rebuilding electric motors

Grumblegrunt

LE
Book Reviewer
#1
linked in to the washer fault but thought it might get more of a look seperately - I'm wondering if the thermal overload cut out has gone on the washer motor.

as far as I can tell I'm testing it right and getting no reading. so I can drill the rivets out and stick a replacement it there but does anyone have any tips or lookouts on electric motor rebuilding

I am assuming the drilled out rivet/bolts can be replaced with standard ones which lets me get at the bearings as well.
 

Grumblegrunt

LE
Book Reviewer
#3
the thermal overload cut out appears to have gone due to a worn sparky brush so I want to take it apart and replace the toc which appears to be the fuse type rather than a trip one.

I wouldn't bother rewinding such a common thing not but 20 years ago maybe - ebay has a lot to answer for, bearings I will do if they are worn and brushes are external.

I understand that I could bypass it all together with new brushes but would have a potential fire risk if it got that way again.

its riveted probably to save money and claim they are a non servicable part so I am assuming I can bolt it back together like I would any other motor

quite enjoying the research as there's a lot you can do with a washer motor - a friends dad turned a washer motor into a table saw and some yanks use them as generators attatched to lawnmower engines.
 

Grumblegrunt

LE
Book Reviewer
#4
well drilled out the rivets, split the case, found the offending 50p part, tested it properly and ordered a new one :)

I wish I'd found that first but it was only a very small web reference that had me looking.
 
#5
Best of luck with that, but doesn't the fact that it has popped suggest that there's something overheating it?
 

Grumblegrunt

LE
Book Reviewer
#6
^google was my friend in this. 8 year old brushes with one more worn than the other which creates heat. I'd noticed last year that you could see the blue arcing when it was on a spin and the lights were off. it also blew the socket ring when it went on a final high speed spin where it was going at 1500 rpm. so new brishes first ay 7 quid then 8 quid for the toc and 2 quid for some bolts. wire wool the commutator thingy to clean it and away we go. hopefully. it was definately blown though. bearings were still good and nice and chunky - twice the size of the replacements for newer motors going by the spares sites, the ones in there are not far off the ones I use on the bike.

interestingly the motor says 1200 rpm on it.
 

TheIronDuke

ADC
Book Reviewer
#7
What do you mean by rebuild?

Coil rewind, bearings or just brushes!!
Anybody who can answer this may be interested in a 1929 Wico mag I need rewinding. I can send it to the USA to be done but I try not to deal with terrorists who defy their rightful king. Cash waiting but try not to take my eyes out.
 
#8
^google was my friend in this. 8 year old brushes with one more worn than the other which creates heat. I'd noticed last year that you could see the blue arcing when it was on a spin and the lights were off. it also blew the socket ring when it went on a final high speed spin where it was going at 1500 rpm. so new brishes first ay 7 quid then 8 quid for the toc and 2 quid for some bolts. wire wool the commutator thingy to clean it and away we go. hopefully. it was definately blown though. bearings were still good and nice and chunky - twice the size of the replacements for newer motors going by the spares sites, the ones in there are not far off the ones I use on the bike.

interestingly the motor says 1200 rpm on it.
Top man. I did the same many years ago (except I dangerously just removed the failed thermal cutout and bypassed it!!). Still it worked.
 

Grumblegrunt

LE
Book Reviewer
#9
Anybody who can answer this may be interested in a 1929 Wico mag I need rewinding. I can send it to the USA to be done but I try not to deal with terrorists who defy their rightful king. Cash waiting but try not to take my eyes out.
I dont know anywhere around me now but in york I found a place to rewind an oric motor for my mum which cost me about 25 quid back then. anything can be rewound I gather but folks don't bother because they don't realise it's possible.

Wico Magneto Parts

Electric Motor Repairs, armatures, London, Rewinds, Robson and Francis

http://www.ebay.co.uk/sch/Agricultu...&_adv=1&_sop=12&_dmd=1&_nkw=wico&LH_PrefLoc=2
 

Grumblegrunt

LE
Book Reviewer
#10
well now its running and I know where everything is I reckon I can do any more without taking it apart, mind you it was handy to check the motor bearings.
 

TheIronDuke

ADC
Book Reviewer
#11
#12
Get hold of an "Old Bike Mart" There were usually several people doing mag/ dynamo rewinds. Or used to be.
 

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