Improved Pulsating Signal Injection Sensorless Control of Dual Three-Phase IPMSMs With Arbitrary Inductance Asymmetries in One Set Three-Phase Windings

This paper investigates the influence of arbitrary self-inductance asymmetries in one set three-phase windings on high-frequency pulsating sinusoidal signal injection based sensorless control of dual three-phase interior permanent magnet synchronous machine and the adaptive notch filter is utilized to compensate arbitrary inductance asymmetries. It is found that the demodulated current responses in both two sets generate 2nd- and 4th-order positive and negative sequence error signals because of arbitrary self-inductance asymmetries in one set three-phase windings. These current error signals cause 2nd- and 4th-order estimated position errors in high frequency pulsating sinusoidal signal injection-based sensorless control method. The adaptive notch filter based compensation method can suppress both 2nd- and 4th-order estimated position errors. The compensation method for inductance asymmetries is validated by the measured results.