Auxiliary assembly tool for permanent magnet rotor surface-mounted magnetic steel

Abstract

The invention relates to a special tool for assembling surface-mounted magnetic steel of a permanent magnet rotor of a motor, which is characterized in that a strip-shaped hole penetrating through a pipe wall is formed in the pipe wall of an outer sleeve, and a magnetic steel embedding groove in a rotor iron core is exposed through the arrangement of the strip-shaped hole, so that the convenience of gluing and an operation space for placing the magnetic steel are provided, and when the magnetic steel embedding groove in the iron core is filled with the magnetic steel, the magnetic steel can be placed in the magnetic steel embedding groove. The rotating iron core rotates by one slot position of the magnetic steel embedding slot, the magnetic steel embedded in the slot is transferred to the locking screw setting position arranged on one side of the strip-shaped hole, the position of the magnetic steel in the colloid curing process is determined, and the labeling efficiency and the surface mounting precision are both guaranteed.

Description

Technical Field

[0001] This invention relates to motor rotor assembly fixtures, specifically to auxiliary assembly fixtures for surface-mounted magnets on permanent magnet rotors. Background Technology

[0002] Permanent magnet motors are widely used in new energy vehicles, industrial drives, and other fields due to their advantages such as high efficiency and high power density. In the manufacturing of its core component, the permanent magnet rotor, the assembly of surface-mount magnets is a key process. Technicians have made great efforts to achieve the precision and reliability of magnet assembly.

[0003] The invention is entitled "A Permanent Magnet Motor Permanent Magnet Rotor Magnet Assembly Fixture" (Document Publication No. CN 205681264U, hereinafter referred to as Document 1). The circular pressing fixture 1 is fitted into the rotating shaft 2 of the permanent magnet motor and is located on the rotor core 3. The pressing fixture 1 is provided with magnet holes 5 corresponding to the rotor core 3. The magnet 4 is pressed into the magnet holes 5 by axial displacement.

[0004] The invention is titled "A Rapid Assembly Process for Surface-Mounted Magnets in a Permanent Magnet Motor" (document publication CN 113612359 A, hereinafter referred to as Document 2). The assembly process uses a hydraulic press and auxiliary tooling to press the stacked rotor laminations onto a heated rotor support 1. The rotor laminations 4 are provided with dovetail grooves 5, and structural adhesives A and B are applied to the inner side of the dovetail grooves 5. When the magnets 3 to be surface-mounted are placed inside the dovetail grooves 5, they can be quickly attached.

[0005] In references 1 and 2, the former has a magnet hole 5 set in the middle of the disk surface of the rotor core 3, and the periphery of the magnet 4 is completely surrounded by the hole wall of the magnet hole 5; the latter has a dovetail groove 5 set on the rotor lamination 4, and the magnet 3 is surrounded by the dovetail groove 5 on three sides, with only the outer wall surface exposed, i.e., surface-mounted magnet.

[0006] Both of the above-mentioned documents 1 and 2 adopt the scheme of inserting magnets by axial displacement. When magnets in the same slot or hole are installed, the displacement path of the first magnet is the longest, that is, the entire length of the slot or hole. The displacement of subsequent magnets is reduced one by one. The average displacement stroke of all magnets is half the length of the slot or hole, resulting in low installation efficiency. Furthermore, after the magnet 3 in document 2 is installed, friction marks between the rotor support 1 will inevitably appear on its outer surface. Summary of the Invention

[0007] The purpose of this invention is to provide an auxiliary assembly fixture for surface-mount magnets of permanent magnet rotors, which improves assembly efficiency while ensuring that the outer circumferential surface of the permanent magnet is a common cylindrical surface.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: an auxiliary assembly fixture for surface-mount magnets of a permanent magnet rotor, wherein the outer sleeve has end caps at both ends, and at least one end is a detachable end cap, the end cap has a shaft hole in the middle for the rotor shaft to pass through, the outer sleeve has a strip hole penetrating the sleeve wall, the long axis of the strip hole is consistent with the length of the sleeve, a locking screw is provided on one side of the strip hole, and the locking screws are evenly arranged in a line along the long axis of the strip hole.

[0009] In the above scheme, a strip-shaped hole is made through the wall of the outer tube. The strip-shaped hole exposes the magnet embedding slots on the rotor core, which provides convenience for applying adhesive and provides operating space for inserting magnets. When the magnet embedding slots on the core are full of magnets, rotating the core rotates one slot. The magnets embedded in the slots are moved to the locking screw position set on one side of the strip-shaped hole. The locking screws are tightened appropriately so that the inner end of the locking screw abuts against the outer surface of the magnet. During the adhesive curing process, the position of the magnets is determined, that is, the outer circumference of the magnets is in the design value position within the error range. The process of waiting for the adhesive to cure is exactly the same as the labeling operation of the magnets in the embedding slots. The labeling efficiency and surface labeling accuracy are both guaranteed. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0011] Figure 2 This is a three-dimensional structural diagram of the surface-mount magnet process.

[0012] Figure 3 This is a structural diagram of the surface-mount magnet process.

[0013] Figure 4 yes Figure 3 AA section view in the image. Detailed Implementation

[0014] Combination Figures 1-4 First, it should be noted that when surface-mounting magnets, the rotor core 1 is placed in the tooling provided in this application and arranged vertically on the worktable.

[0015] The auxiliary assembly fixture for the surface-mount magnets of the permanent magnet rotor has end caps at both ends of the outer tube 10, and at least one end is a detachable end cap 20. The end cap 20 has a shaft hole 21 in the middle for the rotor shaft to pass through. The tube wall of the outer tube 10 has a strip hole 11 that penetrates the tube wall. The long axis of the strip hole 11 is consistent with the tube length direction. A locking screw 30 is provided on one side of the strip hole 11. The locking screws 30 are evenly arranged in a line along the long axis of the strip hole 11.

[0016] The outer sleeve 10 has detachable end caps 20 at both ends to facilitate the installation of the rotor core 1 inside the cavity of the outer sleeve 10. The end caps 20 are then connected to both ends of the outer sleeve 10, and the rotor shaft 2 is axially and radially positioned and fixed by the end caps 20. The width of the strip hole 11 on the outer sleeve 10 is slightly larger than the circumferential width and axial length of the magnet slot on the rotor core 1 to ensure smooth insertion of the magnet 3. After the magnets 3 in the same magnet slot are applied with adhesive from bottom to top and inserted into place, the rotor shaft 2 is rotated to rotate the rotor core 1 to the position where the magnet 3 that has just been surface-mounted is directly opposite the position of the locking screw 30. Then, the locking screw 30 is tightened to keep the magnet 3 in the designed position and wait for the adhesive to cure. While waiting for the adhesive to cure, the surface-mounting operation of the magnet 3 in the magnet slot directly opposite the strip hole 11 is performed. This cycle is repeated until all magnets 3 are surface-mounted. After the adhesive at the last row of magnets 3 has cured, the rotor can be separated from the tooling.

[0017] To ensure that the outer circumference of the magnet 3 on the rotor is within the design value of the same cylindrical circumference, the gap between the inner wall of the outer sleeve 10 and the theoretical outer diameter of the magnet 3 is 0.1-0.3mm. After the magnet 3 is glued to the magnet slot on the rotor core 1 and cured, the error between the outer circumferential surface of the magnet 3 and the theoretical outer diameter of the magnet 3 is within the design error range. The reserved gap of 0.1-0.3mm also ensures that there will be no friction or scratching between the outer circumferential surface of the magnet 3 and the outer sleeve 10 when the rotor core 1 is rotated, thus ensuring the overall integrity of the appearance of the magnet 3.

[0018] To prevent friction and scratching between the outer circumference of the magnet 3 and the outer sleeve 10 during rotation, an elastic inner liner 40 is attached to the inner wall of the outer sleeve 10. The inner end of the locking screw 30 is exposed inside the elastic inner liner 40. During the tightening process of the locking screw 30, at a certain time when the surface bonding of the magnet 3 at the magnet groove where the strip hole 11 is aligned is finished, the degree of curing of the adhesive of each magnet 3 at the location of the locking screw 30 is different. The radial surface difference between the outer circumference of the magnet 3 is unavoidable, and the slight displacement of the adhesive that has not been fully cured when the locking screw 30 is released causes radial displacement of the outer circumference of the magnet 3. The radial displacement of the outer circumference of the magnet 3 can be reduced or even eliminated by the pressure constraint of the elastic inner liner 40 downstream of the locking screw 30.

[0019] There are two preferred options for the elastic liner 40:

[0020] Preferred option 1: The elastic liner 40 is a thin-walled elastic tubular shape with clearance holes 41 corresponding to the position and range of the strip hole 11 and through holes for the locking screw 30 to pass through. The clearance holes 41 are designed for the surface mounting operation of the embedded magnet 3.

[0021] Preferred Option 2: The elastic liner 40 is a thin-walled elastic tube with a C-shaped open cross-section. The position and range of the opening correspond to the strip hole 11. The elastic liner 40 has a through hole for the locking screw 30 to pass through.

[0022] The elastic liner 40 attached to the inner wall of the outer sleeve 10 is an elastic pad with a thickness of 0.5-1mm, made of silicone rubber or polyurethane. The gap between the elastic liner 40 and the theoretical outer diameter of the magnet 3 attached to the rotor surface is 0.1-0.2mm. The above-mentioned 0.1-0.2mm reserved gap not only ensures the normal rotation of the magnet 3, but also provides correction when surface differences occur in the magnet 3.

[0023] Preferably, the outer sleeve 10 and the end caps 20 at both ends are detachably connected. When the outer sleeve 10 is arranged vertically, the lower end cap 20 near the edge of the strip hole 11 has a through-hole 22 for discharging glue. The detachable connection between the outer sleeve 10 and the end caps 20 at both ends allows for quick assembly and disassembly of the tooling and rotor, significantly improving efficiency.

[0024] Preferably, the inner end face of the locking screw 30 is provided with an elastic pad 31. The elastic pad 31 at the inner end of the locking screw 30 can prevent the outer peripheral surface of the magnet 3 from being locally crushed or scratched by the locking screw 30. The uniform pressing surface is also conducive to the parallelism between the outer peripheral surface of the magnet 3 and its design surface, or in other words, it can reduce the angled oblique state between the outer peripheral surface of the magnet 3 and its design surface.

[0025] To further improve the assembly efficiency of the rotor and tooling, the outer sleeve 10 is composed of two, three, or four arc-shaped tube half-units 10a. A two-half split structure is conventional; for larger rotors, a three- or four-half arc-shaped tube half-unit 10a enclosure scheme can be considered. The split-type arc-shaped tube half-unit 10a scheme significantly improves the efficiency of disassembling the rotor and tooling after the magnets 3 are surface-mounted, and completely avoids scratches and friction between the outer sleeve 10 and the outer periphery of the magnets 3.

[0026] Preferably, the outer sleeve 10 is formed by a half-unit 10a of arc-shaped tube and the connection is a detachable connection.

[0027] There are three types of half-unit connection schemes for the arc-shaped tube half-unit 10a:

[0028] Firstly, a hinge 50 is provided at the adjacent edge of the arc-shaped tube half-unit 10a for connection. The two folding plates of the hinge 50 are respectively connected to the tube body on the adjacent side of the arc-shaped tube half-unit 10a, such as... Figure 3 , 4 As shown.

[0029] Secondly, at least one of the adjacent sides of the arc-shaped tube half-unit 10a is provided with an external flange, and the two flanges are constrained by a clamp when they come close together.

[0030] Thirdly, the arc-shaped tube half-unit 10a, after being connected by end plates 20 at both ends, can also achieve and maintain its stable circular tube shape, such as... Figure 1 , 2 As shown.

[0031] During the process of applying adhesive to the magnet slot and embedding the magnet 3, the adhesive, being in its pre-cured, fluid state, flows down to the lower end cap 20. To prevent adhesive from adhering to the lower end of the rotor core 1 and causing difficulties in cleaning, a raised ring 23 is provided along the edge of the central hole of the lower end cap 20. The raised ring 23 forms an abutment-type axial limiting fit with the stepped platform of the corresponding section of the rotor shaft 2, and a radial dynamic fit with the corresponding section of the rotor shaft 2. The raised ring 23 lifts the lower end face of the rotor core 1 to an appropriate height above the end cap 20, while also providing radial and axial positioning for the rotor shaft 2.

Claims

1. An auxiliary assembly fixture for surface-mounted magnets of a permanent magnet rotor, characterized in that: The outer tube (10) has end caps at both ends, and at least one end is a detachable end cap (20). The end cap (20) has a shaft hole (21) in the middle for the rotor shaft to pass through. The outer tube (10) has a strip hole (11) through the tube wall. The long axis of the strip hole (11) is consistent with the tube length direction. A locking screw (30) is provided on one side of the strip hole (11). The locking screws (30) are evenly arranged in a line along the long axis of the strip hole (11).

2. The auxiliary assembly fixture for the surface-mount magnets of the permanent magnet rotor according to claim 1, characterized in that: The gap between the inner wall of the outer tube (10) and the theoretical outer diameter of the magnet (3) is 0.1-0.3 mm.

3. The auxiliary assembly fixture for the surface-mount magnets of the permanent magnet rotor according to claim 1, characterized in that: An elastic liner (40) is attached to the inner wall of the outer tube (10), and the inner end of the locking screw (30) is exposed on the inside of the elastic liner (40).

4. The auxiliary assembly fixture for the surface-mount magnets of the permanent magnet rotor according to claim 3, characterized in that: The elastic liner (40) is a thin-walled elastic tubular tube with clearance holes (41) corresponding to the position and range of the strip hole (11) and through holes for the locking screw (30) to pass through.

5. The auxiliary assembly fixture for the surface-mount magnets of the permanent magnet rotor according to claim 3, characterized in that: The elastic liner (40) is a thin-walled elastic tube with a C-shaped opening in the tube body. The opening corresponds to the position and range of the strip hole (11). The elastic liner (40) has a through hole for the locking screw (30) to pass through.

6. The auxiliary assembly fixture for surface-mounted magnets of a permanent magnet rotor according to claim 1, 3, 4, or 5, characterized in that: The elastic liner (40) attached to the inner wall of the outer sleeve (10) is an elastic pad with a thickness of 0.5-1mm, made of silicone rubber or polyurethane. The gap between the elastic liner (40) and the theoretical outer diameter of the magnet (3) attached to the rotor surface is 0.1-0.2mm.

7. The auxiliary assembly fixture for the surface-mount magnets of the permanent magnet rotor according to claim 1, characterized in that: The outer tube (10) and the end caps (20) at both ends are detachably connected. When the outer tube (10) is arranged vertically, the end cap (20) at the lower end has a leakage hole (21) that penetrates the cover body near the edge of the strip hole (11).

8. The auxiliary assembly fixture for surface-mounted magnets of a permanent magnet rotor according to claim 1, 2, or 3, characterized in that: An elastic washer (31) is provided on the inner end face of the locking screw (30).

9. The auxiliary assembly fixture for surface-mounted magnets of a permanent magnet rotor according to claim 1, characterized in that: The outer tube (10) is formed by two, three or four arc-shaped tube half units (10a).

10. The auxiliary assembly fixture for surface-mounted magnets of a permanent magnet rotor according to claim 9, characterized in that: The outer tube (10) is formed by a half-unit (10a) of arc-shaped tube and the connection is a detachable connection.

11. The auxiliary assembly fixture for surface-mounted magnets of a permanent magnet rotor according to claim 9, characterized in that: The arc-shaped tube half-unit (10a) is connected by a hinge (50) at its adjacent edge.

12. The auxiliary assembly fixture for surface-mounted magnets of a permanent magnet rotor according to claim 11, characterized in that: At least one of the adjacent sides of the arc-shaped tube half-unit (10a) is provided with an external flange, and the two flanges are constrained by a clamp when they come close together.

13. The auxiliary assembly fixture for surface-mounted magnets of a permanent magnet rotor according to claim 1, characterized in that: The inner hole of the center hole of the end cover (20) forms an abutment-type axial limiting fit with the stepped platform of the stepped shaft of the corresponding section of the rotor shaft (1) and forms a radial dynamic fit with the corresponding section of the rotor shaft (1).

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