METHOD FOR GAS COOLING OF ELECTRIC MACHINE AND ELECTRIC MACHINE WITH GAS COOLING Russian patent published in 2005 - IPC

FIELD: electro-mechanical engineering, in particular, engineering of gas cooling systems for electric machines, primarily, turbo-generators.

SUBSTANCE: method for gas cooling of electric machine includes feeding cooled gas into stator core in its middle portion with use of additional cooling at inlet of stator ventilation channels, and zones for draining gas, heated up in electric machine, are organized in middle portions of stator core. Cooling gas for cooling devices via ventilators is fed into chamber for accumulation of cooling gas, from which it is directed further for cooling of electric machine in three flows: first flow is sent into air gap between stator and rotor, second flow is sent into ventilation channels of rotor, third flow prior to sending thereof into middle portion of stator core is additionally cooled, and after passing thereof through middle portion of stator core it is isolated in air gap from first two gas flows by means of organization of special channel in air gap, while heated gas is drained through radial ventilation channels of middle portions of stator core. For realization of described method, electric machine is developed, having body, cooling machines positioned inside the latter with additional cooling channel, stator with core having radial ventilation channels, rotor, mounted in stator with air gap and having ventilations channels, inlets and outlets of which are positioned at different rotation radiuses, ventilators, positioned at the shaft on different sides of rotor barrel. Gas cooling of such additional machine is realized through organization of chambers, first one of which is positioned within area of location of stator windings portions, second one - between middle portion of stator core and additional cooling channel, third one - between edge portions of stator core and cooling devices, while radial ventilation channels of middle portion of stator core are joined with second chamber, and radial ventilation channels of middle portions of stator core are joined with third chamber. In air gap in axial direction additional special channel is mounted, made by means of ring-shaped cover of non-magnetic material, edges of which are solidly held together at inner surface of stator recess in such additional way, that inside this channel all radial channels of middle portion of stator core are connected, and, at least, same number of radial ventilation channels of middle portions of stator core, adjoining middle portion of stator core on both sides, while remaining radial ventilation channels of middle portions of stator core are connected to aforementioned air gap.

EFFECT: higher intensiveness of cooling of both winding and core of stator of electric machine.

2 cl, 1 dwg