motor output question

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nickl304

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ok, I have a question that the electrian at work couldn't answer.
what voltage would I get if i use a 110v motor to drive a 220v motor? I want to power the 110v and drive the 220v with a belt or coupler. So what voltage and amperage would I get from the 220v motor? I understand you don't get something for nothing thats why I want to drive a 220v motor. and what other problems would I have by doing this?
 
Re: motor output question

Most of the common general-purpose induction motors will not operate as a generator, unless they are connected to the AC line and "overdriven", that is, operated above their rated speed.

A DC shunt or compound wound motor could be operated as you describe.

What voltage and current could you expect? Depends on -
a. the type and rating of the "generator" machine.
b. the speed of operation.
c. the power input from the driving motor.

Ed
 
Re: motor output question

It is possible to create your own ?motor generator set.? I think the biggest problem is a loss of power. If the two components were not designed for the application you describe, then the set will be very inefficient. I would not be surprised if you get back only one watt for every ten watts you put in. A better solution might be a step-up transformer, but I do not know what problem you are trying to solve.
 
Re: motor output question

nick -

Over driving a 3 ph induction motor to get it to generate turns the motor into an "Induction Alternator".

I've never seen one, just pictures and descriptions of operation. The biggest difference in the pictures, is the rotors look different from a standard induction motor.

My underatanding is they need to be driven overspeed about the same amount they would run under synchronus speed as an induction motor - likely about 3-5%.

Also, as Ed said, they need to be connected to an AC line to excite and generate.

I'm not sure what the "110V" and "220V" has to do with the question, unless you are asking if this can be done with single phase motors?

If that's it, I've never heard of a 1ph motor being used as an induction alternator, I suspect they would not work, but I don't know that.

Don't forget, I've never seen one, just read about them.

carl
 
Re: motor output question

Nick, I presume you only have 120V available instead of the usual 120/240 in which case you don't need to do this. If you do however, you must maintain constant RPM to generate 60Hz. I would think you would need a synchronous motor driving an alternator with appropriate control circuitry. You would also pay the price of inefficiency of both the motor and the alternator. I would not bother with it. I would use a stepup xfrmr instead. It would be quieter, cheaper, and more efficient.
 
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