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Title:
LOSS ANALYSIS AND SUPPRESSION METHOD FOR MAGNETIC FIELD-MODULATED PERMANENT-MAGNET ELECTRIC MOTOR
Document Type and Number:
WIPO Patent Application WO/2022/110274
Kind Code:
A1
Abstract:
A loss analysis and suppression method for a magnetic field-modulated permanent-magnet electric motor. A magnetomotive force and magnetic conduction model is established according to the structures of a stator (1), a rotor (2), permanent magnets (21) and armature windings (3) of a magnetic field-modulated permanent-magnet electric motor, and air-gap magnetic field harmonic distributions of the armature windings (3) and the permanent magnets are derived; the order, frequency and rotation characteristics of a magnetic field harmonic wave are analyzed, and whether each order of magnetic field harmonic wave can contribute to a torque and a loss; and contribution values of each order of magnetic field harmonic wave to the torque and the loss are calculated, and a high-hazard magnetic field harmonic wave which generates the loss but does not generate the torque is measured. A rotor magnetic flux barrier structure is designed, the adjustment effect of a magnetic flux barrier on a magnetic field harmonic wave is analyzed, the magnetic resistance on a magnetic flux path where the armature windings (3) generate high-hazard magnetic field harmonic waves is increased, and magnetic field harmonic components of high-hazard armature windings (3) are reduced in a targeted manner without affecting a magnetic field harmonic component that generates the torque. By means of the method, a high-hazard magnetic field harmonic wave can be directionally suppressed, thereby achieving a loss suppression effect on the premise of guaranteeing a high torque density of an electric motor.

Inventors:
XU LIANG (CN)
ZHAO WENXIANG (CN)
JIANG TINGTING (CN)
LIU GUOHAI (CN)
Application Number:
PCT/CN2020/133832
Publication Date:
June 02, 2022
Filing Date:
December 04, 2020
Export Citation:
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Assignee:
UNIV JIANGSU (CN)
International Classes:
H02K21/02
Foreign References:
CN111525713A2020-08-11
CN104319969A2015-01-28
CN109617267A2019-04-12
CN111509941A2020-08-07
JP2008301652A2008-12-11
Other References:
WU, MENGMENG: "Harmonic Analysis and Low Loss Design of FSCWs PM Motors Based on Magnetic Field Modulation", CHINESE MASTER'S THESES FULL-TEXT DATABASE, ENGINEERING SCIENCE & TECHNOLOGY, no. 11, 1 April 2019 (2019-04-01), pages 1 - 85, XP055934148, ISSN: 1674-0246
JI, JINGHUA ET AL.: "Operation Principle Analysis of Air-gap Magnetic Field Modulation in Five-phase Fault-tolerant Flux-switching Permanent-magnet Motor", PROCEEDINGS OF THE CSEE, vol. 37, no. 21, 5 November 2017 (2017-11-05), pages 6227 - 6236, XP055934159, ISSN: 0258-8013
Attorney, Agent or Firm:
NANJING IPZHI INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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