Abstract: The invention relates to an electric generator, comprising a rotor; a stator enclosing the rotor; a housing; a water-operated cooling device, comprising a water inlet and a water outlet and channels in the rotor and stator for guiding cooling water through the same; the housing is enclosed; the water-operated cooling device is the only cooling device of the generator.

Abstract: The invention relates to an electric generator, comprising a rotor; a stator enclosing the rotor; a housing; a water-operated cooling device, comprising a water inlet and a water outlet and channels in the rotor and stator for guiding cooling water through the same; the housing is enclosed; the water-operated cooling device is the only cooling device of the generator.

Abstract: The invention relates to an electric machine, comprising a stator; a rotor carried by a shaft; a brush-slip ring device, the slip ring of which encloses the shaft and is connected with said shaft in a torsion-proof manner; a cooling system for cooling the brush-slip ring device. The invention is characterized by the following features: fan blades are provided which are connected to the shaft in a torsion-proof manner and which comprise an air flow for supplying air to the brush-slip ring device.

Abstract: A compressor unit comprises a centrifugal compressor for compressing a gas, having a rotor with one or more compressor impellers, and an electric motor having a stator and a rotor, for driving the rotor of the compressor. The compressor and the electric motor are accommodated in a common gas-tight housing which is provided with a gas inlet and a gas outlet. The rotor of the compressor and the rotor of the electric motor are arranged on a common rotor shaft which is mounted in magnetic bearings. The rotor shaft comprises a single unit and is mounted in two radial magnetic bearings, each in the vicinity of one end of the common rotor shaft, and one axial magnetic bearing, which is arranged in the vicinity of one of the radial bearings.

Abstract: The invention relates to an electrical machine with a stator and a rotor, the rotor having a winding system (1) and being provided with a measuring/control system (2). Means are also provided which have a voltage tap (14) on the winding system of the rotor and which are used to supply the measuring/control system (2). The advantage of the voltage tap (14) on the winding system (1) is that a separate voltage source on the rotor is not required.

Abstract: A wind power installation includes a nacelle, and energy conversion system for converting wind power into electric energy. The energy conversion system includes a heat-generating source which is disposed in the nacelle and constructed to include a closed primary cooling system using air for dissipating generated heat. Further provided is an open secondary cooling system which uses ambient air for cooling heated air from the primary cooling system.

Abstract: A wind power installation includes a nacelle, and energy conversion system for converting wind power into electric energy. The energy conversion system includes a heat-generating source which is disposed in the nacelle and constructed to include a closed primary cooling system using air for dissipating generated heat. Further provided is an open secondary cooling system which uses ambient air for cooling heated air from the primary cooling system.

Abstract: A wind power installation includes a nacelle for housing a generator, and a turbine having at least one rotor blade. At least the generator includes a closed primary cooing system, and the nacelle is provided with a cooling system for cooling the primary cooling system in dependence on an output of the generator or generator losses.

Abstract: A wind power installation includes a nacelle for housing a generator, and a turbine having at least one rotor blade. At least the generator includes a closed primary cooing system, and the nacelle is provided with a cooling system for cooling the primary cooling system in dependence on an output of the generator or generator losses.

Abstract: During the operation of an electrical machine, brush dust is generated as a result of a frictional wear of the brushes (5, 50), The brush dust is deposited in undesired locations of the electric machine and causes sparkovers or increased frictional resistance. In order to solve the above-mentioned problem, the invention provides for a brush dust collecting device (41) comprising a dust collecting bead (6, 13, 21, 42) mounted in direct plurality to the slip ring (1, 11, 23, 53).