Dc motors in a hardrive

Discussion in 'Homework Help' started by wholepeeled, Jun 10, 2015.

  1. wholepeeled

    Thread Starter New Member

    Jun 10, 2015
    1
    0
    Why do brush less dc motors have a rotor on the outside and a stater in the inside when they are in a computer hardrive?
     
  2. #12

    Expert

    Nov 30, 2010
    16,257
    6,757
    Because you can get more torque out of a given amount of magnetic field by applying the force to the edge of the rotating disk farther away from the center.

    How you arrange the rotor and stator is irrelevant from some points of view. That is demonstrated by the myriad ways that motors are designed.

    Oops. This is the Homework Forum. I should not have just handed out the answer.
    I hope you learned something.
     
    wholepeeled likes this.
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,509
    2,369
    This method of 'Outrunner' is uses in RC BLDC motors and the Fischer-Paykel motor in washing machines.
    Max.
     
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