EP2067241A2 - Electronic machines with composite poles - Google Patents
Electronic machines with composite polesInfo
- Publication number
- EP2067241A2 EP2067241A2 EP07834873A EP07834873A EP2067241A2 EP 2067241 A2 EP2067241 A2 EP 2067241A2 EP 07834873 A EP07834873 A EP 07834873A EP 07834873 A EP07834873 A EP 07834873A EP 2067241 A2 EP2067241 A2 EP 2067241A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pole
- coils
- stator
- pole pieces
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
-
- 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
- H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
-
- 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
- H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
- H02K2203/12—Machines characterised by the bobbins for supporting the windings
Definitions
- the invention generally relates to electrodynamic machines in which the poles are separated from the remainder of the magnetic structure.
- the invention relates to an electrodynamic machine in which the pole windings and the pole face which is contiguous the relatively moving part of the machine are created separated from the magnetic material which acts as the return path for the magnetic flux.
- Electrodynamic machines such as motors and generators typically consist of a stator and a rotor, one of which carries pole pieces associated with coils which, in the case of a motor, are energised by a current while the other either has permanent magnets or electromagnets to create a flux against which the coils act. Normally there are many pole pieces with their associated coils and the number of connections to these encourage the placement of this part of the machine as the stator, while the magnetic field creation portion is the rotor.
- the stator requires a flux path to return the magnetic flux from the pole pieces via the magnetic flux creation path to the rear of the pole pieces. This is normally done with a path through an adjacent pole or poles or through the support structure to the magnetic structure supporting the pole pieces at the rear.
- a magnetic structure is complex to assemble and expensive to manufacture as the coils for the pole pieces normally need to be shaped to fit the poles and the backing magnetic structure.
- US patent specification 7067944 shows a typical example of such a construction in which the stator structure is injection moulded to the baseplate.
- the invention consists in an electrodynamic machine having a unitary annular first structure comprising multiple magnetically isolated pole pieces arranged around an axis, each pole piece having a first face and a second face and at least one pole coil located on each pole piece between the first and second faces, a second structure rotatably mounted on the first structure axis and comprising a magnetic flux creation device for each pole piece wherein there exists a magnetic flux conducting path via the second structure., from a first face of each pole piece via at least one magnetic flux creation device to the second face of the pole piece.
- the machine is an axial flux machine and the pole pieces are radially arranged around the axis.
- the machine is a radial flux machine and the pole pieces are axially arranged around the axis.
- pole pieces are trapped between a common base plate and a common top plate.
- each pole piece carries a groove at each end to facilitate the trapping.
- the groove is arcuate and coacts with a corresponding projection on the base plate or top plate.
- the machine is a drum machine.
- each pole coil is wound on a bobbin.
- the substrate is created by injection moulding.
- the second structure has a band of magnetic structure located adjacent the outer faces of the poles.
- the " band forms part of the second structure.
- the band is inside the first structure and the permanent magnets are outside the first structure.
- the band and magnets are mounted to the same magnetic material "Preferably the first structure is stationary and the second structure rotates.
- the magnetic flux creation devices are permanent magnets.
- the invention relates to a method of constructing a radial flux electrodynamic machine having a unitary annular stator structure comprising providing a plurality of pole pieces, mounting pole coils to the pole pieces and assembling the pole pieces and coils to form an annular stator with each pole axis radially oriented , embedding the pole pieces and coils in a substrate to thereby unitise the stator, assembling magnetic field creating elements and a pole piece backing element in a rotor with at least one magnetic flux path between the magnetic field creating elements and the " pole piece backing element and assembling the stator and rotor.
- pole coils are wound on bobbins and the bobbins are placed on pole pieces.
- pole pieces and bobbins are retained in place on a base plate prior to embedding the pole pieces and coils.
- the invention relates to a method of constructing an annular flux electrodynamic machine having a unitary annular stator structure comprising providing a plurality of pole pieces, mounting pole coils to the pole pieces and assembling the pole pieces and coils to form an annular stator with each pole axis axially oriented , embedding the pole pieces and coils in a substrate to thereby unitise the stator, assembling magnetic field creating elements and a pole piece backing element in a rotor with at least one magnetic flux path between the magnetic field creating elements and the pole piece backing element and assembling the stator and rotor.
- FIG. 1 is a sectioned perspective view of a motor according to the invention.
- FIG. 2 is a cross section of the rotor of FIG. 1.
- FIG. 3 is a cross section of the stator of FIG. 1
- FIG.4 is a cross section on line 4-4 of the stator of FIG. 3
- FIG. 5 is an exploded view of the stator of FIG. 1
- FIG. 6 is an exploded view of a winding and pole piece of FIG. 5. -
- FIG. 7 is a sectioned view of a radial flux motor according to the invention.
- FIG. 8 is a sectioned perspective view of an axial flux motor according to the invention.
- a motor according to one exemplification of the invention is shown in cross section and consists of an outer casing 101, a rotor 102 and a stator 102.
- the rotor 102 consists of an axle 201 journalled in bearings 202, 203.
- a cup 204 of magnetic material such as iron or soft steel carries magnets 205 and a back iron 206.
- the magnets face alternately north and south pole inwards. Magnetic flux is conducted through the rotor body 204 from the magnets to the back iron 206, which may be of laminated form.
- stator 103 Co-operating with rotor 102 is stator 103 shown in FIG. 3, with a cross section in FIG. 4 and detail in FIG. 5.
- a base plate 301 which locates on bearing 203 receives an assemblage of magnetically isolated pole pieces such as 302 carrying coils wound on bobbins 303. This assemblage is encapsulated in a suitable potting material 304 and-is fixed to the base plate typically by through bolts.
- a suitable potting material may be any non-conductive material with a modulus of expansion approximating that of the bobbins and pole pieces and adhering to them, and a strength and modulus of elasticity sufficient to maintain the part placement while reducing the likelihood of brittle fracture.
- Most electronic component epoxy or polyurethane potting compounds are suitable and thermoplastics may also be used in low temperature applications.
- the pole pieces may be assemblies of laminated steel but preferably they are moulded pieces of magnetic powder and may be fired ferritic components or pressure moulded adhesive, magnetic powder of the required qualities. Each pole piece is isolated magnetically from the other pole pieces, that is, there are no magnetic members bridging between the pole pieces within the stator. This reduces the amount of magnetic material required to form the stator, reducing the cost and weight of the stator assembly.
- FIG. 5 shows base 301 with a recess to receive the pole pieces 302 when fitted with windings 303.
- the. windings consist of a bobbin 601 which receives a winding 602.
- the winding and bobbin may be tapered at one side to allow the windings to be as close together as possible.
- a groove 603 at each end of a pole piece co-acts with a projection 503 on the " base and a similar projection on end cap 502-to-prevent ; movement notebook ⁇ £ the.pole pieces.
- Cap 502 is retained by bolts 501.
- the assemblage of pole pieces and windings may be potted into an integral assembly prior to assembling it to the base, or it may be potted once assembled to the base, thus rendering the stator an integral assembly.
- FIG. 7 and EIG. 8 show respectively a sectioneiside view and a sectioned perspective view of an axial flux version of a motor in which a motor casing 701 has a stator 702 secured to it by screws at 703.
- the stator 702 is an injection moulded assembly having embedded within it coils 704 which may be wound within bobbins 705 and which are mounted around pole pieces 706.
- the coils 704, which may be sectorial in plan, may be wound on bobbing for ease of manufacture, although coils wound _ directly upon the pole pieces .706 and injection moulded into a whole are an alternative construction.
- Case 701 may be moulded as either a zinc based die casting or as injection moulded r fibre reinforced plastic, since " no magnetic material is required in the case.
- Disc 710 is attached to the remainder of the rotor 708 by screw in holes 711.
- Affixecf to disc 709 is a back iron continuous annular strip 712.
- affixed to the upper disc 710 is a. magnet ring 713, with a magnet formed for each pole 706.
- the magnets may be sectorial magnets secured to a back iron such as that at 712.
- the back iron 712 and magnet ring 713 act to provide a flux return path through the pole pieces, and hence the rotor may also be of injection moulded fibre reinforced plastics, albeit the top disc 7 ⁇ 0 must be secured to the bottom disc 709 after assembly.
- the bobbins are intentionally simple both " to wind and place, providing advantages in the construction g -of the motor while simultaneously achieving an efficiency comparable with current deformed winding technology.
- the construction provides a very compact motorjbrm containing only components which are simple to manufacture.
- the machine in the drum form may be constructed with either the back iron inside the coils or the back iron outside the coils
- the invention is used in the construction of motors, and generators which are employed it electrical, industry.
- the present invention is therefore industrially applicable.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ55007806A NZ550078A (en) | 2006-09-25 | 2006-09-25 | Electrical machines with composite poles |
NZ55007807 | 2007-09-04 | ||
PCT/NZ2007/000271 WO2008039081A2 (en) | 2006-09-25 | 2007-09-18 | Electronic machines with composite poles |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2067241A2 true EP2067241A2 (en) | 2009-06-10 |
EP2067241A4 EP2067241A4 (en) | 2012-02-22 |
Family
ID=39230700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07834873A Withdrawn EP2067241A4 (en) | 2006-09-25 | 2007-09-18 | Electronic machines with composite poles |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2067241A4 (en) |
JP (1) | JP2010504727A (en) |
AU (1) | AU2007300778B2 (en) |
CA (1) | CA2663646A1 (en) |
MX (1) | MX2009003204A (en) |
WO (1) | WO2008039081A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2835602T3 (en) * | 2018-01-12 | 2021-06-22 | Carrier Corp | Electromagnetic machine |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060066173A1 (en) * | 2002-06-26 | 2006-03-30 | Kim Pyung K | Brushless direct-current motor of radial core type having a structure of double rotors and method for making the same |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1324147A (en) * | 1971-09-17 | 1973-07-18 | Univ Southampton | Permanent magnet rotor for synchronous electric machine |
US5874796A (en) * | 1995-02-10 | 1999-02-23 | Petersen; Christian C. | Permanent magnet D.C. motor having a radially-disposed working flux gap |
JPH10322944A (en) * | 1997-05-19 | 1998-12-04 | Minebea Co Ltd | Motor structure and its manufacture |
JP3421251B2 (en) * | 1998-08-21 | 2003-06-30 | ミネベア株式会社 | Rotating electric machine and its bobbin |
US7145280B2 (en) * | 2000-04-19 | 2006-12-05 | Wellington Drive Technologies Limited | Stator for a dynamoelectric machine having a split ferromagnetic core |
-
2007
- 2007-09-18 WO PCT/NZ2007/000271 patent/WO2008039081A2/en active Application Filing
- 2007-09-18 CA CA002663646A patent/CA2663646A1/en not_active Abandoned
- 2007-09-18 JP JP2009529146A patent/JP2010504727A/en active Pending
- 2007-09-18 EP EP07834873A patent/EP2067241A4/en not_active Withdrawn
- 2007-09-18 MX MX2009003204A patent/MX2009003204A/en not_active Application Discontinuation
- 2007-09-18 AU AU2007300778A patent/AU2007300778B2/en not_active Ceased
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060066173A1 (en) * | 2002-06-26 | 2006-03-30 | Kim Pyung K | Brushless direct-current motor of radial core type having a structure of double rotors and method for making the same |
Non-Patent Citations (1)
Title |
---|
See also references of WO2008039081A2 * |
Also Published As
Publication number | Publication date |
---|---|
AU2007300778A1 (en) | 2008-04-03 |
MX2009003204A (en) | 2009-06-16 |
EP2067241A4 (en) | 2012-02-22 |
WO2008039081A2 (en) | 2008-04-03 |
CA2663646A1 (en) | 2008-04-03 |
WO2008039081A9 (en) | 2009-07-02 |
JP2010504727A (en) | 2010-02-12 |
AU2007300778B2 (en) | 2011-07-14 |
WO2008039081A3 (en) | 2008-07-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20090318 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA HR MK RS |
|
DAX | Request for extension of the european patent (deleted) | ||
A4 | Supplementary search report drawn up and despatched |
Effective date: 20120119 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: H02K 15/12 20060101ALN20120113BHEP Ipc: H02K 21/24 20060101ALN20120113BHEP Ipc: H02K 21/22 20060101ALN20120113BHEP Ipc: H02K 1/14 20060101AFI20120113BHEP |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20120818 |