Abstract
Frequency signal injection is commonly utilized in sensorless control of PMSM in low-speed operation. The HF square-wave injection technique eliminates the need for filters and enhances the system’s dynamic performance. Experiments have shown that when the motor is operating at a significantly low speed, the identification error caused by this method is too large, which often leads to the motor being difficult to start or out of control. In this paper, we provide an in-depth analysis of the HF-SWIM and suggest improvements to improve the response of the system and reduce the steady-state error of the identification. These improvements include refining the high-frequency separation formulation and improving the position observer. Simulations confirm the efficacy of the proposed method.
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