阅读说明：本技术 一种压缩机及其装配方法 (Compressor and assembling method thereof ) 是由 廖欣 陈玉 张�浩 于 2019-09-10 设计创作，主要内容包括：本发明公开了一种压缩机及其装配方法,包括：壳体,定子,曲轴,可转动的设置于所述定子内的转子,固定块,曲轴的长轴的远离所述短轴的端部周侧设有一第一键槽,所述转子远离所述压缩组件的一端的内壁设有一与所述第一键槽相连通第二键槽,所述固定块的朝向所述转子的端面设有一第三键槽,所述第一键槽、所述第二键槽以及所述第三键槽合围形成一定位腔室,所述腔室中设有一定位键,本发明避免了压铸好的转子铁芯内部钢板出现部分变形,从而提高了电机的功率；同时与现有的电机装配工艺相比,曲轴与转子通过机械连接的方式配合在一起,更有助于保证了定子和转子之间的间隙的均匀性,降低了电机运转过程中的电磁噪音。(The invention discloses a compressor and an assembly method thereof, comprising the following steps: the compression assembly comprises a shell, a stator, a crankshaft, a rotor and a fixed block, wherein the rotor is rotatably arranged in the stator, a first key groove is formed in the periphery of the end part, far away from the short shaft, of the long shaft of the crankshaft, a second key groove communicated with the first key groove is formed in the inner wall of one end, far away from the compression assembly, of the rotor, a third key groove is formed in the end face, facing the rotor, of the fixed block, the first key groove, the second key groove and the third key groove surround to form a positioning cavity, and a positioning key is arranged in the cavity; compared with the existing motor assembly process, the motor assembly process has the advantages that the crankshaft is matched with the rotor in a mechanical connection mode, the uniformity of the gap between the stator and the rotor is guaranteed, and the electromagnetic noise in the motor operation process is reduced.)

1. A rotary compressor, comprising:

a housing;

a stator disposed in the housing;

a rotor rotatably disposed within the stator;

a compression assembly disposed within the housing and located to one side of the stator;

a crankshaft having a long axis connected to the rotor, a short axis connected to the compression assembly, and an eccentric portion between the long axis and the short axis;

the end face of the fixing block, facing the rotor, is in contact with the end face of the rotor, far away from the compression assembly;

wherein, keeping away from of major axis the tip week side of minor axis is equipped with a first keyway, the rotor is kept away from the inner wall of the one end of compression subassembly be equipped with one with first keyway is linked together the second keyway, the orientation of fixed block the terminal surface of rotor is equipped with a third keyway, first keyway the second keyway and third keyway surrounds and forms a location cavity, be equipped with a positioning key in the cavity.

2. The rotary compressor of claim 1, wherein the positioning key is a block key having a length in an axial direction greater than a length in a radial direction.

3. The rotary compressor of claim 1, wherein a length of the first key groove in an axial direction of the crankshaft is equal to or greater than a length of the second key groove in the axial direction of the crankshaft.

4. The rotary compressor of claim 1, wherein the first key slot has a first opening located at an end surface of the long shaft away from the short shaft, the second key slot has a second opening located at an end surface of the rotor away from the compression assembly, the first opening and the second opening are respectively communicated with the third key slot, and a length of the first opening in a radial direction of the crankshaft is greater than or equal to a length of the second opening in the radial direction of the crankshaft.

5. The rotary compressor of claim 1, wherein a positioning step is disposed on the outer periphery of the long shaft, a projection of the positioning key on a reference plane coincides with a projection of the positioning step on the reference plane, and the reference plane is an end surface of the fixing block facing the rotor.

6. The rotary compressor of claim 1, wherein a depth of the first end of the positioning key axially into the third keyway portion is less than a depth of the second end of the positioning key axially into the first keyway portion.

7. The rotary compressor of claim 1, wherein the end of the long shaft far from the short shaft is provided with a blind threaded hole, and the fixing block is screwed with the blind threaded hole through a fixing bolt.

8. The rotary compressor of claim 5, wherein the crankshaft is provided at a center thereof with a central oil passage extending in an axial direction of the crankshaft, an opening of a first end of the central oil passage is provided at an end surface of the short shaft remote from the long shaft, a lateral oil hole is provided at a side wall of the long shaft, the lateral oil hole is located between the eccentric portion and the positioning step and adjacent to the positioning step, the lateral oil hole communicates with a second end of the central oil passage, an end portion of the long shaft remote from the short shaft is provided with a hole, an inner wall of the hole is provided with an internal thread, and the fixing block is fixed to the crankshaft by a fixing bolt fitted to the internal thread.

9. The rotary compressor of claim 1, wherein the compression assembly comprises:

a cylinder;

the upper cylinder cover is arranged on one side of the cylinder, and the side wall of the edge of the upper cylinder cover is welded with the inner wall of the shell;

and the lower cylinder cover is arranged on the other side of the cylinder and surrounds the cylinder and the upper cylinder cover to form a compression space for compressing the refrigerant.

10. A compressor assembling method applied to the rotary compressor of any one of claims 1 to 9, comprising the steps of:

connecting the stator and the shell in a shrink fit manner;

placing a compression assembly connected with a crankshaft in a housing, the compression assembly being located on one side of the stator;

concentrically positioning the compression assembly, the stator and the shell, and connecting an upper cylinder cover in the compression assembly with the inner wall of the shell after positioning;

inserting a rotor into the stator and sleeving the rotor outside a long shaft of the crankshaft, and simultaneously enabling a first key groove located at the end part, far away from the short shaft, of the long shaft and a second key groove located on the inner side of the rotor to be in butt joint communication with each other;

placing a positioning key in a space formed by the first key groove and the second key groove;

sleeving a fixing block on the end part, far away from the short shaft, of the long shaft, so that a third key groove, facing the end face of the rotor, of the fixing block, surrounds the first key groove and the second key groove to form a positioning cavity, and wraps the positioning key;

and fixedly connecting the fixed block, the rotor and the crankshaft.

Technical Field

The invention relates to the technology in the field of refrigeration, in particular to a compressor and an assembling method thereof.

Background

In the compressor of air conditioner, the motor is the power source of its work refrigeration, it is made up of rotor and stator two parts, it is the device that realizes the conversion between electric energy and mechanical energy, in order to make the motor in the compressor work normally, the assembly clearance between stator and rotor is especially important.

Fig. 1 is a schematic view of an assembly structure of a conventional air conditioner compressor. Referring to FIG. 1, in assembling the electric motor rotor 13 'of the air conditioning compressor 10', the rotor 13 'is interference fit with the crankshaft 15' typically using a shrink-fit process. In the assembly of the stator 12 'and the rotor 13', the stator 12 'and the housing 11' are sleeved together in a hot mode, then a pump body (a compression assembly 14 'provided with a crankshaft 15') with the rotor 13 is matched with the stator 12 'in a positioning mode, the pump body and the housing 11' are fixed together in a welding mode after the positioning is finished, therefore, in order to guarantee that a sufficient air gap space exists between the stator 12 'and the rotor 13', a gap sheet with a certain thickness is inserted between the stator 12 'and the rotor 13' before the welding, the gap sheet is pulled out after the welding is finished, and the stator 12 'and the rotor 13' are assembled together in the mode.

However, the above-described conventional compressor has two problems:

firstly, in the process of rotor assembly, a rotor is in interference fit with a long shaft of a crankshaft through heating, a steel plate in a die-cast iron core can be partially deformed and attached in the process of heating the rotor, eddy current loss is generated in the process of motor operation, and the power of the motor is influenced;

in the assembly of the stator and the rotor, a gap sheet between the stator and the rotor is thin, the strength is not enough, the lamination is not uniform, and a pump body can incline towards a single direction when being welded and deformed, so that the gap between the stator and the rotor is not uniform after the assembly is finished, and the electromagnetic sound is poor in the operation process of the motor.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a compressor and an assembly method thereof, wherein a rotor of a motor is directly sleeved on a long shaft of a crankshaft, the rotating force of the motor is transmitted between the rotor and the crankshaft through a positioning key, and the rotor does not need to be heated, so that the partial deformation of a steel plate in a die-cast iron core is avoided, and the power of the motor is improved; compared with the existing motor assembly process, the motor assembly process has the advantages that the crankshaft is matched with the rotor in a mechanical connection mode, the uniformity of the gap between the stator and the rotor is guaranteed, and the electromagnetic noise in the motor operation process is reduced.

According to an aspect of the present invention, there is provided a rotary compressor including:

a housing;

a stator disposed in the housing;

a rotor rotatably disposed within the stator;

a compression assembly disposed within the housing and located on a lower side of the stator;

a crankshaft having a long axis connected to the rotor, a short axis connected to the compression assembly, and an eccentric portion between the long axis and the short axis;

the end face of the fixing block, facing the rotor, is in contact with the end face of the rotor, far away from the compression assembly;

wherein, keeping away from of major axis the tip week side of minor axis is equipped with a first keyway, the rotor is kept away from the inner wall of the one end of compression subassembly be equipped with one with first keyway is linked together the second keyway, the orientation of fixed block the terminal surface of rotor is equipped with a third keyway, first keyway the second keyway and third keyway surrounds and forms a location cavity, be equipped with a positioning key in the cavity.

Preferably, the positioning key is a block key, and the axial length of the block key is greater than the radial length of the block key.

Preferably, a length of the first key groove in the axial direction of the crankshaft is equal to or greater than a length of the second key groove in the axial direction of the crankshaft.

Preferably, the first key groove has a first opening located on an end surface of the long shaft away from the short shaft, the second key groove has a second opening located on an end surface of the rotor away from the compression assembly, the first opening and the second opening are respectively communicated with the third key groove, and a length of the first opening in a radial direction of the crankshaft is greater than or equal to a length of the second opening in the radial direction of the crankshaft.

Preferably, a positioning step is arranged on the periphery of the long shaft, a projection of the positioning key on a reference plane is partially overlapped with a projection of the positioning step on the reference plane, and the reference plane is an end face of the fixing block facing the rotor.

Preferably, the depth of the first end of the positioning key axially into the third keyway portion is less than the depth of the second end of the positioning key axially into the first keyway portion.

Preferably, a threaded blind hole is formed in the end portion, far away from the short shaft, of the long shaft, and the fixing block is screwed with the threaded blind hole through a fixing bolt.

Preferably, a central oil path extending in the axial direction of the crankshaft is arranged in the center of the crankshaft, an opening at a first end of the central oil path is arranged on an end face, far away from the long axis, of the short axis, a transverse oil hole is arranged on the side wall of the long axis, the transverse oil hole is located between the eccentric portion and the positioning step and is adjacent to the positioning step, the transverse oil hole is communicated with a second end of the central oil path, a hole is arranged at an end portion, far away from the short axis, of the long axis, internal threads are arranged on the inner wall of the hole, and the fixing block is fixed to the crankshaft through a fixing bolt matched with the internal threads.

Preferably, the compression assembly comprises:

a cylinder;

the upper cylinder cover is arranged on one side of the cylinder, and the side wall of the edge of the upper cylinder cover is welded with the inner wall of the shell;

and the lower cylinder cover is arranged on the other side of the cylinder and surrounds the cylinder and the upper cylinder cover to form a compression space for compressing the refrigerant.

According to an aspect of the present invention, there is provided a compressor assembling method applied to the above rotary compressor, including the steps of:

connecting the stator and the shell in a shrink fit manner;

placing a compression assembly connected with a crankshaft in a housing, the compression assembly being located on one side of the stator;

concentrically positioning the compression assembly, the stator and the shell, and connecting an upper cylinder cover in the compression assembly with the inner wall of the shell after positioning;

inserting a rotor into the stator and sleeving the rotor outside a long shaft of the crankshaft, and simultaneously enabling a first key groove located at the end part, far away from the short shaft, of the long shaft and a second key groove located on the inner side of the rotor to be in butt joint communication with each other;

placing a positioning key in a space formed by the first key groove and the second key groove;

sleeving a fixing block on the end part, far away from the short shaft, of the long shaft, so that a third key groove, facing the end face of the rotor, of the fixing block, surrounds the first key groove and the second key groove to form a positioning cavity, and wraps the positioning key;

and fixedly connecting the fixed block, the rotor and the crankshaft.

The beneficial effects of the above technical scheme are:

the rotor of the motor is directly sleeved on the long shaft of the crankshaft, the rotating force of the motor is transmitted between the rotor and the crankshaft through the positioning key, and the rotor does not need to be heated, so that partial deformation of a steel plate in a die-cast iron core is avoided, and the power of the motor is improved;

compared with the existing motor assembly process, the motor assembly process has the advantages that the crankshaft is matched with the rotor in a mechanical connection mode, the uniformity of the gap between the stator and the rotor is guaranteed, and the electromagnetic noise in the motor operation process is reduced.

Further features and advantages of the invention, as well as the structure and operation of various embodiments of the invention, are described in detail below with reference to the accompanying drawings. It should be noted that the present invention is not limited to the specific embodiments described herein. These examples are given herein for illustrative purposes only.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.

Fig. 1 is a schematic view of an assembly structure of a conventional air conditioner compressor;

FIG. 2 is a schematic view of an assembly structure of a compressor in the present invention;

FIG. 3 is a schematic view of the assembly of the housing and stator of FIG. 2;

FIG. 4 is a schematic structural view of the compression assembly of FIG. 2;

FIG. 5 is an assembled schematic view of the compression assembly and housing of FIG. 2;

FIG. 6 is an exploded view of the rotor and mounting block interconnection of FIG. 2;

FIG. 7 is a schematic structural diagram of the crankshaft of FIG. 2;

fig. 8 is a schematic structural view of the fixing block of fig. 2;

FIG. 9 is a schematic view of the alignment key of FIG. 2;

FIG. 10 is a flow chart schematic of a compressor assembly method.

List of reference numerals:

10 compressor

11 a housing;

12 a stator;

13 a rotor;

131 second key groove

14 a compression assembly;

141 upper cylinder cover

142 air cylinder

143 lower cylinder cover

15 crankshaft

151 long axis

152 eccentric portion

153 short axis

154 first keyway

155 hole

156 positioning step

157 horizontal oil hole

16 positioning key

17 fixed block

171 fixing bolt

172 through hole

173 third key slot

The features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Throughout the drawings, like reference numerals designate corresponding elements. In the drawings, like reference numbers generally indicate identical, functionally similar, and/or structurally similar elements.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

According to one aspect of the present invention, a compressor is provided.

Fig. 2 is a schematic view of an assembly structure of a compressor in the present invention. The compressor 10 shown in fig. 2 is a rotary vertical compressor 10, and includes a housing 11 having a cylindrical shape, and a motor is provided at an upper portion in the housing 11. The motor comprises a stator 12 and a rotor 13, wherein the stator 12 is arranged at the upper part of a shell 11, the rotor 13 is rotatably arranged in the stator 12, and a gap exists between the stator 12 and the rotor 13. Also disposed within the housing 11 is a compression assembly 14, the compression assembly 14 being disposed on the underside of the stator 12. The rotor 13 of the compressor 10 is connected to the compression unit 14 through the crankshaft 15, and the rotational force of the motor is transmitted to the compression unit 14 through the crankshaft 15, and the refrigerant is compressed by the compression unit 14. The crankshaft 15 has a major axis 151, a minor axis 153, and an eccentric portion 152 located between the major axis 151 and the minor axis 153. A first key groove 154 is arranged on the periphery of the tail part (the end part far away from the short shaft) of the long shaft 151, a second key groove 131 communicated with the first key groove 154 is arranged on the inner wall of the rotor 13, and the length of the first key groove 154 along the axial direction of the crankshaft 15 is larger than or equal to the length of the second key groove 131 along the axial direction of the crankshaft 15. The lower side surface of the fixed block 17 is abutted against the upper end surface of the rotor 13, the lower side surface (the end surface facing the rotor) of the fixed block 17 is provided with a third key groove 173, the first key groove 154, the second key groove 131 and the third key groove 173 surround to form a positioning cavity, and a positioning key 16 is arranged in the cavity. The rotation force of the rotor 13 can be transmitted to the crankshaft 15 by the positioning key 16, and the axial movement of the rotor 13 along the crankshaft 15 can be further restricted.

Fig. 3 is a schematic view of the assembly of the housing 11 and the stator 12 in fig. 2. Referring to fig. 3, a casing 11 of the compressor 10 has a generally cylindrical shape, and the casing 11 has an opening at each of upper and lower ends thereof. The upper and lower ends of the housing 11 are further provided with an upper housing cover (not shown) and a lower housing cover (not shown), and the housing 11, the upper housing cover and the lower housing cover together form an accommodating space, so that each functional component of the compressor 10 is disposed in the accommodating space. The stator 12 of the motor is disposed in the housing 11 and is located at an upper portion of the housing 11. The housing 11 and the stator 12 may be an interference fit, and fit together by a shrink fit.

Fig. 4 is a schematic diagram of the construction of the compressing assembly 14 in fig. 2. Referring to fig. 4, the compressing assembly 14 includes a cylinder 142, an upper cylinder head 141, and a lower cylinder head 143. The upper cylinder cover 141 is disposed at the upper end of the cylinder 142, the lower cylinder cover 143 is disposed at the lower end of the cylinder 142, and the upper cylinder cover 141, the lower cylinder cover 143, and the cylinder 142 surround to form a compression space for compressing the refrigerant. The upper cylinder head 141 is provided with a bearing portion, the lower cylinder head 143 is also provided with a bearing portion, and the crankshaft 15 is supported by the bearing portion of the upper cylinder head 141 and the bearing portion of the lower cylinder head 143. The short shaft 153 of the crankshaft 15 is supported by a bearing portion of the lower cylinder head 143. The eccentric portion 152 of the crankshaft 15 is located in the cylinder 142, and the eccentric portion 152 of the crankshaft 15 is sleeved with a rotary piston, so that the rotary piston located in the cylinder 142 rotates along with the rotation of the crankshaft 15, and compresses the refrigerant in the cylinder 142 and then discharges the refrigerant out of the cylinder 142.

Fig. 5 is a schematic view of the assembly of the compression assembly 14 and the housing 11 of fig. 2. The compression assembly 14 is disposed within the housing 11 and is located at the lower side of the stator 12. The upper cylinder cover 141 of the compressing assembly 14 is fixed to the inner wall of the casing 11 by welding, that is, the compressing assembly 14 is welded to the inner wall of the casing 11 to fix the compressing assembly 14 to the casing 11.

Fig. 6 is an exploded view of the structure in which the rotor 13 and the fixed block 17 of fig. 2 are coupled to each other. Fig. 7 is a schematic structural view of the crankshaft 15 in fig. 2. Fig. 8 is a schematic structural view of the fixing block 17 in fig. 2. Referring to fig. 6 to 8, a through hole 172 is formed at the center of the fixing block 17, and the fixing block 17 is fixed to the crankshaft 15 by a fixing bolt 171 passing through the through hole 172. The crankshaft 15 has a long axis 151, a short axis 153, and an eccentric portion 152, and the eccentric portion 152 is located between the long axis 151 and the short axis 153. The rotor 13 is sleeved on the long shaft 151, and a first key groove 154 is formed at an end of the long shaft 151, and the first key groove 154 is formed along the axial direction of the crankshaft 15. The inner wall of the rotor 13 is provided with a second key groove 131, and the second key groove 131 extends in the axial direction of the rotor 13. The fixing block 17 is circular, and a third key groove 173 is formed at a lower side surface of the fixing block 17. The first key groove 154, the second key groove 131 and the third key groove 173 surround to form a positioning space, and a positioning key 16 adapted to the positioning space is disposed in the positioning space. The first key groove 154 has a first opening on the upper end surface of the long shaft 151, the second key groove 131 has a second opening on the upper end surface of the rotor 13, the first opening and the second opening are respectively communicated with the third key groove 173, and the length of the second opening along the radial direction of the crankshaft 15 is greater than or equal to the length of the first opening along the radial direction of the crankshaft 15. The outer periphery of the long shaft 151 of the crankshaft 15 is provided with a positioning step 156 for supporting the lower end face of the rotor 13, and the projection of the positioning key 16 on the lower side face (reference plane) of the fixed block 17 is overlapped with the projection of the positioning step 156 on the reference plane. The positioning step 156, the fixing block 17 and the positioning key 16 arranged on the crankshaft 15 are used for clamping the rotor 13 sleeved on the long shaft 151 together, so that the axial movement of the rotor 13 along the crankshaft 15 is limited.

Fig. 9 is a schematic structural view of the navigation key 16 in fig. 2. The positioning key 16 shown in fig. 9 is a block key extending in an axial section of the crankshaft 15, and the positioning key 16 has a length in the axial direction larger than that in the radial direction. The depth h1 of the portion of the positioning key 16 entering the third key groove 173 at the first end is less than the depth h2 of the portion of the positioning key 16 entering the first key groove 154 at the second end, and the width w2 of the positioning key 16 at the portion of the first key groove 154 is greater than or equal to the width w1 at the portion of the second key groove 131, i.e., h1 is less than h2 and w2 is greater than or equal to w1, which size of the positioning key 16 enables reasonable stress distribution of the positioning key 16.

Referring again to fig. 7, the crankshaft 15 is provided with a central oil passage (not shown) extending in the axial direction of the crankshaft 15, an opening at a first end of the central oil passage is formed at an end surface of the stub shaft 153 of the crankshaft 15, a cross oil hole 157 is provided between the eccentric portion 152 and the positioning step 156 and is adjacent to the positioning step 156, and the central oil passage communicates with the space inside the housing 11 through the cross oil hole 157. I.e. the central oil passage does not extend through the entire crankshaft 15. The end of the long shaft 151 is provided with a hole 155, and the fixing block 17 is screwed with the hole 155 through a fixing bolt 171. When the compression assembly 14 of the compressor 10 operates, the compression assembly 14 discharges a high-pressure refrigerant, so that the space of the casing 11 is in a high-pressure state, and the lubricating oil at the bottom of the casing 11 enters the central oil path from the first end of the central oil path (the end of the short shaft 153) under the action of high pressure, and is discharged through a transverse oil hole 157 arranged between the eccentric portion 152 and the positioning step 156 to lubricate each component.

In accordance with one aspect of the present invention, a method of assembling compressor 10 is provided.

Fig. 10 is a flow chart illustrating an assembly method of compressor 10. The compressor 10 assembling method shown in fig. 10 includes step S1, step S2, step S3, step S4, step S5, and step S6.

Step S1, shrink-fitting the stator and the housing.

And step S2, placing a compression assembly connected with a crankshaft in a shell, wherein the compression assembly is positioned on one side of the stator.

And step S3, concentrically positioning the compression assembly, the stator and the shell, and connecting an upper cylinder cover in the compression assembly with the inner wall of the shell after positioning.

Step S4, inserting the rotor into the stator and sleeving the rotor outside the long axis of the crankshaft, and simultaneously, butt-jointing and communicating the first key groove located at the end of the long axis far from the short axis and the second key groove located at the inner side of the rotor.

Step S5, a positioning key is placed in the space formed by the first key slot and the second key slot.

Step S6, sleeving a fixing block on an end of the long shaft far from the short shaft, so that a third key groove located on an end surface of the fixing block facing the rotor, the first key groove and the second key groove surround to form a positioning chamber, and wrapping the positioning key. And step S7, the fixed block and the rotor are tightly connected with the crankshaft.

In conclusion, the compressor and the assembly method thereof in the invention have the advantages that the rotor of the motor is directly sleeved on the long shaft of the crankshaft, the rotating force of the motor is transmitted between the rotor and the crankshaft through the positioning key, and the rotor does not need to be heated, so that the phenomenon that a steel plate in a die-cast iron core is partially deformed to generate eddy current loss is avoided, the power of the motor is reduced, and the power of the motor is further improved; compared with the existing motor assembly process, the motor assembly process has the advantages that the crankshaft is matched with the rotor in a mechanical connection mode, the uniformity of the gap between the stator and the rotor is guaranteed, and the electromagnetic noise in the motor operation process is reduced.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.