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Built-in hybrid permanent magnet memory motor with local magnetic circuits in parallel

專利號
US11177706B2
公開日期
2021-11-16
申請人
SOUTHEAST UNIVERSITY（CN Nanjing）
發(fā)明人
Hui Yang; Hao Zheng; Heyun Lin
IPC分類
H02K1/27; H02K1/02; H02K1/14; H02K1/18
技術(shù)領(lǐng)域
permanent,magnet,magnets,rotor,magnetic,flux,stator,cobalt,core,motor
地域： Jiangsu

摘要

The present invention discloses a built-in hybrid permanent magnet memory motor with local magnetic circuits in parallel, including a hybrid permanent magnet rotor, a stator, armature windings and a rotating shaft. The armature windings are disposed on the stator, and the stator is disposed outside the hybrid permanent magnet rotor. The hybrid permanent magnet rotor includes a rotor core, first permanent magnets, second permanent magnets and V-shaped magnetic barriers. The rotor core is disposed outside the rotating shaft, the V-shaped magnetic barriers are disposed inside the rotor core, the V-shaped magnetic barriers with openings facing outwards are equally distributed in a circumferential direction of the rotor core, the first permanent magnet is disposed in the opening of the V-shaped magnetic barrier, the second permanent magnet is disposed between the two adjacent V-shaped magnetic barriers, a coercivity of the first permanent magnet is greater than a coercivity of the second permanent magnet, and cross sections of the first permanent magnets and the second permanent magnets are in a straight line. According to the present invention, the problem that the size design of the permanent magnet is limited by the space position is solved, and the anti-demagnetization ability of the low-coercivity permanent magnets and the flux weakening ability of the motor are enhanced.

說明書

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BACKGROUND Technical Field

The present invention relates to a permanent magnet memory motor, and in particular relates to a built-in hybrid permanent magnet memory motor with local magnetic circuits in parallel, belonging to the technical field of motors.

Related Art

In the field of motors, due to the inherent characteristics of ordinary permanent magnet materials (such as neodymium-iron-boron), the air-gap magnetic field in an ordinary permanent magnet synchronous motor (PMSM) basically remains constant, so the ordinary permanent magnet synchronous motor has a very limited range of speed control when used for electric operation, and is subject to certain restrictions when applied to wide-range-speed-control direct-drive occasions such as electric vehicles, aerospace and the like. Therefore, a magnetic-flux-adjustable permanent magnet motor, which aims at realizing the effective control of the air-gap magnetic field of the permanent magnet motor, has always been a hotspot and a difficulty in the field of motor research. A permanent magnet memory motor (hereinafter referred to as “memory motor”) is a novel magnetic-flux-controllable permanent magnet motor. The memory motor uses low-coercivity aluminum-nickel-cobalt permanent magnets to generate circumferential magnetic fields through stator windings or DC pulse windings, so that the magnetization of the permanent magnets is changed, the air-gap magnetic field is adjusted, and the permanent magnets have the characteristic that the flux density level can be memorized.

權(quán)利要求

1
What is claimed is:1. A built-in hybrid permanent magnet memory motor with local magnetic circuits in parallel, comprising a hybrid permanent magnet rotor, a stator, armature windings and a rotating shaft, the armature windings being disposed on the stator, and the stator being disposed outside the hybrid permanent magnet rotor, wherein the hybrid permanent magnet rotor comprises a rotor core, first permanent magnets, second permanent magnets and V-shaped magnetic barriers, the rotor core is disposed outside the rotating shaft, the V-shaped magnetic barriers are disposed inside the rotor core, the V-shaped magnetic barriers with openings facing outwards are equally distributed in a circumferential direction of the rotor core, wherein a thickness of a bottom of the V-shaped magnetic barrier is greater than a thickness of a side surface, the first permanent magnet is disposed in the opening of the V-shaped magnetic barrier, the second permanent magnet is disposed between the two adjacent V-shaped magnetic barriers, a coercivity of the first permanent magnet is greater than a coercivity of the second permanent magnet, and cross sections of the first permanent magnets and the second permanent magnets are in a straight line.2. The built-in hybrid permanent magnet memory motor with local magnetic circuits in parallel according to claim 1, wherein the rotor core is provided with a plurality of air slots with a straight-line cross section, and the first permanent magnets and the second permanent magnets are respectively disposed in the air slots.3. The built-in hybrid permanent magnet memory motor with local magnetic circuits in parallel according to claim 2, wherein a gap is provided between the first permanent magnet and the air slot, and the gap is located on a side of the first permanent magnet away from the rotating shaft.4. The built-in hybrid permanent magnet memory motor with local magnetic circuits in parallel according to claim 1, wherein the first permanent magnet is disposed with a length direction of its cross section in a radial direction of the circumference of the rotor core, and the second permanent magnet is disposed with a length direction of its cross section in a tangential direction of the circumference of the rotor core.5. The built-in hybrid permanent magnet memory motor with local magnetic circuits in parallel according to claim 1, wherein a symmetry axis of a cross section of the V-shaped magnetic barrier coincides with a length-direction symmetry axis of the cross section of the first permanent magnet, and the side surface of the V-shaped magnetic barrier is perpendicular to a length-direction symmetry axis of the cross section of the second permanent magnet.6. The built-in hybrid permanent magnet memory motor with local magnetic circuits in parallel according to claim 1, wherein the first permanent magnet is magnetized in a tangential direction of the circumference of the rotor core, and the second permanent magnet is magnetized in a radial direction of the circumference of the rotor core.7. The built-in hybrid permanent magnet memory motor with local magnetic circuits in parallel according to claim 1, wherein magnetizing directions of the adjacent first permanent magnets are opposite, and magnetizing directions of the adjacent second permanent magnets are opposite.8. The built-in hybrid permanent magnet memory motor with local magnetic circuits in parallel according to claim 1, wherein the numbers of the first permanent magnets, the second permanent magnets and the V-shaped magnetic barriers are the same and are an even number.9. The built-in hybrid permanent magnet memory motor with local magnetic circuits in parallel according to claim 1, wherein the first permanent magnet is a neodymium-iron-boron permanent magnet, and the second permanent magnet is an aluminum-nickel-cobalt permanent magnet.
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