System Efficiency using PWM Switching Strategies
Mohammed Hussein Baqir

Mohammed Hussein Baqir, Lecturer, College of Electrical and Electronic Technique in Baghdad, Iraq.
Manuscript received on 20 May 2014 | Revised Manuscript received on 25 May 2014 | Manuscript published on 30 July 2014 | PP: 1-6 | Volume-3 Issue-2, May 2014 | Retrieval Number: B1049053214/2014©BEIESP
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Abstract: Pulse Width Modulation (PWM) is the technique of using switching devices to produce the effect of a continuously varying analogue signal; this PWM conversion generally has very high electrical efficiency. In controlling either a three-phase synchronous motor or a three-phase induction motor it is desirable to create three perfectly sinusoidal current waveforms in the motor windings, with relative phase displacements of 120°. The production of sinewave power via a linear amplifier system would have low efficiency, at best 64%. If instead of the linear circuitry, fast electronic switching devices are used, and then the efficiency can be greater than 95%, depending on the characteristics of the semiconductor power switching.
Keywords: It is Desirable to Create three Perfectly Sinusoidal Current Waveforms in the Motor Windings, with Relative Phase Displacements of 120°.

Scope of the Article: Routing, Switching and Addressing Techniques