by variation of field (H02P9/08, H02P9/10 take precedence)

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Arrangements for controlling electric generators for the purpose of obtaining a desired output > by variation of field (H02P9/08, H02P9/10 take precedence)

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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 9/20 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 (H02P9/34 takes precedence)
• H02P 9/32 using magnetic devices with controllable degree of saturation (H02P9/34 takes precedence)
• 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