motor speed..rotor or magnetic field ?

Discussion in 'Homework Help' started by TheSpArK505, Aug 29, 2016.

  1. TheSpArK505

    Thread Starter Member

    Sep 25, 2013
    92
    0
    Hello guys, hope you all fine.

    I have a simple question- stupid probably- when it says the speed of the motor is x, is it the speed of the rotor or the speed of the rotating magnetic field ??
     
  2. AlbertHall

    Well-Known Member

    Jun 4, 2014
    1,951
    387
    The speed of the rotor or possibly the speed of the output shaft if the motor has a built-in gearbox. Not all motors have a rotating field.
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,548
    2,373
    The RPM of the rotor shaft, A demonstration of this is a common AC 2 pole induction motor, the field rotates at the line frequency, 60hz in NA, so the field rotates at 60hz x 60sec = 3600rpm, but a common rpm for this motor rotor would be ~ 3470 due to the natural slip frequency.
    Max.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,548
    2,373
    Incidentally where the rotating field and the rotor is the same rpm, these are known as Synchronous motors.
    Max.
     
  5. TheSpArK505

    Thread Starter Member

    Sep 25, 2013
    92
    0
    thank u for the help
     
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