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Forum Index : Electronics : wiper motor torque

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irishron40
Senior Member

Joined: 22/09/2014
Location: Ireland
Posts: 246
Posted: 07:54pm 29 Nov 2019
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does a wiper motor have more torque in forward or in reverse direction.

thanks .

ron
 
Warpspeed
Guru

Joined: 09/08/2007
Location: Australia
Posts: 4406
Posted: 08:21pm 29 Nov 2019
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Should not make any difference to torque.
There are two basic issues running a wiper motor in reverse.

There is usually a worm gear on the motor that drives a larger spur gear. When run in reverse the worm gear tries to screw itself in the opposite direction, and that produces an end thrust that the motor bearings were never designed to take.

It will work for a while, but if its heavily loaded the bearings may fail after a short time.
The other problem has to do with the self park contacts. The motor and wiper blades will usually stop in a rather strange position if the motor is run backwards.
Cheers,  Tony.
 
johnmc
Senior Member

Joined: 21/01/2011
Location: Australia
Posts: 282
Posted: 10:56pm 29 Nov 2019
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Auto windscreen motors are designed to run in one direction  as quoted by Warpspeed.

The problem is that the axial thrust  is taken by nylon thrust cones, at each end of the armature shaft (preslite wiper motors).

To over come this problem, the nylon thrust can be replaced with a hardened steal ball,
from memory 5mm dia.

Many years ago we used worm drive wiper motor for magnetic profile gas cutters, which had to be able to run both ways with equal torque.

Cheers john
johnmc
 
renewableMark

Guru

Joined: 09/12/2017
Location: Australia
Posts: 1678
Posted: 11:18pm 29 Nov 2019
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I used a wiper motor for a project and found it din't have enough power.
Ended up using something like this
Bloody hell that thing has some serious grunt.
Cheers Caveman Mark
Off grid eastern Melb
 
Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 4406
Posted: 11:25pm 29 Nov 2019
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There are plenty of much better geared motors around than wiper motors.
How about a cordless drill motor and gearbox ?
At least it will have proper bearings.
Cheers,  Tony.
 
irishron40
Senior Member

Joined: 22/09/2014
Location: Ireland
Posts: 246
Posted: 05:10am 30 Nov 2019
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ok. thanks for the replies.  the reason i have it reverse is to keep the nut tightend all the time. in forward is kept loosing the nut
 
Boppa
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Joined: 08/11/2016
Location: Australia
Posts: 814
Posted: 05:58am 30 Nov 2019
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Another issue is that most wipers use an offset brush for the low speed setting, and if you try and run it in reverse using that low speed setting-bad things happens...
(let's sit down and have a smoke' type bad things)
 
renewableMark

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Joined: 09/12/2017
Location: Australia
Posts: 1678
Posted: 10:04am 30 Nov 2019
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well, just get the thread nice and clean and put some thread lock on it, or bugger up the thread with a punch so it can't come loose, or give it a zap with a welder.
Or if you have lots of time on your hands, drill the shaft and put in a split pin.
Edited 2019-12-01 08:06 by renewableMark
Cheers Caveman Mark
Off grid eastern Melb
 
irishron40
Senior Member

Joined: 22/09/2014
Location: Ireland
Posts: 246
Posted: 06:15pm 01 Dec 2019
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thanks everyone. motor I had must have been old as little torque. replaced it and welded  coupling onto the shaft. all working the way it should. thx again.   merry xmass to you all.

ron
 
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