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Tractor Talk Discussion Forum

electric motor question

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upred

12-11-2004 09:31:21




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my dad just got a used metal lathe with a three phase motor on it, it also has a reversing lever. my question is since we don,t have three phase at the shop can I put on a new 220 single phase motor on it and still have the reverse, or would I be better off with a phase converter? Also where and what type phase converter?

Rick




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Davis In SC

12-11-2004 19:31:20




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 Re: electric motor question in reply to upred, 12-11-2004 09:31:21  
You might have trouble with motor starting the spindle if you use a static-type converter. I had one on a Rockwell lathe, & had to "Help" the spindle get started. A rotary converter should do fine.



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Bus Driver

12-11-2004 18:34:26




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 Re: electric motor question in reply to upred, 12-11-2004 09:31:21  
There are instant-reversing single phase motors for just such applications, but they are not low cost. If using a VFD, the reversing must be done at and by the VFD. The VFD does have many advantages.



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Mike Burdick

12-11-2004 16:37:14




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 Re: electric motor question in reply to upred, 12-11-2004 09:31:21  
Rick,

What kind of lathe do you have and what is the horsepower?

If you want to leave it 3-phase, you can make a rotary phase converter. Or as already suggested, you can buy a VFD (variable frequency drive) that allows for single phase in and three phase out. It also allows you to have variable speed - which is VERY handy on a lathe!

Get back with us with a little more information and we'll help you get in running!

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Gerald J.

12-11-2004 09:35:37




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 Re: electric motor question in reply to upred, 12-11-2004 09:31:21  
A single phase motor will work just fine, may be larger for the same horsepower. But it will have to nearly stop before reversing. The three phase motor can be reversed while running at full speed (but its hard on it). The wiring for reversing the single phase motor is different. It takes swapping the connections of the start winding for reversing. The three phase motor swaps two line leads for reversing.

You can use a phase convertor, or a variable speed electronic drive which is often more cost effective these days.

Gerald J.

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