Q-MRAS Based I-F Startup for Model Predictive Current Controlled Sensorless SPMSM Drive

초록

Back-EMF-based sensorless vector control for a permanent magnet synchronous motor (PMSM) requires an additional startup method because the position information cannot be properly extracted from the back-EMF at low-speed regions. A current-frequency (I-F) control is typically adopted as the startup strategy due to its simple structure and stable control. However, the performance of the conventional I-F control deteriorates when the deadbeat model predictive current control (MPCC) is used for current regulations. Also, the I-F control requires a significantly high current for stable operation, resulting in low efficiency. This paper proposes a model reference adaptive system (MRAS) based I-F control to achieve maximum torque per ampere (MTPA) control and provides an online motor parameter compensation for a smooth transition from I-F to sensorless vector control. As a result, the sensorless control can be effectively operated in the deadbeat model predictive current controlled surface-mounted PMSM (SPMSM) drives. Simulation and experimental results are provided to verify the performance of the proposed method.

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