WO2003003546A1 - Machine electrique a aimant permanent - Google Patents

Machine electrique a aimant permanent Download PDF

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Publication number
WO2003003546A1
WO2003003546A1 PCT/GB2002/003015 GB0203015W WO03003546A1 WO 2003003546 A1 WO2003003546 A1 WO 2003003546A1 GB 0203015 W GB0203015 W GB 0203015W WO 03003546 A1 WO03003546 A1 WO 03003546A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
rotor
electrical machine
machine according
magnets
Prior art date
Application number
PCT/GB2002/003015
Other languages
English (en)
Inventor
Lawrence Haydock
Neil Lovell Brown
Original Assignee
Newage International 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
Priority claimed from GB0115857A external-priority patent/GB0115857D0/en
Priority claimed from PCT/GB2001/003323 external-priority patent/WO2002009260A1/fr
Priority claimed from GB0207127A external-priority patent/GB0207127D0/en
Application filed by Newage International Limited filed Critical Newage International Limited
Priority to GB0401751A priority Critical patent/GB2395370B/en
Publication of WO2003003546A1 publication Critical patent/WO2003003546A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02—Details
    • H02K21/04—Windings on magnets for additional excitation ; Windings and magnets for additional excitation
    • H02K21/046—Windings on magnets for additional excitation ; Windings and magnets for additional excitation with rotating permanent magnets and stationary field winding
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/48—Generators with two or more outputs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/12—Transversal flux machines

Definitions

  • This invention relates to permanent magnet electrical machines. More particularly, although not exclusively, this invention relates to axial flux AC machines.
  • AC alternators, motors or generators have a similar topology in that they include a wire-wound rotor which is journalled to rotate coaxially within a generally tubular cylindrical stator which has windings which run axially from end to end of the stator in semi closed slots which are formed at circumferentially-spaced locations in the inner cylindrical surface of the stator.
  • the bodies of the rotor and the stator are formed of ferrous material and that material is usually laminated to reduce the influence of eddy currents.
  • These machines may be provided with brushes for enabling connection to an external facility or they may be brushless. Either way these machines are an assembly of a large number of individual parts or components and they are bulky so that they occupy a large volumetric space when they are installed.
  • Alternative topologies for AC machines have been proposed. These include axial flux machines such as are described in a paper by Wu et al entitled "Design of Slotless Torus Generators with Reduced Voltage
  • This paper discloses a permanent magnet AC generator which includes a toriodial stator sandwiched between a pair of coaxial rotor discs.
  • the rotor discs are rotatably mounted upon a common axle so as to rotate together relative to the stator.
  • Each rotor disc includes a plurality of permanent magnets mounted thereon in a respective circular array.
  • the stator which is ferrous, has a stator winding wound helically therearound, ends of the winding corresponding to output terminals of the generator.
  • the arrangement is such that the permanent magnets set up an excitation magnet field which passes through the winding and through the stator. Rotation of the rotor discs and hence the excitation field relative to the stator and winding causes an electromagnetic force (emf) to be induced in the winding, such that a current may be drawn therefrom.
  • emf electromagnetic force
  • An object of this invention is to provide a machine topology which will result in an electrical machine having an overall volume which is somewhat smaller than that of the most commonly used equivalent AC machines referred to hereinbefore and which is an assembly of a somewhat smaller number of individual parts or components than the most commonly used AC machines referred to hereinbefore, are with a consequent beneficial reduction in costs.
  • a permanent magnet electrical machine having a movable part and a stationary part with field windings thereon, the movable part including one series of permanent magnets arranged in a line on one side of the stationary part and another series of permanent magnets arranged in a line on the other side of the stationary part, wherein the permanent magnets of said one series are offset with respect to the permanent magnets of said other series and are of a polarity opposite to that of the permanent magnets of said other series such that an excitation field is established, the flux of the excitation field cutting the field windings on the stationary part in alternate directions which extend generally in the direction of said lines at different locations on the stationary part.
  • a disadvantage of known permanent magnet electrical machines is that permanent magnets are expensive. This is due to a number of factors. Firstly, the rare-earth material used to make such magnets (for example, Neodymium- Iron-Boron) is expensive. Secondly, forming such material into the required shape is not straight forward. Thirdly, the formed material is brittle and must be handled carefully, particularly once magnetised.
  • US-A-6057622 discloses a permanent magnet AC machine in which a rotor disc is mounted for rotation between a stator structure on either side of it. The rotor which provides the excitation field has pole pieces of permanent magnet material alternated with pole pieces of a non-magnetised ferromagnetic material. This machine is a form of an axial flux machine.
  • US-A-5,955,809 discloses several forms of axial flux machine including one which has two rotor discs mounted for rotation, one on either side of a stator which carries field windings.
  • Each rotor disc has a circular array of permanent magnets, the magnets of each circular array being alternated with pole pieces of a non- magnetised ferromagnetic material. All the permanent magnets are similarly magnetised.
  • a subsidiary object of this invention is to enable an electrical machine which embodies this invention to be constructed using a smaller amount of permanent magnet material than might otherwise be the case.
  • the permanent magnets of each said series alternate along the respective line with pole pieces of non-magnetised ferromagnetic material such that a respective substantially closed loop of magnetic flux can be established through each juxtaposed magnet and non-magnetised pole piece pair so as to form a control field.
  • each of the non-magnetised pole pieces is positioned substantially opposite a permanent magnet on the opposite side of the stationary part.
  • the permanent magnet electrical machine may be a rotary or linear AC alternator, motor or generator.
  • the movable part would be a rotor and the stationary part a stator with the winding wound thereon.
  • the rotary AC machine is an axial flux machine wherein flux of the excitation field travels between the rotor and the stator in a substantially axial direction.
  • the rotor includes an axle and two rotor discs which are mounted on the axle spaced apart one from another, the rotor being rotatable relative to the stator about an axis and the stator being sandwiched between the two rotor discs.
  • the preferred form of stator is annular and it surrounds the axle with which it is substantially coaxial.
  • the stator winding is located in slots formed in a surface of the stator adjacent the respective one of the rotor discs.
  • Each of the two series of permanent magnets of this rotary axial flux machine may be mounted in a circular array of substantially constant pitch on a face of a respective one of the rotor discs which is adjacent to the stator.
  • Wu et al acknowledged the problematic nature of a phenomenon known as "armature reaction” whereby should a load be connected across the output terminals of the stator winding so as to draw a current therefrom, the existence of this current in the winding results in a field being set up around that winding. This field is referred to as the "armature reaction field”. Its orientation depends on the power factor of the loads. For common resistive and inductive loads, or a combination thereof, the effect is to react against and oppose the action of the excitation field so as to effectively reduce the strength thereof.
  • the permanent magnet machine disclosed in US-A-6057622 includes field weakening coils to produce flux in the stator structure on either side of the rotor disc including a flux which counters flux normally produced in the air gaps between the rotor which carries the permanent magnet poles and the stator structure on either side of it.
  • control means are provided which are operable to set up a control field through the moving part, the cores of said one series and the stationary part, said control field enhancing or opposing said excitation field.
  • the control means are stationary and may comprise the control windings.
  • Such a control winding may extend around material of the moving part.
  • a subsidiary object of this invention is to encourage as much of the flux established by the permanent magnets included in the rotor disc as possible to pass directly into the stator through the intervening air gaps rather than by being passed through the axle.
  • additional permanent magnets are mounted in each rotor disc, each additional permanent magnet being adjacent a respective one of said pole pieces of non-magnetised ferromagnetic material of the respective series the magnetisation of each of the additional magnets being opposite to that of the permanent magnets of the respective series that are mounted on the same rotor disc either side of the adjacent pole pieces of non-magnetised material.
  • the additional permanent magnets may be smaller than the permanent magnets of said one and said other series.
  • the additional magnets and the permanent magnets of said one and said other series are made from the same magnetic material in which case the combined area of each additional magnet and the adjacent pole piece of non-magnetised ferromagnetic material with which it is side by side may be about the same as that of each of the permanent magnets of said one and said other series.
  • Figure 1 is an exploded perspective view of the AC alternator
  • Figure 2 is a sectional view of the alternator, the section being taken on a diametrical plane through the axis of rotation of a rotor of the alternator;
  • Figure 3 is schematic plan view of the alternator.
  • Figure 4 is a perspective view of a modified form of rotor for the AC alternator shown in Figures 1 to 3.
  • Figure 1 shows the alternator has a rotor 10 and an annular stator core 11 which has a central aperture 15.
  • the rotor 10 is formed of two similar rotor discs 12 and 13 which are mounted coaxially, one at either end of an axle 14.
  • the axle 14 extends through the central aperture 15 of the annular stator core 11 so that the annular stator 11 is between the two rotor discs 12 and 13.
  • the stator core 11 is formed by rolling up a strip of ferrous metal.
  • the strip has notches punched in its edges at appropriately indexed intervals before it is rolled up. The intervals are selected so that the notch is aligned with rows of other such notches when the strip is rolled up so that the resultant annular body has radially extending slots 16 formed by the rows of aligned notches in each of its radially extending side faces 18 and 19.
  • the slots 16 receive stator windings 17 which are toroi dally wound around the annular stator core 11.
  • stator windings 17 are led along a slot 16, across the outer periphery of the annular stator core 11, along a respective slot 16 on the other side of the stator core 11 and back through the central aperture 15 of the annular stator core 11.
  • the stator windings 17 are connected to the output terminals of the alternator whereby an emf induced in the stator windings is supplied to an external load as is usual.
  • Each rotor disc 12, 13 is a disc-shaped plate of ferrous material.
  • Figure 2 shows that there is an air gap 28, 29 formed between each radially extending annular side face 18, 19 of the annular stator core 11 and the adjacent face of the adjacent one of the two rotor discs 12 and 13.
  • the rotor 10 is mounted coaxially with the annular stator core 11 for rotation relative thereto.
  • a circular array of permanent magnets 21 and 22 are mounted on the radially extending circular face of each disc 12, 13 that faces the adjacent face 18, 19 of the annular stator core 11.
  • the magnets 21 and 22 are fabricated from a rare-earth material such as Neodymium-Iron-Boron.
  • the magnets 21 and 22 are segment shaped and are positioned on the respective rotor disc 12, 13 adjacent the periphery thereof and so that the circular array of magnets 21, 22 on each rotor disc 12, 13 is coaxial therewith.
  • two magnets 21 and 22 are provided on each rotor disc 12 and 13.
  • any number of magnets may be provided.
  • the two magnets 21 are positioned diametrically opposite one another with north-seeking faces adjacent the face 23 of the rotor disc 12 that is adjacent the annular stator core 11.
  • the cores 24 are of a material of high permeability, such as soft iron.
  • the cores 24 may be of the same size and shape as the magnets 21 and are positioned diametrically opposite one another and so as to be adjacent the periphery of the rotor disc 12 and coaxial therewith.
  • Each core 24 is positioned circumferentially between the two magnets 21 so that, together, the two magnets 21 and the two cores 24 are arranged in a circular array with a constant annular pitch of 90 degrees.
  • the cores 24 are integrally formed with the rotor disc 12, although the cores 24 may not be integral with the rotor disc 12 and may be attached thereto. Any number of cores 24 may be provided, but it is preferred that there be an equal number of cores 24 and magnets 21 and that these are positioned alternately around the circumference of the rotor disc 12.
  • the rotor disc 13 also includes two magnets 22 and two cores 25 on the surface 26 thereof that is nearer to the annular stator core 11 and may be considered a mirror image of the first rotor disc 12.
  • the arrangement of magnets 22 and cores 25 on the rotor disc 13 is rotationally displaced from that of the rotor disc 12 by the amount of the pitch angle, ie by 90 degrees. This has the effect of positioning the magnets 21 of the rotor disc 12 opposite the cores 25 of the rotor disc 13.
  • the magnets 22 on the rotor disc 13 are positioned with the north-seeking faces furthermost from the rotor disc 13.
  • FIG 2 shows the stator windings 17 on the annular stator core 11.
  • the stator core 11 carries a control winding 27.
  • the control winding 27 is shown schematically as a single conductor for the sake of clarity.
  • the control winding 27 is annular and is positioned radially inside the stator core 11, around the periphery of the hole 15 therethrough so as to encircle the axle 14 that connects the two rotor discs 12 and 13.
  • the control winding 26 is fixably located relative to the stator core 11.
  • FIG. 3 is a schematic representation of the alternator 10, converted into linear form for clarity.
  • the stator winding 17 of the stator 11 may be seen positioned within the slots 16 of the stator core 11. This enables the air gap 28 between the rotor disc 12 and ferrous material of the stator core 11 and the air gap 29 between the rotor disc 13 and ferrous material of the stator core 11 to be minimised.
  • the permanent magnets 21 and 22 set up an excitation magnetic field 31.
  • the north-seeking faces of the magnets 22 of the rotor disc 13 are positioned adjacent the stator core 11. Flux of the excitation magnetic field 31 passes from each magnet 21 of the rotor disc 12, across the air gap 28 and into the stator core 11, circumferentially through the stator core 11 in both directions, out of the stator core 11 and across the air gap 29, into the respective south-seeking face of each of the respective two adjacent magnets 22 on the rotor disc 13.
  • the flux path continues through the rotor disc 13, through the ferrous axle 14, through the rotor disc 12 and back into the magnets 21 mounted thereon, thereby forming a closed loop.
  • Rotation of the rotor discs 12 and 13 causes the excitation field 31 to rotate, subjecting the stator winding 17 to a change in magnetic field. This results in an emf being induced in the winding 17, such that a current may be drawn therefrom by a load (not shown) connected thereto.
  • a reaction field (not shown) is set up around that winding 17.
  • the direction of the reaction field may be such that it tends to oppose the excitation field 31 in the stator core 11 and therefore tends to reduce the size of the emf induced in the winding 17.
  • Flux of the reaction field in following a path of least reluctance, passes from the cores 24 of the rotor disc 12, across the air gap 28 and into the stator core 11, circumferentially through the stator core 11 in both directions so as to oppose the excitation magnetic field 31, out of the stator core 11 and across the air gap 29, into the cores 25 of the rotor disc 13.
  • the flux path of the reaction field is completed through the rotor disc 13, the axle 14 and the rotor disc 12 so as to form a closed loop.
  • the reaction field opposes the excitation field 31 in the stator core 11, but enhances the excitation field in the rotor discs 12 and 13 and in the axle 14. Both of these characteristics are undesirable.
  • the former results in variation in the output voltage of the alternator 10 with variations in the current drawn therefrom.
  • the latter requires the axle 14 to be of a large cross-sectional area.
  • control winding 27 would have a potential difference connected across it so as to cause a current to flow therein. This would result in a control field 32 being set up around the control winding 27.
  • Figure 2 shows the direction of the control field 32 in a radial plane. The flux of this field 32 passes through the axle 14 into the rotor disc 13, across the air gap 29, into and through the stator core 11, across the air gap 28, into the rotor disc 12 and back into the axle 14.
  • the direction of the control field 32 in the rotor disc 12, the rotor disc 13 and the axle 14 is such that it serves to oppose both the excitation field 31 and the reaction field.
  • the net flux in the axle 14 may be negligible. This is advantageous in removing the requirement for an axle 14 of large cross-sectional area.
  • Figure 3 shows how the control field 32 may interact with the excitation field 31. Flux tends to follow a path of least reluctance. The flux of the control field 32 therefore passes along the rotor disc 13 into the ferrous cores 25 rather than into the permanent magnets 22, the cores 25 being of greater permeability. The flux of the control field 32 passes through the cores 25 and then passes the air gap 29 into the stator core 11. It passes circumferentially through the stator core 11 in the same directions as does the flux of the excitation field 31, thereby enhancing the excitation field 31. The flux of control field 32 then passes out of the stator core 11 and across the air gap 28 into the cores 24 of the rotor disc 12.
  • the flux of the control field 32 tends to pass into the cores 24, rather than the permanent magnets 21 of the rotor disc 12 in accordance with its tendency to follow the path of least reluctance.
  • the flux path of the control field 32 is then closed .via the rotor disc 12 and the axle 14 as described above with reference to Figure 2.
  • the path of the control field 32 is therefore the same as the path of the reaction field but the respective directions are such that the control field 32 serves to oppose the reaction field.
  • the minimisation of the air gaps 28 and 29 is advantageous in reducing the reluctance thereof and encouraging the flux of the control field 32 (as well as that of the excitation field 31) to pass thereacross.
  • the ferrous axle 14 that connects each of the rotor discs 12 and 13, and the rotor discs 12 and 13 themselves provide a path of low reluctance for flux of the control field 32 to follow. It would be appreciated the north-seeking pole pieces of the rotor disc 12 are opposite north-seeking pole pieces of the rotor disc 13, and that south- seeking pole pieces of the rotor disc 12 are opposite south-seeking pole pieces of the rotor disc 13.
  • each core 24 of the rotor disc 12 is further advantageous to arrange each core 24 of the rotor disc 12 opposite a respective one of the magnets 22 of the rotor disc 13, rather than opposite a respective one of the cores 25 thereof.
  • This offsetting of the respective cores 24 and 25 of each rotor disc 12 and 13 results in the cores 24 of the rotor disc 12 being of a different polarity to the cores 25 of the rotor disc 13 (it already having been stated that opposite poles of a like polarity are desired).
  • This provides paths of low reluctance along which flux of the control field 32 may pass.
  • These low-reluctance paths are from the cores 25 of the rotor disc 13 to the cores 24 of the rotor disc 12 circumferentially through the stator core 11 and in a direction such that flux of the control field 32 that passes therealong enhances the excitation field 31.
  • an automatic voltage regulator (AVR) be employed to sense the size of the output voltage across the stator windings 17 and to vary the current in the control winding 27 accordingly, thereby maintaining the emf induced in the stator winding 17, and hence the voltage across the output thereof, at a near constant level, irrespective of load current.
  • AVR automatic voltage regulator
  • FIG 4 shows a modified form of rotor disc 33 for use in place of each of the rotor discs 12 and 13 described above with reference to Figures 1 to 3.
  • the modification is that each of the ferrous cores 24 and 25 of the rotor discs 12 and 13 is replaced by a respective arcuate ferrous core 34, which approximates in size and location on the rotor disc 33 to the radially inner half of the respective ferrous core 24, 25, and to a respective arcuate permanent magnet 35 which approximates in size and location on the rotor disc 33 to the radially outer half of the respective ferrous core 24, 25.
  • the polarisation of the arcuate permanent magnet 35 would be opposite to that of the other two permanent magnets 21, 22 of the respective rotor disc 12, 13 that the rotor disc 33 is to replace.
  • the arcuate ferrous cores 34 and the arcuate permanent magnets 35 are mounted on the innermost face of the rotor disc 33 with a narrow arcuate air gap 36 formed between their respective radially outer and radially inner edges which are both arcuate.
  • the ferrous pole pieces 34 are large enough to accommodate the level of flux generated by energisation of the control winding 27 when a load is connected across the stator winding 17 as well as the level of flux that can be set up therein by the magnets 21, 22 and 35.
  • the flux density in the ferrous core 34 is relatively low, even when a load is connected to the stator winding 17 during operation of the alternator 10 so that the level of flux contribution from energisation of the control winding 27 is not impeded by the use of the smaller ferrous pole pieces 34.
  • the "hybrid" pole which comprises an arcuate ferrous core 34 and an arcuate permanent magnet 35 is a means for increasing the no load stator flux linkage of the alternator without compromising the amount of flux available from the control winding 27 required to counter the effects of armature reaction. Use of the "hybrid” pole would therefore improve the power density of the alternator as compared with that of the alternator 10 described with reference to Figures 1 to 3.
  • the narrow arcuate air gap 36 is left between the arcuate ferrous core 34 and the arcuate permanent magnet 35 to reduce leakage fields.
  • Other juxtapositions of permanent magnet material and ferrous material in an arrangement for use as such a hybrid core are possible.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Synchronous Machinery (AREA)

Abstract

Une machine à c.a. à flux axial possède un rotor (10) et un stator annulaire (11). Le rotor (10) comporte deux disques (12 et 13) montés sur un arbre rotor commun (14), de chaque côté du stator (11) portant les enroulements de champ. Chaque disque (12, 13) de rotor possède deux aimants permanents (21, 22) diamétralement opposés l'un à l'autre sur sa face (23, 26) adjacente au stator (11), et deux pièces polaires (24, 25) en matière ferromagnétique non magnétisée, diamétralement opposées l'une à l'autre sur la même face (23, 26) du disque (12, 13) de rotor. Chaque pièce polaire (24, 25) se situe entre les deux aimants (21, 22), sur la même face (23, 26). Chaque aimant (21, 22) est aligné axialement avec une des pièces polaires respective (24, 25) sur l'autre disque (12, 13) de rotor, de sorte que les aimants (21, 22) sur un disque (12, 13) de rotor soient décalés par rapport aux aimants (21, 22) sur l'autre disque (12, 13) de rotor. La polarité des aimants (21, 22) sur chaque disque (12, 13) de rotor est opposée à celle des aimants (21, 22) sur l'autre disque (12, 13) de rotor. Ainsi, le flux du champ d'excitation établi par les aimants (21 et 22) coupe les enroulements sur le stator (11) dans des sens circonférentiels alternés à différents endroits autour du stator (15). Un enroulement de commande est porté par le stator (11) dans son ouverture centrale (15) et peut être excité, de manière que soit créé un champ de commande créant une boucle fermée de flux magnétique à travers chaque aimant juxtaposé (21, 22) et pièce polaire non magnétisée (24, 25), et s'oppose à la réaction de l'induit.
PCT/GB2002/003015 2001-06-28 2002-06-28 Machine electrique a aimant permanent WO2003003546A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0401751A GB2395370B (en) 2001-06-28 2002-06-28 A permanent magnet electrical machine

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GB0115857.5 2001-06-28
GB0115857A GB0115857D0 (en) 2001-06-28 2001-06-28 A permanent magnet electrical machine
PCT/GB2001/003323 WO2002009260A1 (fr) 2000-07-24 2001-07-24 Machine a courant alternatif a aimant permanent
GBPCT/GB01/03323 2001-07-24
GB0207127.2 2002-03-26
GB0207127A GB0207127D0 (en) 2002-03-26 2002-03-26 A permanent magnet AC machine

Publications (1)

Publication Number Publication Date
WO2003003546A1 true WO2003003546A1 (fr) 2003-01-09

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Family Applications (1)

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PCT/GB2002/003015 WO2003003546A1 (fr) 2001-06-28 2002-06-28 Machine electrique a aimant permanent

Country Status (2)

Country Link
GB (1) GB2395370B (fr)
WO (1) WO2003003546A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6975044B2 (en) * 2002-12-20 2005-12-13 Isao Takahashi Generator
EP1716627A1 (fr) * 2004-02-17 2006-11-02 Tri-Seven Research, Inc. Moteur a rotor a inducteur unique
CN100365921C (zh) * 2003-12-17 2008-01-30 上海大学 可控磁场永磁盘式电机
WO2008098403A3 (fr) * 2007-02-15 2008-10-02 Gloor Engineering Machine électrique
WO2010007385A3 (fr) * 2008-07-16 2010-04-29 Cummins Generator Technologies Limited Machine à flux axial
WO2009156297A3 (fr) * 2008-06-24 2010-07-22 Schaeffler Technologies Gmbh & Co. Kg Mécanisme de commande linéaire, en particulier pour le réglage de clapets dans des turbocompresseurs de véhicules à moteur
US7939983B2 (en) 2006-09-14 2011-05-10 Norimasa Okamoto Generator having first and second windings with same-direction electromotive forces
US8040011B2 (en) 2006-03-16 2011-10-18 The University Court Of The University Of Edinburgh Generator and magnetic flux conducting unit
EP1976102A3 (fr) * 2007-03-26 2014-12-10 Robert Bosch Gmbh Machine électrique homopolaire
JP2015019546A (ja) * 2013-07-12 2015-01-29 株式会社東芝 アキシャルギャップ型永久磁石回転電機およびその製造方法
EP2553792A4 (fr) * 2010-03-30 2017-11-01 Volvo Technology Corporation Rotor de machine électrique comportant des aimants permanents incorporés et machine électrique correspondante

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Publication number Priority date Publication date Assignee Title
US4237396A (en) * 1977-10-06 1980-12-02 P A Management Consultants Limited Electromagnetic machines with permanent magnet excitation
US5245238A (en) * 1991-04-30 1993-09-14 Sundstrand Corporation Axial gap dual permanent magnet generator
US6175178B1 (en) * 1999-10-21 2001-01-16 Christopher N. Tupper Low inductance electrical machine for flywheel energy storage

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US4237396A (en) * 1977-10-06 1980-12-02 P A Management Consultants Limited Electromagnetic machines with permanent magnet excitation
US5245238A (en) * 1991-04-30 1993-09-14 Sundstrand Corporation Axial gap dual permanent magnet generator
US6175178B1 (en) * 1999-10-21 2001-01-16 Christopher N. Tupper Low inductance electrical machine for flywheel energy storage

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Title
CARICCHI F ET AL: "COMPACT WHEEL DIRECT DRIVE FOR EVS", IEEE INDUSTRY APPLICATIONS MAGAZINE, IEEE CENTER, US, vol. 2, no. 6, 1 November 1996 (1996-11-01), pages 25 - 32, XP000682020, ISSN: 1077-2618 *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6975044B2 (en) * 2002-12-20 2005-12-13 Isao Takahashi Generator
CN100365921C (zh) * 2003-12-17 2008-01-30 上海大学 可控磁场永磁盘式电机
EP1716627A1 (fr) * 2004-02-17 2006-11-02 Tri-Seven Research, Inc. Moteur a rotor a inducteur unique
EP1716627A4 (fr) * 2004-02-17 2007-03-28 Tri Seven Res Inc Moteur a rotor a inducteur unique
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