Abstract
A mongst many types of electrical motors, induction motors still enjoy the same popularity as they did a century ago. Several factors which include robustness, low cost and low maintenance have made them popular for industrial applications when compared to dc and other ac motors. Another aspect in induction motor drives which has been researched recently is the use of mult iphase induction motors where the number of stator phases is more than three. Here, a mu lti-phase system is a system with mo re than three stator phases. For machine drive applications, mult iphase induction motor could potentially meet the demand for h igh power electric drive systems which are both rugged and energy efficient. High phase number d rives possess several advantages over conventional three phase drives such as reducing the amp litude and increasing the frequency of torque pulsation, reducing rotor harmonic currents, reducing the current per phase without increasing the voltage per phase, lowering the dc link current harmon ics, higher reliability and increased power. Multiphase induction motors have found many applications such as electric/hybrid vehicles, aerospace applications, ship propulsion etc.
Highlights
Three-phase induction machines are today a standard for industrial electrical drives
It is believed that drive system with mult iphase induction motors will improve the system reliability
All control schemes developed till date were for 30 degree phase shift only.[4]-[5] (Figure 17 and 18)
Summary
Three-phase induction machines are today a standard for industrial electrical drives. With modern techniques of field oriented vector control, the task of variable speed control of induction machines is no longer a disadvantage, the need to increase system performance, when facing limits on the power ratings of power supplies and semiconductors, motivates the use of increased phase number, and encourages new PWM techniques, new mach ine design criteria and the use of harmonic current and flu x co mponents. In the most common of such structures two sets of th ree phase windings are spatially phase shifted by 300 electrical (Figure 1). In such motors each set of three phase stator winding is excited by a three Phase inverter, total power rating of the system is theoretically doubled. Ward and Harner fo r the first time in 1969 have
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