Electric Drives and the Speed Control of DC Motors

Course notes on electric drives, beginning with the drive as a combination of prime mover, transmission equipment and mechanical load and the electric drive as the electromechanical device that converts electrical energy into mechanical energy to impart motion to different machines. Establishes the major advantage of the direct current motor over the alternating current motor as the relative ease of speed control, achieved either by varying the voltage or the field flux, with the voltage varied from zero up to rated speed and the flux weakened above it, and works through the armature-voltage and field-control methods, the chopper and converter circuits that supply them, and the back electromotive force and armature resistance equations from which the operating point is calculated.