Stepper Motor Basics

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Introduction

This page is here to help you learn enough about stepper motors to use them on a CNC machine, or to service an existing CNC. This information is made available to the public.

Wiring Diagrams:

Wiring an 8-wire Stepper Motor

Bipolar Parallel Configuration

Bipolar Parallel configuration increases the stepper motor's torque at higher speeds. The following diagram is a typical speed/torque curve for a step motor wired in parallel vs. series. Notice there is not as much low speed torque, but there is more torque on the high end. Kind of like a 3:36 gear ratio in your 55 chevy versus a 4:11.Interesting, Isn't it.

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Now, here's how you wire a 8 lead stepper motor in bipolar parallel.

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Bibliography

: Image credit : http://www.ams2000.com/stepping101.html