Drives and control strategies for permanent magnet machines

Permanent magnet machine drives are relatively expensive with a principal merit of high performance. They also tend to be relatively small-circa 10´s of kW max. These considerations effectively eliminate the thyristor and GTO from consideration. The use of a full switch has led to the common use of DC link voltage source 3 phase inverters as by far the most common circuit. Here, the use of such drive circuits for the control of PM machines is described by the author