MULTI-PARAMETER ELECTROMAGNETIC CONVERTER FOR CONTROL AND DIAGNOSTIC SYSTEMS
Abstract
The work presents the scientific and technical results of the study of the electromagnetic multi-parameter transducer for the cylindrical metal products parameters determining, whhich principle is based on the allocation of the amplitude and phase of the spatial harmonics of a nonuniform magnetic field presented in the form of a Fourier series.
The physic-mathematical model of an electromagnetic transducer with non-uniform distribution of an electromagnetic field for a conductor with a current located along the lateral surface of a cylindrical product at a distance d from the center of a metallic cylinder of radius a. The spatial problem of the distribution of a magnetic field variable in time is solved and expressions allowing calculating the functions for any spatial harmonic are obtained and it is possible to make a picture of the distribution of the field in any area (inside the product, between the product and conductor with current, as well as beyond this conductor).
Mathematical expressions are obtained to determine amplitude and phase of transducer’s signal n-th spatial harmonics, which are generated in the measuring windings located along the surface of the cylindrical object with the angular coordinate φ on a circle of radius d. Experiments have been carried out to confirm the adequacy of the transducer’s proposed model, which showed the difference between the calculated and experimentally obtained values of the EMF of the transducer output signal.