Position Sensorless Control of Long-Cable-Fed PMSM Drive System Using Sine-wave Filter

Long-cable-fed motor drives have been widely used in industrial and commercial fields. However, the overvoltages caused by the reflected wave phenomenon at the motor terminal can lead to a premature failure of the motor winding insultation. This paper proposed position sensorless control of long-cable-fed PMSM drives considering the practical installation environments. The proposed method can make better position estimation performance due to taking account of parameter variations of the motor caused by the temperature, the voltage drop from the resistive component of the cable and the motor-side voltage and current estimations using the inverter-side information. The experimental results with 100 m length of the cable show that the proposed sensorless strategy can significantly improve the position estimation performance.