Resistive properties of indium and indium-gallium contacts to CdS : R. T. Johnson, Jr. and D. M. Darsey, Solid-St. Electron.11 (1968), p. 1015

Abstract

This chapter presents the investigations carried out on the various rolling-element bearings after being operated under the influence of electric fields, and pure rolling friction on the roller bearing test machine. The significant magnetic flux density was detected on surfaces of the bearings lubricated with low-resistivity lubricant under the influence of electric fields. The electro-adhesion forces in the bearings using low-resistivity lubricant increase under the influence of electric fields in contrast to those with high-resistivity lubricants. This chapter presents a theoretical model to determine the magnetic flux density developed on the inner and outer surfaces of inner race and outer race, and on the surface of rolling-elements, of a rolling bearing operating under the influence of electric current. The flux density, analytically determined, is found to agree well with the measured flux density developed on the surfaces of races and rolling-elements of the bearings tested in a test rig under the influence of electric current. In addition, the magnetic flux density on the surfaces of damaged bearings of motors and alternators has been measured, and the theoretical model has been used to determine the amount of current flow through the damaged bearings. The value of current flow through the bearings, thus established, has been found to be close to that evaluated by the measurement of shaft voltage and bearing resistance. Analysis presented in this chapter can establish the amount of the flow of the leakage current through the bearings by determining the magnetic flux density on the surfaces of rolling-element bearings. The current flow, thus established, along with the measurement of the shaft voltage, leads to establish the bearing impedance.