Abstract
This paper presents a novel control scheme for interior permanent magnet synchronous machine (IPMSM) to operate in wide speed range based on current angle approach. Below base speed, maximum torque per ampere (MTPA) strategy is employed and for above that, field weakening (FW) is utilized based on current angle. Motor can work continuously by choosing maximum angle between MTPA and FW strategies. Furthermore, it realizes maximum torque per flux (MTPF) strategy based on the torque angle control to operate above critical speed. The proposed algorithm could enter FW region (II) automatically. Compared to other methods, the algorithm of the proposed scheme is simple and d- and q-axis currents are generated separately. It is also capable of operating for both motoring and regenerating mode while achieving maximum torque. Besides, there is a smooth transition between constant torque and field weakening region in both modes. The simulation results show the validity of the proposed control scheme.
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