负载特性对不均匀气隙结构异步起动永磁同步电机退磁的影响

doi:10.11985/2018.01.001

摘要/Abstract

摘要：

不均匀气隙结构的异步起动永磁体同步电机是针对普通异步起动永磁同步电机由于气隙磁场谐波复杂而导致的运行过程中转矩脉动大、电磁噪声高等问题提出的,此结构电机的永磁体退磁情况与普通电机有较大不同。本文基于永磁体内各处的磁场矢量基本相同的原则,利用永磁体内部一点的磁密表征整个永磁体在运行过程中磁密的变化,对不均匀气隙结构异步起动永磁体同步电机永磁体工作点展开了理论研究与有限元仿真。分析了影响电机退磁的因素,研究了施加不同负载与转动惯量时永磁体的磁密变化情况,得到电机稳态运行时和起动过程中永磁体工作点的变化规律,提出了获得永磁体磁密最小工作点的研究方法。

关键词: 永磁同步电机, 永磁体退磁, 转动惯量, 异步起动

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

中图分类号:

TM351

陈垒,吴长江,鲍晓华. 负载特性对不均匀气隙结构异步起动永磁同步电机退磁的影响[J]. 电气工程学报, 2018, 13(1): 1-8.

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.

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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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