by variation of field

Full Title

Arrangements for controlling electric generators for the purpose of obtaining a desired output > by variation of field

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 9/16 due to variation of ohmic resistance in field circuit, using resistances switched in or out of circuit step by step
• H02P 9/2 due to variation of continuously-variable ohmic resistance
• H02P 9/24 due to variation of make-to-break ratio of intermittently-operating contacts, e.g. using Tirrill regulator
• H02P 9/26 using discharge tubes or semiconductor devices
• H02P 9/32 using magnetic devices with controllable degree of saturation
• H02P 9/34 using magnetic devices with controllable degree of saturation in combination with controlled discharge tube or controlled semiconductor device
• H02P 9/36 using armature-reaction-excited machines
• H02P 9/38 Self-excitation by current derived from rectification of both output voltage and output current of generator