Building a unique motor, first time!

Discussion in 'The Projects Forum' started by blurrycustoms, Sep 12, 2008.

  1. blurrycustoms

    Thread Starter New Member

    Sep 11, 2008
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    I'm new here, and I'm looking to build a motor, of the brushless dc sort, and am looking for some direction. Also, if you all don't mind, I would like to document my progress here!

    Here are my requirements:

    -DC brushless
    -18" outer diameter, 4" wide, and 16" inner diameter <-----yes, inner diameter
    -output 30 hp

    I am beginning with a lot of research, so bear with me. Any suggestions on where to start?
     
  2. mik3

    Senior Member

    Feb 4, 2008
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  3. blurrycustoms

    Thread Starter New Member

    Sep 11, 2008
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    that is a cool link, thanks. Has anyone ever seen a motor like this attempted before. With such a large inner diameter?
     
  4. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    You might look for info on "pancake motor" design, since your dimension specs fit that description.

    Ken
     
  5. blurrycustoms

    Thread Starter New Member

    Sep 11, 2008
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    Yeah, I had been looking into that, that is probably where I'll end up.
     
  6. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Here is another interesting Yahoo group to check out.

    One decision you will have to make is whether you want an out-runner or normal configuration.

    John
     
  7. blurrycustoms

    Thread Starter New Member

    Sep 11, 2008
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    Just a quick rendering of the stator, to give you guys an idea of what I'm thinking.

    [​IMG]

    Comments?
     
  8. blurrycustoms

    Thread Starter New Member

    Sep 11, 2008
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    Anybody see any major issues? Personally I think it's far fetched, but those are the kind of projects that I like!
     
  9. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    I agree, it is far fetched for a first project.

    As for "issues," machining the stator laminates will be one. Another will be finding shaped magnets for the field, assuming it is going to be a PM out-runner.

    John
     
  10. blurrycustoms

    Thread Starter New Member

    Sep 11, 2008
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    Yes, PM out runner. I was planning on having the stators and insulators water jet cut. I may try a small version as a test run.
     
  11. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Here's a commercial version, Predator. Could not find a price. Power is given as 15 to 20 HP at various places.

    View attachment 4435


    From the size you are proposing, is it possible you are thinking of incorporating it into the wheel of a vehicle? If so, be sure to consider the gyroscopic effects of such a large un-sprung mass, particularly if on the steering wheels. Some of the old rotary Gnome engines in aircraft produced some nasty effects.

    John
     
  12. blurrycustoms

    Thread Starter New Member

    Sep 11, 2008
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    The wheel idea is cool:), but it's actually for industrial use. Still researching and designing!
     
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