DC motor Control Progressive Start and Stop

Discussion in 'The Projects Forum' started by Nara Shikamaru, Jul 27, 2008.

  1. Nara Shikamaru

    Thread Starter Active Member

    Nov 24, 2007
    92
    3
    hey Everybody!!.....
    I`m stck with the Control of a DC Motor....I need To Control a DC motor in this way, it Must Start real slowly, and then progressively but slowly should continue to reach its maximun velocity, it could take up to 1 min to reach it; then remain for a set time stable at its final velocity and after the time pass then start to slow down in the same opposite slowly way as the start........how would i do that??
     
  2. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    You need what is called a trapezoidal or s-curve motion controller. You can accomplish this by :

    - writing code to a microcontroller that takes encoder feedback and controls an h-bridge via PWM or linear control
    - using an asic and running it with the pc or a micro
    http://www.national.com/pf/LM/LM629.html
    - analog circuit methods..

    Steve
     
  3. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
  4. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,676
    899
    You might also want to search on "soft-start" for motor controllers for other ideas. John
     
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