永磁同步电机转矩角闭环控制策略研究

Control Strategy for PMSM with Angle β Closed-loop Control

车用内嵌式永磁同步电机运行性能受到电机参数及控制器输出能力的限制。为了提高永磁同步电机单位电流输出转矩的能力以及对电机参数的鲁棒性,该文提出了一种转矩角闭环的最大转矩电流比控制策略。该策略通过永磁同步电机的数学模型推导出在同步dq轴系下以定子电压、电流为变量的电磁转矩方程,并以此为依据构建出满足最大转矩电流比的转矩角β的闭环控制系统,摆脱了永磁同步电机最大转矩电流比控制对电机参数的依赖,提高了控制准确性。仿真和实验结果验证了所提控制策略的可行性和有效性。

The performance of electric vehicles （EV） control system is affected by the parameters of the interior permanent magnet synchronous motor （IPMSM） and the output voltage and current limits of the controller. In order to improve the system robustness to the parameters and the maximum torque per ampere （MTPA） of the controller, a method with angleβ closed-loop control was proposed to automatically track the maximum torque. On the basis of mathematical model of permanent magnet synchronous motor, electromagnetic torque equation was calculated by the variables of stator voltage and current on the synchronous dq axis, and a torque control angleβ closed-loop control system for automatically tracking the maximum torque was established, which disengaged from the dependence on the parameters of the IPMSM. Simulation and experimental results demonstrate that the control strategy is feasible and effective.