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  #1  
Old 05-31-2022, 11:38 AM
okdirt okdirt is offline
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Default Rotary phase converter

Ok here's a question for the group.
Can you use a wye motor for a RPC?
If so how?
I've always been told you cannot, it has to be a delta but you can run a wye off it.
Have a 14hp wye that I'd like to use to upgrade my present 7 1/2 hp delta. More power is always good right? Hehe
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  #2  
Old 05-31-2022, 06:59 PM
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I have never heard that. However the 20 hp I have for an idler is a delta wired motor.

I did some digging and came across this https://www.northamericaphaseconvert...ontrol-panels/

This place will sell you a control panel and you supply a motor. On the page it gives you some specifications on the motor. No mention is made of Wye or Delta.

Scott
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  #3  
Old 05-31-2022, 09:42 PM
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greywynd greywynd is offline
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Quote:
Originally Posted by Scotts View Post
I have never heard that. However the 20 hp I have for an idler is a delta wired motor.

I did some digging and came across this https://www.northamericaphaseconvert...ontrol-panels/

This place will sell you a control panel and you supply a motor. On the page it gives you some specifications on the motor. No mention is made of Wye or Delta.

Scott

Those look like a nice option for a phase converter.


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  #4  
Old 06-01-2022, 07:00 PM
okdirt okdirt is offline
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Nice looking units for sure, bet they have nice prices on them too...lol
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  #5  
Old 06-01-2022, 07:26 PM
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Quote:
Originally Posted by okdirt View Post
Nice looking units for sure, bet they have nice prices on them too...lol

First pic is complete unit w motor that I would need for my lathe. Other pics are for the control box only, you supply your own motor.
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  #6  
Old 06-02-2022, 04:30 AM
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Yes you can use a Wye wound motor as the idler/generator. A 14HP isn’t a standard NEMA size though, maybe you mean a 15? Swapping a 7.5 for a 15 will require more start and running caps, as well as a bigger contactor and wire.
Will your power service handle the starting of a 15HP RPC?
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  #7  
Old 06-02-2022, 05:40 AM
okdirt okdirt is offline
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Now that dumb axx feeling comes......... I was trying it with a 40 amp service and kept blowing one leg. Nearly that at full load, start up current would be 1 1/2 times that or 60 amps.
The details will get me everytime.
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  #8  
Old 06-02-2022, 07:40 AM
Lew Hartswick Lew Hartswick is offline
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I'm pretty sure the current in the three wires don't have a clue how the motor is wired inside. :-)
...lew...
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