown) that supplies refrigerant to the inside of the case 10, and the refrigerant is introduced into the case 10 via the refrigerant supply hole 13 a.

The through hole 12a may be formed at a portion of the main body 12 facing the base 15. Therefore, the refrigerant introduced into the main body part 12 to cool the stator 20 and the rotor 30 may be introduced into the refrigerant storage space V2 via the passage 12 a.

One side surface of the base 15 is provided with a refrigerant discharge portion 16 protruding therefrom, and the refrigerant discharge portion 16 is provided with a refrigerant discharge hole 16a formed therethrough to communicate the refrigerant storage space V2 with the outside of the base 15. Therefore, the refrigerant introduced into the refrigerant storage space V2 may be discharged through the refrigerant discharge hole 16 a.

In an embodiment, not shown, the refrigerant discharge portion 16 may be connected to a refrigerant cycle portion (not shown). The refrigerant cooled during the circulation in the refrigerant circulation part (not shown) is introduced back into the accommodating space V1 via the refrigerant supply part 13.

A stator core 21 to be described later is coupled to an inner peripheral surface of the main body portion 12. In one embodiment, the stator core 21 may be press-fitted to the inner circumferential surface of the main body portion 12.

The accommodating space V1 includes a first accommodating space V11 located at the front side of the stator core 21 and a second accommodating space V12 located at the rear side of the stator core 21.

A plurality of through holes 12a for communicating the accommodating space V1 and the refrigerant storage space V2 are provided, and the plurality of through holes 12a may be formed at a position corresponding to the first accommodating space V11 and a position corresponding to the second accommodating space V12.

A bridge 14 is formed between the through-hole 12a formed at a position corresponding to the first accommodation space V11 and the through-hole 12a formed at a position corresponding to the second accommodation space V12.

The bridge 14 forms a portion of the primary slot 124. When the bridge portion 14 is formed, the main groove 124 may be cut around the stator core 21 in the circumferential direction of the stator core 21 without being cut in the middle.

Therefore, the refrigerant flowing through the main groove 124 is prevented from being directly introduced into the refrigerant storage space V2 via the through hole 12 a.

The refrigerant flowing through the main groove 124 is discharged into the first and second accommodation spaces V11 and V12 via the branch grooves 125 and 126 to cool the stator 20 and the rotor 30, and then introduced into the refrigerant storage space V2 via the through hole 12 a.

The refrigerant supply part 13 is formed at a position overlapping the stator core 21 in the radial direction, and a refrigerant supply flow path RF for supplying the refrigerant introduced through the refrigerant supply hole 13a to the first and second accommodation spaces V11 and V2 is formed between the inner circumferential surface of the main body part 12 and the outer circumferential surface of the stator core 21.

The refrigerant supply flow path RF includes a main flow path MF and a branch flow path BF.

The main flow passage MF extends in the circumferential direction of the stator core 21 and communicates with the refrigerant supply hole 13 a.

Therefore, the refrigerant introduced into the refrigerant supply hole 13a moves in the circumferential direction through the main flow path MF between the stator core 21 and the inner peripheral surface of the main body portion 12.

The branch flow paths BF extend in the axial direction from both sides of the main flow path MF.

Specifically, the branch flow paths BF are formed to extend from both sides of the main flow path MF to the front side and the rear side, respectively, and the branch flow paths BF may be formed in plural in the circumferential direction of the stator core 21. The plurality of branch flow paths BF are arranged to be spaced apart from each other by a predetermined distance in the circumferential direction.

The branch flow passage BF communicates with the main flow passage MF.

Therefore, the refrigerant flowing through the main flow path MF is introduced into the branch flow path BF, moves to the first and second accommodation spaces V11 and V12 via the branch flow path BF, and is then discharged.

An inner peripheral surface of the main body portion 12 facing the outer peripheral surface of the stator core 21 is provided with a refrigerant supply groove 123 in which a refrigerant supply flow path RF is concavely formed.

The refrigerant supply flow path RF is formed in a space between the refrigerant supply groove 123 and an outer circumferential surface of the stator core 21 facing the refrigerant supply groove 123.

The refrigerant supply groove 123 includes a main groove 124 and branch grooves 125 and 126.

The main slot 124 extends in the circumferential direction of the stator core 21, and is connected to the refrigerant supply hole 13 a.

The main flow passages MF are formed in spaces between the main slots 124 and the outer circumferential surfaces of the stator cores 21 that face the main slots 124.

The branch grooves 125 and 126 include a first branch groove 125 and a second branch groove 126.

The first branch groove 125 is connected to the front side of the main groove 124, and extends to the front side in the axial direction. The second branch groove 126 is connected to the rear side of the main groove 124 and extends to the rear side in the axial direction.

The branch flow path BF is formed in a space between the first and second branch grooves 125, 126 and the outer peripheral surface of the stator core 21 facing the first and second branch grooves 125, 126.

The main groove 124 has a predetermined width W1 in the axial direction. In addition, the first branch groove 125 and the second branch groove 126 have a predetermined length D1 in the axial direction.

A value W1+ D1+ D1 obtained by adding the value W1 of the axial width of the main slot 124 and the sum D1+ D1 of the axial lengths of the first branch slot 125 and the second branch slot 126 is larger than that of the axial length of the stator core 21.

The end of the first branch groove 125 faces the first accommodation space V11 instead of the outer circumferential surface of the stator core 21, and the end of the second branch groove 126 faces the second accommodation space V12 instead of the outer circumferential surface of the stator core 21.

Therefore, the refrigerant transferred through the branch flow path BF may be transferred from each end of the first and second branch grooves 125 and 126 and then discharged to the first and second accommodation spaces V11 and V12, respectively.

Both sides of the inner peripheral surface of the main body portion 12 are formed with first and second coupling grooves 121 and 122, and the stator core 21 is press-fitted to the first and second coupling grooves 121 and 122.

The first coupling groove 121 is formed to be recessed at the front side of the main body 12, and the second coupling groove 122 is formed to be recessed at the rear side of the main body 12.

The first coupling groove 121 is formed at the front side of the main body portion 12 in the circumferential direction to have a predetermined length in the axial direction. In addition, the second coupling groove 122 is formed at the rear side of the main body portion 12 in the circumferential direction to have a predetermined length in the axial direction. The predetermined length may be a length corresponding to the first protruding coupling portion 181 of the first cover 18 and the second protruding coupling portion 191 of the second cover 19, which will be described later, respectively.

The portion of the main body 12 where the first and second coupling grooves 121 and 122 are formed has a radial thickness thinner than the other portions.

The first cover 18 and the second cover 19 are formed to cover both open sides of the main casing 11. The first cover 18 and the second cover 19 are formed in a shape of a square coupled to the lower side of a circle.

However, the shape is not limited thereto, and in an embodiment not shown, the first cover 18 and the second cover 19 may be formed in various shapes having a size capable of covering both open sides of the main casing 11.

The first protrusion coupling portion 181 is formed to protrude from a rear side surface of the first cover 18 by a predetermined length. The predetermined length is equal to the axial length of the first coupling groove 121.

The first protruding coupling portion 181 is formed in a shape to be engaged with the first coupling groove 121 of the body portion 12. Accordingly, when the first protrusive coupling portion 181 is inserted into the open front side of the main body portion 12, the outer circumferential surface of the first protrusive coupling portion 181 and the first coupling groove 121 are engaged with each other. Accordingly, the first cover 18 and the front side of the main housing 11 may be coupled to each other.

The second protruding coupling part 191 is formed to protrude from the front side surface of the second cover 19 by a predetermined length. The predetermined length is equal to the axial length of the second coupling groove 122.

The second protruding coupling portion 191 is formed in a shape to be engaged with the second coupling groove 122 of the main body portion 12. Accordingly, when the second protrusive coupling portion 191 is inserted into the open rear side of the main body 12, the outer circumferential surface of the second protrusive coupling portion 191 and the second coupling groove 122 are engaged with each other. Accordingly, the second cover 19 and the rear side of the main housing 11 may be coupled to each other.

Although not shown, the first cover 18 and the front end of the main housing 11 may have a sealing portion (not shown) at a portion where the first cover 18 and the front end of the main housing 11 contact each other. In addition, the second cover 19 and the rear end of the main housing 11 may have a sealing portion (not shown) at a portion where the second cover 19 and the rear end of the main housing 11 contact each other. Therefore, it is possible to suppress leakage of the refrigerant via the portion where the first cover 18 and the main casing 11 are coupled to each other and the portion where the second cover 19 and the main casing 11 are coupled to each other.

The first cover 18 has a first bearing portion 182 and a first bearing hole 182a formed therein, and the second cover 19 has a second bearing portion 192 and a second bearing hole 192a formed therein.

A front side of the shaft 32, which will be described later, is received in the first bearing hole 182a, and a rear side of the shaft 32 is received in the second bearing hole 192 a.

As described above, the stator core 21 is coupled to the inner peripheral surface of the main body portion 12, and the stator coil 22 is wound on the stator core 21.

The stator core 21 and the stator coil 22 constitute the stator 20.

Hereinafter, the stator 20 and the rotor 30 will be described with reference to fig. 3 and 4.

(2) Description of the stator 20

A magnetic field that rotates a rotor 30, which will be described later, is formed in the stator 20.

The stator 20 includes a stator core 21 and a stator coil 22 wound on the stator core 21.

The stator core 21 includes: a yoke portion 211 formed in a ring shape; and a plurality of tooth portions 212 radially protruding from an inner circumferential surface of the yoke portion 211.

The stator core 21 is formed to extend a predetermined length in the axial direction.

In addition, the stator core 21 may be formed by stacking a plurality of electric sheets having a predetermined thickness in an axial direction in an insulating manner. Therefore, the occurrence of iron loss during operation of the motor 1 can be suppressed.

The tooth portions 212 are arranged spaced apart from each other in the circumferential direction within the yoke portion 211, and slits 213 as prescribed spaces are formed between the tooth portions 212 adjacent to each other in the circumferential direction.

That is, the slit 213 is formed in plural, and the plural tooth portions 212 and the plural slits 213 are alternately arranged in the circumferential direction.

The stator coil 22 may be wound on the plurality of teeth 212 and the plurality of slits 213 in a predetermined pattern.

The stator coil 22 includes a conductor and an insulating coating surrounding the conductor. As the stator coil 22, a conductor segment formed by bending a straight-angled copper wire (refer to fig. 5) having a relatively large cross-sectional area into an approximately "U" shape or a hairpin magnet wire (hereinafter referred to as "hairpin") is used.

The stator coils 22 are electrically connected by inserting the stator coils 22 into the plurality of slits 213 in a predetermined pattern in one direction and then welding the end portions of the stator coils 22 protruding toward one side of the stator core 21 in the predetermined pattern.

Therefore, one side of the stator core 21 is formed with an end turn portion where the bent portion of the stator coil 22 is located, and the other side of the stator core 21 is formed with a crown portion that electrically couples the ends of the stator coil 22.

When the motor 1 is operated, the heat generated at the end turn portions and the crown portion is relatively more than other portions. Therefore, it is preferable to evenly spray the refrigerant to both sides of the stator core 21 where the end turn portions and the crown portions are formed.

In one embodiment, a stranded wire may be used as the stator coil 22. Here, the stator coil 22 passes through the plurality of slits 213 in the axial direction and is wound on the plurality of teeth 212 in a predetermined pattern.

In an embodiment not shown, the stator coil 22 is electrically connected to an inverter (not shown). And, an inverter (not shown) converts power applied from an external power source into alternating current power for operating the motor 1, and then supplies the alternating current power to the stator coil 22.

When a current is applied from an inverter (not shown) to the stator coil 22, a magnetic field is formed around the stator coil 22. That is, a rotating magnetic field for rotating the rotor 30 is formed in the stator 20.

A rotor accommodating hole 21a is formed through a radially inner side of the plurality of teeth 212, and the rotor 30 is rotatably disposed in the rotor accommodating hole 21 a.

The rotor 30 is rotated by interaction with the rotating magnetic field of the stator 20.

(3) Description of the rotor 30

The rotor 30 includes a rotor core 31 and a shaft 32.

The rotor core 31 is formed to extend a predetermined length in the axial direction.

The rotor core 31 may be formed in the shape of an annular column, and a shaft receiving hole 31a is formed in a central portion of the rotor core 31 to pass therethrough.

In addition, the rotor core 31 may be formed by stacking a plurality of electric sheets having a predetermined thickness in an axial direction in an insulating manner. Therefore, the occurrence of iron loss during operation of the motor 1 can be suppressed.

In an embodiment not shown, rotor core 31 may include permanent magnets (not shown). In this case, the rotating magnetic field of the stator 20 and the magnetic field of the permanent magnet (not shown) interact with each other. Accordingly, the rotor 30 may rotate relative to the stator 20.

The shaft 32 is inserted into the shaft receiving hole 31 a. In one embodiment, the shaft receiving hole 31a and the shaft 32 may be coupled to each other in a press-fit manner.

The shaft 32 protrudes in the axial direction to both sides of the rotor core 31, the front side of the shaft 32 is received in the first bearing hole 182a, and the rear side of the shaft 32 is received in the second bearing hole 192 a.

That is, electric energy is supplied to the stator 20, and the electric energy is converted into mechanical rotational energy by interaction of a magnetic field formed in the stator 20 and a magnetic field formed in the rotor 30.

Hereinafter, a refrigerant cycle process by the main flow path MF and the branch flow path BF will be described with reference to fig. 4 and 5.

(4) Description of the refrigerant cycle Process

The refrigerant introduced through the refrigerant supply hole 13a is introduced into the main flow path MF, moves through the main flow path MF, is introduced into the branch flow path BF, and is then discharged into the first and second accommodation spaces V11 and V12.

The refrigerant is discharged into the first accommodating space V11 through the branch flow passage BF formed in the axial direction on the front side of the main flow passage MF, and is discharged into the second accommodating space V12 through the branch flow passage BF formed in the axial direction on the rear side of the main flow passage MF.

Referring to fig. 4, in a state where the stator core 21 is press-fitted, branch flow paths BF are formed between the outer peripheral surface of the stator core 21 and the first branch grooves 125 and between the outer peripheral surface and the second branch grooves 126.

The refrigerant discharged to the first accommodation space V11 via the branch flow path BF is sprayed on the front side of the stator 20 and the rotor core 31.

The refrigerant sprayed on the front sides of the stator 20 and the rotor core 31 exchanges heat with the stator 20 and the rotor core 31. Heat energy is transferred from the relatively higher temperature stator 20 and rotor core 31 to the lower temperature refrigerant.

Further, the refrigerant discharged to the second accommodation space V12 via the branched flow path BF is sprayed on the rear side of the stator 20 and the rotor core 31.

The refrigerant sprayed at the rear side of the stator 20 and the rotor core 31 exchanges heat with the stator 20 and the rotor core 31. Heat energy is transferred from the stator 20 and the rotor core 31 having relatively high temperatures to the refrigerant having a lower temperature.

Therefore, the stator 20 and the rotor core 31 heated at the time of the operation of the motor 1 can be cooled.

The bent or electrically coupled portions of the stator coils 22 may be formed to protrude at the front and rear ends of the stator 20.

In one embodiment, when a straight-angled copper wire is used as the stator coil 22, end turn portions at which the stator coil 22 is bent may be formed at the front end portion and the rear end portion of the stator 20, and a crown portion that electrically connects the stator coil 22 may be formed at the rear end portion of the stator core 21.

In one embodiment, when a stranded wire is used as the stator coil 22, portions of the stator coil 22 bent and wound on the teeth portions 212 may be formed at the front and rear end portions of the stator 20.

When the motor 1 operates, the portions of the stator coils 22 that are bent or electrically coupled may generate relatively more heat energy than other portions. That is, the portion where the stator coil 22 is bent or electrically coupled is one of the main heat sources of the motor 1.

The refrigerant discharged into the first accommodation space V11 may be sprayed onto the stator coil 22 protruding from the front end portion of the stator core 21. In addition, the refrigerant discharged into the second accommodation space V12 may be sprayed onto the stator coil 22 protruding from the rear end portion of the stator core 21.

Therefore, it is possible to cool the portion where the stator coil 22 is bent or electrically coupled, which is one of the main heat sources of the motor 1.

Referring to fig. 5, the refrigerant flowing through the main flow path MF is distributed to the branch flow path BF.

A main flow passage MF is formed between the outer peripheral surface of the stator core 21 and the main grooves 124 in a state where the stator core 21 is press-fitted.

The main flow passage MF surrounds the stator core 21 in the circumferential direction of the stator core 21.

The plurality of branch flow paths BF are arranged so as to be spaced apart from each other in the circumferential direction of the stator core 21, and each branch flow path BF is electrically connected to the main flow path MF.

Therefore, the refrigerant flowing through the main flow path MF can flow into each branch flow path BF.

Since the plurality of branch flow paths BF are arranged to be spaced apart from each other in the circumferential direction, it is possible to suppress an excessive amount of refrigerant from being supplied to a specific portion of the stator 20 and the rotor core 31, and thus the amount of refrigerant sprayed to another specific portion is insufficient.

That is, each end of the stator 20 and the rotor core 31 can be uniformly cooled in the circumferential direction.

The refrigerant discharged to the first and second accommodation spaces V11 and V12 via the branch flow path BF cools the stator 20 and the rotor 30, and is then introduced into the refrigerant storage space V2 via the through hole 12 a.

The refrigerant introduced into the refrigerant storage space V2 is discharged to the outside of the motor 1 through the refrigerant discharge hole 16a, and then cooled again in the process of flowing through the refrigerant circulating part (not shown) to be introduced into the main flow path MF through the refrigerant supply hole 13 a.

3. Description of effects of the structure in which the refrigerant supply groove 123 is formed on the inner circumferential surface of the case 10

A main groove 124 forming the main flow path MF and branch grooves 125 and 126 forming the branch flow path BF are recessed in the inner peripheral surface of the housing.

Therefore, the refrigerant can be uniformly supplied to both end portions of the stator core 21 without separately processing the stator core 21 to form the flow path in the stator core 21 or adding a separate component for distributing the refrigerant to the stator core 21.

When the flow path is formed in the stator core 21, the magnetic path area is reduced, so that the output of the motor 1 may be adversely affected, and the size of the stator core 21 may be increased.

In addition, when a separate component for distributing refrigerant is added to the stator core 21, costs for producing the separate component may be increased, and an assembly process of the motor 1 may be complicated. That is, the cost for producing the motor 1 may be increased.

Since the refrigerant supply groove 123 is formed on the inner circumferential surface of the housing 10, the refrigerant can be uniformly supplied to both end portions of the stator core 21 without reducing the magnetic path area of the stator core 21, increasing the size or increasing the manufacturing cost.

In other words, the motor 1 is miniaturized and the assembly process of the motor 1 is simplified while the refrigerant is uniformly supplied to both end portions of the stator core 21, so that the manufacturing cost of the motor can be reduced.

4. Description of a variant embodiment of the main flow-path MF

Hereinafter, a modified embodiment of the main flow path MF will be described with reference to fig. 6.

Portions of the main groove 124 where the branch grooves 125 and 126 adjacent to each other are connected in the circumferential direction are provided with a bottle neck portion 124a having a narrow width.

The bottleneck portion 124a may be defined as a space between bottleneck protrusions 1241 protruding from both side surfaces of the main groove 124 facing each other.

The axial width W2 between the bottleneck projections 1241 is formed narrower than the axial width W1 of the main groove 124.

In the illustrated embodiment, the bottleneck protrusion 1241 protrudes in a square cylindrical shape.

However, the shape is not limited thereto, and in an embodiment not shown, the bottleneck protrusion 1241 may be formed in various shapes. For example, the bottleneck protrusion 1241 may be formed to protrude toward each other from both side surfaces of the main slot 124 facing each other.

Since the cross-sectional area of the flow path is immediately reduced while the refrigerant flowing through the main flow path MF flows into the bottle neck portion 124a, the pressure of the refrigerant can be instantaneously increased.

Since the pressure difference between the main flow passage MF and the branch flow passage BF is immediately increased, the refrigerant can be more uniformly introduced into the branch flow passage BF from the main flow passage MF.

That is, without increasing the pressure of the refrigerant introduced through the refrigerant supply hole 13a, the flow rate of the refrigerant discharged through the branch flow path BF can be increased with a simple structural change.

As a result, the refrigerant can be more uniformly discharged into the first and second accommodating spaces V11 and V12.

5. Description of the structure for spraying the refrigerant toward the shaft 32

Next, with reference to fig. 7 to 9, a structure in which the refrigerant having passed through the branch flow path BF is sprayed to the center of the shaft 32 will be described.

Referring to fig. 7, a refrigerant dispersion surface 181a is formed on an inner circumferential surface of the housing 10, and the refrigerant dispersion surface 181a is disposed at ends of the branch grooves 125 and 126.

The refrigerant dispersion surface 181a is formed in plurality and arranged at each end of the plurality of branch grooves 125 and 126. That is, the plurality of refrigerant dispersion surfaces 181a are arranged to be spaced apart from each other in the circumferential direction of the stator core 21.

The refrigerant moving through the branch flow path BF collides with each refrigerant dispersion surface 181a and then is sprayed toward the stator coils 22 protruding from both end portions of the stator core 21.

The refrigerant dispersion surface 181a is formed to be inclined in a direction intersecting the axial direction. In one embodiment, the refrigerant dispersion surface 181a may be formed perpendicular to the axial direction.

As a result, the refrigerant colliding with the refrigerant dispersion surface 181a may be sprayed toward the shaft 32.

Since the refrigerant discharged from the branch flow path BF located on the lower side of the motor 1 (based on the mounting direction of the motor 1) is affected by gravity, the amount of refrigerant reaching the stator coil 22 located on the upper side of the motor 1 decreases. Therefore, the efficiency of cooling the stator coil 22 located on the lower side of the motor 1 may be reduced.

However, since the refrigerant dispersion surface 181a is formed to be inclined in a direction crossing the axial direction, the refrigerant colliding with the refrigerant dispersion surface 181a may be sprayed upward toward the center of the shaft 32. Therefore, the refrigerant can be sufficiently sprayed to the stator coil 22 located on the lower side.

As a result, the stator coils 22 on the upper and lower sides can be uniformly cooled.

In the illustrated embodiment, the refrigerant dispersion surface 181a is formed at an end of the first and second protruding coupling portions 181 and 191.

When the first cover 18 is inserted into the open front side of the main housing 11, the rear end surface of the first protrusion coupling portion 181 is arranged to face the end of the first branch groove 125.

As a result, the refrigerant moving through the first branch groove 125 collides with the rear end surface of the first protrusion coupling portion 181. That is, the refrigerant collides with the refrigerant dispersion surface 181a formed at the end of the first projection coupling portion 181 to be sprayed toward the center of the shaft 32.

When the second cover 19 is inserted into the open rear side of the main housing 11, the front end surface of the second protruding coupling portion 191 is arranged to face the end of the second branch groove 126.

As a result, the refrigerant moving through the second branch groove 126 collides with the front end surface of the second protrusive coupling portion 191. That is, the refrigerant collides with a refrigerant dispersion surface (not shown) formed at an end of the second protrusive coupling portion 191 to be sprayed toward the center of the shaft 32.

In order to improve the dispersion effect of the refrigerant, the first and second protruding coupling portions 181 and 191 may be formed to protrude radially inward from a portion of the case 10 where the refrigerant supply groove 123 is formed. That is, in the coupled state, there is a step difference between the first and second protruding coupling portions 181 and 191 and the main casing 11.

Referring to fig. 8, a modified embodiment of the refrigerant dispersion surface 181a is shown. The refrigerant dispersion surface 1810a according to a modified embodiment may be formed to be inclined in a direction away from the main groove 124.

The inclined refrigerant dispersion surface 1810a may be formed by chamfering an angle of an inner circumference forming an end of the first projection coupling portion 181 in a circumferential direction.

Further, a refrigerant dispersion surface (not shown) may be formed by chamfering an angle of an inner circumference forming an end of the second protrusive coupling portion 191 in a circumferential direction.

Accordingly, the inclined refrigerant dispersion surface 1810a may be disposed at the end portions of the first and second protrusion coupling portions 181 and 191 facing each end portion of the branch grooves 125 and 126.

The refrigerant moving through the branch grooves 125 and 126 moves through the inclined refrigerant dispersion surface 1810a to be sprayed toward the center of the shaft 32.

Thereby, the refrigerant can be sprayed farther from each end of the stator core 21.

Specifically, the refrigerant may be sprayed farther from the front end portion of the stator core 21, and the refrigerant may be sprayed farther from the rear end portion of the stator core 21.

The length of the stator coil 22 protruding from each end of the stator core 21 may be changed according to the type of the stator coil 22 or the winding method.

In the case where the protruding length of the stator coil 22 is relatively long, the refrigerant may reach a position farther in the axial direction as the inclination of the refrigerant dispersion surface 181a is formed more smoothly. Therefore, the refrigerant can be sprayed over the entire stator coil 22.

When the protruding length of the stator coil 22 is relatively short, it is preferable to form the slope of the refrigerant dispersion surface 181a to be steeper or vertical.

Referring to fig. 9, another modified embodiment of the refrigerant dispersion surface 181a is shown. The end of the first protruding coupling portion 181 according to another modified embodiment may be provided with refrigerant dispersion grooves 1810b each formed as a recess.

The refrigerant dispersion groove 1810b is formed at a position corresponding to each end of the first branch groove 125.

The refrigerant dispersion grooves 1810b may be formed in a quarter-spherical shape, and each refrigerant dispersion groove 1810b is open toward the first branch groove 125 and the shaft 32.

Accordingly, the refrigerant moving through the first branch groove 125 may move through the curved surface of the refrigerant dispersion groove 1810b to be intensively sprayed toward the center of the shaft 32.

That is, the refrigerant may be sprayed intensively to a specific portion, rather than being sprayed over a larger area.

When the stator coils 22 protruding toward the front side of the stator core 21 are densely arranged at a specific portion, the cooling effect can be improved by intensively spraying the refrigerant to the specific portion.

Further, the end of the second protruding coupling portion 191 according to another modified embodiment may be provided with refrigerant dispersion grooves (not shown) each formed to be concave.

A refrigerant dispersion groove (not shown) is formed at a position corresponding to each end of the second branch groove 126.

The refrigerant dispersion grooves (not shown) may be formed in a quarter-spherical shape, each of which is open toward the second branch groove 126 and the shaft 32.

Accordingly, the refrigerant moving through the second branch groove 126 may move through the curved surface of the refrigerant dispersion groove (not shown) to be intensively sprayed toward the center of the shaft 32.

That is, the refrigerant may be densely sprayed to a specific portion, rather than being sprayed over a larger area.

When the stator coils 22 protruding toward the rear side of the stator core 21 are densely arranged at a specific portion, the cooling effect can be improved by intensively spraying the refrigerant to the specific portion.

The above description has been given as three embodiments of the structure for spraying the refrigerant toward the center of the shaft 32. In one embodiment, the refrigerant dispersing surfaces 181a and 1810a and the refrigerant dispersing groove 1810b may be used in combination.

For example, the refrigerant dispersion surfaces 181a and 1810a may be formed at an upper side and the refrigerant dispersion groove 1810b may be formed at a lower side, based on the installation direction of the motor 1. By forming the refrigerant dispersion groove 1810b at the lower side, the distance of spraying the refrigerant upward from the lower side can be increased.

Therefore, the refrigerant can be sprayed to a wider range on the upper side, and the refrigerant can smoothly reach the stator coil 22 on the lower side.

Summarizing the above effects, the refrigerant moving through the axial flow path may collide with the refrigerant dispersion structure to be sprayed toward the center of the shaft 32.

Therefore, the refrigerant can be sprayed toward the crown portions and the end turns of the stator coils 22 located at both ends of the stator core 21.

Therefore, the area of the portion of the outer peripheral surfaces of the crown portion and the end turns which is in contact with the sprayed refrigerant can be increased.

As a result, heat exchange between the stator coil 22 and the refrigerant can be performed more evenly.

While the foregoing description has been given with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made to the disclosure without departing from the scope of the disclosure as described in the following claims.