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75425 r4 question of spin  Rate Topic 
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 Posted: Tue Feb 11th, 2020 03:46 am
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John Nyman
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This may be a dumb question...the fan came without any wiring so I hardwired the stator to see how it runs and find that among it's many issues, it will run cw or ccw when nudged...otherwise it just sits and hums. It's as if it wants to spin both ways at once...or alternatly ? where to start is my dumb question...

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 Posted: Tue Feb 11th, 2020 04:04 am
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John Nyman
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Don Tener sent me a schematic on wiring the ac-in and how the switch feeds the stator in another thread which I just bumped so it is easily found...and I have #2 and #3 on the stator wired directly to house current and expected it to run...which it does but only when spun by hand and regardless of direction and I'm just a little bum-fuzzled...3 evenings with this fan and I'm getting aggravated...cold beer where are you?

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 Posted: Tue Feb 11th, 2020 10:53 am
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Lane Shirey
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If it has a cap, it’s maybe bad, or, you might have a bad solder joint or broken wire if there’s any part of the old headwire remaining, or it has a bad start coil.  
In any case, it sounds like your start (auxiliary)  coil is not functioning.  

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 Posted: Tue Feb 11th, 2020 10:56 am
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Lane Shirey
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As I reread your post, it seems that you only connected 2 of the 3 wires. All must be connected exactly as the schematic shows.  Otherwise it will operate as you describe and you may damage the stator.  

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 Posted: Thu Feb 13th, 2020 04:54 am
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John Nyman
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Thank you sir! I am still unsure why it should run correctly when wired through the switch but live and learn...thanks again!

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 Posted: Thu Feb 13th, 2020 11:42 am
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Lane Shirey
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These fan motors are of several types. A 3 wire headwire requires a means to shift the phase on the auxiliary coil in the stator. This phase shift is required to give it the directional rotation and directional torque to start.  If the aux coil is non functional for some reason ( broken Headwire, bad cap, burnt out speed coil) then the fan won’t start by itself but it will usually start if spun by hand (either direction) but if you run it this way, you can risk burning out the main stator coil since it doesn’t have the added help from the aux coil.  

The phase shift in the auxiliary (start coil) is created by either putting a capacitor of the right value in the circuit of this coil or using the speed coil to add resistance to this set of coils, depending on how the motor was designed. The capacitance or resistance creates a delay in the sine wave on the aux coil. 

I hope that helps.  

BTW, If your speed coil needs rewound, Rick Huckabee can do that for you.  


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 Posted: Fri Feb 14th, 2020 12:33 am
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John Nyman
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Thanks Lane, that was very helpful indeed...tonight's project should be more productive now. I appreciate it sir!

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 Posted: Fri Feb 14th, 2020 11:53 pm
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Lane Shirey
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:up:

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