High Voltage Forum

General electronics => Electronic Circuits => Topic started by: klugesmith on November 23, 2022, 10:23:07 PM

Title: Stepper motor drive without switching
Post by: klugesmith on November 23, 2022, 10:23:07 PM

The simplest and most common stepper motors, in my experience, have four wires and two stator coils.
Need to be driven with two bi-polar current or voltage sources in quadrature.

A suitable power source is another permanent-magnet stepper motor whose shaft is rotated.
In this example, manually turning the pinion on wide motor makes the worm-gear motor turn with exact speed ratio.
A poor man's selsyn motor set.


[edit] This set doesn't work backwards, even when worm shaft is spun at 1500 RPM with a drill motor.
Perhaps due to profound mismatch between the motors' electromechanical parameters?   The small motor does have a permanent magnet, so one can feel cogging when turning shaft by hand.