(1) After the stepper motor is powered on, the internal excitation winding generates a rotating magnetic field.
(2) The rotating magnetic field interacts with the rotor, causing the rotor to receive a certain torque and rotate.
(3) The rotation of the rotor drives the planetary gears to rotate.
(4) The planetary gears drive the internal gear ring to rotate, thereby reducing the speed.
(5) The output shaft outputs the reduced power.