H02P7/32 - CPC Classification

Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using armature-reaction-excited machines, e.g. metadyne, amplidyne, rototrol

• H02P7/325 » {whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value} 2