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#129341 - 01/24/05 09:10 PM 3 ph motor supplied by a single phase supply  
splitzapper  Offline
Junior Member
Joined: Jan 2005
Posts: 6
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..


Oh Yeah!

Tools for Electricians:

#129342 - 01/25/05 12:47 AM Re: 3 ph motor supplied by a single phase supply  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
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 https://www.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).]


#129343 - 01/25/05 01:33 AM Re: 3 ph motor supplied by a single phase supply  
splitzapper  Offline
Junior Member
Joined: Jan 2005
Posts: 6
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?


Oh Yeah!

#129344 - 01/25/05 01:09 PM Re: 3 ph motor supplied by a single phase supply  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
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.


#129345 - 01/29/05 03:09 PM Re: 3 ph motor supplied by a single phase supply  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
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.


Let's face it, these days if you're not young, you're old - Red Green grin


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