Enhanced Sensorless Position Estimation for Dual Three-Phase PMSM via Terminal Voltage Detection-Based High-Frequency Injection

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In this article, a novel high-frequency pulsating square-wave injection (HFPSI) strategy utilizing terminal voltage is proposed for sensorless control of dual three-phase permanent magnet synchronous motors (DTP-PMSMs) has been proposed. Different from the conventional HFI methods with carrier current sensing, the proposed strategy utilizes the voltage induced by mutual inductance between two sets of windings as a carrier for positional information. Compared to traditional methods, the proposed approach effectively enhances the high-frequency (HF) components containing rotor position information, which facilitates the extraction and demodulation of HF voltage, thereby significantly improving sensorless control performance. At the same time, acoustic noise can be attenuated by reducing the amplitude of the injection voltage. Besides, a switching strategy for this method has been presented in conjunction with a high-speed sensorless approach to ensure that the DTP-PMSM can achieve sensorless control across the entire speed range. This approach mitigates the influence of the sampling noise, thereby enhancing position accuracy. Finally, the validity of the proposed HFPSI strategy is experimentally confirmed.

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