A robust field-weakening control strategy for IPMSM drives

In this paper, a robust field-weakening control strategy for IPMSM drives is proposed to achieve fast response and minimum copper loss. First, the classification of three operation regions for positive speed operation is adopted. It is seen that current limit and voltage limit will affect the maximum torque capability and minimum copper loss operation. Second, in order to achieve minimum copper loss as well as fast response, the proposed robust controller adjust the d-axis current command and the upper bounds of the maximum q-axis current of the speed controller through an integral controller of the error between the maximum inverter output voltage and the output voltage command resulting from the current controllers. Finally a DSP-based prototype drive is constructed and some experimental results are given to verify the validity of the proposed strategy.