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Old 07-18-2011, 02:50 PM   #1
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Doh, Only two wires but the fan runs backwards!

I have a simple toggle switch which was wired in to the back bedroom to run two 12v fans and I just cannot get them to push air out rather than suck it in.... yes, I've switched the wires to the other switch post but there is not change. Now, I'm usually ok with wiring but this is SO simple I can't figure it out. Any comments (good or bad) will be accepted and taken with good humor.
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Old 07-18-2011, 02:53 PM   #2
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Permanent magnet motors will reverse if polarity is reversed (exchange wires going into motor). If the fans are computer type, they're brushless DC motors and cannot generally be reversed unless designed for that.

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Old 07-18-2011, 02:55 PM   #3
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So what you are saying is that, regardless of what I do now, those fans are always going to run backwards?
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Old 07-18-2011, 02:58 PM   #4
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Can you turn the fans around?
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Old 07-18-2011, 03:25 PM   #5
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Cheap $20 fans

Quote:
Originally Posted by barts View Post
Permanent magnet motors will reverse if polarity is reversed (exchange wires going into motor). If the fans are computer type, they're brushless DC motors and cannot generally be reversed unless designed for that.

- Bart
Bart, they're cheap plastic fans. Any suggestions or did you basically state that they're somehow reversed forever.....
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Old 07-18-2011, 03:29 PM   #6
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See this URL it's not that hard.

HOW TO: Wire a DPDT rocker switch for reversing polarity

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Old 07-18-2011, 03:57 PM   #7
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If you have a standard automotive type install the motors are grounded as the return to the battery - so flipping the wires on the motor itself might work... If they are muffin fans, it will have rotation and airflow directions indicated usually by universal language symbols... ←↓ or →↑ etc. (nearly invisible) cast into the plastic housings.
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Old 07-18-2011, 04:05 PM   #8
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you need to return those fans and get some set up for the northern hemispshere. Somewhere in South Africa or Brazil there is a guy with the same complaint....
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Old 07-18-2011, 05:12 PM   #9
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Quote:
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So what you are saying is that, regardless of what I do now, those fans are always going to run backwards?
What kind of fans are these (a picture would help here)?

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