75V DC power supply from 230V AC

Discussion in 'The Projects Forum' started by krissotrent, Jan 28, 2019.

  1. krissotrent

    Thread Starter New Member

    Jan 28, 2019
    1
    0
    Hi there,

    I hope someone can help me with this subject. I need to make a rig that is able to test the cart belts. They are driven by 75V DC motors (not much info, they come from China). I ve got a big transformer as a spare unit for entire system but need to create something smaller. I tested the cart already using this transformer (belt drives left or right lets say for 0.5sec) and consuming 1.35 Amps when running.

    Cant buy a ready posh, expensive, adjustable power supply, need to be tight in costs and preferably build my own one.

    So I think
    https://in.rsdelivers.com/product/rs-pro/10-5904/rs-pro-200va-2-output-chassis-mounting/0503916

    transformer (maybe 60V) then full bridge rectifier and smoothing/regulating to get 75V DC.

    Are there any traps and problems i need look into first? Rig would be designed to test for smooth motor operation too, no jumps, slips etc.

    Thanks in advance

    Kris
     
  2. ElectricSpidey

    Active Member

    Dec 2, 2017
    590
    130
    If you don’t need a lot of regulation, you could probably build a simple zener regulator.


    Simple design…few parts…etc.
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    17,768
    5,404
    You don't need smoothing capacitors for motor testing if the test just involves motors only.
    A 75v secondary transformer and a suitable bridge is all that would be needed.
    Max..
     
    DickCappels likes this.
  4. Hymie

    Active Member

    Mar 30, 2018
    640
    168
  5. Colin55

    Active Member

    Aug 27, 2015
    519
    48
    75v transformer is too high.

    50v to 55v is needed.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
    17,768
    5,404
    Only if Capacitive smoothing is used otherwise use the 75v.
    Max.
     
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