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This paper proposes a six-step operation strategy for the direct self-control (DSC) method of an interior permanent magnet synchronous motor

(IPMSM) based on the torque angle. Conventional DSC methods for induction motors (IMs) have been studied for railway applications as these

methods are suitable for controlling high-power traction drives and extending the voltage utilization through a six-step inverter operation. However,

the IPMSMs controlled via conventional DSC methods for IMs cannot be properly controlled through a six-step operation as torque angle is not

considered. Additionally, synchronous frame rotation causes a phase error at high speeds owing to the time delay of digital controller. This paper

presents a torque angle compensation, whereby the dynamic performance is improved. The effectiveness of the proposed DSC method was verified

through experimental results.