关键词: 感应电机, 改进转子磁链观测器, 无速度传感器, 误差校正项, 滑差迭代更新, 矢量控制

Abstract:

In the speed sensorless vector control system of induction machine, accurate flux and speed information is very important. On the basis of the traditional voltage model,an improved rotor flux observer with the programmable low-pass filter (LPF) was studied.LPF was used instead of an integrator to avoid the influence of initial integral value,integral saturation and DC drift problems.The rotor flux observed by the low-pass filter was compensated by the reference value of the rotor flux.At the same time,the filtering stage and error correction term of synchronous angular frequency were introduced to estimate the rotor angular frequency and synchronous angular frequency by slip iteration update. The influence of random interference and measurement noise was effectively eliminated, and the accuracy of estimated speed and synchronization position angle was ensured.The improved flux observer and speed estimation scheme were used in the rotor flux oriented vector control system,and the feasibility of the scheme was verified on the DSP experimental platform.

Key words: induction motor, improved rotor flux observer, speed sensorless, error correction term, slip iteration update, vector control