US2626365A - Generator cooling - Google Patents

Generator cooling Download PDF

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Publication number
US2626365A
US2626365A US282982A US28298252A US2626365A US 2626365 A US2626365 A US 2626365A US 282982 A US282982 A US 282982A US 28298252 A US28298252 A US 28298252A US 2626365 A US2626365 A US 2626365A
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US
United States
Prior art keywords
stator
rotor
gas
zone
cooling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US282982A
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English (en)
Inventor
Rene A Baudry
Paul R Heller
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Westinghouse Electric Corp
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Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US282982A priority Critical patent/US2626365A/en
Application granted granted Critical
Publication of US2626365A publication Critical patent/US2626365A/en
Priority to FR1077253D priority patent/FR1077253A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/22—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors consisting of hollow conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating

Definitions

  • stator cooling-system can advantageously use the same high fan-pressure as the rotor-cooling system, or when it is undesirable to use a separate booster-fan for applying a higher differential pressure to the rotor than to the stator of the machine.
  • present invention relates to such a situation, in which it is necessary to do two things in order tov provide the necessary pressure-differential for forcing the recirculating gas through the rotormember. This is particularly true when the rotor-coolingsystem is one in which the coolingducts, which coo-l the rotor-conductors, are vented to the air gap at the center of the'machine, midway between the ends of the rotor-core.
  • annular air-gap baflie for providing a restricted gas-passage from the pressurized endzone into the air gap, and we provide restricted passages in the stator-ventilating path from thepressurized end-zone across the outside of the stator-core to an intake-chamber and thenceradially inwardly through radial ventilating-spaces in the stator core, to the air gap, so as to make sure that there is the necessary pressure-differential between the pressurized end-Zone, and the air gap, to properly cool the rotor, member.
  • Figure 1 is a partially diagramamtic and much simplified longitudinal sectional view, not to scale, illustrating an exemplary form of embodiment of ourinvention as applied to. atwo-pole turbine generator, thesection-plane through the genera 2 ator being indicated by the broken section-line II in Fig. 2; and
  • Fig. 2 is a transverse cross-sectional view, on the section-plane II--II in Fig. l.
  • the drawing illustrates, the application of our invention to a large turbine generator, which may be exemplified by a two-pole, -cycle, three.- phase generator having a rating in excess of 150,000 kilowatts, at a. voltage of at least 5,000 or 10,000 volts, usualy more, although we are not limited, of course, to any particular rating.
  • the generator comprisesv a stator member 3 and a rotor member 4, having an air gap 5 therebetween.
  • These stator and rotor members. 3 and 4 are enclosed in a substantially gas-tight housing 6 which is filled with gas, preferably withhydrogen, at any suitable pressure, said hydrogen bathing both the stator member 3 and the rotor member 4, as is well. known.
  • the stator, member 3 is provided with an annular laminated stator-core 1', having windingreceiving stator-slots 8.
  • the stator-core 1 comprises a plurality of bundles or" stator-laminations separated by radial ventilating-spaces 9 and ID.
  • a stator-winding II is provided, having coil-sides lying within the stator-slots 8 and also having end-windings I2.
  • Each end of the rotor member carries a fan" or blower" I3 which creates a sufficiently large pressure-difierential to cause the proper circulation of the hydrogen.
  • Each fan 13 is associated with a suitable shroud or partition-means M for producing a pressurized end-zone 5; at that end ofthe machine, for maintaining the necessary differential gas-pressure for recirculating the gas.
  • the hydrogen-circulation system also includes one or more coolers it, which may be of a conventional type and disposition.
  • Therotor member 4 includes a cylindrical rotor-core I! which has a plurality of windingreceiving rotor-slots l8.
  • a rotor-winding I9 is provided; having cooling-ducts 20 and coil-sides 2
  • the rotorwinding I9- also has end-windings 22.
  • the cooling-ducts 20 for the rotor-winding might be any sort of hydrogen-flow ducts for directly cooling the rotor-winding conductors, and especially the coil-sides 2
  • the cooling-ducts 20 for the rotor-winding iii are preferably formed by means of hollow rotorconductors 23, as shown, in which case these cooling-ducts extend in cooling-relation to the rotor end-windings 22 as well as to the rotor coil-sides 2
  • the rotorend-windings 22 are surrounded by-a retaining; ring 24, in a known manner.
  • the rotor member has a gas-inlet space 25 under the retaining ring 24, preferably at each end of the machine, whereby gas may enter the rotor member from the pressurized end-zone I at that end of the machine. From this gas-inlet space 25, the cooling-gas is lead into the rotorconductor cooling-ducts 20, by any suitable communication-means such as holes 26. At some point, preferably near the middle of the rotorcore IT, at any rate intermediately between the ends of the rotor-core, we provide gas-outlet means 21, in a known manner, for discharging the cooling-gas from the rotor cooling-ducts into the air gap 5.
  • each end-winding support 28 has an annular baflie-portion 29 which approaches close to the retaining ring 24 at that end of the machine, for providing a restricted gas-passage therebetween, so that there can be a substantial pressure-differential between the pressurized end-zone I5 and the air gap 5.
  • zoning-means such as a plurality of axially spaced partition-means BI, surrounding said stator-core, for providing a plurality of discharge-zones 32, at least includedin one discharge-zone 32 at each end of the statorcore I, Axially displaced or interspersed with respect to the discharge-zones 32, the partitionmeans 3i also produce at least one intermediately disposed intake-zone 33, surrounding the statorcore I.
  • communication-passages are provided from the discharge-zones 32 to the cooler I6, and through the cooler to the fan-and-partition assembly I4-I 5 for returning the recirculating gas to the pressurized end-zones I5.
  • a communication-means such as a pipe 34, for conducting gas from each of the pressurized endzones 5 to the intake-zone 33, or to the nearest intake-zone 33, if ther are more than one such zone, which is also, or may be, in accordance with known practice.
  • the rotor member 4 is cooled by means of high-velocity gas, which flows from each of the pressurized end-Zones I5, through the gasinlet space under the retaining ring 24 at that end of the rotor member, and thence through the holes 26 into the rotor-ducts 20, and thence to the gas-outlet means 21 at the center of the rotor, where the gas is discharged into the air gap 5.
  • a relatively low-pressuredrop communication path, or gas-flow path is provided through the gas-discharging radial ventilating-spaces 9 into the discharge-zones 32, and thence through the cooler I6 and back to the fan I3, without much gas-pressur difierential existing between the air gap 5 and the intake side of the fan I3.
  • stator member 3 must be cooled by some suitable cooling-means. It is contemplated, within the scope of our present invention, that any suitable stator-cooling means may be used, whether or not it includes the direct cooling of the stator-winding II, as set forth in our application Serial No. 248,852. At any rate, in the combination to which our present inventor-core I.
  • the stator-cooling means includes at least the radial ventilatingspaces 9 and Ill in the stator-core.
  • the gas which discharges from the air gap 5 through the discharging radial ventilating-spaces 9 cools the stator-core, at the portions of the core which are surrounded by the discharge-zones 32.
  • stator-core I which are surrounded by the intake-zone or zones 33, are cooled by gas which flows inwardly to the air gap, through the intaking radial ventilating-spaces ID in the statorcore, this in-fiowing gas being supplied from the pressurized end-zones I5 through the pipes 34 to the intake-zone or zones 33 which surround the intaking ventilating-space or spaces I I] of the stator-core.
  • the intaking radial ventilating-spaceor spaces I0 provide a relatively high-pressure-drop communication-means between the intake-zone 33 and the air ap 5, while the discharging radial ventilating-spaces 9 provide a relatively low-pressure-drop communicatiommeans from said air gap 5 to the discharge zones 32.
  • a dynamo-electric machine comprising a stator member and a rotor member having an air gap therebetween, a substantially gas-tight housing enclosin said stator and rotor members, a filling of a gas bathing both said stator member and said rotor member within said housing, and a recirculation-means for said gas;
  • said recirculation-means including a cooler therein, and also including a fan-and-partition means for producing a pressurized end-zone at one end of the machine for maintaining a differential gas-pressure for recirculating the gas;
  • said rotor mem'- ber including a cylindrical rotor-core having winding-receiving rotor-slots, a rotor-winding having a cooling-duct means and coil-sides lying within said rotor-slots, said rotor-winding also having end-windings, said rotor member including a retaining ring surrounding said end-windings of
  • a dynamo-electric machine comprising a stator member and a rotor member having an air gap therebetween, a substantially gas-tight housing enclosing said stator and rotor members, a filling of a gas bathing both said stator member and said rotor member within said housing, and a recirculation-means for said gas; (a) said recirculation-means including a cooler therein, and also including a fan-and-partition means for producing a pressurized end-zone at one end of the machine for maintaining a differential gas-pressure for recirculating the gas; (2)) said rotor member including a cylindrical rotor-core having winding-receiving rotor-slots, a rotor-winding having a cooling-duct means and coil-sides lying within said rotor-slots, said rotor-winding also having end-windings, said rotor member including a retaining ring surrounding said end-windings of the rotor-

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
US282982A 1952-04-18 1952-04-18 Generator cooling Expired - Lifetime US2626365A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US282982A US2626365A (en) 1952-04-18 1952-04-18 Generator cooling
FR1077253D FR1077253A (fr) 1952-04-18 1953-04-15 Refroidissement de génératrices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1077253XA 1952-04-18 1952-04-18
US282982A US2626365A (en) 1952-04-18 1952-04-18 Generator cooling

Publications (1)

Publication Number Publication Date
US2626365A true US2626365A (en) 1953-01-20

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US (1) US2626365A (fr)
FR (1) FR1077253A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1020724B (de) * 1954-05-20 1957-12-12 Allis Chalmers Mfg Co Gasgekuehlte dynamoelektrische Maschine
US5177385A (en) * 1992-03-23 1993-01-05 Westinghouse Electric Corp. Air gap baffle ring for a dynamoelectric machine
US11309754B2 (en) * 2015-11-09 2022-04-19 Time To Act Limited Generator with series stators, and series rotors separated by annular collars with cooling vents

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1032382B (de) * 1955-05-26 1958-06-19 Siemens Ag Kuehlanordnung fuer die mit Hohlleitern ausgeruestete Erregerwicklung von Turbogeneratoren

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1020724B (de) * 1954-05-20 1957-12-12 Allis Chalmers Mfg Co Gasgekuehlte dynamoelektrische Maschine
US5177385A (en) * 1992-03-23 1993-01-05 Westinghouse Electric Corp. Air gap baffle ring for a dynamoelectric machine
US11309754B2 (en) * 2015-11-09 2022-04-19 Time To Act Limited Generator with series stators, and series rotors separated by annular collars with cooling vents

Also Published As

Publication number Publication date
FR1077253A (fr) 1954-11-05

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