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high Amp Bipolar Stepper — Parallax Forums

high Amp Bipolar Stepper

pridepkpridepk Posts: 1
edited 2012-01-03 17:20 in Robotics
Dear All
Can anyone provide me circuit diagram of bipolar Stepper of 3 to 6 amp. I have 4 wire stepper and I program a PIC 16F84A to drive the stepper motor but the motor is huge. So I am very confused to drive it. I study on net but can’t find the proper circuit diagram of Mosfet or any other power transistor through which I can drive my bipolar Stepper

I am high appreciate

thanks
Nadeem

Comments

  • idbruceidbruce Posts: 6,197
    edited 2012-01-01 05:21
    Hello Nadeem
    I study on net but can’t find the proper circuit diagram of Mosfet or any other power transistor through which I can drive my bipolar Stepper

    You are talking about one of the best kept secrets, that is why it is so difficult to find information. Keep in mind that you do not have to run a stepper motor at full current. If you are looking for a quick fix, then you could simply buy an existing driver from http://www.geckodrive.com/index.php.

    If you want to build you own, well that is quite a different story. There are several different control schemes, but basically you need two full h-bridges, preferably a chopper design with current control. And I am unaware of any IC solution capable of delivering 6 amps to stepper motor.

    For a basic idea of what one of these h-bridges should look like to control one coil, then go here, http://machinedesign.com/content/chopper-controlled-current-limiting-1209-0.

    To read the entire article, go here, http://machinedesign.com/article/limit-current-to-boost-stepper-motor-torque-1209.

    When you have a working model for controlling 6 amps with two h-bridges made from mosfets and with current control, please send me the schematic. :) However, I am sure you will keep it a secret like everyone else :)

    Bruce
  • Spiral_72Spiral_72 Posts: 791
    edited 2012-01-03 17:20
    There are many stepper driver IC's available that have no power stage.... that is it's a controller and you build the power stage with a *FET, big transistors of whatever your flavor.

    The L297 is one such IC. I had a whole resource of driver ICs, information and circuits till my drive died with no backup.

    CNC Zone is a very good resource concerning these things. They have a forum and entire sections devoted to this very thing; DYI controllers.

    Another option is a stepper driver from Automation Direct or another source. I had a driver bookmarked that was $120 as memory serves, three axis with a current capacity in that range. I don't remember what communication it used.
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