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DC motor control

Discussion in 'Sensors and Actuators' started by colum, Oct 10, 2013.

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  1. colum

    colum

    102
    3
    Jul 25, 2013
    Please bear with me with another basic question
    I want to supply 24 to 27v DC to a DC motor (not PM)
    speed is important as it drives a generator

    123v AC line to 24v CT transformer
    28V from transformer

    28v to full wave rectifier 27v out from rectifier

    27v to DC motor

    but suddenly the voltage jumps to 37 DC
    and 40v DC with smoothing capacitor

    I wonder if someone could tell me how to get 27v DC
    from a circuit...Thanks much...colum:confused:
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,389
    2,774
    Jan 21, 2010
    You could use a voltage regulator.

    However if you're driving a motor I wonder why PWM isn't acceptable.
     
  3. colum

    colum

    102
    3
    Jul 25, 2013
    PWM

    Thanks Steve but getting parts for a PWM or any other driver for a 6 amp motor is getting complicated however I did manage to do it with transformers except for the voltage jump and I can not figure out how to solve that.
    I did variac the AC volts going to the 24v transformer to show 27v DC at the output but the variac had to be at 86v AC and thats stretching it.
    There must be a way to stop the feedback (if thats what it is) from the DC windings back into the input.
    I appreciate all of the help I'm getting ...colum
     
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