EP3158627A2 - Générateur de centrale électrique - Google Patents

Générateur de centrale électrique

Info

Publication number
EP3158627A2
EP3158627A2 EP15756630.8A EP15756630A EP3158627A2 EP 3158627 A2 EP3158627 A2 EP 3158627A2 EP 15756630 A EP15756630 A EP 15756630A EP 3158627 A2 EP3158627 A2 EP 3158627A2
Authority
EP
European Patent Office
Prior art keywords
fan
rotor
generator
air flow
central axis
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.)
Withdrawn
Application number
EP15756630.8A
Other languages
German (de)
English (en)
Inventor
Jan-Henrik Braam
Christoph Evers
Simon Gertz
Esteban Grau Sorarrain
Oliver Haberer
Markus Hagedorn
Christian Jäkel
Mario Koebe
Matthias Kowalski
Omer Mrkulic
Markus Mölders
Carolin Schild
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP3158627A2 publication Critical patent/EP3158627A2/fr
Withdrawn legal-status Critical Current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
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/08—Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • 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
    • H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
    • H02K7/1807—Rotary generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form

Definitions

  • the present invention relates to a generator for a power plant according to the preamble of claim 1 and to a method for cooling the generator according to the preamble of claim 11.
  • the connections between individual rods of the stator are made by means of a so-called winding head.
  • the rods In the winding head, the rods are guided in the tangential and radial directions such that the rods to be joined lie at the end of the winding head.
  • These rods must be electrically connected to each other, whereby the connection can be carried out in various ways.
  • the conductor ei ⁇ nes rod to bundle and per ⁇ wells to connect these bundles with the bundles of the counter-rod, which is called Bündelverscnies.
  • a third variant con- sists is to solder the conductor of a rod completely with ⁇ each other and perform the connection to the counter-rod solid with a tab. All types of connection have in common that the connections are made manually and subsequently an insulation must be applied. In the case of the use of tabs additional resistance losses, which lead to a heating of the winding head. Due to the elevated temperatures, there is a further increase of the electrical resistance and thus to a white ⁇ direct reduction of the efficiency of the generator.
  • the tab connection on the winding head constitutes the power-limiting component. Limitation is due to the heating of the tabs by the electrical resistance.
  • the tab connection has been designed with as thin insulation as possible to ensure good indirect cooling from the outside.
  • a thin insulation is only possible with adjacent tabs with low voltage difference.
  • a thick insulation is applied.
  • cooling takes place, inter alia, of the stator winding head by a fan on the rotor.
  • the fan show ⁇ blades are arranged radially to a central axis of the rotor and generate an axial air flow, which among other things cools the stator winding.
  • EP 0 643 465 A1 describes an air-cooled rotating electric machine.
  • JP S53 115 304 U describes a Maschi ⁇ ne with a winding head.
  • JP S58 145066 U describes a machine with a winding head.
  • the object of the invention is to provide a generator with improved cooling and a higher efficiency associated therewith.
  • the generator according to the invention with the features of claim 1 offers over the ⁇ be known from the prior art generators the advantage that a cooling air flow is generated by the fan, which reduces the thermal load on the tab connections or on the stator end winding by the Heat is dissipated more efficiently by a cooling air flow with radial and axial component. Due to the improved cooling of the end winding ⁇ size generators with higher efficiency and greater performance are possible with the same processing construction. By the measures set forth in the dependent claims advantageous refinements and improvements of the independent claim generator are possible.
  • the fan includes a first region on which an axially to a central axis of the rotor ⁇ directed cooling air stream generated, and a second region which produces a radially or diagonally oriented to the center ⁇ axis of the rotor cooling air flow.
  • the first region is kon ⁇ centrally formed around the central axis of the rotor, and the second region the first region at least as portion ⁇ , preferably concentrically surrounds.
  • a preferred embodiment variant has a blower with at least one fan blade, wherein this blower ⁇ scoop has a first portion which extends radially to a central axis of the rotor, and a second Ab ⁇ section, which at an angle of 10 ° to 90 ° to Center axis of the rotor runs.
  • Such a fan ⁇ shovel generates an axial flow of cooling air and, in its second portion a cooling air flow that is radially or diagonally configured for axial flow of cooling air in its first section. It when the second portion is formed at an angle of 30 ° to 75 ° to the central axis of the rotor, because it is rich generated by the second Be ⁇ a favorable, extending diagonally to the central axis of cooling air flow is particularly favorable. It is particularly preferred if the second section adjoins the first section of the fan blade in the radial direction from the central axis of the rotor on the outside. As a result, a largely axial cooling air flow is generated internally through the first region, while the second region generates a diagonal cooling air flow. In this way, a cooling air flow with a radial or diagonal and axial component can be generated with a fan or with a fan blade.
  • the Ge ⁇ blower blade is L-shaped. Thereby, formed at the distal end of the central axis of the fan blade having a radially oriented cooling air flow during an axi ⁇ ale flow is formed on the oriented to the central axis end of the blade cooling air.
  • an advantageous development consists in that the fan blade tapers in the direction from the central axis of the rotor to its end region facing away from the rotor. As a result, the moving masses can be kept low and material can be saved on the fan blade.
  • the fan has a first fan for generating an air flow axially to a central axis of the rotor and a second fan ⁇ wheel for generating an air flow radially or diagonally to the central axis of the rotor.
  • a blower having an axial fan and a centrifugal fan, a cooling air flow can also be generated to who, which also has an axial component in addition ⁇ a radial or diagonal component in a simple and cost effective manner.
  • the second fan is annular, wherein the first fan and the second fan are arranged concentrically with each other. This allows easy positioning and fixation the fan wheels reach each other, wherein the first fan is disposed in the interior of the annular second fan. It is particularly advantageous if a ring is formed on the fan, which represents an outer boundary of the first, inner fan, and an inner boundary of the second fan. Thus, the first fan and the second fan easily mounted in a common housing or prefabricated as an assembly, which reduces the Monta ⁇ geaufwand.
  • Fig. 2 shows a section of the generator, wherein a
  • Rotor with a fan blade and an air guide plate are shown.
  • Fig. 3 shows a fan blade of a device according to the invention
  • Fig. 4 shows the drive shaft of the rotor with fiction, ⁇ fan blades in 3D view.
  • Fig. 5 shows a combined radial / axial fan of a generator according to the invention in the front view.
  • Fig. 6 shows the combined radial / axial fan in the
  • a generator 10 is shown for a power plant.
  • the generator has a stator 20 in which a rotor 30 is arranged.
  • the rotor 30 has a drive shaft 31, which is rotatably mounted on two bearings 35,36. Through the drive shaft 31 of the rotor 30 extends a central axis 32.
  • the stator 20 is shielded on both sides by separating plates 25.
  • the stator 20 has a stator body 21 from which emerge at the end faces 27 current conductors 22 and form a winding head 24. To connect the current conductors 22 tabs 23 are provided at the ends, are connected to each other via the two adjacent conductor 22 in the winding head 24.
  • a fan 40 On the rotor 30, a fan 40 is fixed, which has in the ge ⁇ showed, simple embodiment fan blades 45, which are fixed as shown in Fig. 2 on the drive shaft 31 of the rotor.
  • the fan blades 45 are uniformly distributed over the circumference of the drive shaft 31 and extend in a plane with the separating plate 25, which laterally delimits the stator 20 and a suction side 28 of Geblä ⁇ ses 40 from a pressure side 29 of the blower 40 separates.
  • the fan blade 45 has a blade root 52, which is fixable in a groove 51 of the drive shaft 31.
  • a bracing element 53 is provided on the drive shaft 31, which is fi ⁇ xierbar by means of a screw 54 on the drive shaft 31 and thus securely fixed the blade root 52 of the fan blade 45.
  • the fan blade 45 has a first Be ⁇ rich 42, which extends radially or perpendicular to the central axis 32 of the rotor 30 and the drive shaft 31.
  • the ERS ⁇ te region 42 is adapted to generate a cooling air flow which axially to the central axis 32 of the rotor 30 runs ⁇ ver.
  • a second area 44 closes which concentrically surrounds the first region 42.
  • the second region 44 is designed to form a cooling air flow ⁇ at an angle of 5 ° to about 100 ° to the central axis of the rotor, which is hereinafter referred to as radial or diagonal cooling air flow.
  • the Geblä ⁇ seschaufel 45 has a first portion 47 which extends radially to the central axis 32 of the rotor 30, wherein a second portion connects in the radial direction towards the outside 48 which under an angle of approximately 30 ° to with ⁇ center axis 32 of the Rotor 30 runs. Alternatively, preferably between 30 ° and 60 ° are also ⁇ wider angle between about 5 ° and about 85 ° are conceivable.
  • the first section 47 generates the first, axially aligned region 42 of the cooling air flow
  • the second section 48 of the fan blade 45 generates the second diagonal or radial region 44 of the cooling air flow.
  • the fan blade 45 has a taper 46 on an end 49 facing away from the drive axle 31 in order to reduce pressure oscillations at the end 49 of the fan blade 45 and to concentrate the moving masses as close as possible to the rotor 31.
  • Fig. 4 the combination of drive shaft and fan is shown again in a perspective view.
  • Fig. 5 shows an alternative embodiment of the blower 40.
  • a first fan 50 for generating a cooling air flow in the axial direction, parallel to the central axis 32 of the rotor 30 angeord ⁇ net.
  • the first fan 50 is limited to the outside by a ring 70, wherein the ring 70 simultaneously forms an outer diameter of the first fan 50 and an inner diameter of a second fan 60 which is ringför ⁇ mig formed around the first fan 50 and a cooling ⁇ air flow radially or diagonally to the central axis 32 of the rotor 30 trains.
  • the ring 70 separates the axial cooling air ⁇ flow of the first fan 50, which is formed as an axial fan ⁇ from the cooling air flow of the second fan 60, which is designed as a radial fan.
  • FIG. 6 additionally shows the fan from FIG. 5 in a side view.
  • the drive shaft 31 rotates the rotor 30. It is sucked by the fan 40 air on the suction ⁇ page 28 of the separating plate 25 and conveyed to the pressure side 29th
  • the flow of air is characterized by the klei ⁇ NEN arrows in FIG. 1.
  • the air flows in axia ⁇ ler direction through openings in the end face 27 of the stator 20 in the generator 10 and between the drive shaft 31 of the rotor 30 and the stator 21, and flows on the Au noxseite of the stator 20 back.
  • OF INVENTION ⁇ dung solution according significantly better, direct arrival is achieved with cooling air flow 24 and thus realizes a better cooling of the winding head 24 of the winding heads.
  • a different cooling medium can be used instead of air.

Landscapes

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

Abstract

L'invention concerne un générateur (10) de centrale électrique ainsi qu'un procédé de refroidissement du générateur. Le générateur possède un stator (20) et un rotor (30). Le stator (20) entraîne des conducteurs électriques (22). Les conducteurs électriques (22) forment une tête de bobine (24) à au moins une extrémité du stator (20) et le générateur (10) comporte un ventilateur (40) qui refroidit cette tête de bobine (24). Le ventilateur (40) produit un courant d'air de refroidissement dirigé sur la tête de bobine (24), lequel comprend une composante axiale et une composante radiale.
EP15756630.8A 2014-09-08 2015-08-27 Générateur de centrale électrique Withdrawn EP3158627A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14183928.2A EP2993767A1 (fr) 2014-09-08 2014-09-08 Générateur pour une centrale
PCT/EP2015/069606 WO2016037859A2 (fr) 2014-09-08 2015-08-27 Générateur de centrale électrique

Publications (1)

Publication Number Publication Date
EP3158627A2 true EP3158627A2 (fr) 2017-04-26

Family

ID=51485519

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14183928.2A Withdrawn EP2993767A1 (fr) 2014-09-08 2014-09-08 Générateur pour une centrale
EP15756630.8A Withdrawn EP3158627A2 (fr) 2014-09-08 2015-08-27 Générateur de centrale électrique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP14183928.2A Withdrawn EP2993767A1 (fr) 2014-09-08 2014-09-08 Générateur pour une centrale

Country Status (5)

Country Link
US (1) US20170257007A1 (fr)
EP (2) EP2993767A1 (fr)
JP (1) JP2017530676A (fr)
CN (1) CN106688164A (fr)
WO (1) WO2016037859A2 (fr)

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JP6692465B2 (ja) * 2017-02-02 2020-05-13 三菱電機株式会社 回転電機
EP3460206A1 (fr) * 2017-09-21 2019-03-27 Siemens Aktiengesellschaft Procédé de fonctionnement d'une turbine à vapeur
EP3534514A1 (fr) * 2018-03-02 2019-09-04 Siemens Aktiengesellschaft Enroulement de bobine pour un stator d'une machine tournante électrique
JP2019154197A (ja) * 2018-03-06 2019-09-12 本田技研工業株式会社 回転電機
WO2019234771A1 (fr) * 2018-06-07 2019-12-12 Mavel S.R.L. Rotor pour une machine électrique comprenant des éléments de refroidissement à l'air et machine électrique comprenant ledit rotor
JP2020162306A (ja) * 2019-03-27 2020-10-01 株式会社明電舎 回転電機
KR102050810B1 (ko) * 2019-06-13 2019-12-04 터보윈 주식회사 냉각 열평형이 가능한 고속 터보기계
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Also Published As

Publication number Publication date
JP2017530676A (ja) 2017-10-12
CN106688164A (zh) 2017-05-17
WO2016037859A2 (fr) 2016-03-17
EP2993767A1 (fr) 2016-03-09
US20170257007A1 (en) 2017-09-07
WO2016037859A3 (fr) 2016-07-14

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