Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Eliminating Method of Estimated Magnetic Flux Offset in Flux based Sensorless Control Algorithm of Surface Mounted PM Synchronous Motor
Authors Hack-Jun Kim ; Kwan-Yuhl Cho ; Hag-Wone Kim ; Kwang-Woon Lee
Page pp.216-222
ISSN 1229-2214
Keywords PM synchronous motor ; Sensorless ; Magnet flux estimator ; Rotor position estimator ; Offset
Abstract The rotor position of a PM synchronous motor is commonly estimated from the mathematical model for the sensorless control without rotor position sensors. For the magnet flux-based rotor position estimator in the stationary reference frame, the magnet flux estimator for estimating rotor position and speed includes the integrator. The integrator in the magnet flux estimator may accumulate the offset of the current sensors and the voltage drift. This continuous accumulation of the offset may cause the drift and overflow in the integrator, such that the estimated rotor position and speed may fail to track the real rotor position and speed. In this paper, the magnet flux estimator without integrator is proposed to avoid overflow in the integrator. The proposed rotor position and speed estimator based on magnet flux estimator are verified through simulation and experiment.