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Tool Talk Discussion Forum

2 phase electric

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fencline

10-16-2004 16:55:30




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I did not think there was such a thing but I now have seen a Bridgeport and a Jointer with 2 Phase motors. (on the motor I.D. plate by PH there is the #2) Does anyone know where / why this was used (both 25+ year old machines) Can It be hooked up to two legs of phase converter? The bridgeport I am talking of is hooked to a rotary converter and seems to work OK but seems to start slow.Any information would be appreciated
Thanks,
Andy

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brianh

10-17-2004 05:59:45




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 Re: 2 phase electric in reply to fencline, 10-16-2004 16:55:30  
Check the frequency rating on the motor too. A lot of the two-phase electrical distribution in bigger cities was done at 25 cycles. That might also explain why the motor is big for its size. Brian



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Gerald J.

10-16-2004 17:22:56




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 Re: 2 phase electric in reply to fencline, 10-16-2004 16:55:30  
2 phase makes a fine rotating field for a motor. Most all single phase motors start as two phase motors. The two phases are 90 degrees apart. The phases for three phase are 120 degrees apart.

A T connected transformer on a 3 phase system can get you two phases 90 degrees apart. Basically the connections are: One motor phase is connected line to line. The other phase is connected (with a transformer to correct the voltage) from the mid point of that first line to line connection to the third phase. Called a Scott-T connection.

A three phase motor is probably a little more compact than a two phase motor and should run a bit smoother.

Gerald J.

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Bob

10-16-2004 17:14:44




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 Re: 2 phase electric in reply to fencline, 10-16-2004 16:55:30  
Here's a link to a thread over at Practical Machinest that gives some information on this.



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paul

10-17-2004 08:16:09




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 Re: 2 phase electric in reply to Bob, 10-16-2004 17:14:44  
???

--->Paul



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Bob

10-17-2004 09:09:39




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 OOOPS! in reply to paul, 10-17-2004 08:16:09  
Link

Link



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