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How to drive a 115V 20A DC brushed motor with DC supply

  1. Jan 31, 2015 #1
    I am trying to drive a 115V DC brushed motor with a DC power supply. Most drivers I've found are for AC to DC and the 115V supply seems to be to much for most DC to DC.
    Has anybody worked with driving motors with large DC power supplies? Or does anybody now where I might find one?

    Thanks

    The motor & driver specs are:

    115V
    20 A (driver should be 30A+ for current spikes)
    3.5 HP
     
  2. jcsd
  3. Jan 31, 2015 #2

    jim hardy

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    2016 Award

    you can use a bridge rectifier if you're careful
    but
    be aware your motor windings must not be internally tied to the frame unless you use an isolating transformer.

    a motor can draw several times rated current during start.

    so i'd consider even this 35 amp bridge skimpy
    though i've used them on 2hp motors...yours is almost twice that...
    http://www.newark.com/fairchild-semiconductor/gbpc3506/bridge-rectifier-35a-600v-gbpc/dp/58K8890

    at only $3 you can afford to destroy one
    http://www.newark.com/productimages/standard/en_US/4076477.jpg





    I'd look for something like this 80 amp
    http://www.newark.com/nte-electronics/nte5346/bridge-rectifier-single-phase/dp/31C4719
    datasheet
    http://www.nteinc.com/specs/5300to5399/pdf/nte5346_48.pdf
    http://www.newark.com/productimages/standard/en_US/5060871.jpg



    be aware your motor windings must not be internally tied to the frame unless you use an isolating transformer.
     
    Last edited: Jan 31, 2015
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