Title :
Walsh function based position sensorless drive of salient pole PM motor
Author :
Kobayashi, Naoto ; Choeisai, Krit ; Kondo, Seiji
Author_Institution :
Nagaoka Univ. of Technol., Niigata, Japan
Abstract :
In this paper a novel position sensorless drive method for a salient pole PM motor is proposed based on the Walsh function. The Walsh harmonic component of ripple-current generated by PWM inverter with 20 kHz makes it possible to estimate rotor direction. However, the magnetic pole (N or S) cannot be identified through magnetic saliency. In the proposed scheme, magnetic saturation is used to identify the magnetic pole, which causes armature current distortion. The proposed circuit detects a second order harmonic component of distorted current, with separating the small ripple-current from the motor drive current. The proposed method was verified by several experimental results
Keywords :
PWM invertors; Walsh functions; harmonics; permanent magnet motors; synchronous motor drives; PWM inverter; Walsh function; Walsh harmonic component; armature current distortion; distorted current; magnetic pole; magnetic saliency; magnetic saturation; motor drive current; position sensorless drive method; ripple-current; rotor direction estimation; salient pole PM motor; second order harmonic component; small ripple-current; Circuits; Detectors; Frequency; Inductance; Magnetic separation; Power harmonic filters; Pulse width modulation inverters; Rotors; Saturation magnetization; Voltage;
Conference_Titel :
Power Conversion Conference, 2002. PCC-Osaka 2002. Proceedings of the
Conference_Location :
Osaka
Print_ISBN :
0-7803-7156-9
DOI :
10.1109/PCC.2002.998559
