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1. 发明申请

US20110175631A1 METHOD AND ARRANGEMENT FOR MONITORING THE BEARING CURRENTS IN AN ELECTRICAL MACHINE 有权
标题翻译：用于监测电机轴承电流的方法和装置
公开(公告)号：US20110175631A1
公开(公告)日：2011-07-21
申请号：US13055818
申请日：2009-07-21
申请人： Hans-Richard Kretschmer , Aron Steckenborn , Oliver Theile
发明人： Hans-Richard Kretschmer , Aron Steckenborn , Oliver Theile
IPC分类号： G01R27/26
CPC分类号： H02K11/20 , H02K11/40
摘要： The invention inter alia relates to a method for monitoring the bearing current of an electrical machine (10). An electrode (100) arranged at a distance (d) to a shaft and the shaft—due to the gap (S) between the electrode and the shaft—produce a measurement capacitance (C) and an electric shift current (i) which flows through the measurement capacitance when there is a temporal change of the voltage (Ug) applied between the shaft and the housing is measured. A measurement signal (Ms) indicating a bearing current flow is generated when the shift current or a measurement variable produced by the shift current meets a predetermined trigger criterion. Preferably, the electrode has a circular inner contour so that the gap is annular. The annular inner contour results in an error compensation in the case of a balance error of the shaft because the factor dC/dt remains at least substantially constant. Due to the contactless measurement of the shift current, no contact brushes for contacting the shaft are required. The method can be used irrespective of whether the bearings are insulated from the machine housing or not.
摘要翻译：本发明尤其涉及用于监测电机（10）的轴承电流的方法。与电极和轴之间的间隙（S）距离（d）与轴和轴（距离）配置的电极（100）产生流过的测量电容（C）和电移动电流（i）当测量在轴和壳体之间施加的电压（Ug）的时间变化时，通过测量电容。当由换档电流产生的换档电流或测量变量满足预定的触发准则时，产生表示轴承电流的测量信号（Ms）。优选地，电极具有圆形内轮廓，使得间隙是环形的。由于因数dC / dt保持至少基本恒定，所以在轴的平衡误差的情况下，环形内轮廓导致误差补偿。由于移位电流的非接触式测量，不需要接触轴的接触刷。无论轴承是否与机器外壳绝缘，都可以使用该方法。

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