Asea Brown Boveri Ag

Alstom (switzerland) Ltd

Josef Tommer

Ernst Brem

J&uuml;rgen Baer

In a turbo generator with a rotor with direct gas cooling, which rotor is provided with a rotor winding arranged around a central rotor body, said rotor winding being on the front sides covered by one each annular cap plate, and in which rotor cold cooling gas for cooling the rotor flows into ring gap segments between the cap plate and the rotor body, whereby the ring gap segments are bordered, when seen in circumferential direction, on the sides in each case by the section of an end spacer plate provided between the cap plate and the rotor winding, whereby this section is projecting into the ring gap, improved cooling is achieved in that separations of the cooling gas stream on flowing into the ring gap segments are avoided by designing the sections of the end spacer plates, whereby these sections adjoin the ring gap, in a manner that is advantageous with respect to the flow.

Turbo generator with a rotor with direct gas cooling

A generator with double driving machinery. On one side of the generator, a gas turbine is coupled directly with a generator shaft. On the other side of the generator, opposite from the gas turbine, a steam turbine is connected via a transmission gear with the generator shaft. The transmission gear is situated between the generator shaft and a slip ring shaft of a slip ring unit. During operation, the slip ring shaft is not influenced by a torque stress formed by the steam turbine. The generator shaft and the slip ring shaft, as well as a first gear shaft, situated between the generator shaft and the slip ring shaft, are constructed at least partially as hollow shafts. The first gear shaft may also be constructed completely as a hollow shaft. The bores of the generator shaft, the slip ring shaft, and the first gear shaft hold an excitation conductor for transmitting an excitation current from the slip ring unit to the generator.

Generator with double driving machinery

An electrical machine (,), in particular a generator, comprises a rotor (,) with pole zones, in which pole zones amortisseur bars (,) designed as wedges are arranged, which amortisseur bars (,), on the outside of the rotor (,), are pushed into slots (,) provided for this purpose and running in the longitudinal direction and are held in the slots (,) by supporting means (,) against the centrifugal forces occurring during rapid rotation of the rotor (,) and which are connected to one another in an electrically conductive manner at the ends of the rotor (,) by an amortisseur ring (,) or amortisseur segments (,), which enclose the rotor (,) in an annular or ring-section-shaped manner. In such a machine, reliable fixing and electrical bonding of the amortisseur bar in the slot when the machine is stopped and at low rotational speeds with at the same time ease of fitting is achieved in that prestressable spring elements (,) are arranged in a distributed manner on the underside of the amortisseur bars (,), which spring elements (,), in the prestressed state, enable the amortisseur bars (,) to be pushed into the slots (,) without hindrance and, after the prestressing has been removed, press the amortisseur bars (,) against the supporting means (,) and at the ends of the rotor (,) against the amortisseur rings (,) or amortisseur segments (,).

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Würenlos, Switzerland

Josef Tommer