Stepper Electric Drive with the Function of Suppressing Resonance Phenomena

Abstract

The practice of using digital motion reproduction systems based on the positioning stepper electric drive reveals the problem of the occurrence of resonant phenomena at certain frequencies of the drive bandwidth. Such phenomena are accompanied by an abnormal increase in the indicators of noise characteristics, non-algorithmic omission of discrete positions and malfunction of the drive. This article proposes the structure of a stepper electric drive with an extreme electromagnetic momentum regulator that implements the function of suppressing resonance in a microstepping mode of operation based on information from the accelerometer sensor. It solves the problem of studying the criteria of drive stability in the frequency domain of resonance phenomena. The purpose of this study is to synthesize the structural scheme of a stepper electric drive, which makes it possible to compensate for the influence of resonance phenomena in a given frequency domain of the engine, and to determine the stability conditions in the resonance zone. On the basis of the developed block diagram of the drive, the known conditions of its operation and the accepted assumptions, the authors of the article synthesize and describe factors for the realization of stable positional motion in the vicinity of the resonant frequency and its harmonic components. In connection with the task of the study, the conditions of stability in the low, medium and high frequencies are determined. The results of the synthesis of a stepper electric drive allow quantifying the parameters of the controller. Experimental studies of a stepper drive with a torque regulator show the possibility of its steady behavior in the entire frequency range of its operation.)