Reduction of shaft voltage
AssigneeABB Schweiz AG
InventorKari Tikkanen
Life of this patent
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Abstract
A rotating electrical machine and a method of manufacturing a rotating electrical machine. The machine including a machine frame, a rotor, a shaft attached to the rotor and bearings supporting the shaft and the rotor in the machine frame. The rotating electrical machine includes further an electrically conducting member having a hole, the electrically conducting member being attached to the frame such that the shaft extends through the hole.
Claims10
A rotating electrical machine comprising a machine frame, a rotor, a shaft attached to the rotor, and bearings supporting the shaft and the rotor in the machine frame,
- wherein the rotating electrical machine includes further an electrically conducting member having a hole, the electrically conducting member being attached to the machine frame such that the shaft extends through the hole, and wherein the electrically conducting member and the shaft form a capacitive coupling without a galvanic coupling.
A method of manufacturing a rotating electrical machine with shaft voltage limitation, the method comprising:
- providing a rotating electrical machine with a machine frame and a shaft;
- providing an electrically conducting member with a hole, a diameter of the hole corresponding to a diameter of the shaft;
- attaching the electrically conducting member to the machine frame such that the shaft extends through the hole;
- and
- enlarging the hole in the electrically conducting member by operating the rotating electrical machine to rotate the shaft such that a galvanic coupling between the shaft and the electrically conducting member is lost and a capacitive coupling is obtained between the shaft and the electrically conducting member.
A rotating electrical machine comprising a machine frame, a rotor, a shaft attached to the rotor and bearings supporting the shaft and the rotor in the machine frame,
- wherein the rotating electrical machine includes further an electrically conducting member having a hole, the electrically conducting member being attached to the machine frame such that the shaft extends through the hole,
- wherein the electrically conducting member is in galvanic connection with the shaft when attached to the machine frame, and
- wherein a diameter of the hole in the electrically conducting member is adapted to increase, such that a galvanic coupling between the shaft and the electrically conducting member is lost, to form a capacitive coupling between the electrically conducting member and the shaft.
Dependencies are inferred from the claim text.