AU736226B2 - Rotating electric machine with magnetic circuit - Google Patents
Rotating electric machine with magnetic circuit Download PDFInfo
- Publication number
- AU736226B2 AU736226B2 AU93706/98A AU9370698A AU736226B2 AU 736226 B2 AU736226 B2 AU 736226B2 AU 93706/98 A AU93706/98 A AU 93706/98A AU 9370698 A AU9370698 A AU 9370698A AU 736226 B2 AU736226 B2 AU 736226B2
- Authority
- AU
- Australia
- Prior art keywords
- stator
- rotor
- machine
- cable
- characteri
- 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
Links
- 238000004804 winding Methods 0.000 claims description 15
- 239000004020 conductor Substances 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 description 11
- 230000001360 synchronised effect Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 229920006245 ethylene-butyl acrylate Polymers 0.000 description 2
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- QYMGIIIPAFAFRX-UHFFFAOYSA-N butyl prop-2-enoate;ethene Chemical compound C=C.CCCCOC(=O)C=C QYMGIIIPAFAFRX-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000011243 crosslinked material Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000005042 ethylene-ethyl acrylate Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000306 polymethylpentene Polymers 0.000 description 1
- 239000011116 polymethylpentene Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/22—Synchronous generators having windings each turn of which co-operates alternately with poles of opposite polarity, e.g. heteropolar generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/30—Windings characterised by the insulating material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
-
- 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
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
- H02K2203/15—Machines characterised by cable windings, e.g. high-voltage cables, ribbon cables
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Description
WO 99/17424 PCT/SE98/01735 1 ROTATING ELECTRIC MACHINE WITH MAGNETIC CIRCUIT The rotating electric machines referred to herein comprise synchronous machines used primarily as generators for connection to distribution and transmission networks, in the following referred to as power networks. The synchronous machines are also used as motors as well as for phase compensation and voltage control and in that case as mechanically open-circuited machines. The technical field also includes dual-fed machines, asynchronous static current converter cascades, outerpole machines and synchronous flow machines. These machines are intended for use with high voltages. High voltages shall be understood here to mean electric voltages in excess of 10 kV. A typical operating range for the machine according to the invention may be 36 to 800 kV.
The use of high-voltage insulated electric conductors in the stator winding, the conductors in the following being termed cables, with solid insulation similar to that used in cables for transmitting electric power (e.g.
PEX cables), enables the voltage of the machine to be increased to such levels that it can be connected directly to the power network without an intermediate transformer. 'The need for fast, continuously adjustable reactive power is thus satisfied, connected directly to subtransmission or transmission level in order to deal with system stability andlor the dependence of rotating mass and e.m.f. in the vicinity of high-voltage direct current transmissions or, alternatively, to generate or consume high-voltage alternating current connected directly to subtransmission or transmission level. The station may be for a few MVA up to thousands of MVA.
The obvious advantage is that transformers in which the reactance consumes reactive power are unnecessary, as are also traditional highpower circuit breakers. Advantages are also gained with regard to network quality since rotating compensation is obtained, and with regard to overload capacity which may be +100% in such machines. The control range may be +100% for reactive power.
However, problems may arise since the stator winding in such a high-voltage machine, with cable of the type described, acquires considerable radial dimension. At a given diameter of the machine's air gap, the diameter increases in proportion to the number of tumrns of the winding and WO 99/17424 PCT/SE98/01735 2 the slots in the stator laminations carrying the cable must be deep and the stator laminations numerous.
The object of the present invention is to solve the abovementioned problems and provide a machine with a smaller stator and thus an arrangement which is smaller in dimension but not in power. This object is achieved by the machine according to the invention being given the characteristics defined in the claims.
The invention will be described in more detail with reference to the accompanying drawings, in which Figure 1 shows a cross section through a cable used in the invention, Figure 2 shows an axial section through a machine according to the invention, designed as a hydroelectric generator, Figure 3 likewise shows an axial section through a second embodiment of the machine according to the invention, Figure 4 likewise shows an axial section through a third embodiment of the invention according to the invention, and Figure 5 likewise shows an axial section through a fourth embodiment of the invention according to the invention.
The invention is in the first place intended for use with a highvoltage cable 1 of the type (Fig. 1) built up of a core having a plurality of strand parts 2, an insulating layer 4 surrounding the inner semiconducting layer, and an outer semiconducting layer 5, and its advantages are particularly pronounced here. The invention refers particularly to such a cable having a diameter within the interval 20-200 mm and a conducting area within the interval 80-3000 mm 2 The cable therefore does not include the outer sheath that normally surrounds a cable for power distribution.
The insulated conductor or high-voltage cable used in the present invention is flexible and is of the type described in more detail in WO 97145919 and WO 97/45847. The insulated conductor or cable is described further in WO 97/45918, WO 97/45930 and WO 97145931.
Accordingly, the windings, in the arrangement according to the invention, are preferably of a type corresponding to cables having solid, extruded insulation, of a type now used for power distribution, such as XLPE-cables or cables with EPR-insulation. Such a cable comprises an inner conductor composed of one or more strand parts, an inner semicon- 1 :1 WO 99/17424 PCT/SE98/01735 3 ducting layer surrounding the conductor, a solid insulating layer surrounding this and an outer semiconducting layer surrounding the insulating layer. Such cables are flexible, which is an important property in this context since the technology for the arrangement according to the invention is based primarily on winding systems in which the winding is formed from cable which is bent during assembly. The flexibility of an XLPE-cable normally corresponds to a radius of curvature of approximately 20 cm for a cable with a diameter of 30 mm, and a radius of curvature of approximately 65 cm for a cable with a diameter of 80 mm. In the present application the term "flexible" is used to indicate that the winding is flexible down to a radius of curvature in the order of four times the cable diameter, preferably eight to twelve times the cable diameter.
The winding should be constructed to retain its properties even when it is bent and when it is subjected to thermal or mechanical stress during operation. It is vital that the layers retain their adhesion to each other in this context. The material properties of the layers are decisive here, particularly their elasticity and relative coefficients of thermal expansion. In an XLPE-cable, for instance, the insulating layer consists of crosslinked, low-density polyethylene, and the semiconducting layers consist of polyethylene with soot and metal particles mixed in. Changes in volume as a result of temperature fluctuations are completely absorbed as changes in radius in the cable and, thanks to the comparatively slight difference between the coefficients of thermal expansion in the layers in relation to the elasticity of these materials, the radial expansion can take place without the adhesion between the layers being lost.
The material combinations stated above should be considered only as examples. Other combinations fulfilling the conditions specified and also the condition ofbeing semiconducting, ie. having resistivity within the range of 10-1-106 ohm-cm, e.g. 1-500 ohm-cm, or 10-200 ohm-cm, naturally also fall within the scope of the invention.
The insulating layer may consist, for example, of a solid thermoplastic material such as low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene polybutylene polymethyl pentene cross-linked materials such as cross-linked polyethylene WO 99/17424 PCT/SE98/01735 4 (XLPE), or rubber such as ethylene propylene rubber (EPR) or silicon rubber.
The inner and outer semiconducting layers may be of the same basic material but with particles of conducting material such as soot or metal powder mixed in.
The mechanical properties of these materials, particularly their coefficients of thermal expansion, are affected relatively little by whether soot or metal powder is mixea in or not at least in the proportions required to achieve the conductivity necessary according to the invention.
The insulating layer and the semiconducting layers thus have substantially the same coefficients of thermal expansion.
Ethylene-vinyl-acetate copolymers/nitrile rubber (EVA/NBR), butyl graft polyethylene, ethylene-butyl-acrylate copolymers (EBA) and ethylene-ethyl-acrylate copolymers (EEA) may also constitute suitable polymers for the semiconducting layers.
Even when different types of material are used as base in the various layers, it is desirable for their coefficients of thermal expansion to be substantially the same. This is the case with the combination of the materials listed above.
The materials listed above have relatively good elasticity, with an E-modulus of E<500 MPa, preferably <200 MPa. The elasticity is sufficient for any minor differences between the coefficients of thermal expansion for the materials in the layers to be absorbed in the radial direction of the elasticity so that no cracks apkear, or any other damage, and so that the layers are not released from each other. The material in the layers is elastic, and the adhesion between the layers is at least of the same magnitude as in the weakest of the materials.
The conductivity of the two semiconducting layers is sufficient to substantially equalize the potential along each layer. The conductivity of the outer semiconducting layer is sufficiently high to enclose the electrical field within the cable, but sufficiently low not to give rise to significant losses due to currents induced in the longitudinal direction of the layer.
Thus, each of the two semiconducting layers essentially constitutes one equipotential surface, and these layers will substantially enclose the electrical field between them.
WO 99/17424 PCT/SE98/01735 There is, of course, nothing to prevent one or more additional semiconducting layers being arranged in the insulating layer.
In Figure 1, illustrating the insulated conductor -or cable, the three layers are executed so that they adhere to each other even when the cable is bent. The cable shown is flexible and this property is retained throughout the life of the cable.
Figure 2 shows in axial section a first embodiment of a rotating high-voltage machine according to the invention, in this case in the form of a hydroelectric generator. The rotor spokes 8 are attached on the turbine shaft 6 which, in this case, is journalled in a single guide bearing 7. These spokes support the rotor 9 with its excitation winding 10. The stator 11 is supported from below on a fixed foundation 12, and coil ends 14 of the stator winding 13 protrude from the stator 11.
In comparison with high-voltage machines proposed earlier, thus, the stator and rotor have exchanged places on each side of the air gap This means that the slot depth 16 for the stator winding 13 will be smaller, and also the number of stator laminations will be fewer for a given air gap diameter 17.
18 denotes brakes for the rotor 9, arranged on the fixed foundation 12 for friction engagement with the rotor. The arrows in Figure 2 indicate the flow of cooling air through the stator 11.
The poles 21 on the rotor are pronounced and since they are placed on the inside of the rotor 9, against the stator 11, the rotor ring can be run at high speed without risk of problems with regard to its strength as may otherwise be the case in the higher speed register.
Figures 3-5 show three other embodiments of the machine according to the invention, designed as a hydroelectric generator. These figures reveal various ways of utilizing the generator pit 22 with varying degrees of success. Figure 3 shows the stator 11 suspended from the fixed beam 19, while the rotor 9 is supported by spokes 8 arranged below the stator.
In this case, however, two guide bearings 7 and 20 are required for the shaft 6.
Figure 4 shows a embodiment of the machine in which, as in Figure 3, the rotor spokes 8 are arranged below the stator 11. The generator pit 22 is utilized better and the total height is less since the spokes 8 are WO 99/17424 PCr/SE98/01735 6 inclined slightly upwards. However, two guide bearings 7 and 20 are still required.
Figure 5 shows an even more compressed embodiment with the spokes 8 still further inclined. The machine has thus been compressed to such an extent that one guide bearing 7 is sufficient.
The rotor 9 and stator 11 may be so dimensioned that at nominal voltage, nominal power factor and over-excited operation, the thermally based stator and rotor current limits are exceeded approximately simultaneously. However, they may also be dimensioned so that at nominal voltage, nominal power factor and over-excited operation, the thermally based stator limit is exceeded before the thermally based rotor current limit is exceeded. At nominal voltage, nominal power factor and over-excited operation, the machine preferably has 100% overload capacity for two hours.
The synchronous reactance in transverse direction is suitably considerably less than the synchronous reactance in direct direction. The machine is suitably equipped with excitation systems enabling negative and positive excitation.
The stator-winding phases in the machine are preferably Yconnected. The Y-point of the stator winding can then be insulated and protected from over-voltages by surge diverters. However, the Y-point of the stator winding may be earthed with the aid of a third-harmonic filter, i.e. a suppression filter between Y-point and earth. The suppression filter may be so designed that it greatly reduces or even eliminates thirdharmonic currents through th' machine, while at the same time being dimensioned so that voltages and currents are limited in the event of faults in the system. The third-harmonic filter may be protected against overvoltages by surge diverters connected in parallel with the third-harmonic filter.
Claims (7)
1. A rotating electric machine having a magnetic circuit for high voltage, characteri z ed by a stator the winding of which includes a high- voltage cable, and a rotor surrounding the stator, the cable including a flexible conductor surrounded by solid insulation having an inner layer with semicon- ducting properties, an insulating part and an outer layer with semiconducting properties.
2. A device as claimed in claim 1, characterized in that the layers are arranged to adhere to each other even when the cable is bent.
3. A machine as claimed in claim 1 or claim 2, characterize d in that the rotor is rigidly connected to the machine shaft for out-going or in- 15 going kinetic energy via spokes extending past the stator.
4. A machine as claimed in claim 3, characteri z ed in that the stator is supported from below on a fixed foundation and in that the rotor is supported from above by spokes extending over the stator from the ma- chine shaft. o
5. A machine as claimed in claim 3, characteri z e d in that the stator is supported from above by fixed radial beams and in that the rotor is supported from below by spokes extending below the stator from the ma- chine shaft.
6. A machine as claimed in claim 4 or claim 5, characteri z ed in St h a t the brakes for the rotor are arranged on the fixed foundation for friction engagement with the rotor.
7. A machine as claimed in any of claims 1-6, c h a racte ri z ed in t h a t the rotor has pronounced poles.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9703549 | 1997-09-30 | ||
| SE9703549A SE513385C2 (en) | 1997-09-30 | 1997-09-30 | Rotary electric machine where the stator winding is a high voltage cable |
| PCT/SE1998/001735 WO1999017424A1 (en) | 1997-09-30 | 1998-09-29 | Rotating electric machine with magnetic circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU9370698A AU9370698A (en) | 1999-04-23 |
| AU736226B2 true AU736226B2 (en) | 2001-07-26 |
Family
ID=20408445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU93706/98A Ceased AU736226B2 (en) | 1997-09-30 | 1998-09-29 | Rotating electric machine with magnetic circuit |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP1020002A1 (en) |
| JP (1) | JP2001518774A (en) |
| CN (1) | CN1272238A (en) |
| AR (1) | AR017274A1 (en) |
| AU (1) | AU736226B2 (en) |
| CA (1) | CA2305417A1 (en) |
| NO (1) | NO20001317D0 (en) |
| PL (1) | PL339557A1 (en) |
| SE (1) | SE513385C2 (en) |
| WO (1) | WO1999017424A1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6891303B2 (en) | 1996-05-29 | 2005-05-10 | Abb Ab | High voltage AC machine winding with grounded neutral circuit |
| AU3052997A (en) | 1996-05-29 | 1998-01-05 | Asea Brown Boveri Ab | Rotating electrical machine comprising high-voltage stator winding and elongated support devices supporting the winding and method for manufacturing such machine |
| SE9602079D0 (en) | 1996-05-29 | 1996-05-29 | Asea Brown Boveri | Rotating electric machines with magnetic circuit for high voltage and a method for manufacturing the same |
| NZ333017A (en) | 1996-05-29 | 2000-09-29 | Asea Brown Boveri | Cable for use in transformer or dynamoelectric machine, insulation layer between two semiconducting layers |
| SE9704412D0 (en) | 1997-02-03 | 1997-11-28 | Asea Brown Boveri | A power transformer / reactor |
| SE9704413D0 (en) | 1997-02-03 | 1997-11-28 | Asea Brown Boveri | A power transformer / reactor |
| SE510452C2 (en) | 1997-02-03 | 1999-05-25 | Asea Brown Boveri | Transformer with voltage regulator |
| SE513083C2 (en) | 1997-09-30 | 2000-07-03 | Abb Ab | Synchronous compensator system and the use of such and phase compensation method in a high voltage field |
| SE513555C2 (en) | 1997-11-27 | 2000-10-02 | Abb Ab | Method of applying a pipe means in a space of a rotating electric machine and rotating electric machine according to the method |
| GB2331858A (en) | 1997-11-28 | 1999-06-02 | Asea Brown Boveri | A wind power plant |
| GB2331853A (en) | 1997-11-28 | 1999-06-02 | Asea Brown Boveri | Transformer |
| SE516002C2 (en) | 2000-03-01 | 2001-11-05 | Abb Ab | Rotary electric machine and method of making a stator winding |
| US6885273B2 (en) | 2000-03-30 | 2005-04-26 | Abb Ab | Induction devices with distributed air gaps |
| SE516442C2 (en) | 2000-04-28 | 2002-01-15 | Abb Ab | Stationary induction machine and cable therefore |
| JP2020191731A (en) * | 2019-05-22 | 2020-11-26 | 日新電機株式会社 | Harmonic filter device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4677328A (en) * | 1984-11-08 | 1987-06-30 | Rikichi Kumakura | Generator for use on bicycle |
| US4785138A (en) * | 1985-12-06 | 1988-11-15 | Kabel Electro Gesellschaft mit beschrankter Haftung | Electric cable for use as phase winding for linear motors |
| US5036165A (en) * | 1984-08-23 | 1991-07-30 | General Electric Co. | Semi-conducting layer for insulated electrical conductors |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4258280A (en) * | 1975-11-07 | 1981-03-24 | Bbc Brown Boveri & Company Limited | Supporting structure for slow speed large diameter electrical machines |
| US4475075A (en) * | 1981-10-14 | 1984-10-02 | Munn Robert B | Electric power generator and system |
-
1997
- 1997-09-30 SE SE9703549A patent/SE513385C2/en not_active IP Right Cessation
-
1998
- 1998-09-29 JP JP2000514376A patent/JP2001518774A/en active Pending
- 1998-09-29 CA CA002305417A patent/CA2305417A1/en not_active Abandoned
- 1998-09-29 CN CN 98809645 patent/CN1272238A/en active Pending
- 1998-09-29 WO PCT/SE1998/001735 patent/WO1999017424A1/en not_active Ceased
- 1998-09-29 AR ARP980104870 patent/AR017274A1/en unknown
- 1998-09-29 AU AU93706/98A patent/AU736226B2/en not_active Ceased
- 1998-09-29 PL PL33955798A patent/PL339557A1/en unknown
- 1998-09-29 EP EP98946757A patent/EP1020002A1/en not_active Withdrawn
-
2000
- 2000-03-14 NO NO20001317A patent/NO20001317D0/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5036165A (en) * | 1984-08-23 | 1991-07-30 | General Electric Co. | Semi-conducting layer for insulated electrical conductors |
| US4677328A (en) * | 1984-11-08 | 1987-06-30 | Rikichi Kumakura | Generator for use on bicycle |
| US4785138A (en) * | 1985-12-06 | 1988-11-15 | Kabel Electro Gesellschaft mit beschrankter Haftung | Electric cable for use as phase winding for linear motors |
Also Published As
| Publication number | Publication date |
|---|---|
| SE9703549D0 (en) | 1997-09-30 |
| SE9703549L (en) | 1999-03-31 |
| AU9370698A (en) | 1999-04-23 |
| WO1999017424A1 (en) | 1999-04-08 |
| PL339557A1 (en) | 2000-12-18 |
| NO20001317L (en) | 2000-03-14 |
| CN1272238A (en) | 2000-11-01 |
| CA2305417A1 (en) | 1999-04-08 |
| SE513385C2 (en) | 2000-09-04 |
| NO20001317D0 (en) | 2000-03-14 |
| EP1020002A1 (en) | 2000-07-19 |
| JP2001518774A (en) | 2001-10-16 |
| AR017274A1 (en) | 2001-09-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| DA3 | Amendments made section 104 |
Free format text: THE NATURE OF THE AMENDMENT IS AS SHOWN IN THE STATEMENT(S) FILED 20000317 |
|
| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |