Electric motor repair book
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    Default Electric motor repair book

    Something I have been looking into. I found a book that explains how to do your own rewind.

    Electric Motor Repair by Robert Rosenberg

    http://campkahler.com/files/Electric...yQuestions.pdf

    Here is a catalog for supplies.

    https://www.essexbrownell.com/upload...0Catalog-s.pdf
    Last edited by rons; 10-30-2017 at 10:26 AM.

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    I wonder if motor shops even make money on rewinding motors. It's a labor intensive job.

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    Quote Originally Posted by ewlsey View Post
    I wonder if motor shops even make money on rewinding motors. It's a labor intensive job.
    Last time I checked around, maybe two years ago, I was flat told that I could buy a brand new 10hp three phase motor (which is what I was asking about) for less money than they'd have to charge... And I assume he meant from the manufacturer, not e-bay.

    Dennis

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    Quote Originally Posted by ewlsey View Post
    I wonder if motor shops even make money on rewinding motors. It's a labor intensive job.
    Good question. Over 20Kw I'd say they do. It's not only rewinding, it's bearings, shafts, balancing etc. But small power, I doubt it's worth the trouble. I just bought a 4Kw, 4poles, 220/380V for $250 and I didn't think it was cheap. In the same time an experienced rewinder is very quick - quicker than I would dare write here. There will be some margin but not much.

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    Quote Originally Posted by rons View Post
    Something I have been looking into. I found a book that explains how to do your own rewind.

    Electric Motor Repair by Robert Rosenberg

    http://campkahler.com/files/Electric...yQuestions.pdf ...
    What a great book! Thanks for the post.

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    Quote Originally Posted by rons View Post
    Something I have been looking into. I found a book that explains how to do your own rewind.

    Electric Motor Repair by Robert Rosenberg

    http://campkahler.com/files/Electric...yQuestions.pdf

    Here is a catalog for supplies.

    https://www.essexbrownell.com/upload...0Catalog-s.pdf
    Thanks for the supplies link. Didn't know there was such a thing-have been piecing together supplies from various suppliers, so it's nice to have a single place to buy everything.

    The Rosenberg book is copyrighted, BTW. Not sure how CampKahler justifies posting it online. It's a classic and can be had on the used market for $30 or so. Later editions are a LOT pricier.

    https://www.bookfinder.com/search/?a...520controllers

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    Quote Originally Posted by neilho View Post

    The Rosenberg book is copyrighted, BTW. Not sure how CampKahler justifies posting it online.
    There appears to be a second edition, which is not online. If you feel guilt then don't look at the book online and buy a copy.

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    Quote Originally Posted by AlexO View Post
    ..... In the same time an experienced rewinder is very quick - quicker than I would dare write here. There will be some margin but not much.
    In most of those books they show doing up custom coils, so you can assemble just like the factory, prewound coils that are put into the slots. That goes pretty fast, and the winding of coils can be done over nails in a board. In some of the automated factories, putting in the coils takes literally a few seconds.

    Of course, hand placement CAN have better interwinding insulation, and much less issue with corona, the corona voltage may be much higher than any requirements..

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    Quote Originally Posted by rons View Post
    There appears to be a second edition, which is not online. If you feel guilt then don't look at the book online and buy a copy.
    Got a bit of a hair trigger, mister? I don't recall mentioning any personal guilt and don't have any. How about you?

    I have the third edition, bought 25 years ago. It's a fine book.

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    That book is in the time window when the copyright would have expired unless the owner specifically renewed it. Most didn't, but you'd have to check to be sure.

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    Quote Originally Posted by neilho View Post
    Got a bit of a hair trigger, mister? I don't recall mentioning any personal guilt and don't have any. How about you?

    I have the third edition, bought 25 years ago. It's a fine book.
    No trigger just a question. How many expert rewinds have you accomplished in the last 25 years?

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    I had work at a motor rewind shop in the 90's. Just to rewind a simple 3 phase motor with no machine work was $300. I'm talking 5hp or less. A factory can kick out a motor winding in minutes when making hundreds. But a one off repair takes hours. I don't miss the stress of trying to get customers motor repaired in a timely manner. But I do miss the problem solving. We worked on everything from locomotive traction motors to small DC motors. I do wish I'd had taken pictures back then. One of my favorite motors that came in was about 8' tall and 1' deep winding (stator). The rotor coils (windings) were the size of Harley jugs mounted on the shaft (rotor). The motor was only about 250hp at 200rpm. All the connections on the stator windings had been wiped out when the motor over spun rpm. The brake had failed and dropped the load down a 800' deep mine shaft. The customer figured it was spinning at a couple thousand rpm before copper started flying out. One of our retirees came in and re engineered what the connections should be. He loved every minute making all drawings for the connections. It only took two men a month to repair and what fun to watch the test run. Got to love slow HP.

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    The green thing to do is to get the rewind. At least the rewind shop explains it like that.

    A three phase motor has a lot more copper and I would not want to start with one of those. A single phase motor is the place to start.


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