Review of Position Estimation Methods for Permanent Magnet Synchronous Motors

This paper presents a review regarding the techniques used for estimation of position and speed of sensorless permanent magnet synchronous motor drives .Permanent-magnet synchronous machines (PMSMs) are widely used in industrial applications due to their distinctive advantages, such as high efficiency, high power density, and wide constant power region. Most of the times, accurate rotor position information is measured by rotary encoders or resolvers to achieve high-performance field oriented control. However, the use of these sensors increases the cost, size, weight, and wiring complexity and reduces the mechanical robustness and the reliability of the overall PMSM drive systems. Hence sensoreless methods have gained much attention. In this Paper Sensoreless Control Methods including Indirect Methods based on magnitude of back EMF, some model based methods like Flux linkage based estimation, Non-linear observers and extended kalman filter and high frequency signal injection based methods are described. Keywords: back EMF, estimators, high frequency signal injection, PMSM, Sensoreless.

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