摘要
考虑到稀土永磁同步电动机电枢电阻及电机的凸极效应，根据电机矢量图推出了其基本方程，通过控制特性分析，提出了最小电流法并采用Ｕ／ｆ，曲线自学习实现了恒转矩控制时任意频率下的最佳效率调速，给出了实际电路以及该方法的优越性。
In China, the open-loop variable-frequency adjusting speed technique has been successfully used to control REPMSM (rare earth permanent magnetic synchronous motor),but in this system there are still two weaknesses: (1) the motor efficiency is not the haghest possible ; (2) the voltage-frequency control curve is not quite satisfactory. With a view to reducing these two weaknesses, we consider the influences of the armature resistance and the salient pole effect which were tenored in the past.First we derive REPMSM fundamental equations (eqs. 4 through 12) from the vector diagram (Fig. lb); then draw its V-shaped control characteristic curve in Fig. 2. Analysis shows that REPMSM current is not minimum at cos=1. Therefore, from the viewpoint of reducing the copper loss and the demagnetizing effect of the armature reaction, we conclude that the control of REPMSM should adopt minimum current control to obtain optimal efficiency. The single-chip microcomputer is used to seek the minimum current in a certain steady frequency; it can also, through self-learning, satisfy the fine coordination of the controller and REPMSM, thus making the voltage-frequency curve a little moresatisfactory.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
1996年第3期401-405,共5页
Journal of Northwestern Polytechnical University
基金
国家"八五"攻关资助
