SEMS Control of Low-Frequency Vibrations of Objects Based on Magnetic Levitation

Abstract

Problem statement: one of the urgent problems in the energy and industry is to improve the reliability of various equipment. An effective method for increasing the reliability of equipment is diagnosing the state of machines and predicting their performance. In measuring technology, for diagnostics of low-speed equipment with rotation frequencies of a unit of Hz, for example, hydroelectric generators of hydroelectric power plants, inertial electromechanical converters are used. Purpose of research: ithe latest developments of such transducers, an electromagnetic suspension with parametric feedback is used to control the rigidity of an oscillatory electromechanical system. However, for centering the moving part in electromechanical converters, flexible guides are used, which are sources of dry friction, which minimizes the sensitivity threshold and the lower limit of the frequency range. Currently, the most promising direction for solving this problem is the introduction of magnetic bearings based on the levitation effect, which allows you to completely eliminate mechanical contact and, accordingly, reduce the sensitivity threshold of the transducer. It should be noted that the levitation effect is widely used in transport systems, however, it is practically not used in measuring systems. In measuring systems, the main requirement is to ensure the measurement error. Results: therefore, the proposed SEMS control based on the levitation effect with improved metrological characteristics. The complexity of the problem lies in the fact that the transducer solves two problems: ensuring the stability of the orientation of the inertial part in a magnetic field and the required accuracy by linearizing the amplitude-frequency characteristic. These tasks are accomplished using SEMS. The proposed SEMS can monitor and diagnose equipment in various fields of human activity. This problem is especially relevant in the hydropower industry.