Patent ID: 9046579
Filing Date: 2015-06-02
Classification: G01M,G01R

Abstract:
1. A method for analyzing electric arc discharges taking place between an inner bearing ring and an outer bearing ring in a roller bearing, comprising the steps of: a) setting a defined operating state of the roller bearing by setting at least one of the following parameters: rotational speed of the roller bearing, temperature of the roller bearing, an imbalance of the roller bearing causing vibrations, lubricants, axial loads, radial loads, tilt loads, tilting of the inner bearing ring relative to the outer bearing ring, pulse shape and pulse repetition rate of an applied electrical voltage, bearing play, and pre-existing damage to the roller bearing, b) generating, in the defined operating state, a plurality of electric arc discharges by applying a pulse-shaped electrical voltage between the inner bearing ring and the outer bearing ring, c) measuring, for each electric arc discharge, at least one characteristic value representative of at least one of energy, power, voltage, current and duration of the electric arc discharge, d) determining a qualifying value as a function of the at least one characteristic value, and e) evaluating only those electric arc discharges having a qualifying value greater than a predefined limit value, wherein the qualifying value is proportional to the energy and inversely proportional to a third power of the duration of the electric arc discharge.