finding RPM of stepper motor

Discussion in 'The Projects Forum' started by venkatesh.n.s, Jul 17, 2014.

  1. venkatesh.n.s

    Thread Starter New Member

    Jul 17, 2014
    1
    0
    Hi this is venkatesh

    how to calculate the speed of stepper motor when the pulse width is known. for a motor of 1600 pulses/revolution and a step angle of 1.8 deg
    what will be the speed if the pulse width supplied is 170 microsecond.
    :):):)
     
  2. ericgibbs

    Senior Member

    Jan 29, 2010
    2,499
    380
    hi ven,

    Assuming 360 deg /revolution and a 1.8deg step thats 200 steps/rev.

    Also assuming a pulse ON period of 170uS and an OFF period of 170uSec.
    Thats 340uS which is a frequency of ~2940 . So 2940/200 = ~15rpm.
    for a two pole stepper.

    Do you have a datasheet for your motor that you could post.?
    E
     
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,771
    1,103
    I'm getting a different answer. If we assume 170uS on/ 170us off, then the time for one rev is 1600 x 340uS = 0.544 sec. So rpm = 60/0.544 = 110.3.

    Edit: What we really need to know is the pulse period, rather than pulse width.
     
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