Astrosyn's E401 disk stepper motor
Not much larger than the dial of a wristwatch, Astrosyn's E401 disk
stepper motor is based on a bipolar-wound stator and hybrid rotor to
offer a true 1.8o stepping angle from a body length of just 10mm.
Featuring shielded ball bearings at both ends and a steel end bell, the
80g weight motor delivers more than 200g.cm torque while drawing 120mA
and running at over 1kHz input frequency. The non-cumulative step angle
error (including hysteresis) is measured in hundredths of a degree.