磁通切换永磁电机等效模型与控制策略分析

Equivalent model and control strategies analysis for flux-switching permanent-magnet motor

针对传统转子永磁型电机散热困难导致永磁体发生不可逆退磁、限制电机出力、减少功率密度等问题,提出了一种定子永磁型磁通切换永磁(FSPM)电机,并对该电机结构特点与等效模型进行了分析,比较了定子磁场定向控制(SFOC)、直接转矩控制(DTC)及基于空间矢量调制的直接转矩控制(SVM-DTC)三种控制方法在FSPM电机上的应用效果。运用dSPACE的实验平台,对基于SFOC的FSPM电机驱动系统进行了实验研究。仿真与实验结果表明,采用SFOC的FSPM电机转矩脉动小、电流正弦度好以及低速性能优越,更适合于低速驱动领域的应用。

Traditional rotor-permanent magnet （PM） motor cooling problems lead to irreversible PM demagnetization limiting the electrical output capacity, reducing the power density and so on. A new statorpermanent magnet flux-switching PM （FSPM） is put forward. Its configuration and equivalent mathematic model are analyzed, and three control strategies, namely stator flux-orientation control （SFOC）, direct torque control （DTC） and space vector modulation DTC （SVM-DTC）, are compared for a FSPM motor on application effects, respectively. Furthermore, the SFOC system is implemented in a real-time dSPACE control platform for the experimental test of a prototyped FSPM motor drive. The simulated and experimental results indicate that the SFOC method has prior performances including the sinusoidal phase current and low torque and speed pulsations, which is suitable for the request of low speed operation.