WO2020201937A1 - Machine électrique dotée d'un élément de rotor comprenant de la magnétite - Google Patents

Machine électrique dotée d'un élément de rotor comprenant de la magnétite Download PDF

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Publication number
WO2020201937A1
WO2020201937A1 PCT/IB2020/052844 IB2020052844W WO2020201937A1 WO 2020201937 A1 WO2020201937 A1 WO 2020201937A1 IB 2020052844 W IB2020052844 W IB 2020052844W WO 2020201937 A1 WO2020201937 A1 WO 2020201937A1
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WO
WIPO (PCT)
Prior art keywords
magnetite
magnetic field
stator
rotor
machine
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/IB2020/052844
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English (en)
Inventor
Kabu Walter MAKGERU
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.)
Trustees For Time Being Of Kmn Fulfilment Trust
Original Assignee
Trustees For Time Being Of Kmn Fulfilment Trust
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 Trustees For Time Being Of Kmn Fulfilment Trust filed Critical Trustees For Time Being Of Kmn Fulfilment Trust
Publication of WO2020201937A1 publication Critical patent/WO2020201937A1/fr
Priority to ZA2021/05687A priority Critical patent/ZA202105687B/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K99/00—Subject matter not provided for in other groups of this subclass
    • H02K99/20—Motors
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K99/00—Subject matter not provided for in other groups of this subclass
    • H02K99/10—Generators

Definitions

  • This disclosure relates to electric power machines (e.g., generators and motors) and specifically to a rotor or rotors that are used in electric power machines. It relates more specifically to a material composition of the rotor which may augment or enhance a magnetic field in the electric power machine.
  • electric power machines e.g., generators and motors
  • a material composition of the rotor which may augment or enhance a magnetic field in the electric power machine.
  • a magnetic field is produced by electromagnets and/or permanent magnets.
  • the electromagnets are made by using current carrying conductors wound around a steel core to generate a controllable magnetic field and the permanent magnets are made to have fixed magnetic poles with fixed unchangeable magnetic field. Both these types of magnetic field source magnets are well known in the industry and widely used in the industry for use in generator applications and motors.
  • These magnetic field source magnets may have weaknesses such as needing a steel core and conductors and electric current to generate magnetic field to function properly.
  • the steel core is usually an electric steel material which is expensive and heavy. This electric steel must be machined with special machinery and this raises its costs.
  • the conductors are mostly made of material comprising copper metal as a conductor of the current to generate the magnetic field. Copper itself is an expensive metal and has a very high density, and it is therefore heavy as well. The fact that the electric steel and the copper make up the electromagnet causes it to be heavy which may stress on bearings and a steel structure that carry them, especially during rotation as a result of the centrifugal forces.
  • the current in the conductors generates heat in the electromagnets which then need cooling.
  • the electromagnets can be in the rotor and in some cases in a return path of the magnetic field. In both cases, current is supplied to the electromagnets and cooling may be important.
  • the current to the field coils may be supplied via a brush and slip ring system.
  • the field coils are subject to large centrifugal forces due to the rotation of the rotor. In order to secure the field coils, they are often coated in a resin and lodged into coil slots on the rotor body and sometimes wedges are used to secure them in place.
  • using the electromagnets, especially in the rotor, as the primary sources of magnetic flux in the machine may have limitations, namely the need for a brush and slip ring system and the need to secure the field coils in order to withstand the centrifugal forces.
  • Magnetite is ferrous and thus has ferromagnetic properties.
  • the Applicant’s own prior PCT Application No. IB/2017/056569 discloses use of magnetite in an electromagnet in an electric power generator.
  • This electromagnet is made with a steel core and magnetite together with conductors through which current flows and generate magnetic field to be used in the power generator.
  • This electromagnet as described still has the characteristic of electromagnets in that it uses the electric steel which has got a disadvantage that it is heavy and expensive, etc. and has copper windings.
  • US5628900 discloses magnetite for use in water purification. This particular application is far removed from power generation application which has its own challenges like cooling and rotation of the rotor and losses too.
  • the present disclosure aims to solve or reduce the abovementioned weaknesses of electromagnets and permanent magnets and still generate enough magnetic field for electric power generation.
  • an electric power machine which includes: a first rotor member including a magnetic field source configured to produce a magnetic field with at least one pair of magnetic poles; and
  • stator provided around, or radially outward of, the first rotor member, the stator including a plurality of windings, characterised in that the electric power machine includes:
  • a second rotor member provided around, or radially outward of, the stator, the second rotor member comprising a magnetite material, the second rotor member being arranged to have induced therein a magnetic polarity by the magnetic field generated by the first rotor member, the polarised second rotor member then serving to direct or enhance the magnetic field generated by the first rotor member.
  • the electric power machine may be an electric power generator or an electric power motor.
  • the windings may be configured to generate a current induced by the magnetic field.
  • the magnetite material may comprise at least magnetite (e.g., magnetite powder) and a binder.
  • the binder may be a resin.
  • the magnetite material may be sintered magnetite granules or powder.
  • the second rotor member may comprise a plurality of magnetite elements.
  • Each magnetite element may be in the form of an arcuate section.
  • Each magnetite element may be radially aligned with one of the poles operatively generated by the first rotor member.
  • the stator may be a first stator member and there may be plural stator members including at least a second stator member.
  • the second stator member may be provided inside the first rotor member.
  • a structure of the electric power generator may be (moving from a central axis radially outwardly): the second stator member; the first rotor member; the first stator member; and the second rotor member.
  • the second stator member maybe hollow, e.g., being cylindrical.
  • the electric generator may be radially scalable meaning that more rotor and/or stator members may be added. This may have the advantage of a higher power density at a cost of complexity.
  • the first and second rotor members may be relatively fixed, meaning that they maintain their relative circumferential orientation during rotation.
  • the disclosure may disclose a concept whereby secondary magnetic fields are generated by linking a primary magnetic field (i.e. , the magnetic field generated by the first rotor member) with the materials that are magnetisable and polarisable and then produce their own magnetic fields, e.g., when an iron material or fine grounded magnetite block or steel is brought close to a magnetic field either an electromagnet or a permanent magnet, this sintered magnetite material assumes an opposite polarity to that of the facing magnet that is when a North pole of Magnet faces a sintered fine ground magnetite mixed with resin block/suitable shape the block gets a polarity of South pole and also gets a magnetic field strength up to 100% of the magnet field facing it depending on distance between the two.
  • a primary magnetic field i.e. , the magnetic field generated by the first rotor member
  • this sintered magnetite material assumes an opposite polarity to that of the facing magnet that is when a North pole of Magnet faces a sintered fine ground magnetite mixed with resin block/suitable
  • the magnetite block adds magnetic field to the magnetic circuit and increases the magnetic field in the circuit by about 27% (based on measurements one a prototype built by the Inventor).
  • This magnetite material by itself generates very little to no magnetic field, but when a magnet field is close enough such that the magnetic field of the electromagnet or permanent magnet links with the block, it may generate about up to 100% of the closer magnet magnetic field strength.
  • This idea may be used in an electric power generator, and there must be a primary source of Magnetic field, either an electromagnet, a permanent magnet or windings with current flowing in them close enough for its field to link with the iron material or magnetite block and with large enough magnetic field.
  • the present disclosure proposes the concept of augmenting magnetic field from secondary sources of magnetic field by linking the magnetic field from a primary magnetic field source to a secondary magnetic field source, the primary magnetic field source are electromagnets and permanent magnets even the magnetic field from the stator/armature may serve as the primary source of the magnetic field to excite the secondary source of the magnetic field as long as it happens such that the magnetic field from the primary source links with the material comprising magnetite material, the stator winding has induced therein an electric current.
  • This embodiment may be suitable for stationary/rotating parts such as the return path, a stationary secondary magnetic field source and the central shaft and rotors as well because there is no current fed into these windings and therefore no need for slip ring arrangement.
  • the stator may have windings in the teeth to enhance the primary magnetic field.
  • This embodiment may be in the form of two rotors sandwiching a stationary secondary source of magnetic field.
  • the primary magnetic field source is original magnetic field that links with the magnetite material and excite the magnetic material like magnetite to generate its own magnetic field.
  • the magnetite for use in this application may be ground very fine and to lose its permanent magnet properties of fixed magnetic field strength and its fixed magnetic poles.
  • the magnetite material assumes an opposite polarity, that is when the primary source of the magnetic field is north pole (N) the magnetite material becomes a south pole (S), and also may assume about +100% of the primary magnetic fields strength when the magnetic linking is from one surface, when the magnetic linking is from both the surfaces such that the magnetite material is sandwiched between to primary sources of magnetic field that have attracting polarities, north-south pole relationship, the magnetic field of the secondary sources of the magnetic field is raised higher by about +25% depending on the airgap between the primary source of the magnetic field and secondary source of the magnetic field, the magnetic field strength of the primary source of the magnetic also may increase by +10% compared to when it is alone, so the secondary source of magnetic field, once activated with the magnetic field from the primary magnetic add to the overall magnetic field of the magnetic circuit such the magnetic field of the
  • a relatively small permanent magnet may be embedded in the sintered magnetite mixed with resin.
  • the sintered magnetite mixed with resin may act as a primary source of magnetic field and will also enhance the magnetic field of the magnetite material.
  • Magnetite as a material is very soft and therefore when the sintered magnetite mixed with material is used on the surface of a secondary or primary source of magnetic field, the airgap between this sintered magnetite and any other surface may be less than 1 mm. Because of the distance that will be created by presence of the stator between the primary source and the secondary source of magnetic field, the magnetic flux strength may be 1 .5 Tesla or more in the airgap. The optimum distance between the stator and the secondary source of the magnetic field may be twice the thickness of the secondary source of the magnetic field.
  • the adjacent source of magnetic field may be a secondary source of magnetic field. Every primary source of magnetic field may be bordered by a secondary source of magnetic field on both surfaces of the primary source of the magnetic field in a rotor structure.
  • the magnetite rotor may rotate while the primary source of the magnetic field may be stationery where the airgap between the two layers will be very small to almost non-existence and the surfaces are touching to enhance the secondary magnetic field source generation.
  • the embodiment of this disclosure may be arranged such that there are two rotors one with primary sources of magnetic field and the other rotor with magnetite as the secondary source of magnetic field.
  • the other embodiment of this disclosure is where the primary source of magnetic field is on the return path and the secondary source of the magnetic field is the rotor. Therefore, the rotor is the magnetite material, in this case the rotor made of magnetite will be very light and reduce the rotational mass of the rotating member.
  • magnetite compared to copper and electric steel is cost.
  • Magnetite sells for about ZAR1 ,000/ton and copper sells for about USD6, 000/ton ( ⁇ ZAR85,000), electric steel sells for about USD3500/ton and based on cost alone the magnetite rotor is much more affordable.
  • the fine magnetite mixed with resin is more than two times lighter than the electromagnet and therefore embodiments with rotors made of this magnetite may operationally be cost effective.
  • the electromagnets made of electric steel, copper windings and electric current maybe located in strategic position where they are not rotating, easy to cool, easy to access for maintenance and easy to monitor.
  • there are other embodiments of the disclosure where there are one or two primary sources of magnetic field and one secondary source of magnetic field is more suitable for use in a multi-layer electric power generator.
  • the embodiments of the disclosure may be such that there is N+1 secondary source of magnetic field and N primary source of magnetic field, where N stands for number of primary sources of magnetic field.
  • N stands for number of primary sources of magnetic field.
  • Another embodiment is where there is N+1 primary source of magnetic field and N+1 secondary source of magnetic field, where N stands for number of rotors.
  • Another embodiment is where there is one primary source of magnetic field sandwiched between two secondary sources of magnetic field, where the embodiment can have N primary sources of magnetic and N+1 sources of secondary magnetic field, all the above permutations are possible if and only if the N number of primary sources of magnetic field is one or more. Because of the presence of the secondary source of the magnetic field, the stator may have windings on both the two surfaces facing the sources of the magnetic field.
  • a four pole machine may generate more magnetic field in the secondary magnetic field sources than a two pole machine, an eight pole machine will do better compared to a six pole or four pole machine. For this reason, one of the embodiments of this disclosure is to have a better pole coverage or have as many poles as possible on the primary source of the magnetic field.
  • the other embodiment of this disclosure is whereby the central shaft has one active polarity electromagnet and the rotor is made of sintered magnetite mixed with resin all around and electronic switching is used to change polarities in order to generate a sinusoidal waveform.
  • the other embodiment is that the same central shaft as explained above has another polarity which may link with the return path to activate the sintered magnetite on the return path.
  • the return path may be made entirely of the sintered magnetite.
  • the stator where windings are located may be made wholly of sintered magnetite mixed with resin.
  • the magnetite material may also be put on the inside /outside surface of the return path facing the rotating pole of the rotor.
  • the embodiment is such that the when the North pole of primary source magnetic field faces a portion of the magnetite material on the inside surface of the return path, that specific portion of the return path complies and becomes a South pole.
  • the primary source may rotate while the secondary source maybe stationary and also the primary source may be stationary and the secondary source may rotate.
  • the magnetite mixed with resin can be used instead of a steel on the return path.
  • the magnetic flux on the steel is so much higher and when the same activity is done with magnetite the magnetite performs poorly.
  • Magnetite comparatively performs better on radial dispersion of magnetic field and the steel does better on lateral dispersion of magnetic field. Therefore, magnetite may be used instead of steel where radial dispersion of magnetic flux is needed as in return path, magnet shoe.
  • Magnetite generate a smoother waveform compared to steel with a smaller airgap of magnitude of +0.25mm.
  • a standard procedure during design is to increases the airgap and at the same time this action decrease the performance of the generator, therefore the magnetite gives a better waveform and better performance.
  • the thinner the magnetite element the better it performs with radial dispersion of the magnetic field which saves material and weight .
  • the magnetite at the same time gives a suitable thermal property for this application of releasing the heat very slow and gives a better opportunity to effect cooling with a smaller airgap.
  • Magnetite as a secondary source of magnetic field can also be utilised for the different parts and operations of an electric motor. Magnetite material when it is finely ground and mixed with resin has some very desirable properties for electric motor operation.
  • the airgap may be made smaller than 0.2 mm and in case of the operation when the material expand the two surface will self -machine for an appropriate operating airgap.
  • the self-machining may also improve the eccentricity of the electric motor.
  • the effect of the magnetic field and the effect of the electric field may be more effective than when the airgap is bigger, so for the electric motor with smaller airgap the application of fine magnetite mixed with resin is more suitable than for an electric generator with an airgap of 100 mm. Magnetite may effect better cooling than electric steel and therefore can help to cool the electric motor.
  • Magnetite material produces a smoother magnetic wave form, and, in this case, it is a solution by operationally producing a smoother torque and stable electric motor.
  • Fine magnetite has electric charges and when the magnetite material mixed with resin is linking with a magnetic field, the magnetite charges get excited by the magnetic field and this generate an electric field and this electric field when it is on the surface facing the airgap improves the performance of the electric motor.
  • the magnetite mixed with resin is suitable for this application to make the stator and the rotors to achieve the overall better performance of the electric motor.
  • the electric field from the stator and the rotors made with magnetite mixed with resin will interact with each other and improve the performance of the electric motor as the two surfaces are active in generating the torque for the rotor.
  • the technical improvement brought by the fine magnetite mixed with resin and its electric field may bring with it a huge commercial success, the commercial success will come because of the following factors.
  • the electric motor may be made with one stator located between two rotors to make a three-layer electric motor; another embodiment is when the electric motor is made with one stator overlaid by a plurality of concentric rotors. Another embodiment is to have an electric motor with a stator located between two rotors and put a stator adjacent to the other rotor to generate electric power, whereby this electric machine can serve as an electric motor and as a generator at the same time.
  • FIG. 1 shows a cross-sectional view of a first embodiment of an electric power generator, in accordance with the disclosure
  • FIG. 2 shows a cross-sectional view of a second embodiment of an electric power generator, in accordance with the disclosure
  • FIG. 3 shows a three-dimensional cross-sectional view of the electric power generator of FIG. 2;
  • FIG. 4 shows a three-dimensional view of a magnetite element of the electric power generator of FIG. 2;
  • FIG. 5 shows a cross-sectional view of the magnetite element of FIG. 4
  • FIG. 6 shows a top view of the magnetite element of FIG. 4.
  • FIG. 7 shows a cross-sectional view of the electric power generator of FIG. 2 with magnetic poles and field lines.
  • FIG. 1 illustrates a cross-sectional view of a first embodiment of an electric power generator 90, in accordance with the disclosure. It will be understood that the generator 90 may include many additional components common to generators such as bearings, a support frame, controlling electrics, etc. which are not illustrated but are understood to be included if necessary/desirable.
  • FIGS 2-3 illustrate cross-sectional views of a second embodiment of an electric power generator 100, in accordance with the disclosure. Again, it will be understood that the generator 100 may include many additional components common to generators.
  • first and second embodiments 90, 100 The main difference between the first and second embodiments 90, 100 is that the first embodiment 90 has only one stator member 106 while the second embodiment 100 has two stator members 106, 1 14. Otherwise, the embodiments 90, 100 may be similar or identical.
  • the second embodiment is described in more detail below, but the description (other than features relating to the second stator member 1 14) applies equally to the first embodiment.
  • the generator 100 has a first rotor member 102 which includes a magnetic field source 104.
  • the magnetic field source 104 may be permanent magnets or magnetic windings configured as an electromagnet. Either way, the magnetic field source 104 is configured to produce a magnetic field with at least one pair of magnetic poles. In this example, the magnetic field source 104 produces two poles which are opposite in polarity and diametrically opposed to each other.
  • This first rotor member 102 in itself, may be fairly conventional.
  • the generator 100 includes a stator comprising at least one stator member and, in this embodiment, it comprises two stator members 106, 1 14, namely a first (radially outer) stator member 106 and a second (radially inner) stator member 1 14.
  • Most conventional generators have only a single stator member or layer, but multi-layer stators are not new in themselves.
  • the configuration of the stator members 106, 1 14 may be fairly conventional.
  • the first stator member 106 has a plurality of circumferentially spaced teeth 108 and each pair of adjacent teeth 108 defines therebetween a slot 1 10 for accommodating windings (not illustrated) configured to have a current induced therein by the magnetic field.
  • the second stator member 1 14 may be optional but may be useful to increase a power generating capability of the generator 100.
  • the electric power generator 100 comprises a second rotor member 1 12.
  • This second rotor member 1 12 is provided around, or radially outward of, the first stator member 106.
  • the second rotor member 1 12 comprises a magnetite material, like powdered magnetite mixed with a resin binder and formed into a desired shape.
  • the second rotor member 1 12 comprises two magnetite elements 1 12.1 , 1 12.2, each formed into an arcuate section.
  • magnetite elements 1 12.1 , 1 12.2 there are the same number of magnetite elements 1 12.1 , 1 12.2 as there are poles provided by the magnetic field source 104; there are two poles and therefore there are two magnetite elements 1 12.1 , 1 12.2.
  • Each magnetite element 1 12.1 , 1 12.2 is radially aligned with one of the poles operatively generated by the first rotor member 104.
  • the magnetite elements 1 12.1 , 1 12.2 are not inherently magnetised nor do they, in isolation, generate any magnetic field.
  • magnetite element 1 12.1 is illustrated in more detail in FIGS 4-6. There may be many practicable shapes that the magnetite element 1 12.1 could be formed into, but in this embodiment, it is arcuate in cross-sectional profile (FIG. 5) and elongate in top view (FIG. 6). It is configured to extend roughly a whole length of the rotors 106, 1 14. It may have a lip or ridge on each side to facilitate mounting within the generator 100.
  • FIG. 7 illustrates the electric power generator 100 showing simplified example magnetic poles (S-N-S-N) and magnetic field or flux shown in broken lines.
  • FIG. 7 is significant because it illustrates a key feature and advantage of the present embodiment.
  • a 2-pole magnetic field is generated by the magnets 104 of the rotor 102. This magnetic field induces a corresponding but opposite polarity in the magnetite elements 1 12.1 , 1 12.2.
  • the magnetite elements 1 12.1 , 1 12.2 thus serve to enhance and direct the magnetic field through the generator 100 and specifically through the stator member 106, 114 and their current-generating windings.
  • the magnetite elements 112.1 , 112.2 may form part of a back-iron (if present) of the electric power generator 100.
  • the magnetite elements 112.1 , 112.2 are comparatively light, as magnetite is light (in powder form) and the resin binder is significantly lighter than steel. Accordingly, while the inclusion of the magnetite elements 112.1 , 112.2 does add some mass to the generator 100, it is relatively little, and the benefit of a more focussed and directed magnetic field outweighs the additional weight.
  • the electric power generator 100 is also scalable in that additional rotor members and stator members may be provided.
  • additional rotor members and stator members may be provided.
  • two rotor members and one stator member are a minimum, but this may be expanded upon.
  • additional magnetic field sources could be provided in the additional rotor members, if desired.
  • stator body and the rotor body are made with fine magnetite mixed with resin where the magnetite increases the Electric field on the surfaces of the stator and the rotor.
  • a method of operation of an electric motor where the stator and the rotors are made with fine magnetite mixed with resin and the air-gap between the stator and the rotor is less than 0.2mm and the stator surface and the rotor surface will self- machine when the material expand for an appropriate operating air-gap. 5.
  • a method of operation of an electric motor where the stator body and the rotor body are made with fine magnetite mixed with resin where the magnetite generates a smoother torque on the rotor movement and improves the stability of the electric motor.
  • An electric motor according to clause 1 with two stators and two rotors where one stator is located between the two rotors and another stator is located adjacent to the other rotor to generate electric power.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

La présente invention concerne un concept qui comprend un moyen permettant de générer un champ magnétique secondaire à l'aide d'un matériau tel qu'un matériau comprenant de la magnétite finement broyée mélangée avec de la résine pour former un bloc ou toute forme appropriée qui est utilisée en le mettant sur le trajet de retour, l'arbre central et le rotor de magnétite. Cette magnétite destinée à être utilisée dans ce cas ne présente pas de noyau d'acier important comme dans les électroaimants et ne comporte pas de conducteurs de courant pour générer le champ. Elle peut avoir une fine couche d'acier au centre dont la fonction est de lui conférer une résistance et de générer une partie du champ magnétique et de conduire le champ magnétique. La présente invention est utile en association avec un électroaimant normal ou un aimant permanent.
PCT/IB2020/052844 2019-03-29 2020-03-26 Machine électrique dotée d'un élément de rotor comprenant de la magnétite Ceased WO2020201937A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ZA2021/05687A ZA202105687B (en) 2019-03-29 2021-08-11 An electric power machine with a rotor member comprising magnetite

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201901956 2019-03-29
ZA2019/01956 2019-03-29

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WO2020201937A1 true WO2020201937A1 (fr) 2020-10-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023007315A1 (fr) * 2021-07-26 2023-02-02 The Trustees For The Time Being Of The Kmn Fulfilment Trust Composition de carburant pour combustion

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB463783A (en) * 1935-11-19 1937-04-06 British Thomson Houston Co Ltd Improvements relating to dynamo-electric machines and rotor elements therefor
US20050006972A1 (en) * 2003-07-07 2005-01-13 Bradfield Michael D. Twin coil claw pole rotor with segmented stator winding for electrical machine
US20090322176A1 (en) * 2008-06-30 2009-12-31 Denso Corporation Synchronous motor with rotor having suitably-arranged field coil, permanent magnets, and salient-pole structure
WO2011108737A1 (fr) * 2010-03-03 2011-09-09 Nidec Corporation Rotor, procédé de fabrication de rotor et moteur
US20140021820A1 (en) * 2011-03-31 2014-01-23 Daikin Industries, Ltd. Rotor and rotary electric machine using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB463783A (en) * 1935-11-19 1937-04-06 British Thomson Houston Co Ltd Improvements relating to dynamo-electric machines and rotor elements therefor
US20050006972A1 (en) * 2003-07-07 2005-01-13 Bradfield Michael D. Twin coil claw pole rotor with segmented stator winding for electrical machine
US20090322176A1 (en) * 2008-06-30 2009-12-31 Denso Corporation Synchronous motor with rotor having suitably-arranged field coil, permanent magnets, and salient-pole structure
WO2011108737A1 (fr) * 2010-03-03 2011-09-09 Nidec Corporation Rotor, procédé de fabrication de rotor et moteur
US20140021820A1 (en) * 2011-03-31 2014-01-23 Daikin Industries, Ltd. Rotor and rotary electric machine using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023007315A1 (fr) * 2021-07-26 2023-02-02 The Trustees For The Time Being Of The Kmn Fulfilment Trust Composition de carburant pour combustion

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