Bipolar motors have 4 wires connecting to the two separate coils inside the motor - one pair for each coil. Types of stepper motor=Broadly speaking there are two types of stepper motor - unipolar and bipolar. Please be aware that this text continues into the next Post. It is not intended to be an expert dissertation on the subject. Here you will find all the information needed to make your own. This page presents a circuit for driving high-power unipolar stepper motors. This note is intended to provide guidance for the Arduino user who is new to stepper motors. I have no connection with the company apart from being a satisfied user of their A4. Throughout this note I have referenced Pololu products. I think it would be possible to miss some important info if you only read the bit that immediately interests you. The information is presented under several different headings and there is quite a bit of overlap and cross- referencing of ideas so I suggest that you should read all of the note at least once. Introduction=I find myself repeatedly typing similar replies to similar questions about the basics of stepper motors and I thought it would be useful to write this note as it will be a little more comprehensive than any individual reply. The shaft or spindle of a stepper motor rotates in. 1 A stepper motor is an electromechanical device which converts electrical pulses into discrete mechanical movements. With three driver inputs it is possible to create only two levels at the ends.
Please note that this is a simplified circuit that only makes use of three MCU outputs.
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