Multi-positioning mode permanent magnet motor stator hot assembly device and assembly method

Abstract

The application provides a multi-positioning mode permanent magnet motor stator hot assembly device and an assembly method. A stator assembly hoisting tool is designed by using an electromagnet principle, lossless hoisting of the stator assembly is realized, damage of parts or personnel caused by difficulty in hoisting of the stator assembly with large size and weight is avoided, the axis of the motor stator assembly and the shell can be precisely realized to be coaxial and key positioning, and assembly difficulty caused by the axis of the stator assembly and the shell being non-coaxial or the key being misaligned is avoided. The application has the advantages of simple structure, low cost, easy realization process, simple and easy operation, high work efficiency and improved production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet synchronous servo motor manufacturing, and specifically relates to a thermal assembly device and assembly method for the stator of a multi-positioning permanent magnet motor with large volume and weight. Background Technology

[0002] Permanent magnet synchronous servo motors are a type of brushless motor. Their main structure consists of a wound stator, a permanent magnet rotor, and supporting end caps and housings. The stator of this type of motor is generally assembled from a stator assembly with wound coils and a supporting housing, facilitating heat dissipation. The permanent magnets are bonded to the rotor, eliminating energized windings, resulting in virtually no losses and heat generation, and high efficiency. The motor has a wide power range, capable of producing very high power outputs; it also has high inertia and a low maximum speed, which decreases rapidly with increasing power, making it suitable for low-speed, stable operation applications. Furthermore, the motor offers advantages such as maintenance-free operation, high efficiency, low operating temperature, minimal electromagnetic radiation, and long lifespan, making it suitable for various environments and widely used in aerospace, aviation, and other defense fields, as well as high-end civilian applications such as new energy vehicles.

[0003] Considering that the output torque of the motor shaft will exert a reaction force on the stator winding coils during motor operation, to prevent circumferential rotation between the stator assembly and the housing, the stator assembly and housing can be bonded together using a clearance fit and adhesive, or an interference fit can be used to heat-fit or press-fit the stator assembly into the housing. After assembly, set screws are drilled and installed for structural reinforcement. If the motor has sealing requirements, a key positioning + interference fit method is used to ensure that circumferential rotation between the housing and the stator assembly does not occur during motor operation. A typical structure is shown in the appendix. Figure 1Compared to the potential damage to the housing caused by press fitting, a hot-fitting process is often used when the interference fit is large. This involves heating the motor housing to a certain temperature to expand its inner diameter, then inserting the cooled stator assembly into the motor housing cavity with a gap, assembling it in place. After the motor housing cools, its inner diameter shrinks, forming an interference fit with the stator assembly. In this case, it is necessary to ensure both axial positioning and key positioning between the stator assembly and the housing, making it a multi-positioning assembly with significant assembly difficulty. Furthermore, the stator assembly is composed of enameled wire wound into stator core slots and impregnated with enamel. The inner and outer walls of the core are cylindrical; if the weight is large, for example exceeding 20 kg, manual handling becomes impossible. The stator core is made of stacked silicon steel sheets. Drilling lifting holes will affect the magnetic conductivity of the stator core and the insulation between the silicon steel sheets, causing increased eddy current losses and magnetic field distortion, which will seriously affect the motor performance. Furthermore, the slots contain embedded enameled wires; if the enameled wires are damaged, the stator assembly will be damaged and scrapped. Therefore, the stator assembly cannot be assembled by lifting. An assembly method must be considered that can simultaneously achieve component axis positioning and key positioning without damaging the stator assembly.

[0004] Micromotors, due to the small size and weight of their components, can be assembled manually using specialized tooling. The assembly process is mature and widely used in various motor manufacturers. A novelty search revealed two patents: "A Large Motor Assembly Tooling" (application number: CN201720093868, patentee: Hangzhou Wahaha Precision Machinery Co., Ltd.) and "A Large Motor Stator Installation Structure and Method" (application number: CN201410793831, patentee: Chongqing Sailimeng Motor Co., Ltd.). These primarily target motors with stators and rotors weighing between 50 and 90 tons, using overhead cranes for hoisting. While these assembly methods are applicable to motor components weighing between 50 and 90 tons, primarily addressing the hoisting of very heavy motor components, they do not address the multi-positioning over-fitting assembly of permanent magnet synchronous DC motor stator assemblies weighing several hundred kilograms to the motor housing.

[0005] With the increasing demand for high-power permanent magnet synchronous motors in servo control and drive systems, there is a growing number of permanent magnet synchronous DC motor models with output power ranging from tens to hundreds of kilowatts and a total weight of several hundred kilograms. Consequently, the weight of motor components is also increasing. Unlike the assembly of smaller micro-motors or large motors weighing tons, there are no mature and effective methods and processes for the production and assembly of these types of motors. Micro-motors, due to their relatively light stators and rotors, can be installed manually using simple tooling; while large motors are widely assembled using specialized equipment such as overhead cranes. Motors with output power ranging from tens to hundreds of kilowatts and a total weight of several hundred kilograms have heavier components, making manual assembly impossible. However, compared to large motors, their size and weight are relatively small. Furthermore, the fit between the stator assembly and the housing is typically H7 / s6, meaning the interference is generally 0.1mm. If specialized equipment such as overhead cranes is used for hoisting, the hoisting height and sling sway make it difficult to achieve coaxial alignment between the stator assembly and the housing. Meanwhile, in order to ensure the assembly requirements based on interference fit without damaging the motor stator assembly and housing, rapid positioning assembly is required when the motor housing is hot (generally, the hot assembly time should be controlled within 3 to 5 seconds). The swing of the sling makes it difficult for operators to complete rapid interference fit assembly with multiple positioning methods such as axial centering and key positioning when the motor housing is hot. Summary of the Invention

[0006] To address the issues of large stator weight, multiple positioning methods, and inability to be manually operated in this type of permanent magnet synchronous motor, and to overcome the difficulties caused by the large weight of the stator assembly making hand operation impossible, thus avoiding safety hazards such as component damage and personnel injury, this invention proposes a large-volume and heavy multi-positioning method permanent magnet motor stator thermal assembly device and assembly method. It is simple and easy to implement, and the test device has the advantages of good coaxiality, no special requirements for the production site, simple structure, easy implementation, convenient operation, safety and reliability, and time and labor saving.

[0007] A multi-positioning permanent magnet motor stator thermal assembly device, including an electromagnetic hoisting fixture for stator components and an internal positioning and guiding fixture for the housing;

[0008] The stator assembly electromagnetic lifting fixture includes an electromagnetic lifting base, an electromagnetic chuck, lifting eye bolts, and a solenoid. The electromagnetic lifting base is made of magnetically conductive material, with an internal cavity and an external solenoid. The electromagnetic chuck is also made of magnetically conductive material, located within the cavity of the electromagnetic lifting base, and is clearance-fitted. The portion of the electromagnetic chuck extending out of the cavity is arc-shaped to facilitate contact with the inner wall of the object being lifted. The lifting eye bolts are fixed to the outer wall of the electromagnetic lifting base for easy lifting.

[0009] The internal positioning and guiding fixture includes a positioning and guiding fixture with half-key positioning and interference fit and a positioning and guiding fixture with full-key positioning and interference fit.

[0010] The positioning guide fixture with semi-key positioning and interference fit includes a motor positioning guide shaft and a process positioning key. The inner diameter of the guide shaft is the same as the outer diameter of the stator core for guiding and positioning. The inner wall of the motor positioning guide shaft is designed with a keyway. After the process positioning key is fixed to the motor positioning guide shaft, it serves as the key positioning alignment reference.

[0011] The positioning guide fixture with full key positioning and interference fit has a keyway on the inner wall of the guide shaft, without adding process keys, and uses the keyway as the alignment reference for key positioning.

[0012] Furthermore, the guide shaft of the semi-key positioning + interference fit positioning guide tool is designed with a sloped guide section at the front end of the inner cavity to facilitate the centering and positioning of the stator assembly.

[0013] Furthermore, the inner cavity of the electromagnetic hoisting base has a keyway.

[0014] Furthermore, the electromagnetic chuck is a one-piece molded part, with an overall square shape, one end being an arc-shaped end, and the other end engaging with the keyway of the electromagnetic hoisting base for positioning.

[0015] Furthermore, the outer diameter of the arc-shaped end of the electromagnetic chuck is consistent with the inner cavity size of the stator assembly, ensuring that it can fit tightly and reliably adhere to the stator assembly.

[0016] Furthermore, there are two electromagnetic chucks with identical structures; the square ends are inserted into the inner cavity of the electromagnetic lifting base, and the square end faces of the two electromagnetic chucks do not contact each other; the square part of the electromagnetic chuck can slide axially within the cavity of the electromagnetic lifting base.

[0017] The assembly method for a multi-positioning permanent magnet motor stator thermal assembly device, when assembling a stator with semi-key positioning and interference fit, includes the following steps:

[0018] Step 1: Lower the entire electromagnetic hoisting fixture of the stator assembly into the inner cavity of the stator assembly to be assembled using the hoisting eye bolts, wherein the positioning key is embedded in the keyway of the stator assembly;

[0019] Step 2: Insulate the motor housing with heat, and then remove the housing; place the positioning guide fixture inside the housing onto the motor housing, ensuring that the keyway of the positioning guide fixture inside the housing is aligned with the keyway of the motor housing.

[0020] Step 3: Power on the stator assembly hoisting fixture. After power is applied, the solenoid generates a magnetic field. After the magnetic field is generated, the electromagnetic chuck adheres to and attracts the inner cavity of the stator assembly.

[0021] Step 4: Use slings to lift the stator assembly and place it into the inner cavity of the positioning guide fixture inside the housing. After placement, ensure that the positioning key on the stator assembly falls into the keyway of the positioning guide fixture inside the housing.

[0022] Step 5: Using slings, guide the motor stator assembly to be assembled into the motor housing cavity. After the motor stator assembly is fully installed in the motor housing, remove the positioning guide fixture inside the housing, disconnect the power supply to the stator assembly electromagnetic lifting fixture, and the solenoid will no longer generate a magnetic field. Remove the stator assembly electromagnetic lifting fixture; assembly is complete. When assembling a stator with full key positioning and interference fit, the following steps are included:

[0023] Step 1: Lower the entire electromagnetic hoisting fixture of the stator assembly into the inner cavity of the stator assembly to be assembled using the hoisting eye bolts;

[0024] Step 2: Insulate the motor housing with heat, and then remove the housing; fix the process positioning key to the positioning guide fixture inside the housing with screws, and then place the positioning guide fixture inside the housing on the motor housing. The process positioning key of the positioning guide fixture inside the housing should be aligned with the keyway of the motor housing and fall into the keyway of the motor housing.

[0025] Step 3: Power on the stator assembly hoisting fixture. After power is applied, the solenoid generates a magnetic field. After the magnetic field is generated, the electromagnetic chuck adheres to and attracts the inner cavity of the stator assembly.

[0026] Step 4: Use slings to lift the stator assembly and place it into the inner cavity of the positioning guide fixture inside the housing. After placement, the process positioning key of the positioning guide fixture inside the housing must be placed in the keyway on the stator assembly.

[0027] Step 5: Using sling hoisting, guide the motor stator assembly to be assembled into the inner cavity of the motor housing. After the motor stator assembly is fully installed in the motor housing, remove the positioning guide fixture inside the housing, disconnect the power supply of the stator assembly electromagnetic hoisting fixture, and the solenoid will no longer generate a magnetic field. Remove the stator assembly electromagnetic hoisting fixture.

[0028] Step 6: Press the positioning key into the keyway between the stator assembly and the motor housing according to the motor design drawings. Once the assembly is in place, the assembly is complete.

[0029] Invention Effects

[0030] The technical advantages of this invention are as follows: This invention solves the problems of excessive weight of motor stator components with output power of several hundred kilowatts and weight of several hundred kilograms, which makes them difficult to operate by hand and difficult to assemble due to multiple positioning methods. The device has a simple structure that is easy to process, a reasonable and effective process flow plan, and convenient and quick operation during assembly. It can be applied to the stator assembly of permanent magnet synchronous motors of various specifications with large volume and weight and multiple positioning methods, ensuring the production of motor products.

[0031] The products targeted by this invention are much smaller than those targeted by existing technologies. It is suitable for stator assembly with multiple positioning methods. The assembly process uses a self-designed device, which does not require special equipment such as overhead cranes. It is easy to operate, safe and reliable, has a wide range of applications, and has low requirements for production sites.

[0032] The specific advantages are as follows:

[0033] 1) The stator of a permanent magnet synchronous DC motor can be assembled using a simple device. The method is simple, easy to implement, convenient and effective.

[0034] 2) The installation and positioning are accurate, which can accurately realize the coaxiality of the motor stator assembly and the housing and the key positioning and alignment, avoiding assembly difficulties caused by the misalignment of the stator assembly and the housing axis or the misalignment of the key;

[0035] 3) The stator assembly hoisting fixture is designed using the principle of electromagnets, which enables non-destructive hoisting of the stator assembly and avoids damage to parts or personnel caused by the difficulty in hoisting stator assemblies weighing tens to hundreds of kilograms.

[0036] 4) The device has a simple structure, low cost, easy implementation process, and low requirements for the operating site;

[0037] 5) The equipment is easy to operate and highly efficient, thus improving production efficiency;

[0038] 6) It is applicable to a wide range of frame sizes, is flexible and mobile, and can change the lifting weight of the electromagnet by changing the number of turns of the electromagnet coil, adjusting the working voltage, etc. It can be applied to various frame sizes by changing the inner and outer diameters of the positioning heat sleeve guide tool.

[0039] This invention can be applied to the development and production of stators for various types of large-volume and heavy permanent magnet synchronous DC motors with multiple positioning methods. Attached Figure Description

[0040] Appendix Figure 1 Typical structure diagram of permanent magnet synchronous DC motor stator, where (a) is half key + interference fit, and (b) is full key + interference fit.

[0041] Appendix Figure 2 A schematic diagram of the electromagnetic hoisting fixture structure, where (a) is the front view, (b) is the sectional view, and (c) is the side view of (b).

[0042] Appendix Figure 3Schematic diagrams of the internal positioning heat-shrinking guide fixture structure, wherein (a) is a schematic diagram of a heat-shrinking guide fixture structure with half-key positioning and interference fit based on the outer mounting surface of the housing, (b) is a schematic diagram of a heat-shrinking guide fixture structure with full-key positioning and interference fit based on the outer mounting surface of the housing, (c) is a schematic diagram of a heat-shrinking guide fixture structure with half-key positioning and interference fit based on the inner mounting surface of the housing, and (d) is a schematic diagram of a heat-shrinking guide fixture structure with full-key positioning and interference fit based on the inner mounting surface of the housing.

[0043] Appendix Figure 4 A schematic diagram of the stator assembly process with semi-key positioning and interference fit, where (a) is the preparation stage, (b) is the hoisting process, (c) is the assembly in place, and (d) is the finished stator assembly.

[0044] Explanation of reference numerals in the attached drawings: 1-Electromagnetic lifting base, 2-Electromagnetic chuck, 3-Lifting eye bolt, 4-Solenoid, 5-Motor housing, 6-Locking key, 7-Stator assembly, 8-Motor positioning guide shaft, 9-Process positioning key, 10-Fasting screw, 11-Housing positioning guide shaft, 12-Stator assembly electromagnetic lifting fixture, 13-Housing internal positioning guide fixture. Detailed Implementation

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] See Figures 1-4 The technical solution of this invention is to design a thermal assembly device and assembly method for a multi-positioning permanent magnet motor stator with a large volume and weight. This device consists of an electromagnetic hoisting fixture for the stator assembly and a positioning and guiding fixture inside the housing.

[0047] First, based on the internal cavity mounting dimensions of the motor stator assembly and the weight of the workpiece, an electromagnetic lifting fixture was designed. A schematic diagram of the electromagnetic lifting fixture structure is attached. Figure 2 It includes an electromagnetic lifting base, electromagnetic chuck, lifting eye bolts, and solenoid.

[0048] The electromagnetic base is made of magnetically conductive electrical pure iron, and the iron core has a rectangular structure.

[0049] The electromagnetic chuck is made of magnetically conductive electrical pure iron. The electromagnetic chuck consists of two parts: the main body is a cuboid structure, and one end is an arc-shaped head. The outer diameter of the arc is the same as the inner diameter of the stator core to be assembled. When in use, it fits more tightly with the stator core and can better play its role in magnetic conduction.

[0050] The electromagnetic chuck is connected to the electromagnetic base via a keyed positioning and clearance fit. A small-clearance sliding fit or clearance positioning fit can be used between the electromagnetic base and the electromagnetic chuck, typically employing tolerances of H7, H8, H9 and g6, h6, h7. The clearance should be as small as possible to ensure a uniform magnetic field within the air gap. The arc-shaped outer diameter of both electromagnetic chuck parts matches the inner cavity size of the stator assembly, ensuring a tight and reliable adhesion. A small gap is reserved between the two chucks to facilitate smooth insertion into the stator assembly cavity.

[0051] The solenoid is wound around the electromagnetic base and generates electromagnetic force when energized. In use, slings are attached to the two eye bolts, the electromagnetic lifting fixture is inserted into the stator core cavity, and when energized, the solenoid generates electromagnetic force. The two electromagnetic chucks slide inside the electromagnetic base and are tightly attracted to the inner wall of the stator core, achieving non-destructive lifting of the stator assembly.

[0052] The enameled wire is wound around the outer circumference of the electromagnetic base. The larger the size of the electromagnet core (including the electromagnetic base and electromagnetic chuck), the greater the current passing through the solenoid, and the greater the electromagnetic attraction force that can be generated.

[0053] By considering the power supply type and voltage, as well as the design parameters such as the enameled wire diameter, number of turns, and cross-sectional area of ​​the electromagnet core, the lifting weight of the electromagnetic lifting fixture can be adjusted as needed. Two threaded holes are designed on the electromagnetic base for installing eye bolts, facilitating the installation of slings during subsequent operations.

[0054] See attached schematic diagram of the internal positioning heat-guided tooling structure. Figure 3 a) and c) are suitable for stator assembly with partial key positioning and interference fit, and the structure includes a guide shaft, a process positioning key, and fastening screws; b) and d) are suitable for stator assembly with full key positioning and interference fit. The guide shaft uses the outer or inner wall of the housing as the positioning reference, and the inner cavity is consistent with the outer diameter of the stator core for guiding and positioning. A sloped guide section is designed and machined at the front end of the inner cavity to facilitate the centering and positioning of the stator assembly. The slope of the guide section is generally designed to be 1° to 5°, and the length is preferably 1 / 3 of the axial length of the stator assembly to be assembled. To accommodate key positioning assembly, a keyway is designed on the inner wall of the guide shaft. The guide fixtures suitable for stator assembly with partial key positioning and interference fit are attached. Figure 3 As shown in a) and c), the process locating key, after being fixed, serves as the key positioning alignment reference. The fastening screws are used to secure the process locating key and the guide shaft. The guide fixture suitable for stator assembly with full key positioning and interference fit is shown in the attached figure. Figure 3As shown in b) and d), a keyway is cut on the inner wall of the guide shaft according to the keyway positioning relationship of the housing. No process key is added, and the keyway is used as the alignment datum for key positioning. The design of the internal positioning heat-fitting guide tooling is very flexible. For example, if the motor housing is circular, the outer wall of the motor housing can be used as the guide positioning datum during the design, as shown in the attached figure. Figure 3 As shown in a) and b); if the shape of the motor housing is not conducive to positioning (such as polygonal, asymmetrical, or irregular shapes), then the area where the housing cavity mates with the end cover is used as a guide for positioning, as shown in the attached figure. Figure 3 As shown in c) and d).

[0055] Subsequently, based on the shape of the housing to be assembled and the assembly method between the housing and the stator assembly (semi-key positioning + interference fit or full key positioning + interference fit), an internal positioning and guiding fixture is designed. The structure of the internal positioning and guiding fixture is as follows: Figure 3 As shown. If the stator assembly and housing are fitted with a keyed joint and an interference fit, then only the positioning guide shaft inside the housing needs to be designed, as shown in the attached diagram. Figure 3 As shown in b) and d). The inner diameter of the guide shaft is the same as the outer diameter of the stator assembly, and a clearance fit with very small sliding is selected; a bevel is designed at the upper end to facilitate quick alignment of the stator assembly during hot fitting; a keyway is opened on the inner wall of the guide shaft, and the width and depth of the keyway are the same as the keyway on the housing; the fit between the guide shaft and the housing can be determined according to the shape of the housing, using the outer or inner locating surface of the housing for positioning. If the fit between the stator assembly and the housing is a semi-key positioning + interference fit, the internal positioning guide tooling structure of the housing is as shown in the attached figure. Figure 3 As shown in a) and c), the design concept of the guide shaft is consistent with the full key positioning + interference fit method, with the addition of a process positioning key. The structural dimensions of the process positioning key are the same as those of the product positioning key, serving as a guide for key positioning. The inner cavity of the guide shaft is consistent with the outer diameter of the stator assembly, and a clearance fit with very small sliding is selected. A bevel is designed at the upper end to facilitate rapid alignment of the stator assembly during hot fitting. The fit between the guide shaft and the housing can be determined according to the shape of the housing, using either the outer or inner positioning surface of the housing for positioning.

[0056] For larger and heavier multi-position permanent magnet synchronous servo motors, when the stator is assembled using a semi-key positioning + interference fit, the assembly process is shown in the appendix. Figure 4(a) to (d) First, place the electromagnetic lifting fixture inside the stator assembly to be assembled, with the locating key embedded in the keyway of the stator assembly. Place the housing in an oven for a certain period of time to maintain its temperature. After the temperature maintenance is complete, remove the housing and place the positioning guide fixture inside the housing onto the housing, ensuring that the keyway of the guide fixture is aligned with the keyway of the housing. Power on the electromagnetic lifting fixture; the solenoid generates a magnetic field, causing the electromagnetic chuck to adhere to and attract the stator assembly inside the housing. Use a sling to lower the stator assembly into the inner cavity of the positioning guide fixture inside the housing, ensuring that the locating key on the stator assembly falls precisely into the keyway of the positioning guide fixture. Slowly guide the motor stator assembly to be assembled into the inner cavity of the housing. Once the stator assembly is fully installed and in place, remove the positioning guide fixture from the housing, disconnect the power to the electromagnetic lifting fixture, and the solenoid will no longer generate a magnetic field. Remove the electromagnetic lifting fixture; the assembly is now complete.

[0057] The stator assembly process with full key positioning and interference fit is as follows: First, place the electromagnetic lifting fixture inside the stator assembly to be assembled. Place the housing in an oven for a certain period of time to maintain its temperature. After the temperature maintenance is complete, remove the housing and place the positioning guide fixture inside the housing onto the housing. Note that the process positioning key of the guide fixture should fall into the keyway of the housing. Power on the electromagnetic lifting fixture. The solenoid generates a magnetic field, and the electromagnetic chuck adheres to the inner cavity of the stator assembly. Use a sling to place the stator assembly into the inner cavity of the positioning guide fixture inside the housing. Note that the process positioning key of the positioning guide fixture inside the housing should fall exactly into the keyway of the stator assembly. Slowly guide the motor stator assembly to be assembled into the inner cavity of the housing. After the stator assembly is completely installed in the housing, remove the positioning guide fixture inside the housing, disconnect the power supply to the electromagnetic lifting fixture, and the solenoid will no longer generate a magnetic field. Remove the electromagnetic lifting fixture, install the positioning key, and the assembly is complete.

[0058] After the stator assembly is installed in place, simply disconnect the power supply to the electromagnetic lifting fixture for the stator assembly. Once the electromagnetic force disappears, the electromagnetic lifting fixture can be removed from the inner cavity of the stator assembly. Place the lifting fixture into the inner cavity of the motor stator assembly to be installed, and energize the electromagnet to attract the stator assembly, allowing the next stator assembly to proceed.

[0059] In summary, this invention solves the problem of manually holding and operating the workpiece when assembling the stator of a motor weighing several hundred kilograms using a multi-positioning method. It avoids assembly difficulties caused by misalignment of the stator assembly and the housing axis or misalignment of the keys. Furthermore, it is convenient, quick, safe, reliable, time-saving, labor-saving, and improves work efficiency.

Claims

1. A multi-positioning permanent magnet motor stator thermal assembly device, characterized in that, Includes electromagnetic hoisting fixture (12) for stator assembly and positioning and guiding fixture (13) inside the housing; The stator assembly electromagnetic hoisting fixture (12) includes an electromagnetic hoisting base (1), an electromagnetic chuck (2), a lifting eye bolt (3), and a solenoid (4). The electromagnetic hoisting base (1) is made of magnetically conductive material, with an internal cavity and a solenoid (4) wrapped around the outside. The electromagnetic chuck (2) is made of magnetically conductive material, located inside the cavity of the electromagnetic hoisting base (1), and is clearance-fitted. The part of the electromagnetic chuck (2) extending out of the cavity is arc-shaped, which facilitates contact with the inner wall of the object being hoisted. The lifting eye bolt (3) is fixed to the outer wall of the electromagnetic hoisting base (1) for easy hoisting. The electromagnetic chuck (2) is an integrally formed part, which is square in shape. One end is an arc-shaped end, and the other end is positioned in conjunction with the keyway of the electromagnetic lifting base (1). The outer diameter of the arc-shaped end of the electromagnetic chuck (2) is consistent with the inner cavity size of the stator assembly, ensuring that it can fit tightly and adsorb firmly with the stator assembly. The positioning guide tool (13) inside the housing includes a positioning guide tool with half-key positioning and interference fit and a positioning guide tool with full-key positioning and interference fit. The positioning guide fixture for semi-key positioning and interference fit includes a motor positioning guide shaft (8) and a process positioning key (9). The inner diameter of the guide shaft (8) is the same as the outer diameter of the stator core as a guide positioning. The inner wall of the motor positioning guide shaft (8) is designed with a keyway. After the process positioning key (9) is fixed with the motor positioning guide shaft (8), it serves as a key positioning alignment reference. The positioning guide fixture for full key positioning and interference fit is to open a keyway on the inner wall of the guide shaft (8) without adding process keys, and use the keyway as the alignment reference for key positioning.

2. The multi-positioning permanent magnet motor stator thermal assembly device as described in claim 1, characterized in that, The guide shaft of the semi-key positioning and interference fit positioning guide tool is designed with a sloped guide section at the front end of the inner cavity to facilitate the centering and positioning of the stator assembly.

3. The multi-positioning permanent magnet motor stator thermal assembly device as described in claim 1, characterized in that, The inner cavity of the electromagnetic hoisting base (1) has a keyway.

4. The multi-positioning permanent magnet motor stator thermal assembly device as described in claim 1, characterized in that, There are two electromagnetic chucks (2) with the same structure; the square end is inserted into the inner cavity of the electromagnetic lifting base (1), and the square end faces of the two electromagnetic chucks (2) do not contact each other; the square part of the electromagnetic chuck (2) can slide axially inside the cavity of the electromagnetic lifting base (1).

5. The assembly method using the multi-positioning permanent magnet motor stator thermal assembly device as described in claim 1, characterized in that, When assembling a stator with a semi-key positioning and interference fit, the following steps are included: Step 1: The stator assembly electromagnetic lifting fixture (12) is lowered into the inner cavity of the stator assembly (7) to be assembled by means of lifting eye bolts (3), wherein the positioning key (6) is embedded in the keyway of the stator assembly (7); Step 2: Insulate the motor housing (5) with heat, and remove the housing (5) after heat preservation; place the positioning guide fixture (13) inside the housing on the motor housing (5), wherein the keyway of the positioning guide fixture (13) inside the housing should be aligned with the keyway of the motor housing (5); Step 3: Power on the stator assembly hoisting fixture (12). After powering on, the solenoid (4) generates a magnetic field. After the magnetic field is generated, the electromagnetic chuck (2) adheres to the inner cavity of the stator assembly (7) and is attracted. Step 4: Use slings to lift the stator assembly (7) and place it into the inner cavity of the positioning guide fixture (13) inside the housing. After placement, the positioning key (6) on the stator assembly (7) must be placed in the keyway of the positioning guide fixture (13) inside the housing. Step 5: Using sling hoisting, the motor stator assembly (7) to be assembled is introduced into the inner cavity of the motor housing (5). After the motor stator assembly (7) is completely installed in the motor housing (5), the positioning guide fixture (13) inside the housing is removed, the power supply of the stator assembly electromagnetic hoisting fixture (12) is disconnected, the solenoid (4) no longer generates a magnetic field, the stator assembly electromagnetic hoisting fixture (12) is removed, and the assembly is completed. When assembling a stator with full key positioning and interference fit, the following steps are included: Step 1: Lower the stator assembly electromagnetic lifting fixture (12) into the inner cavity of the stator assembly (7) to be assembled by using the lifting eye bolts (3); Step 2: Insulate the motor housing (5) with heat, and remove the housing (5) after heat preservation; fix the process positioning key (9) to the positioning guide fixture (13) inside the housing with screws (10), and then place the positioning guide fixture (13) inside the housing on the motor housing (5). The process positioning key (9) of the positioning guide fixture (13) inside the housing should be aligned with the keyway of the motor housing (5) and fall into the keyway of the motor housing (5). Step 3: Power on the stator assembly hoisting fixture (12). After powering on, the solenoid (4) generates a magnetic field. After the magnetic field is generated, the electromagnetic chuck (2) adheres to the inner cavity of the stator assembly (7) and is attracted. Step 4: Use slings to lift the stator assembly (7) and place it into the inner cavity of the positioning guide fixture (13) inside the housing. After placement, the process positioning key (9) of the positioning guide fixture (13) inside the housing must be placed in the keyway on the stator assembly (7). Step 5: Using sling hoisting, the motor stator assembly (7) to be assembled is introduced into the inner cavity of the motor housing (5). After the motor stator assembly (7) is completely installed in the motor housing (5), the positioning guide fixture (13) inside the housing is removed, the power supply of the stator assembly electromagnetic hoisting fixture (12) is disconnected, the solenoid (4) no longer generates a magnetic field, and the stator assembly electromagnetic hoisting fixture (12) is removed. Step 6: Press the positioning key (6) into the keyway of the stator assembly (7) and the motor housing (5) according to the requirements of the motor design drawings. After the assembly is in place, the assembly is completed.

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