Unipolar Stepper Motor Driver Circuit

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Revision as of 14:33, 27 July 2006

This page presents a circuit for driving high-power unipolar stepper motors. Here you will find all the information needed to make your own. This circuit allows step-level control and can be easily modified for other modes of operation.

What you need

  • Power
    • +5v (low power)
    • +12v (high power)
  • ICs
  • Discrete Components
    • (4x) 2N6045 NPN Darlington Transistor
    • (8x) 1N4001 Diodes
    • (2x) 3.3kOhm Resistors
  • Other
    • PC104 or High-Level Controller
    • 12v Unipolar Stepper Motor

Circuit Schematic and Photo

The L297 has several inputs that can be generated by a PC/104 stack or other controller. This circuit allows you to control each step, in full-step mode. Meaning: You can tell it to move one step in either direction (of course you can make it move fast and it will continuously rotate). The two inputs are a direction and a pulse. In the next section you will find a program to control this using xPC.

Here is the CircuitMaker file: Unipolar Stepper Driver Circuit

Unipolar motor driver.jpg Unipolar motor circuit photo.jpg

You may find the following diagrams useful when constructing this circuit:

L297 pinout.jpg NPN pinout.png Stepper wire colors.png
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