Near-Complete Suppression of Harmonic Currents in SPMSMs Caused by Back EMF and Dead Time

This article introduces a novel algorithm for suppression of phase current harmonics in three-phase sinusoidal surface-mounted permanent magnet synchronous machines (SPMSMs) caused by nonideal back EMF waveform and dead time effects. Proposed feedback acquisition chain obtains an exact information on all the relevant within each period fundamental. Design harmonic controller based internal model control principle is given. The outlines details implementation results verification performed both computer simulations experimentally, using laboratory prototype machine. Experimental results, obtained presence nonsinusoidal back-EMF with erroneous compensation, prove ability proposed solution to remove stator quickly, just two fundamental periods, thus, eliminate torque ripple.