Step angle and steps per revolution
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The number of steps per revolution of a stepper motor is made up of the pole pair number and the phase or stator windings, i.e. z = p * m (the rotor of the 2-phase hybrid stepper motors consists of 50 soft magnetic teeth that form a north and south pole due to the magnets lying between them while the 2 phases are wound on the 4 windings A + A/ and B + B/ of the respective pole shoe displayed by 90°).
For more details, also see the animation of a steppermotor.
A further feature is the step angle for a full step of the stepper motor: a = 360 /z or a = 360 /p * m. The number of steps per revolution for the stepper motor STxx18.. series is z = p * m = 50*4 = 200 steps whereas the step angle for the STxx09 series is a = 360°/p * m = 360°/100 * 4 = 0.9° step.
