Speed Adaptative Sensorless Control Method of a High-speed Dual Three-phase Permanent Magnet Synchronous Motor

Abstract

This paper proposes a sensorless control method to improve the performance of a high-power, high-speed, and dual three-phase interior permanent magnet synchronous motor (PMSM). The motor has two sets of three-phase stator windings spatially phase shifted by 30 electrical degrees. First, a sliding-mode observer (SMO) is used to estimate the back EMF of the motor. Then the synchronous frequency tracking filter (SFTF) replaces the low-pass filter in the traditional sensorless control method, which can obtain the fundamental wave component in the back EMF. Finally, a phase-locked loop (PLL) is used to obtain the rotor position angle. An LC filter is also designed and adopted to reduce the current ripple due to the small inductance. In order not to generate additional losses, an active damper that also achieves the effect of suppressing resonance replaces the actual resistor.