阅读说明：本技术 旋转电机的定子 (Stator of rotating electric machine ) 是由 土屋侑生 竹原明秀 于 2019-07-02 设计创作，主要内容包括：提供一种旋转电机的定子,在旋转电机的定子的导线的卷绕中使用的、具有在从定子突出的导线的端部处的相邻导线的电连接的结合部及进行向外部的输出的多个导线的所述结合部中,即使施加过大的振动也能够抑制所述结合部的损伤。在旋转电机的定子(10)中包括：配置成包围结合部(26)并由侧壁(38)和底壁(40)构成的帽形状的容器部(34)；填充于结合部(26)与容器部(34)间的空间的粘接剂(46)；及接收从容器部(46)溢出的粘接剂(46)的接收部(36)。由此,即使在施加过大的振动应力,尤其是施加向将接合的两个导线(28)相对于结合部(26)打开的方向的振动的情况下,也能抑制因这种振动应力产生的损伤。(Provided is a stator of a rotating electrical machine, wherein damage to a joint portion, which is used for winding a lead wire of the stator of the rotating electrical machine and has a joint portion for electrically connecting adjacent lead wires at an end portion of a lead wire protruding from the stator and a plurality of lead wires for outputting to the outside, can be suppressed even if excessive vibration is applied. A stator (10) of a rotating electric machine includes: a cap-shaped container part (34) which is configured to surround the connection part (26) and is composed of a side wall (38) and a bottom wall (40); an adhesive (46) filled in a space between the coupling part (26) and the container part (34); and a receiving portion (36) for receiving the adhesive (46) that overflows from the container portion (46). Thus, even when an excessive vibration stress is applied, particularly, when vibration is applied in a direction in which the two wires (28) to be bonded are opened with respect to the joint (26), damage due to the vibration stress can be suppressed.)

1. A stator of a rotating electrical machine comprising a stator core, a plurality of lead wires wound around the stator core and forming power lines, and a plurality of joining portions where the plurality of lead wires are electrically joined, the stator of the rotating electrical machine being characterized in that,

the adhesive container includes a protective case integrally having a container portion, an adhesive, and a receiving portion, the container portion being formed of a side wall and a bottom wall and respectively accommodating the plurality of bonding portions, the adhesive being filled in the container portion and fixing the bonding portions accommodated in the container portion, the receiving portion receiving the adhesive in an uncured state which overflows from the container portion.

2. The stator of a rotating electric machine according to claim 1,

a plurality of grooves are formed at a plurality of positions in the circumferential direction on the inner circumferential surface of the side wall constituting the container portion.

3. The stator of a rotating electric machine according to claim 1 or 2,

the plurality of container portions are formed integrally with the receiving portion.

4. The stator of a rotating electric machine according to any one of claims 1 to 3,

the adhesive is a resin material.

5. The stator of a rotating electric machine according to any one of claims 1 to 3,

the adhesive is a conductive material.

6. The stator of a rotating electric machine according to any one of claims 1 to 3,

the bottom wall of the container portion has an opening through which the coupling portion is inserted.

Technical Field

The present invention relates to a stator of a rotating electric machine having an electrical connection portion of a plurality of wires wound around a stator core of the rotating electric machine.

Background

A method of winding a wire around a stator core of a rotating electric machine is known. For example, in patent document 1, a plurality of insulated wires inserted into a plurality of recesses formed in an inner circumferential surface of a stator core are electrically joined to each other by welding at end portions of the wires protruding from the stator core, whereby the stator core is wound with the wires. Thereby, a stator having a three-phase structure of U-phase, V-phase, and W-phase is constructed.

Disclosure of Invention

Problems to be solved by the invention

In the method of winding the lead wire used in the stator of the rotating electric machine of patent document 1, that is, the method of electrically joining the end portions of the plurality of adjacent lead wires protruding from the stator core by welding, the lead wire can be easily wound around the stator core, and the lead wire protruding from the stator core can be reduced in size. However, when an excessive vibration stress acts on the lead wires, particularly when vibration in a direction in which two lead wires joined together open to the joint is applied to the joint between the lead wires to weld the plurality of lead wires protruding from the stator core, there is a possibility that damage may occur to the joint.

The present invention has been made in view of the above circumstances, and an object of the present invention is to effectively suppress damage to a joint portion that electrically connects a plurality of lead wires used in a stator of a rotating electrical machine even when an excessive vibration stress is applied to the joint portion.

Means for solving the problems

A first aspect of the present invention is a stator of a rotating electrical machine, the stator (a) including a stator core, a plurality of lead wires wound around the stator core and forming a power line, and a plurality of coupling portions to which the plurality of lead wires are electrically coupled, the stator being characterized in that the stator (b) includes a protective case integrally including a container portion, an adhesive, and a receiving portion, the container portion being formed of a side wall and a bottom wall and respectively accommodating the plurality of coupling portions, the adhesive being filled in the container portion and fixing the coupling portions accommodated in the container portion, the receiving portion receiving the adhesive in an uncured state that has overflowed from the container portion.

A second aspect of the present invention is the stator of the rotating electric machine according to the first aspect of the present invention, wherein a plurality of grooves are formed at a plurality of positions in a circumferential direction on an inner circumferential surface of a side wall that forms the container portion.

A third aspect of the invention is the stator of a rotating electric machine according to the first or second aspect of the invention, wherein the plurality of container portions are formed integrally with the receiving portion.

A fourth aspect of the invention is the stator of a rotating electric machine according to any one of the first to third aspects of the invention, wherein the adhesive is a resin material.

A fifth aspect of the invention is the stator of a rotating electric machine according to any one of the first to third aspects of the invention, wherein the adhesive is a conductive material.

A sixth aspect of the invention provides the stator of a rotating electric machine according to any one of the first to third aspects of the invention, wherein an opening through which the coupling portion is inserted is provided in a bottom wall of the container portion.

Effects of the invention

According to the first aspect of the invention, the stator of the rotating electrical machine includes the stator core, the plurality of lead wires wound around the stator core and forming the power line, and the plurality of coupling portions to which the plurality of lead wires are electrically coupled, and the stator of the rotating electrical machine includes the protective case integrally having the container portion, the adhesive, and the receiving portion, the container portion being configured by the side wall and the bottom wall and respectively accommodating the plurality of coupling portions, the adhesive being filled in the container portion and fixing the coupling portions accommodated in the container portion, and the receiving portion receiving the adhesive in an uncured state that has overflowed from the container portion. Thus, by filling the space between the bonding portion of the lead wires and the container portion with the adhesive, even when an excessive vibration stress is applied, particularly, when vibration in a direction in which the two lead wires to be bonded are opened with respect to the bonding portion is applied, damage due to such a vibration stress can be suppressed. In the case where the adhesive is filled so as to overflow from the container portion arranged so as to surround the joint portion, the adhesive flows out to the receiving portion formed around the container portion, so that the height of the adhesive covering the joint portion is kept uniform. This makes it possible to uniformly suppress vibration by the adhesive.

According to the second aspect of the invention, a plurality of grooves are formed at a plurality of positions in the circumferential direction on the inner circumferential surface of the side wall constituting the container portion. Thereby, the adhesive is inhibited from being detached from the container portion.

According to the third invention, the plurality of container portions are formed integrally with the receiving portion. This can reduce the number of components.

According to the fourth invention, the adhesive is a resin material. This can suppress damage in the joint portion due to excessive stress, and can further improve insulation between the adjacent joint portion and the joint portion.

According to the fifth invention, the adhesive is a conductive material. This can suppress damage in the joint portion due to excessive stress, and can improve the conductivity in the joint portion.

According to the sixth aspect of the invention, the bottom wall of the container portion has an opening through which the coupling portion is inserted. Accordingly, when the stator core is installed in a vehicle, the joint portion is located above the stator core, and the bottom wall of the container portion is not inserted into the opening of the joint portion, the stator core needs to be inverted to suppress leakage of the adhesive from the container portion, the container portion is assembled to the joint portion, and the stator core needs to be inverted again after the adhesive is cured to increase its viscosity to be installed in the vehicle. Since the bottom wall of the container portion has an opening, the stator core does not need to be turned over, and the container portion is easily assembled.

Drawings

Fig. 1 is a perspective view illustrating a schematic structure of a stator of a rotating electric machine to which the present invention is applied.

Fig. 2 is a cross-sectional view schematically showing the structure of the container portion and the receiving portion of the protective case of fig. 1.

Fig. 3 is a cross-sectional view schematically illustrating the function of the receiving portion in a case where the adhesive is contained in the container portion of the protective case of fig. 2, the coupling portion of the lead is inserted into the container portion, and the adhesive overflows over the sidewall of the container portion.

Fig. 4 is a perspective view showing an example of mutual arrangement between a connection portion of a lead wire and a protective case for holding the connection portion with an adhesive in the stator of the rotating electrical machine of fig. 1.

Fig. 5 is an enlarged view of a groove formed on the inner peripheral side of the side wall of the container portion in fig. 2 and 3.

Fig. 6 is a diagram showing an example of a groove formed in the inner periphery of a container portion of a protective case having a plurality of container portions.

Fig. 7 is a schematic view showing a case where the stator is installed in the vehicle at a position where the bottom wall of the container portion is located above the coupling portion after the coupling portion of fig. 3 is housed in the container portion.

Fig. 8 is a schematic view showing a case where a protective case in which an opening through which the coupling portion is inserted is formed in the bottom of the container portion is used.

Description of the reference symbols

10: stator (stator of rotating electrical machine)

12: stator core

24: power line

26: joining part

28: conducting wire

30. 31: protective shell

34: container part

36: receiving part

38: side wall

40: bottom wall

46: adhesive agent

48: trough

50: bottom wall opening (opening)

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, the drawings are simplified or modified as appropriate, and the dimensional ratios, shapes, and the like of the respective portions are not necessarily drawn accurately.

[ example 1 ]

The stator 10 of the rotating electrical machine shown in fig. 1 includes, for example, a cylindrical stator core 12 formed of an electromagnetic steel plate, and a lead wire 28 formed of a stator coil 18, a power line 24, a bus bar 22 shown in fig. 3 and 4, and the like. A plurality of slots (slots) 14, which are deep in the direction toward the outer circumferential side and penetrate in the width direction, are formed in the inner circumferential surface of the cylindrical stator core 12, and a stator coil 18 is wound around teeth (teeth)16 formed between adjacent slots 14 to form a winding. The stator coil 18 is a lead wire 28 made of a conductor of, for example, copper or a copper alloy, which is covered with an insulating coating, and the stator coil 18 is inserted into the slot 14 of the stator core 12, and is electrically joined by, for example, TIG (Tungsten Inert Gas) welding at the coil end 20, which is the end of the stator coil 18 protruding from the slot 14 to the outside of the stator core 12. The stator core 12 is not necessarily an electromagnetic steel plate, and may be a core formed by molding powder, solid, or the like of a magnetic material, for example.

The stator coils 18 wound around the teeth 16 form a three-phase winding including U, V, and W phases, and ends of the respective stator coils 18 are electrically connected to lead wires called bus bars 22 shown in fig. 3, and the bus bars 22 are further electrically connected to power wires 24. Fig. 1 shows three power lines 24, and an external terminal 32 for connection to an inverter or the like, not shown, is attached to a tip end of each power line 24. These stator coils 18, bus bars 24, and power wires 24 constitute lead wires 28 of the stator core 12. Coupling portions 26 shown in fig. 3 as the electrical coupling portions of bus bars 22 and power lines 24 and the electrical coupling portions of multiple bus bars 22 are disposed inside protective cases 30 and 31.

Fig. 2 schematically shows a state where an adhesive 46 is filled in the container portion 34 of the protective cases 30, 31, wherein the adhesive 46 is used for reinforcing the joint strength of the joint portion 26 electrically joining the bus bar 22 and the power line 24 shown in fig. 3 together, for example, by welding. In order to suppress vibration of the bus bar 22 and the power wire 24 in the opening direction with respect to the joint 26, the adhesive 46 is made of a resin material such as silicone resin or epoxy resin, for example, whose viscosity increases with heating, passage of time, or irradiation of ultraviolet rays when filled. The protective cases 30, 31 are constituted by a cap-shaped container portion 34 and a receiving portion 36, the container portion 34 is constituted by a bottom wall 40 and a side wall 38, and the receiving portion 36 is constituted by a bottom wall 42 and an outer peripheral portion 52, and is formed so as to surround at least a part of the outer periphery of the container portion 34. The bottom wall 40 of the container portion 34 and the bottom wall 42 of the receiving portion 36 are integrally formed with each other and have the same thickness and plane.

Fig. 3 schematically shows a state in which the bonding portion 26 in which the bus bar 22 and the power line 24 are bonded together by welding is housed in the adhesive 46 shown in fig. 2. The upper blank arrow indicates a moving direction from above to below of the coupling portion 26 in order to insert the coupling portion 26 into the container portion 34. The arrows shown by the curved lines indicate a state in which the excess uncured adhesive 46 in the container portion 34 flows out of the container portion 34 into the receiving portion 36 due to the accommodation of the coupling portion 26. The joint 26 of the bus bar 22 and the power wire 24 is housed in the container portion 34 formed in the protective cases 30, 31, and the space between the container portion 34 and the joint 26 is filled with the adhesive 46, whereby the joint 26 is fixed to the inside of the container portion 34 of the protective cases 30, 31, and the joint strength of the joint 26 is enhanced. In addition, when adhesive 46 having fluidity at the uncured stage passes over side wall 38, it flows out from inside container portion 34 to receiving portion 36, so that the height of adhesive 46 in container portion 34 is kept uniform.

Fig. 4 is an enlarged view showing an example of the protective case 30. The protective case 30 is configured by four container portions 34 that house the coupling portions 26 and a receiving portion 36 provided between the adjacent container portions 34 and 34 that houses the adhesive 46 that overflows from the container portions as shown in fig. 3, and the plurality of container portions 34 and the plurality of receiving portions 36 are formed integrally. Outer peripheral portion 52 of protective housing 30 forms a portion of sidewall 38 of container portion 34 and forms a portion of the sidewall of receptacle portion 36. Sidewall 38 of container portion 34, which is defined by container portion 34 and receiving portion 36, is set lower than outer peripheral portion 52 so that adhesive 46 that has overflowed from container portion 34 is transferred to receiving portion 36. The bottom wall 40 of the container portion 34 and the bottom wall 42 of the receiving portion 36 are formed as one body and have the same thickness and plane. Hereinafter, the bottom wall 40 is referred to as "bottom wall" unless otherwise specified. It should be noted that the bottom wall 40 of the container portion and the bottom wall 42 of the receiving portion 36 may be formed to have different thicknesses and different planes, that is, a stepped structure, instead of the same thickness and the same plane. The protective case 30 is mainly made of an insulating material such as an organic material such as resin or rubber, or an inorganic material such as ceramic or glass. Two joints 26 where the power wires 24 are joined to the bus bars 22 and two joints 26 where two bus bars 22 are joined are shown. These coupling portions 26 are housed inside the container portion 34 formed by the outer peripheral portion 52 of the protective case 30, the side walls 38, and the bottom wall 40, respectively.

Fig. 5 shows a container part 34 formed by a cylindrical side wall 38 and a bottom wall 40. A plurality of linear grooves 48 are formed in the inner peripheral surface of the side wall 38 by serration. The serration is used to enhance the adhesion of the adhesive 46 filled in the container portion 34 to the container portion 38. The groove 48 may be formed not only on the inner peripheral surface of the side wall 38 of the container portion 34 but also on the inner surface of the bottom wall 40. The groove formed in the inner peripheral surface of the side wall 38 is shown by a rectangular cross section, but may have a V-shaped or U-shaped cross section, for example, instead of being particularly rectangular. Instead of the groove 48, at least the inner surface of the side wall 38 or the bottom wall 40 of the container portion may be processed to increase the surface area, for example, the inner surface of the container portion 34 may be processed to have irregularities.

Fig. 6 shows an example of the structure of the protective case 31 of another example having three container portions 34 in one direction. The protective case 31 is configured by three container portions 34 that house the coupling portions 26 and a receiving portion 36 that is provided between the adjacent container portions 34 and that houses the uncured adhesive 46 that overflows from the container portions 34, and the plurality of container portions 34 and the plurality of receiving portions 36 are formed integrally. The outer peripheral portion 52 of the protective case 31 forms a part of the side wall 38 of the container portion 34 and a part of the side wall of the receiving portion 36. A part of outer peripheral portion 52 has a notch 54 whose height is lower than other outer peripheral portions 52, and the height of notch 54 is substantially the same as the height of side wall 38 of container portion 34 in contact with receiving portion 36. In addition, a receiving portion 36 is provided between the outer peripheral portion 52 of the lower portion of the cutout 54 and the side wall 38. A coupling portion 56 for coupling adjacent container portions 34 to each other is provided at a substantially center of protective case 31 in the width direction, and has a function of suppressing vibration of container portion 56 generated when vibration is applied to coupling portion 26. The grooves 48 formed in the inner circumferential surface of the side wall 38 and the outer circumferential portion 52 surrounding the container portion 34 are continuous to the end portion on the opening side of the protective case 31.

According to the present embodiment, the stator 10 of the rotating electrical machine includes a stator core 12; a plurality of wires 28 wound around stator core 12 and forming power lines 24; and a plurality of connection portions 26 electrically connecting the plurality of lead wires 28, wherein the stator 10 of the rotating electrical machine includes protective cases 30 and 31 integrally including a container portion 34, an adhesive 46, and a receiving portion 36, the container portion 34 is formed of a side wall 38 and a bottom wall 40, and accommodates the plurality of connection portions 26, respectively, the adhesive 46 is filled in the container portion 34 and fixes the connection portions 26 accommodated in the container portion 34, and the receiving portion 36 receives the adhesive 46 in an uncured state that has overflowed from the container portion 34. Thus, by filling the space between the joint portion 26 of the lead 27 and the container portion 34 with the adhesive 46, even when an excessive vibration stress is applied, particularly, a vibration in a direction in which the two leads 28 joined together are opened with respect to the joint portion 26 is applied, damage due to such a vibration stress can be suppressed. In addition, in the case where the uncured adhesive 46 is filled so as to overflow from the container portion 34 arranged to surround the joint portion 26, the height of the adhesive 46 covering the joint portion 26 is kept uniform by flowing out to the receiving portion 36 formed around the container portion 34. This can uniformly suppress vibration of the adhesive 46.

In addition, according to the present embodiment, a plurality of grooves 48 are formed at a plurality of positions in the circumferential direction on the inner peripheral surface of the side wall 38 constituting the container portion 34. This suppresses the separation of the adhesive 46 from the container portion 34.

Also, according to the present embodiment, the plurality of container portions 34 are formed integrally with the receiving portion 36. This can reduce the number of components.

In addition, according to the present embodiment, the adhesive 46 is a resin material. This can suppress damage in the joint 26 due to excessive stress, and can further improve the insulation between the adjacent joints 26 and 26.

In the above-described embodiment, the joint 26 is an electrically joint between the bus bar 22 and the power line 24, but is not particularly limited thereto. For example, a protective case including a container portion 34 and a receiving portion 36 may be used for a connecting portion 26, which is the coil end 20 inserted into the slot 14 of the stator core 12 and welded to the end portion protruding from the slot 14 to the outside of the stator core 12, and the connecting portion 26 surrounded by the container portion 34 may be filled with the adhesive 46.

Next, another embodiment of the present invention will be explained. In the following description, the same reference numerals are given to the common portions of the embodiments, and the description thereof will be omitted.

[ example 2 ]

In the present embodiment, the adhesive 46 is different in that a conductive material is used instead of a resin material.

Fig. 3 schematically shows a state in which the joint 26 where the bus bar 22 and the power wire 24 are joined together by welding is inserted into the adhesive 46. In this embodiment, as the adhesive 46 shown in fig. 3, for example, a conductive paste in which powder of a conductive material such as copper is dispersed in an adhesive or the like, a brazing material for melting a metal, a low melting point metal such as a solder material, or the like can be used.

According to the present embodiment, the adhesive 46 is a conductive material. Thereby, damage in the joint 26 caused by excessive stress can be suppressed, and the conductivity in the joint 26 can be improved. In particular, when the adhesive 46 is made of a low-melting-point metal such as solder, the wires 28 are also strongly bonded to the low-melting-point metal, and damage is further suppressed.

[ example 3 ]

In the present embodiment, the bottom wall 40 of the protective cases 30 and 31 has a bottom wall opening 50 shown in fig. 8 into which the joint 26 can be inserted, which is different from the foregoing embodiments.

Fig. 7 shows a curing process for accommodating the joint 26 between the power line 24 and the bus bar 22 in the container portion 34 of the protective cases 30 and 31 and fixing the joint to the protective cases 30 and 31 with an adhesive 46. When the stator core 12 is installed in the vehicle, the connection portion 26 is located above the stator core 12, and the bottom wall 40 of the container portion 34 does not have the bottom wall opening 50 into which the connection portion 26 is inserted, the stator core 12 needs to be inverted to suppress leakage of the adhesive 46 from the container portion 34, the container portion 34 is assembled to the connection portion 26, and after the adhesive 46 is cured to increase its viscosity, the stator core 12 is inverted again to be installed in the vehicle.

In fig. 8, the protective cases 30 and 31 have a bottom wall opening 50 in the bottom wall 40. The bottom wall opening 50 is sized to allow the connection portion 26 of the power wire 24 and the bus bar 22 to be inserted therethrough, and is also sized to prevent the adhesive 46 made of a resin material or a conductive material from leaking through the gap between the bottom wall opening 50, which has been inserted through the connection portion 26 of the power wire 24 and the bus bar 22, and the power wire 24 and the bus bar 22. Further, as the material constituting the bottom wall 40 of the cases 30 and 31, for example, a material such as resin or rubber capable of enlarging the bottom wall opening 50 when the joint 26 passes is used, and thus leakage of the adhesive 46 can be suppressed.

According to the present embodiment, the same effects as those of the above-described embodiments can be expected, and the bottom wall 40 of the container portion 34 has the bottom wall opening 50 into which the coupling portion 26 is inserted. Thus, when the stator core 12 is installed in the vehicle, the connection portion 26 is positioned above the stator core 12, and the bottom wall 40 of the container portion 34 is not inserted into the bottom wall opening 50 of the connection portion 26, the stator core 12 needs to be inverted to suppress leakage of the adhesive 46 from the container portion 34, the container portion 34 is assembled to the connection portion 26, and after the adhesive 46 is cured to increase its viscosity, the stator core 12 is inverted again and installed in the vehicle. Since the bottom wall 40 of the container portion 34 has the bottom wall opening 50, the stator core 12 does not need to be turned over, and the container portion 34 can be easily assembled.

In fig. 5 and 6 of the foregoing embodiment, the side wall 38 forming the container portion 34 is shown as a cylindrical shape having a circular cross-sectional shape, but the cylindrical shape is not particularly required, and the cross-sectional shape may be an ellipse, a polygon including a triangle, or the like.

In the foregoing embodiment, the bonding portion 26 is formed by soldering the plurality of wires 28, but is not particularly limited to soldering. For example, in the joint portion 26 that is electrically connected by caulking the plurality of lead wires 28 using a crimping member, the container portion 34 and the adhesive 46 in the foregoing embodiment can also be used.

While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is also applicable to other embodiments. The above embodiment is merely an embodiment, and the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art.