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Power Supply for stepper

Discussion in 'Electronic Design' started by ben, Feb 8, 2006.

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  1. ben

    ben Guest

    I have a golf cart charging transformer with two 45 V output coils. I
    need 30 to 40 Volts DC at ~ 20A to run stepper motors. Can anyone help?
    TIA, Ben
     
  2. Ian Stirling

    Ian Stirling Guest

    Take one coil, attach a bridge rectifier, a capacitor, and run a buck
    SMPS off it?
     
  3. ben

    ben Guest

    Thank you for your prompt reply. However, since I am just an in-home
    shop tinkerer, I did not understand "buck SMPS". After hours of
    research I realize this is beyond my abilities to design with any
    possibility of it working. If possible could you or someone supply a
    schematic with component listing.
     
  4. Ian Stirling

    Ian Stirling Guest

    Alas, it's probably not really possible.
    At this sort of power level (800W), there are a number of things in the
    construction, heatsinking, ... that have to be just right.

    Not to mention that if you don't understand what you're doing the
    schematic needs to have all the 'obvious' things spelled out that may
    not be normally present.

    What sort of electronics projects hgave you done, htere may be other
    ways.
     
  5. Chris

    Chris Guest

    Hi, Ben. The easiest solution for a "tinkerer" would be to use a
    rectifier and filter capacitor to get around 60VDC, then use a
    resistive current limiter to keep the coil current to spec.

    L-R drive has the advantage of getting somewhat more torque at higher
    speeds, at the obvious cost of wasting a lot of power through heat.

    See Jones on Steppers:

    http://www.cs.uiowa.edu/~jones/step/

    particularly Section 4: Current Limiting for more information on this
    and other methods to accomplish what you want. See particularly Fig.
    4.1a. -- suitable for lower speed operation.

    If you're looking for an inexpensive source of surplus power resistors,
    you could do worse than Surplus Sales of Nebraska.

    http://www.surplussales.com

    Be careful, and don't forget the diodes!

    Good luck
    Chris
     
  6. Guest

    Ian,
    How about a modest step-down transformer in front of the thing,
    allowing a simple full-wave bridge + filter cap? Might there be a
    suitable tapped transformer, such as for line voltage conditioning?

    Regards,
    James Arthur
     
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