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US 6,310,418 B1Granted
Reduction of sparking in large rotating electrical machines
AssigneeAlstom UK Limited
InventorsPaul Eaton Clark, Roger Henry Regan
Life of this patent
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Abstract
In a large rotating electrical machine having a rotor comprising conductor bars of copper located in slots in a rotor core and connected together at their ends to form a winding, the conductor bars are electrically insulated from the rotor core by a coating on the conductors of a ceramic-based material. The coating serves to prevent sparking occurring between the conductor bars and the rotor core.
Claims13
A rotor for a rotating electrical machine, comprising:
- a rotor core of magnetic material, the rotor core having slots therein;
- conductor bars located in the slots in the rotor core and electrically connected together to form a winding;
- and
- a plasma-sprayed ceramic-based powder coating on the conductor bars for preventing sparking between the conductor bars and the rotor core, said coating having a microporous structure comprising particles with voids therebetween, the coating covering the conductor bars before the conductor bars are located in the slots, the coating being impregnated with a synthetic resin material such that the voids are filled with the synthetic resin material.
1 more element
A rotating electrical machine rated at a power in excess of 10 kilowatts having a rotor, comprising:
- a rotor core of magnetic material and having slots therein;
- conductor bars located in the slots in the rotor core and electrically connected together to form a winding;
- a coating on the conductor bars for preventing sparking between the conductor bars and the rotor core, the coating being a ceramic-based material having a firing temperature and a heat treatment before the conductor bars are located in the slots at or above the firing temperature of the ceramic-based material;
- and
- the coating consisting of a lithia/zinc oxide/silicate glass ceramic material.
2 more elements
Dependencies are inferred from the claim text.