异步起动永磁同步电动机起动过程中永磁体退磁研究

发布时间：2018-03-23 01:17

本文选题：异步起动永磁同步电动机　切入点：退磁　出处：《中国电机工程学报》2015年04期 　论文类型：期刊论文

【摘要】：异步起动永磁同步电动机起动过程中,定转子电流产生的强退磁磁场可能导致永磁体发生不可逆退磁。该文采用二维有限元法,深入研究了W形转子结构异步起动永磁同步电动机起动过程中永磁体的退磁特点,分析了定转子基波磁动势对永磁体工作点的影响,以及永磁体最大退磁点出现的规律。结果表明:电机以不同负载条件及转子初始位置起动时,每个起动过程中永磁体退磁最明显的时刻可能出现在任意转速;随着负载转矩和转动惯量的增大,永磁体退磁最明显时刻的电机转速接近同步速的概率增大,永磁体遇到最严重退磁磁场的概率也将增大。电机正常起动过程中,很可能在永磁体边角位置发生不可逆退磁,位置比较固定且区域面积很小,不会对电机性能产生显著的影响。
[Abstract]:In the starting process of asynchronous starting permanent magnet synchronous motor (PMSM), the strong demagnetization field produced by stator and rotor current may lead to irreversible demagnetization of permanent magnet. In this paper, the demagnetization characteristics of permanent magnet in the starting process of asynchronous starting permanent magnet synchronous motor with W-shaped rotor structure are studied, and the influence of stator and rotor fundamental wave magnetic EMF on the working point of permanent magnet is analyzed. The results show that the most obvious demagnetization moment of permanent magnet in each starting process may occur at any speed when the motor starts at different load conditions and rotor initial position. With the increase of load torque and moment of inertia, the probability of motor speed approaching synchronous speed at the most obvious moment of demagnetization of permanent magnet increases, and the probability of permanent magnet encountering the most serious demagnetizing magnetic field also increases. It is very likely that irreversible demagnetization occurs in the corner position of the permanent magnet and the position is relatively fixed and the area is very small which will not have a significant effect on the performance of the motor.
【作者单位】：山东大学电气工程学院;中石化胜利油田技术检测中心;
【基金】：国家自然科学基金项目(51177089) 高等学校博士学科点专项科研基金资助项目(20110131110010)~~
【分类号】：TM341

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