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US 2006/0219880 A1Published application
Optical sensor for electric machines
AssigneeSiemens Aktiengesellschaft
InventorsMatthias Braun, Rolf Vollmer
Life of this patent
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Abstract
The invention provides that a ferrofluid seal is used in order to create an effective sealing for optical sensors in speed-controllable electric motors.
Claims8
An optical sensor for an electrical machine, comprising:
- a bearing;
- a coding disk;
- and
- sealing means for providing a seal between the bearing and the coding disk, said sealing means being constructed in the form of a ferrofluid seal.
1 more element
An optical sensor for an electrical machine, comprising:
- a sensor shaft defining an axis;
- a bearing for support of the sensor shaft;
- a coding disk disposed on the sensor shaft at a distance to the bearing;
- and
- a ferrofluid seal disposed between the bearing and the coding disk to prevent lubricant from migrating from the bearing toward the coding disk.
2 more elements
A ferrofluid seal for use as protection of an operating member against ingress of any contaminant.
Dependencies are inferred from the claim text.