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AFCA Forums > Antique Fan Collectors Association > Pre-1950 (Antique) > Rotor bars vs rated stator cycle/amount of poles:
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AFCA Forums > Antique Fan Collectors Association > Pre-1950 (Antique) > Rotor bars vs rated stator cycle/amount of poles: | |||||
| Moderated by: Steve Cunningham, Stan Adams, Rod Rogers |
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| Rotor bars vs rated stator cycle/amount of poles: | Rate Topic |
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| Posted: Mon Mar 22nd, 2021 02:38 am |
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1st Post |
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Rob Duffy AFCA Member 
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Has anyone done any research regarding the amount of poles in a stator versus the amount of rotor bars in the rotor for that particular stator? From my understanding, for example, a rotor from a 133 cycle motor that's designed to run at a similar speed compared to a 60 cycle 4 pole motor, would not function correctly in a 60 cycle 4 pole stator.
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| Posted: Mon Mar 22nd, 2021 07:06 pm |
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2nd Post |
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Jim Kovar AFCA Member 
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Hi, Rob. Couldn't find any poop on rotor bars to stator poles. But did come across this... https://books.google.com/books 
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| Posted: Mon Mar 22nd, 2021 08:21 pm |
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3rd Post |
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Steve Rockwell AFCA Member 
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If it's any help..... 
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| Posted: Sun Apr 4th, 2021 01:46 am |
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4th Post |
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Jim Kovar AFCA Member
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| Posted: Sun Apr 4th, 2021 02:16 am |
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5th Post |
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Rob Duffy AFCA Member
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Jim Kovar wrote: This is a really good read, thank you!
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| Posted: Mon Apr 5th, 2021 09:01 am |
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6th Post |
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Rick Huckabee AFCA Member 
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Emerson 6-pole Rotors have more bars than do the 4-pole . Using a 4-pole rotor in a 6-pole motor will result in excessive electrical noise when running. Start-up appears unaffected.
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| Posted: Mon Apr 5th, 2021 11:58 am |
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7th Post |
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Michael Rathberger AFCA Member 
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When the question came up I read through one of my old motor books from 1914, there was no formula for it. Then I had a question from a buddy about number of bars in a 21645 rotor, which was 19, which I found odd. Then I took a look at a 6wing tank v a 4 and the poles on the rotor, the 6 had a lot more although I never bothered counting them all. The book says that one -- the current through the windings or the rotor being pulled has to have a "lag," or run just a little behind the other for best efficiency. I can only think the odd number has to do with the lag. Last edited on Mon Apr 5th, 2021 01:36 pm by Michael Rathberger |
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| Posted: Mon Apr 5th, 2021 08:04 pm |
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8th Post |
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Alex Rushing AFCA Member 
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Rick Huckabee wrote: Emerson 6-pole Rotors have more bars than do the 4-pole . Using a 4-pole rotor in a 6-pole motor will result in excessive electrical noise when running. Start-up appears unaffected. Good info! Thanks! I'd like to add I've experienced the inverse of that. I tried a 29668 6-pole motor rotor in a 27648 4-pole big motor. It made incredible growls starting, but was fairly smooth at speed. Tried, because my 27648 rotor has some notable wear.
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