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Direct current in electric motors?

  1. Dec 21, 2011 #1
    1. Small electric motors with only one armature loop sometimes get stuck. They can be started again by giving the armature a small twist. Looking at the diagram below, what might be the explanation for the motor not being able to start on its own?
    bOIVO.jpg

    When the brush(es) reaches the split within the ring, current ceases to flow. This lack of electricty will stop the split ring commutator and evidently, the motor. Since no current can be transmitted, the motor can't start on its own. However, giving the armature a small twist will close the circuit allowing the motor to operate.

    Please help! I'm not really understanding the principles of motors. I'm taking shots in the dark in answering my questions.
     
    Last edited: Dec 21, 2011
  2. jcsd
  3. Dec 21, 2011 #2

    berkeman

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    Staff: Mentor

    Your answer is fine. Can you think of some things that could be done to minimize this problem with DC brushed motors?
     
  4. Dec 21, 2011 #3
    The problem can be minimize by using more than one armature
     
  5. Dec 21, 2011 #4

    berkeman

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    Staff: Mentor

    Good answer! :smile:
     
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