Electrical machine having an apparatus for avoiding damaging bearing currents, and a corresponding method
AssigneeSiemens Aktiengesellschaft
InventorsAndreas Binder, Armin Schrepfer, Jurgen Wolf
Life of this patent
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Abstract
The aim is to avoid damaging lubricating-film discharges occurring via bearings (WL) in electrical machines. For this reason, provision is made for a current to be forced to flow through the bearing (WL) specifically, with the aid of a current source (IQ). The current then flows from one of the two bearing components via the lubricating film to the other bearing component. Alternating currents are particularly suitable since the lubricating film is conductive, so that the capacitance defined by the lubricating film cannot be charged, or can be charged only slightly.
Claims18
1-13. (canceled)
An electrical machine comprising:
- a first active part;
- a second active part which magnetically interacts with the first active part;
- a bearing device by which one of the active parts is borne on the other active part, the first active part being connected to a first bearing component, the second active part being coupled to a second bearing component, and with a lubricating film separating the first and second bearing components from one another;
- and
- a current source coupled to the bearing device, said current source being adapted to apply a specific current from the first bearing component to the second bearing component via the lubricating film so that the conductivity of said lubricating film is sufficient to permit a discharge of one bearing component to the other bearing component via the lubricating film.
A method for avoiding damaging bearing currents in a bearing in an electrical machine, the electrical machine having two bearing components which move with respect to one another, said method comprising the steps of:
- providing a lubricating film between the two bearing components, the lubricating film separating the two bearing components from one another;
- and
- applying a specific current to the bearing device from one bearing component via the lubricating film to the other bearing component so that the conductivity of said lubricating film is sufficient to permit one bearing component to discharge to the other bearing component via the lubricating film.
Dependencies are inferred from the claim text.