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Help with motor rewiring

tiggi

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I came up with this brilliant idea of cleaning and rewiring an old Crafstman motor without doing all the proper planing, so now I don't know how to put it all back. Motor is Crafstman 1/2 HP capacitor motor (cr220k21) and it is very dirty, old and rusty. So I took out the wiring that going into the stator and now I am confused which one goes where. I would normally do trial-and-error but with motor one error would be one too many. So instead of taking chances I beg for your help. Here are some pics with old and new wiring.
Thanks
 

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A_Pmech

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I'm not sure I would bother salvaging that motor, unless by salvaging you mean a full rewind.
 

A_Pmech

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The windings look to be in poor condition, with a fair amount of varnish flaked off.
 
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tiggi

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So what are my options here? Is there anyone that rewinds stators these days? Would this be something that can I could do? Is it possible to buy a new stator that would fit this motor? Can the windings be re-varnished?
 

G_P

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Its cheaper to buy a new motor than it will be to have that one rewound.

Since you cut off the old wires and replaced them, its going to be difficult to figure out what was what. You may have to scrap this one and write it off as a lesson to label all wiring in the future.
 

wyliesdiesels

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If the varnish is missing u will need to have it redipped!

I would scrap it for cash and get another motor. Cheaper...
 
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A_Pmech

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So what are my options here? Is there anyone that rewinds stators these days? Would this be something that can I could do? Is it possible to buy a new stator that would fit this motor? Can the windings be re-varnished?

You can do it at home if you're so inclined, although the job isn't profitable by any stretch of the imagination on a motor like that. It can be fun though. Winding isn't a particularly difficult job. However, some special materials are required.

Re-varnishing a motor with failing wire insulation won't generally increase the life of the windings.
 
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tiggi

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I've tried looked on google for some resources on replacing the windings but didn't find much. Are you aware of any?
I would like to salvage this old motor. It's not about profit, but keeping something alive that has been around for over 60 years already

You can do it at home if you're so inclined, although the job isn't profitable by any stretch of the imagination on a motor like that. It can be fun though. Winding isn't a particularly difficult job. However, some special materials are required.

Re-varnishing a motor with failing wire insulation won't generally increase the life of the windings.
 

G_P

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http://ivanbennett.com/forum/index.php?topic=8.0

This looks to be a decent how to of winding a motor.

If you really want to save it, just bring it to a motor shop. They will be able to tell you if its worth saving and if it is, what wires go where. If the windings are bad, they can give you an idea of what it will cost to have it rewound.
 

A_Pmech

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I've tried looked on google for some resources on replacing the windings but didn't find much. Are you aware of any?
I would like to salvage this old motor. It's not about profit, but keeping something alive that has been around for over 60 years already

I can understand that. I've done a few motors just for the fun of it.

The best book available on electric motor repair that I'm aware of is "Electric Motor Repair" by Robert Rosenberg and August Hand.

Many of the supplies you'll require, such as the right magnet wire, varnish, lead wire, etc. are available from ebay, McMaster and other suppliers. Electric motor rewind shops will also sell materials, such as slot insulation, if you ask nicely. The couple of electric motor rewind shop suppliers I'm aware of sell only in large quantities.

The first hurdle you'll have to jump is stripping out the old windings. This can be accomplished with a bucket of methylene chloride paint stripper. Simply immerse the core in the bucket for several hours, then thoroughly rinse the core and start clipping. It's a tiring process.

Clean the core with a non-conductive abrasive, such as walnut shells.

The slot insulation, such as Mylar Dacron Mylar is easily cut with a good quality paper cutter.

Your next hurdle will be winding the coils. I built a coil winder to handle the task, but a wooden form will work just as well!

uselectool1_zps843f1884.jpg


Once the coils and phase paper are in, you're ready to add the leads, lace it up and dip it.

wound_zpsa6cf81c9.jpg


There are many catalyzed insulations available today which do not require post-baking.

In the end, it's a lot of work and more expensive than buying a new motor. However, you'll learn a new (and dying) skill which very few people today understand.
 
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tiggi

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G_P and A_Pmech,

Thank you for your help. This is definitely something I would like to try. I might have some more questions down the road but for now I have good direction.
Thanks
 

nehog

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I too have rewound motors, it can be fun, but never cost effective. I did it years ago, baked them as the new stuff wasn't invented yet.
 
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