TY - GEN

T1 - A sensorless sliding mode observer with improper speed input using an alternative state-space model of the induction motor

AU - Comanescu, Mihai

PY - 2014/1/1

Y1 - 2014/1/1

N2 - The paper discusses the problem of flux estimation for the induction motor (IM) drive and presents a sensorless observer. The objective is to estimate the fluxes of the IM in the stationary reference frame and to obtain the magnitude and the angle of the rotor flux. In a typical sensorless IM scheme, both these estimates are needed. The paper first presents an alternative state-space model of the IM. Using this, a Sliding Mode (SM) observer is designed. The paper first assumes that the speed of the motor is measured and develops a sensored observer; this is later transformed into a sensorless observer by feeding it with a speed estimate. This approach eliminates the need to measure the speed; instead, the speed estimate is an input of the SM observer. The paper studies the behavior of the observer under these conditions, finds a favorable tuning and shows that the resulting estimates are quite insensitive to the speed mismatch. The proposed design allows accurate estimation of the magnitude and angle of the flux. Previous observers developed under the same conditions based on the traditional IM model were capable of estimating only the angle of the flux (but not the magnitude). The advantage of this method is that it also yields an accurate flux magnitude. The equilibrium point of the observer with improper speed input is studied and conclusions are drawn. The theoretical developments and observations are supported by the simulations.

AB - The paper discusses the problem of flux estimation for the induction motor (IM) drive and presents a sensorless observer. The objective is to estimate the fluxes of the IM in the stationary reference frame and to obtain the magnitude and the angle of the rotor flux. In a typical sensorless IM scheme, both these estimates are needed. The paper first presents an alternative state-space model of the IM. Using this, a Sliding Mode (SM) observer is designed. The paper first assumes that the speed of the motor is measured and develops a sensored observer; this is later transformed into a sensorless observer by feeding it with a speed estimate. This approach eliminates the need to measure the speed; instead, the speed estimate is an input of the SM observer. The paper studies the behavior of the observer under these conditions, finds a favorable tuning and shows that the resulting estimates are quite insensitive to the speed mismatch. The proposed design allows accurate estimation of the magnitude and angle of the flux. Previous observers developed under the same conditions based on the traditional IM model were capable of estimating only the angle of the flux (but not the magnitude). The advantage of this method is that it also yields an accurate flux magnitude. The equilibrium point of the observer with improper speed input is studied and conclusions are drawn. The theoretical developments and observations are supported by the simulations.

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U2 - 10.1109/SPEEDAM.2014.6871914

DO - 10.1109/SPEEDAM.2014.6871914

M3 - Conference contribution

AN - SCOPUS:84906693617

SN - 9781479947492

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

SP - 483

EP - 488

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 -