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In this paper, new methods for reducing the torque ripple in permanent magnet synchronous motor are proposed. The methods are based on injection of appropriate current harmonics to motor by using adaptive decision fusion algorithms. Three different methods are used in determining injection of current harmonics based on q‐axis current, q‐axis voltage and reference value of the q‐axis current. In these methods, the decision values are linearly combined with weights, which are updated online according to an active fusion method, based on performing orthogonal projections onto convex sets describing these values. The validity of the proposed methods is tested with experimental studies under different operating conditions. [ABSTRACT FROM AUTHOR]

Back emf methods have been widely used in position and speed sensorless control of permanent magnet synchronous motors. In this method, it is conjectured that the back electromotive force induced on the stator windings by the rotor permanent magnets are sinusoidal. This conjecture causes errors in the estimation of speed and position. In this paper, the flux of stator winding was analysed by using finite element method, and the findings were used in position and speed sensorless field oriented control of permanent magnet synchronous motor. The validity of the proposed method was demonstrated by using Matlab Simulink program. [ABSTRACT FROM AUTHOR]