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Stepper motor pulse length duration — Parallax Forums

Stepper motor pulse length duration

TransistorToasterTransistorToaster Posts: 149
edited 2007-08-20 11:54 in Propeller 1
Hello,
I am looking for information on how much time to energize the coils of a stepper motor. Initially, I don't intend to put a rotary encoder to get feedback on the precise angle, but if I absolutely need that, then I will put it.
Ideas, links, suggestions?
Frank

Comments

  • Fred HawkinsFred Hawkins Posts: 997
    edited 2007-08-19 17:31
    http://www.solarbotics.net/library/pdflib/pdf/motorbas.pdf
  • GavinGavin Posts: 134
    edited 2007-08-20 03:41
    Use a driver chip, like the Allegro A3977, much less to worry about.

    All you need then is generate step and direction inputs.

    Cheaper parts are L297/298, but the 3977 gives you 1/8 microstepping, very useful for CNC.

    Most driver chips are only good for max 32/40/50v. if you·need higher voltage/current then mosfet designs are better.

    Bipolar drive is better than unipolar.

    Gavin
  • TransistorToasterTransistorToaster Posts: 149
    edited 2007-08-20 04:26
    Fred,
    Thanks for the document. I learned a lot from it.

    Gavin,
    I downloaded the Allegro datasheet. Just wondering, what is that in your Avatar?
    Frank
  • GavinGavin Posts: 134
    edited 2007-08-20 11:54
    Frank,

    My Avatar is a very lossy jpeg of my cnced X1 micromill with HTS rapid toolchanger and vice.

    Background is my messy shed[noparse]:)[/noparse]

    Google "Jones on Steppers" That's where most of us start.

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

    Gavin
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