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Determine Direction of Rotation  Rate Topic 
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 Posted: Sun May 17th, 2020 12:43 pm
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Mark Olson
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Those of you who have put a fan back together only to discover that it runs backwards may appreciate this trick.

Suspend a non-ferrous cylinder in the stator while bringing the power up with a variac and the cylinder will
rotate. That is the direction that the fan will turn if assembled with the stator installed with the top to the front.
Turn the stator if the direction of rotation is incorrect.


I got this tip from an old motor repair book and I do this procedure every time I re-assemble a rewound fan.

Here is a photo of the book description.




Last edited on Sun May 17th, 2020 12:45 pm by Mark Olson

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 Posted: Sun May 17th, 2020 04:51 pm
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Tom Newcity
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I do this same test on my rewound stators with an aluminum diet Pepsi can.  (Dr. Pepper does not work.)   Sidney Lamb showed that to me a few years ago.  Really like your old magazine article.  

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 Posted: Sun May 17th, 2020 04:52 pm
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Rod Rogers
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The aluminum cover from an old florescent starter also works very well. Punch a tiny hole in the top for a piece of string.

~Sparky~

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 Posted: Sun May 17th, 2020 06:04 pm
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Jim Kovar
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Hi, Mark.

That's a neat trick!
I've used it a few times.

:pissed  Cussed when I didn't,...  'cuz I
had a backwards running motor!

From a Coyne book, I think?   :wondering:
Have it here, somewhere.

Does anyone have one of these?

youtube.com/rotating-mag-field-direction-indicator



A neat little key ring fob.

I recall seeing something similar
years ago.  They were give-aways at
an industrial product trade show.

Wish I had grabbed a handful!   :?

Last edited on Sun May 17th, 2020 08:16 pm by Jim Kovar

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 Posted: Sun May 17th, 2020 06:39 pm
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Jim Kovar
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 Posted: Sun May 17th, 2020 06:51 pm
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Jim Kovar
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Amazingly they have re-invented
the magnetic compass!

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 Posted: Tue May 19th, 2020 01:04 pm
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David Hoatson
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If the motor is a shaded pole, like the GE Pancake and small modern fans,

the direction can be determined by the position of the copper pole shades. 







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 Posted: Tue May 19th, 2020 05:46 pm
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Greg Mangin
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I could have used this trick last week.  Had to reverse a stator I had wound.  Thanks, I'll keep it handy for the next one. Good tip on the shaded pole too !!




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 Posted: Tue May 19th, 2020 07:12 pm
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Jim Kovar
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With a split phase motor, you'll need to
short (alligator jumper) the centrifugal
switch so both the run and the start
windings will be energized.

Run windings only,...
                         no rotating magnetic field.

With a variac, bring up the voltage from
zero until your "tester" rotates.

Line voltage applied too long on the
start winding will smoke it.



Last edited on Tue May 19th, 2020 07:35 pm by Jim Kovar

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 Posted: Tue May 19th, 2020 07:26 pm
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David Hoatson
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I’ve seen a soda can impaled with a pencil spin. 

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 Posted: Tue May 19th, 2020 07:32 pm
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Jim Kovar
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 Posted: Tue May 19th, 2020 08:20 pm
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Mark Olson
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I recently revisited "Teslas's Egg of Columbus" with visions of reproducing one...
So many projects, so little time (and energy, and money) :?

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