Single phase induction motor

Discussion in 'Homework Help' started by noor069, Nov 28, 2011.

  1. noor069

    Thread Starter New Member

    Oct 1, 2011
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    Hi. I am doing a project in single phase induction motor speed control by analog electronics. could anyone please help me by a circuits. similar like closs loop speed control by an op-amps. Thanks.
     
  2. crutschow

    Expert

    Mar 14, 2008
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    How do you plan on controlling the motor's speed, by changing its voltage or frequency?
     
  3. noor069

    Thread Starter New Member

    Oct 1, 2011
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    Controlling the motor speed by changing its frequency
     
  4. crutschow

    Expert

    Mar 14, 2008
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    Then you want a PID control loop.

    Be aware that designing and tuning such a loop to obtain a stable control system for controlling a motor is not a trivial task.
     
  5. noor069

    Thread Starter New Member

    Oct 1, 2011
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    ok,so is their any way to help me please, do you have any circuit me to get an idea of it. thanks
     
  6. strantor

    AAC Fanatic!

    Oct 3, 2010
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    you are going to have trouble varying the speed of a singe phase induction motor, with any circuit. The capacitor is sized for 60hz. I imagine you will have all kinds of wacky results trying to vary the frequency to it. There's a reason why variable speed motor applications are either DC or 3phase AC.
     
  7. noor069

    Thread Starter New Member

    Oct 1, 2011
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    Thanks for the reply. I understood what you mean. That’s why I Couldn’t find much details about it in internet. But how some domestic single phase motors were controlled the speed.
     
  8. strantor

    AAC Fanatic!

    Oct 3, 2010
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    1,988
    most multi-speed AC home appliances use "universal motors" - basically just a DC series wound motor that works on AC.
    check this out:
     
  9. noor069

    Thread Starter New Member

    Oct 1, 2011
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    Thanks for the all information’s.
     
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