Bbc Brown, Boveri & Company, Limited

Asea Brown Boveri Ag

Willibald Zerlik

Roland Schuler

Johann Schubert

Gerhard Neidhofer

A device for holding bar ends of a stator winding in a dynamoelectric machine that has an inner ring which fits closely against the bar ends and is shaped like the inside of a cone. An outer support has at least one outer ring and a device for clamping the inner ring to the outer support. The clamping device is supported on the end face of the laminated body or on the stator housing. In order to detune the natural frequency of the winding overhang assembly, additional masses are situated between adjacent winding ends, or arranged on the external outer ring and are uniformly distributed over its circumference. The additional masses consist of a multiplicity of mutually insulated metal wires or metal strips which extend in the circumferential direction and are held together by means of an adhesive and a bandage.

Device for holding the bar ends of a stator winding in a dynamoelectric

Winding rods, built into the stator of an electrical machine, are no longer safe to operate after leakages in a water chamber. After this waterchamber has been removed, as is necessary anyway, a flexible, gas-proof hose is pulled upon the rod end, and the machine-side end of the hose is attached to the rod in a gas-proof manner. The other hose end is connected to a vacuum pump and, by evacuating the hose, the water that has penetrated into the rod insulation is removed by the same route as it penetrated into the insulation. The quality of this drying process is monitored by dielectric measurements.

Process for drying the insulation of stator winding rods of electrical

An electrical connection for an electrical machine having a slip ring bolt mounted with axial play in a radial shaft borehole and a suitable electrical connecting link between a slip ring and the slip ring bolt is provided, wherein the slip ring is mechanically disconnected from a rotor shaft. In one embodiment of the electrical connecting link, a contact carrier is rigidly connected with the slip ring bolt and which penetrates into an annulus formed in a slip ring on the side of the slip ring bolt. A contact lamination tape is placed into an annular slot formed in the contact carrier, which effects electrical connection between the contact carrier and the slip ring. In a second embodiment, a contact ring is provided at the end of the slip ring on the side of the slip ring bolt, which is connected with a slip ring bolt through a strap of copper-stranded wire.

Electrical connection

Flexible, electrically insulating pipe connections are required for electrical machines with liquid-cooled rotor winding between the water distribution chambers, which are rigidly connected to the body of the rotor, and the water distribution headers in the coil end. A pipe connection is proposed whose section on the side of the distribution chamber is designed as an insulating link which projects at least partially into the wall of the water distribution chamber. The section on the side of the coil end is designed as a flexible link which can be shifted in axial direction relative to the insulating link or which is axially movable in itself.

Flexible, electrically insulating pipe connection

In the coil end of a rotor of an electrical machine, the terminal ends emerging from different grooves and resting on different cylindrical surfaces must be electrically connected with each other and hydraulically with a water chamber. This is accomplished by distributors which include a connecting stud and two shanks which extend therefrom. The shanks have bores which extend at an acute angle into a bore on the connecting stud. This causes only very small flow resistance. The freedom that is gained in terms of choosing the desired shank lengths, and the freedom to choose the interval between the free shank endings, gives rise to a number of production advantages. Furthermore, the quality tests for checking the junction of the distributor pieces with the terminal endings of the windings are simplified.

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Birr, Switzerland

Willibald Zerlik