small generator voltage regulator problem

Old 04-26-11, 09:20 AM
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small generator voltage regulator problem

sp-gg200 1.4kw 4 stroke gasoline power for a brushed rotor with an active voltage regulator and a four winding stator, 120Vac, 12Vac rectified to DC elsewhere, two more windings are input to the voltage regulator. Presumably, one winding provides power to the vreg and the other provides sample output voltage.

All four windings show nominal resistance, 1 to 6 ohms. So none are open and none shorted. I replaced the vreg with a new one because the gas motor pulled very hard (near stall) under no load, but spun up to speed when I disconnect the vreg from the rotor.

The old vreg was dumping full current onto the rotor. After finding no problem with the stator windings I replaced the vreg. But the new vreg does the same thing. Throws full voltage onto the rotor.

Anybody seen this before? Any suggestions?

Old 04-28-11, 06:27 PM
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I haven't seen this before and don't often encounter electrical problems with generators. I would suspect a diode problem or a full short. Do any of the wires get really hot when this is happening? If so, that wire will probably lead you to the problem area.
Old 05-26-14, 10:12 AM
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there is no issue with the voltage regulator. When youíre running a generator, it will always produce full voltage output, the current output from a generator determines how much load youíve applied on that particular generator. I hope thatís what you meant by dumping full voltage on the rotor. If the rotor has full voltage instead of the generator output, that means there is a circuit issue and there might be some protection diode which has blown and is shorting output voltage to the body of the generator.

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