在永磁同步电机(PMSM)数学模型和最大转矩电流比(MTPA)控制理论的基础上,分析了MTPA曲线的数学特性,表明MTPA曲线是等轴双曲线的左半支。根据该双曲线的特性,提出了一种线性分段MTPA近似控制算法。改变电机参数,计算MTPA真解与近似解之间的误差,验证该控制算法的可移植性。建立Simulink模型,进行仿真分析,对比查表法与MTPA近似控制算法的响应特性。仿真结果表明:线性分段MTPA近似控制算法具有良好的稳态和动态响应,可以较好地实现MTPA控制。

Based on the mathematical model of the permanent magnet synchronous motor (PMSM) and the maximum torque per ampere (MTPA) control method, the mathematical properties of the MTPA curve were analyzed. The MTPA curve was the left half of the equilateral hyperbola. According to the characteristics of this hyperbola, a piecewise linear MTPA approximate control algorithm was proposed. The portability of this control algorithm was proved by changing parameters of the motor and calculating errors between true value and approximate value. A Simulink model was established for simulation analysis. The response properties of lookup table method and piecewise linear algorithm were compared. The simulation results showed that the piecewise linear MTPA approximate control algorithm had good steadystate and dynamic response, and could well realize the MTPA control method.

TM 351