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How to build snubber...??

Discussion in 'General Electronics Chat' started by RRITESH KAKKAR, Jan 15, 2012.

  1. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
    2,823
    91
    Hello everyone,

    I need help in building snubber circuit for PMDC motor which sparks very much at low freq ......
    The motor was running at 24V ~~2Amps.
     
  2. shortbus

    Expert

    Sep 30, 2009
    6,878
    4,052
    It sparks because you are running the controller at too low of a frequency. The normal frequency for PWM of a DC motor is in the 20,000 Hz range. You very the speed by changing the 'duty cycle'(time on), NOT the switching frequency.
     
    RRITESH KAKKAR likes this.
  3. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
    2,823
    91
    OK, I will try it.
    But do you think is there any need of snubber just for safety and saving power..!!
     
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