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AFCA Forums > Antique Fan Collectors Association > Pre-1950 (Antique) > converting four blade to six blade

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 Posted: Mon Feb 10th, 2020 04:06 am
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David A Cherry
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Quick question... does the six bladed general electric BMY have more power than the four bladed one?... I was told Westinghouse added power when they added a blade, not sure if  GE did this or not, did they reduce the blade pitch to compensate !... Thanks!...

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 Posted: Mon Feb 10th, 2020 04:34 am
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Steve Stephens
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Most fan companies put their 6 wing blade on a slower turning motor with six instead of four poles.   R&M on their earlier cast iron and drawn steel fans used the same faster turning 4 pole motor but the 6 wing blade had a shallower pitch than most other makers' 6 wing fans.   The size pole motor gave a quieter running fan.   I don't know if there was more power or not but there was usually more "quietness" with a 6 blade on a 6 pole motor.  GE and Westy used a 6 pole motor with their 6 wing blades.

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 Posted: Mon Feb 10th, 2020 06:54 am
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Russ Huber
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Menominee made 6 wing desk fans in order to keep up with the competition. The only problem is Tideman deceived his customers by placing a shallow pitch 6 wing blade on a 4 pole motor. To the best of my knowledge Menominee did not have a 6 pole desk fan. 

If you want a true deeper pitch 6 wing RESIDENCE desk fan it will have a 6 pole motor with a top end of roughly 1150 RPM. Great for family, bedroom, and hospital rooms where quiet operation is important.

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Menominee7.JPG

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 Posted: Mon Feb 10th, 2020 08:12 am
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David A Cherry
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Thanks to all.... it all makes sense, anyone putting a six blade on a four pole motor is making a mistake...I'm now wondering how much strain is being put on 4 pole motors because of aesthetics and ignorance.. i'm sure greed and capitalism are in play with Six blades selling more than four... 

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 Posted: Mon Feb 10th, 2020 12:35 pm
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Kim Frank
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On a GE BMY, check the slots in the stator. 24 slots = 4 pole, 36 slots = 6 pole.

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 Posted: Mon Feb 10th, 2020 02:32 pm
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Jim Kovar
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Steve Stephens wrote:GE and Westy used a 6 pole motor with their 6 wing blades.

:idea   :idea   :idea   :idea   :idea   :idea

So,...  did Emerson use a 
5 pole motor with their
5 wing blades?   :wondering:   :shock:   :P

Last edited on Mon Feb 10th, 2020 02:38 pm by Jim Kovar

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 Posted: Mon Feb 10th, 2020 04:52 pm
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Steve Stephens
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Effects of changing number of blades on a fan motor.

From a 1925 book-






Last edited on Mon Feb 10th, 2020 04:56 pm by Steve Stephens

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 Posted: Mon Feb 10th, 2020 04:55 pm
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Steve Stephens
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 Posted: Mon Feb 10th, 2020 06:45 pm
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David A Cherry
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this is going to be an on going problem, it's probably never going to go away, the end result is burned up windings and the loss of some great fans.

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 Posted: Thu Feb 13th, 2020 11:42 am
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NM Whitney Jr.
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Minor Thread Hijack:

Jim Kovar,
Sleestak profile pic noted...
Sincerely,
Rick Marshall

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