A study on IPMSM Design for Sensorless control with High-Frequency Voltage Signal Injection

Abstract

This paper proposes concept of motor for sensorlesscontrol and proper inductance distribution of InteriorPermanent Magnet Synchronous Motor (IPMSM) for sensorlessorienteddesign based on the high-frequency voltage signalinjection. There are two methods in the sensorless positioncontrol of IPMSM according to the operating speed. At low speedor standstill, rotor position is estimated from the inductancedistribution determined by saliency of the magnetic path. Androtor position can be estimated easier as this inductancedistribution is sinusoidal. However, in the motor design part, it isdifficult to make the sinusoidal inductance distribution becausethe inductance profile is distorted by means of core saturationwith input current under the load condition. In order to find asolution to this problem, it is established cause of the estimatingposition error, and concept of IPMSM for sensorless-orienteddesign is proposed. In this concept, as the Total HarmonicDistortion of the phase inductance in specific load condition isdecreased, the rotor position is better estimated. The inductancedistribution based on the high-frequency voltage signal injectionis compared with test results. Both simulation error patterns andexperiments are presented to verify the validity of the establishedmethod.