Starting resistance for a rotating electrical machine
AssigneeBBC Brown, Boveri & Company, Limited
InventorsUrban Ulrich, Beat Zimmerli
Life of this patent
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Abstract
A rotating starting resistance for a rotating electrical machine is disclosed. The resistance includes a helicoidal resistance wire that is wound in the shape of a torus, and connected to the rotating shaft of the electrical machine. The resistance wire may be directly fastened to a supporting member by means of a glass fiber cord suitably impregnated with a synthetic resin. The helicoidal nature of the starting resistance permits efficient cooling, and allows minimization of the overall height of the resistance. The resistance wire, which is wound in the shape of a helicoidal torus, may be reinforced at either the inner or outer diameter of the torus.
Claims13
A starting resistance, for a rotating electrical machine having a rotating shaft, comprising:
- an annular supporting sleeve member mounted directly on the shaft of the electrical machine;
- an annular member mechanically fastened to said supporting member;
- a helicoidal starting resistance element mechanically fastened to said annular member so as to form a torus coaxial with and surrounding the shaft,
- whereby the starting resistance element rotates together with the shaft of the rotating electrical machine;
- and
- fastening means inserted between adjacent helicoidal windings of said resistance element for mechanically fastening said resistance element to the annular member.
A rotating starting resistance for a rotating electrical machine comprising:
- a helicoidal wire resistance element wound in the shape of a torus;
- an annular supporting member mounted on a rotating member of the electrical machine for rotation therewith;
- means for mechanically fastening said resistance element to said supporting member coaxially with the rotating member, said fastening means being inserted between adjacent helicoidal windings of said resistance element;
- and
- means included on said annular supporting member for accomodating said fastening means.
Dependencies are inferred from the claim text.