电动汽车IPMSM单电流调节器弱磁控制技术

针对电动汽车IPMSM在弱磁扩速时交直轴电流强耦合的问题,采用单电流调节器的弱磁控制方式,通过选择开关对最大转矩电流比(MTPA)控制方式和弱磁控制方式在不同运行状态下进行切换。在弱磁控制中直轴电压指令由直轴电流调节器获得,交轴电压指令则根据直轴电压值通过调节器直接给出。该方法能够对电机直流电压充分利用,使电机工作在最优工作点。建立该控制系统的Matlab/Simulink仿真模型,仿真结果分析证明该方法的可行性。最后搭建以英飞凌TC 1782为主控芯片的电动汽车驱动控制系统平台,对所提的控制策略的实际应用能力进行验证。

Flux-Weakening Control Based on Single Current Rregulator for IPMSM of Electric Vehicle

For flux-weakening control of electric vehicles, this paper adopts a method of single current regulator to solve the strong coupling problem between d-axis and q-axis. This method utilizes switching between MTPA and flux-weakening control in different operation state. In flux-weakening operation, the d-axis voltage is gotten by d-axis voltage regulator. While the q-axis voltage is gotten by a regulator directly. The new flux-weakening control strategy can fully utilize the DC voltage and make the motor working at the optimal operating point. To verify the feasibility of the control strategy, a Matlab/Simulink modeling is established. Finally, Infineon TC1782 as the main control chip is used to build the drive system platform of electric vehicle to test the actual application ability of the proposed control strategy.