Asea Brown Boveri Inc.

Bbc Brown, Boveri & Company, Limited

Karl Schollhorn

Werner Haditsch

Rudolf Paul

In large electric machines, the electrical connection between the exciter supply lead (5, 6), which extends axially in the center of the rotor, and the exciter winding conductors in the winding overhang of the rotor is highly stressed electrically and mechanically. If the terminal stud (1) is slotted in the shank (2) in the longitudinal direction of the stud, there being provided at least three slots (13) which extend radially up to the longitudinal axis of the stud, the stud becomes more elastic transversely to the longitudinal direction, and it can be purposively cooled.

Terminal stud in the rotor of an electric machine

In large electric machines, the electrical connection between the exciter supply lead (7, 8), which extends axially in the center of the rotor, and the exciter winding conductors (4) in the winding overhang (3) of the rotor is highly stressed electrically and mechanically. If use is made of an elastic exciter terminal stud (13) made from steel, and the connecting conductors (17, 18) are supported between the exciter terminal stud (13) and the conductors (4) of the rotor winding overhang on the rotor cap, preferably on its cap plate (6), excessive stresses occur neither on the shaft (2) nor on the connecting conductors (17, 18). It is preferable in this arrangement to make use of a terminal stud (13) that is slotted in the longitudinal direction of the stud and has at least three slots. Such a stud is elastic transversely to its longitudinal direction and can be purposively cooled.

Rotor of an electric machine having an exciting current supply lead

A rotor of an electrical machine having directly cooled rotor winding, including winding conductors forming a conductor bundle, located one above the other in respective grooves and fastened therein by respective groove wedges, the winding conductors each having at least two adjacent half cooling ducts extending in the longitudinal direction of the conductors. Provided in a central section of the rotor assembly are two gas outlets offset relative to one another in a peripheral direction of the rotor and in which the cooling ducts are interrupted by separating means. At each interruption point, the respective half cooling duct is in connection with a respective radially extending duct, which ends at the surface of the rotor. In order to avoid increases in temperature in the region of the gas outlet, the gas outlets of a conductor bundle are offset retative to one another in the longitudinal direction of the conductors. The radial ducts emerge into holes penetrating the groove wedges approximately radially.

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Birr, Switzerland

Karl Schollhorn