Motor magnetic steel fixing structure, motor and motor assembling method thereof

Abstract

The application discloses a motor magnetic steel fixing structure, a motor and a motor assembling method thereof, and comprises a first magnetic steel base and a second magnetic steel base. The first magnetic steel base comprises a first supporting ring in a circular ring structure, and at least two first partition columns are arranged on the side wall of the first supporting ring and are arranged at intervals in the circumferential direction. The second magnetic steel base comprises a second supporting ring in a circular ring structure, and at least two second partition columns are arranged on the side wall of the second supporting ring. The application adopts a plug-in assembling structure, realizes flexible plug-in of the magnetic steel through a slot structure, releases accumulated tolerances through extrusion of the slot during assembly, reduces the accumulated tolerances, realizes bearing support of the magnetic steel through the first supporting strip and the second supporting strip which extend inward on both sides of the magnetic steel groove, forms a convex top in the magnetic steel groove, releases axial tolerances during assembly, reduces the tolerances, simplifies the assembly process, and effectively improves the assembly precision and efficiency.

Description

Technical Field

[0001] This invention relates to the field of electric motors and power transmission, and in particular to a motor magnet fixing structure, the motor thereon, and a method for assembling the motor. Background Technology

[0002] An electric motor, also known as a motor, is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Electric motors can be classified into DC motors and AC motors according to the type of power supply they use; and into brushless motors and brushed motors according to their structure and working principle. Brushless motors consist of a motor body and a driver, and are mechatronic products. Due to their advantages such as high efficiency, low noise, and long lifespan, brushless motors are widely used in many fields, such as cooling fans, blenders, industrial robot joint drives, robotic arm drives, medical equipment, humanoid robot joint actuators, and miniature model airplane toys.

[0003] In motor assembly, the methods for fixing permanent magnets in motors include: 1. magnet + glue; 2. magnet fixing frame + glue; 3. magnet + fixing spring + glue; 4. magnet fixing frame + magnet; 5. magnet encapsulation (requires mold assistance to fix the magnet in the housing with plastic, the mold structure has limitations). The biggest problem with the existing fixture + magnet structure is that when there are many pole pairs, the cumulative tolerance becomes large as the number of magnet pieces increases. For example, in the case of 15 pole pairs and 30 magnet pieces, a tolerance of 1 mil per piece results in a cumulative tolerance of 30 mils. Moreover, the tolerance for the width of the magnet is often not 1 mil; the minimum tolerance for the width of the magnet in the existing technology is 5 mils, and it is usually 10 mils. As the number of magnets increases, the cumulative tolerance also increases. The cumulative tolerance affects the magnet assembly and the quality of the motor. In view of this, a magnet fixing structure needs to be designed for the fixture + magnet structure to reduce the cumulative tolerance and weaken its impact on assembly. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a motor magnet fixing structure, which adopts an interlocking assembly structure. Multiple magnetic steel slots are formed by multiple first and second spacers spaced apart along the circumferential direction for embedding and fixing magnets. A first slot and a second slot are radially opened in the middle of the magnetic steel slots. The slot structure enables flexible insertion of the magnets. Accumulated tolerances are released by squeezing the slots during assembly, thus reducing accumulated tolerances. First and second support bars extending inward from both sides of the magnetic steel slots provide load-bearing support for the magnets while forming a convex top within the magnetic steel slots, releasing axial tolerances during assembly. This reduces tolerances, simplifies the assembly process, and effectively improves assembly accuracy and efficiency. This invention also provides a motor and its assembly method for a motor magnet fixing structure.

[0005] The technical solution adopted in this invention is as follows: A motor magnet fixing structure for fixing motor magnets includes a first magnet base and a second magnet base. The first magnet base includes a first branch ring with a circular structure. At least two first spacers are provided on one side wall of the first branch ring. The at least two first spacers are spaced apart along the circumferential direction, and a magnet groove is formed between two adjacent first spacers. The second magnet base includes a second branch ring with a circular structure. At least two second spacers are provided on one side wall of the second branch ring. The at least two second spacers are spaced apart along the circumferential direction, and a magnet groove is formed between two adjacent second spacers. The magnet groove is a semi-rectangular frame. The first magnet base and the second magnet base are joined together along the axial direction, and the magnet grooves of the two form a rectangular groove for embedding magnets.

[0006] Preferably, the first partition and the second partition are respectively provided with an inwardly recessed first groove and a second groove.

[0007] Preferably, the first slot and the second slot are strip-shaped grooves, which are respectively located in the middle of the first partition and the second partition and extend in the radial direction.

[0008] Preferably, the first partition and the second partition are respectively provided with a first support strip and a second support strip along the inner ring sidewall of the first support ring and the second support ring. The first support strip and the second support strip extend into the magnet groove to form a support plane for axially supporting the magnet inserted into the magnet groove.

[0009] Preferably, the first support bar extends radially into the first support ring, and an axial groove is formed at the connection between the first support ring and the first support bar. A first convex top is formed between the axial grooves on both sides of the magnet groove for axially pressing the magnet in the magnet groove.

[0010] Preferably, the second support bar extends radially into the second support ring, and an axial groove is formed at the connection between the second support ring and the second support bar. A second convex top is formed between the axial grooves on both sides of the magnet groove for axially pressing the magnet in the magnet groove.

[0011] Preferably, at least two locking blocks are provided on the other side wall of the first support ring. The at least two locking blocks are spaced apart along the circumferential direction and protrude outward axially for locking and limiting.

[0012] Preferably, the other side of the second support ring is provided with a retaining ring extending inward, and the retaining ring has at least two axial mounting holes for mounting and fixing the second magnet seat.

[0013] A motor with a fixed magnet structure further includes a shaft, a stator, a first end cover, and a second end cover, wherein the shaft is arranged along the axial direction; the stator is sleeved on the shaft; the first end cover and the second end cover are arranged on both sides of the stator along the axial direction; the second magnet seat is embedded in the second end cover; and the first magnet seat is embedded in the second end cover.

[0014] Preferably, one side of the second end cap is provided with at least two axial slots, which are spaced apart along the circumferential direction for embedding the locking block of the first magnet seat.

[0015] A method for assembling a motor with a fixed magnet structure includes the following process steps: S1. Magnet assembly: At least two magnets are respectively embedded in the magnet slots of the second magnet seat; S2. Assembly of the second magnet base: After the magnet is assembled in step S1, the second magnet base is inserted into the second end cover, and the second magnet base and the second end cover are locked together through the axial mounting hole of the second magnet base. S3. Assembly of the first magnet base: After the second magnet base in step S2 is assembled on the second end cover, the first magnet base is inserted into the second magnet base in the axial direction to form the motor rotor. S4. Rotor assembly: After the motor rotor assembly in step S3 is completed, the whole unit is fitted onto the shaft from one side of the motor stator along the axial direction. S5. First end cover assembly: After the motor rotor is assembled in step S4, the first end cover is put onto the shaft from the other side and locked and fixed.

[0016] The beneficial effects of this invention are as follows: This invention addresses the shortcomings and deficiencies of existing technologies by independently developing and designing a plug-in assembly structure. Multiple magnetic steel slots are formed by multiple first and second spacers spaced along the circumferential direction for embedding and fixing magnets. A first and second slot are radially formed in the center of each magnetic steel slot, enabling flexible insertion of the magnets. Accumulated tolerances are released and reduced by squeezing the slots during assembly. First and second support bars extending inward from both sides of the magnetic steel slots provide load-bearing support for the magnets while simultaneously forming a convex top within the slots, releasing axial tolerances during assembly. This invention simplifies the assembly process while reducing tolerances, effectively improving assembly accuracy and efficiency. This invention relates to a motor magnet fixing structure, its motor, and its assembly method.

[0017] This invention belongs to the field of motors and their transmissions, and aims to design a device for use in motor assembly. Its function is to form multiple magnetic slots along the circumferential direction through an interlocking assembly structure of a first magnetic base and a second magnetic base for installing and fixing magnetic steel. At the same time, by opening slot structures on the partition columns on both sides of the magnetic steel slots, the cumulative tolerance effect is weakened by the squeezing of the slots during assembly, and the radial tolerance is released while realizing the bearing and support of the magnetic steel. Specifically, the present invention comprises a first magnet base and a second magnet base. The second magnet base has a cylindrical structure, and a second ring with a circular structure is formed on one end wall of the second magnet base. Multiple second spacers are spaced circumferentially on the outer side wall of the second ring, forming a magnet groove between adjacent second spacers. Second support bars extending inward are provided on both sides of the magnet groove, supporting and lifting the magnet inserted into the magnet groove. A key feature is that the second support bars extend inward toward the second ring to form recessed grooves, and the recessed grooves on both sides of the magnet groove create a second convex top on the outer side of the magnet groove. Similarly, the first spacer of the first magnet base also has a second... The system comprises a support bar and recessed grooves. The magnet is first inserted into the magnet groove embedded in the second magnet seat, supported by the second support bar. Then, the first spacer of the first magnet seat, corresponding to the second spacer, is inserted and assembled from the outside of the magnet into the second magnet seat, forming an integral magnet and magnet frame structure. The support bar and recessed groove structure support and lift the magnet while the recessed groove provides a compression space. When the assembled magnet pushes against the first or second convex top, the first and second convex tops axially clamp the magnet from both sides. Simultaneously, when the first and second convex tops are compressed by the magnet, the axial tolerance can be released through the recessed grooves on both sides. Furthermore, the first and second spacers have a through-hole and a second slot in their middle sections. During the assembly of the magnet seat, the magnet compresses the first and second spacers on both sides, eliminating the accumulated tolerance on both sides of the magnet groove through the first and second slots. This invention utilizes the principle of an arch bridge. Under the effect of cumulative tolerance, all the magnets are squeezed towards the inner wall of the end cap. Through the first and second slots, they are appropriately squeezed, releasing the cumulative tolerance of the magnet width during the assembly process. This allows the magnets to be assembled in place without the need for glue, and the magnets are firmly clamped. This not only eliminates the cumbersome glue application and baking processes, but also removes the limitations and risks of magnet demagnetization during baking. It enables automation and semi-automation of production line assembly, reducing costs and increasing efficiency. Attached Figure Description

[0018] Figure 1 This is one of the three-dimensional structural schematic diagrams of the present invention.

[0019] Figure 2 This is the second three-dimensional structural schematic diagram of the present invention.

[0020] Figure 3 This is a schematic diagram of the component breakdown structure of the present invention.

[0021] Figure 4 This is one of the three-dimensional structural schematic diagrams of the first magnet base of the present invention.

[0022] Figure 5 This is the second three-dimensional structural schematic diagram of the first magnet base of the present invention.

[0023] Figure 6 This is one of the three-dimensional structural schematic diagrams of the second magnet base of the present invention.

[0024] Figure 7 This is the second three-dimensional structural schematic diagram of the second magnet base of the present invention.

[0025] Figure 8 for Figure 5 Enlarged structural diagram at point I.

[0026] Figure 9 for Figure 6 Enlarged structural diagram at point II.

[0027] Figure 10 This is one of the component disassembly diagrams of the motor of the present invention.

[0028] Figure 11 This is the second schematic diagram showing the disassembled structure of the motor components of the present invention.

[0029] Figure 12 This is one of the three-dimensional structural schematic diagrams of the motor of the present invention.

[0030] Figure 13 This is the second three-dimensional structural schematic diagram of the motor of the present invention.

[0031] Figure 14 This is one of the schematic diagrams showing the disassembled structure of the present invention and the stator.

[0032] Figure 15 This is the second schematic diagram of the disassembled structure of the present invention and the stator.

[0033] Figure 16 This is a schematic diagram of the assembly process of the present invention.

[0034] In the diagram: 3, first magnet base; 4, second magnet base; 0, magnet; 31. First support ring; 32. First partition post; 33. Locking block; 34. First support bar; 35. First inclined guide surface; 36. First convex top; A. First slot; D. Magnet slot; E. Recessed groove 41. Second support ring; 42. Second partition post; 43. Second support bar; 44. Second inclined guide surface; 45. Second convex top; B. Second groove; C. Axial mounting hole; 1. Shaft; 2. Stator; 5. Bearing; 6. First end cover; 7. Second end cover; 8. Axial groove; 9. Locking screw. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] Example 1: As Figures 1 to 9 As shown, this invention proposes a motor magnet fixing structure for fixing motor magnets, including a first magnet seat 3 and a second magnet seat 4. The first magnet seat 3 includes a first ring 31 with a circular structure. At least two first spacers 32 are provided on one side wall of the first ring 31. The at least two first spacers 32 are spaced apart along the circumferential direction, and a magnet groove D is formed between two adjacent first spacers 32. The second magnet seat 4 includes a second ring 41 with a circular structure. At least two second spacers 42 are provided on one side wall of the second ring 41. The at least two second spacers 42 are spaced apart along the circumferential direction, and a magnet groove D is formed between two adjacent second spacers 42. The magnet groove D is a semi-rectangular frame. The first magnet seat 3 and the second magnet seat 4 are joined together along the axial direction, and their magnet grooves D form a rectangular groove for embedding magnets.

[0039] The first partition 32 and the second partition 42 are respectively provided with an inwardly recessed first groove A and a second groove B.

[0040] The first slot A and the second slot B are strip-shaped slots, respectively located in the middle of the first partition 32 and the second partition 42, and extending radially.

[0041] The first partition column 32 and the second partition column 42 are respectively provided with a first support bar 34 and a second support bar 43 along the inner ring sidewall of the first support ring 31 and the second support ring 41. The first support bar 34 and the second support bar 43 extend into the magnet groove D to form a support plane for axially supporting the magnet 0 inserted into the magnet groove D.

[0042] The first support bar 34 extends radially into the first support ring 31. An indented groove E is provided at the connection between the first support ring 31 and the first support bar 34 in the axial direction. A first convex top 36 is formed between the indented grooves E on both sides of the magnet groove D, which is used to axially press the magnet in the magnet groove D.

[0043] The second support bar 43 extends radially into the second support ring 41. An indented groove E is provided at the connection between the second support ring 41 and the second support bar 43 in the axial direction. A second convex top 45 is formed between the indented grooves E on both sides of the magnet groove D, which is used to axially press the magnet in the magnet groove D.

[0044] At least two locking blocks 33 are provided on the other side wall of the first support ring 31. The at least two locking blocks 33 are spaced apart along the circumferential direction and protrude outward axially for locking and limiting.

[0045] On the other side of the second support ring 41, there is a retaining ring extending inward. The retaining ring has at least two axial mounting holes C for mounting and fixing the second magnet seat 4.

[0046] Example 2: As Figures 9 to 15 As shown in the figure, as an embodiment of the present invention, this embodiment discloses a motor with a motor magnet fixing structure, which further includes a shaft 1, a stator 2, a first end cover 6 and a second end cover 7, wherein the shaft 1 is arranged in the axial direction; the stator 2 is sleeved on the shaft 1; the first end cover 6 and the second end cover 7 are arranged on both sides of the stator 2 in the axial direction; the second magnet seat 4 is embedded in the second end cover 7; and the first magnet seat 3 is embedded in the second end cover 7.

[0047] The second end cap 7 has at least two axial slots 8 on one side, which are spaced apart along the circumferential direction and are used to embed the locking block 33 of the first magnet seat 3.

[0048] Furthermore, after the second magnet seat 4 of the present invention is assembled into the second end cover 7, the second magnet seat 4 and the second end cover 7 are locked and fixed by inserting connecting screws into the axial mounting hole C of the second magnet seat 4.

[0049] Furthermore, after the first end cap 6 and the second end cap 7 of the present invention are assembled, they are locked and fixed by a plurality of locking screws 9.

[0050] Example 3: As Figure 16As shown, as an embodiment of the present invention, this embodiment discloses a method for assembling a motor with a motor magnet fixing structure, including the following process steps: S1. Magnet assembly: At least two magnets are respectively embedded in the magnet slots of the second magnet seat; S2. Assembly of the second magnet base: After the magnet is assembled in step S1, the second magnet base is inserted into the second end cover, and the second magnet base and the second end cover are locked together through the axial mounting hole of the second magnet base. S3. Assembly of the first magnet base: After the second magnet base in step S2 is assembled on the second end cover, the first magnet base is inserted into the second magnet base in the axial direction to form the motor rotor. S4. Rotor assembly: After the motor rotor assembly in step S3 is completed, the whole unit is fitted onto the shaft from one side of the motor stator along the axial direction. S5. First end cover assembly: After the motor rotor is assembled in step S4, the first end cover is put onto the shaft from the other side and locked and fixed.

[0051] Furthermore, this invention designs a motor magnet fixing structure using an interlocking assembly structure. Multiple first and second spacers spaced at intervals along the circumference form multiple magnet slots for embedding and fixing magnets. A first and second slot are radially opened in the center of each magnet slot. The slot structure enables flexible insertion of the magnets. Accumulated tolerances are released by squeezing the slots during assembly, reducing cumulative tolerances. First and second support bars extending inward from both sides of the magnet slot provide load-bearing support for the magnets while simultaneously forming a convex top within the magnet slot, releasing axial tolerances during assembly. This reduces tolerances while simplifying the assembly process, effectively improving assembly accuracy and efficiency. This invention also relates to the motor and its assembly method. This invention belongs to the field of motors and their transmissions, and aims to design a device for use in motor assembly. Its function is to form multiple magnetic slots along the circumferential direction through an interlocking assembly structure of a first magnetic base and a second magnetic base for installing and fixing magnetic steel. At the same time, by opening slot structures on the partition columns on both sides of the magnetic steel slots, the cumulative tolerance effect is weakened by the squeezing of the slots during assembly, and the radial tolerance is released while realizing the bearing and support of the magnetic steel. Specifically, the present invention comprises a first magnet base and a second magnet base. The second magnet base has a cylindrical structure, and a second ring with a circular structure is formed on one end wall of the second magnet base. Multiple second spacers are spaced circumferentially on the outer side wall of the second ring, forming a magnet groove between adjacent second spacers. Second support bars extending inward are provided on both sides of the magnet groove, supporting and lifting the magnet inserted into the magnet groove. A key feature is that the second support bars extend inward toward the second ring to form recessed grooves, and the recessed grooves on both sides of the magnet groove create a second convex top on the outer side of the magnet groove. Similarly, the first spacer of the first magnet base also has a second... The system comprises a support bar and recessed grooves. The magnet is first inserted into the magnet groove embedded in the second magnet seat, supported by the second support bar. Then, the first spacer of the first magnet seat, corresponding to the second spacer, is inserted and assembled from the outside of the magnet into the second magnet seat, forming an integral magnet and magnet frame structure. The support bar and recessed groove structure support and lift the magnet while the recessed groove provides a compression space. When the assembled magnet pushes against the first or second convex top, the first and second convex tops axially clamp the magnet from both sides. Simultaneously, when the first and second convex tops are compressed by the magnet, the axial tolerance can be released through the recessed grooves on both sides. Furthermore, the first and second spacers have a through-hole and a second slot in their middle sections. During the assembly of the magnet seat, the magnet compresses the first and second spacers on both sides, eliminating the accumulated tolerance on both sides of the magnet groove through the first and second slots.This invention utilizes the principle of an arch bridge. Under the effect of cumulative tolerance, all the magnets are squeezed towards the inner wall of the end cap. Through the first and second slots, they are appropriately squeezed, releasing the cumulative tolerance of the magnet width during the assembly process. This allows the magnets to be assembled in place without the need for glue, and the magnets are firmly clamped. This not only eliminates the cumbersome glue application and baking processes, but also removes the limitations and risks of magnet demagnetization during baking. It enables automation and semi-automation of production line assembly, reducing costs and increasing efficiency.

[0052] The embodiments of this invention are merely illustrative of specific implementation methods and are not intended to limit the scope of protection. Those skilled in the art can make modifications based on these embodiments; therefore, all equivalent changes or modifications made in accordance with the scope of this invention's patent claims fall within the scope of this invention's patent claims.

Claims

1. A motor magnet fixing structure for fixing motor magnets, characterized in that: Including a first magnet base (3) and a second magnet base (4), wherein, The first magnet base (3) includes a first ring (31) with a circular structure. At least two first partitions (32) are provided on one side wall of the first ring (31). The at least two first partitions (32) are spaced apart along the circumferential direction, and a magnet groove (D) is formed between two adjacent first partitions (32). The second magnet base (4) includes a second ring (41) with a circular structure. At least two second partitions (42) are provided on one side wall of the second ring (41). The at least two second partitions (42) are spaced apart along the circumferential direction, and a magnet groove (D) is formed between two adjacent second partitions (42). The magnet groove (D) is a semi-rectangular frame. The first magnet seat (3) and the second magnet seat (4) are joined together in the axial direction, and the magnet grooves (D) of the two form a rectangular groove for embedding magnets (0). The first partition (32) and the second partition (42) are respectively provided with an inwardly recessed first groove (A) and a second groove (B); The first slot (A) and the second slot (B) are strip-shaped slots. The first slot (A) and the second slot (B) are respectively located in the middle of the first partition (32) and the second partition (42) and extend in the radial direction respectively.

2. The motor magnet fixing structure according to claim 1, characterized in that: The first partition (32) and the second partition (42) are respectively provided with a first support strip (34) and a second support strip (43) along the inner ring sidewall of the first support ring (31) and the second support ring (41). The first support strip (34) and the second support strip (43) extend into the magnet groove (D) to form a support plane for axially supporting the magnet (0) inserted into the magnet groove (D).

3. The motor magnet fixing structure according to claim 2, characterized in that: The first support bar (34) extends radially into the first support ring (31). The first support ring (31) and the first support bar (34) are connected in the axial direction with an indented groove (E). A first convex top (36) is formed between the indented grooves (E) on both sides of the magnet groove (D) for axially pressing the magnet in the magnet groove (D).

4. The motor magnet fixing structure according to claim 2, characterized in that: The second support bar (43) extends radially into the second support ring (41). The connection between the second support ring (41) and the second support bar (43) is provided with an axial groove (E). A second convex top (45) is formed between the two convex grooves (E) on both sides of the magnet groove (D) for axially pressing the magnet in the magnet groove (D).

5. The motor magnet fixing structure according to claim 1, characterized in that: At least two locking blocks (33) are provided on the other side wall of the first support ring (31). The at least two locking blocks (33) are spaced apart along the circumferential direction and protrude outward in the axial direction for locking and limiting.

6. The motor magnet fixing structure according to claim 1, characterized in that: The other side of the second support ring (41) is provided with a retaining ring extending into the inner ring, and the retaining ring is provided with at least two axial mounting holes (C) for mounting and fixing the second magnet seat (4).

7. A motor comprising the motor magnet fixing structure according to any one of claims 1 to 6, characterized in that: It also includes a shaft (1), a stator (2), a first end cover (6) and a second end cover (7), wherein the shaft (1) is arranged in the axial direction; the stator (2) is sleeved on the shaft (1); the first end cover (6) and the second end cover (7) are arranged on both sides of the stator (2) in the axial direction; the second magnet seat (4) is embedded in the second end cover (7); and the first magnet seat (3) is embedded in the second end cover (7).

8. The motor with a magnet fixing structure according to claim 7, characterized in that: The second end cap (7) has at least two axial slots (8) on one side, and the at least two axial slots (8) are spaced apart along the circumferential direction for embedding the locking block (33) of the first magnet seat (3).

9. The assembly method of a motor with a motor magnet fixing structure according to claim 7, characterized in that, The process includes the following steps: S1. Magnet assembly: At least two magnets are respectively embedded in the magnet slots of the second magnet seat; S2. Assembly of the second magnet base: After the magnet is assembled in step S1, the second magnet base is inserted into the second end cover, and the second magnet base and the second end cover are locked together through the axial mounting hole of the second magnet base. S3. Assembly of the first magnet base: After the second magnet base in step S2 is assembled on the second end cover, the first magnet base is inserted into the second magnet base in the axial direction to form the motor rotor. S4. Rotor assembly: After the motor rotor assembly in step S3 is completed, the whole unit is fitted onto the shaft from one side of the motor stator along the axial direction. S5. First end cover assembly: After the motor rotor is assembled in step S4, the first end cover is put onto the shaft from the other side and locked and fixed.

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