Design of an innovative coal screening system using nonlinear power based electromagnetic vibroexciter: a feasibility study

Vibrating technologies are used in the different engineering fields of industries. These technologies allow to intensify the technological processes in increasing the quality of products and labour productivity. In the paper, the development of a control circuit of the electro-magnetic vibrating exciter (EMVE) has been studied. A new type of mineral screening concept design using EMVEs has been proposed. This paper represents an analysis of the nonlinear automatic oscillation system composed with a single stroke electromagnetic vibrating exciter, a velocity transducer, nonlinear amplifier and an inverter. The results were obtained for the frequency and amplitude of automatic oscillations by the describing function method depending on the parameters of the system. It was established that internal negative feedback was partly stabilized the amplitude of oscillations by the variation of frequency. The results of the paper can be used in designing and developing of Vibration setup for the wide range of frequencies.