Author Topic: #3 Phase Generator Flashing  (Read 1964 times)

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(unknown)

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#3 Phase Generator Flashing
« on: March 04, 2005, 04:08:35 PM »
I have an engine drive 22kw induction 3 phase generator, commercially made, which will not generate any voltage. It has been flashed while turning at rated speed and above with 12 and 24 vdc without results. The generator has been removed for the engine and been flashed with the 12 vdc which has pulled the rotor to the field coils. After assembly the unit still does not produce voltage. All help is appreciated.
« Last Edit: March 04, 2005, 04:08:35 PM by (unknown) »

Flux

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Re: #3 Phase Generator Flashing
« Reply #1 on: March 05, 2005, 12:42:14 AM »
If it is an induction generator first check that the engine governor is running at the rated speed, if so it is almost certainly a failure in the capacitors, short circuit or low capacitance. Failing that you have a serious winding fault, I wouldn't have expected the rotor to pull over when you flashed it if the winding is balanced.


Is it really an induction generator, that is a bit odd for a commercial thing. Are you sure it is not a capacitor excited brushless machine with diodes on the rotor. If so check the diodes as well.


Flux

« Last Edit: March 05, 2005, 12:42:14 AM by (unknown) »

(unknown)

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Re: #3 Phase Generator Flashing
« Reply #2 on: March 11, 2005, 07:04:02 AM »
The engine speed has be verified by two difference instruments.  The windings have checked out OK on a scope.  The rotor is laminated material and has no diodes.  There were no capacitors with the unit.

Can you explain how the rotor becomes magnetized and was this unit intended to be used as a standalone unit?


Dials

« Last Edit: March 11, 2005, 07:04:02 AM by (unknown) »