Low-heavy rare earth permanent magnet material double-claw pole motor structure

Abstract

The application belongs to the technical field of electric machines, and particularly relates to a low-heavy-rare-earth permanent magnet double-claw pole motor structure. The application cuts the rotor yoke in half, divides the annular permanent magnet in the rotor into blocks in the circumferential direction, can reduce the area of the eddy current loop, thereby reducing the eddy current loss and inhibiting the demagnetization of the permanent magnet. The application comprises a double-claw pole motor body, wherein the double-claw pole motor body comprises a stator assembly, a rotor assembly and a casing assembly; the rotor yoke is cut into a plurality of block-shaped yoke blocks in the circumferential direction, and a gap is left between the adjacent two yoke blocks; the first claw pole rotor yoke and the second claw pole rotor yoke are oppositely and crossingly inserted into a sleeve structure; the annular permanent magnets are distributed in a block shape in the circumferential direction, and each block-shaped annular permanent magnet has the same structure; and in the claw pole rotor module, each yoke block corresponds to an annular permanent magnet block; one side of the annular permanent magnet block is in contact with the top end of the corresponding yoke block of the first claw pole rotor, and the other side is attached to the claw pole root of the second claw pole rotor.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and in particular relates to a dual-claw pole motor structure made of low-heavy rare earth permanent magnet material. Background Technology

[0002] Dual-pole motors have high torque density, and due to their structural characteristics, they can be manufactured using SMC soft magnetic material, making assembly simple—just assembling the various parts. However, when a dual-pole motor operates at high frequencies, the rotor experiences high core losses, causing the motor temperature to rise. This leads to irreversible demagnetization of the permanent magnets, negatively impacting normal motor operation and increasing operating costs. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a dual-claw pole motor structure made of low-heavy rare-earth permanent magnet material. It employs a novel rotor structure and permanent magnet arrangement, dividing the rotor yoke into equal sections and circumferentially segmenting the annular permanent magnet in the middle of the rotor. This reduces the area of ​​the eddy current loop, thereby reducing eddy current losses and suppressing permanent magnet demagnetization.

[0004] To achieve the above objectives, the present invention adopts the following technical solution, including a dual-claw pole motor body; the dual-claw pole motor body includes a stator assembly, a rotor assembly, and a housing assembly.

[0005] The rotor assembly includes two claw pole rotors: a first claw pole rotor and a second claw pole rotor, a permanent magnet between rotor poles, an annular permanent magnet between rotors, and a rotating shaft; wherein each claw pole rotor includes a rotor claw pole root, a rotor yoke, and a rotor claw pole tip, wherein the rotor claw pole root, tip, and yoke are integrally cast; the two claw pole rotors are positioned opposite each other and are cross-assembled at different angles to form a claw pole rotor module.

[0006] The rotor yoke is characterized in that it is cut into multiple block-shaped yoke blocks along the circumferential direction, and a gap is left between adjacent yoke blocks; the rotor yoke of the first claw pole rotor and the rotor yoke of the second claw pole rotor are positioned opposite each other and are cross-inserted into a sleeve structure.

[0007] The annular permanent magnets are distributed in blocks along the circumference, and each annular permanent magnet block has the same structure.

[0008] Furthermore, in the claw pole rotor module, each yoke block corresponds to an annular permanent magnet block; one side of the annular permanent magnet block contacts the top of the corresponding rotor yoke block of the first claw pole rotor, and the other side is attached to the claw pole root of the second claw pole rotor. That is, the rotor yoke of one claw pole rotor is firmly fixed to the claw pole root of another claw pole rotor, clamping and fixing it.

[0009] Furthermore, a non-magnetic protective sleeve is provided outside the rotor yoke and / or the annular permanent magnet.

[0010] Compared with the prior art, the present invention has the following advantages.

[0011] The present invention relates to a dual-claw pole motor, which circumferentially cuts the rotor yoke and the annular permanent magnet placed between the rotors. The annular permanent magnet is pressed against the root of the claw pole of the other claw pole rotor by the rotor yoke. This cuts the originally large eddy current loop into several smaller eddy current loops, thereby reducing the eddy current loss of the motor, reducing the motor heat generation, suppressing the irreversible demagnetization caused by the temperature rise of the low heavy rare earth permanent magnet due to eddy current loss, and enhancing the stability of the motor during operation. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0013] Figure 1 This is a schematic diagram of the overall structure of the dual-claw pole motor of the present invention.

[0014] Figure 2 This is an exploded view of the dual-claw pole motor structure of the present invention.

[0015] Figure 3-1 The overall structure diagram of the stator of the dual-claw pole motor of this invention.

[0016] Figure 3-2 Exploded view of the overall structure of the stator.

[0017] Figure 3-3 Diagram of a single stator.

[0018] Figure 4 This is a structural diagram of the dual-claw pole motor winding of the present invention.

[0019] Figure 5-1 The rotor structure diagram of the dual-claw pole motor of this invention.

[0020] Figure 5-2 Side view of the rotor structure of the dual-claw pole motor of the present invention.

[0021] Figure 5-3 Exploded view of the rotor structure of this invention.

[0022] Figure 5-4 and 5-5 All of these are structural diagrams of a single rotor of the present invention.

[0023] Figure 6-1 This is a schematic diagram of the explosion of the permanent magnet of the present invention.

[0024] Figure 6-2 This is a schematic diagram of the permanent magnet structure and assembly of the dual-claw pole motor of the present invention.

[0025] Figure 6-3 This is a schematic diagram of the assembly of the interpole permanent magnet and the rotor of the present invention.

[0026] In the diagram, 1 is the motor stator, 2 is the winding, 3 is the air gap, 4 is the motor rotor, 5 is the annular permanent magnet, 6 is the inter-pole permanent magnet, 7 is the shaft, 8 is the stator yoke, 9 is the stator claw pole root, 10 is the stator claw pole tip, 11 is the rotor claw pole root, 12 is the rotor yoke, 13 is the rotor claw pole tip, 14 is the winding in / out port on the stator, 15 is the magnetic barrier, 16 is the winding inlet end, 17 is the winding outlet end, 18 is the housing, 19 is the end cover, 20 is the bearing, 21 is the junction box, and 22 is the base. Detailed Implementation

[0027] like Figures 1 to 6-3 As shown, a dual-claw pole motor with claw poles for both the stator and rotor includes: a dual-claw pole motor body; the dual-claw pole motor body includes a stator assembly, a rotor assembly, and a housing assembly.

[0028] The rotor assembly includes two claw pole rotors: a first claw pole rotor and a second claw pole rotor, a permanent magnet between rotor poles, an annular permanent magnet between rotors, and a rotating shaft 7; wherein each claw pole rotor includes a rotor claw pole root 11, a rotor yoke 12, and a rotor claw pole tip 13, wherein the rotor claw pole root 11, tip, and yoke are integrally cast; the two claw pole rotors are positioned opposite each other and are cross-assembled at different angles to form a claw pole rotor module.

[0029] The improvements are as follows: the rotor yoke 12 is cut into multiple block-shaped yoke blocks along the circumference, with gaps between adjacent yoke blocks; the rotor yoke 12 of the first claw pole rotor and the rotor yoke 12 of the second claw pole rotor are positioned opposite each other and interlocked in a sleeve structure; the annular permanent magnets are distributed in blocks along the circumference, and each annular permanent magnet block has the same structure; and in the claw pole rotor module, each yoke block corresponds to an annular permanent magnet block; one side of the annular permanent magnet block contacts the top of the corresponding rotor yoke 12 block of the first claw pole rotor, and the other side is attached to the claw pole root of the second claw pole rotor. That is, the rotor yoke 12 of one claw pole rotor is firmly fixed to the claw pole root of the other claw pole rotor, clamping and fixing it.

[0030] This invention redesigns and modifies the structure of the claw pole rotor yoke 12 and the annular permanent magnet between the rotors in a dual-claw pole permanent magnet synchronous motor. Specifically, the rotor yoke 12 is cut into equal parts, and the annular permanent magnet is circumferentially divided into blocks. This cuts the eddy current loop, suppresses motor heating, and enhances the demagnetization resistance of the low-heavy rare earth permanent magnet.

[0031] Specifically, Example 1 is a specific implementation mode, which can be used as one implementation method. At the same time, other implementation methods can also be adopted.

[0032] The structure of a dual-claw pole motor includes a stator assembly, a rotor assembly, and a housing assembly.

[0033] The rotor assembly of the dual-claw pole motor includes two claw pole rotors, a permanent magnet between the rotor poles, an annular permanent magnet between the rotors, and a rotating shaft 7.

[0034] Two claw pole rotors are assembled opposite each other at different angles to form a complete claw pole rotor module.

[0035] The claw pole rotor includes a rotor claw pole root 11, a rotor yoke 12, and a rotor claw pole tip 13, wherein the rotor claw pole root 11, tip, and yoke are integrally cast.

[0036] A permanent magnet is placed between the rotor claw poles, and a tangential permanent magnet structure is adopted. That is, the permanent magnet is placed between the tips 13 of two adjacent rotor claw poles designed in this invention, and the magnetization direction is tangential magnetization.

[0037] A ring-shaped permanent magnet is also placed between the rotors, and the magnetization direction is axial magnetization. The rotor yoke 12 and the ring-shaped permanent magnet are cut into several equal pieces along the circumferential direction. The cut ring-shaped permanent magnet is divided into two parts, and each part is placed between adjacent cut rotor yokes 12. Every two cut ring-shaped permanent magnets are separated by a rotor yoke 12 and are closely attached to the root of the rotor claw pole 11.

[0038] Each cut rotor yoke 12 corresponds to a cut annular permanent magnet, and the inner and outer diameters of the rotor yoke 12 and the annular permanent magnet are kept equal. One side of the cut annular permanent magnet contacts the top of the rotor yoke 12, and the other side is tightly attached to the claw pole root of another rotor, that is, it is firmly fixed to the claw pole root of another claw pole rotor by the rotor yoke 12 and clamped and fixed.

[0039] Meanwhile, in order to prevent the permanent magnet from centrifuging when the motor is running at high speed, a non-magnetic protective sleeve can be added to the rotor yoke 12 and the outer periphery of the annular permanent magnet to provide protection.

[0040] The assembly method of the present invention is centered on the rotating shaft 7, with two claw pole rotors and a cut annular permanent magnet fitted on the rotating shaft 7; the interpole permanent magnet is placed between the claw pole tips 13 of the rotor, and the annular permanent magnet is pushed against the claw pole root of another rotor by the rotor yoke 12; the claw pole stator is fitted outside the claw pole rotor, with an air gap 3 in between.

[0041] Example 2: This example is a specific implementation mode, which can be used as one implementation method. At the same time, other implementation methods can also be used.

[0042] Without damaging the stator structure, the motor has winding in / outlet ports 14 drilled into the stator yoke 8.

[0043] The motor winding 2 is wound between the stator claw tip 10 and the stator yoke 8, and is fixed by the stator claw root 9 on both sides.

[0044] The inlet end 16 and outlet end 17 of the motor winding 2 are located at one place, and are led out from the winding inlet / outlet port 14 and then connected to the junction box 21.

[0045] The stator 1 is made of SMC soft magnetic material.

[0046] The segmented motor stator consists of two opposing stators 1 combined into one segment, with the segments differing by both electrical and mechanical angles. The angle relationships are: electrical angle = 360° ÷ number of phases = number of motor pole pairs × mechanical angle. The motor rotor is composed of two claw-pole rotors 4 arranged in a cross configuration. The claw-pole rotor 4 includes a claw root 11, a yoke 12, and a claw tip 13. The yoke is circumferentially cut into two equal parts, distributed on the claw roots of the two claw rotors. The divided yoke 12 is integrally cast with the claw root 11 and the claw tip 13. The cut yoke 12 is staggered and cross-assembled, and the entire motor rotor is fixed by a shaft 7. The permanent magnets used in the motor consist of two parts: an annular permanent magnet 5 resting between the claw roots 11 on the rotor yoke 12, and interpole permanent magnets 6 placed between the rotor claws.

[0047] The annular permanent magnet 5 is cut into several equal pieces along its circumference. After being divided, the annular permanent magnet pieces are placed on the top of the cut rotor yoke and then pressed against the root of another claw-pole rotor. Each pair of cut annular permanent magnet pieces 5 is separated by a rotor yoke 12 and tightly adhered to the root 11 of the rotor claw pole. Each cut rotor yoke 12 corresponds to one cut annular permanent magnet 5, and the inner and outer diameters of the rotor yoke 12 and the annular permanent magnet 5 are equal. One side of the cut annular permanent magnet 5 contacts the top of the rotor yoke 12, and the other side is tightly adhered to the root 11 of the other claw-pole rotor 4, thus being firmly fixed to the root 11 of the other claw-pole rotor 4 by the rotor yoke 12. To prevent the annular permanent magnet 5 from falling off during high-speed operation, a protective sleeve of non-magnetic material can be added around the annular permanent magnet 5 and the rotor yoke 5.

[0048] The annular permanent magnet 5 is magnetized axially. The inter-pole permanent magnet 6 adopts a tangential permanent magnet structure. One side of the inter-pole permanent magnet 6 rests against the side of the rotor claw pole tip 13, and the other side rests against the side of the adjacent rotor claw pole tip 13. It is clamped and fixed by two adjacent rotor claw pole tips 13.

[0049] The magnetization direction of the interpole permanent magnet 6 is tangential, which has a strong resistance to demagnetization.

[0050] The permanent magnet material uses rare earth permanent magnet material with low heavy rare earth content, which significantly reduces the cost compared to traditional rare earth permanent magnet materials. There are two motor end covers 19, which are fixed to both sides of the housing 18 with screws.

[0051] The end cover 19 has a bearing chamber in the middle, where the motor bearing 20 is placed.

[0052] The rotor 4 and the annular permanent magnet 5 are fixed by a rotating shaft, and the interpole permanent magnet 6 is fixed by the rotor claw tip 13. The rotating shaft then forms the rotating part of the motor through the bearing 20 installed in the bearing chamber.

[0053] The motor housing 18, junction box 21, and base 22 are integrally cast. The housing 18 is equipped with screw interfaces to fix the end cover 19. The input / output terminals of the motor winding 2 are led out from the winding input / output port 14 on the stator 1. Channels for placing the input / output terminals of the winding 2 are cut out inside the housing 18. Finally, the input / output terminals of the winding 2 are collected in the junction box 21.

[0054] When leading winding 2 to junction box 21, necessary winding protection and insulation measures must be added to prevent winding damage and leakage. Analysis and calculations can verify the feasibility and rationality of the dual-claw pole motor.

[0055] The above description is only one embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention, such as changing this embodiment to a multi-phase multi-pole double claw pole permanent magnet synchronous motor, changing the rotor claw pole shape, thickness and number of cutting segments, rotor yoke cutting method, and changing the placement position of permanent magnets, should be included within the protection scope of the present invention.

Claims

1. A dual-claw pole motor structure using low-heavy rare-earth permanent magnet materials, comprising a dual-claw pole motor body; the dual-claw pole motor body comprising a stator assembly, a rotor assembly, and a housing assembly; the rotor assembly comprising two claw pole rotors: a first claw pole rotor and a second claw pole rotor, an inter-pole permanent magnet, an annular permanent magnet between the rotors, and a rotating shaft; wherein, Each claw pole rotor includes a claw pole root, a yoke, and a claw pole tip, wherein the claw pole root, tip, and yoke are integrally cast; two claw pole rotors are assembled in opposite positions and at different angles to form a claw pole rotor module; characterized in that: The rotor yoke is cut into multiple block-shaped yoke blocks along the circumferential direction, and a gap is left between adjacent yoke blocks; the rotor yokes of the first claw pole rotor and the rotor yokes of the second claw pole rotor are positioned opposite each other and are cross-inserted into a sleeve structure. The annular permanent magnets are distributed in blocks along the circumference, and each annular permanent magnet block has the same structure. Furthermore, in the claw pole rotor module, each yoke block corresponds to an annular permanent magnet block; one side of the annular permanent magnet block contacts the top of the corresponding rotor yoke block of the first claw pole rotor, and the other side is attached to the claw pole root of the second claw pole rotor.

2. The dual-claw pole motor structure using low-heavy rare-earth permanent magnet material according to claim 1, characterized in that: A non-magnetic protective sleeve is provided outside the rotor yoke and / or the annular permanent magnet.

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