High-Precision Tracking Simulation of Stepper Motor Based on Improved SVPWM

In order to reduce the ripple and torque fluctuation of hybrid stepper motor, an improved SVPWM algorithm is proposed in this paper. Firstly, the mathematical model is established based on the working principle of two-phase stepper motor, then the improved space vector pulse width modulation (SVPWM) algorithm is developed. Meanwhile, adaptive adjustment PI controllers for the speed loop and position loop are respectively conceived and proposed, to tackle with the low-precision and slow-response problems in various conditions. Finally, a high-precision tracking control system model, on the basis of above-mentioned SVPWM-driven control strategy and three-closed-loop control strategy, is developed through the MATLAB/Simulink tools. Both simulation and experimental results show that the tracking errors are all within the range of ±0.1° under different tracking modes, which provides an evaluated means to understand the engineering performance of each part in the servo system in advance, and to carry out targeted device selection and software algorithm design work.