Patent classifications
H
ELECTRICITY
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H02
GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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H02P
CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
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7/00
Arrangements for regulating or controlling the speed or torque of electric DC motors
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H02P7/06
for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current
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H02P7/18
by master control with auxiliary power
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H02P7/22
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
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