TY - GEN

T1 - An MRAS-type estimator for the speed, flux magnitude and rotor flux angle of the induction motor using sliding mode

AU - Comanescu, Mihai

PY - 2014/1/1

Y1 - 2014/1/1

N2 - The paper discusses the problem of estimating the speed, the flux magnitude and the rotor flux angle of the induction motor (IM) and presents an estimation method based on two Sliding Mode Observers (SMOs) and the Model Reference Adaptive System (MRAS) technique. The method is based on implementation of two SMOs that both yield the magnitude of the rotor flux; one observer is the reference model, the other is the adjustable model. The MRAS method is used to adapt the speed signal which is an input into both SMOs. The reference model is designed using the equations of the IM in the rotating reference frame. It is shown that its estimated flux magnitude is insensitive to the input speed. The adjustable model uses the IM equations in the stationary reference frame. Its output fluxes have magnitudes inverse proportional with the input speed; however, their phases are always accurate (this allows estimation of the flux angle). Using MRAS, the speed is corrected such that the flux magnitudes coming out of the two models match. Based on the structure developed, the paper also a speed estimation method. The simulations validate the theoretical development.

AB - The paper discusses the problem of estimating the speed, the flux magnitude and the rotor flux angle of the induction motor (IM) and presents an estimation method based on two Sliding Mode Observers (SMOs) and the Model Reference Adaptive System (MRAS) technique. The method is based on implementation of two SMOs that both yield the magnitude of the rotor flux; one observer is the reference model, the other is the adjustable model. The MRAS method is used to adapt the speed signal which is an input into both SMOs. The reference model is designed using the equations of the IM in the rotating reference frame. It is shown that its estimated flux magnitude is insensitive to the input speed. The adjustable model uses the IM equations in the stationary reference frame. Its output fluxes have magnitudes inverse proportional with the input speed; however, their phases are always accurate (this allows estimation of the flux angle). Using MRAS, the speed is corrected such that the flux magnitudes coming out of the two models match. Based on the structure developed, the paper also a speed estimation method. The simulations validate the theoretical development.

UR - http://www.scopus.com/inward/record.url?scp=84906671680&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84906671680&partnerID=8YFLogxK

U2 - 10.1109/SPEEDAM.2014.6871913

DO - 10.1109/SPEEDAM.2014.6871913

M3 - Conference contribution

AN - SCOPUS:84906671680

SN - 9781479947492

T3 - 2014 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2014

SP - 719

EP - 724

BT - 2014 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2014

PB - IEEE Computer Society

T2 - 2014 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2014

Y2 - 18 June 2014 through 20 June 2014

ER -