Need your Advise of using DC Motor

Discussion in 'General Electronics Chat' started by mpcotuong, Sep 22, 2010.

  1. mpcotuong

    Thread Starter Member

    Aug 26, 2010
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    Hi All,

    Does anyone know if I am using the DC Motor one direction for 10sec then go other direction for 10sec. Will DC motor will be damage later on because switch back and forth direction? Please advise.

    Thanks,
    Kevin
     
  2. Jaguarjoe

    Active Member

    Apr 7, 2010
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    If the motor comes to a complete stop before shifting direction you'll be OK.
     
  3. mpcotuong

    Thread Starter Member

    Aug 26, 2010
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    The Motor will turn other direction right away after time out of 10sec. Will it work ok for long run?
     
  4. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    It depends. How much current is the motor drawing during its reverse? How much is it rated for? Is the motor being reversed electrically only or both electrically and mechanically?
     
  5. mpcotuong

    Thread Starter Member

    Aug 26, 2010
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    Yes, both electrically and mechanically. It 's 1A.
     
  6. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    Then there will be bearing stresses and electrical heating created by back EMF. Use a motor designed for 100-200% more power than you are actually using and the stresses won't cause any damage in the long term.

    Why not use stepper/servo motors which are designed for such rapid reversal? :confused:
     
  7. mpcotuong

    Thread Starter Member

    Aug 26, 2010
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    Do you have in mind what model stepper/servo motors I can use? I need it for 9VD to 12VD input.
     
  8. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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  9. mpcotuong

    Thread Starter Member

    Aug 26, 2010
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    The website look good for supply.
     
  10. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    How many hours a day does motor recycle? I would put a 1Ω, 1W resistor in series with motor [12W if allowing for protracted stalls.] Bypass motor & relay contacts with .1 cap. And remember that you can lift & lower arm with a cam without reversing motor.
     
  11. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Reversing small motors with 1 Ω, 5W in series with 12V, 4A supply & DPDT switch:
    M-1 0Ω, 2A no load, 5A loaded; 2 sec to rev, resistor smoking.
    M-2 1Ω, 1A no load, 2A load; 1 sec to rev, resistor hot.
    M-3 13Ω, 50mA no load, 600ma loaded; 1/10 sec to rev, resistor cool.
    M-3 sounds about like motor suggested on prev. post.
     
  12. majsyd2010

    Member

    Aug 29, 2010
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    Very useful Information .... Liked it
     
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