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

Child Classifications

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• H02P 7/20 using multi-position switch, e.g. drum, controlling motor circuit by means of relays (H02P7/24, H02P7/30 take precedence)
• 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 (H02P7/24, H02P7/30 take precedence)
• H02P 7/24 using discharge tubes or semiconductor devices
• H02P 7/30 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
• H02P 7/348