Stepper Motors - 2-Phase vs. 5-Phase Hybrid Stepper Motor Comparison
Stepper Motor Theory
Stepper Motors – code, circuits, & construction
A Four Phase High Resolution Stepper Motor Providing 200 Steps per Rev
Controlling Stepper Motors Using Power IO Wildcard, C Library Functions and MOSFET Drivers for Four-phase Six-wire Unipolar Permanent-magnet Stepper Motor