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WO1991003855A1 - Machine rotative electrique rapide excitee par un aimant permanent - Google Patents

Machine rotative electrique rapide excitee par un aimant permanent

Info

Publication number
WO1991003855A1
WO1991003855A1 PCT/SE1990/000548 SE9000548W WO9103855A1 WO 1991003855 A1 WO1991003855 A1 WO 1991003855A1 SE 9000548 W SE9000548 W SE 9000548W WO 9103855 A1 WO9103855 A1 WO 9103855A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
core
segment
coils
segments
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/SE1990/000548
Other languages
English (en)
Inventor
Peter Chudi
Sture Eriksson
Anders Malmquist
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.)
ABB AB
Original Assignee
Asea Brown Boveri AB
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 Asea Brown Boveri AB filed Critical Asea Brown Boveri AB
Publication of WO1991003855A1 publication Critical patent/WO1991003855A1/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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
    • H02K9/227—Heat sinks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • 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
    • H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • H02K3/14—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots with transposed conductors, e.g. twisted conductors

Definitions

  • the present invention relates to a permanent magnet excited rotating electrical high-speed machine with a stator, comprising a stator core and a stator winding mounted thereon, and a permanent magnet excited rotor.
  • the invention also relates to a method for manufacturing such a machine.
  • electrical high-speed machine is meant in this context a machine which is designed for operation at speeds exceeding the maximally attainable speeds in an a.c. machine supplied with ordinary supply freguency voltage, that is, 3000 revolutions per minute (r.p.m) at a supply frequency of 50 Hz and 3600 r.p.m. at a supply frequency of 60 Hz.
  • the invention is mainly directed to a machine which is designed for operation at speeds which considerably exceed the above- mentioned speeds and which amount to at least about 10,000 r.p.m.
  • a typical field of use for such machines are generators directly connected to gas turbines, and in such machines the operating speed may be several tens of thousands of r.p.m. This field of use is previously known, for example from US, C, 3 181 018 and EP, A, 0 243 187.
  • the invention relates to high-speed machines adapted for motor operation as well as for generator operation.
  • stator winding it is difficult to obtain a complete symmetry of the winding, and the resultant unsymmetries of the stator winding give rise to , , , disadvantages in the form of unsymmetrical induced voltages, which involves additional losses and heating.
  • stator core is designed as a laminated core, that is, as a package of sheets, a considerable amount of wastage occurs in the prior art annular cores when punching the stator laminations, which contributes to increase the manufacturing cost of the machines.
  • the invention aims to provide an electrical machine of the kind described in the introductory part of the specification, which can be manufactured in a simpler manner and hence at a lower price than prior art machines of the kind in question, in which the stator with the stator windings can be manufactured in a simple manner with a high degree of symmetry and high precision, which has a mechanically very stable and rigid design, and in which a high utilization of the available winding space can be achieved.
  • the invention also relates to a method for manufacturing such a machine.
  • Figure la shows a section through a machine according to the invention in a plane which comprises the axis of rotation of the machine.
  • Figure la shows the section designated C-C in Figure lb.
  • Figure lb show a section through the machine shown in Figure la in a plane which is perpendicular to the axis of rotation of the machine.
  • Figure lb shows the section designated B-B in Figure la.
  • Figure 2 illustrates an alternative manufacturing process for a machine according to the invention.
  • Figures la, lb and lc show an embodiment of a machine according to the invention.
  • the symmetry and rotation axis of the machine is designated A-A.
  • the stator of the machine has a laminated ring-core built up as a package of sheets.
  • the core consists of six mutually identical and separately manufactured core segments lla-llf.
  • the stator winding of the machine is mounted on the core.
  • the stator winding consists of six coils 12a - 12f surrounding the stator core.
  • the stator winding is of three-phase design, and each phase winding consists of two series-connected diametrically opposite coils, for example 12a and 12d.
  • Each coil is arranged on one of the core segments, for example the coil 12a on the core segment 11a. Since the machine is intended for a high operating speed and hence a high operating frequency, the coils are manufactured from litz wire for reduction of the eddy current losses.
  • the coils are mounted on the core segments prior to assembly of the stator. This means that complicated special ring winding machines or manual winding are not required, but the coils may be manufactured in a conventional way.
  • the coils may be wound separately, for example in templates or on coil frames, and thereafter be fitted onto the core segments.
  • the coils may be wound directly on the core segments, and also in this case templates or coil frames may be used to give the coils the desired shapes .
  • the coils may - with high accuracy - be made mutually identical and with the desired dimensions and be given the desired location on the core segments. In this way, the configuration of the machine may made highly symmetrical. Further, a maximum utilization of the available winding space may be obtained.
  • the machine is provided with a stator housing which on the one hand provides a mechanical frame for the machine and on the other hand provides the required cooling of the stator.
  • the stator housing is built up of six cooling body segments 13a - 13f. These are made of metal, for example of a suitable light metal alloy, and are provided with cooling flanges, for example 131a and 131d, for air cooling of the machine.
  • the stator is provided with a casing tube 14, made of a non ⁇ magnetic and electrically insulating material - the latter in order to prevent eddy current losses in the tube.
  • the tube may, for example, be made of a suitable ceramic material .
  • the tube gives the stator a well-defined inner surface and, as will be described below, may be used as inner mould when embedding the stator, for example in a plastic material.
  • the rotor 2 of the machine is permanet magnet excited. It comprises one or more bodies of permanent magnet material, arranged in a suitable manner. It is provided with two shaft ends 21 and 22, which are journalled in bearings 2? and 24. The latter may consist of roller bearings, sliding bearings or, which is advantageous at high operating speeds, of gas bearings.
  • the shaft end 22 is intended for connection of the machine to a driving member, for example a gas turbine, during generator operation and to a member driven by the machine during motor operation.
  • the rotor may, for example, be formed with a high-tensile, cylindrical mantle sleeve of, for example, non-magnetic steel or composite material, the interior of which is completely filled with a permanent magnet body mechanically connected to the mantle sleeve.
  • the shaft ends of the rotor are then mechanically connected to the mantle sleeve.
  • the bearings 23 and 24 of the rotor are supported by the end walls 161 and 162 of the machine, which in turn are mounted together with the stator housing 13a - 13f. As is schematically shown in Figure la, this can be done with the aid of flanges or lugs 151, 152, 153, 154 mounted on the cooling bodies of the stator.
  • FIG. lc shows in more detail a stator segment which comprises the core segment 11a, the coil 12a and the cooling body segment 13a.
  • the latter has radially inwardly projecting portions 132 and 133, which make contact with the core segment at the ends thereof.
  • the same advantageous effect in the form of good heat transfer and fixing of the position of the stator may be obtained by providing the core segments 11a - llf with radially directed projections, for example at the boundaries between these and adjacent core segments, the cooling body segments making contact with these projections.
  • the cooling body segment is provided with a dovetailed, axially extending projection 134 and a corresponding slot 135.
  • the cooling body segments are fitted onto each other in the axial direction, and the segments are locked together by the above-mentioned projections and slots in the radial and tangential directions into a mechanically rigid and strong stator unit.
  • the fixing of one segment to another in the axial direction may be obtained, for example, by gluing the segments to each other, with the aid of mechanical fixing means, with the aid of the end pieces of the machine, or in the manner described below with reference to Figure 2.
  • the ends of the core segment 11a are provided with electrically insulating layers Ilia and 111b to prevent the stator sheets in one core segment from short-circuiting the sheets in an adjacent segment to each other, which would give rise to eddy current losses.
  • the stator segment shown in Figure lc is manufactured as follows. First, the core segment 11a is formed by putting together and possibly fixing to one another in a suitable manner a number of punched-out or cut-out sheets. Then, the coil 12a is manufactured.
  • the coil may be produced separately and be given the desired shape and dimensions by being wound in a suitable template or on a coil frame, whereupon the coil is fitted onto the core segment. Alternatively, the coil may be wound directly on the core segment and also in this case be given the desired shape and dimensions by means of a template or a coil frame. In the usual manner, if required, layers of mechanically protecting and/or electrically insulating material may be applied between the core segment and the coil.
  • the coil After applying the coil on the core segment, the coil is embedded into a suitable plastic material, for examply epoxy resin.
  • a mould is used which gives the embedded coil (with the core segment) the circular sector shape shown in Figure lc, with an arc-shaped inner surface and a outer surface adapted to the shape of the cooling body segment 13a.
  • the embedment gives the stator segment great mechanical strength and resistance to deformation and fixes the coil in an efficient manner.
  • the cooling body segment 13a is applied, which may be done by glueing or by mechanical fixing means.
  • stator 1 elements included in the stator the stator is assembled by assembling the stator elements, inserting the casing tube and applying the end pieces of the machine.
  • the insulating layers 11a and lib on the ends of the core segments may be applied in connection with the manufacture of the core segments or the stator segments or in connection with the assembly of the stator.
  • the cooling body segment is applied, possibly only provisionally, to the core segment and the coil prior to embedment. During the subsequent embedment, the cooling body segment is effectively connected to the coil and the core segment. After the embedment, the stator segments are assembled together in the manner described above.
  • the core segments with applied coils and the cooling body segments are assembled together so as to form the complete stator core and the stator housing.
  • the stator thus manufactured is embedded, thus obtaining an effective locking of the different parts of the stator to each other.
  • the casing tube 14 is used as the inner part of the mould and the stator housing formed from the cooling body segments will constitute the outer part of the mould. In this way, the casing tube is automatically fixed to the other parts of the stator.
  • the last-mentioned method of production is simple and advantageous from the point of view of production engineering, and imparts to the stator very great strength and resistance to deformation.
  • FIG. 2 shows part of a section through a stator manufactured according to- the last-mentioned method.
  • the entire space between the casing tube 14 and the cooling body segments 13a - 13f - with the exception of the coil wires and the core segments - consists of a continuous solid plastic body.
  • the cooling body segments may be provided with channels, for example 136a and 137a which are positioned such that, after the assembly of the stator, continuous channels, for example 137a - 136b, are formed between adjacent coil spaces in those parts of the cooling bodies which make contact with the core segments.
  • the plastic material penetrates into the channels and, after curing/solidification, effectively secures the cooling body segments to one another in the axial direction.
  • a machine according to the invention may, for example, have the following dimensions and data:
  • stator housing 200 outer diameter of the stator housing 200 mm outer diameter of the stator core 130 mm inner diameter of the stator core 100 mm rotor diameter 40 mm length of the machine 200 mm rated power 20 kW rated speed 100,000 r.p.m.
  • the machine and manufacturing process described above are only examples, and a plurality of other embodiments and manufacturing processes are feasible within the scope of the invention.
  • the machine described above has six core segments.
  • the number of such segments may be both greater and smaller; however, at least two. If the number of core segments is smaller than the number of coils, a plurality of coils are applied on each core segment .
  • the number of the cooling body segments in the machine described above is six, that is, the same as the number of core segments. Alternatively, the number of cooling body segments may differ from the number of core segments.
  • the stator housing is manufactured in one single piece. This embodiment is especially advantageous when using the production method described above in which the embedment is performed only after the assembly of the stator. The stator housing is then used as outer part of the mould.
  • the cooling body segments or the stator housing may be omitted.
  • stator core described above is completely without teeth.
  • the invention may also be applied to toothed stator cores.
  • the plastic material used in the above-described manufacturing processes for embedding the core segments and the coils may be provided with suitable fillers, known per se, for improving its thermal conductivity and/or its mechanical or dielectric strength.
  • suitable fillers known per se, for improving its thermal conductivity and/or its mechanical or dielectric strength.
  • the embedment of coils and core segments described above may possibly be omitted, for example when the demands for strength and stability are lower.
  • the casing tube described above may either, as described above, be left in place after the embedment, or be removed. In the latter case, of course, its electrical and magnetic properties need not be taken into consideration.
  • the invention provides, on the one hand, important advantages from the point of view of production engineering in the form of simple and hence economically advantageous manufacture and, on the other hand, a machine with a well utilized winding space, a high degree of symmetry, accurate dimensions and very high mechanical strength and hence good electrical and mechanical properties .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

Une machine rotative électrique rapide excitée par un aimant permanent comporte un noyau de stator (11a à 11f), ainsi qu'un rotor (2) excité par un aimant permanent. L'enroulement du stator, composé de six bobines (12a à 12f) est conçu comme un enroulement torique et agencé sur le noyau du stator. Ledit stator se présente sous la forme d'une pluralité de segments (par exemple 11a, 12a, 13a) de stator assemblés. Chaque segment de stator comprend un segment de noyau (par exemple 11a) doté d'une bobine (12a) appliquée sur le segment du noyau avant l'assemblage dudit stator.
PCT/SE1990/000548 1989-08-28 1990-08-27 Machine rotative electrique rapide excitee par un aimant permanent Ceased WO1991003855A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8902855A SE466878B (sv) 1989-08-28 1989-08-28 Permanentmagnetiserad roterande elektrisk hoeghastighetsmaskin
SE8902855-9 1989-08-28

Publications (1)

Publication Number Publication Date
WO1991003855A1 true WO1991003855A1 (fr) 1991-03-21

Family

ID=20376758

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000548 Ceased WO1991003855A1 (fr) 1989-08-28 1990-08-27 Machine rotative electrique rapide excitee par un aimant permanent

Country Status (3)

Country Link
AU (1) AU6356590A (fr)
SE (1) SE466878B (fr)
WO (1) WO1991003855A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5875540A (en) * 1997-01-21 1999-03-02 Siemens Westinghouse Power Corporation Modular design and manufacture of a stator core
WO2002011268A1 (fr) * 2000-08-02 2002-02-07 Von Roll Isola Winding Systems Gmbh Enroulements de machines electriques comprenant des conducteurs constitues de fils toronnes
EP1115190A4 (fr) * 1999-07-15 2005-09-14 Moric Kk Machine lectrique rotative
EP2262080A4 (fr) * 2008-04-03 2012-11-28 Yu Tian Moteur à courant continu sans balai et son radiateur

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1049967B (fr) * 1953-11-23
US483700A (en) * 1892-10-04 Armature for dynamos and motors
DE498612C (de) * 1928-06-22 1930-05-24 Aeg Einrichtung zum Schutz der Staenderendpakete, insbesondere von grossen Wechselstrom-maschinen gegen Beschaedigung durch die vorwiegend vom Stirnstreufeld erzeugten EMKe
GB643289A (en) * 1946-08-20 1950-09-15 Cornelis Roeterdink Electric machine having radially accessible grooves for the winding
US3638055A (en) * 1969-07-04 1972-01-25 Sulzer Ag Electrical apparatus
US3932929A (en) * 1973-09-28 1976-01-20 Skf Industrial Trading And Development Company, B.V. Method of making a sectioned stator for a dynamoelectric machine
EP0048213A1 (fr) * 1980-09-11 1982-03-24 Schweizerische Aluminium Ag Boîtier de moteur en forme d'enveloppe cylindrique
US4547713A (en) * 1982-11-05 1985-10-15 Kollmorgen Technologies Corporation Toroidally wound brushless DC motor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US483700A (en) * 1892-10-04 Armature for dynamos and motors
DE498612C (de) * 1928-06-22 1930-05-24 Aeg Einrichtung zum Schutz der Staenderendpakete, insbesondere von grossen Wechselstrom-maschinen gegen Beschaedigung durch die vorwiegend vom Stirnstreufeld erzeugten EMKe
GB643289A (en) * 1946-08-20 1950-09-15 Cornelis Roeterdink Electric machine having radially accessible grooves for the winding
DE1049967B (fr) * 1953-11-23
US3638055A (en) * 1969-07-04 1972-01-25 Sulzer Ag Electrical apparatus
US3932929A (en) * 1973-09-28 1976-01-20 Skf Industrial Trading And Development Company, B.V. Method of making a sectioned stator for a dynamoelectric machine
EP0048213A1 (fr) * 1980-09-11 1982-03-24 Schweizerische Aluminium Ag Boîtier de moteur en forme d'enveloppe cylindrique
US4547713A (en) * 1982-11-05 1985-10-15 Kollmorgen Technologies Corporation Toroidally wound brushless DC motor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 8, No. 256, E280; & JP,A,59 129 547, 25-07-84, MATSUSHITA DENKI SANGYO K.K. *
PATENT ABSTRACTS OF JAPAN, Vol. 8, No. 36, E227; & JP,A,58 195 454, 14-11-1983, MATSUSHITA DENKI SANGYO K.K. *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5875540A (en) * 1997-01-21 1999-03-02 Siemens Westinghouse Power Corporation Modular design and manufacture of a stator core
EP1115190A4 (fr) * 1999-07-15 2005-09-14 Moric Kk Machine lectrique rotative
WO2002011268A1 (fr) * 2000-08-02 2002-02-07 Von Roll Isola Winding Systems Gmbh Enroulements de machines electriques comprenant des conducteurs constitues de fils toronnes
EP2262080A4 (fr) * 2008-04-03 2012-11-28 Yu Tian Moteur à courant continu sans balai et son radiateur

Also Published As

Publication number Publication date
SE8902855L (sv) 1991-03-01
AU6356590A (en) 1991-04-08
SE8902855D0 (sv) 1989-08-28
SE466878B (sv) 1992-04-13

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