WO1994007295A1 - Machine dynamoelectrique et stators destines a celle-ci - Google Patents

Machine dynamoelectrique et stators destines a celle-ci Download PDF

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Publication number
WO1994007295A1
WO1994007295A1 PCT/NZ1993/000084 NZ9300084W WO9407295A1 WO 1994007295 A1 WO1994007295 A1 WO 1994007295A1 NZ 9300084 W NZ9300084 W NZ 9300084W WO 9407295 A1 WO9407295 A1 WO 9407295A1
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WO
WIPO (PCT)
Prior art keywords
stator
strip
rotor
poles
wound
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/NZ1993/000084
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English (en)
Inventor
Peter Bruce Clark
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.)
Cadac Holdings Ltd
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Cadac Holdings Ltd
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 Cadac Holdings Ltd filed Critical Cadac Holdings Ltd
Priority to AU49871/93A priority Critical patent/AU4987193A/en
Publication of WO1994007295A1 publication Critical patent/WO1994007295A1/fr
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
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/26—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors consisting of printed conductors
    • 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

Definitions

  • This invention relates to dynamoelectric machines, and has particular application to brushless DC electric motors.
  • both the rotor and stator include a number of iron or steel laminations, stamped into relatively complex shapes, in order to increase the interaction of magnetic flux of either permanent-magnet or electromagnetic origin with the magnetic fields generated by electric currents flowing in the windings of the motor.
  • Disadvantages associated with such laminations include mass, weight, expense, complexity, and evolved heat caused by eddy currents or hysteretic losses within the mass of ferrous material.
  • motors of the "Universal AC DC" type as are commonly used in vacuum cleaners and the like cannot run for extended periods because of the rise in temperature within the laminations.
  • the present invention is an improvement over the dynamoelectric machine stators described in PCT/GB91/00155.
  • the invention provides a stator for a dynamoelectric machine of any configuration wherein said stator comprises a substrate, and one or more layers of elongate yet flattened ferromagnetic material are provided on or close to the surface of the substrate, with wound poles superimposed on said layer(s) of elongate material, wherein said ferromagnetic material is comprised of a "soft magnetic" material having a magnetic permeability greater than 20.
  • the dynamoelectric machine has a substantially cylindrical rotor and a substantially cylindrical stator.
  • the one or more layers of ferromagnetic material exhibits low hysteresis and low eddy current losses.
  • the stator has a substrate of substantially nonconducting, substantially nonmagnetic material, and said one or more layers of ferromagnetic material of high magnetic permeability are positioned on or close to the surface of the substrate.
  • stator substrate could be formed from a steel pressing or other metallic material.
  • the ferromagnetic material is provided in the form of a tape or strip of indefinite length having a cross sectioned shape wherein the thickness is substantially less than the width.
  • each layer of ferromagnetic material within the assembled stator is comprised of a single turn of said material, and multiple layers of said material are preferably built up by wrapping each layer over the preceding layer, in the manner of a clock spring, or a roll of adhesive tape.
  • the material has electrically insulating layer(s) on one or both main surfaces to minimise conduction across superimposed layers.
  • the ferromagnetic material consists of a single coil of tape or strip but it will be appreciated that the coil would be made up of several strips wound one on another.
  • the ferromagnetic strip or tape is generally referred to herein as a "coiled strip".
  • the ferromagnetic material is preferably formed from a "soft magnetic” material such as an annealed steel strip of suitably thin dimensions wound on said substrate. Any “soft magnetic” material may be used, but we have found that annealed low carbon steel is inexpensive and is readily available. A silicon steel is also preferable.
  • a "soft magnetic” material is one that can be easily magnetised and which has a hysteresis (b/H) loop including a minimal area. The term “soft” refers to the magnetic property of the material and not its mechanical property. The preferred "soft magnetic” materials have a large saturation magnetisation.
  • multiple layers of coiled strip are used in applications wherein the magnetic flux is liable to saturate a lesser number of layers.
  • the invention is particularly suited to brushless DC motors, although it can be used with any dynamoelectric machines of any configuration including cylindrical motors and alternators, pancake motors and alternators, commutator motors, and linear motors.
  • the stator may be an internal or external cylindrical stator, although for larger machines we prefer to use an internal stator and an external rotor.
  • the invention provides a stator for a cylindrical dynamoelectric machine wherein said stator includes a generally cylindrical support having one or more layers of coiled strip formed from a soft magnetic material on said support, and wound poles superimposed on said layer(s) of coiled strip.
  • the invention provides a stator for a cylindrical dynamoelectric machine, comprising a generally cylindrical stator having an outer stator surface wherein said stator has a generally cylindrical substrate of a first material having outer flanges defining a shallow circumferential recess and a thin annular substantially cylindrical layer in said recess, said annular layer having an outer annular surface, a plurality of wound poles superimposed on said outer annular surface, and characterised in that said thin annular substantially cylindrical layer is formed from one or more lengths of strip of width comparable to the width of the recess, and said strip comprises a soft magnetic material having a magnetic permeability greater than 20.
  • the invention provides a rotary dynamoelectric machine comprising: a generally cylindrical stator having a stator surface, a generally cylindrical external rotor rotatable about a rotational axis and having an interior generally cylindrical rotor surface surrounding said stator and spaced apart therefrom by a generally cylindrical gap, a plurality of magnetic poles on said interior generally cylindrical rotor surface and positioned adjacent said generally cylindrical gap, wherein said stator has a generally cylindrical substrate of a first material having outer flanges defining a shallow circumferential recess and a thin annular cylindrical layer in said recess, said annular layer having an outer annular surface, a plurality of wound poles superimposed on said outer annular surface, so that the wound poles are adjacent said cylindrical gap and face said rotor and at least a majority of the wound poles are positioned substantially parallel to the rotational axis of the rotor, and characterised in that said thin annular cylindrical layer is formed from one or more lengths of strip of width comparable to the width of
  • the invention provides a dynamoelectric machine having a generally cylindrical stator comprising a generally cylindrical substrate of substantially nonconducting, substantially nonmagnetic material, having one or more layers of coiled strip formed from a soft magnetic material on said substrate, with wound poles superimposed on said layer(s) of coiled strip and surrounded by an external substantially cylindrical rotor having a plurality of permanent magnetic poles on the inner cylindrical surface of said rotor.
  • the invention provides a brushless DC electric motor comprising a generally cylindrical rotor having a plurality of permanent magnetic poles associated therewith; and a stator having a generally cylindrical substrate having one or more layers of coiled strip formed from a soft magnetic material on said substrate, and wound poles superimposed on said layer of coiled strip and facing towards said rotor.
  • the invention may be utilised with machines having a low number of poles, e.g. 2 or 4 pole machines, however the invention is most advantageous where medium or high pole numbers are used and more preferably where the permanent magnetic poles are closely spaced around the periphery of the rotor.
  • the layer(s) of soft magnetic coiled strip can be relatively thin (in the range of 1 to 4mm) and thus a smaller amount of steel coiled strip is used than for a 2 pole machine.
  • the exact number of poles will depend on the rotor size but for most applications we prefer to manufacture machines with 6 to 20 poles.
  • the magnetic layer or layers of coiled strip formed on the stator consists of coiled strip (such as steel coiled strip wound in one or more overlaid layers.
  • the layer or layers may be formed of discrete and preferably tightly apposed loops of steel strip of soft magnetic properties placed on the cylindrical stator.
  • a magnetic depth of about 4 to 5mm deep may be made from multiple layers of coiled strip of preferably 0.2mm - a kind of "shim" to about 1mm in thickness.
  • the width of the strip is preferably 48 mm and the thickness is 0.5 mm, and eleven layers of the strip are used.
  • the coiled strip is used with its oxide coating intact, to serve as insulation, though optionally further layers of insulating material may be applied between the turns of the coiled strip.
  • the surface of the coiled strip is of low conductivity (and an annealed steel coiled strip has relatively low surface conductivity) or the coiled strip may be coated with an insulating layer such as varnish, or a thin insulating sheath (such as a synthetic plastics material), or wrapped together with an adjacent layer of paper or other insulating sheet material.
  • an insulating layer such as varnish, or a thin insulating sheath (such as a synthetic plastics material), or wrapped together with an adjacent layer of paper or other insulating sheet material.
  • Such a machine having a stator formed from one or more layers of a soft magnetic material in the form of one or more coiled strips or tapes wound on or laid on the surface of the substrate enables a machine to be made at low cost, and have low inductance.
  • Such a machine can be used with relatively low cost electronic commutation systems, so that a brushless DC motor can be produced having simple electronic controls.
  • Figure la is a drive end view (with mounting plate removed) of a permanent magnet rotary dynamo electric machine of the type used with the coiled strip showing the external rotor construction using bar magnets.
  • Figure lb is a section on line AA of Figure 1, (with mounting plate in position), showing the placement of the bar magnets in the outer rotor, and the relative position of the stator within the rotor.
  • Figure lc is an exploded perspective view of the rotor and stator of Figures la and lb showing the layers of steel coiled strip beneath the wound poles.
  • Figure Id is an expanded sectional view of the stator of Figure lb, with the depth of the four layers of steel coiled strip and the depth of the wound poles exaggerated for the purpose of identification.
  • Figure 2a shows the drive end view of a permanent magnet rotary dynamo electric machine having an external rotor formed from a one piece ring magnet. (The stator construction has been omitted from this drawing.)
  • Figure 2b is a section on line BB of Figure 2a, showing the construction of the rotor only.
  • Figure 3 shows a flux diagram for a 12 pole permanent magnet rotary dynamo electric machine of this invention.
  • Figure 4 shows a three phase winding construction for a typical permanent magnet rotary dynamo electric machine of this invention.
  • Fi g ure 5a shows the. drive end view (end cover removed) of a permanent magnet rotary dynamo electric machine showing an internal rotor construction using a cylindrical magnet.
  • Fi g ure 5b shows a section on line CC of Figure 5a, in exploded view, of the end cover, internal rotor, and external stator.
  • Figure 6 (reproduced together with Figure 3) shows an expanded view of the magnetic flux path through the steel coiled strips.
  • Figure 7 is a graph of the magnetic properties of the preferred annealed steel coiled strip.
  • Figure 8a shows an end view of a stator and rotor for a 6 pole permanent magnet rotary dynamo electric machine using 12 bar magnets in pairs.
  • Figure 8b shows a voltage graph for a typical permanent magnet rotary dynamo electric machine of this invention.
  • the motor/alternator of this invention is preferably constructed using a series of adjacent bar magnets inside a steel annulus to form the rotor as shown in Figure la.
  • the steel annulus provides two important functions:
  • the motor alternator of this invention can also be constructed with the rotor as the inner element and the stator as the outside element, see Figures 5a and 5b, but is not as advantageous as the external rotor construction because of the lower maximum rpm that the rotor of Figure 5b can sustain without flying apart due to the low tensile strength of ceramic and rare earth magnets or adhesive attachments when compared to the steel cup shaped rotor of Figure lb.
  • the internal rotor construction does have applications in the low to middle speed area as it lends itself to current construction techniques as used to manufacture small induction motors and alternators.
  • the direct current motor employing a co-axial steel-coiled strip stator is controlled by electronic means to provide a brushless DC motor.
  • a co-axial motor or alternator having an external rotor construction utilizing bar magnets. Whether the unit is used as a motor or an alternator will depend upon the application required, and whether or not current is extracted from the stator windings, or whether current is supplied to the stator windings to operate the unit as a motor.
  • the motor/alternator 10 has a cylindrical sleeve 11 which is conveniently in the form of a cup having an end face 12, which is attached to a central shaft 13.
  • This shaft is preferably mounted within bearings 14, 15 mounted within a stator 16.
  • the shaft has a tapped end 17 for connection to other machinery.
  • the inner face 20 of the sleeve 11 is provided with a plurality of side by side bar magnets 27, aligned with their long axes parallel to the axis of the rotor and are magnetised radially (as shqwn in Figures la, lb, 3 and 8a).
  • an annular magnetic material may be magnetised so as to form a number of poles, as shown in Figures 2a and 5 a. It will be appreciated that there will be an even number of such closely spaced magnets, so that the polarity of the permanent magnetic poles alternates as one travels around the inner circumference presented by these magnets. [This differs from traditional motor designs where the magnetic poles are widely spaced and there are much longer flux paths through the steel laminations of the stator/core].
  • the magnets 27 are preferably rare earth or ceramic bar magnets, and 20 such magnets are shown in Figure la, for the purpose of illustration. Any even number of such magnets can be used depending upon design criteria such as size, weight, price, availability and frequency. For medium speed machines 6 to 30 poles are preferred, with 6-20 permanent magnetic poles providing optimum performance for a motor of the type illustrated in Figures la and lb. By closely spacing the magnets around the rotor circumference, the motor can be used with a minimal amount of steel coiled strip on the stator and can also be used with relatively low cost electronic commutation.
  • the bar magnets are formed from either rare earth or ceramic magnets, and have a high field strength enabling them to provide a higher magnetic flux across a much wider air gap than is possible with conventional magnets, but at the same time it is preferred that .the adjacent permanent magnetic poles are close together - in fact preferably in contact - to provide a short magnetic flux path between adjacent magnetic poles.
  • the rotor sleeve and end face are formed of steel although other materials could be used.
  • the rotor and stator are spaced apart by a relatively large cylindrical air gap 28 of the order of 0.25mm to 1.5mm and preferably 0.75mm for the 20 pole motor/alternator of this example.
  • the air gap is preferably less than the depth of the magnets and should be of such a size as to allow for normal engineering clearances and tolerances.
  • the stator has an annular generally cylindrical substrate 24 of low magnetic permeability material (i.e. less than 20 relative to air) covered with a plurality of layers of silicon steel coiled strip 3 of small cross section.
  • coiled strip may be say, 0.5mm in thickness and is wound in a tight spiral on the outer surface of the cylindrical stator. With such a small strip thickness a number of layers may be wound one on top of the other, and in this illustrative example (Id) four such layers are used to give a depth of magnetic material of approximately 1.5mm.
  • a plurality of wound poles 25 are provided on top of the outermost layer of steel coiled strip.
  • the wound poles would have a thickness approximately equivalent to that of the steel coiled strip layer(s).
  • the substrate of the stator is preferably formed from a synthetic plastics material such as "Tufnol” or a glass reinforced plastics as this can be formed into a sufficiently rigid cylindrical surface.
  • a synthetic plastics material such as "Tufnol” or a glass reinforced plastics as this can be formed into a sufficiently rigid cylindrical surface.
  • Tifnol is the trade mark of a plastics product containing layers of cotton fabric impregnated with phenolic resin which can be machined to form the stator.
  • the steel coiled strip and wound poles may also be covered with a similar resin so that neither the steel coiled strip or wound poles could be said to be on the surface of the stator (although they would be close to the resulting resin surface).
  • 24A and 24B refer to capped exterior surfaces on the stator.22 ( Figure lb) indicates a mounting plate for the motor.
  • the number of wound poles correspond to the number of permanent magnetic poles inside the rotor.
  • the wound poles are relatively shallow in that they are formed on or close to the surface of the substrate (unlike conventional wound poles which are wound within slots formed in steel laminations).
  • the depth of the wound poles on or close to the surface of the stator will depend upon the size of the stator and required rating of the motor. In the example shown, the depth would be of the order of 1mm to 10mm, and preferably about 3mm.
  • Figure 4 shows the wave windings Wl, W2, W3 each providing a plurality of wound poles 201 - 211, 201A - 211 A, and 201B - 21 IB on the surface of a substrate for a three phase stator winding as used in the motor/alternator of Figures la/lb.
  • a three phase winding is preferred for most applications but other phases have their uses for particular applications. They may be exposed to the air or encapsulated in a plastic resin of low magnetic permeability.
  • the wound poles may be provided in a variety of forms and may provide for one or more phases. They are shown schematically in Figures lb, lc and 4 as wave windings on a flexible substrate. However, it is preferred that in most cases the windings are lap windings having turned-over ends as shown in Figures Id and 5b.
  • the wound poles on the surface of the stator are so positioned as to intersect the magnetic flux lines connecting adjacent ceramic magnets as the flux lines essentially form a series of loops from one magnet to the next as one travels around the inner circumference of the rotor. This is shown in Figure 3a which illustrates the relative position of the wound poles 25 and the soft magnetic layer - the layers of steel coiled strip 3, and the relatively short magnetic flux paths between adjacent permanent-magnetic poles on the rotor.
  • FIG. 1 is an end view of the rotor from the open end, and Figure 2b is a section through B--B of Figure 2a.
  • This example motor has 12 closely spaced permanent magnetic poles around the periphery of an external cylindrical rotor.
  • Figure 3 shows the average magnetic flux path originating in a permanent magnet rotor comprising an outer shell 11 holding an array of permanent magnets 27, with the flux from the magnets passing across the space 28, then amongst the windings 25 comprising a plurality of wound poles and entering that part of the stator 3 comprising the layers of steel coiled strip 4', 4", and 4'" to complete the circuit.
  • This Figure shows that the flux path becomes substantially confined to the high permeability layer(s) formed from the steel coiled strip.
  • This arrangement has a single cylindrical ring magnet 41 on an internal rotor 40, i.e. the permanent magnetic poles are on the outer face of the rotor 40, and are surrounded by the wound poles 42 on the inner cylindrical face of the stator 43.
  • the wound poles 42 contact a layer 51 of soft magnetic material wound from annealed steel tape, in a spiral configuration.
  • This spiral layer 51 of steel tape is embedded in a low-magnetic permeability substrate 44 forming part of the stator.
  • the rotor is mounted on a shaft 45 which is mounted in bearings 46, 47 in end plates 48, 49.
  • Figure 8a shows a 6 pole machine using 12 bar magnets 27 in pairs to create the effect of wider magnets. This is similar to Figure 3 but without showing the flux paths.
  • 25 represents the windings
  • 11 represents the outer shell of the rotor which holds the magnets
  • 3 represents the ferromagnetic layer, the coiled strip.
  • Figure 8b shows the stator voltage for different rotor positions for one phase only of the three phase stator windings of the motor/alternator of Figures la to lc.
  • the degrees scale refers to electrical phase, not to mechanical rotation of the motor.
  • the closely spaced magnetic poles create "flat-topped” waveforms, and this is a characteristic of all of the motors illustrated in the accompanying Figures.
  • Figure 7 is a graph of magnetic coercivity H (in Ampere-turns metre ⁇ l ) against flux B in Teslas for a soft magnetic material such as annealed steel coiled strip.
  • the designation "A” refers to Ampere-turns, i.e. 1 Ampere in 1 turn coil.
  • Silicon steel is preferred in building prototypes of the invention as it is inexpensive and readily available. It is often used in transformer laminations. However other soft magnetic materials in coiled strip or tape form may be used. Examples include iron; iron alloys such as iron-cobalt alloys, Permendur*, Supermendur*; iron-silicon alloys; nickel-iron alloys, Mumetal*, Supermumetal*, Supermalloy*. Invars*, Elinvars,
  • Amorphous Alloys steel alloys; and ferrites.
  • An asterisk denotes a trade name mentioned on pages 95- 104 of Magnetism and Magnetic Materials by J P Jakubovics, published by The Institute of Metals, 1987, ISBN 0-904357-95-3, which contains a useful discussion of "soft magnetic” materials].
  • the material should have a magnetic permeability of more than 20 (relative to air) and most probably will have a permeability in the range of 100-1000 (relative to air).
  • Some materials, such as Mu- metal may require an annealing process after deformation into a coil if the strip thickness is large in comparison with the bending radius and the crystal structure of the alloy is damaged.
  • the depth of soft magnetic material preferably would not exceed 4 to 5mm for most medium speed motors.
  • a 16 pole motor with a stator diameter of 110mm and operating at 1500 rpm (a frequency of 200 Hz) may have 3 layers of annealed steel of between 1 and 1.6mm diameter giving a depth of magnetic material of approximately 3-5mm.
  • the coiled strip thickness is not greater than about 1mm, to keep eddy current losses down, and to allow wrapping.
  • a larger coiled strip thickness could be used. There should be a sufficient depth of coiled strip to provide a good magnetic path between adjacent poles.
  • a large slow motor (operating at say 50 Hz) could perhaps use 6 layers of annealed steel coiled strip up to 3mm in diameter.
  • Such a motor as shown in Figures la-lc may have a stator diameter of 150mm with 3 spiral layers of steel coiled strip of 1mm diameter providing a magnetic layer of 3mm thickness and covered with a wound pole layer of 3mm thickness.
  • a similar diameter 2 pole motor requires a much thicker magnetic layer, of approximately 20mm thick, typically 10 layers of 2mm diameter steel coiled strip. Such a motor will suffer from much greater steel losses - with resulting evolution of heat - than the 20 pole machine unless it is operated only at slow speeds.
  • each layer could be formed from a plurality of loops on the substrate.
  • phase windings may be used, and in particular 1, 2 and 4 phase configurations will now be described.
  • Single phase co-axial alternators are the most simple configuration of stator for this machine and can find uses where simplicity of construction outweighs absolute output power.
  • the three phase equivalent produces twice the output power for the same resistive losses, and 50 per cent additional copper in the stator windings.
  • Single phase co-axial motors are the most simple configuration of stator for this machine, but required some means of starting (similar to single phase induction motors) and therefore require an additional winding or mechanical means to ensure starting. In areas of low starting torque requirements i.e. direct coupled fans there could be a use for single phase motors.
  • Two Phase Co-Axial Motors Due to two phase operation there are no starting problems, but if the machine is to be electronically controlled from a direct current supply then efficiency could be low if 180 degree current injection is used.
  • the two phase motor could be electronically controlled to provide the 180 degree current injection just for starting and reduce to 120 degrees or less for normal running operation.
  • This machine provides an increase in output power for the same resistive losses as a single or double phase machine. If the three phase machine uses the same amount of copper as a two phase machine and the stator windings of both machines occupy the full 360° available, then the three phase machine can produce a further 7% output power over the two phase machine for the same resistive losses (i.e. 47% increase over the single phase machine).
  • Co- axial Motors Slightly higher efficiency possible due to possible smaller current injection angle.
  • the four phase motor has possible applications, due to simplicity of electronically controlled reversing of rotor direction.
  • the wound poles are formed on one or the other of the rotor or the stator and the permanent magnetic poles are provided on the remaining one of the stator or the rotor.
  • the steel coiled strip may be provided on the stator of a linear motor or on the stator or rotor of a pancake motor.
  • the rotor may be provided with a band of permanent magnetic poles then a band of wound poles and associated steel coiled strip layer(s) (which may be repeated along its length) and the stator would then be provided with the opposite configuration so that a band of wound poles and layer(s) of steel coiled strip on the stator face the band of permanent magnetic poles on the rotor, and a band of permanent magnetic poles on the stator face the band of wound poles and layer(s) of steel coiled strip on the rotor.

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

Abstract

Un moteur coaxial cylindrique sans balais et à courant continu comprend un stator cylindrique interne (16) et un rotor externe (11) contenant des aimants permanents (27). Le stator cylindrique (16) présente un substrat (24) de plastique renforcé sous la forme d'une bobine ayant des brides externes (24C, 24D) entourant un creux peu profond (24E) contenant une ou plusieurs longueurs de bande (3) formées en un matériau magnétique tendre. La bande (3) a une largeur équivalente à la largeur du creux (24E). La bande est enroulée autour du substrat (24) et sa surface externe est dans le même plan que la circonférence externe de brides (24C, 24D). La bande (3) est enroulée en une spirale similaire à celle d'un ressort de montre. Les enroulements de pôles (25) sont superposés sur la bande (3) et s'étendent sur les brides (24C, 24D) du substrat.
PCT/NZ1993/000084 1992-09-14 1993-09-10 Machine dynamoelectrique et stators destines a celle-ci Ceased WO1994007295A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU49871/93A AU4987193A (en) 1992-09-14 1993-09-10 Dynamoelectric machine and stators therefor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ244334 1992-09-14
NZ24433492 1992-09-14

Publications (1)

Publication Number Publication Date
WO1994007295A1 true WO1994007295A1 (fr) 1994-03-31

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011045479A3 (fr) * 2009-10-12 2011-06-16 Julien Gillonnier Machine electrique a bobines spiralees fixes ou mobiles
US9214845B2 (en) 2013-03-11 2015-12-15 Tempel Steel Company Process for annealing of helical wound cores used for automotive alternator applications
EP2587630B1 (fr) * 2010-07-26 2016-07-27 Dong Ming Motor Electric (Shenzhen) Co., Ltd. Moteur à ferroalliage amorphe sans encoches, comportant un circuit magnétique radial et procédé de fabrication de ce moteur
CN113178969A (zh) * 2021-04-21 2021-07-27 肇庆凌飞航空科技有限公司 一种定位装置及电机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU7307274A (en) * 1973-09-11 1976-03-11 Westinghouse Electric Corp Wound magnetic cores
CA1136200A (fr) * 1979-08-09 1982-11-23 Vernon B. Honsinger Moteur a stator sans fente en metal amorphe
DE3920549A1 (de) * 1989-06-23 1991-01-24 Guenther Schmidt Gehaeuse fuer elektromotor
WO1991011842A1 (fr) * 1990-02-01 1991-08-08 James William Piper Stator pour machine dynamoelectrique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU7307274A (en) * 1973-09-11 1976-03-11 Westinghouse Electric Corp Wound magnetic cores
CA1136200A (fr) * 1979-08-09 1982-11-23 Vernon B. Honsinger Moteur a stator sans fente en metal amorphe
DE3920549A1 (de) * 1989-06-23 1991-01-24 Guenther Schmidt Gehaeuse fuer elektromotor
WO1991011842A1 (fr) * 1990-02-01 1991-08-08 James William Piper Stator pour machine dynamoelectrique

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011045479A3 (fr) * 2009-10-12 2011-06-16 Julien Gillonnier Machine electrique a bobines spiralees fixes ou mobiles
EP2587630B1 (fr) * 2010-07-26 2016-07-27 Dong Ming Motor Electric (Shenzhen) Co., Ltd. Moteur à ferroalliage amorphe sans encoches, comportant un circuit magnétique radial et procédé de fabrication de ce moteur
US9214845B2 (en) 2013-03-11 2015-12-15 Tempel Steel Company Process for annealing of helical wound cores used for automotive alternator applications
CN113178969A (zh) * 2021-04-21 2021-07-27 肇庆凌飞航空科技有限公司 一种定位装置及电机
CN113178969B (zh) * 2021-04-21 2022-05-17 肇庆凌飞航空科技有限公司 一种定位装置及电机

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