Sensorless Indirect-Rotor-Field-Orientation Speed Control of a Permanent-Magnet Synchronous Motor With Stator-Resistance Estimation

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  2. Professor Paul Acarnley
Author(s)Rashed M, MacConnell PFA, Stronach AF, Acarnley P
Publication type Article
JournalIEEE Transactions on Industrial Electronics
ISSN (print)0278-0046
ISSN (electronic)1557-9948
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Efficient and precise sensorless speed control of Permanent Magnet Synchronous Motor PMSM requires accurate knowledge of rotor flux position and speed. In the literature, many sensorless schemes have been presented in which accurate estimation of rotor flux magnitude, position and speed is guaranteed by detecting the back-EMF. However, these schemes show great sensitivity to stator resistance mismatch and system noise especially at low speed operation. In the present paper, an indirect rotor flux oriented scheme for sensorless speed control of PMSM is proposed in which the rotor flux position is estimated by direct integration of the estimated rotor speed to reduce the effect of system noise. The stator resistance and the rotor flux speed and magnitude are estimated adaptively using stable Model Reference Adaptive System MRAS estimators. Simple stability analysis and design of the estimators are performed using linear control theory applied to an error model of the PMSM in a synchronous rotating reference frame. The convergence of rotor position and speed estimation errors to zero is guaranteed. Simulation and experimental results obtained show excellent performance.
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