Self-shielding magnetic pole block motor

Abstract

The invention discloses a self-shielding magnetic pole block motor, and belongs to the technical field of motors. The motor comprises a stator and a permanent magnet rotor, the permanent magnet rotor is arranged in the stator, and an independent air gap is formed between the stator and the permanent magnet rotor. And three-phase armature windings are distributed on the stator teeth. The permanent magnet rotor comprises an outer side triangular magnetic block, a middle quadrilateral magnetic block, an inner side triangular magnetic block and a permanent magnet inner side non-magnetic aluminum piece. By adjusting the magnetizing directions of different magnetic blocks, the magnetic circuit is guided, so that the stator coil in each stator slot is subjected to stable torque, and the stable rotation of the motor is ensured. The Halbach permanent magnet rotor has the magnetism gathering effect of the Halbach permanent magnet rotor structure, self-shielding can be formed, the magnetic leakage phenomenon almost does not exist on the inner side of the permanent magnet, and the air gap flux density is enhanced, so that the electromagnetic torque quality of the motor is improved.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and more particularly to a self-shielded magnetic pole segmented motor. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs), as a type of drive, are widely used in various industrial fields due to their high power density and excellent speed regulation performance. The research and development of high-efficiency, high-power-density PMSMs has a history of over 20 years both domestically and internationally, and they are gradually replacing asynchronous motors in applications such as electric vehicles, lathes, and marine electric propulsion. As the application fields of PMSMs expand, various applications not only demand higher individual performance characteristics from the motors but also require better overall performance. For example, applications such as high-power-density joint drives in robots and aerospace not only place higher demands on the power density of the motors but also require them to possess excellent characteristics such as low torque ripple and high output torque.

[0003] Traditional Halbach pole arrays used in permanent magnet synchronous motors typically consist of alternating permanent magnets magnetized in four directions. Compared to radially magnetized pole arrays, they offer advantages such as better shielding, higher pole utilization, and lower harmonic content in the air gap magnetic flux density. However, magnetic leakage occurs on the inner side of the rotor. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a self-shielded magnetic pole segmented motor that solves the problem of magnetic leakage in the rotor back iron of the traditional Halbach structure and its deformation. By planning the magnetic circuit direction to form a closed loop, the utilization rate of permanent magnets is improved, and the electromagnetic torque characteristics of the motor are further improved.

[0005] Technical solution: A self-shielded magnetic pole segmented motor includes a stator and a permanent magnet rotor. The permanent magnet rotor is arranged inside the stator, forming an independent air gap between the stator and the permanent magnet rotor. Three-phase armature windings are distributed on the stator teeth. The permanent magnet rotor is provided with segmented magnetic poles and non-magnetic components on the inner side. By adjusting the magnetization direction of each segment of the magnetic blocks, the magnetic circuit is guided, so that the stator coil in each stator slot is subjected to a stable torque, thereby achieving stable rotation of the motor.

[0006] Preferably, the segmented magnetic poles are composed of an outer triangular magnetic block, a middle quadrilateral magnetic block, and an inner triangular magnetic block.

[0007] Preferably, the outer triangular magnetic blocks are magnetized in a clockwise cyclical manner in the order of bottom, bottom, top, top; the middle quadrilateral magnetic blocks are magnetized in a clockwise cyclical manner in the order of bottom, right, top, left; and the inner triangular magnetic blocks are magnetized in a clockwise cyclical manner in the order of left, right, right, left. Among these, the top and bottom are magnetized in the radial direction, and the left and right are magnetized in the tangential direction.

[0008] Preferably, the segmented magnetic poles are composed of stacked silicon steel sheets or are made of materials with three-dimensional isotropy.

[0009] Preferably, the non-magnetic components are made of aluminum or stainless steel.

[0010] Preferably, the segmented magnetic poles are magnetized using a Halbach-like method.

[0011] Preferably, the three-phase armature winding adopts a single-tooth concentrated winding.

[0012] Compared with the prior art, the significant advantages of this invention are as follows: 1. The permanent magnet rotor of this invention adopts a three-layer block structure for its magnetic poles: an outer triangular block, a middle quadrilateral block, and an inner triangular block. Compared with the traditional Halbach permanent magnet, it has a higher utilization rate and can reduce the cost of the motor. 2. The permanent magnet rotor of this invention adopts a Halbach-like magnetization method, which has the magnetic concentration advantage of Halbach permanent magnet structure. The permanent magnet block structure has almost no magnetic leakage inside, which can improve the torque density of the motor. 3. The permanent magnet blocks of the permanent magnet rotor of the present invention are modular structures with cyclic magnetization, which facilitates processing, production and assembly. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the motor and a schematic diagram of the winding connection of the present invention; Figure 2 This is a schematic diagram of the magnetization direction of the outermost triangular magnetic block of the motor of the present invention; Figure 3 This is a schematic diagram of the magnetization direction of the central quadrilateral magnetic block in the motor of the present invention; Figure 4 This is a schematic diagram of the magnetization direction of the inner triangular magnetic block of the motor of the present invention. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention.

[0016] like Figure 1As shown, a self-shielded magnetic pole segmented motor of the present invention includes a stator 1 and a permanent magnet rotor 2. The permanent magnet rotor 2 is arranged inside the stator, and single-tooth concentrated windings are wound on the stator teeth. The inner side of the permanent magnet rotor 2 is a non-magnetic component, forming an independent air gap 3 between the stator 1 and the permanent magnet rotor 2. Three-phase armature windings 4 are distributed on the stator teeth. The permanent magnet rotor includes an outer triangular magnetic block 2-1, a middle quadrilateral magnetic block 2-2, an inner triangular magnetic block 2-3, and a non-magnetic aluminum component 2-4 on the inner side of the permanent magnet body. The magnetic poles of the permanent magnet rotor adopt a Halbach-like magnetization method.

[0017] In this embodiment, the permanent magnet rotor 2 preferably has segmented magnetic poles, which are composed of an outer triangular magnetic block 2-1, a middle quadrilateral magnetic block 2-2, and an inner triangular magnetic block 2-3. In this embodiment, preferably, the outer triangular magnetic block 2-1 is magnetized in a clockwise cyclical manner, following the order of bottom, bottom, top, top, as follows: Figure 2 As shown.

[0018] In this embodiment, preferably, the magnetization of the central quadrilateral magnetic block 2-2 is performed in a clockwise cyclical manner, following the order of bottom, right, top, and left. Figure 3 As shown.

[0019] In this embodiment, preferably, the inner triangular magnetic blocks 2-3 are magnetized in a clockwise cyclical manner, following the order of left, right, right, left. Figure 4 As shown.

[0020] In this embodiment, preferably, the magnetic conductive components (i.e., the outer triangular magnetic block 2-1, the middle quadrilateral magnetic block 2-2, and the inner triangular magnetic block 2-3) are made of stacked silicon steel sheets or are made of materials with three-dimensional isotropy.

[0021] In this embodiment, preferably, the non-magnetic component (i.e., the non-magnetic aluminum part 2-4) is made of aluminum or stainless steel.

[0022] By adjusting the magnetization direction of different magnetic blocks, the magnetic circuit is guided, so that the stator coil in each stator slot is subjected to a stable torque, thereby ensuring the stable rotation of the motor.

[0023] This motor has a simple structure and not only has the magnetic focusing effect of the Halbach permanent magnet rotor structure, but also forms a self-shielding through regular magnetization, achieving almost no magnetic leakage inside the permanent magnet body, enhancing the air gap magnetic density, and thus improving the electromagnetic torque quality of the motor.

[0024] The above embodiments are merely illustrative of the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. For example, the block method can form various structures, and the central quadrilateral permanent magnet block can be changed to a pentagon or a hexagon. Furthermore, this concept can also be extended to various motors such as axial flux and linear motors. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of this invention.

Claims

1. A self-shielded magnetic pole segmented motor, characterized in that, It includes a stator (1) and a permanent magnet rotor (2). The permanent magnet rotor (2) is arranged inside the stator, forming an independent air gap (3) between the stator (1) and the permanent magnet rotor (2). Three-phase armature windings (4) are distributed on the stator teeth. The permanent magnet rotor (2) is provided with segmented magnetic poles and non-magnetic components on the inside. By adjusting the magnetization direction of each segment of the magnetic blocks, the magnetic circuit is guided, so that the stator coil in each stator slot is subjected to a stable torque, thereby achieving stable rotation of the motor.

2. The self-shielded magnetic pole segmented motor according to claim 1, characterized in that, The segmented magnetic poles consist of an outer triangular magnetic block (2-1), a middle quadrilateral magnetic block (2-2), and an inner triangular magnetic block (2-3).

3. The self-shielded magnetic pole segmented motor according to claim 1, characterized in that, The outer triangular magnetic block (2-1) is magnetized in a clockwise cycle following the order of bottom, bottom, top, top; the middle quadrilateral magnetic block (2-2) is magnetized in a clockwise cycle following the order of bottom, right, top, left; the inner triangular magnetic block (2-3) is magnetized in a clockwise cycle following the order of left, right, right, left; where top and bottom are magnetized radially, and left and right are magnetized tangentially.

4. The self-shielded magnetic pole segmented motor according to any one of claims 1-3, characterized in that, The segmented magnetic poles are composed of stacked silicon steel sheets or materials with three-dimensional isotropy.

5. The self-shielded magnetic pole segmented motor according to any one of claims 1-3, characterized in that, For non-magnetic components, aluminum or stainless steel are used.

6. The self-shielded magnetic pole segmented motor according to any one of claims 1-3, characterized in that, The segmented magnetic poles are magnetized using a Halbach-like method.

7. The self-shielded magnetic pole segmented motor according to any one of claims 1-3, characterized in that, The three-phase armature winding adopts a single-tooth concentrated winding.

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