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Shaft-grounding ring

A grounding ring and conductive connection technology, which is applied to the connection with the grounding device, connection, current collector, etc., can solve the problems of expensive, complex manufacturing of the shaft grounding ring, system damage, etc., and achieve low friction, simple and low-cost manufacturing Effect

Active Publication Date: 2018-11-23
KACO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of conductive threads makes the manufacture of shaft grounding rings complex and correspondingly expensive
In use there is also the risk of the thread coming off and causing contamination and possibly damage to the entire system up to complete failure
Changing the direction of rotation of the shaft is also problematic because the wires are difficult to adjust accordingly to reverse the direction of rotation

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0069] The AC motor controlled by the known frequency converter is at the motor shaft 68 ( Figure 21 ) to generate harmful induced voltages. When this voltage crosses the resistance of the lubricant in the bearing, this voltage will discharge through the bearing, whereby the bearing is heavily loaded and can be damaged over a longer period of use. Harmful induced voltages in the motor shaft 68 can be reliably dissipated by means of the shaft grounding ring, so that the voltage is no longer discharged via the bearings.

[0070] However, shaft grounding rings can be used not only in electric motors, but also in transmissions, for example. In general, shaft grounding rings are used where induced voltages, currents or charges should be derived from the shaft.

[0071] according to figure 1 with 2 The shaft grounding ring has an outer clamping ring 1 made of electrically conductive material, forming a housing, which has an L-shaped cross-section in axial sectional view. A cla...

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PUM

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Abstract

The invention relates to a shaft-grounding ring which is used to remove induced voltages or electric charges from a first machine element (68), preferably from a shaft, into a second machine element (69) and has an annular housing (1), which consists of electrically conductive material and is conductively connected to the one machine element (68, 69) and has an electrically conductive connection to at least one discharging element (8). The discharging element consists of an electrically conductive material and has an electrically conductive connection to the other machine element. The discharging element (8) is a disk-shaped discharging body that extends at least over part of the circumference thereof.

Description

technical field [0001] The invention relates to a shaft grounding ring according to the preamble of claim 1 . Background technique [0002] Frequency converters are increasingly used to control electric drives. However, they cause induced voltages with variable frequency in the drive shaft. These induced voltages can damage motor bearings or cause EMV issues such as unpleasant noises in a radio. Shaft currents cause small melt marks on the motor bearing running faces and balls, which lead to denting of the bearing running faces over time and eventually damage the motor bearings. [0003] For the discharge of charge or voltage from the motor shaft, a shaft grounding ring (EP 1872463 B1) is known which has a wire as the discharge element which is fastened between two plates and protrudes radially inwards beyond the plates. The plates and wires are accommodated in an annular housing which is electrically conductively connected to the grounded housing. The use of conductive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K7/00H02K11/40
CPCH02K7/003H02K11/40H01R39/025H01R39/12F16C19/52F16C41/002
Inventor R·伦茨W·文德尔J·班特尔A·保罗M·帕尔默A·维尔纳
Owner KACO