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#129341 - 01/24/05 05:10 PM 3 ph motor supplied by a single phase supply
splitzapper Offline
Junior Member
Registered: 01/21/05
Posts: 6
Loc: Davao
hello there..its me once again.
i heard that it is possible for a 3-phase motor to be connected to a single phase supply with a use of a capacitor..
1. what would we call that set-up
2. is this a common practice?
3. how is it done? (please if you know some diagrams, i would really appreciate it.)
thanks a lot..
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#129342 - 01/24/05 08:47 PM Re: 3 ph motor supplied by a single phase supply
Bjarney Offline
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Registered: 04/10/02
Posts: 2527
Loc: West-Southern Inner-Northeast ...
 
   www.airraidsirens.com/proj_3phase.htm is a very well thought out project. A classic rural phase-converter situation for multiple motors is http://electrical-contractor.net/ubb/Forum7/HTML/000234.html
Check though usenet {Google Groups} for metalworking and woodworking newsgroups.




[This message has been edited by Bjarney (edited 01-24-2005).]
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#129343 - 01/24/05 09:33 PM Re: 3 ph motor supplied by a single phase supply
splitzapper Offline
Junior Member
Registered: 01/21/05
Posts: 6
Loc: Davao
thanks Mr. Moderator, but the other URL would not work. Still if there are some diagrams , i would truly appreciate it.
I would just like to know how a 3-ph load(in this case a motor) can be supplied by a single source with a help of a capacitor?
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#129344 - 01/25/05 09:09 AM Re: 3 ph motor supplied by a single phase supply
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2527
Loc: West-Southern Inner-Northeast ...
  http://www.airraidsirens.com/proj_3phase.html

Applicance-repair outfits stock motor-rum and motor-start capacitors.

It is not a trivual project.
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#129345 - 01/29/05 11:09 AM Re: 3 ph motor supplied by a single phase supply
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
Bjarney,
Wow, that brings back some memories.
We used to have to be able to start a three-phase motor using this very type of static converter, at Technical college.
The guy that wrote that was right though, the capacitors are very un-forgiving, with multiple start-stop cycles.
Years later, I'm still combing the paper out of my hair.
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