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Wiper motor running backwards?


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#1 308 Sunbird

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Posted 17 May 2019 - 04:38 PM

G-day all I've got a mystery for all the electrical gurus (which l am not) out there in Torana land.

 

Last year l pulled apart my Preslite wiper motor out of the LX and had the bell and cover plate zinced

and body painted to look like zinc then whacked all back together and it looked and worked a treat.

Then washed the old girl the other day and no wipers. Boo!

Pulled it apart and motor was seized onto the bottom bush. Ok got that all freed up and put it back in but l believe l must have caught one of the brush pig tails which caused a short and blown fuse.

So apart again and more carefully reassembled.

Now for the dilemma- it works beautifully both speeds and parks but runs in the reverse direction?

WTF?

I read that the zincing process can upset the magnets (l didn't remove them) but it did run fine last year when first installed and

no l haven't swapped or even touched any wiring.

Please help or recommend a reputable mob to take a look.

 

Thanks Stuart 

 



#2 S pack

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Posted 17 May 2019 - 06:39 PM

Did you remove the crank lever from the wiper motor?



#3 S pack

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Posted 17 May 2019 - 06:46 PM

Found this in another thread on LH wiper motors.

 

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Posted 18 August 2015 - 02:30 PM

Had the same problem. The wipers park about quarter the way up the winscreen
You will find the motor is running in reverse
To fix. Just undo the main bolts from the motor housing
Rotate the housing 180 degrees and bolt back together. This will get it going in the right direction


#4 dron

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Posted 17 May 2019 - 06:54 PM

The only way it will run the other way is reversing the polarity of the supply. Swaping the brushes/ motor cover 180 would do that



#5 308 Sunbird

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Posted 17 May 2019 - 08:17 PM

Found this in another thread on LH wiper motors.
 



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Posted 18 August 2015 - 02:30 PM
Had the same problem. The wipers park about quarter the way up the winscreen
You will find the motor is running in reverse
To fix. Just undo the main bolts from the motor housing
Rotate the housing 180 degrees and bolt back together. This will get it going in the right direction

Thanks Dave l did read this during my many searches but couldn't see it making any difference. But after your post l thought I would give it go as it is so easy to do and nothing to loose and bugger me it worked don't know how and would love to learn why but very happy. Just need to buy a new decal for this side now.
Thanks for your help mate.


#6 hanra

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Posted 17 May 2019 - 08:44 PM

North and south magnets.

#7 308 Sunbird

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Posted 17 May 2019 - 09:20 PM

Hi Brad l just can't get my head around the fact that it needs to be the other way around to what it was before. Is it possible that when I shorted it that changed their polarity?

#8 Cook

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Posted 18 May 2019 - 08:25 AM

If you reassembled the motor with the arm from the motor in the wrong resting position (180o) would that have the same effect? Cheers Ron

#9 hanra

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Posted 18 May 2019 - 09:27 AM

Was the motor can removed from the motor?

#10 VDO

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Posted 18 May 2019 - 09:43 AM

Found this in another thread on LH wiper motors.

 

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Posted 18 August 2015 - 02:30 PM

Had the same problem. The wipers park about quarter the way up the winscreen
You will find the motor is running in reverse
To fix. Just undo the main bolts from the motor housing
Rotate the housing 180 degrees and bolt back together. This will get it going in the right direction

That won't work as the motor can has a keyway to go in only the one position.



#11 VDO

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Posted 18 May 2019 - 09:55 AM

The problem here is the magnets are in the wrong way around, along with the zincing process weakening one of the magnets more than the other.

 

The stronger magnet will determine the rotation.

 

Magnets can also deplete over time, and not always at the same rate, so they'll differ when Gauss tested.

 

I found this out when I first started doing wiper motors, NEVER leave the magnets in when zinc plating the cover.

 

The poles in the magnets are also oriented in a specific way to work together.

 

Always before I re-fit the magnets, I check the magnet strength of each one (with a Gaussmeter) and if they differ, I re-magnetize them both with a special high output magnetizer to get them both at equal strength.

 

Also, when I remove the magnets I use a paint pen to mark the top positions, and also mark them left and right in relation to how they face the main body so they go back in exactly the same positions as they were removed.

 

Your best bet is to grab a used wiper motor and use the magnets from that, because your current magnets are screwed up.


Edited by VDO, 18 May 2019 - 09:56 AM.


#12 308 Sunbird

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Posted 18 May 2019 - 07:17 PM

Was the motor can removed from the motor?

Yes for zincing but was reassembled the same way and worked. Then as discussed shorted out then reassembled and ran backwards. I did as discribed in the thread Dave pointed out and now it runs powerfully and the correct direction.

The problem here is the magnets are in the wrong way around, along with the zincing process weakening one of the magnets more than the other.
 
The stronger magnet will determine the rotation.
 
Magnets can also deplete over time, and not always at the same rate, so they'll differ when Gauss tested.
 
I found this out when I first started doing wiper motors, NEVER leave the magnets in when zinc plating the cover.
 
The poles in the magnets are also oriented in a specific way to work together.
 
Always before I re-fit the magnets, I check the magnet strength of each one (with a Gaussmeter) and if they differ, I re-magnetize them both with a special high output magnetizer to get them both at equal strength.
 
Also, when I remove the magnets I use a paint pen to mark the top positions, and also mark them left and right in relation to how they face the main body so they go back in exactly the same positions as they were removed.
 
Your best bet is to grab a used wiper motor and use the magnets from that, because your current magnets are screwed up.

Thanks Chris for your relay. I must of got lucky this time. Next time magnets out. The bell cover did have a groove to be positioned 180 around and to my amazement fixed the problem. Thanks to everyone for their help.

#13 Balfizar

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Posted 22 May 2019 - 06:17 PM

Another tip:- never remove the armature from a permanent magnet motor.

If you have to - slide in a steel tube in (of about the same diameter as the armature)as you slide the armature out. This maintains the field effect on the magnets and stops depletion.

This goes for fractional HP DC motors up to large permanent magnet DC motors.    






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