Question about vibration motor circuit

Discussion in 'General Electronics Chat' started by yuvi1, Feb 17, 2014.

  1. yuvi1

    Thread Starter Member

    Feb 1, 2013
    37
    0
    hi all,

    i have 2 questions about this circuit that i took from this page :
    http://www.precisionmicrodrives.com...discrete-driver-circuits-for-vibration-motors


    if i read this circuit correctly , i see that it drives a vibrator motor (of a cellular phone) with a PWM signal and a dc voltage , so my question is , why the PWM signal cannot drive the motor itself ? it's because it doesn't have anough current to drive the motor ? and my second question is, why is it wrong to drive the motor just with the dc voltage (without a pwm signal) ?

    thank !
     
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    a lot of those motors are burshless motors, and will not work on dc alone.
     
  3. shortbus

    AAC Fanatic!

    Sep 30, 2009
    4,013
    1,531
    The PWM allows you to control the speed/intensity of the motor. And since PWM is usually a "signal level" used to switch a "power level" voltage it may not be a high enough level to run the motor.
     
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