ELECTRIC ARC DISCHARGE EVALUATION METHOD, AND ASSOCIATED TEST STAND
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Accused Products
Abstract
Electric arc discharges between bearing rings in a roller bearing are analyzed by setting a defined operating state based on rotational speed of the roller bearing, temperature of the roller bearing, an imbalance of the roller bearing causing vibrations, lubricants, axial/radial/tilt loads, tilting of the bearing rings relative to each other, pulse shape and pulse repetition rate of an applied electrical voltage, bearing play, and pre-existing damage to the roller bearing. A pulse-shaped electrical voltage between inner and outer bearing ring generates electric arc discharges, wherein for each electric arc discharge a characteristic value representative of energy, power, voltage and/or current and duration of the electric arc discharge is determined. Only those electric arc discharges are evaluated that have a qualifying value determined in accordance with at least one of the characteristic values greater than a predefined limit value.
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Citations
30 Claims
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1-15. -15. (canceled)
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16. 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:
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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. - View Dependent Claims (17, 18, 19, 20)
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21. A drive controller for a converter-powered electric motor having a roller bearing, the drive controller comprising:
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a non-volatile memory having stored therein classified operating states of the roller bearing, wherein the classified operating states are determined from defined operating states of the roller bearing which include 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,wherein the stored classified operating states include only operating states classified as permissible, or only operating states classified as impermissible operating states, or operating states classified as both permissible and impermissible, in which case a classification of each operating state is also stored, wherein the permissible or impermissible operating states are determined by; a) setting a defined operating state of the roller bearing by setting at least one of the parameters, 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, and repeating steps a) through e) to set additional defined operating states of the roller bearing, determining for each defined operating state a frequency of occurrence of electric arc discharges to be analyzed, and classifying the defined operating states as permissible or impermissible depending on the determined frequency of occurrence.
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22. A test stand for a roller bearing, said roller bearing having an inner bearing ring, an outer bearing ring and roller elements disposed between the inner bearing ring and the outer bearing ring, wherein either the inner bearing ring or the outer bearing ring is mounted on a shaft with a rotation lock, the test stand comprising:
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a base body having a mounting arrangement, in which the roller bearing is removably mounted, with the mounting arrangement being made of an electrically insulating material or being electrically insulated from a remainder of the base body by an intermediate element made of an electrically insulating material, a variable rotation-speed electric drive electrically insulated from the roller bearing and arranged at a fixed location on the base body and operating on the shaft, a voltage generator configured for applying a pulse-shaped electric voltage with an adjustable pulse shape and pulse repetition rate to a junction between the inner bearing ring and the outer bearing ring, and a measuring device for measuring at least one characteristic value representative of at least one of energy, power, voltage, current and duration of the electric arc discharge taking place between the inner bearing ring and the outer bearing ring in response to the applied pulse-shaped electric voltage. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification