A Comparative Study of Position Sensorless Low Speed Start Methods in Surface Mounted Permanent Magnet Synchronous Motor
Due to the fact that most sensorless control methods for permanent magnet synchronous motors operating at medium-high speeds use back electromotive force to estimate angle position and speed,this is often not applicable at low speeds.In order to realize the low speed start of the sensorless control for PMSM and switch to medium high speed,analyzed three low speed start control methods constant volts/hertz,keep-ing constant ratio of current and frequency,pulse high frequency voltage signal injection.Open loop control based on new V/F curve and voltage compensation,approximate compensation pressure drop of stator im-pedance to prevent start fail.One close loop keeping constant ratio of current and frequency control and double close loop pulse high frequency voltage signal injection control introduces weighting algorithm to switch to sliding model observer.Finally,a simulation model for sensorless control system of a PMSM was established and the simulation was established by using Matlab/Simulink.Furthermore,the simulation re-sults corroborate the efficacy of the proposed method.
permanent magnet synchronous motorslow speed startweighted methodsensorless control
万方数据
维普
