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AFCA Forums > Antique Fan Collectors Association > Pre-1950 (Antique) > Unique method of speed control...

Unique method of speed control...
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Nicholas Denney
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 Posted: Thu Aug 7th, 2008 06:35 pm
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I have been thinking awile about motors, poles, coils and whatnot and I thought - "Have any motors or fans been wired so that different speeds are obtained by using different numbers of poles?" For example, a stator with room for 8 poles could also have 4 separately wound poles for medium speed and another 2 separately wound poles for high speed. Excuse me if such motors already exist, I just thought I had come across something new. :hammer:

Attached Image (viewed 246 times):

polediagram.jpg
Rob Duffy
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 Posted: Thu Aug 7th, 2008 06:45 pm
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That might indeed be possible.
Dave Rouse
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 Posted: Thu Aug 7th, 2008 06:49 pm
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I don't know the details, but I believe Westinghouse 'Tesla' fans use something similar. There are no coils or resistor windings on the switch, and I had my 133 cycle Tesla's switch wired so that it runs on 60 cycle current at about 1/2 speed.

Also, it might be that Emerson tripods like the one Ron Jeter just posted pics of have something similar.  I seem to remember there was a boatload of wires coming off the switch with no speed coil when I last looked inside of one.

 
Nicholas Denney
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 Posted: Thu Aug 7th, 2008 06:52 pm
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Rob Duffy wrote:
That might indeed be possible.
Of course it is! Only barrier might be the fact that every time you halve the number of coils, you have to double the number of turns in each coil so that you have equal load-carrying ability. For example, if each Lo speed pole had 500 turns, each Med speed pole would need 1000 and each Hi speed pole would need 2000.

Last edited on Thu Aug 7th, 2008 07:22 pm by Nicholas Denney
Steve Stephens
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 Posted: Thu Aug 7th, 2008 06:55 pm
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Dave Rouse wrote:
I don't know the details, but I believe Westinghouse 'Tesla' fans use something similar. There are no coils or resistor windings on the switch, and I had my 133 cycle Tesla's switch wired so that it runs on 60 cycle current at about 1/2 speed.


 

I was told something similar about the Westinghouse Tesla. Two sets of poles placed in series or parallel to change the speed. Not being to knowledgeable about motors and windings I'll have to leave it at that.
Nicholas Denney
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 Posted: Thu Aug 7th, 2008 07:10 pm
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Steve Stephens wrote: I was told something similar about the Westinghouse Tesla. Two sets of poles placed in series or parallel to change the speed. Not being to knowledgeable about motors and windings I'll have to leave it at that.
The Tesla? No surprises there! :D
Russ Huber
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 Posted: Thu Aug 7th, 2008 07:23 pm
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Dave Rouse wrote: I don't know the details, but I believe Westinghouse 'Tesla' fans use something similar. There are no coils or resistor windings on the switch, and I had my 133 cycle Tesla's switch wired so that it runs on 60 cycle current at about 1/2 speed. 
 


http://www.google.com/patents?id=9bVwAAAAEBAJ&dq=445207

http://www.google.com/patents?id=foRdAAAAEBAJ&dq=534151  :up:
Steve Stephens
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 Posted: Thu Aug 7th, 2008 08:24 pm
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Some brilliant inventors there Russ. I think I follow their invention (somewhat).
Nicholas Denney
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 Posted: Fri Aug 8th, 2008 02:36 am
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Here is another design I came up with - a monopolar motor with a commutator, its speed controlled only by the AC input frequency. Would it work?? 

Ok...ok, I admit it. I'm just bored. :hammer:

Attached Image (viewed 184 times):

monopoleAC.jpg
Steve Cunningham
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 Posted: Fri Aug 8th, 2008 03:05 am
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GE used phase wound motors ca 1909-1912. Different speeds on the switch would activate different windings in the stator. The stators also has resistance wire in the them.
Evan Atkinson
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 Posted: Fri Aug 8th, 2008 07:25 am
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You ask a lot of good questions that I think I've wondered about at one time or another, just never did find the right way to ask them. If that's your "bored" I must look really bad when I'm truly BORED.
Dale Keever
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 Posted: Sat Aug 9th, 2008 03:25 pm
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I believe Steve is correct, I have a mid teens GE 16" with 4 head wires and no speed choke and it runs on 3 speeds.  After running for a while it gets HOT so could this be due to resistance wiring in the stator?
Rick Hill
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 Posted: Sat Aug 9th, 2008 03:57 pm
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As stated in earlier posts, the Westinghouse Tesla fans used this method of combining poles to reduce speed.  This carried on into the "pancake" Westinghouse model.  I also believe the '97 "Meston-like" Emerson (silver) used a switching design where one or more poles were taken off-line to slow the motor.

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