SYNTHESIS OF CONTACTLESS DRIVES OF MACHINE TOOLS AND STUDY OF THEIR PARAMETERS AND CHARACTERISTICS

The study objective is to synthesize contactless drives for various purposes, a spindle on gas-static bearings of a grinding machine and a non-stop dynamic pump, and to study their parameters and characteristics. The paper solves the problems of developing a method for synthesizing contactless drives for machine tools for various purposes, performing computer experiments to study the parameters and characteristics of gas-static spindle bearings and hydrodynamic parameters of fluid flow in a rotating pump impeller, and developing a mathematical model for the stability of an annular rotor in a force field. The research is carried out by two theoretical methods – the analytical method according to classical calculation methods and computational computer experiments in CAE-programs of machine-building CAD, and the adequacy of the developed mathematical model of stability of the annular rotor is checked in a field experiment. The novelty of the work lies in the development of a generalized synthesis technique for contactless drives of machine tools, which uses two independent methods of theoretical research, as well as the proposed mathematical model of stability of a rotating annular rotor in a force field. The results of studying the parameters and characteristics of gas-static bearings of a spindle and a centrifugal pump by two methods are presented, and a generalized algorithm for their synthesis is described. Conclusions: a generalized synthesis technique has been developed for contactless drives for various purposes – spindles on gas-static bearings and non-stop dynamic pumps, which are high-speed, energy-efficient and highly reliable due to the actual absence of wear on movable structural elements; the study results of the parameters and characteristics of gas-static spindle bearings and hydrodynamic parameters of fluid flow in a rotating impeller of a non-stop pump are presented, obtained by two methods; a mathematical model of the stability of a rotating annular rotor without mechanical supports has been developed, and its adequacy has been experimentally confirmed by demonstrating stable rotation in the fluid of an annular rotor impeller.