The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 16, 2016
Filed:
Feb. 03, 2011
Sven Gattermann, Zirndorf, DE;
Ralf Kowalewski, Fürth, DE;
Carsten Probol, Buckenhof, DE;
Arno Steckenborn, Berlin, DE;
Oliver Theile, Berlin, DE;
Hans Tischmacher, Lauf, DE;
Sven Gattermann, Zirndorf, DE;
Ralf Kowalewski, Fürth, DE;
Carsten Probol, Buckenhof, DE;
Arno Steckenborn, Berlin, DE;
Oliver Theile, Berlin, DE;
Hans Tischmacher, Lauf, DE;
SIEMENS AKTIENGESELLSCHAFT, München, DE;
Abstract
A method and device for assessing damage to a rolling bearing caused by bearing currents, in particular high-frequency bearing currents, in an electric machine which is electrically connected to an inverter, in particular to an inverter having a DC voltage link circuit, is described. The rolling bearing has a lubrication gap between an inner bearing ring and a rolling body and between an outer bearing ring and the rolling body. The method includes detecting the energy of an electric discharge event in the lubrication gaps, searching for a coincident event having a frequency above one GHz indicative of a damaging bearing current event, detecting a frequency of occurrence of discharge events, and evaluating the discharge events by correlating the frequency of occurrence and the energy of the discharge events.