In industrial applications speed control ofmotors is very common require-ment. Thisexperiment unit is designed to study of speedcontrol process of a small dc motor. The unithas following features.1. Motor unit, which comprises a smallpermanent magnet dc motor, rated voltage 12Vdc, rated current 0.25A at normal run and0.4A at full load, the torque 75 gm / cm andmaximum speed in excess of 3200 rpm ( open loop