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What Is A Unipolar Step Motor Drive?

by Jeff Kordik
What is a unipolar step motor driver? How does a unipolar driver compare to a bipolar step motor driver? When step motors first became popular as a simple, inexpensive means to control position and speed, the transistors required to drive them were very expensive. What, transistors expensive? Don’t they put, like, a billion of them on a chip?
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