| Title |
The P/PI Mode Switching Method of Gopinath Flux Observer for Sensorless Vector Control of Induction Motors |
| Authors |
강명규(Kang, Myeong-Kyu) ; 최종우(Choi, Jong-Woo) |
| DOI |
https://doi.org/10.5370/KIEE.2017.66.12.1732 |
| Keywords |
Gopinath flux observer ; Induction motor ; Vector control ; Sensorless Control |
| Abstract |
This paper presents a sensorless vector control algorithm of closed loop Gopinath flux observer to enhance the robustness at low speed by switching P/PI mode. Closed loop Gopinath flux observer has the problem in sensorless vector control of induction motor at low speed. This paper solves the problem using the characteristic function of closed loop Gopinath flux observer. P mode shows better performance than PI mode under the cut-off frequency of observer. But P mode always has a flux error due to DC offset, so this paper combines P mode and PI mode. This algorithm shows good performance over wide speed range. The performance has been confirmed through computer simulations using MATLAB SIMULINK and experiments. |