Abstract: In the two-phase hybrid stepping motor position control system, the sliding mode algorithm is adopted. However, the problem of large chattering exists. The sliding mode control algorithm based on the concept of boundary layer is improved. And the quasi-sliding mode sliding control algorithm is optimized. A two-phase hybrid stepping motor model is built in SIMULINK, and simulation verification is carried out. The results show that the use of quasi-sliding mode control reduces the litter amplitude of the system by 50% compared to the general sliding mode control. Dynamic performance is greatly improved.

Key words: two-phase hybrid stepping motor, quasi-sliding mode control, position control