Convert AC Voltage to DC Voltage

Discussion in 'General Electronics Chat' started by clf, May 15, 2006.

  1. clf

    Thread Starter New Member

    May 15, 2006
    4
    0
    I need to convert 115 VAC to VDC to control a small DC motor of 1/29HP load of .030A. I also want to vary the voltage to the motor to control it's speed. I am replacing a failed circuit board that had all kinds of bells and whistles I don't need. I was looking at a power bridge rectifier for the conversion but I don't know what to use for the motor control. Is this the right approach. I also would like to keep the cost down as much as possible
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    Got any idea of the voltage the motor likes to run on? If it's a universal brush motor, it will do AC as well as DC (no speed control). What did the failed board do?
     
  3. clf

    Thread Starter New Member

    May 15, 2006
    4
    0
    The motor has brushes in it. I don't know what a universal brush motor is but I can hook up AC to it and see if it will run. It's a Bodine Type 24A2BEPM. The board was controlled by a timer and without time on the timer the motor would not run. When we try to turn it on the timer led screen goes blank and we can't get the speed control to start the motor. This thing is used in a nasty environment and it's really not worth having the board replaced.
     
  4. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Bodine's website lists five different model numbers for this motor type - 1/29hp:
    Bodine series "24A" motors

    Two of them are 24V at 1.8A, and the other three are 130V at 0.3A. Is the "0.030A" in the first post a typing error?

    Belden has a 130V PWM speed controller for about a hundred bucks. PWM (Pulse Width Modulation) is much better than varying voltage to control motor speed.

    Controller
     
  5. clf

    Thread Starter New Member

    May 15, 2006
    4
    0
    Yes it was a typing error, that is the motor we have. I think I will go with the Belden speed controller. Thanks for your help, much appreciated.
     
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