The primary feature of stepper motors is listed right within their name: their ability to ‘step’ forwards and backwards, ...

[Frank Herrmann] had an interesting idea to turn a geared DC motor into a servo motor assembly, but with a stepper motor-like interface. By stacking some small PCBs behind the motor body ...

combining the precision of servo systems with the reliability and simplicity of stepper technology. The P8000 series, ...