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US 5,635,779 AGranted
Electrical machine with an axial fan
AssigneeAsea Brown Boveri AG
InventorsJurgen Baer, Hans Zimmermann
Life of this patent
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AssigneeAsea Brown Boveri AG
InventorsJurgen Baer, Hans Zimmermann
Estimating the term…
In gas-cooled electrical machine with an axial fan (9) at one shaft end and with a rotor (1) and a stator body surrounded by a machine housing (14), a gas-guide device (18) arranged coaxially to the rotor shaft is provided in the outflow space (17) of the axial fan (9), out of which gas-guide device the cooling gas conveyed by the axial fan is fed to the rotor and to the stator body and stator winding. Said gas-guide device (18) comprises a plurality of guide rings (19-25) in the form of a cone envelope and spaced radially from one another and a ring part (27) likewise in the form of a cone envelope, which rings and ring part are connected to one another and to the machine housing (14) directly, or indirectly by means of bars (28, 29) extending essentially radially and/or guide plates (36, 36'). Ring-shaped channels (K.sub.1, . . . , K.sub.8) widening continuously in the direction of flow of the cooling gas are formed between respective radially adjacent guide rings, and between the ring part (27) and its adjacent guide ring. The gas-guide device (18) brings about a pressure transition, and it reduces the outlet losses downstream of the latter in relation to the hitherto conventional axial outlet provided by the rotor configuration. Between 15% and 25% of the pressure losses in the machine can be saved in this way and consequently the cooling effect can be greatly increased.
A gas-cooled electrical machine with an axial fan at one shaft end, with a rotor and a stator body which is surrounded by a machine housing and which is provided with a stator winding having winding heads on the two end faces of the stator body, with an inflow space of the axial fan, formed essentially by the end wall of the machine housing and by a partition wall between the winding head and said end wall, and with an outflow space of the axial fan, out of which the cooling gas conveyed by the axial fan is fed to the rotor and to the stator body and stator winding, wherein there is provided in the outflow space of the axial fan a gas-guide device which is arranged coaxially relative to the rotor shaft and which comprises a plurality of guide rings in the form of a cone envelope and spaced radially from one another and a ring part likewise in the form of a cone envelope, said rings and ring part being connected to one another and to the machine housing by means of bars extending essentially radially and guide plates, and wherein ring-shaped channels widening continuously in the direction of flow of the cooling gas are formed between respective radially adjacent guide rings.
Dependencies are inferred from the claim text.