单相永磁无刷直流电机启动及运行分析

Starting and Running Analysis of Single Phase Permanent Magnet Brushless DC motor

单相永磁直流无刷电机,虽然兼具交流电机低成本和多相直流电机高效率的优点,但因单相永磁直流无刷电机定子只有1相绕组,采用常规的方法电机不能启动,同时电机运行时存在转矩脉动大等问题,使其应用受到限制。为了解决这些问题,本文从单相永磁直流电机的原理出发,利用Ansoft有限元分析,通过案例分析,得到了用定转子不同心的结构来解决单相永磁直流无刷电机启动的方法,以及通过适时调整电流与反电动势相位关系,能提高电机启动和电机运行性能的结论。

Although the single-phase permanent magnet brushless DC motor has advantages of low cost and high efficiency,its stator has only 1 phase winding which can’t adopt the conventional method to start,and at the same time the problem of large torque ripple occurred when the motor is running makes limited application.In order to solve these problems,we obtained the method to start the single-phase permanent magnet brushless DC motor by stator structure in different hearts starting from the principles of single-phase permanent magnet brushless DC motor,using Ansoft finite element analysis and cases analysis,and through adjusting current and back EMF phase relationship timely,it can improve the motor starting and running performance.