Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1981-04-29
1983-05-10
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 58, 310 64, H02K 900
Patent
active
043831907
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to electrical machines, and more particularly to non-reversible electrical machines with gas cooling.
PRIOR ART
Known in the art is a gas-cooled electrical machine (USSR Inventor's Certificate No. 520,670, published in Discoveries, Inventions, Industrial Designs and Trade Marks Bulletin No. 25, 1976) comprising fans on the rotor shaft, radial spacing members between the stator core stacks, and longitudinal partitions between the body and the core of the stator, adapted to define segmental inlets and outlets for a coolant. The pressure chambers of the fans are associated with the segmental inlets via the area of the end connections of the stator winding. The longitudinal partitions are mounted in the planes accommodating the radial spacing members, are joined therewith and directly with the body, thus forming the same number of segmental inlets and outlets.
In the described machine, those areas of the stator core which are juxtaposed to the end connections of the stator winding and produce excessive amount of heat cannot be cooled effectively.
There is another non-reversible electrical machine (British Pat. No. 1,503,404, published Apr. 6, 1976) with gas cooling, comprising a rotor whose shaft carries fans, a stator core with radial vent ducts, and a stator winding having end connections located in end faces of the machine, said elements being accommodated in a body having built-in gas coolers and pressure and exhaust chambers for the fans. The stator core, together with a space separating it from the body, is divided, in a tangentional direction, into segments which are associated with the fan exhaust chambers directly via the area of the end connections of stator winding, and also into another segments which are arranged in alternative relation to said first segments, are equal in number to the latter and are associated with the fan pressure chambers via the gas coolers.
In this machine, the gas flow through the cooling circuit is adapted to pass twice over the radial vent ducts of the stator core as follows: first, it is fed from the external surface of the stator core to a gap defined between the rotor and the stator core, and then the gas flow is led in the opposite direction.
The areas of the stator core juxtaposed to the end connections and producing greater heat as compared to the remaining portions of the stator core are cooled down effectively, but a two-fold movement of the gas flow via the radial vent ducts results in accumulation of heat content. As a result, the temperature of said areas of the stator core in the segments associated with the exhaust chambers of the fans and cooled by the gas differs considerably from the temperature of the main portion of the core.
DISCLOSURE OF THE INVENTION
An object of the invention is to provide, in a non-reversible electrical machine with gas cooling, for more effective cooling of those areas of the stator core which are juxtaposed to the end connections of the stator winding.
There is provided a non-reversible electrical machine with gas cooling, comprising a body with built-in gas coolers, said body accommodating a stator core with radial vent ducts, a stator winding having end connections arranged in end face areas of the body, and a rotor whose shaft carries fans, the latter being provided with pressure and exhaust chambers, the stator core, together with a space separating it from the body, being divided in a tangential direction into segments which are associated with the fan exhaust chambers directly through the area of the end connections of the stator winding, and also into another segments which are arranged in alternate relation to said first segments, are equal in number to the latter and are associated with the fan pressure chambers, according to the invention, the radial vent ducts in each area of the stator core juxtaposed to the end connections of the stator winding are separated from the remaining radial vent ducts by two cylindrical partitions, one of said partitions being positioned wi
REFERENCES:
patent: 2707243 (1955-04-01), Baudry et al.
patent: 2742582 (1956-04-01), Bahn et al.
patent: 3110827 (1963-11-01), Baudry
patent: 3254246 (1966-05-01), Philofsky et al.
patent: 3413499 (1968-11-01), Barton
patent: 3739208 (1973-06-01), Shartrand
patent: 4051400 (1977-09-01), Armor et al.
patent: 4163163 (1979-07-01), Gurevich et al.
Azarov, deceased Evgeny M.
Azarova, administrator by Ekaterina A.
Belova Tamara N.
Gurevich Elrikh I.
Ignatiev Anatoly D.
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