switching device single phase ac motor

Discussion in 'General Electronics Chat' started by dunhillr, Aug 7, 2012.

  1. dunhillr

    Thread Starter New Member

    Aug 7, 2012
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    Hi Everyone,

    I am trying to build a switching circuit (using IGBT or power MosFET) to drive 2 ac motor (230V,1A max) from a micro-controller output (ATmega128) which will be 0-5 V range.

    So, the switching circuit will be acting like an amplifier. Anyone have a sample circuit that i could use?

    Thanks in Advance

    Martin
     
  2. gerty

    AAC Fanatic!

    Aug 30, 2007
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    I would use a triac for this purpose (ac). Are you trying to control the speed of the motor?
     
  3. strantor

    AAC Fanatic!

    Oct 3, 2010
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  4. crutschow

    Expert

    Mar 14, 2008
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    I second strantor's choice (or a similar solid-state relay). You want to have a control circuit that is isolated from the mains, which a simple triac isn't.
     
  5. dunhillr

    Thread Starter New Member

    Aug 7, 2012
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    Yeah, which you have control the input voltage or frequency.....

    But, i need a inverter for frequency so i believe to control voltage would be easier, hence i need a circuit for isolation between the Micro output which is 0-5V DC and IGBT or SCR for the 230V AC side.
     
  6. gerty

    AAC Fanatic!

    Aug 30, 2007
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    For isolation you could use a MOC3010. But for an out of the box solution , you could use strantors solution for an easy installation.
    The MOC 3010 has a sample hook up diagram in its data sheet.
     
  7. strantor

    AAC Fanatic!

    Oct 3, 2010
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    You never directly answered this question:
    But the things that you are saying, are leading me to believe that you ARE. What type of motor is it? Speed control only works with a couple of types of single phase motors, mostly it DOES NOT WORK.
     
  8. dunhillr

    Thread Starter New Member

    Aug 7, 2012
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    It's EC Fans (AC, single phase), i am trying to control the speed of the fan so that i can change the speed when needed.

    I did realized that i will need an inverter for DC to AC conversion,(which changes the frequency) is there any other way i can control the speed without an inverter?
     
  9. strantor

    AAC Fanatic!

    Oct 3, 2010
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    can you give a link to the fan? You probably cannot change the speed via an inverter.
     
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