Tool Talk
Woodworking Forum => Woodworking Forum => Topic started by: andrewvalen on December 18, 2015, 07:56:56 AM
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Hi everyone,
Folks, who can say me the process of phase transformation? I use the table saw. Its original motor is not working. I found 3phase tool for it, but there is a single ph in the workshop. So what would you do? maybe any adaptors?
Thanks
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Not being an electrician I can't explain how it works. A friend has a 3 phase milling machine running on single phase. Some how the 3 phase motor is "jump started" by using a single phase motor.
Like I said - I have no explanation. I just know that a smaller single phase motor (not connected to any machine) is used to start the 3 phase motor.
Al
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Most people, I think, without access to 3ph power, would rather
buy a 1ph motor than deal with the hassles of trying to
produce 3ph themselves. There are lots of sites devoted to showing
you how, but if I remember there are basically three methods:
a static phase converter (which you can make or buy), which is
effective but causes the motor to run at much less than full
power; a rotary converter (which you can also make, and involves
a second 3ph motor used as a generator to create a 3ph power
source), which is rather cumbersome; and digitally synthesized
3ph power, usu using a VFD (variable speed drive) running on 220v
1ph AC (which is expensive -- more expensive than buying a motor--,
and which is rumored to damage some motors because of its less-than-smooth
sine wave, but which adds the advantage of a variable speed controller
to a single-speed motor.) ... I've had a 1941 Unisaw with original 3ph
motor sitting around for about ten years while I make up my mind and find
the time to choose one of these options :smiley:
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I'm running a 5hp rotary phase generator/convertor plus 4 VFD for other tools.
Learn what the differences are. http://www.metalwebnews.com/electric.html
What is good for me may not be good for you, somethings you will love the speed control of a VFD,
others no need so why bother! My rotary phase onvertor is shop built using a vintage Crocker-Wheeler 3 phase motor and some "run" type capacitors from old air conditioning unit. Been running since 1995. I did grease the bearings as they making some noise.
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I'm very grateful for all replies.
Most people, I think, without access to 3ph power, would rather
buy a 1ph motor than deal with the hassles of trying to
produce 3ph themselves. There are lots of sites devoted to showing
you how, but if I remember there are basically three methods:
a static phase converter (which you can make or buy), which is
effective but causes the motor to run at much less than full
power; a rotary converter (which you can also make, and involves
a second 3ph motor used as a generator to create a 3ph power
source), which is rather cumbersome; and digitally synthesized
3ph power, usu using a VFD (variable speed drive) running on 220v
1ph AC (which is expensive -- more expensive than buying a motor--,
and which is rumored to damage some motors because of its less-than-smooth
sine wave, but which adds the advantage of a variable speed controller
to a single-speed motor.) ... I've had a 1941 Unisaw with original 3ph
motor sitting around for about ten years while I make up my mind and find
the time to choose one of these options :smiley:
I have the motor with these technical features https://www.mrosupply.com/motors/ac-motors/general-purpose-motors/26523_vm3546_baldor/ I asked another friend to borrow his VFD. So possibly I’ll try to connect it somehow.
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What would I do? I would find a single phase motor to use and forget about using the 3 phase motor. :grin: