Chaos-Based Generation of PWM-Like Signals for Low-EMI Induction Motor Drives: Analysis and Experimental Results

Michele BALESTRA  Alberto BELLINI  Sergio CALLEGARI  Riccardo ROVATTI  Gianluca SETTI  

IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.1   pp.66-75
Publication Date: 2004/01/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
switching power conversion,  induction motor,  PWM,  EMI,  FM,  chaos,  

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The reduction of undesired electromagnetic emissions in switched power converters is a hot topic. Here, we propose a chaos based methodology to synthesize PWM-like signals for controlling the drives of induction motors. This approach reduces drastically the interference due to the drive-motor ensemble, and does not significantly alter the motor performance. The benefit is a 20 dB reduction in the peak of the emitted power density spectrum. This result is herein confirmed three times: first with an analytical approach based on approximations whose impact is progressively reduced; then by means of simulation; finally by laboratory testing of a working prototype.