Improvement of speed sensorless control method of induction motors

Author

Liu, Congwei ; Li, Chongjian ; Wei, Lixiang ; Li, Fahai

Author_Institution

Dept. of Electr. Eng., Tsinghua Univ., Beijing, China

Volume

2

fYear

1998

fDate

31 Aug-4 Sep 1998

Firstpage

986

Abstract

This paper presents a novel method to improve the performance of speed sensorless vector control system. This method is based on the conventional method that uses feedback of q-axis flux to obtain estimated speed. To improve the dynamic performance of speed estimation, the feedforward item of estimated speed is added. Because q-axis rotor flux is controlled nearly to zero in this method, the equation for feedforward speed calculation can be obtained easily and exactly. Compared with former method, this new method has better dynamic characteristics. The effectiveness is verified by digital simulation

Keywords

control system analysis computing; control system synthesis; electric machine analysis computing; feedback; feedforward; induction motors; machine theory; machine vector control; parameter estimation; rotors; velocity control; computer simulation; control design; control performance improvement; control simulation; dynamic characteristics; feedforward speed calculation; induction motors; q-axis rotor flux feedback; speed estimation; speed sensorless control method; vector control system; Equations; Frequency estimation; Induction motors; Machine vector control; Rotors; Sensor systems; Sensorless control; Torque control; Velocity control; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics Society, 1998. IECON '98. Proceedings of the 24th Annual Conference of the IEEE

Conference_Location

Aachen

Print_ISBN

0-7803-4503-7

Type

conf

DOI

10.1109/IECON.1998.724228

Filename

724228