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anyone help me?

Discussion in 'General Electronics Discussion' started by hoolko, Mar 15, 2015.

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  1. hoolko

    hoolko

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    Mar 14, 2013
    i build lapidary grinding machines with a dc motor of 90v,,,,2.9 amps........i use a 4a 100v bridge rectifier to convert ac to dc and use a standard dimmer switch to adjust motor speed.....id like motor to run a bit smoother,,,,,,need your expertise to add any electronic components for smoother running motor
     
  2. ADRT

    ADRT

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    Nov 25, 2014
    You need a pwm circuit. This would make the motor run smoother than just the dimmer switch.
     
    Last edited by a moderator: Mar 15, 2015
  3. ADRT

    ADRT

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    Nov 25, 2014
  4. ADRT

    ADRT

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    Nov 25, 2014
    You might be able to build one cheaper, but it would take some level of electronics expertise to do so.
     
  5. hoolko

    hoolko

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    Mar 14, 2013
    thanks.....im familiar with this one.......my rectifier is 100v and these cheap pwm's are only 90v....they burn out on me.........i cant find a 90v rectifier...only 50v and 100 v...noting in between
     
    Last edited by a moderator: Mar 15, 2015
  6. hoolko

    hoolko

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    Mar 14, 2013
    thanks so much but they burn out with a 100v rectifier............any suggestions? thanks somuch, Nikki
     
  7. ADRT

    ADRT

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    Nov 25, 2014
    So your coming directly off the house mains to the rectifier? 110vac? Or is there a transformer?
     
  8. ADRT

    ADRT

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    Nov 25, 2014
  9. duke37

    duke37

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    Jan 9, 2011
    If the input is around 120V AC, then I would use a 400V bridge to give a bit of spare capability.

    You could try a resistor such as a 100W bulb at the output of the dimmer to give it a more stable reference voltage.
     
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