Implementation of Random Pulse Width Modulation Techniques for the Open-End Winding Five-Phase Motor Drives to Reduce Acoustic Noise and Harmonic Distortion

Abstract

AbstractMulti-phase machine drives nowadays found its applications in electric vehicles, ship propulsion, space craft, drilling machines. High-speed switching of the space vector pulse width modulation techniques (SVPWM) generates high rate of change of currents and voltages in the inverters, which causes serious electromagnetic interference. These generate harmonics in output voltages and currents and high acoustic noise is produced. All these applications produce high acoustic noise and high harmonics distortion which disturbs the human being and some electronics devices that are nearer to the drive. Hence, this paper provides a solution by implementing random pulse width modulation (PWM) techniques for the dual-inverter fed open-end winding (OeW) five-phase induction motor drives to reduce acoustic noise levels that are produced in output effective phase voltages and currents. Randomization in modulating signal; randomization of high-frequency triangular carrier signals; both modulating signal and carrier randomization; variable switching frequency randomization of both modulating signal and high-frequency triangular carrier signals methods are implemented. To show the effectiveness of the proposed random techniques over the conventional continuous PWM techniques, simulation and experimental studies on 1 Hp proto type five-phase motor are presented.KeywordsAcoustic noiseHarmonic distortionMulti-level multi-phase drivesOpen-end windingRandom pulse width modulationSpace vector pulse width modulation