A control system that couples the maximum torque current ratio(MTPA)technique and the field weakening control technique was developed for built-in permanent magnet motors widely used in hybrid electric vehicles.The control system aims to increase the reluctance torque utilization efficiency and the control efficiency,meanwhile reducing the current required by the motor.Using the base speed as the criterion,the MTPA vector control strategy is adopted when the vehicle velocity goes below the base speed to satisfy high torque demands at low RPM and improve the range of the vehicle.When the vehicle velocity exceeds the base speed,the control switch to the field weakening control mode judging by the DC side voltage utilization rate.Furthermore,by introducing feedback decoupling,the adverse effects caused by coupling items at high speeds are reduced.Simulation and experimental results show that the control strategy has high control precision and fast dynamic response,and is suitable for the permanent magnet motor control system of hybrid electric vehicles.
关键词
永磁同步电机/Id=0控制/MTPA控制/弱磁控制/反馈解耦
Key words
permanent magnet synchronous motor/Id=0 control/MTPA control/field weakening control/current decoupling control
维普
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