Aiming at the problem of poor dynamic and low steady-state accuracy of sensorless control for permanent magnet synchronous machine(PMSM) in low speed range, a voltage pulse injection on αβ axis based position estimation strategy is proposed. During 4 consecutive pulse width modulation(PWM) periods, 4 symmetrically voltage pulses are injected, and phase currents are sampled by current oversampling method. What is more, a compensation method is adopted to reduce the nonlinear impacts of the inverter. The prop...
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