HF Pulsating Carrier Voltage Injection Method Based on Improved Position Error Signal Extraction Strategy for PMSM Position Sensorless Control

High-frequency (HF) pulsating carrier voltage injection method is widely used in position sensorless control of permanent magnet synchronous motor. In this method, the position error signal (i.e., amplitude of $q$-axis HF carrier current) is extracted by band-pass filter (BPF) and low-pass filter (LPF). However, with the BPF+LPF-based position error signal extraction strategy, position estimation ...