Torque Control of PMSM in Flux-Weakening Region Based on Cascaded-Loop Voltage Angle Control

초록

In flux-weakening control, maximizing voltage utilization is crucial for achieving higher output torque and motor speed. Conventional direct voltage angle control methods maximize voltage utilization but often ignore current dynamics, leading to severe current oscillations and instability. This paper proposes an improved voltage angle control method for the torque control of a PMSM to maximize voltage utilization in the flux-weakening region while maintaining stable current control. The proposed method operates as a single-variable controller within an SFOC framework, utilizing solely the voltage angle to regulate motor torque via the q-axis current. Unlike conventional approaches, this method adopts an inner flux control loop, resulting in more stable current control without oscillations. Furthermore, a systematic gain tuning process and a comprehensive stability analysis of the cascaded control structure are conducted. The performance of the proposed controller is verified through simulations and experimental results. © 2026 IEEJ-IAS.

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