WO2000007286A1 - Rotating electric machine with superconducting winding and a method for manufacturing the same - Google Patents

Rotating electric machine with superconducting winding and a method for manufacturing the same Download PDF

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Publication number
WO2000007286A1
WO2000007286A1 PCT/EP1999/005313 EP9905313W WO0007286A1 WO 2000007286 A1 WO2000007286 A1 WO 2000007286A1 EP 9905313 W EP9905313 W EP 9905313W WO 0007286 A1 WO0007286 A1 WO 0007286A1
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WO
WIPO (PCT)
Prior art keywords
winding
machine according
stator
rotor
slots
Prior art date
Application number
PCT/EP1999/005313
Other languages
French (fr)
Inventor
Pan Min
Li Ming
Rongsheng Liu
Mats Leijon
Original Assignee
Abb 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 Abb Ab filed Critical Abb Ab
Priority to AU54132/99A priority Critical patent/AU5413299A/en
Publication of WO2000007286A1 publication Critical patent/WO2000007286A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K55/00—Dynamo-electric machines having windings operating at cryogenic temperatures
    • H02K55/02—Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type
    • H02K55/04—Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type with rotating field windings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Definitions

  • the present invention relates to a rotating electric machine having a rotor comprising a superconducting winding, and to a method of manufacturing such a machine.
  • the machine may in particular be a large generator.
  • a superconducting winding on the rotor of a large generator has the advantage of greatly increasing the magnetic field induced.
  • stator winding is mounted in 10 magnetic core material, such as in slots of a laminated core of sheet steel. Eddy currents in the magnetic core cause losses in the stator, and a large amount of energy is required to magnetise the rotor core.
  • the core materials are expensive and the manufacturing cost is high.
  • the present invention provides a rotating electric machine having a stator, and a rotor comprising a superconducting winding, characterised in that the stator comprises a winding support of non-metallic material having a plurality of slots and at least one insulated conductor housed in said slots.
  • the winding support may, for example, be of glass- reinforced plastic, other reinforced plastic or other composite material.
  • a magnetic core formed from insulated wound ferromagnetic wire such as iron wire or wire containing a high proportion of iron, surrounds the winding support.
  • the wire preferably has a diameter less than 5 mm, for example between 0.1 and 1 mm.
  • a magnetic field shield of very high magnetic permeability may be used to clamp the wire to the winding support and shield the environment from leaking magnetic flux.
  • the magnetic field shield may be of a nickel-iron alloy such as Mumetal .
  • the rotor may be characterised by the absence of a magnetic core.
  • the cable is preferably of the type described in our International Patent Application No W097/45924 and comprises a solid insulation system comprising at least two semiconducting layers, each layer constituting essentially an equipotential surface, and intermediate solid insulation.
  • a high voltage superconducting stator winding may alternatively be formed from a conductor of the type described in our British Patent Application GB-A-2332557 , comprising an insulation system as described in W097/45924, surrounding superconducting means and an inner support tube through which cooling fluid is passed.
  • the machine comprises a large generator having a stator comprising a conventionally conducting high voltage winding. Cooling fluid and an electric supply for the superconducting rotor winding may be fed through the rotor shaft.
  • the superconducting rotor winding may be surrounded by a thermal radiation shield which may in turn be surrounded by an outer shaft, the space between the thermal radiation shield and outer shaft being evacuated to limit heat transfer by conduction and convection.
  • a further aspect of the invention provides a method of manufacturing a rotating electric machine, comprising forming a stator winding support having a plurality of slots from non-metallic material, and threading at least one flexible insulated conductor through said slots.
  • the method comprises a further step of winding ferromagnetic wires around the outer surface of said winding support to form a magnetic core.
  • Figure 1 is a schematic longitudinal section through a generator according to the invention
  • FIG. 2 is a further schematic longitudinal section through the generator of Figure 1, showing details of the stator;
  • Figure 3 is a schematic transverse section taken along the line III-III in Figure 2;
  • Figure 4 comprises schematic sections through the stator winding at different points therealong;
  • Figures 5, 6 and 7 are schematic sectional views of parts of alternative embodiments of cable for the stator winding .
  • Figure 1 shows a high voltage generator comprising a rotor 1 and a stator 2.
  • the rotor 1 is carried by an inner shaft 3 containing a conduit 4 carrying cooling fluid and the electric supply for a superconducting coil 5 wound on the rotor.
  • the inner shaft 3 is mounted on bearings 6. Whilst the rotor 1 does not have a magnetic core per se, its coil 5 may be supported on a metal structure, since the magnetic field induced by the coil is DC (i.e. time invariant) with respect to the rotor.
  • the superconducting coil 5 is enclosed within a metallic thermal radiation shield 7 and is housed within an outer shaft 8 which, being evacuated, helps to maintain the low temperature of the superconductor.
  • the stator 2 comprises a wound high-voltage cable 9 supported on a winding support 10 which may be of a composite material such as glass -reinforced plastic.
  • a magnetic core 11 comprising insulated silicon-iron wire of diameter between 0.1 and 5 mm is wound around the outside of the winding support 10. The magnetic core 11 is clamped to the winding support by means of a magnetic field shield 16.
  • the windings of the stator 2 are formed from a cable comprising central conductive means 12, for example a multiplicity of strands of copper wire, the majority of which are insulated, surrounded in turn by a first semiconducting layer 13, an insulating layer 14 and a second semiconducting layer 15.
  • the semiconducting and insulating layers 13,14,15 comprise a polymer such as ethylene-propylene copolymer rubber, ethylene vinyl acetate copolymer/nitrile rubber, butyl grafted polyethylene, ethylene butyl acrylate copolymer, low density polyethylene, high density polyethylene, polypropylene, cross-linked polyethylene, polyvinyl chloride, ethylene-propylene-diene terpolymer or silicone rubber, the semiconductive layers 13,15 further comprising particles of carbon black.
  • the semiconducting layers may have a resistivity between 1 and 100 k ⁇ cm, which is low enough to provide an equipotential surface, but high enough to enclose the electric field.
  • the rotor cable may comprise an insulated high- temperature superconducting wire, for example of BSCCO-2212 or BSCCO-2223, where the numerals indicate the number of atoms of bismuth or lead, strontium, calcium and copper respectively. Because the rotor cable is not supplied with a high voltage, an insulating system having two semiconducting layers is not required, but may be used if desired.
  • FIGs 2 and 3 show how the stator winding 9 may be wound in two layers of slots in the winding support 10.
  • Figure 4 shows how a saving in space can be achieved by stepping down the thickness of the insulating layer 14 of the cable 9 of the stator winding.
  • the insulating layer 14 is relatively thick, whereas at a low voltage end, only a thin insulation layer is required.
  • the stator is wound with a superconducting cable.
  • Figure 5 shows a first alternative cable for the stator, comprising an inner metallic tubular support 23, e.g. of copper, on which is helically wound elongate HTS material, for example
  • a cryostat 25 arranged around outside the superconducting layer, comprises two spaced apart flexible corrugated metal tubes 26 and 27. The space between the tubes 26 and 27 is maintained under vacuum and contains thermal superinsulation 28. Liquid nitrogen, or other cooling fluid, is passed along the tubular support 23 to cool the surrounding superconducting layer 24 to below its critical superconducting temperature. Electrical insulation comprising semiconducting layers 13, 15 and an insulating layer 14 is provided in the same manner as in the cable shown in Figure 4.
  • FIG. 6 shows a second alternative design of stator winding cable comprising an HTS wire 32 instead of the superconducting layer 24 of Figure 5.
  • the HTS wire is wound helically around inner support tube 23 and embedded in a layer 33 of semiconducting plastics material which is suitably the same material as that of first and second semiconducting layers 13, 15.
  • the spacing 34 may be a void space or may incorporate a foamed, highly compressible material to absorb relative movement between layers 33 and 13. Such foamed material may be semiconductive to ensure electrical contact between these two layers. Additionally or alternatively, metal wires may be provided for ensuring such electrical contact.
  • Figure 7 shows a third alternative stator winding cable in which superconducting filaments 41 are embedded in a polymer matrix 42 surrounding a coolant channel 43.
  • stator winding cables described above are sufficiently flexible to be threaded through or otherwise inserted into the slots of the winding support 10.
  • a generator according to the invention will have a rated voltage and power a few times that of a similarly-sized conventional generator.
  • stator core losses are reduced, stator ohmic losses are reduced due to the high voltage, low current operation, rotor ohmic losses are almost eliminated and the costs of materials and manufacture are reduced.
  • stator winding of the specific embodiment of the invention which has been described above, and the insulation of the windings of a machine according to the invention in general, should be handle very high voltages and the consequent electric and thermal loads which arise at these voltages.
  • such electric machines may have a rated power from a few hundred kVA up to more than 1000 MVA and a rated voltage ranging from 3-4 kV up to very high transmission voltages of 400-800 Kv.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superconductive Dynamoelectric Machines (AREA)

Abstract

A rotating electric machine having a rotor comprising a superconducting winding is characterised in that its stator comprises a winding support (10) of non-metallic material having a plurality of slots and at least one insulated conductor (9) housed in said slots. Magnetic wire can be wound around the outside of the winding support (10) to form a magnetic core.

Description

ROTATING ELECTRIC MACHINE WITH SUPERCONDUCTING WINDING AND A METHOD FOR MANUFACTURING THE SAME
The present invention relates to a rotating electric machine having a rotor comprising a superconducting winding, and to a method of manufacturing such a machine.
5 The machine may in particular be a large generator. A superconducting winding on the rotor of a large generator has the advantage of greatly increasing the magnetic field induced.
In existing generators the stator winding is mounted in 10 magnetic core material, such as in slots of a laminated core of sheet steel. Eddy currents in the magnetic core cause losses in the stator, and a large amount of energy is required to magnetise the rotor core. The core materials are expensive and the manufacturing cost is high.
15 Most synchronous machines are of three-phase design and have a field winding in the rotor, where the main flux is generated by dc, and an ac winding in the stator.
A report from the Electric Power Research Institute, EPRI, EL-3391, from 1984 describes a review of machine 20 concepts for achieving a higher voltage generator for connection to a power network without an intermediate transformer. Such a solution is said to provide good efficiency gains and great economic advantages. The main reason for considering the development of generators for
25 direct connection to power networks in 1984 was that at the time a superconducting rotor had been produced. The large magnetization capacity of the superconducting field makes it possible to use an air gap winding with a sufficient insulation thickness to withstand the electrical stresses.
30 By combining the most promising prospect, according to the project, of designing a magnetic circuit with a winding, a so-called monolith cylinder armature, in which the winding comprises two cylinders of conductors concentrically enclosed in three cylindrical insulating casings and the whole structure being fixed to a laminated iron core without teeth, it was judged that a high voltage rotating electric machine could be directly connected to a power network.
The present invention provides a rotating electric machine having a stator, and a rotor comprising a superconducting winding, characterised in that the stator comprises a winding support of non-metallic material having a plurality of slots and at least one insulated conductor housed in said slots.
The winding support may, for example, be of glass- reinforced plastic, other reinforced plastic or other composite material.
Preferably, a magnetic core formed from insulated wound ferromagnetic wire, such as iron wire or wire containing a high proportion of iron, surrounds the winding support. The wire preferably has a diameter less than 5 mm, for example between 0.1 and 1 mm. A magnetic field shield of very high magnetic permeability may be used to clamp the wire to the winding support and shield the environment from leaking magnetic flux. For example, the magnetic field shield may be of a nickel-iron alloy such as Mumetal .
The rotor may be characterised by the absence of a magnetic core.
If the stator is wound with a conventionally conducting cable, then the cable is preferably of the type described in our International Patent Application No W097/45924 and comprises a solid insulation system comprising at least two semiconducting layers, each layer constituting essentially an equipotential surface, and intermediate solid insulation.
Similarly, a high voltage superconducting stator winding may alternatively be formed from a conductor of the type described in our British Patent Application GB-A-2332557 , comprising an insulation system as described in W097/45924, surrounding superconducting means and an inner support tube through which cooling fluid is passed.
In a particular embodiment of the invention, the machine comprises a large generator having a stator comprising a conventionally conducting high voltage winding. Cooling fluid and an electric supply for the superconducting rotor winding may be fed through the rotor shaft. The superconducting rotor winding may be surrounded by a thermal radiation shield which may in turn be surrounded by an outer shaft, the space between the thermal radiation shield and outer shaft being evacuated to limit heat transfer by conduction and convection.
A further aspect of the invention provides a method of manufacturing a rotating electric machine, comprising forming a stator winding support having a plurality of slots from non-metallic material, and threading at least one flexible insulated conductor through said slots.
Preferably, the method comprises a further step of winding ferromagnetic wires around the outer surface of said winding support to form a magnetic core.
An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings, in which: -
Figure 1 is a schematic longitudinal section through a generator according to the invention;
Figure 2 is a further schematic longitudinal section through the generator of Figure 1, showing details of the stator;
Figure 3 is a schematic transverse section taken along the line III-III in Figure 2; Figure 4 comprises schematic sections through the stator winding at different points therealong; and
Figures 5, 6 and 7 are schematic sectional views of parts of alternative embodiments of cable for the stator winding .
Figure 1 shows a high voltage generator comprising a rotor 1 and a stator 2. The rotor 1 is carried by an inner shaft 3 containing a conduit 4 carrying cooling fluid and the electric supply for a superconducting coil 5 wound on the rotor. The inner shaft 3 is mounted on bearings 6. Whilst the rotor 1 does not have a magnetic core per se, its coil 5 may be supported on a metal structure, since the magnetic field induced by the coil is DC (i.e. time invariant) with respect to the rotor.
The superconducting coil 5 is enclosed within a metallic thermal radiation shield 7 and is housed within an outer shaft 8 which, being evacuated, helps to maintain the low temperature of the superconductor.
The stator 2 comprises a wound high-voltage cable 9 supported on a winding support 10 which may be of a composite material such as glass -reinforced plastic. A magnetic core 11 comprising insulated silicon-iron wire of diameter between 0.1 and 5 mm is wound around the outside of the winding support 10. The magnetic core 11 is clamped to the winding support by means of a magnetic field shield 16.
As shown in Figure 4, the windings of the stator 2 are formed from a cable comprising central conductive means 12, for example a multiplicity of strands of copper wire, the majority of which are insulated, surrounded in turn by a first semiconducting layer 13, an insulating layer 14 and a second semiconducting layer 15. The semiconducting and insulating layers 13,14,15 comprise a polymer such as ethylene-propylene copolymer rubber, ethylene vinyl acetate copolymer/nitrile rubber, butyl grafted polyethylene, ethylene butyl acrylate copolymer, low density polyethylene, high density polyethylene, polypropylene, cross-linked polyethylene, polyvinyl chloride, ethylene-propylene-diene terpolymer or silicone rubber, the semiconductive layers 13,15 further comprising particles of carbon black. The semiconducting layers may have a resistivity between 1 and 100 kΩ cm, which is low enough to provide an equipotential surface, but high enough to enclose the electric field.
The rotor cable may comprise an insulated high- temperature superconducting wire, for example of BSCCO-2212 or BSCCO-2223, where the numerals indicate the number of atoms of bismuth or lead, strontium, calcium and copper respectively. Because the rotor cable is not supplied with a high voltage, an insulating system having two semiconducting layers is not required, but may be used if desired.
Figures 2 and 3 show how the stator winding 9 may be wound in two layers of slots in the winding support 10.
Figure 4 shows how a saving in space can be achieved by stepping down the thickness of the insulating layer 14 of the cable 9 of the stator winding. At a high voltage end of the cable, the insulating layer 14 is relatively thick, whereas at a low voltage end, only a thin insulation layer is required.
In an alternative embodiment of the invention, the stator is wound with a superconducting cable. Figure 5 shows a first alternative cable for the stator, comprising an inner metallic tubular support 23, e.g. of copper, on which is helically wound elongate HTS material, for example
BSCCO tape or the like, to form a superconducting layer 24 around the tubular support 23. A cryostat 25, arranged around outside the superconducting layer, comprises two spaced apart flexible corrugated metal tubes 26 and 27. The space between the tubes 26 and 27 is maintained under vacuum and contains thermal superinsulation 28. Liquid nitrogen, or other cooling fluid, is passed along the tubular support 23 to cool the surrounding superconducting layer 24 to below its critical superconducting temperature. Electrical insulation comprising semiconducting layers 13, 15 and an insulating layer 14 is provided in the same manner as in the cable shown in Figure 4.
Figure 6 shows a second alternative design of stator winding cable comprising an HTS wire 32 instead of the superconducting layer 24 of Figure 5. The HTS wire is wound helically around inner support tube 23 and embedded in a layer 33 of semiconducting plastics material which is suitably the same material as that of first and second semiconducting layers 13, 15. There is a small radial spacing 34 between the layer 33 and the first semiconducting layer 13 which spacing 34 provides an expansion/contraction gap to compensate for the difference between the thermal coefficient of expansion of the electrical insulation system 13, 14, 15 and that of the superconductor assembly 23, 32,
33. The spacing 34 may be a void space or may incorporate a foamed, highly compressible material to absorb relative movement between layers 33 and 13. Such foamed material may be semiconductive to ensure electrical contact between these two layers. Additionally or alternatively, metal wires may be provided for ensuring such electrical contact.
Figure 7 shows a third alternative stator winding cable in which superconducting filaments 41 are embedded in a polymer matrix 42 surrounding a coolant channel 43.
All of the stator winding cables described above are sufficiently flexible to be threaded through or otherwise inserted into the slots of the winding support 10.
Because a superconducting rotor winding can exert a magnetic field a few times stronger than that exerted by a conventional winding, it is envisaged that a generator according to the invention will have a rated voltage and power a few times that of a similarly-sized conventional generator. At the same time, stator core losses are reduced, stator ohmic losses are reduced due to the high voltage, low current operation, rotor ohmic losses are almost eliminated and the costs of materials and manufacture are reduced.
The electrical insulation of the stator winding of the specific embodiment of the invention which has been described above, and the insulation of the windings of a machine according to the invention in general, should be handle very high voltages and the consequent electric and thermal loads which arise at these voltages. By way of example, such electric machines may have a rated power from a few hundred kVA up to more than 1000 MVA and a rated voltage ranging from 3-4 kV up to very high transmission voltages of 400-800 Kv.

Claims

1. A rotating electric machine having a stator, and a rotor comprising a superconducting winding, characterised in that the stator comprises a winding support of non- metallic material having a plurality of slots and at least one insulated conductor housed in said slots.
2. A machine according to claim 1, comprising at least one length of magnetic wire wound around the outer surface of said winding support to form a magnetic core.
3. A machine according to claim 2, wherein said magnetic wire is insulated along its length.
4. A machine according to claim 2 or 3, wherein said magnetic wire has a diameter less than 5 mm.
5. A machine according to any preceding claim, wherein the rotor is characterised by the absence of a magnetic core.
6. A machine according to any preceding claim, wherein the stator comprises a conventionally conductive winding comprising conductive means surrounded in turn by a first semiconductive layer, an insulating layer and a second semiconductive layer.
7. A machine according to any one of claims 1 to 5, wherein the stator comprises a superconducting winding comprising superconductive means surrounded in turn by a first semiconductive layer, an insulating layer and a second semiconductive layer, said superconductive means being supported on an inner support tuber through which cooling fluid is passed in use.
8. A machine according to any preceding claim, wherein the superconductive rotor winding is carried by an inner shaft through which cooling fluid and an electric supply for the superconductive winding are fed.
9. A machine according to claim 8, wherein the superconductive rotor winding is surrounded by a thermal radiation shield.
10. A machine according to claim 8 or 9, wherein the superconductive rotor winding is surrounded by an evacuated outer shaft.
11. A machine according to any preceding claim, wherein the stator is surrounded by a magnetic field shield of very high magnetic permeability.
12. A large generator according to any preceding claim.
13. A method of manufacturing a rotating electric machine, comprising forming a stator winding support having a plurality of slots from non metallic material, and threading at least one flexible insulated conductor through said slots.
14. A method according to claim 13, comprising a further step of winding at least one length of magnetic wire around the outer surface of said winding support to form a magnetic core.
PCT/EP1999/005313 1998-07-27 1999-07-26 Rotating electric machine with superconducting winding and a method for manufacturing the same WO2000007286A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU54132/99A AU5413299A (en) 1998-07-27 1999-07-26 Rotating electric machine with superconducting winding and method for manufacturing the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9816278.7 1998-07-27
GB9816278A GB2339975A (en) 1998-07-27 1998-07-27 Rotating electric machine stator

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007015168A1 (en) * 2007-03-27 2008-10-02 Trithor Gmbh Linear machine with a primary part and a secondary part
DE102008025703A1 (en) * 2008-05-29 2009-12-10 Siemens Aktiengesellschaft Electrical machine i.e. synchronous machine, has rotor rotatably and movably supported to stator, where stator has stator winding that is made of copper and material comprising nano-tubes such as carbon nano-tubes
WO2011014934A1 (en) 2009-08-03 2011-02-10 Atlas Copco Airpower Turbocompressor system
US8212437B2 (en) 2003-04-28 2012-07-03 General Electric Company Superconducting multi-pole electrical machine

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Publication number Priority date Publication date Assignee Title
DE10039964A1 (en) * 2000-08-16 2002-03-07 Siemens Ag Superconducting device with a cooling unit for cooling a rotating, superconducting winding
DE10137270A1 (en) 2001-07-31 2003-02-20 Aloys Wobben Wind energy installation has a ring generator with a stator having grooves spaced at intervals on an internal or external periphery for receiving a stator winding.

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GB2140195A (en) * 1982-12-03 1984-11-21 Electric Power Res Inst Cryogenic cable and method of making same
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8212437B2 (en) 2003-04-28 2012-07-03 General Electric Company Superconducting multi-pole electrical machine
DE102007015168A1 (en) * 2007-03-27 2008-10-02 Trithor Gmbh Linear machine with a primary part and a secondary part
DE102008025703A1 (en) * 2008-05-29 2009-12-10 Siemens Aktiengesellschaft Electrical machine i.e. synchronous machine, has rotor rotatably and movably supported to stator, where stator has stator winding that is made of copper and material comprising nano-tubes such as carbon nano-tubes
WO2011014934A1 (en) 2009-08-03 2011-02-10 Atlas Copco Airpower Turbocompressor system
US9470238B2 (en) 2009-08-03 2016-10-18 Atlas Copco Airpower, Naamloze Vennootschap Electric motor having segmented stator windings

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GB9816278D0 (en) 1998-09-23
AU5413299A (en) 2000-02-21
GB2339975A (en) 2000-02-09

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