Understanding motor rotation

Discussion in 'General Electronics Chat' started by CktMeister, Jun 8, 2011.

  1. CktMeister

    Thread Starter New Member

    Jun 8, 2011
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    I am having a problem understanding motor rotation reversal. According to the all about circuits tutorial, swapping any two phases on a three phase motor causes it to reverse direction. I understand how the magnetic fields change so that by the left hand rule the magnetic fields vary in such a way that they either push or pull the rotor in one direction or other.

    My problem is the following:

    According the rule that swapping any two phases on a motor causes it to reverse direction, if I build a motor whose windings are configured to run clockwise when I apply 123 phased power, then it will run counter-clockwise when I apply 213, 321, or 132 power.

    So haven't I also designed a motor that runs counter clockwise when I apply 321 power?

    So then by "the swap any two phase rule", the motor should run clockwise when I apply 123,231,or 312.

    And so if you swap three phases, or any two phases twice, you maintain the same direction-three ways for the motor to run clockwise and three ways counter clockwise?
     
  2. strantor

    AAC Fanatic!

    Oct 3, 2010
    4,302
    1,988
    correct

    correct

    correct

    correct
     
  3. CktMeister

    Thread Starter New Member

    Jun 8, 2011
    2
    0
    Thanks for the sanity check Strantor.
     
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