CN-121984260-A - Double-three-phase asymmetric Halbach array permanent magnet fault-tolerant motor

CN121984260ACN 121984260 ACN121984260 ACN 121984260ACN-121984260-A

Abstract

The invention discloses a double three-phase asymmetric Halbach array permanent magnet fault-tolerant motor, and belongs to the field of permanent magnet motor design. The stator comprises a stator core, double three-phase centralized windings, armature teeth and fault tolerant teeth. The rotor comprises a rotor core, an asymmetric Halbach array permanent magnet and a magnetic barrier, wherein the outer circumference of the rotor core is provided with a half-opening magnetic barrier with an opening facing the air gap side, the asymmetric Halbach array permanent magnet is circumferentially arranged on the core and is arranged in a magnetic barrier half-opening groove through a tangential magnetizing short permanent magnet, the tangential magnetizing long permanent magnet extends to the bottom of the magnetic barrier from the position of the magnetic barrier half-opening groove, the magnetic barrier is partially embedded in the magnetic barrier in the form, and a magnetic isolation bridge is arranged between two adjacent magnetic barriers. The invention reduces the leakage magnetic flux at the end of the permanent magnet and improves the effective magnetic flux utilization rate of the air gap and the torque density by carrying out shunt regulation and control on the leakage magnetic flux path, combines the high torque density and the low leakage magnetic flux, enhances the continuous output capability of the motor under the single-phase/multi-phase fault condition, and meets the driving scene with high reliability requirement.

Inventors

ZHOU HUAWEI
Wang Qicuan
JIANG GUANGYAO
TAO TAO
CHEN QIAN

Assignees

江苏大学

Dates

Publication Date: 20260505
Application Date: 20260211

Claims (10)

1. A double three-phase asymmetric Halbach array permanent magnet fault-tolerant motor is characterized by comprising a stator and a rotor; the stator comprises a stator core and double three-phase windings, wherein the stator core is formed by alternately arranging a plurality of armature teeth and fault-tolerant teeth or is only formed by arranging a plurality of armature teeth along the circumferential direction, the double three-phase windings are wound on the armature teeth, the double three-phase windings are concentrated windings, the rotor comprises a rotor core and an asymmetric Halbach array permanent magnet, a plurality of magnetic barriers are uniformly arranged on the outer circumference of the rotor core, each magnetic barrier is a half open slot, the inner width of each magnetic barrier is larger than the width of a slot opening of the magnetic barrier, the slot opening points to an air gap, a magnetic isolation bridge is arranged between the magnetic barriers, the asymmetric Halbach array permanent magnet consists of a short permanent magnet which is magnetized in the tangential direction, a permanent magnet which is magnetized in the radial direction, a long permanent magnet which is magnetized in the radial direction and a permanent magnet which is magnetized in the radial direction, and is distributed on the circumferential direction of the rotor core, wherein the short permanent magnet part which is magnetized is arranged in the opening slot of the magnetic barrier and fills the opening slot, the long permanent magnet part which is magnetized extends from the opening slot of the magnetic barrier to the bottom of the magnetic barrier, the opening slot is also filled with the opening slot, the permanent magnet which is magnetized in the radial direction or the radial direction and the inner side of the permanent magnet is equal to the width of the adjacent permanent magnet which is the radial direction and the slot opening width of the two permanent magnet cores which is the radial direction or the radial direction and the slot opening of the slot opening is formed by stacking the adjacent permanent magnet and the slot opening width between the magnetic cores.
2. The double three-phase asymmetric Halbach array permanent magnet fault-tolerant motor of claim 1, wherein the radial inward magnetizing permanent magnet and the radial outward magnetizing permanent magnet are surface mounted permanent magnets and are fixed on the surface of an iron core between half open slots of adjacent magnetic barriers through gluing or mechanical limiting structures, and the tangential magnetizing short permanent magnets and the tangential magnetizing long permanent magnets are embedded permanent magnets which are alternately arranged on two sides of the radial outward magnetizing permanent magnets.
3. The double three-phase asymmetric Halbach array permanent magnet fault tolerant motor of claim 1, wherein the radially inward magnetizing permanent magnets and the radially outward magnetizing permanent magnets are alternately arranged on the surface of the rotor along the circumferential direction, and the magnetizing directions of the tangentially magnetizing short permanent magnets and the tangentially magnetizing long permanent magnets are the tangentially directed radially outward magnetizing permanent magnets.
4. The permanent magnet fault-tolerant motor of the double three-phase asymmetric Halbach array, as set forth in claim 1, wherein the magnetic barrier is a half-open slot open toward an air gap side, the tangentially magnetized short permanent magnet is disposed at the half-open slot of the magnetic barrier and covers a half-open slot portion of the magnetic barrier in a radial direction, and the tangentially magnetized long permanent magnet extends from the half-open slot of the magnetic barrier to a bottom of the magnetic barrier and is partially embedded in the magnetic barrier.
5. The double three-phase asymmetric Halbach array permanent magnet fault tolerant motor of claim 1 wherein the asymmetric Halbach array permanent magnets are periodically and repeatedly arranged in the order of tangential magnetization short permanent magnets, radial inward magnetization permanent magnets, tangential magnetization long permanent magnets, radial outward magnetization permanent magnets or tangential magnetization long permanent magnets, radial inward magnetization permanent magnets, tangential magnetization short permanent magnets, radial outward magnetization permanent magnets along the circumferential direction of the rotor.
6. The double three-phase asymmetric Halbach array permanent magnet fault-tolerant motor of claim 1, wherein the radial length of the long tangential magnetizing permanent magnet is larger than that of the short tangential magnetizing permanent magnet, and the radial length ratio of the long tangential magnetizing permanent magnet to the short tangential magnetizing permanent magnet is (1.2-2): 1.
7. The double-three-phase asymmetric Halbach array permanent magnet fault-tolerant motor of claim 1, wherein the maximum lengths of the radially inward-magnetized permanent magnet, the radially outward-magnetized permanent magnet, the tangentially-magnetized short permanent magnet and the tangentially-magnetized long permanent magnet along the circumferential direction are tr 0= (0.25-0.5) = tau, tr 1= (0.25-0.5) = tau, tr 2= (0.2-0.35) = tau, tr 3= (0.2-0.35) = tau, tr0 is the circumferential maximum length of the radially inward-magnetized permanent magnet, tr1 is the circumferential maximum length of the radially outward-magnetized permanent magnet, tr2 is the circumferential maximum length of the tangentially-magnetized short permanent magnet, tr3 is the circumferential maximum length of the tangentially-magnetized long permanent magnet, and τ is the magnetic pole pitch.
8. The permanent magnet fault-tolerant motor of the double three-phase asymmetric Halbach array of claim 1, wherein the magnetic barrier is filled with a non-magnetic conductive material which is epoxy resin.
9. The permanent magnet fault-tolerant motor of a double three-phase asymmetric Halbach array according to claim 1, wherein the double three-phase windings are wound on the armature teeth, the winding phases are A1 and A2 phases, B1 and B2 phases and C1 and C2 phases, the phase difference between the A1 phase and the B1 phase is 120 DEG, the phase difference between the A1 phase and the A2 phase, the phase difference between the B1 phase and the B2 phase and the phase difference between the C1 phase and the C2 phase are 30 DEG, no winding is wound on the fault-tolerant teeth, and the fault-tolerant teeth and the armature teeth are alternately arranged.
10. The permanent magnet fault-tolerant motor of the double three-phase asymmetric Halbach array according to claim 1, wherein the motor is also composed of a stator based on three-phase fractional slot concentrated windings and a rotor composed of the asymmetric Halbach array permanent magnets and magnetic barriers.

Description

Double-three-phase asymmetric Halbach array permanent magnet fault-tolerant motor Technical Field The invention relates to a permanent magnet motor design technology, in particular to a double three-phase asymmetric Halbach array permanent magnet fault-tolerant motor. Background The permanent magnet motor has the advantages of compact structure, high torque density, high response speed and the like, and has good application prospects in the fields of electric automobiles, electromagnetic suspensions and the like. The electromagnetic suspension actuator has higher requirements on the continuity and reliability of actuating power output, and when a motor drive control system has local faults or a motor phase/multiphase winding has faults such as open circuit, short circuit and the like, the electromagnetic suspension actuator still needs to have certain torque continuous output capability so as to ensure the safety of the system. Therefore, the permanent magnet motor applied to the actuating mechanism needs to meet the requirement of high torque density and also has fault tolerance capability of good phase-to-phase isolation and sustainable output under faults. In addition, the rare earth permanent magnet material has higher price and limited resources, and has important engineering significance on how to improve the effective magnetic flux utilization rate of an air gap and reduce ineffective magnetic leakage while ensuring the performance. The existing permanent magnet fault-tolerant electricity generally reduces interphase coupling by adding phase number redundancy and matching with interphase fault-tolerant teeth and the like so as to improve the torque output capability when local faults occur to windings or drives. However, if there is significant pole leakage in the rotor-side magnetic circuit, the effective flux density utilization rate of the air gap is limited, and the output capability advantage due to the fault-tolerant structure is difficult to fully develop. In order to improve the air gap flux density, the prior art proposes to use a concentrated permanent magnet array (including a Halbach array) to concentrate more magnetic flux to the air gap side through the combination of permanent magnets with different magnetization directions so as to improve the torque density of the motor. Document "Multi-Objective Optimization Design and Analysis of Double-Layer Winding Halbach Fault-Tolerant Motor（IEEE Access, 2021）" proposes a Halbach fault-tolerant motor with double-layer windings, wherein although a Halbach magnetic gathering array is adopted on the rotor side of the motor, the structure mainly depends on the combination of the magnetization directions of permanent magnets to realize magnetism gathering, so that magnetic leakage still possibly forms a loop between adjacent magnetic poles, and the effective magnetic flux utilization rate of an air gap side is limited. On the other hand, document "Multiobjective Optimization Design of Unequal Halbach Array Permanent Magnet Vernier Motor Based on Optimization Algorithm (IEEE Transactions on Industry Applications, 2022)" proposes a permanent magnet motor of unequal Halbach segmented array, which reduces self-leakage between permanent magnets and improves the utilization rate of the permanent magnets by utilizing the configuration of auxiliary permanent magnets on two sides, but does not fully consider the end leakage of the permanent magnets. In summary, the existing permanent magnet fault-tolerant motor still has limited suppression of interelectrode magnetic flux leakage, and it is difficult to combine high magnetic flux concentration and low magnetic flux leakage in a compact size. Therefore, a rotor magnetic circuit structure which can cooperate with a Halbach array is needed, a graded reluctance channel is constructed on the rotor side, split-flow regulation and control are carried out on a leakage magnetic flux path by combining asymmetric permanent magnets and magnetic barrier arrangement, and meanwhile, the rotor magnetic circuit structure is matched with a multiphase fault-tolerant stator structure, so that leakage at the end part of the permanent magnets is further reduced, torque is improved, and continuous output capacity under a fault working condition is enhanced. Disclosure of Invention The invention aims to provide a double three-phase asymmetric Halbach array permanent magnet fault-tolerant motor, and provides a rotor magnetic circuit structure based on an air gap magnetic barrier and an asymmetric Halbach array permanent magnet, aiming at the problems that the end leakage of a permanent magnet is difficult to effectively inhibit and the effective magnetic flux utilization rate of an air gap is limited in the existing Halbach array permanent magnet fault-tolerant motor: the rotor magnetic barriers with openings facing the air gap side are arranged between the adjacent radial magnetizing permanent magnets, and meanwhile, tangential ma