Implementation of Closed-Loop Stepper Motor Driver Based on Lead Angle Estimation

Abstract

In this work, a position controller for hybrid stepper motors has been successfully designed. The proposed method is based on a lead angle estimator to generate a desired excitation phase of the currents in two phases of a stepper motor. This results in producing the highest motor torque. The step-out problem, which is a common phenomenon of stepper motors when operating in open-loop position control mode with varied load torque, especially at high speed, is overcome. Therefore, the stepper motor can operate in a wide operating speed range. The proposed method is effective in implementation using a Digital Signal Processing (DSP)-based stepper motor drive platform. The position tracking performance of the proposed method was validated by means of experimental comparison with the open-loop position control technique.  Index Terms-closed-loop control, open-loop control, phase advance control, hybrid stepper motors Kien Minh Le received the B.S. degree in electrical engineering from