Power to spinning armature?

Discussion in 'The Projects Forum' started by +crypto, May 25, 2012.

  1. +crypto

    Thread Starter New Member

    Mar 28, 2010
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    Sorry if this is easy to answer, but I honestly have no idea what to google here.

    Say I've got a selection of LEDs on a spinning armature. I want to power them, but the power supply is located on the non-moving base and is not spinning. How do I run the power wires? Is there a sort of collar setup? Do you use brushes, like a motor or generator? Don't know if I'm explaining this the right way. Thanks for any suggestions...
     
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    You would use a slip ring
     
  3. crutschow

    Expert

    Mar 14, 2008
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    The simplest is to use slip rings (two smooth conducting rings with brushes). You might be able to buy what you need from a hobby shop such as this.

    More complex is to use a rotary transformer with the primary winding stationary and the secondary winding on the rotating device to transfer AC power across the gap. The AC is then converted to DC on the armature.
     
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  4. +crypto

    Thread Starter New Member

    Mar 28, 2010
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    EXACTLY what I needed to know. Thanks very much, guys!
     
  5. BMorse

    Senior Member

    Sep 26, 2009
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    check out some of my propeller clocks, which I am sure is what you are doing to see how I did the 2 different ones, you can actually get power from the motors commutator points but that would have to be rectified with a bridge rectifier since it would be alternating DC. http://www.morse-code.com/id44.htm
     
  6. P-MONKE

    Member

    Mar 14, 2012
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    You can use ball-races if friction is an issue.
     
  7. strantor

    AAC Fanatic!

    Oct 3, 2010
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    This is the first time I've ever seen slip rings @ hobbyist prices. Exciting!
     
  8. BMorse

    Senior Member

    Sep 26, 2009
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    Too bad they are made of ABS plastic, and can only spin up to 300 rpm's. Most of my propeller clocks spin a lot faster than that and would melt those things.
     
  9. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    What about holding the shaft fixed, and spinning the motor? Then it acts a generator and you can attach the propeller clock to it.

    Of course that requires another motor and a belt to spin the first motor, but that still sounds easier and more reliable than sliprings.
     
  10. BMorse

    Senior Member

    Sep 26, 2009
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    or we can just skip all the mechanical stuff and go directly to wireless electricity transfer :D

    Witricity1.jpg

    Witricity2.jpg

    Witricity3.jpg

    with a 4011 IC and a few passive components + a couple of coils and you can transfer power to a spinning PCB without any mechanical parts to wear out. :rolleyes:
     
  11. strantor

    AAC Fanatic!

    Oct 3, 2010
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    From the thumbnails I thought you had a tony stark arc reactor there. pretty cool either way..
     
  12. BMorse

    Senior Member

    Sep 26, 2009
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    That actually gives me an idea for my youngest kid's next Halloween costume!:D
     
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