Re: Will this work? VFD question. Silly.
- From: Grant Erwin <grant@xxxxxxxxxxxxxxxxxx>
- Date: Thu, 01 Dec 2005 09:26:04 -0800
Eric R Snow wrote:
Just wondering. I'm not gonna try it out. No sense in it. But here it is: Three 240 volt single phase motors are wired together in delta, the shafts are connected together in line, and the starting windings are disconnected. If connected to a VFD, or any three phase source for that matter, will they spin up? Will they maybe need to be rotated at assembly 120 degrees to each other? I think it will work. Just idle curiosity. We all know how dangerous that is. Thanks, Eric
Basically you have L1, L2, L3 each 120 degrees apart. If you feed motor 1 L1-L2 (which would be 208 volts) and motor 2 L2-L3 and motor 3 L1-L3 then if they run on 208 volts they should all run OK but with no start windings they wouldn't start, as there is no rotating magnetic field when connected to a single phase.
My intuition is they'd just sit there and hum, but if you didn't disconnect the start windings they would all work OK.
The load would be balanced as long as each motor was loaded the same. Only way to do that would be to have 3 208-230V motors each with shafts at both ends, and use shaft couplers e.g. Lovejoy ..
GWE .
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- Will this work? VFD question. Silly.
- From: Eric R Snow
- Will this work? VFD question. Silly.
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