关键词: 永磁同步电动机, MTPA 控制, 虚拟正弦信号注入, 交叉耦合效应, 电感辨识

Abstract: The existing maximum torque per ampere ( MTPA ) control method on account of virtual sine signal injection ( VSSI) takes the ideal permanent magnet synchronous machine mathematical model as the theoretical basis and does not consider the adverse effects brought by inductance changes. To enhance the control effect of MTPA, the magnetic circuit cross-coupling effect was taken into account, and an online inductance identification method and an improved MTPA control method are proposed. The inductance identification method based on Pader approximation and variable step-size neural network can not only solve the rank deficiency problem of the identification model, but also update the changing inductance parameters online. Combined with the improved MTPA control based on VSSI, it can effectively reduce the current vector angle error, decrease the stator copper loss, and achieve more accurate MTPA control. The accuracy of the proposed method is verified through simulation experiments.

Key words: permanent magnet synchronous machine, maximum torque per ampere control, virtual sine signal injection, cross-coupling effect, inductance identification