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Generators & Motors General Discussion Antique Generators, Light Plants and Old Electric Motors: Questions and answers about restoring and showing old power generation systems.

Generators & Motors General Discussion

Converting a Single phase motor into a generator


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  #1  
Old 05-05-2012, 08:22 AM
robert hamilton robert hamilton is offline
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Question Converting a Single phase motor into a generator

Hi im not sure if this it the right place but i have a 3hp metropolitan vickers electric motor that i want to convert into a generator to drive with one of my engines how would i do this any help would be great thanks

Robert Hamilton
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Old 05-05-2012, 01:21 PM
Jim Rankin Jim Rankin is offline
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Default Re: Converting a Single phase motor into a generator

If it is a brushless motor, your options are limited. Most motors will retain enough magnetism to excite as an induction generator when you spin them with an engine. Voltage output is somewhat dependent on how fast you spin it and what the voltage rating of the machine is when used as a motor.

HOWEVER, it will likely fall on its face when you put much of a load on it. Induction motors work best as generators when operated in parallel with the power grid or a larger generator. The grid excites the generator(supplys reactive current) and as long as the shaft is turning faster than synchronous speed, it will generate real power (WATTS) into the grid.

Now if you want to go with permanent magnets on the rotor, you can run at most any rpm and rectify the "wild AC" to DC and charge batteries, operate DC equipment and or run an inverter to go back to standard frequency AC.
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Old 05-05-2012, 03:00 PM
dalmatiangirl61 dalmatiangirl61 is online now
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Default Re: Converting a Single phase motor into a generator

Yes electric motors can be turned into generators Check out www.fieldlines.com . Of course it depends on what kind of power you want too, AC or DC? If you want plain old 120/240 60hz your better off with a normal generator, most here will probably suggest something green

I've been spending a fair amount of time reading the fieldlines site, lot of stuff there you won't learn out of a book.
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Old 05-05-2012, 05:10 PM
Joseph Joseph is offline
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Default Re: Converting a Single phase motor into a generator

There is a book called Motors as Generators for micro-hydro power that covers this and tells how to fiqure the amount of capacitor excitation is needed. The ISBN number is 1-85339-286-3 and the author is Nigle Smith.
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Old 05-05-2012, 07:37 PM
Joseph Joseph is offline
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Default Re: Converting a Single phase motor into a generator

Here is a link to a guy who did what you are talking about

http://www.qsl.net/ns8o/Induction_Generator.html
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Old 05-21-2012, 03:03 AM
robert hamilton robert hamilton is offline
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Default Re: Converting a Single phase motor into a generator

The motor is a Repulsion induction motor would that make it harder to convert to a generator the motor has a set of brushers

Cheers Rob
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Old 05-21-2012, 10:29 AM
Jim Rankin Jim Rankin is offline
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Default Re: Converting a Single phase motor into a generator

Just as a guess, I expect you would see little effect from the brushes when they're riding the rotor. Normal speed for the motor will have them raised by a centrifugal mechanism. If there's a problem when they're down, lock them up.

Treat it like an induction motor as far as capacitors etc.
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Old 05-21-2012, 05:04 PM
Merv C Merv C is offline
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Default Re: Converting a Single phase motor into a generator

Rob,
While I don't know how it is done, a three phase motor with six terminals can easily be converted to a generator which believe has a 240 volt AC output.
I plan to do the same with a 3hp three phase motor I have here and couple it to my Blackstone Diesel.
Here is a link to a thread on the Stationary Engine forum.

http://www.stationary-engine.net/for...or+phase+motor

Merv.
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Old 05-25-2012, 10:51 PM
Jim Rankin Jim Rankin is offline
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Default Re: Converting a Single phase motor into a generator

Here's a link to a very scholarly treatise on induction machines as generators.
http://www.frenchriverland.com/Motor...th_UK_1994.pdf
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