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AFCA Forums > Antique Fan Collectors Association > Post-1950 (Vintage) > Motor surface temp vs winding temp

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Motor surface temp vs winding temp  Rate Topic 
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 Posted: Tue Sep 26th, 2017 11:41 pm
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Richard Daugird
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I have read the average allowable temperature for a motor winding above ambient temperature is 40° C. Just curious how hot would the windings to be compared to the outer case? I realize this would vary on different motors. I have a round motor mobile air Westinghouse Riviera, small one, around motor Mobileaire  and a hex motor mobile air, all running right now. 

Last edited on Tue Sep 26th, 2017 11:49 pm by Richard Daugird

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 Posted: Tue Sep 26th, 2017 11:44 pm
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Richard Daugird
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The little Riviera is about 17 C over Ambient. The round motor is about 42 C over Ambient. This motor has an issue, only runs on high speed. I just turned it off. These are both running in an air-conditioned room about 75° F or 23° C.

Last edited on Tue Sep 26th, 2017 11:52 pm by Richard Daugird

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 Posted: Tue Sep 26th, 2017 11:46 pm
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Richard Daugird
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The hexmotor is in an air-conditioned room about 85° F, or 30 C. It's running about 24° C over ambient. Should I be worried about the motor running 42 c over Ambient? Pardon the spelling I'm using my cell phone I don't have my computer with me.

Last edited on Tue Sep 26th, 2017 11:54 pm by Richard Daugird

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 Posted: Wed Sep 27th, 2017 02:05 am
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Jamie Williams
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Richard,

Welcome to the club. I cannot speak "averages", especially when it comes to vintage fans, but I can tell you this. Current NEMA ratings of A, B, F,& H correspond to a temperature rise of 60,80, 105, and 125 C at a 1.0 service factor. Add 10 degrees C for each at 1.15 except for H. And don't forget, heat kills!

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 Posted: Wed Sep 27th, 2017 06:10 am
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Richard Daugird
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"Heat kills" that's from Alfredo!

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