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Old 11-06-2012, 07:48 AM   #16
papalobster
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I saw this a bit late to comment. Used to work R&D at Baldor Generators and we would flash a dead gen with a 9 volt battery into the outlet.

Drill trick works too, essentially you are taking the residual magnetism in the drill rotor and turning it by hand, making it a small generator thereby introducing a small voltage into the generator "remagnetising" the rotor.

Now, why it lost it's magnetism during operation is a whole different problem

Is it an inverter generator?
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Old 11-06-2012, 09:25 AM   #17
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Laugh

Exciter on a generator...

Interesting stuff. I've heard of it before. Must be like loosing "magnetism" in a field coil. Magnetism is what makes the electricity...
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Old 11-06-2012, 09:57 AM   #18
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ah.... turn the drill to make it generate.... that makes sense. drills typically have a series wound (universal) motor. the brushes in the motor would serve as a rectifier. in any case, a voltage at the generator outlet would be fed into the regulator system & re-establish the electromagnetic field which re-establishes the residual (permanent) magnetism. there is no such thing as permanent AC magnetic field right.... so somewhere the exciter current is rectified & can then re-magnetise the cores of the exciter
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Old 11-07-2012, 03:53 AM   #19
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Not sure if it'll work with your particular generator, but if you need to flash the field, and it's electric start, just hit the key again for a split second. Works every time for me, and if you have a starter lockout switch, you get the voltage you need through the system, and no starter grinding. If not...well...whats a little starter overspeed between friends?

Interestingly, I also used this trick on a forklift that we started by arcing the starter, but once running it produced no power. Couldn't get it onto a trailer. Hit the key again just for shits and grins, and voila!--full power.
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Old 11-07-2012, 09:52 AM   #20
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If you have a brushless AC generator (alternator), it has a permanent magnet field similar to those used in most modern motorcycles. It's always energized, and "flashing" is never necessary. Almost all of the small AC generators today are the brushless type.
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Old 11-09-2012, 09:42 AM   #21
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Quote:
Originally Posted by ttpete View Post
If you have a brushless AC generator (alternator), it has a permanent magnet field similar to those used in most modern motorcycles. It's always energized, and "flashing" is never necessary. Almost all of the small AC generators today are the brushless type.
Um

Honda does not make any brushless generators.

All Baldor Generators I worked on from the 1.7kw PC17 to the TS250 (that largest they made while I was employed there) were all brushless as well. No magnets in any of them.
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Old 11-09-2012, 10:32 AM   #22
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I tried to do the 12V battery trick (suggested by my manual... like jump-starting) AND the reverse corded drill trick to excite mine. Neither worked. Took it apart and the rectifier board was fried. Don't know if it was fried before I tried to excite it or not.

While trying the 12V battery method, my 110v incandescent bulb illuminated a bit, but didn't stay on. Then it was dead after that.

Once my new rectifier board arrives, I'll re-diagnose. Hope to have a reliable generator for the potentially shitty winter.

Still 80 degrees F here. Should be freezing by next week.
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Old 11-09-2012, 05:56 PM   #23
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there are several ways to do the excitation, but on most, the excitation voltage, no matter where it comes from, is fed into a rectifier to convert it to DC, then regulated and sent to coils that excite the main generator windings. the main windings also feed into the control regulator.

put another way, the initial excitation is from a permanent magnet field and causes a small AC voltage to be generated in the main windings. that voltage is fed into a rectifier/regulator to power the electromagnetic field which produces a much larger excitation, and drives the generator up to system voltage. then system voltage is (also) fed into the R/R circuit for the field, so the main output is also powering it's own field

I would NOT put 120VAC on a generator that is set up to deliver 12VDC.
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Old 11-09-2012, 06:09 PM   #24
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My big generator is an ex-military unit driven by a 4 cylinder Jeep engine, and it has a separate 12 volt generator on the end for excitation and for battery charging. It also cranks the engine up by running it as a motor from the battery. Output is 240/120 volts single phase 3 wire, the same as the house wiring. It only runs at 1800 rpm, so it's very quiet.
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Old 11-11-2012, 11:40 AM   #25
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My standby Honda generator has not been used for a couple of years. I guess I need to dig it out from the back of the shed..... thanks for the advice :)
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Old 11-12-2012, 08:11 PM   #26
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Update- got my gen working today after replacing some parts. I used the corded drill flashing method to re-magnetize the field. Worked like a damn charm.

Highly recommended for simplicity.
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Old 11-12-2012, 11:38 PM   #27
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For the record, what was busted?
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Old 11-13-2012, 02:35 PM   #28
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Originally Posted by DirtyDog View Post


I tried to do the 12V battery trick (suggested by my manual... like jump-starting) AND the reverse corded drill trick to excite mine. Neither worked. Took it apart and the rectifier board was fried. Don't know if it was fried before I tried to excite it or not.

While trying the 12V battery method, my 110v incandescent bulb illuminated a bit, but didn't stay on. Then it was dead after that.

Once my new rectifier board arrives, I'll re-diagnose. Hope to have a reliable generator for the potentially shitty winter.

Still 80 degrees F here. Should be freezing by next week.
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For the record, what was busted?
See above. And yes, it's now down to freezing (at night).
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Old 11-13-2012, 04:36 PM   #29
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See above. And yes, it's now down to freezing (at night).
Whoops, missed that bit. Stay warm. Forecast calls for a low of 68F on Thursday night here, yikes.
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Old 11-13-2012, 05:04 PM   #30
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Whoops, missed that bit. Stay warm. Forecast calls for a low of 68F on Thursday night here, yikes.
My condolences.......

Maybe you'll get a volcanic eruption to warm things up......
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