DC drives fed by controlled rectifiers and choppers; squirrel-cage induction motor drives controlled by AC voltage controllers, inverters, and cycloconverters; slip-power controlled wound-rotor induction motor drives; and inverter and cycloconverter controlled synchronous motor drives, including brushless DC and AC motor drives. Both open-loop and closed-loop drives are discussed. Apart from thyristor converters, GTO and power transistor converters are also covered. Attention is also given to the interaction between the motor and converter, and to the relative performance features of various drives.