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Tool Talk Discussion Forum

Indcution motor and a generator

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Charlie M

01-22-2008 16:07:39




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I recently had my breaker box set up so I can plug in my portable generator for the next time the power is off. However my water pump (I'm on a well) is an induction start motor and my generator won't start an induction motor. Its wired for 220V. Is there anyway around that problem without changing the water pump motor? Would it be the same problem if the motor was wired to 110V.With a wood stove, propane kitchen stove and my generator I can live pretty well during a power outage - just need to figure out how to get water.

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Oldmax

01-24-2008 16:04:43




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 Re: Indcution motor and a generator in reply to Charlie M, 01-22-2008 16:07:39  
The only reason I could think that a generator would not start an induction motor is that it was a DC generator , such as a small gasoline powered welder that puts out about 100 volts dc to power Grinders and such . they will only run motors with brushes "or wound Armatures" .



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John T

01-24-2008 06:59:37




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 Re: Indcution motor and a generator in reply to Charlie M, 01-22-2008 16:07:39  
Charlie, It can take something like 5 or 6 times the run current to start that motor so the genny isnt rated high enough or you may have excess voltage drop from long wire runs or too small conductors. Try the genny closer to the pump with bigger feed wires n she may start it??? The motor may well be a split phase or a capacitor start which is better (ifffff the capacitors are okay???) I doubt its a repulsion start induction run,,,,, but regardless you either need a bigger genny or less wire length with bigger conductors..

John T

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Bus Driver

01-23-2008 04:25:45




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 Re: Indcution motor and a generator in reply to Charlie M, 01-22-2008 16:07:39  
Have you reached this conclusion based on some text in a manual or based on actually trying it? A 4000 watt generator typical 8HP gasoline engine should be able to start and run a 3/4 hp pump. It will be far better at 240 volts. It probably will not work at 120 volts.



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buickanddeere

01-22-2008 22:56:02




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 Re: Indcution motor and a generator in reply to Charlie M, 01-22-2008 16:07:39  
Your generator is too small and/or the extension cords are too light weight. The same pump, wired 120 or 240. The small portable generator will have more success starting the 240V . If your generator isn't at least 6500W if you are going to try starting well pumps, AC units, air compressors



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Bob

01-22-2008 17:41:45




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 Induction start? in reply to Charlie M, 01-22-2008 16:07:39  
That's a rather generic discription.

Is it:

repulsion-induction? (Old-fashioned, easy-starting motor?)

split phase?

split phase capacitor start?

split phase capacitor run?


Is it a standard pumping head, or a submersible pump/motor?



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dave guest

01-22-2008 17:31:26




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 Re: Indcution motor and a generator in reply to Charlie M, 01-22-2008 16:07:39  
How big gen. How big pump motor?



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Greg_Ky

01-22-2008 16:23:58




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 Re: Indcution motor and a generator in reply to Charlie M, 01-22-2008 16:07:39  
Need more info.(pump hp. - genny size) It can take up to six times the running amps. to start an induction start/run motor.



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