[New to circuits] Need information on TRIAC

Discussion in 'General Electronics Chat' started by suneelmekala, Nov 21, 2011.

  1. suneelmekala

    Thread Starter New Member

    Nov 21, 2011
    3
    0
    I wanted to build a AC motor controller using a TRIAC. I have a small AC 220V, 20 RPM motor (I do not have the specification of this motor).
    And I have BTA12-600B ST make TRIAC (12 Amps, 600V). Here is the specification of the TRIAC (http://www.datasheetcatalog.org/datasheets2/10/109542_1.pdf)

    Can I use this TRIAC to control this motor ?

    Any help is highly appreciated.

    Thank you,
    Sun
     
  2. Adjuster

    Well-Known Member

    Dec 26, 2010
    2,147
    300
    Some motors with defined low shaft speeds are basically geared down synchronous motors.

    If you have one of those, its speed cannot be adjusted by an ordinary TRIAC phase-angle controller.
     
  3. suneelmekala

    Thread Starter New Member

    Nov 21, 2011
    3
    0
    Thanks Adjuster for the quick reply.

    I am not trying to control the speed, I am trying to do simple On and Off control using the TRIAC.

    I am afraid of burning the motor or the TRIAC.


    Thank you,
    Sun.
     
  4. jimkeith

    Active Member

    Oct 26, 2011
    539
    99
    There is little danger of damaging the motor or triac in this case.
    A bigger issue is keeping it latched on as the motor current may be close to the triac holding current--this may require continuous gate current rather than a short gate pulse. Also put a R-C snubber circuit (e.g 150Ω 0.1uf) across the triac.
     
  5. suneelmekala

    Thread Starter New Member

    Nov 21, 2011
    3
    0
    Thanks jimkeith for the reply...

    I am planning to do exactly as shown in the attached circuit.gif. Will it bomb or will it work :confused:

    I am going to pull up the Microcontroller's I/O pin to high till I want the motor running.

    Any thoughts are highly appreciated.

    Thank you,
    Sun.
     
Loading...