A new RPWM technique with harmonics injection and frequency randomized modulation

This paper presents a new control strategy for the reduction of the electromagnetic vibration (and thus the acoustic noise emitted) in the external casing of a three-phase induction machine fed by a three-phase inverter. We compared the measurements of classical technique SPWM (Sinusoidal Pulse Width Modulation) and technical basis of this new strategy (without random parameters) with the new technique HIPWM-RWA (Pulse Width Modulation with Harmonics Injection and Randomized Working Angle) in an induction machine 1 KW idling.