EP4154387A1 - Rotor für eine elektrische maschine - Google Patents
Rotor für eine elektrische maschineInfo
- Publication number
- EP4154387A1 EP4154387A1 EP21726595.8A EP21726595A EP4154387A1 EP 4154387 A1 EP4154387 A1 EP 4154387A1 EP 21726595 A EP21726595 A EP 21726595A EP 4154387 A1 EP4154387 A1 EP 4154387A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- hydraulic
- fastening element
- rotor according
- hydraulic fastening
- 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- Withdrawn
Links
Classifications
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/15—Sectional machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/09—Machines characterised by the presence of elements which are subject to variation, e.g. adjustable bearings, reconfigurable windings, variable pitch ventilators
Definitions
- the invention relates to a rotor for an electrical machine, in particular for a large electrical machine as used in water power plants.
- the rotor includes a rotor hub and poles. At least part of a pole (e.g. the pole piece) is connected to the rest of the rotor by means of an arrangement of (usually axially extending) projections and grooves. Often the poles as a whole are also connected to the rotor hub by means of such arrangements.
- Such an arrangement of projections and grooves is also referred to as a claw construction, since the projections engage in the associated grooves in a claw-like manner.
- claw constructions as such enable an (axial) displacement of the two interconnected parts, which is used for the assembly and disassembly of these parts, they must be secured against such displacement during operation of the electrical machine by means of suitable fastening means.
- wedges are used for this.
- the introduction of the wedges results in a pretensioning of the claw connection, so that an axial displacement due to frictional engagement is prevented.
- the preload also serves to avoid play in the claw connection, since such play can lead to severe damage in the area of the claw connection, especially when the electrical machine is started and stopped frequently.
- Fastening by means of wedges is disclosed, for example, in documents CH 122159, US 2 308 028, EP 0 866 540 A2, US 3 740 600 and GB 2 022 324 A, the latter document disclosing the use of tubular resilient fastening means.
- the prestress applied with the known fastening means cannot be dosed in a satisfactory manner, since the forces introduced thereby are limited and cannot really be controlled.
- the inventor has set himself the task of specifying fastening means that allow a precisely defined pretension.
- Fig.1 Flydraulic fastening elements in cross section; 2 hydraulic fastening element in longitudinal section - detail;
- FIG. 3 shows an arrangement according to the invention in a first embodiment
- 5 shows the arrangement according to the invention in a section through the rotor axis; 6 shows the arrangement according to the invention in a further embodiment in a lateral view;
- FIG. 7 shows the arrangement according to FIG. 6 in cross section
- FIG. 1 shows a schematic representation of hydraulic fastening elements in cross section, as they are used in the present invention.
- a hydraulic fastening element which is denoted by 1
- each comprises a shell, which is denoted by 2.
- the shell 2 encloses a space which is filled with hydraulic fluid.
- the hydraulic fluid is denoted by 3.
- the embodiment shown on the left has a circular cross section, and the embodiment shown on the right has a square cross section.
- Such fastening elements can, however, also have any other cross-section, for example a rectangular cross-section (cf. FIG. 3).
- Figure 2 shows a hydraulic fastening element 1 in longitudinal section.
- FIG. 2 shows the end of the hydraulic fastening element 1, which has the device for fastening and releasing the hydraulic fastening element 1.
- the opposite end could also have such a device, so that the fastening element 1 can be fastened or released from both ends.
- a device which is denoted by 4 and is designed so that it can pressurize the hydraulic fluid 3 enclosed in the casing 2. It is clear that both the shell 2 and the piston 4 must be designed to be correspondingly tight. The sealing of the piston indicated in FIG. 2 can of course also be designed differently.
- the fastening element 1 further comprises a device for actuating the piston 4, which is designated by 5.
- a simple and expedient embodiment for this device 5 for actuating the piston 4 consists of a screw and a thread which are designed so that the screw presses the piston 4 into the space filled with hydraulic fluid when it is screwed in.
- the tightening torque of the screw serves as a measure for the pressure of the hydraulic fluid.
- Means can also be provided which protect the screw from unintentional loosening (screw locking).
- the device 5 for fastening and releasing the hydraulic fastening element 1 could also comprise a valve and a connection for connecting a pressure source.
- the fastening element 1 is fastened in that the hydraulic fluid 3 located inside is placed under a sufficiently high overpressure. The release takes place by reducing the overpressure.
- FIG. 3 shows an arrangement according to the invention in a first embodiment.
- FIG. 3 shows the connection between a rotor hub, which is labeled 6, and a pole, which is labeled 7.
- the element labeled 6 could also be a pole body, and the element labeled 7 designated element could also be a pole piece, which is otherwise connected to the rotor hub.
- the claw connection is designed as a dovetail connection.
- the projection is connected to the element 7 and the associated groove is located in the element 6.
- the connection shown is fastened and pretensioned with a hydraulic fastening element, which is denoted by 1 and is arranged in the groove base.
- the hydraulic fastening element 1 shown has a rectangular cross section. The cross section could also be designed differently. Appropriate means (for example a groove or projections), which are not shown in FIG. 3, could advantageously be provided for the lateral guidance of the fastening element 1.
- the dovetail connection shown in FIG. 3 comprises a projection and an associated groove.
- a plurality of projections and a corresponding number of grooves could also be provided.
- the projections and grooves are arranged in the axial direction, ie FIG. 3 shows a section perpendicular to the rotor axis.
- the axial arrangement of the grooves and projections has the advantage that a pole or a pole piece can be expanded in the axial direction.
- FIG. 4 shows an arrangement according to the invention in a further embodiment.
- the claw connection is designed as a double flame head connection. In the case of a flame head connection, the two mating surfaces that are created by the preload and by the Centrifugal force are pressed against each other during operation of the electrical machine, arranged in one plane.
- the arrangement shown in FIG. 4 comprises a total of eight fastening elements, one of which is denoted by 1.
- Half of the fastening elements 1 are arranged in the bottom of the groove and the other half are each flanking the hammer head projections.
- the closed dashed lines indicate the force flows introduced by the fastening elements.
- the fastening elements 1 have a circular cross-section and are guided in corresponding grooves. In this, too, as in all embodiments, the fastening elements 1 could have a different cross section.
- FIGS. 3 and 4 show only by way of example two of very many different possible embodiments that result from any combination of claw shapes, number of claws, orientation of the claws, number, arrangement and cross-sectional shape of the hydraulic fastening elements and the optional use of spacer elements. Further possible combinations result from the various embodiments of the hydraulic fastening means with regard to the designs which are explained in FIGS. 2 and 5 to 7 and the associated text passages.
- FIG. 5 shows an arrangement according to the invention in a section through the rotor axis, which is denoted by 9.
- Figure 5 is used to different To illustrate possibilities of the arrangement of fastening elements 1.
- On the right side of FIG. 5 there is a single fastening element between the rotor hub or the pole body 6 and the pole or pole shoe 7.
- On the left side of FIG. 5 there are two fastening elements between the rotor hub or the pole body 6 and the pole or pole shoe 7.
- the longitudinal axis of the fastening elements 1 is aligned parallel to the rotor axis 9. In each case one end of the fastening elements 1 protrudes beyond the rotor in the axial direction.
- the device for fastening and releasing the respective hydraulic fastening element 1 is arranged at this end, ie for example the arrangement according to FIG. 2 or a valve and a connection for a pressure source.
- the arrangement according to the right-hand side of FIG. 5 is advantageous when the rotor of the electrical machine is only accessible from one axial side.
- the arrangement according to the left-hand side of FIG. 5, on the other hand, can be used when the rotor is accessible from both axial sides. In this way, shorter fastening elements 1 can be used.
- the connections according to the invention are generally implemented as follows: The pole or pole shoe is installed (usually in the axial direction) by pushing the projections into the associated grooves. Then the fasteners are attached to the intended locations. Then the fasteners are activated. This happens either in that the pistons are pressed in according to FIG. 2, or in that the hydraulic fluid in the fastening elements is pressurized by a pressure source. Due to the overpressure of the hydraulic fluid inside the casing, the casing walls of the fastening elements are pressed outwards, whereby the connection is pretensioned. Due to the homogeneously distributing pressure inside the fastening elements, the forces which prestress the connection are also distributed very homogeneously, so that the arrangement according to the invention enables a significant improvement in terms of the prestressing of such a connection.
- FIG. 6 shows a modification of the arrangement from FIG. 4. Only the fastening elements from FIG. 4 are shown schematically in a lateral view. the dashed lines indicate the upper or lower end of the rotor.
- the fastening elements 1 are alternately connected to one another above and below the rotor in such a way that a continuous strand results.
- the connection is made with pressure lines, ie for example pressure hoses or pressure pipes. These pressure lines are designed in such a way that they can withstand the expected internal pressure without any significant expansion.
- the strand shown in FIG. 6 thus represents, as it were, the shell of a single fastening element, which in turn is filled with hydraulic fluid.
- the axially extending sections each act like a single fastening element as described above.
- the device for generating the overpressure can be attached anywhere in the line.
- the fastening elements in the string have a common means for fastening and loosening.
- the device shown in FIG. 2 could be arranged at one of the ends of the strand. The other end would then simply be the closed end of the envelope. This end can of course simply terminate axially there with the rotor, so that the arcuate stub shown in FIG. 6 can be omitted there.
- both ends of the string include valves. Then the string can be empty during assembly. The filling with hydraulic fluid takes place only after all elements including the connections have been installed.
- FIG. 7 shows the arrangement of FIG. 6 in a section perpendicular to the rotor axis.
- the connecting lines between the axially extending sections of the fastening elements are shown alternately with solid and dashed lines in order to indicate the corresponding position of the same above or below the rotor.
- the connecting lines are arranged in such a way that, in this perspective, they are located completely in the area of the pole or pole shoe designated in FIG. 4 with 7. This ensures that the pole or pole shoe can be easily removed in the axial direction.
- All could Connecting lines can also be arranged completely in the area of the rotor hub or of the pole body 6. Axial expansion is then also possible without any problems.
- FIG. 7 shows a pressure sensor which is located on the string of the hydraulic fastening elements and is denoted by 10.
- the internal pressure of the entire string and thus the holding function of the hydraulic fastening elements contained in the string can be monitored.
- the measured values recorded by the pressure sensor 10 can be transmitted to the control system of the electrical installation either wirelessly, for example via Bluetooth, or by means of slip rings.
- more fastening elements than those shown in FIGS. 6 and 7 can also be integrated in one strand, for example all hydraulic fastening elements built into the rotor. To remove a pole or pole piece, one or two of the connecting lines between the fastening elements must then of course be removed.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020113625.0A DE102020113625A1 (de) | 2020-05-20 | 2020-05-20 | Rotor für eine elektrische Maschine |
PCT/EP2021/062391 WO2021233724A1 (de) | 2020-05-20 | 2021-05-11 | Rotor für eine elektrische maschine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4154387A1 true EP4154387A1 (de) | 2023-03-29 |
Family
ID=76011917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21726595.8A Withdrawn EP4154387A1 (de) | 2020-05-20 | 2021-05-11 | Rotor für eine elektrische maschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4154387A1 (de) |
DE (1) | DE102020113625A1 (de) |
WO (1) | WO2021233724A1 (de) |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH122159A (de) | 1926-11-09 | 1927-08-16 | Oerlikon Maschf | Befestigungseinrichtung für Magnetpole an Rotoren elektrischer Maschinen. |
US2308028A (en) | 1942-01-28 | 1943-01-12 | Westinghouse Electric & Mfg Co | Salient-pole tightening means |
GB846464A (en) | 1956-01-27 | 1960-08-31 | English Electric Co Ltd | Improvements relating to dynamo electric machines |
CH345064A (de) | 1956-12-03 | 1960-03-15 | Oerlikon Maschf | Anordnung zur Befestigung von Polschuhen an Polkernen elektrischer Maschinen |
AT255544B (de) | 1965-12-03 | 1967-07-10 | Elin Union Ag Fuer Elek Schen | Federnde, kraftschlüssige Verbindung zwischen Nabenstern und Rotorkranz von elektrischen Maschinen großer Leistung |
CH431687A (de) * | 1966-02-21 | 1967-03-15 | Bbc Brown Boveri & Cie | Lösbare Verbindung für einen Polradkranz auf dem Radstern einer grossen vertikalachsigen elektrischen Maschine |
US3740600A (en) | 1971-12-12 | 1973-06-19 | Gen Electric | Self-supporting coil brace |
SE397995B (sv) * | 1975-11-26 | 1977-11-28 | Asea Ab | Forfarande for fastsettning av en laminerad statorpol i en statorring hos en roterande elektrisk maskin |
US4179634A (en) | 1978-06-02 | 1979-12-18 | R. E. Phelon-Company, Inc. | Magneto rotor construction |
US5952755A (en) | 1997-03-18 | 1999-09-14 | Electric Boat Corporation | Permanent magnet motor rotor |
JP5279989B2 (ja) | 2006-03-07 | 2013-09-04 | 本田技研工業株式会社 | 電動機 |
US8072108B2 (en) | 2009-10-30 | 2011-12-06 | Finkle Louis J | Electric motor or generator with mechanically tuneable permanent magnetic field |
US9850882B2 (en) | 2011-05-19 | 2017-12-26 | Vestas Wind Systems A/S | Wind turbine generator with localized air gap control and a wind turbine having such a generator |
EP3026792A1 (de) * | 2014-11-14 | 2016-06-01 | ALSTOM Renewable Technologies | Anordnung zur kompensierung einer thermischen ausdehnung in einer elektrischen maschine |
US10224776B2 (en) | 2015-06-03 | 2019-03-05 | General Electric Company | Retention assembly for stator bar using shim with stator wedge and related method |
JP2019140832A (ja) | 2018-02-13 | 2019-08-22 | 本田技研工業株式会社 | 可変界磁回転電機 |
BR112021003810A2 (pt) * | 2018-08-31 | 2021-05-18 | Weg Equipamentos Elétricos S/A | rotor de polos híbridos para máquina elétrica girante de polos salientes e máquina elétrica utilizando os mesmos |
-
2020
- 2020-05-20 DE DE102020113625.0A patent/DE102020113625A1/de active Pending
-
2021
- 2021-05-11 WO PCT/EP2021/062391 patent/WO2021233724A1/de unknown
- 2021-05-11 EP EP21726595.8A patent/EP4154387A1/de not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2021233724A1 (de) | 2021-11-25 |
DE102020113625A1 (de) | 2021-11-25 |
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