Development of a segment of a series of linear displacement sensors

Abstract

Purpose. Presentation of the results of development and practical implementation of a segment of a series of inductive linear displacement sensors (linear variable differential transformer LVDT) for hydraulics systems of the aerospace industry. Methodology. Calculations of three-dimensional magnetic fields are carried out with the finite elements method. The solution of the differential equations connecting the input voltage, current, magnetic flux and EMF of the windings is performed by numerical integration. Results. As a result of calculations, the sensor configuration, embodied in the models DLP-17, DLP-30, DLP-50 and DLP-80, was obtained. Tests of the prototype models of the all sensors confirmed the principle workability of the adopted design and design solutions in its development. Originality. The use of three-dimensional field models allows to make an accurate calculation of the sensor's magnetic field, taking into account the edge effects on its characteristics. As a result of the calculations, a variants of the configurations of the secondary windings was chosen, which made it possible to increase the accuracy of the sensors. Practical value. The developed sensors DLP-17, DLP-30, DLP-50 and DLP-80 in its technical characteristics are correspond to the design specification.