US3358164A - Turbo-generator with direct cooling of the rotor winding - Google Patents

Turbo-generator with direct cooling of the rotor winding Download PDF

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Publication number
US3358164A
US3358164A US485500A US48550065A US3358164A US 3358164 A US3358164 A US 3358164A US 485500 A US485500 A US 485500A US 48550065 A US48550065 A US 48550065A US 3358164 A US3358164 A US 3358164A
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United States
Prior art keywords
gas
rotor
turbo
conductor
generator
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Expired - Lifetime
Application number
US485500A
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English (en)
Inventor
Mullner Friedrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Germany
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Bbc Brown Boveri & Cie
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Application filed by Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
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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

Definitions

  • the subject of the present invention is the embodiment of the rotor winding of turbo-generators with direct hollow-conductor gas-cooling.
  • direct cooling which currently is in general use in this art, means that the cooling gas is in direct communication with the copper heated by Joules losses.
  • the desired gas velocity can be attained with the available pressure.
  • the gas enters at the middle of the coil ends of the winding from both sides of the machine, and emerges again into the air-gap at the middle of the machine.
  • the distance which the cooling gas has to traverse is then equal to half the length of the coil end plus half the length of the slot part of the coil.
  • FIGURE 1 Another known solution is illustrated in FIGURE 1, where OO signifies the axis of the machine, and M-M the plane of the middle of the machine.
  • the active part of the rotor is disposed in the space between the planes E E and E-
  • the cooling gas enters the hollow conductors near the ends of the rotor at B and B, and splits up into two parallel streams, namely a cooling stream proceeding to the middle towards C and C, and a cooling stream through the coil ends of the winding, which emerges at A and A.
  • the paths through which gas fiow has to take place are shorter in this case than in the aforementioned arrangement, with the result that this type of cooling is more advantageous.
  • the changes in the direction of flow necessitate a complicated arrangement of pipe connections with corresponding pressure losses.
  • the present invention now relates to a turbo-generator with direct gas-cooling of the rotor winding, wherein the cooling gas enters the heads of the winding from both sides and emerges at the middle of the machine, but requires no incorporated elements for gas-distribution in the winding-end space.
  • this is done by providing two gas inlets on each side in the direction of the gas flow, one being disposed in the middle of the end of the winding, and the second shortly before the point where the end portion enters the rotor.
  • FIGURE 2 of the drawing A representative embodiment of the invention will now be more precisely explained with the aid of FIGURE 2 of the drawing.
  • the outlets lie in the middle of the machine and are designated by the apertures C and C.
  • the quantity of gas flowing in at A and B, and at A and B may ve divided up as desired by imparting correct values to the hydraulic resistances of the two inlet apertures.
  • suitable throttling can be provided at the inlet B whereby the gas velocity in the duct A-B can be set just high enough so that the maximum temperature at the end of this piece of conductor remains below a predetermined limit.
  • FIGURE 3 A further form of embodiment of the invention is shown in FIGURE 3.
  • the oblique inlet ducts at B and B set up an injector action which aspirates gas from the duct sections AB and AB.
  • throttling at B and B may be omitted, and the overall drop in pressure becomes still less than in the solution shown in FIGURE 2. Accordingly, with a given driving pressure, a still greater increase in exciter current and machine output power is possible.
  • a particularly favorable arrangement results if the conductors of the head of the winding are made wider than the conductors in the slot, as illustrated in FIGURE 3. This not only results in lower losses, but the thicker walls enable the oblique inlet ducts to be given a length which favors the injector effect.
  • a turbo-generator construction which includes a winding on the rotor member thereof constituted by hollow conductor turns having end portions at each end of the rotor and straight conductor portions in the slots of the rotor between said end portions, and wherein a gaseous coolant is passed through said hollow conductor turns, the improvement wherein two gas inlets are provided on each side of a conductor turn in the direction of the gas flow, and a gas outlet is provided at the middle of the straight portion of said conductor turn, the first of said gas inlets at each side being located in the middle of the end portion of the conductor turn and the second gas inlet at each side being located shortly before the point where the end portion enters the rotor.
  • each of said second gas inlets is throttled to an extent necessary to set up a gas flow in those portions of said conductor turn between the first and second gas inlets.
  • each of said second gas inlets is constituted as an obliquely set inlet orifice to establish an aspirating action on the gas flowing through said hollow conductor from the corresponding first gas inlet.
  • each of said second gas inlets References Cited is constituted as an ohliqnely set inlet orifice to estalo- I v UNITED STATES PATENTS llsh an aspiratlng action on the gas flowing through said 2 6O 1 hollow conductor from the corresponding first gas inlet, :3 3512;

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Windings For Motors And Generators (AREA)
  • Motor Or Generator Cooling System (AREA)
US485500A 1964-10-02 1965-09-07 Turbo-generator with direct cooling of the rotor winding Expired - Lifetime US3358164A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1282464A CH413076A (de) 1964-10-02 1964-10-02 Turbogenerator mit direkter Gaskühlung der Rotorwicklung

Publications (1)

Publication Number Publication Date
US3358164A true US3358164A (en) 1967-12-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
US485500A Expired - Lifetime US3358164A (en) 1964-10-02 1965-09-07 Turbo-generator with direct cooling of the rotor winding

Country Status (4)

Country Link
US (1) US3358164A (de)
BE (1) BE670327A (de)
CH (1) CH413076A (de)
GB (1) GB1096208A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0649211A3 (de) * 1993-10-14 1995-11-02 Matsushita Electric Industrial Co Ltd Induktionsmaschine und Verfahren zur Herstellung eines Läufers der Induktionsmaschine.
US20140183990A1 (en) * 2011-09-01 2014-07-03 Abb Technology Ag Arrangement and method for cooling an electric machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2760091A (en) * 1953-12-04 1956-08-21 Vickers Electrical Co Ltd Dynamo electric machine cooling
US2786951A (en) * 1953-05-18 1957-03-26 English Electric Co Ltd Dynamo-electric machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2786951A (en) * 1953-05-18 1957-03-26 English Electric Co Ltd Dynamo-electric machines
US2760091A (en) * 1953-12-04 1956-08-21 Vickers Electrical Co Ltd Dynamo electric machine cooling

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0649211A3 (de) * 1993-10-14 1995-11-02 Matsushita Electric Industrial Co Ltd Induktionsmaschine und Verfahren zur Herstellung eines Läufers der Induktionsmaschine.
US20140183990A1 (en) * 2011-09-01 2014-07-03 Abb Technology Ag Arrangement and method for cooling an electric machine

Also Published As

Publication number Publication date
GB1096208A (en) 1967-12-20
CH413076A (de) 1966-05-15
BE670327A (de) 1966-01-17

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