Assembly assembly device and assembly method for an electric motor rotor

Abstract

This application discloses an assembly device for an electric motor rotor. The assembly device includes a tie rod, a pressure plate, a nylon positioning sleeve, and a first adjusting nut. The rotor is fixed to the connecting portion of the tie rod via the nylon positioning sleeve, pressure plate, and first adjusting nut. The tie rod also includes a guide portion for guiding the rotor fixed to the connecting portion into the stator cavity of the electric motor. This assembly device can support and guide the rotor, thereby enabling precise and safe assembly of the rotor and stator, improving work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor assembly, in particular to an assembly combination device and method for motor rotor. BACKGROUND

[0002] In recent years, with the rapid growth of energy demand and the increasingly exhausted contradiction of petrochemical resources, new energy vehicles are gradually widely used because of the use of electric drive. New energy vehicles are the trend of future vehicle development, and electric motors, as one of the core components of new energy vehicles, also attract the attention of researchers.

[0003] In the new product development and trial production stage of the electric motor, it is crucial to verify its processability (assemblability and maintainability). In the prior art, the rotor, stator and key parts of the motor are usually assembled by manual assembly.

[0004] However, due to the strong magnetic attraction between the stator core and the rotor permanent magnet, the rotor is easily attracted by the stator magnetic force and quickly sinks during the manual assembly process in the above trial production stage, so it is difficult to control and position the rotor, the accuracy of the installation of the stator and the rotor is difficult to guarantee, and the installation difficulty is also increased, and in extreme cases the silicon steel sheets of the rotor and the stator may be damaged. In addition, due to the uncontrolled assembly process, there is also a great safety hazard to the operator. SUMMARY

[0005] The embodiment of the present application provides an assembly combination device and method for motor rotor, to solve the problem of magnetic attraction between the rotor and the stator during assembly, so as to realize accurate and safe assembly of the motor rotor and the stator. The technical scheme is as follows:

[0006] On the one hand, an assembly combination device for motor rotor is provided, which comprises a pull rod, a pressure plate, a nylon positioning sleeve and a first adjusting nut.

[0007] The pull rod comprises a first threaded part, a connecting part, a guide part and a second threaded part in length direction, wherein the outer diameter of the connecting part is smaller than that of the guide part, and a step surface is formed at the intersection of the connecting part and the guide part;

[0008] The nylon positioning sleeve is sleeved on the connecting part, and the lower end surface of the nylon positioning sleeve is attached to the step surface;

[0009] The pressure plate is a hollow cylinder with a flange, and the inner diameter of the cylinder is greater than the outer diameter of the first threaded part;

[0010] The inner thread of the first adjusting nut is matched with the outer thread of the first threaded part.

[0011] In a possible implementation, the assembly combination device further comprises a first pressing sleeve, which is a cylindrical sleeve, and a waist-shaped slot is symmetrically formed in the middle side wall of the sleeve along the axial direction;

[0012] The inner diameter of the first pressing sleeve is equal to the outer diameter of the guide part, and the length of the first pressing sleeve is greater than the length of the guide part and less than the sum of the lengths of the guide part and the second threaded part.

[0013] In a possible implementation, the assembly combination device further comprises a thrust rod, which comprises a rod head and a cylindrical rod body;

[0014] Two circular through holes are symmetrically arranged on the middle rod wall of the guide part, and the thrust rod can pass through the guide part from the radial direction through the two through holes and be limited at the through holes.

[0015] In a possible implementation, the outer diameter of the rod head is greater than the outer diameter of the rod body, a stepped surface is formed at the intersection of the rod head and the rod body, and the outer diameter of the rod body is equal to the inner diameter of the through hole; and the width of the waist-shaped slot is equal to the inner diameter of the through hole.

[0016] In a possible implementation, the assembly combination device further comprises a second adjusting nut, and the inner thread of the second adjusting nut is matched with the outer thread of the second threaded part.

[0017] In a possible implementation, the assembly combination device further comprises a second pressing sleeve, which is a cylindrical sleeve with a flange, and the surface of the flange comprises two opposite end faces, wherein four grooves (20) are circumferentially and equally arranged on the end face away from the cylindrical sleeve.

[0018] On the other hand, a method for assembling a motor rotor is provided, which uses the above-mentioned assembly combination device to assemble the rotor, and the method comprises:

[0019] The motor main shell is fixed on the operation table, so that the central axis direction of the stator already assembled in the main shell is parallel to the main surface of the operation table;

[0020] Connecting the pull rod and the rotor to form a pre-assembled body includes: inserting the second end of the rotor shaft into the connecting part of the pull rod until the end face of the second end of the rotor shaft is in contact with the stepped surface of the pull rod, while the nylon positioning sleeve fitted on the pull rod is also in contact with the inner wall of the second end of the rotor shaft, so that the nylon positioning sleeve can position the second end of the rotor shaft radially; inserting the pressure plate from the connecting part so that the cylinder of the pressure plate is inserted into the shaft hole of the first end of the rotor shaft; screwing the first adjusting nut into the first threaded part, rotating the first adjusting nut clockwise to push the pressure plate so that the cylinder of the pressure plate is fully inserted into the shaft hole of the first end of the rotor shaft, and so that the lower end face of the flange of the pressure plate is in contact with the end face of the first end of the rotor shaft, thereby fixing the rotor shaft in the connecting part;

[0021] Pushing the pre-assembled assembly into the main housing includes: first, laying insulating paper on the inner wall of the stator to prevent the rotor and the stator from directly contacting and colliding during the pushing process; using a lifting device to horizontally lift the pre-assembled assembly and adjust it to balance; continuing to send one end of the guide portion in the pre-assembled assembly into the inner cavity of the stator in the horizontal direction until the guide portion passes through the inner hole of the first bearing of the first bearing already assembled in the main housing, where the inner hole of the first bearing radially limits the guide portion; continuing to push the pre-assembled assembly, the rotor in the pre-assembled assembly is sent into the inner cavity of the stator under the guidance of the guide portion.

[0022] In one possible implementation, the assembly method further includes pressing the second end of the rotor shaft into the inner bore of the first bearing, comprising:

[0023] Insert the first pressure sleeve into the guide portion until the first pressure sleeve abuts against the first bearing;

[0024] The thrust rod is sequentially inserted into the waist-shaped groove of the first pressure sleeve, the through hole of the pull rod, and the anti-rotation slot correspondingly opened on the operating table, including: adjusting the position of the waist-shaped groove on the side wall of the first pressure sleeve and the through hole on the side wall of the guide portion so that the through hole is located below the groove of the waist-shaped groove, so that the thrust rod passes through the waist-shaped groove and the through hole in a direction perpendicular to the plane of the operating table, and finally inserts into the anti-rotation slot correspondingly opened on the operating table, wherein the rod head of the thrust rod is limited at the waist-shaped groove;

[0025] Screw the second adjusting nut into the second threaded part, and rotate the second adjusting nut clockwise so that the pull rod drives the second end of the rotor shaft to move along the central axis of the first bearing toward the first bearing, thereby pressing the second end of the rotor shaft into the inner hole of the first bearing.

[0026] In one possible implementation, the assembly method further includes pressing the second bearing into the second bearing groove of the motor rear cover, including:

[0027] Remove the pressure plate and the first adjusting nut fixed to the connecting part, insert the motor rear cover through the connecting part and fix it to the main housing, wherein the motor rear cover has a second bearing groove formed on it, and the central axis of the second bearing groove coincides with that of the first bearing groove.

[0028] Insert the second bearing through the connecting part until it abuts against the second bearing groove;

[0029] The second pressure sleeve and the pressure plate (2) are inserted into the connecting part in sequence;

[0030] Screw the first adjusting nut into the first threaded portion, rotate the first adjusting nut clockwise to push the pressure plate, and cause the lower end face of the flange of the pressure plate to further push the second pressure sleeve, so that the second pressure sleeve presses the second bearing into the second bearing groove.

[0031] In one possible implementation, the assembly method further includes pressing the resolver rotor into an annular limiting groove on the motor rear cover for assembling the resolver rotor, including:

[0032] Remove the pressure plate, the second pressure sleeve, and the first adjusting nut fixed to the connecting part, and insert the resolver rotor into the connecting part until the resolver rotor abuts against the annular limiting groove;

[0033] The second pressure sleeve and the pressure plate are inserted into the connecting part in sequence until the four grooves on the second pressure sleeve respectively mate with the four protrusions on the surface of the resolver rotor;

[0034] Screw the first adjusting nut connection into the first threaded part, rotate the first adjusting nut clockwise to push the pressure plate, and make the lower end face of the flange of the pressure plate further push the second pressure sleeve, so that the second pressure sleeve presses the resolver rotor into the annular limiting groove.

[0035] The beneficial effects of the technical solutions provided in this application are:

[0036] This application provides an assembly assembly device and method for an electric motor rotor. The assembly assembly device includes a tie rod, a pressure plate, a nylon positioning sleeve, and a first adjusting nut. The assembly assembly device can be detachably assembled with the rotor. Before assembling the rotor into the main housing, the assembly assembly device is prepared for assembly with the rotor by inserting the hollow rotor shaft into the connecting part of the tie rod and positioning it at the stepped surface of the tie rod. The nylon positioning sleeve on the tie rod further positions the rotor shaft radially. Then, the pressure plate is inserted into the first threaded part, so that the cylinder of the pressure plate is inserted into the rotor shaft hole. The first adjusting nut is screwed into the first threaded part until the lower end face of the first adjusting nut is in contact with the upper end face of the flange in the pressure plate, thereby fixing the rotor shaft to the connecting part of the tie rod.

[0037] The main housing of the motor into which the rotor is to be assembled includes an outer shell, a stator, and a first bearing. The rotor is to be assembled from the rear end of the outer shell into the inner cavity of the stator. The first bearing is already installed in the first bearing slot at the front end of the outer shell. In addition, the stator is already assembled into the outer shell, and the first bearing coincides with the central axis of the stator.

[0038] During assembly, one end of the guide portion of the pull rod is inserted into the main housing, allowing it to enter the inner bore of the first bearing. The guide portion is radially positioned and controlled by the first bearing, ensuring it can only move along the central axis of the first bearing, which is also the direction of the stator's central axis. The pre-assembled assembly continues to be pushed forward, and the rotor, guided by the guide portion, also moves along the stator's central axis until the first end of the rotor shaft is positioned at the edge of the inner bore of the first bearing, ready for the next press-fitting step.

[0039] This assembly assembly device can fix the rotor on the tie rod, and the tie rod can be pre-positioned with the inner hole of the first bearing. Therefore, during the assembly of the rotor and stator, the assembly assembly device can support and guide the rotor, so that the rotor can move stably and accurately along the direction of the stator central axis. This improves the controllability of rotor and stator assembly, avoids damage to the motor and safety hazards to operators caused by the magnetic attraction between the rotor and stator during the assembly process, and also ensures the coaxiality of the rotor and stator in the motor.

[0040] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this disclosure. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of an assembly and combination device for an electric motor rotor provided in an embodiment of this application. The device has been combined with the rotor and bearing.

[0042] Figure 2 This is a schematic diagram of the structure of a pressure plate provided in an embodiment of this application;

[0043] Figure 3 This is a schematic diagram of the structure of a thrust rod provided in an embodiment of this application;

[0044] Figure 4 This is a schematic diagram of the structure of a first pressure sleeve provided in an embodiment of this application;

[0045] Figure 5 This is a schematic diagram of the structure of a second pressure sleeve provided in an embodiment of this application;

[0046] Figure 6 This is a schematic diagram of a structure for completing stator-rotor assembly using the assembly assembly device provided in an embodiment of this application;

[0047] Figure 7 This is a flowchart illustrating an assembly method for an electric motor rotor provided in an embodiment of this application;

[0048] Figure 8 This is a flowchart of an assembly method for an electric motor rotor provided in an embodiment of this application, which involves pressing the second end of the rotor shaft into the inner hole of a first bearing;

[0049] Figure 9 This is a flowchart of an assembly method for an electric motor rotor provided in an embodiment of this application, which involves pressing a second bearing into the second bearing groove of the motor rear cover;

[0050] Figure 10 This is a flowchart of an assembly method for an electric motor rotor provided in an embodiment of this application, which involves pressing a resolver rotor into the motor rear cover.

[0051] The reference numerals in the attached figures represent:

[0052] 1-Pull rod; 2-Pressure plate; 3-Nylon positioning sleeve;

[0053] 4 - First adjusting nut; 18 - Second adjusting nut;

[0054] 5-First threaded portion; 6-Connecting portion; 7-Guiding portion; 8-Second threaded portion; 9-Stepped surface; 15-Through hole;

[0055] 10 - First end of rotor shaft; 11 - Second end of rotor shaft; 12 - Rotor shaft; 13 - Rotor core; 14 - Rotor;

[0056] 16-First pressure sleeve; 17-Oval groove;

[0057] 19-Second pressure sleeve; 20-Groove;

[0058] 21-Put; 22-Shaft; 23-Head;

[0059] 24 - First bearing; 25 - Second bearing;

[0060] 26 - Motor rear cover; 34 - Annular limiting groove;

[0061] 27 - Second bearing groove; 31 - First bearing groove;

[0062] 28-Resolver rotor;

[0063] 29 - Outer casing; 30 - Stator;

[0064] 32-Operating table; 33-Anti-rotation groove;

[0065] 35 - Inner bore of the first bearing. Detailed Implementation

[0066] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0067] In the embodiments of this application, directional terms such as "upper," "lower," and "side" are generally used in the following ways: Figure 1 The relative positions shown are based on the given information, and these directional terms are used only to more clearly describe the relationships between structures, not to describe absolute positions. Positions may change when the product is placed in different orientations; for example, "up" and "down" may be interchanged.

[0068] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art. Some technical terms appearing in the embodiments of this application are described below.

[0069] To make the technical solutions and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. The three core components of a new energy vehicle's electric system—battery, motor, and electronic control—are the most critical technical systems, directly affecting the final performance of the product. The motor mainly consists of a rotor, stator, and housing. The rotor is located inside the stator cavity, and there is no contact between the rotor and stator. When the windings on the stator are connected to AC power, the rotor immediately begins to rotate and output power. The rotor is the main drive motor of a new energy vehicle, undertaking all functions related to the vehicle's movement. Therefore, the design and development of the motor is crucial for promoting the development of new energy vehicles. In the trial production stage of the motor, assembling the stator and rotor is a necessary step. However, due to the strong magnetic attraction between the stator core and the rotor permanent magnets, the rotor is easily attracted by the stator's magnetic force and sinks rapidly during the process of sending the rotor into the stator cavity. This makes it difficult to control and position the rotor, making it difficult to guarantee the accuracy of the stator-rotor installation and increasing the installation difficulty. In extreme cases, it may even damage the silicon steel sheets of the rotor and stator. Furthermore, the uncontrolled assembly process poses significant safety hazards to operators.

[0070] To address the aforementioned problems encountered during stator and rotor assembly, this invention provides an assembly and combination device for motor rotors. This device can be pre-assembled with the rotor and provides support and guidance for the rotor during stator assembly. While improving the controllability of rotor-stator assembly, it also ensures the coaxiality of the rotor and stator.

[0071] Figure 1 This is a schematic diagram of an assembly device for an electric motor rotor according to an embodiment of the present invention, wherein the device has been assembled with the rotor and bearings. See also... Figure 1 The assembly includes: a pull rod 1, a pressure plate 2, a nylon positioning sleeve 3, and a first adjusting nut 4. The pull rod 1 includes, in sequence along its length, a first threaded portion 5, a connecting portion 6, a guide portion 7, and a second threaded portion 8. The outer diameter of the connecting portion 6 is smaller than the outer diameter of the guide portion 7, and a stepped surface 9 is formed at the intersection of the connecting portion 6 and the guide portion 7. The nylon positioning sleeve 3 is fitted onto the connecting portion 6, and its lower end face is in contact with the stepped surface 9. The pressure plate 2 is a hollow cylinder with a flange, and the inner diameter of this cylinder is larger than the outer diameter of the first threaded portion 5. The internal thread of the first adjusting nut 4 mates with the external thread of the first threaded portion 5.

[0072] The tie rod 1 is used to combine with the rotor 14 and to support and guide the rotor 14 when it is assembled with the stator 30.

[0073] Specifically, from Figure 1As can be seen, the rotor 14 can be fixed to the connecting part 6 of the tie rod 1. The outer diameter of the connecting part 6 of the tie rod 1 is adapted to the inner diameter of the hollow rotor shaft 12 of the rotor 14, so that the rotor shaft 12 can be inserted into the connecting part 6. At the same time, the outer diameter of the guide part 7 of the tie rod 1 is larger than the inner diameter of the rotor shaft 12, so the rotor shaft 12 cannot pass through the guide part 7. A stepped surface 9 is formed at the intersection of the connecting part 6 and the guide part 7 of the tie rod 1. After the rotor shaft 12 is inserted into the connecting part 6, it is limited at the stepped surface 9, that is, the end face of the second end 11 of the rotor shaft abuts against the stepped surface 9. A nylon positioning sleeve 3 is also fitted on the connecting part 6 near the stepped surface 9. The nylon positioning sleeve 3 is used to further position the second end 11 of the rotor shaft radially.

[0074] To fix the rotor 14 to the tie rod 1, such as Figure 1 As shown, the first end 10 of the rotor shaft is also locked by the pressure plate 2 and the first adjusting nut 4. Specifically, with the rotor 14 already inserted into the connecting part 6 of the tie rod 1, the pressure plate 2 is inserted into the connecting part 6 of the tie rod 1. As mentioned above, the pressure plate 2 includes a hollow cylinder and a flange. The cylinder is inserted into the shaft hole of the first end 10 of the rotor shaft. Then, the first adjusting nut 4 is installed on the first threaded part 5. By screwing in the first adjusting nut 4, the upper end face of the flange of the pressure plate 2 is pushed, so that the cylinder of the pressure plate 2 is completely inserted into the shaft hole of the first end 10 of the rotor shaft, and the lower end face of the flange of the pressure plate 2 is in contact with the end face of the first end 10 of the rotor shaft. The first adjusting nut 4 is tightened to fix the first end 10 of the rotor shaft to the first threaded part 5.

[0075] Therefore, through the cooperation of the nylon positioning sleeve 3, the pressure plate 2, and the first adjusting nut 4 with the pull rod 1, the rotor 14 is fixed to the connecting part 6 of the pull rod 1, thereby forming a pre-assembled body.

[0076] Furthermore, the outer diameter of the connecting portion 6 of the tie rod 1 needs to match the inner diameter of the rotor shaft 12 in order to fix the rotor 14 in the connecting portion 6 of the tie rod 1. Specifically, the inner diameter of the rotor shaft 12 is not greater than the outer diameter of the connecting portion 6 of the tie rod 1, so that the rotor shaft 12 can be fitted into the connecting portion 6. To make the fixation between the rotor 14 and the connecting portion 6 more reliable, it is preferable that the inner diameter of the rotor shaft 12 is equal to the outer diameter of the connecting portion 6.

[0077] During the assembly of the rotor and stator 30, the guide portion 7 of the tie rod 1 guides the rotor 14, which is fixed to the connecting portion 6, to move in a directional manner. Specifically, the guide portion 7 of the tie rod 1 in the pre-assembled assembly is first inserted from the front end of the motor main housing into the inner cavity of the stator 30 inside the main housing until the guide portion 7 is inserted into the inner hole 35 of the first bearing located at the rear end of the main housing. The first bearing 24 has been installed in the first bearing groove 31 located at the front end of the motor main housing before the assembly of the rotor 14 and the stator 30. The inner hole 35 of the first bearing can limit the guide portion 7 in the radial direction, that is, the guide portion 7 loses its radial degree of freedom and can only move along its central axis. Keeping the pre-assembled assembly balanced in the horizontal direction, the rotor 14, which is fixed to the tie rod 1, continues to be pushed into the inner cavity of the stator 30. Under the guidance of the guide portion 7, the rotor 14 is fed into the inner cavity of the stator 30 at a controllable speed.

[0078] Furthermore, because the motor is located within the main housing, the central axes of the first bearing 24 and the stator 30 coincide to ensure stability during motor operation. Since the outer diameter of the guide portion 7 is equal to the inner diameter of the first bearing's inner bore 35, and the guide portion 7 is a uniform cylindrical rod, its central axis coincides with the central axis of the first bearing 24, and consequently, with the central axis of the stator 30. When the guide portion 7 guides the rotor 14 into the inner cavity of the stator 30 along its central axis, it also guides the rotor 14 into the inner cavity of the stator 30 along its central axis, ensuring the coaxiality of the rotor 14 and the stator 30.

[0079] Figure 2 A schematic diagram of the pressure plate 2 is shown. The pressure plate 2 is a hollow cylinder with a flange. When assembling the assembly with the rotor 14, the pressure plate 2 is inserted into the shaft hole at the first end 10 of the rotor shaft, and as shown... Figure 1As shown, the pressure plate 2 can pass through the first threaded portion 5. Therefore, the outer diameter of the hollow cylinder of the pressure plate 2 is not greater than the inner diameter of the shaft hole at the first end 10 of the rotor shaft, and the inner diameter of the hollow cylinder is not less than the outer diameter of the first threaded portion 5. To make the fixation of the pressure plate 2 and the first end 10 of the rotor shaft more secure, the outer wall of the hollow cylinder of the pressure plate 2 needs to be in contact with the inner wall of the first end 10 of the rotor shaft, and the inner wall of the hollow cylinder of the pressure plate 2 needs to be in close contact with the outer wall of the first threaded portion 5. Therefore, preferably, the outer diameter of the hollow cylinder of the pressure plate 2 is equal to the inner diameter of the first end 10 of the rotor shaft, and the inner diameter of the hollow cylinder of the pressure plate 2 is equal to the outer diameter of the first threaded portion 5. On the other hand, during assembly, the upper end face of the flange of the pressure plate 2 is in contact with the first adjusting nut 4, and the upper end face is used to receive the force from the first adjusting nut 4; the lower end face of the flange of the pressure plate 2 is used to press the end face of the first end 10 of the rotor shaft, that is, the lower end face is the pressing surface. Therefore, the flange of the pressure plate 2 is the intermediate medium for transmitting the force of the first adjusting nut 4 to the first end 10 of the rotor shaft. In order to achieve more effective transmission, the outer diameter of the flange of the pressure plate 2 is larger than the outer diameter of the first end 10 of the rotor shaft and larger than the outer diameter of the first adjusting nut 4.

[0080] In summary, this assembly device can fix the rotor 14 onto the tie rod 1, and the tie rod 1 can be pre-positioned with the inner hole 35 of the first bearing, thereby supporting the rotor 14 and guiding the rotor 14 into the inner cavity of the stator 30. During the assembly of the rotor 14 and the stator 30, the rotor 14 can move stably and accurately along the direction of the central axis of the stator 30, which improves the controllability of the rotor-stator assembly, avoids the damage to the motor and the safety hazards to the operator caused by the magnetic attraction between the rotor and stator during the assembly process, and also ensures the coaxiality of the rotor and stator in the motor.

[0081] During the assembly of the rotor and stator, after the rotor 14 is stably fed into the inner cavity of the stator 30, the second end 11 of the rotor shaft also needs to be pressed into the inner hole 35 of the first bearing; in addition, to complete the complete assembly of the motor, see [link to relevant documentation]. Figure 6 It is also necessary to press the second bearing 25 into the second bearing groove 27 of the motor rear cover 26, and press the resolver rotor 28 into the annular limiting groove 34 of the motor rear cover 26.

[0082] For the above-mentioned assembly, the assembly assembly device of the present invention is further provided with a first pressure sleeve 16, a second pressure sleeve 19, and a thrust rod 21 and a second adjusting nut 18 to assist in the pressing assembly.

[0083] The assembly device provided by this invention also includes a thrust rod 21. See also... Figure 3 The push rod 21 includes a head 23 and a cylindrical shaft 22. The outer diameter of the head 23 is larger than the outer diameter of the shaft 22, and a stepped surface is formed at the junction of the head 23 and the shaft 22.

[0084] See Figure 1 Two circular through holes 15 are symmetrically arranged on the middle wall of the guide portion 7 of the pull rod 1. The outer diameter of the rod body 22 of the thrust rod 21 is equal to the diameter of the circular through hole 15, so that the rod body 22 of the thrust rod 21 can pass through the two circular through holes 15 radially through the guide portion 7 of the pull rod 1; since the outer diameter of the rod head 23 is larger than the outer diameter of the rod body 22, that is, the outer diameter of the rod head 23 is larger than the diameter of the through hole 15 on the guide portion 7, when the thrust rod 21 passes through the guide portion 7 of the pull rod 1 radially, the rod head 23 is limited by the through hole 15, so that the thrust rod 21 is inserted into the guide portion 7 of the pull rod 1.

[0085] In this application, a thrust rod 21 is provided to prevent the pull rod 1 from rotating along with the adjusting nut during the tightening process. This thrust rod 21 balances the force on the pull rod 1's body 22 in the circumferential direction. Furthermore, to facilitate the use of the thrust rod 21, an anti-rotation groove 33 is provided on the operating table 32 that holds the main housing to be assembled. During preparation before press-fitting, the thrust rod 21 passes radially through the guide portion 7 of the pull rod 1 and is inserted into the anti-rotation groove 33 on the operating table 32. When the pull rod 1 is subjected to a circumferential force, the force exerted by the anti-rotation groove 33 on the thrust rod 21 balances this circumferential force, thereby preventing the pull rod 1 from rotating along with the adjusting nut.

[0086] The thrust rod 21 can control the pull rod 1 to remain stationary in the circumferential direction during the press-fitting process, ensuring the relative rotation between the adjusting nut and the pull rod 1, which plays a key role in effectively realizing the press-fitting process.

[0087] The components that directly achieve press fitting in the assembly assembly device provided by the present invention are the first pressure sleeve 16 and the second pressure sleeve 19.

[0088] This invention Figure 4 A schematic diagram of the structure of a first pressure sleeve 16 is provided. It can be seen that the first pressure sleeve 16 is a cylindrical sleeve. The middle sidewall of the sleeve is provided with a symmetrical waist-shaped groove 17 along the axial direction. The width of the waist-shaped groove 17 is equal to the inner diameter of the circular through hole 15. The inner diameter of the first pressure sleeve 16 is equal to the outer diameter of the guide portion 7. The length of the first pressure sleeve 16 is greater than the length of the guide portion 7, but less than the sum of the lengths of the guide portion 7 and the second threaded portion 8.

[0089] The first pressure sleeve 16 is used to press the second end 11 of the rotor shaft into the inner hole 35 of the first bearing. Specifically, the first pressure sleeve 16 is first inserted into the guide part 7 of the pull rod 1 until the first pressure sleeve 16 abuts against the first bearing 24. The positions of the waist-shaped groove 17 on the side wall of the first pressure sleeve 16 and the through hole 15 on the side wall of the guide part 7 are adjusted so that the waist-shaped groove 17 coincides with the through hole 15, that is, the through hole 15 is located below the groove of the waist-shaped groove 17. The push rod 21 is taken and passes through the waist-shaped groove 17 and the through hole 15 in sequence along a direction perpendicular to the plane of the operating table 32, and finally inserted into the anti-rotation groove 33 of the operating table 32. The rod head 23 of the push rod 21 is limited at the waist-shaped groove 17.

[0090] The second adjusting nut 18 is screwed into the second threaded portion 8. The second adjusting nut 18 is rotated clockwise. Since the thrust rod 21 can control the pull rod 1 and the first pressure sleeve 16 to remain stationary in the circumferential direction, that is, to control the pull rod 1 and the first pressure sleeve 16 not to rotate with the second adjusting nut 18; and since the main housing is fixed on the operating table 32, and the first bearing 24 that has been assembled into the main housing is also fixed, as the second adjusting nut 18 rotates, the second threaded portion 8 of the pull rod 1 is unscrewed. That is, the pull rod 1 drives the second end 11 of the rotor shaft to move along the central axis of the first bearing 24 towards the first bearing 24, until the second end 11 of the rotor shaft is pressed into the inner hole 35 of the first bearing.

[0091] During the above process, the second end 11 of the rotor shaft is subjected to tension; at the same time, since the first pressure sleeve 16 abuts against the first bearing 24, when the second adjusting nut 18 is rotated for pressing, the first pressure sleeve 16 generates pressure on the first bearing 24. This pressure, in conjunction with the tension on the pull rod 1, further promotes the pressing of the second end 11 of the rotor shaft into the inner hole 35 of the first bearing.

[0092] In addition, refer to Figure 4 The schematic diagram of the first pressure sleeve 16 shown in the figure shows that the waist-shaped groove 17 has a specific length along the length direction of the first pressure sleeve 16. Due to this specific length, even if the thrust rod 21 is displaced along the central axis under the action of the pull rod 1, the pull rod 1 can remain stationary in the circumferential direction through the cooperation of the thrust rod 21 and the waist-shaped groove 17. That is, the waist-shaped groove 17 provides space for the thrust rod 21 to move, thereby ensuring that the thrust rod 21 can play its role, that is, control the pull rod 1 to remain stationary in its circumferential direction.

[0093] This invention Figure 5 A schematic diagram of a second pressure sleeve 19 is provided. The second pressure sleeve 19 is a cylindrical sleeve with a flange, and four grooves 20 are equally spaced on the upper end face of the flange. The second pressure sleeve 19 is mainly used to press the second bearing 25 into the motor rear cover 26, and to press the resolver rotor 28 into the annular limiting groove 34 of the motor rear cover 26.

[0094] Before assembling the second bearing 25 and the resolver rotor 28 into the motor, the pressure plate 2 and the first adjusting nut 4 fixed to the connecting part 6 must be removed first, and the motor rear cover 26 must be installed into the main housing. Figure 6 As shown, the motor rear cover 26 is installed to the rear end of the main housing. The motor rear cover 26 has a second bearing groove 27 and an annular limiting groove 34, which are to be press-fitted into the second bearing 25 and the resolver rotor 28, respectively. The second bearing groove 27 and the annular limiting groove 34 coincide with the central axis of the first bearing groove 31.

[0095] When pressing in the second bearing 25, insert the second bearing 25 through the connecting part 6 until it abuts against the second bearing groove 27. Then, insert the second pressure sleeve 19 through the connecting part 6, and then insert the pressure plate 2 through the connecting part 6 until the lower end face of the flange of the pressure plate 2 abuts against the second pressure sleeve 19. Screw the first adjusting nut 4 into the first threaded part 5 and rotate the first adjusting nut 4 clockwise to push the pressure plate 2, and further push the lower end face of the flange of the pressure plate 2 against the second pressure sleeve 19, so that the second pressure sleeve 19 presses the second bearing 25 into the second bearing groove 27.

[0096] When pressing in the resolver rotor 28, first insert the resolver rotor 28 through the connecting part 6 until it abuts against the annular limiting groove 34. Then, insert the second pressure sleeve 19 through the connecting part 6 until the upper four grooves 20 of the second pressure sleeve 19 respectively mate with the four bosses on the surface of the resolver rotor 28. Insert the pressure plate 2 through the connecting part 6 until the lower end face of the flange of the pressure plate 2 abuts against the second pressure sleeve 19. Screw the first adjusting nut 4 into the first threaded part 5 and rotate the first adjusting nut 4 clockwise to push the pressure plate 2, and further push the lower end face of the flange of the pressure plate 2 against the second pressure sleeve 19, so that the resolver rotor 28 is pressed into the annular limiting groove 34 under the action of the second pressure sleeve 19.

[0097] Based on the above press-fitting process, since the second press sleeve 19 needs to be fitted onto the first end 10 of the rotor shaft, the inner diameter of the second press sleeve 19 is equal to the outer diameter of the first end 10 of the rotor shaft.

[0098] In summary, the assembly assembly device provided by the present invention includes a pull rod 1, a nylon positioning sleeve 3, a first adjusting nut 4, and a pressure plate 2 for supporting and guiding the rotor 14 into the inner cavity of the stator 30. Therefore, during the assembly of the rotor 14 and the stator 30, the rotor 14 can move stably and accurately along the direction of the central axis of the stator 30, which improves the controllability of the rotor-stator assembly, avoids the damage to the motor and the safety hazards to the operator caused by the magnetic attraction between the rotor and stator during the assembly process, and at the same time ensures the coaxiality of the rotor and stator in the motor.

[0099] Furthermore, this assembly assembly can also be used to complete the rotor-stator assembly process. The first pressure sleeve 16 in the assembly assembly can be used to press the second end 11 of the rotor shaft into the inner hole 35 of the first bearing. The second pressure sleeve 19 in the assembly assembly can be used to press the second bearing 25 into the second bearing groove 27 of the motor rear cover 26, and to press the resolver rotor 28 into the annular limiting groove 34 of the motor rear cover 26. During the pressing process, in order to prevent the components of the assembly assembly or the motor assembly from rotating with the adjusting nut, the assembly assembly is also provided with a thrust rod 21. Through holes 15 and waist-shaped grooves 17 are respectively provided on the guide part 7 of the pull rod 1 and the side wall of the first pressure sleeve 16 to cooperate with the use of the thrust rod 21, thereby controlling the pull rod 1 and the first pressure sleeve 16 to remain stationary in the circumferential direction.

[0100] The assembly and combination device provided by this invention can achieve the press-fitting of various motor components through the disassembly and assembly of multiple parts. The assembly and combination device can be flexibly adjusted according to the assembly of different motor components, thus achieving multi-functionality. In addition, using the same assembly and combination device to complete the assembly of multiple motor components can ensure the consistency of the assembly between motor components, that is, it can keep the assembled rotor 14, resolver rotor 28 and stator 30 coaxial, thereby improving the accuracy and reliability of the motor structure.

[0101] Based on the above-described assembly assembly device, this embodiment of the invention also provides a method for assembling an electric motor rotor, which uses the above-described assembly assembly device to assemble the electric motor.

[0102] The methods provided in the embodiments of the present invention will be further explained and described below.

[0103] This assembly method enables the assembly of the motor rotor 14 and stator 30, such as... Figure 7 As shown, the method includes:

[0104] Step 101: Fix the main housing of the motor onto the operating table 32. The main housing is equipped with the stator 30, so that the central axis of the stator 30 is parallel to the main surface of the operating table 32.

[0105] See Figure 6 The main motor housing includes an outer casing 29, a stator 30, and a first bearing 24. That is, before assembling the rotor 14, the stator 30 and the first bearing 24 have been assembled into the motor housing 29. Before assembling the rotor 14, the main housing is fixed on the operating table 32 for subsequent assembly.

[0106] Step 102: Connect the tie rod 1 and the rotor 14 to form a pre-assembled body.

[0107] The rotor 14 is fixed to the connecting part 6 of the tie rod 1 to form a pre-assembled body. Specifically, the rotor is inserted into the connecting part 6 of the tie rod 1 from the second end 11 of the rotor shaft until the end face of the second end 11 of the rotor shaft is in contact with the stepped surface 9 of the tie rod 1. The nylon positioning sleeve 3 fitted on the tie rod 1 is in contact with the inner wall of the second end 11 of the rotor shaft, so that the nylon positioning sleeve 3 can position the second end 11 of the rotor shaft radially. The pressure plate 2 is inserted into the connecting part 6 so that the cylinder of the pressure plate 2 is inserted into the shaft hole of the first end 10 of the rotor shaft. The first adjusting nut 4 is screwed into the first threaded part 5. The first adjusting nut 4 is adjusted to push the pressure plate 2 and make the lower end face of the flange of the pressure plate 2 in contact with the end face of the first end 10 of the rotor shaft, so that the rotor shaft 12 is fixed to the connecting part 6.

[0108] Step 103: Push the pre-assembled assembly into the main shell.

[0109] First, insulating paper is laid on the inner wall of the stator 30 to prevent the rotor 14 and the stator 30 from directly contacting and bumping each other during the pushing process; the pre-assembled body is lifted horizontally and adjusted to balance using a lifting tool, and one end of the guide part 7 in the pre-assembled body is sent into the inner cavity of the stator 30 in the horizontal direction until the guide part 7 penetrates into the inner hole 35 of the first bearing in the main housing. Since the outer diameter of the guide part 7 is equal to the inner diameter of the inner hole 35 of the first bearing, the inner hole 35 of the first bearing limits the guide part 7 in the radial direction; the pre-assembled body is pushed, and the rotor 14 in the pre-assembled body is sent into the inner cavity of the stator 30 at a controllable speed under the guidance of the guide part 7.

[0110] During the above process, the guide part 7 of the pull rod 1 guides the rotor 14, which is fixed to the connecting part 6, to stably enter the inner cavity of the stator 30 along the direction of the central axis of the inner hole 35 of the first bearing. This improves the controllability of rotor-stator assembly, avoids damage to the motor and safety hazards to operators caused by the magnetic attraction between the rotor and stator during the assembly process, and also ensures the coaxiality of the rotor and stator in the motor.

[0111] The assembly assembly also includes a first pressure sleeve 16, a second adjusting nut 18, and a thrust rod 21. These components work in conjunction with the tie rod 1 to achieve further press-fitting between the rotor and the stator, that is, pressing the second end 11 of the rotor shaft into the inner hole 35 of the first bearing. The specific assembly method is as follows: Figure 8 As shown, the assembly method provided by the present invention further includes the following steps:

[0112] Step 201: Insert the first pressure sleeve 16 into the guide part 7 of the pull rod 1 until the first pressure sleeve 16 abuts against the first bearing 24.

[0113] Step 202: Insert the thrust rod 21 into the waist-shaped groove 17 of the first pressure sleeve 16, the through hole 15 of the guide part 7 of the pull rod 1, and the corresponding anti-rotation groove 33 on the operating table 32 in sequence.

[0114] Adjust the position of the waist-shaped groove 17 on the side wall of the first pressure sleeve 16 and the through hole 15 on the guide side wall so that the waist-shaped groove 17 coincides with the through hole 15, that is, so that the through hole 15 is located below the groove of the waist-shaped groove 17. Take the push rod 21 and pass it through the waist-shaped groove 17 and the through hole 15 in a direction perpendicular to the plane of the operating table 32, and finally insert it into the anti-rotation groove 33 of the operating table 32. The rod head 23 of the push rod 21 is limited at the waist-shaped groove 17.

[0115] Step 203: Screw the second adjusting nut 18 into the second threaded part 8, rotate the second adjusting nut 18 clockwise, and press the second end 11 of the rotor shaft into the inner hole 35 of the first bearing.

[0116] Take the second adjusting nut 18 and screw it into the second threaded part 8. Rotate the second adjusting nut 18 clockwise. Since the thrust rod 21 can control the pull rod 1 to remain stationary in the circumferential direction, that is, control the pull rod 1 not to rotate with the second adjusting nut 18; and since the main housing is fixed on the operating table 32, and the first bearing 24 that has been assembled into the main housing is also fixed, as the second adjusting nut 18 rotates, the second threaded part 8 of the pull rod 1 is unscrewed, that is, the torsional force is converted into a pulling force acting on the pull rod 1, causing the pull rod 1 to drive the second end 11 of the rotor shaft to move along the central axis of the first bearing 24 towards the first bearing 24, until the second end 11 of the rotor shaft is pressed into the inner hole 35 of the first bearing.

[0117] The above process involves combining the first pressure sleeve 16 and the second adjusting nut 18 with the pull rod 1, so that the second end 11 of the rotor shaft is pressed into the inner hole 35 of the first bearing. At the same time, in order to prevent the pull rod 1 and the first pressure sleeve 16 from rotating in the circumferential direction under the torsional force of the second adjusting nut 18, the thrust rod 21 is engaged with the through hole 15 of the guide part 7 of the pull rod 1 and the waist-shaped groove 17 of the first pressure sleeve 16 to control the pull rod 1 and the first pressure sleeve 16 to remain stationary in the circumferential direction.

[0118] The assembly assembly also includes a second pressure sleeve 19, which is used to press the second bearing 25 into the second bearing groove 27 of the motor rear cover 26. The second pressure sleeve 19 can also be used to press the resolver rotor 28 into the annular limiting groove 34 of the motor rear cover 26. Specific assembly methods are as follows: Figure 9 As shown in Figure 10.

[0119] Among them, see Figure 9 and combined Figure 6 Pressing the second bearing 25 into the motor rear cover 26 includes the following steps:

[0120] Step 301: Remove the pressure plate 2 and the first adjusting nut 4 fixed to the connecting part 6, and install the motor rear cover 26 onto the main housing.

[0121] Before installing the motor rear cover 26, the pressure plate 2 and the first adjusting nut 4 fixed to the connecting part 6 need to be removed first. Then, insert the motor rear cover 26 through one end of the connecting part 6 of the pull rod 1, as follows: Figure 6 As shown, the motor rear cover 26 is installed to the rear end of the main housing. The motor rear cover 26 has a second bearing groove 27 and an annular limiting groove 34, which are to be press-fitted into the second bearing 25 and the resolver rotor 28, respectively. The second bearing groove 27 coincides with the central axis of the first bearing groove 31.

[0122] Step 302: Insert the second bearing 25 into the connecting part 6 of the tie rod 1.

[0123] Insert the second bearing 25 to be assembled from one end of the connecting part 6 of the tie rod 1 until it abuts against the second bearing groove 27.

[0124] Step 303: Insert the second pressure sleeve 19 and the pressure plate 2 into the connecting part 6 of the pull rod 1 in sequence.

[0125] When installing pressure plate 2, pressure plate 2 needs to be pushed until the lower end face of the flange of pressure plate 2 abuts against the second pressure sleeve 19.

[0126] Step 304: Screw the first adjusting nut 4 into the first threaded part 5, and rotate the first adjusting nut 4 clockwise so that the second bearing 25 is pressed into the second bearing groove 27 under the action of the second pressure sleeve 19.

[0127] Rotate the first adjusting nut 4, and at the same time, the first adjusting nut 4 pushes the pressure plate 2, so that the lower end face of the flange of the pressure plate 2 moves further forward to push the second pressure sleeve 19, so that the second pressure sleeve 19 presses the second bearing 25 into the second bearing groove 27.

[0128] In addition, see Figure 10 and combined Figure 6 Pressing the resolver rotor 28 into the motor rear cover 26 may include the following steps:

[0129] Step 401: Remove the second pressure sleeve 19, pressure plate 2 and first adjusting nut 4 fixed to the connecting part 6, and insert the resolver rotor 28 into the connecting part 6 of the pull rod 1.

[0130] Before pressing, the second pressure sleeve 19, pressure plate 2 and first adjusting nut 4 used to press the second bearing 25 in the previous process need to be removed, and the resolver rotor 28 to be assembled is inserted into the connecting part 6 of the pull rod 1 until the resolver rotor 28 abuts against the annular limiting groove 34, and then the resolver rotor 28 is pressed into the annular limiting groove 34.

[0131] Step 402: Insert the second pressure sleeve 19 and the pressure plate 2 into the connecting part 6 of the pull rod 1 in sequence.

[0132] When installing the second pressure sleeve 19, the four grooves 20 on the second pressure sleeve 19 are respectively matched with the four bosses on the surface of the resolver rotor 28; when installing the pressure plate 2, the pressure plate 2 needs to be pushed until the lower end face of the flange of the pressure plate 2 abuts against the second pressure sleeve 19.

[0133] Step 403: Screw the first adjusting nut 4 into the first threaded part 5, and rotate the first adjusting nut 4 clockwise so that the resolver rotor 28 is pressed into the annular limiting groove 34 under the action of the second pressure sleeve 19.

[0134] Rotate the first adjusting nut 4, and at the same time, the first adjusting nut 4 pushes the pressure plate 2, so that the lower end face of the flange of the pressure plate 2 moves further forward to push the second pressure sleeve 19, so that the second pressure sleeve 19 presses the resolver rotor 28 into the annular limiting groove 34.

[0135] The above process, through the combined action of the second pressure sleeve 19 and the first adjusting nut 4, converts the torsional force of the first adjusting nut 4 into pressure acting on the motor assembly (i.e., the second bearing 25 or the resolver rotor 28), thereby realizing the pressing of the second bearing 25 into the second bearing groove 27 of the motor rear cover 26 and the pressing of the resolver rotor 28 into the annular limiting groove 34 of the motor rear cover 26.

[0136] As can be seen, the assembly method provided by this invention can not only be used for the assembly between the motor rotor and stator, but also for pressing other motor components in subsequent motor assembly processes. Therefore, the assembly method provided by this invention can realize the pressing of various motor components, and the assembly assembly device can be flexibly adjusted according to the assembly of different motor components, achieving multi-functionality. In addition, using the same assembly assembly device to complete the assembly of multiple motor components can ensure the consistency of the assembly between motor parts, that is, it can keep the assembled rotor, bearings, and resolver rotor coaxial with the stator, thereby improving the accuracy and reliability of the motor structure.

[0137] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0138] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0139] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An assembly and assembly device for an electric motor rotor, characterized in that, The assembly assembly includes: a pull rod (1), a pressure plate (2), a nylon positioning sleeve (3), a first adjusting nut (4), a first pressure sleeve (16), a second adjusting nut (18), and a thrust rod (21). The pull rod (1) includes, in sequence along its length, a first threaded portion (5), a connecting portion (6), a guide portion (7), and a second threaded portion (8). The outer diameter of the connecting portion (6) is smaller than the outer diameter of the guide portion (7). A stepped surface (9) is formed at the junction of the connecting portion (6) and the guide portion (7). The connecting portion (6) is used to pass through the hollow rotor shaft (12) of the rotor (14) of the motor. The guide portion (7) is used to pass through the inner hole (35) of the first bearing in the main housing of the motor. The nylon positioning sleeve (3) is fitted on the connecting part (6), and the lower end face of the nylon positioning sleeve (3) is in contact with the stepped surface (9). The nylon positioning sleeve (3) is used to position the hollow rotor shaft (12) in the radial direction. The pressure plate (2) is a hollow cylinder with a flange, and the inner diameter of the cylinder is larger than the outer diameter of the first threaded part (5). The internal thread of the first adjusting nut (4) mates with the external thread of the first threaded part (5); The first pressure sleeve (16) is a cylindrical sleeve. The middle side wall of the sleeve is provided with a symmetrical waist-shaped groove (17) along the axial direction. The inner diameter of the first pressure sleeve (16) is equal to the outer diameter of the guide part (7). The length of the first pressure sleeve (16) is greater than the length of the guide part (7) and less than the sum of the lengths of the guide part (7) and the second threaded part (8). The internal thread of the second adjusting nut (18) is engaged with the external thread of the second threaded part (8). The thrust rod (21) includes a rod head (23) and a cylindrical rod body (22). Two circular through holes (15) are symmetrically arranged on the middle rod wall of the guide part (7). The thrust rod (21) can pass through the guide part (7) radially through the two through holes (15) and be limited at the through holes (15). The outer diameter of the rod head (23) is larger than the outer diameter of the rod body (22). A stepped surface is formed at the intersection of the rod head (23) and the rod body (22). The outer diameter of the rod body (22) is equal to the inner diameter of the through hole (15). The width of the waist-shaped groove (17) is equal to the inner diameter of the through hole (15).

2. The assembly and combination device according to claim 1, characterized in that, The assembly assembly also includes a second pressure sleeve (19), which is a cylindrical sleeve with a flange. The surface of the flange includes two opposing end faces, wherein four grooves (20) are equally spaced along the circumference on the end face away from the cylindrical sleeve.

3. A method for assembling an electric motor rotor, characterized in that, The method uses the assembly assembly device according to claim 2 to assemble the rotor (14), the method comprising: The main housing of the motor is fixed on the operating table (32) so that the central axis of the stator (30) assembled inside the main housing is parallel to the main surface of the operating table (32); Connecting the pull rod (1) and the rotor (14) to form a pre-assembled body includes: inserting the second end (11) of the rotor shaft into the connecting part (6) of the pull rod (1) until the end face of the second end (11) of the rotor shaft is in contact with the stepped surface (9) of the pull rod (1), while the nylon positioning sleeve (3) fitted on the pull rod (1) is also in contact with the inner wall of the second end (11) of the rotor shaft, so that the nylon positioning sleeve (3) can position the second end (11) of the rotor shaft radially; and removing the pressure plate (2) from the... The connecting part (6) is inserted, so that the cylinder of the pressure plate is inserted into the shaft hole of the first end (10) of the rotor shaft; the first adjusting nut (4) is screwed into the first threaded part (5), and the first adjusting nut (4) is rotated clockwise to push the pressure plate (2), so that the cylinder of the pressure plate (2) is completely inserted into the shaft hole of the first end (10) of the rotor shaft, and the lower end face of the flange of the pressure plate (2) is in contact with the end face of the first end (10) of the rotor shaft, so that the rotor shaft (12) is fixed in the connecting part (6); Pushing the pre-assembled assembly into the main housing includes: first, laying insulating paper on the inner wall of the stator (30) to avoid direct contact between the rotor (14) and the stator (30) during the pushing process, causing collisions; using a lifting tool to horizontally lift the pre-assembled assembly and adjust it to balance, and continuing to send one end of the guide part (7) in the pre-assembled assembly into the inner cavity of the stator (30) in the horizontal direction until the guide part (7) penetrates into the first bearing inner hole (35) of the first bearing (24) already assembled in the main housing, and the first bearing inner hole (35) limits the guide part (7) radially; continuing to push the pre-assembled assembly, and the rotor (14) in the pre-assembled assembly is sent into the inner cavity of the stator (30) under the guidance of the guide part (7).

4. The assembly method according to claim 3, characterized in that, The assembly method further includes pressing the second end (11) of the rotor shaft into the inner hole (35) of the first bearing, including: Insert the first pressure sleeve (16) into the guide portion (7) until the first pressure sleeve (16) abuts against the first bearing (24); The thrust rod (21) is sequentially inserted into the waist-shaped groove (17) of the first pressure sleeve (16), the through hole (15) of the pull rod (1), and the anti-rotation groove (33) correspondingly opened on the operating table (32), including: adjusting the position of the waist-shaped groove (17) on the side wall of the first pressure sleeve (16) and the through hole (15) on the side wall of the guide part (7) so that the through hole (15) is located below the slot of the waist-shaped groove (17), so that the thrust rod (21) passes through the waist-shaped groove (17) and the through hole (15) in a direction perpendicular to the plane of the operating table (32), and finally inserts into the anti-rotation groove (33) correspondingly opened on the operating table (32), wherein the rod head (23) of the thrust rod (21) is limited at the waist-shaped groove (17); Screw the second adjusting nut (18) into the second threaded part (8), and rotate the second adjusting nut (18) clockwise so that the pull rod (1) drives the second end (11) of the rotor shaft to move along the central axis of the first bearing (24) towards the first bearing (24), thereby pressing the second end (11) of the rotor shaft into the inner hole (35) of the first bearing.

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