Method of applying a tube member in a stator slot in a rotating electrical machine
AssigneeAsea Brown Boveri AG
InventorsBertil Larsson, Bengt Rothman
Life of this patent
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Abstract
A method for mounting a tube in a space having a shape corresponding to the shape of the tube. The tube is inserted into the space, pressurized with a hot pressure medium causing the tube to expand until the space is filled, then a cold pressure medium is substituted for the hot pressure medium while maintaining constant pressure causing the tube to solidify in its expanded shape. Also, a rotating electric machine having such a tube between windings of a high-voltage cable in a stator slot.
Claims20
A method for mounting a tube in a space in a rotating electric machine defined by a restricting area having a shape corresponding to a shape of the tube comprising the steps of:
- inserting the tube into the space;
- pressurizing the tube with a hot pressure medium having a temperature that causes the tube to soften and expand until an outer periphery of the tube assumes the shape of the restricting area of the space;
- and
- substituting a cold pressure medium for the hot pressure medium while maintaining a pressure constant to the pressure used in the pressurizing step causing the tube to solidify and permanently assume an expanded shape.
A rotating electric machine, comprising:
- a stator including a stator yolk and stator slots separated by stator teeth extending inwardly from the stator yolk and having an undulated side and a flat side;
- stator cable windings of an insulated cable having a substantially round cross-section configured to be received into concave portions of the undulated side of the stator slots and form spaces between the insulated cable windings and the flat side of the stator teeth, the spaces extending axially through the stator, said concave portions having a rounded cross-section portion that substantially matches a corresponding outer portion of said insulated cable;
- and
- at least one tube made of a dielectric material mounted in the stator slots so as to fill the spaces between the insulated cable windings and the flat side of the stator teeth.
An apparatus for mounting a tube in a space of a rotating electric machine defined by a restricting area having a shape corresponding to a shape of the tube comprising:
- means for inserting the tube into the space;
- means for pressurizing the tube with a hot pressure medium having a temperature that causes the tube to soften and expand until an outer periphery of the tube assumes the shape of the restricting area of the space;
- and
- means for substituting a cold pressure medium for the hot pressure medium while maintaining a pressure constant to the pressure used in the pressurizing step causing the tube to solidify and permanently assume an expanded shape.
Dependencies are inferred from the claim text.