RichardK
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| posted on 29/3/11 at 08:14 PM |
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Reversing a motor
My 1/4hp pillar drill motor is getting a little tired and I saw another on a market which was 1/2hp and looked as though it would fit ok.
Money changed hands only to find the bugger goes the wrong way, thought it'd be easy to reverse it but seems not...
Here are some hi res pictures, any ideas on how I can make it go the other way??
Linky to hi res picture folder
Cheers gang
Rich
XX
Gallery updated 11/01/2011
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RichardK
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| posted on 29/3/11 at 08:17 PM |
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1 & 3 come out of the starter cap
3 & 4 go to some sort of disengement device presumably for the starter windings
5 & 6 AC in
Thought numbering may help!
Gallery updated 11/01/2011
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coozer
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| posted on 29/3/11 at 08:18 PM |
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Want mine? JUST! took it off the bench as I tried using a 20mm milling cutter in it on some steel and the bearings are fobarred now
Chuck (newer bigger) wanders all ower the joint, currently only any use for a wire brush but if its any good to ya, have it!
1972 V8 Jago
1980 Z750
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RichardK
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| posted on 29/3/11 at 08:24 PM |
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aye I'll have the motor if thats going, cheers mate, does it come with any warranty You can have this one as it wont matter for wire
brushing!!
Cheers buddy
R
Gallery updated 11/01/2011
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Mr Whippy
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| posted on 29/3/11 at 08:24 PM |
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a long shot or just plain rubbish but can you fit that part upside down? I have it in my mind that it may run backwards, scary that I did my own house
wiring and don't even know
Fame is when your old car is plastered all over the internet
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RichardK
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| posted on 29/3/11 at 08:31 PM |
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I like your thinking but its got a cover that goes over the top of the drill at that wouldn't fit.
Nice thinking though
R
Gallery updated 11/01/2011
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coozer
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| posted on 29/3/11 at 08:44 PM |
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How bigs 1/4hp? Mines a 500w. Is that the same? Just needs new bearings I reckon.
1972 V8 Jago
1980 Z750
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fazerruss
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| posted on 29/3/11 at 09:25 PM |
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ey up big slag being meaning to tell you there is another way of reversing the motor. Now its in bits swap the bearing flanges around along with the
armeture in other words the output shaft will be sticking out of what used to be the arse end of the motor.
The theory is that the rear end of the armeture is effectively turning in the opposite direction to the shaft (output) and by swapping it around the
magnetic field remains the same but the drive is taken off the back of the motor.
"if assholes could fly this place would be an airport"
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RichardK
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| posted on 29/3/11 at 09:36 PM |
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Mmmm, I now wish I could remember which way it came apart now
Cheers you daft tart
R
Gallery updated 11/01/2011
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coozer
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| posted on 29/3/11 at 11:07 PM |
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What about swapping the wires in the plug? Neutral on the live etc.. rubber gloves and standing WELLLLLLLLLLL back....
1972 V8 Jago
1980 Z750
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MikeRJ
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| posted on 29/3/11 at 11:34 PM |
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You can reverse the direction of a capacitor start induction motor by swapping the polarity of the starting coil. You need to track down the end of
the coil to do this, one end is most likely labelled '1' in your picture, the other end will be connected to one of the AC in wires.
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daviep
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| posted on 30/3/11 at 07:21 AM |
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As per Mike - looks like wires #1 and #4 but better stick a meter on them and check that they are either end of the same coil.
Davie
“A truly great library contains something in it to offend everyone.”
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big-vee-twin
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| posted on 30/3/11 at 07:30 AM |
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Here's a link to a basic drawing sometimes the capacitor is a resistor.
The start winding is the one connected to the 'disconnecting contact' when the motor has started it usually disconnects using centrifugal
force.
If you reverse these connections on the winding the motor will start in the opposite
direction.link
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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RichardK
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| posted on 3/4/11 at 12:40 PM |
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fazerruss, go to the top of the class, eventually when the penny dropped as to what you meant, I just needed to lenthen the wires of the centrafugal
switch thing and reassemble arse about tit.
Works a treat. cheers
Rich
Gallery updated 11/01/2011
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Thurbs
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| posted on 3/4/11 at 03:41 PM |
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Some of advice on here is scary !!!!!!!
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David Jenkins
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| posted on 3/4/11 at 03:44 PM |
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I know what you mean! 
What surprises me is that on every single-phase motor I've ever worked on there's been some form of terminal block that allows you to
reverse the starting winding. Maybe I've led a sheltered life, but I wouldn't expect to go digging for wires!
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MikeRJ
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| posted on 3/4/11 at 08:52 PM |
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quote:
Originally posted by Thurbs
Some of advice on here is scary !!!!!!!
Scary good or scary bad?
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RichardK
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| posted on 3/4/11 at 09:07 PM |
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quote:
Originally posted by David Jenkins
I know what you mean!
What surprises me is that on every single-phase motor I've ever worked on there's been some form of terminal block that allows you to
reverse the starting winding. Maybe I've led a sheltered life, but I wouldn't expect to go digging for wires!
I know what you mean, which I why I happily paid the man at the car boot 10 earth pounds for the said motor, have since found out that, that
particular motor was off a big reciprocating saw so maybe thats why they never made the motor reversible??
Dunno, at least I was sensible enough to ignore the posts that were potentially going to kill me
Cheers
Rich
Gallery updated 11/01/2011
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