by master control with auxiliary power

Full Title

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

Classification Context

Section:

ELECTRICITY

Class:

GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER

Subclass:

CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

Child Classifications

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• H02P 7/2 using multi-position switch, e.g. drum, controlling motor circuit by means of relays
• H02P 7/22 using multi-position switch, e.g. drum, controlling motor circuit by means of pilot-motor-operated multi-position switch or pilot-motor-operated variable resistance
• H02P 7/24 using discharge tubes or semiconductor devices
• H02P 7/3 using magnetic devices with controllable degree of saturation, i.e. transductors
• H02P 7/32 using armature-reaction-excited machines, e.g. metadyne, amplidyne, rototrol
• H02P 7/34 using Ward-Leonard arrangements