Need help about AC motor speed control.

Discussion in 'The Projects Forum' started by Mussawar, Aug 22, 2012.

  1. Mussawar

    Thread Starter Member

    Oct 17, 2011
    68
    3
    Hi,
    I have to control the speed of two AC motors working in a line. I have to synchronize the speed of both. I have used a formal Diac, Triac type controller (modified version of a fan dimmer with a powerfull triac). It works; but not so good. At low speed motor looses the torque and speed is not constant as the load varies. Can you please give some idea about what kind of circuit should I use? Should I change the frequency, voltage or both? Is PWM would be good idea? Please give a block concept of a good and reliable circuit that work smoothly and fine. It would be batter if some one guide me all this in some sequential steps. What to do first then next and next etc. I‘ll try to rebuild the circuit.
    Some info is: AC 220V, single phase, 4 pole, Aprox 500 watts power, shaft feed back facility is available.
     
  2. Biff383

    Member

    Jun 6, 2012
    49
    19
    I would simply use a couple of VFD's. It works for us.
     
  3. Mussawar

    Thread Starter Member

    Oct 17, 2011
    68
    3
    .
    Yes I can use it but difficult to get/purchase for me. Next I want to build my own.:p
     
  4. cork_ie

    Member

    Oct 8, 2011
    348
    58
  5. Mussawar

    Thread Starter Member

    Oct 17, 2011
    68
    3
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