The present invention relates to an electric machine comprising a rotor winding head. Such machines are used, for example, in power plants such as pumped-storage power plants. Here, double-fed asynchronous machines in the power range from 20 MVA are used in variable-speed operation.
DE 10 2011 105 427 A1 discloses an electric machine that has a device suitable for monitoring the rotor winding head. For this purpose, a conductor for conducting energy is applied to the winding head. The device also comprises a detector for detecting the energy flow in the conductor. The known solution has the disadvantage that retrofitting such a device to an existing machine is not readily possible.
The object on which the present invention is based is to specify a device that can be easily integrated into an existing machine.
WO 2017/157679 A1 discloses a device for monitoring the air gap of an electric machine by use of a microwave radar system that can be easily integrated into an existing machine. However, WO 2017/157679 A1 does not provide any indications of how the disclosed technology may be used to monitor the rotor winding head.
The inventors have set themselves the object of modifying the technology disclosed in WO 2017/157679 A1 such that it can be used to monitor the rotor winding head.
According to the invention, this object is achieved by an electric machine having the features of the independent claim. Further advantageous developments are given by the dependent subclaims.
The solution according to the invention is explained below with reference to figures.
It is advantageous if the probe 6 can be attached to existing elements of the electric machine. Thus, in
With the aid of the arrangement described, a deformation of the rotor winding head can be detected, which results in a change (usually a reduction) in the distance between the sensitive end of the probe and at least one rotor winding element.
The described device can be easily retrofitted in an existing electric machine, since for this purpose the lance-shaped probe can simply be pushed between the stator winding elements, in the region of the stator winding head, and fastened to existing elements of the stator. The stator winding head is easily accessible from the outside. The voltage insulation of the probe protects it from the voltage prevailing there during operation of the electric machine. The transmitting and receiving unit may be arranged on the outside of the stator or close to it. This also simplifies retrofitting.
Number | Date | Country | Kind |
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10 2018 123 845.2 | Sep 2018 | DE | national |
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/EP2019/074629 | 9/16/2019 | WO |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2020/064386 | 4/2/2020 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
9337765 | Strack | May 2016 | B2 |
20190020244 | Frank et al. | Jan 2019 | A1 |
Number | Date | Country |
---|---|---|
379864 | Mar 1986 | AT |
102009037990 | Feb 2011 | DE |
102011105427 | Dec 2012 | DE |
0608442 | Aug 1994 | EP |
2221625 | Aug 2010 | EP |
2672241 | Dec 2013 | EP |
H04313074 | Nov 1992 | JP |
2000346916 | Dec 2000 | JP |
2013127554 | Sep 2013 | WO |
2017157679 | Sep 2017 | WO |
Entry |
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JP2000346916A English translation (Year: 2022). |
WO2017157679A1 English translation (Year: 2022). |
JPH04313074A English translation (Year: 2022). |
DE102009037990A1 English translation (Year: 2022). |
Number | Date | Country | |
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20220037968 A1 | Feb 2022 | US |