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Snubber Circuit For induction motor

Discussion in 'Power Electronics' started by steve_venkat, Jan 16, 2019.

  1. steve_venkat

    steve_venkat

    31
    0
    May 22, 2017
    Hai,I'm trying to drive an bi-directional induction motor with BT136 triac,but often the TRAIC is blown up.So I tried to use the snubber circuit to avoid this issue.But I'm new to snubber design.

    So please advice is this circuit is corrector have to change the circuit.

    The induction motor is 230VAC operating and consume 1.4A in normal operation.
     

    Attached Files:

  2. Minder

    Minder

    2,774
    575
    Apr 24, 2015
    What type of motor is it, if bi-directional, then I assume it is a PSC motor if induction, if so you would need to swap the start run winding's over to reverse.
    A snubber around 150ohm in series with a .1uf cap for a start might solve the failure problem.
    M.
    .
     
  3. steve_venkat

    steve_venkat

    31
    0
    May 22, 2017
    Can you check the diagram which attached in previous post..Is it correct..?
     
  4. ramussons

    ramussons

    340
    61
    Jun 10, 2014
    The Snubber (with around 150 Ohms and a .05 uF in series) should be Directly Across the Triac. In your schematic shown the Opto is being fed from the tapping of the RC combination.
     
  5. steve_venkat

    steve_venkat

    31
    0
    May 22, 2017
    Is this circuit is ok..?
     

    Attached Files:

  6. ramussons

    ramussons

    340
    61
    Jun 10, 2014
    That should do fine. I would mount the Triac on a small Heat Sink.
     
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