Abstract
Applications of concentrated winding machines prompt new solutions in designing the power converter which supplies the machine, since the machine average torque can be increased significantly by supplying three-phase current waveforms matching in full the trapezoidal back EMF. However, such current supply arrangements involve a third-harmonic current flowing into the machine. An innovative converter topology is presented to overcome this problem. This new configuration extends the standard layout of conventional PWM voltage source inverters by adding a fourth branch devoted to controlling the machine neutral voltage. Computer simulations are used to show the inverter modes of operation. Experimental results for a converter prototype which has been constructed using IGBTs are reported. >
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