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OT How important is steel jacket on DC motor?

Discussion in 'Electronic Design' started by John Doe, Oct 30, 2008.

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  1. John Doe

    John Doe Guest

    All of my cordless drill motors have a heavy-duty steel jacket around
    the motor. What's it for? I can live with it, but it's heavy and I'd
    like to remove it for my application. Thanks.
     
  2. John Doe

    John Doe Guest

    That might have saved one of my motors. I just love to remove stuff
    I see as unnecessary.
    I will if this one ends up being overpowered. Given my limited
    design capability, I can't tell yet.
     
  3. kevin93

    kevin93 Guest

    How do you intend to support the magnets, bearing and brushes?

    Usually the outer cylinder has multiple functions, one is to complete
    the magnetic path, another is mechanical to ensure the magnets are
    held with a small air-gap to the armature and also as way of mounting
    the bell-ends that support the brushes and the bearings.

    Sometimes I have seen an additional sleeve that goes over the outside
    to improve the magnetic path - that can be removed without stopping
    operation.

    kevin
     
  4. John Doe

    John Doe Guest

    The motor casing.
    In fact, I was planning to clarify that now just in case John Larkin
    misunderstood what I meant. Whatever you want to call it, to me it
    looks like an extra layer of steel that doesn't completely cover the
    motor casing.
     
  5. John Doe

    John Doe Guest

    You got it, thanks for the picture.
    The motor I have is from a Bosch 36 V hammer drill. The band is more
    than a bit of steel (.05 inches, 1.2 mm, thick), but I would be
    surprised if a brushless motor would be much better for the
    application. They hardly skimp on materials, for example the
    included batteries are exceptionally sturdy 36V two amp hour
    lithium-ion with a 3 LED charge level indicator. The battery charger
    has a fan in it.

    FWIW. That Bosch 36 V hammer drill is being dumped for (USA) $170
    total at the online merchant Tool Authority and a few other places
    on the Internet). It's $575 at Home Depot with tax. I guess Bosch is
    dumping them for a good reason, but I dunno exactly why. Nothing
    obviously wrong with the tool. Great deal IMO if you have the cash
    and need a 36V motor and accessories.
    I don't know about John Larkin, but I'm wondering about taking that
    band off of my DeWalt 36V motor (I vaguely recall doing that). Glad
    I asked before doing that again. Oh well, since I've misplaced the
    band, now I have an excuse (however weak) for not using that DeWalt
    motor.

    Thanks to Kevin for the first correction, I probably should have
    said "additional" or "extra" in my original post.
     
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