EP2162969A2 - Rotor for a generator - Google Patents

Rotor for a generator

Info

Publication number
EP2162969A2
EP2162969A2 EP20080774242 EP08774242A EP2162969A2 EP 2162969 A2 EP2162969 A2 EP 2162969A2 EP 20080774242 EP20080774242 EP 20080774242 EP 08774242 A EP08774242 A EP 08774242A EP 2162969 A2 EP2162969 A2 EP 2162969A2
Authority
EP
European Patent Office
Prior art keywords
profile
characterized
conductor elements
rotor according
keyway
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Withdrawn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
EP20080774242
Other languages
German (de)
French (fr)
Inventor
John Lindh
Andrew John Holmes
Benjamin Gugerli
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 Technology GmbH
Original Assignee
General Electric Technology 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
Priority to CH10572007 priority Critical
Application filed by General Electric Technology GmbH filed Critical General Electric Technology GmbH
Priority to PCT/EP2008/057990 priority patent/WO2009003869A2/en
Publication of EP2162969A2 publication Critical patent/EP2162969A2/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/46Fastening of windings on the stator or rotor structure
    • H02K3/48Fastening of windings on the stator or rotor structure in slots
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/22Windings characterised by the conductor shape, form or construction, e.g. with bar conductors consisting of hollow conductors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/32Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium

Abstract

Disclosed is a rotor (10) for a generator, comprising a cylindrical rotor member (11) with axial winding grooves (12) which are arranged so as to be distributed along the circumference and inside which conductor elements (14) are disposed that extend in an axial direction. A cooling medium is fed to the conductor elements (14) along the axis at periodic intervals from a bottom groove (13) located on the bottom of the winding groove (12). Undulate springs (17) are provided below the conductor elements (14). Said undulate springs (17) each press the conductor elements (14) of a winding groove (12) against a groove wedge (19) that closes the winding groove (12) at the top. In order to obtain an adequate spring force in such a rotor, the undulate springs (17) are placed on the bottom of the bottom groove (13), and the spring force thereof acts upon the superimposed conductor elements (14) via an axial profiled section (16) located inside the bottom groove (13).

Description

DESCRIPTION

ROTOR FOR A GENERATOR

TECHNICAL FIELD

The present invention relates to the field of rotating machines. It relates to a rotor for a generator according to the preamble of claim 1.

STATE OF THE ART

From EP-A1 -0652623, a rotor for a turbo-generator is known in which arranged in the winding grooves conductor elements are designed as hollow conductors and are cooled by a gaseous cooling medium flowing through the internal channels of the conductor elements. In the bottom of the winding slot, a keyway is inserted, is supplied to the cooling medium and from there fed radially upwards in the cooling channels of the individual conductor elements. Below the stack of the conductor elements wave springs are arranged which urge the stack of the conductor elements from below against the slot wedge, which closes the winding groove above.

In EP-A1 -1455433 a similarly constructed rotor of a turbine generator is described, the conductor elements each having two parallel axial cooling channels arranged in alternating, overlapping each other and fluidly separate channel sections are divided. The channel sections are acted upon at one end with a zoom out by a keyway cooling medium is discharged after flowing through the channel portion in each case radially outwards. Such as "forward flow" designated cooling concept is characterized in that the cooling medium is fed in at individual points alternately in the two cooling channels of the conductor elements.

It is desirable that also be used in the described "Forward Flow" cooling in the winding slots beneath the circuit elements corrugated springs which radially press and ensure that the coil (ie the content of the winding groove) is compressed in all operating states of the winding outwards . the use of springs has in particular the following advantages:

• rather large deviations in the geometric dimensions (height) of the components in the winding groove (conductor elements, insulation etc.) can be tolerated. • There is no need to adjust the thickness of all top packages, thereby reducing costs and time savings.

• All upper circuit elements are more or less on the same radius. This results in a smooth transition of the upper packing for the isolation of the winding head. • The compression of the coil slot content ensures that there is little or no relative movement between the individual windings and so the risk of circuits between the turns or earth faults is reduced.

However, the use of located under the conductor elements feathers in the "forward flow" cooling meets with difficulties: Because of the great weight of the conductive elements, the spring force of the springs have to be very big, but this is not possible when the springs directly beneath the stack of. conductor elements are arranged, because only short spring sections between adjacent inlets for the cooling medium of the keyway can be used in the cooling channels, and so the summed total length of all

Spring sections represents only a fraction of the total length of the winding. This relationship deteriorated even further, because a certain creepage distance of the springs must be ensured in addition, so that the effective axial length of the spring is less than 50% of the total length of the groove.

A further disadvantage is the need to per winding groove provided a plurality of individual springs and installed, which leads to a plurality of spring elements 100 per rotor.

It would be conceivable to increase the spring force by increasing the material thickness. However, the springs currently used already lie with their thickness in the calculated stress near the yield strength, and an increase in material thickness would still increase the load.

The same problems exist not only in a "forward flow" cooling but also with rotors having a radial cooling, in which along the axis at periodic intervals, a cooling medium is passed in radial cooling channels through the winding, which is taken in by a in the bottom of the winding slot axial keyway is guided. SUMMARY OF THE INVENTION

It is an object of the invention to provide a rotor which is on the one hand equipped with a cooling system, the zoom leads the cooling medium by a keyway and feeds at periodic intervals from the keyway in the winding, and on the other hand the advantages of a spring biased tab of the winding uses ,

The object is achieved by the totality of the features of claim 1. The essence of the invention consists in the bottom of the keyway to arrange the corrugated springs and acting with its spring force on a valve disposed in the keyway, axial profile on the overlying conductive elements. Since the springs are not arranged longer between the keyway and to be cooled conductive elements, they do not need consideration of the inlet openings for the cooling medium to take and therefore can be manufactured with a large axial length and used. Access to the inlet ports is achieved by a corresponding configuration on the upper side of the profiles, while the underside of the profile, against which the springs can be made axially therethrough.

This applies in particular when the conductor elements having axial cooling ducts inside, which are subdivided into individual, mutually fluidly separate axial channel sections, which are traversed by the supplied cooling medium which is monosubstituted in the channel portion at one end each and at the other end of exits the channel section again, and having cooling channels when the circuit elements respectively adjacent, separate, which are alternately divided into overlapping channel sections.

According to one embodiment of the invention, the profile of a closed quadrangular hollow profile is formed. Another embodiment is characterized in that the profile is divided by a extending in the radial direction center wall into two chambers, and that different chambers through the cooling channels of the conductor elements are supplied with cooling medium.

Preferably, the profile fills the keyway cross-section of largely.

According to a further development of the invention, the keyway has a rectangular cross-section. This is especially the case if - is supported, the stack of printed circuit elements on a lying above the keyway insulating strip - as shown in Figure 3 of the aforementioned EP-A1 -0652623..

Another development is characterized in that the keyway is having a downwardly tapered trapezoidal cross section. In this way, the mechanical stress concentrations in the rotor teeth can be reduced.

However, it is also possible to form the profile of a double-T-profile, whereby material can be saved in profile.

The profile can be composed of an electrically insulating material. It may then not be part of the winding.

but the profile may also consist of a metal, and then - be part of the winding - depending on the design of the insulation in the winding groove.

In particular, the profile may be made of aluminum and be extruded. For this, well-known and cost-effective production methods are suitable.

but the profile may also consist of copper or other material with good electrical conductivity. If an electrically conductive profile does not form part of the winding, the profile is located outside the insulation surrounding the conductor elements in the winding slots.

Otherwise, the profile of the insulation is enclosed.

BRIEF EXPLANATION OF THE FIGURES

The invention will be explained in more detail with reference to exemplary embodiments in conjunction with the drawing. Show it

Fig. 1 shows the cross section through a winding of a rotor having a rectangular keyway and a rectangular hollow profile according to a preferred embodiment of the invention;

FIG. 2 shows two further embodiments of the rotor according to the invention having a trapezoidal keyway, whereby in one case (Fig. 2a) a double-T-profile, in the other case (Fig. 2b) is a square hollow profile for use in two part figures; and

Fig. 3, the insulation of the conductor elements does not surround into two figures, two further embodiments of the rotor according to the invention having a trapezoidal keyway and a divided by a center wall square hollow profile, whereby in one case (Fig. 3a), the profile with, while (in the other case FIG. 3b), the hollow profile is enclosed with. WAYS OF IMPLEMENTING THE INVENTION

In Fig. 1 in a section of the cross-section through a winding of a rotor having a rectangular keyway and a rectangular hollow profile is shown according to a preferred embodiment of the invention. The rotor 10 has in conventional manner a cylindrical rotor body 1 1, which is rotatably supported about a machine axis, not shown, and is concentrically enclosed by a (also not shown) stator.

are distributed over the circumference of the rotor 10 in the rotor body 1 1 radial

Winding grooves 12 recessed, which accommodate the rotor winding which is formed from individual bar-shaped extending in the axial direction of conductor elements fourteenth The conductor members 14 are arranged to form a plurality of superposed in the winding groove 12 and fill the winding groove 12 largely. They are surrounded by an insulation 18, which the conductor members 14 and the

Winding of the rotor body 11 are electrically isolated. The winding groove 12 is closed at the top by a slot wedge 19th Between the slot wedge 19 and the upper conductor member 14, an intermediate layer 20 is provided.

. In the embodiment of Figure 1, each conductor element 14 inside a pair of parallel side by side in the axial direction of cooling channels 15a and 15b, which - as described in the aforementioned document EP-A1 -1455433 - axially into individual, direction behind the other and from each other in terms of flow separate axial channel sections are divided, through which a cooling medium. The individual channel sections of the two cooling channels 15a and 15b are offset from each other and arranged to overlap.

The cooling medium, for example air, is fed from below via a sunken into the bottom of the winding groove 12 a keyway 13, occurs via respective intake ports at one ends of the channel sections, flows through the channel portions and at the other ends of the channel section to the top and through the out slot wedge outwards.

The stack of the conductor elements 14 is pressed from below by a spring force against the slot wedge 19th The spring force is generated by wave springs 17, which are arranged below the conductor elements fourteenth New is that the wave springs 17 act no longer directly or via an intermediate position on the lowermost conductor element 14, but the practically completely fills via an inserted into the keyway 13 profile 16, the keyway. 13 In the example of Fig. 1, the keyway 13 and, accordingly, the profile 16 have a rectangular cross-section. The profile 16 is designed as a hollow profile with uniform wall thickness and divided by a central partition 25 into two chambers 26a and 26b. The left chamber 26a is left cooling channels allocated 15a for supplying the cooling medium, the right chamber 26b corresponding to the right cooling channels 15b. The profile 16 may be an extruded aluminum profile. but it may also consist of another metal such as Cu are made, or of a mechanically stable, electrically insulating material. If the profile 16 consists of an electrically highly conductive material, it may be included as a conductor element in the rotor winding. This is shown in Fig. 1, the case where the insulation 18 of the conductor elements 14 surrounds the profile 16 in the keyway 13.

The wave springs 17 are arranged on the bottom of the keyway 13 and act on the intermediate profile 16 on the stack of the conductor elements 14 with its spring force. Since the profile 16 only needs to have on the upper side recesses at the locations where the inlet openings for the

Channel sections are arranged, the underside of the profile 16 may be formed continuously. Accordingly, the wave springs can be formed continuously on the bottom of the profile 17, so that the axial length of the winding groove 12 and the keyway 13 for the generation of the spring force can be nearly completely utilized. In Fig. 1, an intermediate layer 21 is provided directly below the profile 16, which is enclosed by the insulation 18. The wave spring 17 is placed under it. On the basis of Fig. 1 it can be seen that the cross-sectional area for the flow of the cooling medium in the keyway 13 by the inserted profile 16 is reduced with its wall thickness. The reduction can for example be about 30%. In order to achieve a compensation here can be either the keyway 13 are made wider or to receive a downwardly tapered trapezoidal cross section, as shown in the examples of FIGS. 2 and 3.

Fig. 2 2 a and 2 b show two further embodiments of the rotor, in one case (Fig. 2a) are available in two part figures according to the invention again, equipped with a trapezoidal keyway 13 'as a profile 22, a double-T-profile, in the other case (Fig. 2b) is used as a profile 23 a simple rectangular hollow profile with no central wall. In both cases, the profile is not included 22 and 23 of the insulation. the spring force is in the case of Fig. 2a transmitted exclusively via the central web of the profile 22, in the case of Fig. 2b exclusively through the outer walls. In both cases, the reduction of the available flow cross section is smaller than in the example of FIG. 1 or the examples of Fig. 3, in each of which an (additional) means wall 25 is present.

In the examples shown in Fig. 3 embodiments, a quadrangular profile 24 with a dividing center wall in the trapezoidal keyway is analogous to Fig. 1 used 13 'and adapted to this cross-section. In Fig. 3a, the profile 24 - as shown in Fig. 2 - not covered by the insulation 18. In Fig. 3b, the profile 24 against it by the insulation 18 is included.

The main function of the profile 'inserted into the keyway 13 and 13, respectively 16, 22, 23, 24 is to transfer the radially directed spring force of the wave spring 17 to the lowermost semiconductor element 14. In addition, however, the profile can also for guiding the cooling medium flow be used in a predetermined manner. LIST OF REFERENCE NUMBERS

10 rotor

1 1 Rotor body 12 winding groove

13.13 'keyway

14 conductor element

15 cooling channel

16 profile 17 wave spring

18 insulation

19 slot wedge

20.21 Liner

22,23,24 profile 25 central wall

26a, b Kammer

Claims

1. A rotor (10) for a generator, which rotor (10) comprises a cylindrical rotor body (1 1) distributed over the periphery are arranged axial
Winding slots (12) in which the conductor elements (14) are arranged, which extend in the axial direction, along the axis at periodic intervals the conductor elements (14) a cooling medium from a the bottom of the coil slot (12) arranged in a keyway (13, 13 ') is supplied, and wherein below the circuit elements ((14) corrugated springs 17) are provided which respectively press the conductor elements (14) of a winding groove (12) against a the winding groove (12) above final slot wedge (19), characterized in that the corrugated springs (17) at the bottom of the keyway (13, 13 ') are arranged and with its spring force into the keyway (13, 13' arranged), axial profile (16, 22, .., 24) to the act overlying conductor elements (14).
2. Rotor according to claim 1, characterized in that the conductor elements (14) (15a, b) inside axial cooling channels have, divided into individual, mutually fluidly separate axial channel sections, which are traversed by the supplied cooling medium, which in each case at mono- one end into the channel section and emerges at the other end of the channel section again, and in that the conductor elements (14) each juxtaposed, separate cooling channels (15a, b) which are alternately divided into overlapping channel sections.
3. Rotor according to claim 1 or 2, characterized in that the profile (16, 23, 24) is designed as a closed quadrangular hollow profile.
4. Rotor according to claim 3, characterized in that the profile (16, 23, 24) by extending in the radial direction of the center wall (25) in two
Chambers (26a, b) is divided, and that through the chambers (26a, b) have different cooling channels (15a, b) are supplied to the conductor elements (14) with cooling medium.
5. A rotor according to claim 3 or 4, characterized in that the profile 16, 23, 24) the keyway (13, 13 ') in cross-section largely fills.
6. Rotor according to one of claims 3 to 5, characterized in that the keyway (13) has a rectangular cross-section.
7. Rotor according to one of claims 3 to 5, characterized in that the keyway (13 ') has a tapering trapezoidal cross-section down.
8. A rotor according to claim 1 or 2, characterized in that the profile (22) is designed as a double-T profile.
9. A rotor according to any one of claims 1 to 8, characterized in that the profile (16, 22, .., 24) consists of an electrically insulating material.
10. A rotor according to any one of claims 1 to 8, characterized in that the profile (16, 22, .., 24) consists of a metal.
1 1. A rotor according to claim 10, characterized in that the profile (16, 22, .., 24) is made of aluminum and is extruded.
12. A rotor according to claim 10, characterized in that the profile (16, 22, .., 24) is made of copper.
13. A rotor according to any one of claims 1 to 12, characterized in that the conductor elements (14) are in the winding grooves (12) by an insulation (18) surrounding, and that the profile (22, 23, 24) outside the insulation (18).
14. A rotor according to any one of claims 1 to 12, characterized in that the conductor elements (14) are in the winding grooves (12) by an insulation (18) surrounding, and that the profile (22, 23, 24) (of the insulation 18) is enclosed with.
EP20080774242 2007-07-02 2008-06-24 Rotor for a generator Withdrawn EP2162969A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CH10572007 2007-07-02
PCT/EP2008/057990 WO2009003869A2 (en) 2007-07-02 2008-06-24 Rotor for a generator

Publications (1)

Publication Number Publication Date
EP2162969A2 true EP2162969A2 (en) 2010-03-17

Family

ID=38779784

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080774242 Withdrawn EP2162969A2 (en) 2007-07-02 2008-06-24 Rotor for a generator

Country Status (4)

Country Link
US (1) US7888837B2 (en)
EP (1) EP2162969A2 (en)
CN (1) CN101689779A (en)
WO (1) WO2009003869A2 (en)

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WO2013171130A1 (en) * 2012-05-16 2013-11-21 Alstom Technology Ltd Electric machine and method for rewinding it
US9246373B2 (en) 2012-10-31 2016-01-26 General Electric Company Cooling assembly for electrical machines and methods of assembling the same
CN104871408B (en) * 2012-12-19 2017-05-10 三菱电机株式会社 Rotating electrical machine
US9509183B2 (en) 2013-07-19 2016-11-29 General Electric Company Rotor with non-cylindrical surface for dynamoelectric machine
CN104410190B (en) * 2014-12-05 2017-11-21 东方电气集团东方电机有限公司 A kind of generator amature ventilation slot structure
CN104810948B (en) * 2015-04-28 2018-01-23 Abb技术有限公司 Rotor and the motor for including it
CN108258824A (en) * 2016-12-29 2018-07-06 东方电气集团东方电机有限公司 A kind of rotor magnetic pole direct conductor cooling cold combines cooling means with outer
CN107546884A (en) * 2017-10-19 2018-01-05 哈尔滨理工大学 A kind of rotor

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Also Published As

Publication number Publication date
CN101689779A (en) 2010-03-31
WO2009003869A2 (en) 2009-01-08
WO2009003869A3 (en) 2009-02-26
US20100181849A1 (en) 2010-07-22
US7888837B2 (en) 2011-02-15

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