SYSTEM OF ADAPTIVE FREQUENCY CONTROL OF SPEED OF ROTATION OF THE ASYNCHRONOUS THREE-PHASE ELECTRIC MOTOR OF THE ROTOR CRUSHER DRIVE

Abstract

The analysis of a design and the principle of work of modern rotary crushers for crushing of waste of polymeric materials is carried out. Ways of possible improvement of the existing equipment for crushing of waste of polymeric materials are defined. The principles of automation of the rotary crusher drive are formulated. The structural scheme of the frequency control system of the rotor crusher drive is developed. The analysis of operation of asynchronous three – phase motors at frequency control of speed of rotation is carried out. The mechanical characteristics of the electric drive of the rotary crusher are determined. The methodological and theoretical bases of the study are the main provisions of strength of materials, theoretical mechanics and the theory of electric drive. The paper for the first time uses a comprehensive approach to the study of the grinding process of polymeric materials, which takes into account the dependence of their physical and mechanical properties on the conditions of the process, as well as kinematic and electrical characteristics of the equipment. The object of research is the technological process of mechanical grinding of light industry waste in rotary crushers. The subject of the study is the electric drive of a rotary crusher for processing polymer waste. The expression for calculation of mechanical characteristics of asynchronous electric motors according to their passport data is received that allows to calculate modes of work of drives of crushers at various power frequencies and various control laws. The use of frequency control of the electric drive of the rotary crusher for the processing of waste polymeric materials from light industry will increase the reliability of its operation. The research results can be used in the design of new and modernization of existing structures of rotary crushers for grinding waste polymeric materials.