Electrical Damping System for a Stepper Motor
Original Publication Date: 1978-Jul-01
Included in the Prior Art Database: 2005-Feb-21
When a stepper motor stops, oscillations occur before the load settles down. An electrical damping system is described that rapidly dampens out these oscillations. The system becomes effective when the rotor is in the potential well that is formed around the desired stopping position by turning on the appropriate phases. The system further depends on stopping the motor with two phases on. It can be either two of three phases or two of four phases. The system further incorporates a tachometer for velocity feedback. It is assumed in this system that the motor has two phases that establish a potential well around the desired home position and that the rotor is brought to a position and velocity within this potential well.