DC Soft Start

Discussion in 'The Projects Forum' started by C_1, Apr 3, 2013.

  1. C_1

    Thread Starter New Member

    Mar 26, 2013
    1
    0
    Hello,

    I am looking to implement a "soft start" solution on a DC starting motor and I am running out of ideas. The motor itself is capable of drawing a maximum 2000A @ 70VDC (very short period of time mind you), and therefore I am limited to the components that I can use. I originally thought an IGBT with PWM might work but cannot find much information on controlling the power in a smooth manner (to essentially limit the in rush current).

    Any ideas?

    Thanks!!
     
  2. #12

    Expert

    Nov 30, 2010
    16,343
    6,828
    Do you know what an inrush current limiter is? This page doesn't have any 2000 amp devices, but it has educational use.
     
  3. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    It's a good idea to have a max current limit (constant current limit) on the DC motor driver.

    That limits startup current and torque perfectly, and also puts a max limit on peak load and fault torques etc.
     
  4. strantor

    AAC Fanatic!

    Oct 3, 2010
    4,302
    1,988
    What are you playing with; an electric locomotive traction motor?

    For a guy who has a motor this big and seems to know very little about circuits which might control it, I would recommend you go with a commercial DC drive.

    Bardac is my DC drive of preference, and they make drives up to 2000HP.

    http://www.bardac.com/pages/products/dc_drives.html
     
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