Influence of Load Characteristics on the Demagnetization of LSPMSM with Non-Uniform Air Gap Structure

doi:10.11985/2018.01.001

Abstract

Abstract:

Line-start permanent magnet synchronous motor (LSPMSM) with non-uniform air gap structure is proposed for reducing torque ripple, high electromagnetic noise caused by the complex harmonic distortion rate of air gap magnetic field of common LSPMSM. The demagnetization condition of the permanent magnet of the structure is different from that of the ordinary motor. In this paper, based on the principle that magnetic field vector in permanent magnet is almost the same, the magnetic flux density of the permanent magnet is characterized by the magnetic density of inner point of the magnet. Theoretical study and finite element simulation of line-start permanent magnet synchronous motor with non-uniform air gap structure are carried out. This article has analyzed the influence factors of the motor demagnetization, and relationship between load characteristic and demagnetization of permanent magnet has also been studied. In this paper, the variation law of permanent magnet working point during steady state operation and starting process is obtained, and research method of obtaining the minimum working point of permanent magnet is proposed.

Key words: Permanent magnet synchronous motor, permanent magnet demagnetization, moment of inertia, line-start

CLC Number:

TM351

Lei Chen,Changjiang Wu,Xiaohua Bao. Influence of Load Characteristics on the Demagnetization of LSPMSM with Non-Uniform Air Gap Structure[J]. Journal of Electrical Engineering, 2018, 13(1): 1-8.

Figures/Tables 16

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电磁参数名称	简称	数值
额定功率/kW	P_N	90
额定线电压/V	U_N	380
相数	m	3
极对数	p	2
不变气隙长度/mm	δ₀	1.5
偏心距/mm	t	3

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