WO2007141489A2 - Machine Électrique - Google Patents

Machine Électrique Download PDF

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Publication number
WO2007141489A2
WO2007141489A2 PCT/GB2007/002017 GB2007002017W WO2007141489A2 WO 2007141489 A2 WO2007141489 A2 WO 2007141489A2 GB 2007002017 W GB2007002017 W GB 2007002017W WO 2007141489 A2 WO2007141489 A2 WO 2007141489A2
Authority
WO
WIPO (PCT)
Prior art keywords
core
laminae
magnetic material
electric machine
pole
Prior art date
Application number
PCT/GB2007/002017
Other languages
English (en)
Other versions
WO2007141489A3 (fr
Inventor
Frank Moeller
Karl-Heinz Knoerzer
Original Assignee
Nexxtdrive Limited
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 Nexxtdrive Limited filed Critical Nexxtdrive Limited
Publication of WO2007141489A2 publication Critical patent/WO2007141489A2/fr
Publication of WO2007141489A3 publication Critical patent/WO2007141489A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • 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
    • H02K1/08—Salient poles
    • 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
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H02K1/148—Sectional cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F2003/106—Magnetic circuits using combinations of different magnetic materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0233—Manufacturing of magnetic circuits made from sheets
    • H01F41/024—Manufacturing of magnetic circuits made from deformed sheets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material

Definitions

  • the present invention relates to a core and a method for making a core for use in an electric machine.
  • the magnetic properties of laminae made of suitable types of cold rolled steel or iron strips can be desirable. These properties include anisotropic magnetic permeability that is determined by the grain orientation following rolling, and where permeability is lowest in the direction of a given alignment arising from the rolling operation. Aligned appropriately, this can help to keep the magnetic flux concentrated within the material, reducing losses due to stray electrical fields.
  • Soft iron generally has isotropic magnetic properties and hence exhibits a certain amount of stray magnetic field, thus leading to a reduction in efficiency.
  • Cold rolled iron however, can have a very low magnetic permeability in the direction of roll and is therefore widely used for producing concentrated electric fields.
  • Figure 1 shows a cross-section of a stator of a known radial flux machine.
  • the radial flux machine has a magnetic core 10 that is made of a plurality of stamped metal members arranged in a stack.
  • the stamped metal members include a yoke portion 12 mechanically and magnetically coupled to poles 14.
  • Each pole 14 is provided with respective coil windings 16 in the slots 18 defined between the poles.
  • FIG. 1 allows for complex configurations of poles and slots to be manufactured economically as the sheet metal used may be stamped.
  • stamping from cold rolled iron can result in non-optimal electrical performance, as each of the poles will have the same grain orientation, but when placed in situ in a rotary electric machine, will be arranged at different angles and will therefore result in different magnetic reluctances. In this situation, steps would need to be taken to randomise the grain structure of such metal stampings to diminish their anisotropic qualities.
  • Shown in Figure 2 is a conventional axial flux machine where a rotor 28 is located between two parallel disc-shaped stators 20, 20' with poles formed on the stator facing inwards to the rotor.
  • the stators 20, 20', and poles 24, 24', 24a, 24a' are connected to the respective stators mechanically and magnetically via respective yokes 22, 22'.
  • the poles and yokes are manufactured as unitary bodies and are formed from sintered iron or a mixture of iron powder and resin, thereby resulting in a magnetic material having substantially uniform magnetic properties.
  • the sintering process used to obtain this magnetic material is relatively complex and expensive and forming the magnetic material from an iron and resin mixture results in a material having relatively poor magnetic and thermal properties.
  • Figure 3 shows another form of an axial flux machine.
  • This axial flux machine has the same general configuration of that shown in Figure 2.
  • the poles are formed as individual discrete pieces 34 which are attached to respective backing plates 32, by means of fasteners 33.
  • these fasteners are machine screws.
  • the backing plates 32 can be made from spirally wound steel strips function as back iron to complete the magnetic circuits.
  • the rotor rotates between the pairs of poles.
  • the poles 34 shown in Figure 3 have uniform magnetic properties and may, for example, be made of sintered iron or a mixture of iron and resin.
  • the present invention seeks to provide improved magnetic cores for all types of electric machine.
  • a core for use in an electric machine comprising an anisotropic region of magnetic material embedded in isotropic magnetic material.
  • anisotropic magnetic material in itself, increases the permeability of a magnet.
  • the use of anisotropic material by its nature, may result in air gaps being formed in the core.
  • air gaps having very low permeability may be formed between the various laminae. The presence of air gaps within the anisotropic region reduces the overall permeability of the region resulting in reduced efficiency of the magnetic material.
  • the present inventors have recognised that if these air gaps are replaced with an isotropic magnetic material, despite this isotropic material having a lower relative permeability than the anisotropic region, then the permeability of the core once again increases, resulting in overall increased efficiency of the magnetic material.
  • the anisotropic region may be formed of any suitable means. However, preferably, the anisotropic region is formed of a plurality of laminae of grain- oriented magnetic material, for example cold-rolled steel sheets.
  • the isotropic region is formed of a mixture of resin and iron powder and use of the mixture of resin and iron powder enables the laminae to be set in place.
  • the ratio of iron powder within the resin should be as high as possible to result in the best overall properties. For example, a ratio of 90% iron suspended in 10% resin has been found to be effective.
  • the core forms part of a magnetic circuit of an electric machine.
  • grains in the steel sheets are oriented in substantially the same direction along the length of each grain-oriented steel sheet and the laminae are arranged such that the permeability of the core is maximised in directions transverse to a flat side of the steel sheets.
  • the laminae may be arranged in the form of a ring.
  • the laminae of at least one section of the core are arranged substantially parallel to one another.
  • the core forms part of a pole for use in a rotary electric machine.
  • the pole has a first surface that, in use, is arranged to abut a rotor/stator of a rotary electric machine, and a second surface that faces the other of the stator/rotor.
  • a first surface that, in use, is arranged to abut a rotor/stator of a rotary electric machine, and a second surface that faces the other of the stator/rotor.
  • any other known orientation of pole with respect to a rotor/stator combination may be used.
  • the laminae extend from the first surface of the pole towards the second surface in a substantially parallel direction, such that the region of maximum permeability radiates outwards from a direction transverse to the path between the first surface and the second surface. More preferably, at least one of the laminae extends further than the remainder of the laminae in a direction deviating from the substantially parallel direction.
  • the laminae are arranged in substantially concentric layers.
  • the mixture is arranged to adhere the pole to the rotor/stator of the rotary electric machine. This prevents the need for cumbersome and expensive fastening pieces.
  • the core forms part of a stator for use in a radial flux machine.
  • the core forms part of a transformer.
  • transformer core may be formed using the core of the present invention. Where the transformer core is designed to be formed in two parts, the mixture may be used to adhere the two parts together.
  • the present invention also extends to an electric machine comprising a core as described above.
  • the present invention further extends to a method of forming a core for use in an electric machine, said core having an anisotropic region of magnetic material embedded in an isotropic magnetic material, the method comprising the steps of: arranging the magnetic material forming the anisotropic region according to the function of the core; distributing the isotropic magnetic material within the anisotropic region; and applying heat and/or pressure to set the resultant structure.
  • any means to distribute the isotropic material through the anisotropic region may be used, however, the method may further comprise the step of agitating the core to ensure even distribution of the isotropic material within the anisotropic material.
  • Figure 1 shows a cross-section of a known radial flux machine
  • Figure 2 shows a cross-section of a known axial flux machine
  • Figure 3 shows a cross-section of an alternative known axial flux machine
  • Figure 4a shows a plan view of a first embodiment of a pole piece of the present invention
  • Figure 4b shows a cross-section through A-A of Figure 4a
  • Figure 5 shows a view of a stator with poles for use in an axial flux machine
  • Figure 6a shows a plan view of a second embodiment of a pole piece of the present invention
  • Figure 6b shows a cross-section through A-A of Figure 5a
  • Figure 7a shows a plan view of a third embodiment of a pole piece of the present invention.
  • Figure 7b shows a cross-section through A-A of Figure 6a
  • Figure 8a shows an embodiment of a stator of the present invention
  • Figure 8b shows a cross-section through A-A of Figure 7a
  • Figure 9 shows a transformer having a C-shaped core of the present invention.
  • Figure 10 shows a transformer having an E-shaped core of the present invention.
  • the present invention is applicable in general to electric machines, for example, motors, generators and transformers, having a core formed of a plurality of laminae.
  • electric machines for example, motors, generators and transformers, having a core formed of a plurality of laminae.
  • the invention will hereinafter be described generally in terms of its use in a rotary electric machine, for example a motor or generator. However, where applicable, examples of its use in other electric machines will be given.
  • Figures 4a, 4b, 6a, 6b, 7a and 7c show embodiments of poles that include cores of the present invention.
  • both radial and axial flux machines are known in the art and further description of the operation of such machines is not given.
  • both radial and axial flux machines in the simplest embodiments, include a rotor, stator and poles.
  • the magnetic flux generated in a radial flux machine extends in a radial direction from the axis of rotation.
  • the magnetic flux generated in an axial flux machine extends along the axis of rotation of the rotor.
  • poles shown in Figures 4a, 4b, 6a, 6b, 7a and 7c may be adapted for use with either radial or axial flux machines.
  • Figures 4 and 6 will be described in relation to their use with an axial flux machine and Figure 7 will be described in relation to its use with a radial flux machine.
  • Each of the embodiments shown has a core 144 made up of a plurality of laminae.
  • the laminae forming the core are strips of grain-oriented steel and are aligned to result in a core having anisotropic properties.
  • the anisotropic region is made up of steel sheets formed by cold rolling to orient the grains.
  • the grains are oriented in substantially the same direction along the length of the respective steel sheets.
  • this area of anisotropic magnetic material may be achieved by any other suitable means.
  • Figures 4a and 4b show a pole 40 for use in an axial flux machine.
  • the pole 40 has a first face 41 that, when placed in a rotary electric machine, defines one end of an air gap in use, and a second face 43 that will abut the frame or stator of an axial flux machine.
  • the pole 40 has a core 144 made up of a plurality of laminae of grain-oriented steel strips.
  • the steel strips 44 are embedded in an iron powdered resin mixture and extend from the second face 43 towards the first face 41 of the pole. Embedding the laminae in the iron powdered resin mixture allows the desired surface typography of the pole pieces to be obtained to result in the desired flux dimensions.
  • the steel strips are arranged with the grain orientation aligned in substantially the same direction to present a low magnetic permeability path between the first and second faces of the pole, and a relatively high permeability in a direction transverse to the path between the first and second faces. In this respect, the laminae effectively channel their magnetic energy parallel to the grain structure.
  • windings for creating a magnetic circuit will be arranged around the pole, between the first and second faces, such that the permeability will be strongest in the direction of the windings.
  • the core is formed of as many steel strips as it is possible to locate in the region without compromising its anisotropic properties.
  • the arrangement of the laminae for example, as shown in Figure 4a results in air gaps 48 between the respective laminae and between the ends of the laminae and the respective faces of the pole.
  • These air gaps have a much lower permeability compared to the steel sheets, and the presence of the air gaps in the core results in an overall decrease in efficiency of the core.
  • Replacing these air gaps with an isotropic magnetic material, having a higher relative permeability than the air gaps increases the overall efficiency of the core and results in the maximum potential permeability in the direction of magnetic flux.
  • the isotropic magnetic material may be formed of a mixture of iron powder and resin. Pressure and moderate temperatures are applied to the mixture when in position to set the structure around the steel sheets.
  • the ratio of iron powder within the resin should be as high as possible to result in the best overall magnetic properties, for example, a mixture of approx 90 % iron suspended in 10 % resin may be used.
  • each of the steel strip members abuts the second face 43, while the opposite ends 44a extend towards the first face 41 of the pole.
  • the steel strip members may all be the same length.
  • the opposite ends 44a of some of the outer strips may extend beyond the ends of the remainder of the strips.
  • the additional sections of these elongated strips are angled away from the common axis of alignment of the remainder of the strips. This results in an improved flux distribution at the first face 41 of the pole without the need to provide a correspondingly large cross-section of magnetic material at the extreme edges.
  • a through bore 46 is provided through the centre of the pole to accommodate a fastener (not shown).
  • a pole can be located, for example, in an axial flux machine as shown in Figure 3.
  • the second face 43 could be arranged to abut the surface of the stator facing the rotor (or both surfaces if the rotor is provided between two stators) with the first face 41 of the pole defining an edge of the air gap between the pole and the rotor.
  • Several poles could be arranged along the edge of a disc shaped stator with an outer edge 49 of the pole 40 located adjacent the circumference of the stator as shown in Figure 5.
  • the bore 46 in the embodiment shown is manufactured as part of the casting process of the pole.
  • the bore may be provided subsequent to the casting process by, for example, drilling through a region that has purposefully been provided free of laminations.
  • the strips are of a generally planar configuration with the exception of the angled ends 44a previously referred to.
  • This arrangement can provide a good filling density over the entire cross-section of the pole pieces, with strips of appropriate size being provided to fill all available space.
  • This arrangement is particularly useful for the construction of poles for axial flux machines which have a non-rectangular shape.
  • the resin powder mixture fills all cavities and crevices and also surrounds the laminae.
  • Figure 6 shows a second embodiment of a pole 50. Again, this pole will be described in relation to its use in an axial flux machine.
  • the pole 50 has a core 144 again made of a plurality of laminae 52.
  • the laminae 52 of this embodiment are arranged in substantially concentric layers.
  • the layers of steel are shown in Figure 6a to be circular, they may not be circular in the mathematical sense.
  • a core of this structure may conveniently be fabricated by continuously winding a long strip of grain orientated steel in the form of a spiral, leaving an area in the centre through which a bore may be formed. Once the spiral has been formed, a slot 151 is cut into the core to avoid eddy currents which would otherwise result. This slot is then filed with the iron powder resin mixture.
  • the spiral formation may be formed by obtaining several strips of steel and arranging them in generally concentric layers.
  • each of the laminae extending to the same length.
  • the lengths could be varied to achieve the effect shown in Figure 4a by, for example, tapering the length of the steel strip towards its end to result in the coil being wider towards its outside. Once the coil is formed, these elongated laminae could be pressed such that they extend in an angle away from the angle or orientation of the remainder of the laminae.
  • the strips (laminae) are arranged such that the grain orientation produces a low magnetic permeability between the first and second surfaces, with a greater relative permeability in a transverse direction.
  • the external topography of the pole piece shown in Figure 6 is defined by a cast iron dust resin portion 52.
  • a bore 56 may be provided for attachment to a yoke of a stator. Poles as shown in Figure 6 may be arranged on a disc-shaped stator as described with reference to Figure 5.
  • Figure 7 shows an embodiment of a pole 160 for use with a radial flux machine.
  • the embodiment shown is specific to use with a radial flux machine, it will be appreciated that a similar arrangement of core, with minor modifications to the pole itself, could be used with an axial flux machine.
  • the pole 160 has a first face 61 that, when located in a radial flux machine, defines one edge of an air gap between the rotor and stator of the machine.
  • a second face 63 is arranged to engage the yoke or rotor/stator of the machine (depending on the machine type).
  • the pole has a core 144 made of a plurality of laminae in the form of substantially planar sheets of grain-oriented steel.
  • the sheets are arranged accordingly to result in substantially parallel grain orientation.
  • the portion 62 of the pole piece which defines the edge of the air gap when in use is formed using iron powdered resin mixture.
  • the outer sheets of the core of the pole piece shown in Figure 7b are elongated in comparison to the remainder of the laminae.
  • the end sections 64a of these outer strips are inclined at an angle to the axis of - U -
  • a bore 66 is provided to accommodate a fastener (not shown) for fastening the pole piece to the relevant part of the radial flux machine.
  • FIG 8a An example of a yoke to which the pole described in Figure 7 may be attached is shown in Figure 8a. From this diagram it can be seen that the pole may be attached to the inner or outer edge of the ring.
  • the embodiment shown in Figure 7b is clearly designed for being attached to the outer edge of the ring, as can be seen the nature of the curved faces 60, 63. However, by reversing the curved faces, i.e. changing the convex surface to a concave surface, the pole could be adapted for use on the inner edge of the ring. In either case, the second face 63 would be arranged to abut the inner/outer edge of the ring (yoke).
  • the first face would define the edge of the air gap formed between the poles and a rotor located inside the ring.
  • the first face would define the edge of the air gap formed between the poles and a stator located outside the ring.
  • the laminae do not extend through the isotropic region of iron powder resin mixture forming the first surface of each respective pole piece. It will, however, be appreciated that it would be possible for at least some of the laminae to extend to this surface.
  • FIG 8 shows a stator 70 for use in a radial flux machine.
  • the stator 70 is in the form of a ring 72 made up of a plurality of turns of wound steel strip 73 to form a spring-like coil of steel strip.
  • a flat face of the wound strip is orientated at 90° to the winding axis.
  • the wound steel strip forms a plurality of concentric laminae stacked together.
  • the strip 73 When manufactured, the strip 73 is wound from a substantially straight strip.
  • the action of conforming the strip to the concentric shape naturally leads to compression of the radially inner region of the steel strip and tension in the radially outer region.
  • the tension in the outer region leads to a natural "thinning" of the outer edge of steel strip.
  • gaps are formed between the laminae along the outer edge 171 and the previously rectangular cross-section of the laminae is distorted to a trapezoidal cross-section.
  • the ring is impregnated with the iron powder resin mixture, thereby filling the air gaps at the radially outer edge and reducing the reluctance.
  • the strips are specifically arranged for the grain orientation to be aligned to result in a relatively low magnetic reluctance in a radial direction.
  • the poles 74, 76 shows in Figure 8a are produced during the impregnation operation by casting using the iron powder resin, allowing impregnation of the ring and fabrication of the poles to be carried out in a single operation.
  • use of the epoxy resin results in the mixture having an adhesive quality.
  • the poles may be attached to the ring without requiring the use of additional fastening means.
  • Figures 9 and 10 show a core as described above in use in two forms of transformer. Specifically, Figure 9 shows a C-shaped core of a transformer and Figure 10 shows an E-shaped core of a transformer.
  • the core is formed of a plurality of laminae 82, 92 of grain-oriented steel, forming the anisotropic region of the core.
  • the laminae are embedded in the iron powder and resin mixture described above.
  • the mixture is also provided between respective ends 84, 94 of the laminae where required.
  • the laminae may be arranged in the required manner.
  • the core may be impregnated with the iron powder and resin mixture and vibrated to ensure even distribution of the mixture, and to ensure that all gaps are filled by the mixture.
  • the core may be subjected to high pressure and moderate temperatures, to cure the assembly and to ensure that the configuration of the core is set in its intended form.
  • Embodiments of the various poles have been described for use specifically with a stator. However, the skilled person will appreciate that the poles may be adapted in accordance with the type of rotor or stator used in a particular type of machine.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

L'invention concerne un noyau pour utilisation dans une machine électrique, ledit noyau incluant une zone de matériau magnétique anisotrope insérée dans un matériau magnétique isotrope. La zone anisotrope est formée d'une pluralité de plaques minces de matériau magnétique à grains orientés formé de feuilles d'acier réalisées par laminage à froid. La zone isotrope est formée d'un mélange de résine et de poudre de fer.
PCT/GB2007/002017 2006-06-02 2007-05-31 Machine Électrique WO2007141489A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0610933.4 2006-06-02
GB0610933A GB0610933D0 (en) 2006-06-02 2006-06-02 Electric machine

Publications (2)

Publication Number Publication Date
WO2007141489A2 true WO2007141489A2 (fr) 2007-12-13
WO2007141489A3 WO2007141489A3 (fr) 2008-01-31

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Application Number Title Priority Date Filing Date
PCT/GB2007/002017 WO2007141489A2 (fr) 2006-06-02 2007-05-31 Machine Électrique

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GB (1) GB0610933D0 (fr)
WO (1) WO2007141489A2 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011003718A2 (fr) * 2009-07-07 2011-01-13 Gerhard Riepl Stator et procédé de production d'un stator
WO2010092403A3 (fr) * 2009-02-13 2011-06-23 Isis Innovation Ltd Machine électrique - flux
EP2750151A1 (fr) * 2011-07-27 2014-07-02 Sumitomo Electric Industries, Ltd. Briquette en poudre comprimée
US9054566B2 (en) 2009-04-14 2015-06-09 Isis Innovation Ltd Electric machine—evaporative cooling
EP2999087A1 (fr) * 2014-09-19 2016-03-23 Siemens Aktiengesellschaft Machine électrique ayant une dispersion d'encoche magnétique faible
US9318938B2 (en) 2009-02-13 2016-04-19 Isis Innovation Ltd. Electric machine-modular
US9496776B2 (en) 2009-02-13 2016-11-15 Oxford University Innovation Limited Cooled electric machine
US10734848B2 (en) 2014-11-07 2020-08-04 Ford Global Technologies, Llc Fixtures and methods for forming aligned magnetic cores

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3408573A (en) * 1965-06-19 1968-10-29 Philips Corp Coil core manufactured from softmagnetic and permanent-magnetic materials
US5994814A (en) * 1996-07-08 1999-11-30 Toyota Jidosha Kabushiki Kaisha Reluctance motor having magnetic poles formed by laminating steel plates in circumferential direction
WO2005101614A1 (fr) * 2004-04-06 2005-10-27 Hitachi Metals, Ltd. Rotor et procédé de fabrication de celui-ci

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3408573A (en) * 1965-06-19 1968-10-29 Philips Corp Coil core manufactured from softmagnetic and permanent-magnetic materials
US5994814A (en) * 1996-07-08 1999-11-30 Toyota Jidosha Kabushiki Kaisha Reluctance motor having magnetic poles formed by laminating steel plates in circumferential direction
WO2005101614A1 (fr) * 2004-04-06 2005-10-27 Hitachi Metals, Ltd. Rotor et procédé de fabrication de celui-ci

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9318938B2 (en) 2009-02-13 2016-04-19 Isis Innovation Ltd. Electric machine-modular
WO2010092403A3 (fr) * 2009-02-13 2011-06-23 Isis Innovation Ltd Machine électrique - flux
US9071117B2 (en) 2009-02-13 2015-06-30 Isis Innovation Ltd. Electric machine—flux
US9496776B2 (en) 2009-02-13 2016-11-15 Oxford University Innovation Limited Cooled electric machine
US9054566B2 (en) 2009-04-14 2015-06-09 Isis Innovation Ltd Electric machine—evaporative cooling
WO2011003718A3 (fr) * 2009-07-07 2011-10-13 Gerhard Riepl Stator et procédé de production d'un stator
WO2011003718A2 (fr) * 2009-07-07 2011-01-13 Gerhard Riepl Stator et procédé de production d'un stator
EP2750151A1 (fr) * 2011-07-27 2014-07-02 Sumitomo Electric Industries, Ltd. Briquette en poudre comprimée
EP2750151A4 (fr) * 2011-07-27 2015-03-11 Sumitomo Electric Industries Briquette en poudre comprimée
US9251946B2 (en) 2011-07-27 2016-02-02 Sumitomo Electric Industries, Ltd. Compact
EP2999087A1 (fr) * 2014-09-19 2016-03-23 Siemens Aktiengesellschaft Machine électrique ayant une dispersion d'encoche magnétique faible
WO2016041857A1 (fr) * 2014-09-19 2016-03-24 Siemens Aktiengesellschaft Machine électrique à faibles fuites magnétiques au niveau de rainures
CN106716781A (zh) * 2014-09-19 2017-05-24 西门子公司 具有低的槽漏磁的电机器
US10236730B2 (en) 2014-09-19 2019-03-19 Siemens Aktiengesellschaft Electric machine with low magnetic slot leakage
CN106716781B (zh) * 2014-09-19 2019-09-06 西门子公司 具有低的槽漏磁的电机器
US10734848B2 (en) 2014-11-07 2020-08-04 Ford Global Technologies, Llc Fixtures and methods for forming aligned magnetic cores

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Publication number Publication date
WO2007141489A3 (fr) 2008-01-31
GB0610933D0 (en) 2006-07-12

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