Assembling tool for multi-section type magnetic steel permanent magnet motor rotor

Abstract

The utility model provides an assembling tool for a multi-section magnetic steel permanent magnet motor rotor. The assembling tool comprises a base, the base comprises a bottom wall and a side wall, and the bottom wall and the side wall define a containing cavity used for containing a permanent magnet motor rotor to be assembled; the end cover is mounted at the top of the base and comprises a plurality of side holes and a plurality of top holes, and the positions of the side holes correspond to the positions of the top holes, so that a section of magnetic steel can be inserted from the side holes and pressed down through the corresponding top holes; the top pressing piece is configured to penetrate through the top hole to press down the magnetic steel; the plurality of locking pieces are arranged on the side wall of the base; and the plurality of locking pieces are configured to apply top pressure from the side surface of the magnetic steel so as to fix the position of the magnetic steel. According to the assembling tool for the multi-section type magnetic steel permanent magnet motor rotor, the assembling operation of the multi-section type magnetic steel permanent magnet motor rotor is simplified.

Description

Technical Field

[0001] This application relates to the field of electric motors, and more specifically, to an assembly tool for a multi-segment permanent magnet motor rotor. Background Technology

[0002] Currently, most permanent magnet synchronous motor rotors used in new energy vehicles are made of neodymium iron boron permanent magnets, which have extremely strong magnetic force. This is especially true for multi-segment permanent magnet motor rotors, where there is a strong repulsive force between the magnets. The current solutions to prevent axial movement of the magnets are basically to add end caps to both ends of the rotor. After the magnets are installed, the end caps are fixed to the rotor core with rivets to restrict the axial movement of the magnets.

[0003] More specifically, see reference Figure 1 and Figure 2 The permanent magnet motor rotor includes a rotor shaft 41 and an iron core 42. Multiple magnet slots 2 are distributed within the iron core 42, and each magnet slot 2 contains multiple magnet segments 31, 32, and 33. These magnet segments 31, 32, and 33 exhibit repulsive forces; if not secured, they will pop out. Currently, in the production of such multi-segment magnets, the insertion process mostly involves manual gluing to fix the magnet segments 31, 32, and 33, which is labor-intensive and tedious. After the magnet segments 31, 32, and 33 are installed into the magnet slots 2, end caps 5 are pressed onto the magnet slots 2 and secured with rivets 1. Utility Model Content

[0004] The purpose of this application is to solve or at least alleviate the problems existing in the prior art.

[0005] According to one aspect of this application, an assembly tool for a multi-segment permanent magnet motor rotor is provided, the assembly tool comprising:

[0006] A base, the base including a bottom wall and side walls, the bottom wall and side walls defining a cavity for receiving a permanent magnet motor rotor to be assembled;

[0007] An end cap is mounted on the top of the base and includes a plurality of side holes and a plurality of top holes, the plurality of side holes and the plurality of top holes being positioned correspondingly so that a section of magnet can be inserted from the side holes and pressed down through the corresponding top holes;

[0008] A pressing member, the pressing member being configured to press down a magnet through the top hole; and

[0009] Multiple locking elements are disposed on the side wall of the base, the multiple locking elements being configured to apply top pressure from the side of the magnet to fix the position of the magnet.

[0010] Optionally, in an embodiment of the assembly tool, the base is cylindrical and the end cap is disc-shaped, wherein the plurality of locking elements, the plurality of side holes and the plurality of top holes are evenly distributed along the circumference and are positioned correspondingly.

[0011] Optionally, in an embodiment of the assembly tool, the base has a rotor shaft hole on its bottom wall to accommodate a rotor shaft, and the base has bolt holes on its bottom wall for fixing to a bottom platform.

[0012] Optionally, in an embodiment of the assembly tool, the end cap includes an inner peripheral wall, an outer peripheral wall, and a top wall connecting the outer peripheral wall and the inner peripheral wall. The plurality of side holes are disposed on the outer peripheral wall, and the plurality of top holes are disposed on the top wall. When the end cap is assembled to the base, the outer peripheral wall of the end cap is supported by the side wall of the base, and the inner peripheral wall surrounds the rotor shaft of the permanent magnet motor rotor.

[0013] Optionally, in an embodiment of the assembly tool, a plurality of threaded holes are provided on the sidewall of the base, the plurality of threaded holes being located in the upper third portion of the sidewall in height, and the locking member being a bolt that matches the threaded holes.

[0014] Optionally, in an embodiment of the assembly tool, the assembly tool further includes a support ring disposed at the bottom of the base, the permanent magnet motor rotor being supported by the support ring when placed in the cavity.

[0015] Optionally, in an embodiment of the assembly tool, the support ring is made of a different material than the base and has a higher hardness than the base.

[0016] Optionally, in an embodiment of the assembly tool, the base, end cap, top pressure member, locking member, and support ring are all made of non-magnetic materials, wherein the base, end cap, top pressure member, and locking member are made of aluminum-based material or plastic, and the support ring is made of non-magnetic stainless steel.

[0017] Optionally, in an embodiment of the assembly tool, the end cap further includes a plurality of positioning holes disposed between the plurality of top holes, and the assembly tool further includes one or more positioning pins that pass through the positioning holes of the end cap and the positioning feature holes on the permanent magnet motor rotor to lock the angular position of the end cap relative to the permanent magnet motor rotor.

[0018] Optionally, in an embodiment of the assembly tool, both the plurality of side holes and the plurality of top holes are rectangular.

[0019] The assembly tool for multi-segment permanent magnet motor rotors according to the embodiment simplifies the assembly operation of multi-segment permanent magnet motor rotors. Attached Figure Description

[0020] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0021] Figure 1 and Figure 2 The diagrams show perspective views of the multi-segment permanent magnet motor rotor before and after end cover installation; and...

[0022] Figure 3 and Figure 4 A perspective view and a cross-sectional view of an assembly tool for a multi-segment permanent magnet motor rotor according to an embodiment are shown respectively. Detailed Implementation

[0023] refer to Figure 3 and Figure 4 This application describes an assembly tool for a multi-segment permanent magnet motor rotor. The assembly tool includes: a base 6, comprising a bottom wall 61 and side walls 62 defining a cavity for accommodating the permanent magnet motor rotor to be assembled; an end cap 7, mounted to the top of the base 6 and including a plurality of side holes 72 and a plurality of top holes 71, the side holes 72 and top holes 71 being correspondingly positioned to allow a segment of magnet to be inserted through the side holes 72 and pressed down through the corresponding top holes 71; a pressing member 74 configured to press down the magnet through the top holes 71; and a plurality of locking members 8 disposed on the side walls 62 of the base, the locking members 8 being configured to apply a pressing force from the side of the magnet to fix its position. In the actual installation process, the bottom of the permanent magnet motor rotor to be assembled can first be riveted or otherwise connected to the end plate 51, and then placed in the cavity. Three magnets 31, 32, and 33 are sequentially installed into the magnet slot through the side hole 72. After the uppermost magnet 33 is placed into the magnet slot through the side hole 72, the top pressing member 74 presses down to make the three magnets axially close together. Then, the locking member 8 applies top pressure from the side of the magnets to the uppermost magnet 33, thereby fixing the installed magnet in place and preventing it from popping out. Each set of magnets is installed according to the above steps. After all magnets are installed, the end cover 7 can be removed and the end plate 5 can be installed, thus completing the assembly of the permanent magnet motor rotor. With this assembly tool, no glue is needed during the assembly of the permanent magnet motor rotor, simplifying the assembly operation and making it suitable for automated mechanical production line assembly.

[0024] In some embodiments, the base 6 is generally cylindrical, and the end cap 7 is generally disc-shaped. A plurality of locking elements 8, a plurality of side holes 72, and a plurality of top holes 71 are evenly distributed circumferentially and are correspondingly positioned. The positions of the plurality of locking elements 8, the plurality of side holes 72, and the plurality of top holes 71 substantially correspond to the distribution of magnets in the permanent magnet motor rotor to be assembled. In the illustrated embodiment, the permanent magnet motor rotor includes 10 sets of magnets, therefore the number of locking elements 8, side holes 72, and top holes 71 is also 10.

[0025] In some embodiments, the pressing member 74 may be a pressing rod, which may be made of nylon to avoid damaging the magnets. The pressing operation may be performed by a machine or manually. In some embodiments, the bottom wall 61 of the base 6 has a rotor shaft hole 612 to receive the rotor shaft 41, i.e., the first end 412 of the rotor shaft 41. In some embodiments, the bottom wall 61 of the base 6 is provided with bolt holes 611 for fixing to the bottom platform 60, which may be a fixed platform or a rotatable platform. If it is desired to apply the assembly tool according to this application to an automated production line, a rotatable bottom platform 60 may be desirable, for example, after assembling a set of magnets by means of a robotic arm, the bottom platform 60 can be rotated by a certain angle to perform the assembly of the next set of magnets.

[0026] In some embodiments, the end cap 7 includes an inner peripheral wall 703, an outer peripheral wall 702, and a top wall 701 connecting the outer peripheral wall 702 and the inner peripheral wall 703. A plurality of side holes 72 are provided on the outer peripheral wall 702, and a plurality of top holes 71 are provided on the top wall 701. When the end cap 7 is assembled to the base 6, the outer peripheral wall 702 of the end cap is supported by the side walls 62 of the base 6, and the inner peripheral wall 703 surrounds the rotor shaft 41 of the permanent magnet motor rotor, specifically the second end 411 of the rotor shaft 41.

[0027] In some embodiments, the sidewall 62 of the base 6 has a plurality of threaded holes 81, which are located in the upper third of the sidewall 62 of the base 6, for example, near the upper edge of the sidewall 62, thereby corresponding to the position of the uppermost magnet segment. Although each magnet slot has three magnet segments in the illustrated embodiment, it should be understood that in alternative embodiments, each magnet slot may have any number of magnets greater than at both ends, and the position of the locking member 8 may be adjusted based on the number of magnets in the magnet slot. The locking member 8 may be a bolt that mates with the threaded holes 81, and for ease of operation, the locking member 8 may be a bolt that can be manually turned. In alternative embodiments, the locking member 8 may be a spring-based component that can be pulled up when the magnet is installed, and released after the magnet is installed so that it is spring-driven to apply top pressure.

[0028] In some embodiments, the assembly tool further includes a support ring 615 disposed at the bottom of the base, which supports the permanent magnet motor rotor when placed in the cavity. In some embodiments, the support ring 615 is made of a different material than the base 6 and has a higher hardness than the base 6. Since the permanent magnet motor rotor will be subjected to pressure during the subsequent riveting of the end plate 5, it is desirable to use a support ring 615 with greater hardness to support the permanent magnet motor rotor.

[0029] In some embodiments, the base 6, end cap 7, pressing member 74, locking member 8, and support ring 615 are all made of non-magnetic materials, thus not affecting the magnet. In some embodiments, the base 6, end cap 7, pressing member 74, and locking member 8 are made of aluminum-based materials or plastic, and the support ring 615 may be made of non-magnetic stainless steel. The support ring 615 may be heat-treated to increase its hardness.

[0030] In some embodiments, the end cap 7 further includes a plurality of positioning holes 73 disposed between a plurality of top holes 71, and the assembly tool further includes one or more positioning pins 75, which pass through the positioning holes 73 of the end cap and the positioning feature holes on the permanent magnet motor rotor to lock the angular position of the end cap 7 relative to the permanent magnet motor rotor, such that the top holes 71 and the side holes 72 are aligned with the magnets. In some embodiments, the plurality of side holes 72 and the plurality of top holes 71 are all rectangular, corresponding to the side and top surface shapes of the magnets, respectively. In alternative embodiments, when the magnets have other shapes, the plurality of side holes 72 and the plurality of top holes 71 may also adopt other shapes accordingly.

[0031] The specific embodiments described above are merely for the purpose of more clearly illustrating the principles of this application, wherein the various components are clearly shown or described to make the principles of this application easier to understand. Various modifications or variations can be easily made to this application by those skilled in the art without departing from the scope of this application. Therefore, it should be understood that all such modifications or variations should be included within the patent protection scope of this application.

Claims

1. An assembly tool for a multi-segment permanent magnet motor rotor, characterized in that: The assembly tool comprises: A base (6), the base (6) comprising a bottom wall (61) and a side wall (62), the bottom wall (61) and the side wall (62) defining a cavity for accommodating a permanent magnet motor rotor to be assembled; An end cover (7), the end cover (7) being mounted on the top of the base (6) and comprising a plurality of side holes (72) and a plurality of top holes (71), the plurality of side holes (72) and the plurality of top holes (71) being located in corresponding positions so that a section of magnetic steel can be inserted from the side hole (72) and pressed down through the corresponding top hole (71); A pressing member (74), the pressing member (74) being configured to press down the magnetic steel through the top hole (71); and A plurality of locking members (8) are arranged on the side wall (62) of the base, and the plurality of locking members (8) are configured to apply a top pressure from the side of the magnetic steel to fix the position of the magnetic steel.

2. The assembly tool according to claim 1, characterized in that: The base (6) is cylindrical, and the end cover (7) is round. The locking members (8), the side holes (72), and the top holes (71) are evenly distributed along the circumference and have corresponding positions.

3. The assembly tool according to claim 2, characterized in that: The bottom wall (61) of the base (6) is provided with a rotor shaft hole (612) for accommodating the rotor shaft, wherein the bottom wall (61) of the base (6) is provided with a bolt hole (611) for fixing to the bottom platform (60).

4. The assembly tool according to claim 2, characterized in that: The end cover (7) comprises an inner peripheral wall (703), an outer peripheral wall (702) and a top wall (701) connecting the outer peripheral wall (702) and the inner peripheral wall (703); the plurality of side holes (72) are arranged on the outer peripheral wall (702); the plurality of top holes (71) are arranged on the top wall (701); when the end cover (7) is assembled to the base (6), the outer peripheral wall (702) of the end cover is supported by the side wall (62) of the base (6); and the inner peripheral wall (703) surrounds the rotor shaft of the permanent magnet motor rotor.

5. The assembly tool according to any one of claims 1 to 4, characterized in that: A plurality of threaded holes (81) are arranged on the side wall (62) of the base, and the plurality of threaded holes (81) are located at the upper third of the side wall (62) in terms of height, and the locking member (8) is a bolt matching the threaded holes (81).

6. The assembly tool according to any one of claims 1 to 4, characterized in that: The assembly tool further comprises a support ring (615) arranged at the bottom of the base, and the permanent magnet motor rotor is supported by the support ring (615) when placed in the cavity.

7. The assembly tool according to claim 6, characterized in that: The support ring (615) is made of a material different from that of the base (6) and has a greater hardness than that of the base (6).

8. The assembly tool according to claim 6, characterized in that: The base (6), the end cover (7), the top pressure piece (74), the locking piece (8) and the support ring (615) are all made of non-magnetic materials, wherein the base (6), the end cover (7), the top pressure piece (74) and the locking piece (8) are made of aluminum-based materials or plastics, and the support ring (615) is made of non-magnetic stainless steel.

9. The assembly tool according to any one of claims 1 to 4, characterized in that: The end cover (7) further comprises a plurality of positioning holes (73) arranged between the plurality of top holes (71), and the assembly tool further comprises one or more positioning pins (75), wherein the one or more positioning pins (75) pass through the positioning holes (73) of the end cover (7) and the positioning feature holes on the permanent magnet motor rotor to lock the angular position of the end cover (7) relative to the permanent magnet motor rotor.

10. The assembly tool according to any one of claims 1 to 4, characterized in that: The plurality of side holes (72) and the plurality of top holes (71) are both rectangular.

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