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WO2017009001A1 - Machine électrique - Google Patents

Machine électrique Download PDF

Info

Publication number
WO2017009001A1
WO2017009001A1 PCT/EP2016/064076 EP2016064076W WO2017009001A1 WO 2017009001 A1 WO2017009001 A1 WO 2017009001A1 EP 2016064076 W EP2016064076 W EP 2016064076W WO 2017009001 A1 WO2017009001 A1 WO 2017009001A1
Authority
WO
WIPO (PCT)
Prior art keywords
electric machine
stator
axial end
space
gas
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/EP2016/064076
Other languages
English (en)
Inventor
Claes FRÖLING
Erik Bergman
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.)
Alstom Transportation Germany GmbH
Original Assignee
Bombardier Transportation GmbH
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 Bombardier Transportation GmbH filed Critical Bombardier Transportation GmbH
Priority to EP16729603.7A priority Critical patent/EP3323193A1/fr
Priority to CN201680041111.4A priority patent/CN107836073A/zh
Publication of WO2017009001A1 publication Critical patent/WO2017009001A1/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
    • H02K9/08—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
    • 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

Definitions

  • the present invention relates to an electric machi ne comprising a stator having a stator body with a stator winding configured to electrically create a plurality of stator poles disposed around the inner periphery of the stator body,
  • a rotor rotatably disposed within said stator and havi ng a rotor body
  • means configured to sealingly enclose at least said rotor and the stator windi ng comprising an end shield arranged at each axial end of the machine and at each said end enclosing a space filled with gas, delimited by the end shield and an axial end of said rotor body and surrounding a respective axial end portion of the stator winding , and
  • waiters arranged on each axial end of the rotor body for mixing gas trapped i n the respective said space upon rotation of the rotor body.
  • Such an electric machi ne may operate as motor and/or generator, although this disclosure will focus mainly on the operation thereof as a motor.
  • the present i nvention is particularly applicable to electric machines in the form of motors of the type defi ned i n the introduction for creati ng a traction force of a track-bound vehicle, especially a rail vehicle, and this application of such an electric machine will mainly be discussed below without for that sake restricting the i nvention thereto.
  • a motor may of course function as a generator when braking the vehicle.
  • Such an electric machi ne is totally enclosed , which means that the i nternal gas, normally air although other gases are possible, but air will hereinafter be considered as said gas, is "trapped" inside the electric machi ne and will theoretically never escape said space unless the machi ne is disassembled (in practise it may leak out very slowly and fi nally be replaced by new air, but that will take a very long time compared to for an open machine).
  • the reason for enclosing the rotor and the stator windings of the electric machine in this way is to protect these parts against dirt and contaminations when the machine is used in an environment in which the machi ne is exerted thereto, such as in an underground train .
  • duri ng operation of the electric machine heat is created by losses mainly in the stator body, the rotor body and the stator windi ngs resulting i n a temperature increase of the air trapped in said space.
  • the temperature is the parameter restricting the maximum power of operation of an electric machine of this type when it functions as a motor and the maximum power which may be delivered thereby i n the case of generator function , i n which the i nsulation layers of the stator windings and the bearings for the shaft of the electric machi ne are the components most sensitive to high temperatures.
  • the object of the present invention is to provide an electric machine of the type defined in the introduction being improved in at least some aspect with respect to such electric machines already known .
  • the inventor has found out that in absence of such a member in said space the wafters on the rotor body will rotating the gas around in tangential direction and also pushing the gas in radial direction , but since there is a low pressure region radially internally of the wafters gas needs to flow back i nto this region and the same gas is then rotating back around the wafters preventing the gas from reaching further radially for being mixed with cooler gas.
  • the arrangement of said member means that less heat is transferred to the bearing through the end shield and more heat will be transferred through the radially peripheral walls of the end shield .
  • each said member extends in said space from the region of said wafters, which is located radially internally of an axial end portion of the stator winding , radially outwardly towards and at least to the region of the axial end of said windi ng so as to guide gas moved by said waiters along the member from said region of said waiters and at least to the axial end of the winding .
  • each said member extends past the axial end of the stator winding and further around the axial end portion of the stator windi ng and i n the direction of the opposite axial end of the machi ne i nto an annual portion of said space peripherally surroundi ng the axial end portion of the windi ng.
  • said member is configured to guide gas moved by said waiters upon rotation of the rotor body from the region of said waiters along an axial end portion oi the stator winding and back to said region while ilowing radially along internal axial end walls of said end shield .
  • said member comprises a portion iormi ng an obstacle preventing gas influenced by said waiters upon rotation oi the rotor body to carry out a movement in a circular path to circulate back to said waiters and instead guide this gas iurther away from the waiters towards the radial periphery of said space.
  • an obstacle will assist in obtaini ng the movement of the gas inside said space desired .
  • each said member is made of a shaped plate, which may according to another embodiment of the invention be made of steel .
  • the electric machine comprises an impeller with blades arranged on one end of the rotor body to conduct air in a path externally of said stator body and peripheral parts of said end shields delimiting an annular portion of each said space surrounding an axial end portion of said wi nding for external cooling of the stator body and parts of said end shields upon rotation of said rotor body.
  • said impeller is arranged on the non-driven end of a shaft of the machi ne to which said rotor body is secured .
  • the electric machine is a permanent magnet machi ne and said rotor body is provided with a pl urality of permanent magnets, and as an alternative the electric machine may be an asynchronous electric machine.
  • the invention also relates to a track-bound vehicle electric machine having the features of the electric machine according to the present invention as defined above.
  • the advantages of such a track-bound vehicle electric machine appear clearly from the above discussion .
  • the i nvention also relates to a driving arrangement for a track- bound vehicle comprising an electric machine according to the invention , use of an electric machine according to the i nvention in a driving arrangement for generati ng a traction force of a track- bound vehicle as well as a track-bound vehicle having a driving arrangement for generating a traction force of the vehicle includi ng at least one electric machi ne according to the present invention .
  • the advantageous features and the advantages of such a driving arrangement, use and vehicle appear clearly from the above discussion of the different embodiments of an electric machine according to the present invention .
  • Fig . 1 shows an electric machine of the type to which the present i nvention belongs in a longitudinal cross-section view
  • Fig . 2 is a perspective view of the electric machine shown i n
  • Fig . 3 is an enlarged cross-section view of a part of an axial end of an electric machine of the type shown in Fig . 1 and 2 according to the prior art
  • Fig . 4 is a view corresponding to Fig . 3 for an electric machine accordi ng to an embodiment of the present invention .
  • a track-bound vehicle electric machine of the type to which the present invention relates is shown i n Figs. 1 and 2.
  • the electric machine has a stator 1 with a stator body 2 with a stator winding 3 received in stator ducts not shown in the figure in the internal wall of the stator body and having axial end portions 4 of the coil forming the stator windi ng extendi ng axially out of the stator body 2 on the both sides thereof.
  • a rotor 5 with a rotor body 6 is rotatably disposed within the stator by bei ng secured to a shaft 7 extending axially through the electric machine and having a non-driven end 8 and a driven end 9, which may be connected to a gearbox of the vehicle V.
  • the shaft 7 is received in beari ngs 10, 1 1 in an end shield 12, 13 arranged at each axial end of the machine, and this end shield has an end wall 14 and a lateral peripheral wall 15 fixed tightly to an axial end of the stator body 2 so as to enclose a space 16, 1 7 filled with air surrounding a respective axial end portion 4 of the stator winding .
  • Waiters 18 are arranged on each axial end 19 of the rotor body for mixing air trapped in the respective space 16, 1 7 upon rotation of the rotor body.
  • An impeller 20 with blades (not shown) is arranged on the non- driven end 8 of the rotor body to rotate upon rotation of the rotor body and by that conduct air from the exterior through a central opening 21 of an end flange 22 of the machine in a path externally of the stator body and the lateral peripheral walls of the end shields as indicated by arrows A in Fig . 1 (see also Fig . 3 and 4). This results in an external cooling of the stator body 2 and parts of the end shields upon rotation of the rotor body.
  • Fig. 3 is an enlarged cross-section view of a part of an axial end of the electric machine shown in Fig 1 .
  • a waiter 18 secured to an axial end of the rotor body 6 in the form of a short-circuit ring is indicated by a dashed line. It is shown how a space 16 in which air is trapped is delimited by an end wall 14 and a lateral peripheral wall 15 of the end shield 12, an axial end 27 of the stator body 2 and the axial end 23 of the rotor body.
  • This space 16 has an annular portion 24 surrounding the axial end portion 4 of the stator winding and located directly internally of the end shield wall 15 being externally cooled by rotation of the impeller 20 as indicated by the arrow A.
  • Fig . 4 is a view similar to that oi Fig. 3 oi an electric machine according to an embodiment oi the invention , in which a member 30 is arranged in each space 16 and coniigured to direct air moved by the waiters 18 upon rotation oi the rotor body radially towards the radial periphery oi the space ior mixing this air with air in a peripheral portion of the space.
  • the member is here made by a shaped steel plate having at one end a portion 31 forming an obstacle preventing air influenced by the waiters upon rotation oi the rotor body to carry out a movement in a circular path, as shown in Fig .
  • the member 30 extends past the axial end 32 of the stator winding and further around the axial end portion 4 of the stator wi nding and in the direction of the opposite axial end of the machine i nto said annular portion 24 of the space peripherally surrounding the axial end portion of the winding .
  • the member 30 is configured to guide air moved by the waiters along and around it as shown through the path B with arrows.
  • a reduction of the temperature of these parts of the stator winding by about 10 K may double the life time of the stator windings, whereas the maintenance intervals of the bearings for lubrification thereof may be prolonged substantially by a similar reduction of the temperature of the bearings duri ng operation of the electric machine.

Landscapes

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

Abstract

L'invention porte sur une machine électrique qui comprend un stator (1) et un rotor (5) disposé rotatif à l'intérieur du stator. Au moins le rotor et des enroulements (3) du stator sont enfermés hermétiquement par un flasque (12) disposé à chaque extrémité axiale de la machine dans un espace (16) rempli de gaz. Des dispositifs de soufflage (18) sont disposés sur le rotor pour mélanger un gaz piégé dans ledit espace. Un élément (30) est agencé dans ledit espace (16) pour diriger le gaz déplacé par les dispositifs de soufflage (18) au moins partiellement radialement vers la périphérie radiale de l'espace afin de mélanger ce gaz avec du gaz présent dans une partie périphérique dudit espace. (Drawing_references_to_be_translated)
PCT/EP2016/064076 2015-07-13 2016-06-17 Machine électrique Ceased WO2017009001A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16729603.7A EP3323193A1 (fr) 2015-07-13 2016-06-17 Machine électrique
CN201680041111.4A CN107836073A (zh) 2015-07-13 2016-06-17 电机

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1551021-7 2015-07-13
SE1551021A SE539576C2 (en) 2015-07-13 2015-07-13 An electric machine

Publications (1)

Publication Number Publication Date
WO2017009001A1 true WO2017009001A1 (fr) 2017-01-19

Family

ID=56132964

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/064076 Ceased WO2017009001A1 (fr) 2015-07-13 2016-06-17 Machine électrique

Country Status (4)

Country Link
EP (1) EP3323193A1 (fr)
CN (1) CN107836073A (fr)
SE (1) SE539576C2 (fr)
WO (1) WO2017009001A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021028192A1 (fr) * 2019-08-09 2021-02-18 Zf Friedrichshafen Ag Moteur électrique doté d'un élément de guidage d'air

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2185740A (en) * 1937-11-01 1940-01-02 Allis Louis Co Dynamo-electric machine
JPS5674970U (fr) * 1979-11-13 1981-06-19
JPH053643A (ja) * 1991-06-27 1993-01-08 Fuji Electric Co Ltd 全閉外扇形回転電機
EP1100182A1 (fr) * 1999-11-12 2001-05-16 General Electric Company Moteurs électriqes réfroidis par ventilateur avec dissipation thermique améliorée

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5325566B2 (ja) * 2008-12-24 2013-10-23 三菱電機株式会社 回転電機
DE102013200105A1 (de) * 2012-10-09 2014-04-24 Robert Bosch Gmbh Kühlung für Stirnräume einer geschlossenen elektrischen Maschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2185740A (en) * 1937-11-01 1940-01-02 Allis Louis Co Dynamo-electric machine
JPS5674970U (fr) * 1979-11-13 1981-06-19
JPH053643A (ja) * 1991-06-27 1993-01-08 Fuji Electric Co Ltd 全閉外扇形回転電機
EP1100182A1 (fr) * 1999-11-12 2001-05-16 General Electric Company Moteurs électriqes réfroidis par ventilateur avec dissipation thermique améliorée

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021028192A1 (fr) * 2019-08-09 2021-02-18 Zf Friedrichshafen Ag Moteur électrique doté d'un élément de guidage d'air
CN114207999A (zh) * 2019-08-09 2022-03-18 Zf腓特烈斯哈芬股份公司 具有空气导引部件的电马达

Also Published As

Publication number Publication date
SE1551021A1 (en) 2017-01-14
CN107836073A (zh) 2018-03-23
SE539576C2 (en) 2017-10-17
EP3323193A1 (fr) 2018-05-23

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