Flux-linkage Characterization and Rotor Position Estimation of Switched Reluctance Motor using Bézier Curves

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Abstract
The control of switched reluctance motor drives requires an accurate knowledge of its flux-linkage characteristics and the rotor position. This paper presents a method for modelling the flux-linkage characteristics of a switched reluctance motor (SRM) using parametric Bézier curves. The presented model requires fewer coefficients to be stored as compared to the conventional look-up table based method. The derived model is then used to estimate the rotor position to develop a sensorless drive. The model is validated by comparing the calculated flux-linkage with the experimentally obtained flux-linkage characteristics of the motor and the actual and the estimated rotor position by simulating the model in MATLAB/Simulink environment.

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