Title :
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
fDate :
31 Aug-4 Sep 1998
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;
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
DOI :
10.1109/IECON.1998.724228
