Sensorless control interior permanent-magnet synchronous motor drive over wide speed range operation based on the current derivative method

This paper presents a sensorless control method for IPMSMS drives over a wide speed range operation, including zero speed. The rotor position estimation of this method is based on relating the measured current derivative response which excited from fundamental PWM sequences to the incremental inductance. Compared to other saliency tracking sensorless control schemes, this method doesn't require additional injected signals or test vectors. The experimental results are shown to verify the effectiveness of this sensorless control for IPMSM.