A permanent magnet fixing structure with an axial limiting groove

Abstract

This invention provides a permanent magnet fixing structure with axial limiting grooves, belonging to the field of permanent magnet motor technology. It includes a rotor core and several permanent magnets. The inner wall of the rotor core has several magnetic steel grooves for accommodating the permanent magnets. Locking parts are provided on both sides of the magnetic steel grooves. Each locking part includes a support base along the bottom of the magnetic steel groove. The side wall of the support base has an axial limiting groove that slides with adjacent permanent magnets. The side wall of the support base has a baffle that fits against the side wall of the magnetic steel groove. The bottom of the support base has fasteners that are fixedly connected to the magnetic steel grooves. This invention, through the ingenious design of the axial limiting grooves and limiting rails, supplemented by the positive pressure provided by bolt tightening, and by pressing the permanent magnets with the support base, further enhances the limiting effect, effectively restricting the movement of the permanent magnets, improving fixing reliability, and making the fixing more secure and stable. This results in a high-performance, high-reliability, and cost-effective permanent magnet fixing structure.

Description

Technical Field

[0001] This utility model provides a permanent magnet fixing structure with an axial limiting groove, belonging to the field of permanent magnet motor technology. Background Technology

[0002] Permanent magnet motors are widely used in modern industry and new energy vehicles due to their high power density and high efficiency. As a key component of permanent magnet motors, the reliability of the permanent magnet's fixation directly affects the motor's performance and lifespan. Especially under high-speed operating conditions, permanent magnets are subjected to enormous centrifugal forces, electromagnetic forces, and thermal stress, making them prone to displacement, detachment, or damage.

[0003] The existing method of fixing permanent magnets is mainly by adhesive bonding, which uses glue to bond the permanent magnets to the surface of the rotor core. The adhesive bonding process is simple, but the adhesive is prone to aging and failure in high-temperature environments, which leads to a decrease in fixing reliability, weak limiting effect, and difficulty in stably and firmly restricting the movement of permanent magnets.

[0004] Based on this, the present invention provides a permanent magnet fixing structure with an axial limiting groove. Utility Model Content

[0005] The technical problem solved by this utility model is that: relying solely on adhesive to bond the permanent magnet to the surface of the rotor core reduces the reliability of the fixation, weakens the limiting effect, and makes it difficult to stably and firmly restrict the movement of the permanent magnet.

[0006] To solve the technical problem, the present invention provides the following technical solution: a permanent magnet fixing structure with an axial limiting groove, comprising a rotor core and a plurality of permanent magnets. The inner sidewall of the rotor core is provided with a plurality of magnetic steel grooves for accommodating the permanent magnets. Locking parts for locking the permanent magnets are provided on both sides of the magnetic steel grooves. The locking parts include a support base along the bottom of the magnetic steel groove. The sidewall of the support base is provided with an axial limiting groove that is slidably connected to an adjacent permanent magnet. The sidewall of the support base is provided with a baffle that fits against the sidewall of the magnetic steel groove for blocking the permanent magnets. The bottom of the support base is provided with a fastener that is fixedly connected to the magnetic steel groove.

[0007] Furthermore, the permanent magnet has limiting rails on both sides that match the axial limiting grooves.

[0008] Furthermore, the top of the support base is provided with a rubber pad that fits against the bottom of the magnet groove.

[0009] Furthermore, the fastener is a bolt made of non-magnetic material, the support base is provided with mounting holes through which the bolt passes, and the rotor core is provided with threaded holes that mate with the bolt.

[0010] Furthermore, the cross-sectional shape of the axial limiting groove is one of trapezoidal, rectangular, or arc-shaped.

[0011] Furthermore, the axial limiting groove has a depth of 0.5mm to 2mm and a width of 3mm to 8mm.

[0012] The beneficial effects of this utility model are:

[0013] This invention utilizes a cleverly designed axial limiting groove and limiting rail, supplemented by the positive pressure provided by bolt tightening, to further enhance the limiting effect by pressing the permanent magnet with the support seat. This effectively restricts the movement of the permanent magnet, improves the reliability of the fixation, and makes the fixation more secure and stable. It constructs a high-performance, high-reliability, and cost-effective permanent magnet fixing structure, which is particularly suitable for high-speed, high-power-density permanent magnet motors. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a permanent magnet fixing structure with an axial limiting groove according to the present invention. Figure 1 .

[0015] Figure 2 This is a schematic diagram of a permanent magnet fixing structure with an axial limiting groove according to the present invention. Figure 2 .

[0016] Figure 3 This is a schematic diagram of a permanent magnet fixing structure with an axial limiting groove according to the present invention. Figure 3 .

[0017] Figure 4 This is a partially enlarged view of a permanent magnet fixing structure with an axial limiting groove according to this utility model.

[0018] 1. Rotor core; 2. Permanent magnet; 3. Magnet slot; 4. Locking part; 5. Support seat; 6. Axial limiting slot; 7. Baffle; 8. Fastener; 9. Limiting rail; 10. Rubber pad; 11. Mounting hole. Detailed Implementation

[0019] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly mentioned in this specification are defined relative to their structure and are relative concepts. Therefore, they may vary depending on their location and usage; thus, these or other directional terms should not be interpreted as restrictive terms.

[0020] The singular forms “a,” “the,” and “the” used in this specification are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes one or more of the associated listed items, any or all possible combinations thereof.

[0021] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0022] According to the appendix Figure 1 , 2 As shown: This utility model provides a permanent magnet fixing structure with axial limiting grooves: including a rotor core 1 and several permanent magnets 2. The inner side wall of the rotor core 1 is provided with several magnetic steel grooves 3 for accommodating the permanent magnets 2. A thermally conductive adhesive layer is filled in the gap between the permanent magnets 2 and the magnetic steel grooves 3. The thermally conductive adhesive is injected into the gap between the permanent magnets 2 and the magnetic steel grooves 3 through a vacuum pressure impregnation process, and then heated and cured to form a thermally conductive adhesive layer, which can not only enhance the fixation, but also improve the heat dissipation path from the permanent magnets 2 to the rotor core 1.

[0023] As per the instruction manual Figure 1 , 3 As shown: The magnetic steel groove 3 is provided with locking parts 4 on both sides for locking the permanent magnet 2. The locking part 4 includes a support base 5 along the bottom of the magnetic steel groove 3. The side wall of the support base 5 is provided with an axial limiting groove 6 that slides with the adjacent permanent magnet 2. The cross-sectional shape of the axial limiting groove 6 is one of trapezoidal, rectangular, and arc-shaped, preferably trapezoidal to provide better shear resistance. The groove depth of the axial limiting groove 6 is 0.5mm to 2mm, and the groove width is 3mm to 8mm. This size range can ensure the limiting effect without excessively weakening the strength of the support base 5. The side wall of the support base 5 is provided with a baffle 7 that fits against the side wall of the magnetic steel groove 3 to block the permanent magnet 2. The two side walls of the permanent magnet 2 are provided with limiting rails 9 that match the axial limiting groove 6. Specifically, the axial limiting groove 6, together with the baffle 7, limits the permanent magnet and improves the stability of the overall structure at high speed.

[0024] As per the instruction manual Figure 3 , 4 As shown: The top of the support base 5 is provided with a rubber pad 10 that fits against the bottom of the magnet slot 3. The bottom of the support base 5 is provided with a fastener 8 that is fixedly connected to the magnet slot 3. The fastener 8 is a bolt made of non-magnetic material to prevent additional eddy current loss. The support base 5 is provided with a mounting hole 11 through which the bolt passes. The rotor core 1 is provided with a threaded hole that matches the bolt. The bolt is an A4-80 stainless steel bolt with a specification of M4, used to fasten the locking part 4 to the rotor core 1.

[0025] The principle of this utility model

[0026] Interconnection methods and assembly processes:

[0027] The permanent magnet 2 is placed into the magnetic slot 3 from the axial direction of the rotor core 1;

[0028] By using the locking part 4, the support base 5 is moved along the bottom of the magnet groove. During this process, the limiting rail 9 on the permanent magnet 2 needs to be precisely aligned and inserted into the axial limiting groove 6 until the baffle 7 is in contact with the side wall of the support base 5, thus initially achieving the initial circumferential and radial limiting of the permanent magnet 2.

[0029] Using a torque wrench, tighten the stainless steel bolts to the specified torque (e.g., 3 N·m) to firmly fix the support seat 5 onto the rotor core 1. The tightening force of the bolts ultimately presses the permanent magnet 2 through the support seat 5, and the axial limiting groove 6 and the limiting rail 9 effectively restrict the movement of the permanent magnet 2, making it firmly and stably fixed.

[0030] In summary, this utility model, through the ingenious design of the axial limiting groove 6 and the limiting rail 9, supplemented by the positive pressure provided by the bolt fastening, and the support seat 5 pressing the permanent magnet 2, further enhances the limiting effect, effectively restricts the movement of the permanent magnet 2, improves the fixing reliability, and makes the fixing more firm and stable. It constructs a high-performance, high-reliability and cost-effective permanent magnet fixing solution, which is particularly suitable for high-speed, high-power-density permanent magnet motors.

[0031] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A permanent magnet fixing structure with axial limiting slot, comprising a rotor core (1) and a plurality of permanent magnets (2), characterized in that: The inner wall of the rotor core (1) is provided with a plurality of magnetic steel grooves (3) for accommodating the permanent magnets (2). The magnetic steel grooves (3) are provided with locking parts (4) on both sides for locking the permanent magnets (2). The locking part (4) includes a support seat (5) along the bottom of the magnetic steel groove (3). The side wall of the support seat (5) is provided with an axial limiting groove (6) that slides with the adjacent permanent magnets (2). The side wall of the support seat (5) is provided with a baffle (7) that fits against the side wall of the magnetic steel groove (3) to block the permanent magnets (2). The bottom of the support seat (5) is provided with a fastener (8) that is fixedly connected to the magnetic steel groove (3).

2. The permanent magnet fixing structure with axial limiting slot according to claim 1, characterized in that: The permanent magnet (2) has limiting rails (9) on both sides that match the axial limiting groove (6).

3. The permanent magnet fixing structure with axial limiting slot according to claim 1, characterized in that: The top of the support base (5) is provided with a rubber pad (10) that fits against the bottom of the magnetic steel groove (3).

4. The permanent magnet fixing structure with an axial limiting groove according to claim 1, characterized in that: The fastener (8) is a bolt made of non-magnetic material, the support base (5) is provided with a mounting hole (11) through which the bolt passes, and the rotor core (1) is provided with a threaded hole that mates with the bolt.

5. The permanent magnet fixing structure with axial limiting slot according to claim 1, characterized in that: The cross-sectional shape of the axial limiting groove (6) is one of trapezoidal, rectangular, or arc-shaped.

6. The permanent magnet fixing structure with axial limiting slot according to claim 1, characterized in that: The axial limiting groove (6) has a groove depth of 0.5 mm to 2 mm and a groove width of 3 mm to 8 mm.

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