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WO2002035687A1 - Machine electrique a haute vitesse de rotation - Google Patents

Machine electrique a haute vitesse de rotation Download PDF

Info

Publication number
WO2002035687A1
WO2002035687A1 PCT/IB2001/001976 IB0101976W WO0235687A1 WO 2002035687 A1 WO2002035687 A1 WO 2002035687A1 IB 0101976 W IB0101976 W IB 0101976W WO 0235687 A1 WO0235687 A1 WO 0235687A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling
rotor
stator
air
machine
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.)
Ceased
Application number
PCT/IB2001/001976
Other languages
German (de)
English (en)
Inventor
Ralf Jakoby
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.)
General Electric Switzerland GmbH
Alstom NV
Original Assignee
Alstom Schweiz AG
Alstom Power NV
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 Alstom Schweiz AG, Alstom Power NV filed Critical Alstom Schweiz AG
Priority to AU2002210806A priority Critical patent/AU2002210806A1/en
Publication of WO2002035687A1 publication Critical patent/WO2002035687A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/10—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
    • H02K9/12—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing wherein the cooling medium circulates freely within the casing

Definitions

  • the present invention relates to the field of electrical machines. It relates to a high-speed electrical machine according to the preamble of claim 1.
  • the electrical power loss to be dissipated generally also reaches values in the rotor that require internal cooling.
  • a heat dissipation alone over the The air gap between the rotor and stator and over the end faces of the rotor is often not sufficient to comply with the temperature limit values determined by the respective insulation class.
  • a special position is occupied by machines that can be cooled with a medium under high pressure.
  • motors for driving pipeline compressors which are integrated in the natural gas pipeline and through which the pumped medium (methane) flows under a pressure between 40 and 70 bar. In this case, cooling of the rotor interior may not be necessary.
  • the object is achieved by the entirety of the features of claim 1.
  • the essence of the invention is to provide separate first and second cooling circuits for cooling the stator and rotor, which are formed or arranged symmetrically to the machine center.
  • an additional fan that can be regulated independently of the machine is preferably connected upstream or downstream of the cooler.
  • a preferred embodiment of the invention is characterized in that the cooling medium or the cooling air in the second cooling circuits for cooling the rotor flows in opposite directions from the end faces to the center of the rotor through axial channels accommodated in the rotor, and in order to compensate for the pressure losses occurring in the rotor flow Blading is attached to each end of the rotor.
  • the axial channels of the second cooling circuits are either offset from one another and extend from the end faces of the rotor essentially through the entire active part of the rotor and end at the end in the air gap. Or they extend from the end faces of the rotor to a radial gap which is arranged in the center of the machine and is connected to the air gap and opens into the radial gap.
  • the heated cooling medium (cooling air) which has emerged from the axial channels into the air gap (cooling air) is preferably at the front ends of the air gap via radial channels running through the stator within the second cooling circuits returned to the cooler.
  • the cooling is further simplified if the cooling medium or the cooling air in the second cooling circuits is passed through the winding overhangs before entering the rotor.
  • a further preferred embodiment of the invention is characterized in that the machine has a machine housing which exits the cooling medium or the cooling air in the first and second cooling circuits from the cooler into the interior of the machine housing, and in that the air gap on the end faces through seals is sealed. This considerably simplifies the construction of the cooling system.
  • FIG. 1 Another preferred embodiment of the invention is characterized in that radial cooling slots are provided in the stator for cooling the stator, which are divided into slot segments by a tangential segmentation, that each in the first cooling circuits by means of a collecting and distributing device arranged on the back of the stator Slot segment cold cooling medium or cold cooling air is fed from the cooler and heated cooling medium or heated cooling air is led away from the slot segment and back to the cooler, and that the cooling medium or the cooling air flows inside the slot segments in a segment half from the outside to the inside, below which Conductor rods of the stator is deflected and flows out of the slot segment again in a second segment half.
  • FIG. 1 shows a first preferred in a schematic longitudinal section
  • FIG. 2 shows, in a representation comparable to FIG. 1, a second preferred exemplary embodiment of an electrical machine according to the invention.
  • FIG. 3 in cross section an exemplary segmented stator cooling
  • FIG. 1 a first preferred embodiment of a high-speed electrical machine according to the invention is shown in a schematic longitudinal section.
  • the electrical machine 10 comprises a rotor 11, which is rotatably mounted in two bearings 15 and 16 with a rotor shaft 13 about an axis of rotation 17.
  • the rotor 11 is coaxially surrounded by a stator 12 provided on the end faces with winding heads 18 and 19, of which only the upper half is shown in FIG. 1 for the sake of simplicity.
  • Rotor 11 and stator 12 are separated from one another by an air gap 14.
  • a cooler 20, through which a cooling medium, preferably air, flows, is arranged in the upper area of the machine 10 within a machine housing 33.
  • the flow of the cooling air through the cooler 20 is brought about by an additional fan 21, which in the example shown is placed behind the cooler 20 in the flow direction, but can also be arranged in front of the cooler 20.
  • FIG. 1 An essential feature of the cooling concept shown in FIG. 1 is the use of largely independent first and second cooling circuits 26a, b and 27a, b for the rotor 11 and the stator 12.
  • the first two cooling circuits 26a and 26b as well as the two second cooling circuits 27a and 27b are constructed or arranged symmetrically to the machine center 43. In this way, each of the two components 11, 12 is supplied directly and optimally with cold air.
  • the additional fan (external fan) 21 which is connected downstream of the cooler 20, blows the cold air freely into the interior of the machine housing 33.
  • the inflow into the stator 12 takes place via the back of the stator, on which a corresponding collecting and distributing device 28 is provided.
  • the rotor 11 is supplied with cooling air by means of blading 29 or 30 attached to the end of the rotor shaft 13.
  • the air streams sucked in by the rotor 11 are previously passed over the winding overhangs 18, 19 in order to ensure reliable dissipation of the electrical power loss here as well.
  • the entry of the cooling medium into the rotor 11 is always a critical component in machines with high peripheral speeds. High differential speeds between the fluid and the rotating walls can cause severe flow separation and thus high pressure losses. These may exceed the pressure build-up of the commonly used external fans many times over, so that the mass flow required for cooling can ultimately not be fed into the rotor 11.
  • a radial or diagonal blading 29 or 30 attached to the rotor shaft 13 is attached to the end faces of the active rotor part.
  • the flow through and cooling of the rotor 11 takes place by means of axial channels 36, 37.
  • the cooling channels 36 and 37 emanating from the left and right side of the machine are offset from one another in the exemplary embodiment in FIG. 1, so that both partial flows of the first cooling circuits 26a, b are almost Flow through the entire active part and exit radially into the air gap 14 at the opposite machine end (see the corresponding flow arrows in the rotor 11 of FIG. 1).
  • This arrangement is particularly suitable for laminated rotors or rotors 11 consisting of disks and leads to a very homogeneous temperature distribution in the axial direction.
  • Another variant for the arrangement of the cooling channels in the rotor 11 is shown in the exemplary embodiment in FIG. 2.
  • the left and right axial channels 36 'and 37' need not be offset from one another.
  • the axial channels 36 ′, 37 ′ end in the machine center 43 and open into a radial gap 38, so that the rotor cooling air exits in the middle of the air gap 14.
  • the temperature of the rotor cooling air can be in the range of the permissible material temperatures of the stator 12, further use of the rotor cooling air for component cooling is not expedient. For this reason, the warm air is discharged through radial channels 34, 35 in the area of the press plates of the stator 12.
  • the effective cross-sectional area of these radial channels 34, 35 is to be dimensioned as large as possible in order to increase the pressure losses and also the heat exchange with the stator material minimize.
  • the cooling medium flows into ring collectors 22 and 23, respectively.
  • the ring collectors 22, 23 are in turn connected to the cooler 20 and the external fan 21 via pipes 24, 25.
  • a seal 31, 32 is required at both ends of the air gap 14. This is to prevent cold air from getting directly into the warm air collector (ring collector 22, 23).
  • the seals 31, 32 can be designed, for example, as labyrinth seals.
  • Various concepts can be used for cooling the stator 12, which, however, should have a seal to the air gap 14 as a "common denominator", so that the separation of the rotor and stator coolant flows is ensured.
  • the principle is shown here using the example of a tangential segmentation of the radial cooling slots of the stator.
  • axial chambering is also possible, as is usual in turbogenerator construction.
  • the cooling air is supplied to the stator radially into the interior of the stator in the case of the “tangential cooling” shown in FIG. 3 from the machine housing 33.
  • the cold air 41 flows in individual slot segments 40 past the conductor bars 39 to an inner boundary surface which seals the slot segments 40 with respect to the air gap 14.
  • This inner boundary can be created, for example, by a cylindrical insert ("air gap cylinder").
  • Below the conductor bars 39 the flow is deflected by 180 °.
  • the hot air 42 flows out of the stator 12 in a manner similar to the inflow.
  • the outflowing cooling medium is finally brought together in the collecting channels 28 of the collecting and distributing device 28 distributed over the circumference and introduced from there into the ring collectors 22, 23 which are arranged in the region of the press plates (cf. FIGS. 1 and 2).
  • the invention results in a high-speed electrical machine which is characterized by efficient dissipation of heat losses and extensive minimization of ventilation losses and which has considerable advantages in terms of operating costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

L'invention concerne une machine électrique (10) à haute vitesse de rotation qui comprend un rotor (11) monté rotatif qui est, tout en étant séparé par un entrefer (14), entouré de façon concentrique par un stator (12) comportant deux têtes de bobine (18, 19). Cette machine électrique est également pourvue de moyens (20, ..., 28) servant à refroidir le rotor (11) et le stator (12), avec lesquels un fluide de refroidissement, en particulier de l'air de refroidissement, est mis en circulation à travers le rotor (11) et le stator (12) et la chaleur absorbée par le fluide de refroidissement, c'est-à-dire par l'air de refroidissement, est prélevée dans un radiateur (20). Dans une telle machine, l'évacuation de la chaleur perdue est améliorée par le fait que le fluide de refroidissement, c'est-à-dire l'air de refroidissement, est conduit dans des premiers et des seconds circuits de refroidissement (27a, b ou 26a, b) de préférence parallèles, dans une large mesure indépendants les uns des autres, pour le stator (12) et le rotor (11), et que les premiers et seconds circuits de refroidissement (26a, b; 27a, b) sont formés ou disposés symétriquement par rapport au centre (43) de la machine.
PCT/IB2001/001976 2000-10-23 2001-10-23 Machine electrique a haute vitesse de rotation Ceased WO2002035687A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002210806A AU2002210806A1 (en) 2000-10-23 2001-10-23 High speed electric machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10052427.3 2000-10-23
DE2000152427 DE10052427A1 (de) 2000-10-23 2000-10-23 Schnelllaufende elektrische Maschine

Publications (1)

Publication Number Publication Date
WO2002035687A1 true WO2002035687A1 (fr) 2002-05-02

Family

ID=7660702

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/001976 Ceased WO2002035687A1 (fr) 2000-10-23 2001-10-23 Machine electrique a haute vitesse de rotation

Country Status (3)

Country Link
AU (1) AU2002210806A1 (fr)
DE (1) DE10052427A1 (fr)
WO (1) WO2002035687A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102265484A (zh) * 2008-12-23 2011-11-30 西门子公司 包含径向偏移冷却流的电机及冷却方法
CN119267269A (zh) * 2024-12-10 2025-01-07 富源空气悬浮系统(潍坊)有限公司 一种高压比风冷两级增压空气悬浮离心压缩机

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10246690A1 (de) * 2002-10-07 2004-04-22 Siemens Ag Belüftungssystem für Generatoren in Windkraftanlagen
DE102014223527A1 (de) * 2014-11-18 2016-06-02 Siemens Aktiengesellschaft Kühlung eines axialen Endbereichs eines Stators einer rotierenden elektrischen Maschine
EP3358725A1 (fr) 2017-02-07 2018-08-08 Siemens Aktiengesellschaft Machine électrique comprenant un dispositif de refroidissement de rotor indépendant, système de générateur et éolienne

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1524843A (fr) * 1966-06-20 1968-05-10 Gen Electric Dispositif de refroidissement pour machine dynamo-électrique
US4306165A (en) * 1978-07-28 1981-12-15 Hitachi, Ltd. Cooling system for rotary electric machines
US4845394A (en) * 1987-07-17 1989-07-04 Siemens Aktiengesellschaft Electric machine with a closed cooling loop
JPH1118369A (ja) * 1997-06-24 1999-01-22 Fuji Electric Co Ltd 全閉内冷形の回転電機

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1488566C3 (de) * 1965-07-01 1974-10-24 Loher & Soehne Gmbh, 8399 Ruhstorf Symmetrisch innenbelüfteter Elektromotor mit Kurzschlußkäfig
DE1684332A1 (de) * 1966-05-24 1970-01-15 Heinz Loechel Abbruch von Altbauten
US3684906A (en) * 1971-03-26 1972-08-15 Gen Electric Castable rotor having radially venting laminations
JPS5889046A (ja) * 1981-11-24 1983-05-27 Mitsubishi Electric Corp 回転電機の冷却装置
EP1032113A1 (fr) * 1999-02-25 2000-08-30 Lloyd Dynamowerke Gmbh Dispositif de refroidissement pour une machine électrique, notamment pour une machine à champ tournant
JP2000308311A (ja) * 1999-04-14 2000-11-02 Hitachi Ltd 回転電機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1524843A (fr) * 1966-06-20 1968-05-10 Gen Electric Dispositif de refroidissement pour machine dynamo-électrique
US4306165A (en) * 1978-07-28 1981-12-15 Hitachi, Ltd. Cooling system for rotary electric machines
US4845394A (en) * 1987-07-17 1989-07-04 Siemens Aktiengesellschaft Electric machine with a closed cooling loop
JPH1118369A (ja) * 1997-06-24 1999-01-22 Fuji Electric Co Ltd 全閉内冷形の回転電機

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 04 30 April 1999 (1999-04-30) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102265484A (zh) * 2008-12-23 2011-11-30 西门子公司 包含径向偏移冷却流的电机及冷却方法
US8686607B2 (en) 2008-12-23 2014-04-01 Siemens Aktiengesellschaft Electrical motor having radially offset cooling stream and cooling method
CN119267269A (zh) * 2024-12-10 2025-01-07 富源空气悬浮系统(潍坊)有限公司 一种高压比风冷两级增压空气悬浮离心压缩机

Also Published As

Publication number Publication date
AU2002210806A1 (en) 2002-05-06
DE10052427A1 (de) 2002-05-02

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