When a stepper motor requires a sequence of four different on-off combinations (e.g., wire 1 on, 2 on, 3 off, 4 off) cycled repeatedly to continue rotating, is a group of four
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electromagnetism - Inner structure of a bipolar stepper motor? - Electrical Engineering Stack Exchange
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delay - Bipolar stepper motor: What should the sequence timing be? - Electrical Engineering Stack Exchange
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Controlling Stepper Motors Using Power IO Wildcard, C Library Functions and MOSFET Drivers for Four-phase Six-wire Unipolar Permanent-magnet Stepper Motor
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