METHOD AND ARRANGEMENT FOR MONITORING THE BEARING

专利名称：METHOD AND ARRANGEMENT FOR

MONITORING THE BEARING CURRENTS INAN ELECTRICAL MACHINE

发明人：Hans-Richard Kretschmer,Aron

Steckenborn,Oliver Theile

申请号：US13055818申请日：20090721

公开号：US20110175631A1公开日：20110721

专利附图：

摘要：The invention inter alia relates to a method for monitoring the bearing current

of an electrical machine (). An electrode () arranged at a distance (d) to a shaft and theshaft—due to the gap (S) between the electrode and the shaft—produce a measurementcapacitance (C) and an electric shift current (i) which flows through the measurementcapacitance when there is a temporal change of the voltage (Ug) applied between theshaft and the housing is measured. A measurement signal (Ms) indicating a bearingcurrent flow is generated when the shift current or a measurement variable produced bythe shift current meets a predetermined trigger criterion. Preferably, the electrode has acircular inner contour so that the gap is annular. The annular inner contour results in anerror compensation in the case of a balance error of the shaft because the factor dC/dtremains at least substantially constant. Due to the contactless measurement of the shiftcurrent, no contact brushes for contacting the shaft are required. The method can beused irrespective of whether the bearings are insulated from the machine housing or not.

申请人：Hans-Richard Kretschmer,Aron Steckenborn,Oliver Theile

地址：Berlin DE,Berlin DE,Berlin DE

国籍：DE,DE,DE

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