WO2010097285A2 - Stator with intermediate teeth - Google Patents
Stator with intermediate teeth Download PDFInfo
- Publication number
- WO2010097285A2 WO2010097285A2 PCT/EP2010/051491 EP2010051491W WO2010097285A2 WO 2010097285 A2 WO2010097285 A2 WO 2010097285A2 EP 2010051491 W EP2010051491 W EP 2010051491W WO 2010097285 A2 WO2010097285 A2 WO 2010097285A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stator
- tooth
- span
- teeth
- stator teeth
- Prior art date
Links
- 230000004907 flux Effects 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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
- H02K3/28—Layout of windings or of connections between windings
-
- 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
- H02K1/145—Stator cores with salient poles having an annular coil, e.g. of the claw-pole type
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
-
- 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
- H02K15/04—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of windings, prior to mounting into machines
- H02K15/0435—Wound windings
Definitions
- the present invention relates to improving a winding factor of an electrical machine by modifying stator slots.
- a concentrated winding topology means that each armature coil is wound around one single stator tooth in an electrical machine.
- Such winding configuration offers a large reduction of copper material compared with distributed winding topology where the coils are wound in laps enclosing several stator teeth.
- the coil overhang of the distributed winding topology produces unnecessary copper losses and extends the stator' s axial dimension, which reduces torque density (or power density for given speed) .
- the concentrated winding topology thus provides the advantages of reduced total active volume and weight of the machine.
- the use of less coil material also offers a favourable reduction in copper loss and hence a high torque density motor design can be obtained.
- a flux linkage between rotor poles and the coils i.e. a winding factor
- the maximum average torque output is directly proportional to the winding factor, a higher winding factor implying a higher output torque for a motor with a given frame size.
- the distributed winding topology provides a winding factor equal to or nearly equal to the ideal value of one.
- Concentrated winding topology typically has a lower winding factor lying within the range of 0,93-0,96.
- an ideal winding factor can be easily achieved with a concentrated winding topology by choosing the number of stator teeth being equal to the number of rotor poles, but in practice this causes a severe cogging problem.
- the rotor pole number is typically different from the stator teeth number. In most cases the rotor pole number is less than the stator teeth number, but in the following example, in order to better illustrate the present invention, a conventional machine is chosen to have a rotor pole number which is greater than the stator tooth number.
- Figure 1 shows a conventional PM machine 100 with concentrated armature coils 102, a stator 104 having 18 teeth 106 and the rotor 108 having 20 poles 110 (10 pole pairs) .
- the coils 102 are arranged in two winding periodicities 112, each winding periodicity 112 comprising three stator tooth sections 114 representing three electrical phases, and each stator tooth section 114 comprising three stator teeth 106 in a same electrical phase.
- the stator teeth 106 are distributed along a circumference of the stator 104 with a uniform tooth span 115 i.e. a uniform angular distance between two adjacent stator teeth 106.
- the stator teeth 106 are separated from one another by stator slots 118.
- One object of the invention is to provide a stator for an electrical machine with an improved torque density.
- a further object of the invention is to provide an electrical machine with an improved torque density.
- a yet further object of the invention is to provide a method for improving the torque density of an electrical machine.
- a stator for an electrical machine comprising a plurality of stator teeth, the stator teeth being separated from one another by stator slots, each stator tooth being surrounded by a concentrated armature coil, the armature coils representing two or more different electrical phases, the stator teeth being distributed in a non-uniform pattern along a circumference of the stator, the non-uniform pattern comprising at least one short tooth span and at least one long tooth span, the short tooth span having a smaller dimension than the long tooth span, wherein none of the stator slots between two stator teeth distanced by a short tooth span is configured to carry magnetic flux while each of the stator slots between two stator teeth distanced by a long tooth span comprises an intermediate tooth for carrying a magnetic flux.
- stator with a non-uniform stator tooth pattern comprising short and long tooth spans, and by introducing intermediate teeth between stator teeth distanced by a long tooth span, both the winding factor and the distribution of the flux carrying material can be optimized.
- Providing long tooth spans according to this principle results to a relatively high number of relatively narrow intermediate teeth. This increases the number of alternatives when dividing the stator into a plurality of segments.
- each winding periodicity comprising one stator tooth section for each different electrical phase, each stator tooth section comprising one or more stator teeth with coils in the same electrical phase.
- the stator is divided into segments such that a contact surface between two adjacent segments crosses at least one intermediate tooth. Dividing a stator into segments improves the handling of the stators as such stators can have very large dimensions leading to problems in transport and logistics. By situating the contact surfaces between adjacent segments at the intermediate teeth the magnetic properties of the stator are minimally affected. The fact that the intermediate teeth are not surrounded by any coil makes them ideal to be used for connecting the adjacent segments mechanically together.
- the stator is divided into six, three or two segments. These are the natural number of segments following from the number of intermediate teeth in the preferred embodiments of the invention.
- the stator is comprised in an electrical machine which further comprises a rotor having a plurality of poles, wherein the short tooth span is substantially equal to a pole span.
- a winding factor equal to one is achieved by making the short tooth span to correspond to the pole span.
- the poles comprise permanent magnets. Permanent magnet poles are preferred for their simplicity even if electrically excited poles may also be used.
- the pole number is greater than the stator tooth number.
- a method for improving a torque density of an electrical machine comprising the steps of: providing a stator comprising a plurality of stator teeth, the stator teeth being separated from one another by stator slots, each stator tooth being surrounded by a concentrated armature coil, the armature coils representing two or more different electrical phases, the stator teeth being distributed in a non-uniform pattern along a circumference of the stator, the non-uniform pattern comprising at least one short tooth span and at least one long tooth span, the short tooth span having a smaller dimension than the long tooth span; configuring the stator slots between two stator teeth distanced by a short tooth span not to carry magnetic flux; and providing each of the stator slots between two stator teeth distanced by a long tooth span with an intermediate tooth for carrying a magnetic flux.
- figure 1 shows a conventional PM machine with a uniform tooth span
- figure 2 shows one embodiment of the invention with intermediate teeth between stator teeth in different stator tooth sections
- figure 3 shows one embodiment of the invention with one intermediate tooth per winding periodicity
- figure 4 shows one winding periodicity for a conventional machine and for two embodiments of the invention
- figure 5 shows stator stars of plots for a conventional machine and for one embodiment of the invention.
- a PM machine 100 which comprises the same number of stator teeth 106, rotor poles 110, winding periodicities 112 and electrical phases as the machine 100 according to figure 1.
- the stator teeth 106 are, however, not distributed with uniform distances. Instead, there is provided a long tooth span 117 between stator teeth 106 in different stator tooth sections 114, and a short tooth span 116 between the stator teeth 106 within each stator tooth section 114.
- the short tooth span 116 is equal to a pole span 120 i.e. an angular distance between two rotor poles 110.
- the width (in degrees) of each long tooth span 117 is l) ⁇ times the width of each pole span 120.
- Intermediate teeth 122 are introduced between the stator teeth 106 in different stator tooth sections 114, the width of each intermediate tooth 122 corresponding to ) ⁇ of the pole span 120.
- a PM machine 100 which again comprises the same number of stator teeth 106, rotor poles 110, winding periodicities 112 and electrical phases as the machine 100 according to figure 1.
- a long tooth span 117 is provided between stator teeth 106 in different winding periodicities 112 while the stator teeth 106 within each winding periodicity 112 are separated by a short tooth span 116.
- the long tooth span 117 is two times the pole span 120.
- Intermediate teeth 122 are introduced between the stator teeth 106 in different winding periodicities 112, the width (in degrees) of each intermediate tooth 122 corresponding to the pole span 120.
- Figure 4a shows one winding periodicity 112 for the conventional machine 100 according to figure 1 while figures 4b and 4c show the same for the machines 100 according to figures 2 and 3, respectively. It can be seen that in the machines 100 with non-uniform tooth spans 116, 117 all the stator teeth 106 within each stator tooth section 114 (see figure 4b, phase C) or winding periodicity 112 (see figure 4c) , are at a certain point of time perfectly aligned with respective rotor poles 110. Such perfect alignment enables the ideal winding factor value of one. In the conventional machine 100 the perfect alignment is never reached (see figure 4a) , and consequently the winding factor will always remain under the ideal value.
- the winding factor can be illustrated by utilizing the orientation of phasor elements E of a voltage induced on each individual coil side within the stator slots 118.
- the phasor elements E 7 for the designs of figures 4a and 4b are shown in the stator stars of plots 128 of figures 5a and 5b.
- the orientations of the phasor elements E in the figures are given in electrical angles, an angular distance occupied by one pole pair corresponding to 360°.
- a first angular distance 124 corresponding to the uniform tooth span 115 of figure 4a is 200°.
- the phasor elements E corresponding to the coil sides of the same electrical phase in different stator slots 118 are not in the same direction, and when these phasor elements E are summed as further illustrated in figure 5a, the magnitudes of the resulting phasors E 4+ and E A _ are less than the sum of the magnitudes of individual phasor elements E 7 .
- the phasor elements E corresponding to the coil sides of the same electrical phase in different stator slots 118 are all aligned in the same direction, and when these phasor elements E are summed, the magnitudes of the resulting phasors E 4+ and E A _ are equal to the sum of the magnitudes of individual phasor elements E .
- the long tooth spans 117 cause the phasor elements E ⁇ in two adjacent stator tooth sections 114 to be angled by a second angular distance 126 of 60° corresponding to the width of an intermediate tooth 122.
- the fundamental winding factor k wi can be increased from 0.945 to one by aligning all the voltage phasor elements E ⁇ in the same direction.
- stator star of plots for the design of figure 4c is not shown, but since all the stator teeth 106 within the winding periodicity 112 are separated by a short tooth span 116, and since the width of the intermediate teeth 122 corresponds to an angular distance of 180°, such star of plots would exhibit all the phasor elements E ⁇ aligned on one horizontal line.
- the intermediate teeth 122 provide an ideal location for a contact surface between two of such segments. Since the intermediate teeth 122 are not surrounded by any coil 102, they can efficiently be used for connecting adjacent segments mechanically together. A contact surface at an intermediate tooth 122 also has a minimal effect on magnetic properties of the stator 104 because the magnetic flux can at least partially flow through one half of an intermediate tooth 122 without crossing the contact surface.
- a stator 104 can be divided in segments in a plurality of ways.
- the stator 104 of figure 2 can be divided in six segments, each segment comprising one stator tooth section 114, or in three segments, each segment comprising two stator tooth sections 114, or in two segments, each segment comprising three stator tooth sections 114.
- the number of segments may be further increased by providing additional intermediate teeth 122.
- the segments do not need to be of equal size, and obviously any appropriate combination of different size segments may be used.
- the stator 104 of figure 2 can be divided in four segments, one segment comprising three stator tooth sections 114, and three segments comprising one stator tooth section 114 each.
- stator teeth 106, rotor poles 110, winding periodicities 112 and electrical phases is not limited to those presented in the above embodiments, but these can be selected freely within reasonable limits. It is also not excluded to introduce intermediate tooth-like elements between two stator teeth 106 distanced by a short tooth span 116 as far as these elements are not configured to carry magnetic flux. Such elements can be introduced e.g. for cooling purposes or for supporting the armature coils 102 mechanically .
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Windings For Motors And Generators (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011551453A JP2012519459A (en) | 2009-02-27 | 2010-02-08 | Stator permanent magnet machine winding configuration |
CN201080007791.0A CN102318167B (en) | 2009-02-27 | 2010-02-08 | Stator with intermediate teeth |
EP10702510A EP2401802A2 (en) | 2009-02-27 | 2010-02-08 | Stator with intermediate teeth |
US13/219,660 US8680740B2 (en) | 2009-02-27 | 2011-08-27 | Stator with intermediate teeth |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09153981A EP2224578A1 (en) | 2009-02-27 | 2009-02-27 | Stator winding scheme of a permanent magnet machine |
EP09153981.7 | 2009-02-27 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/219,660 Continuation US8680740B2 (en) | 2009-02-27 | 2011-08-27 | Stator with intermediate teeth |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2010097285A2 true WO2010097285A2 (en) | 2010-09-02 |
WO2010097285A3 WO2010097285A3 (en) | 2010-12-23 |
Family
ID=40798130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2010/051491 WO2010097285A2 (en) | 2009-02-27 | 2010-02-08 | Stator with intermediate teeth |
Country Status (6)
Country | Link |
---|---|
US (1) | US8680740B2 (en) |
EP (2) | EP2224578A1 (en) |
JP (1) | JP2012519459A (en) |
KR (1) | KR20110132346A (en) |
CN (1) | CN102318167B (en) |
WO (1) | WO2010097285A2 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9359994B2 (en) | 2010-09-23 | 2016-06-07 | Northern Power Systems, Inc. | Module-handling tool for installing/removing modules into/from an electromagnetic rotary machine having a modularized active portion |
US9281731B2 (en) | 2010-09-23 | 2016-03-08 | Northem Power Systems, Inc. | Method for maintaining a machine having a rotor and a stator |
US8912704B2 (en) * | 2010-09-23 | 2014-12-16 | Northern Power Systems, Inc. | Sectionalized electromechanical machines having low torque ripple and low cogging torque characteristics |
WO2013116506A1 (en) * | 2012-02-03 | 2013-08-08 | Green Ray Technologies Llc | Electric machines and methods of making same |
JP6327803B2 (en) * | 2013-07-09 | 2018-05-23 | 久慶 ▲ふく▼楊 | High-power, high-efficiency single-phase multipolar generator |
US9742228B2 (en) | 2013-10-18 | 2017-08-22 | General Electric Company | Torque ripple reduction in electric machines |
DE102014200947A1 (en) * | 2014-01-20 | 2015-08-06 | Wobben Properties Gmbh | Synchronous generator of a gearless wind turbine |
DE102016108712A1 (en) | 2016-05-11 | 2017-11-16 | Wobben Properties Gmbh | Synchronous generator of a gearless wind turbine and method for producing a synchronous generator and use of form coils |
FR3071369B1 (en) * | 2017-09-18 | 2023-09-01 | Ifp Energies Now | ELECTRIC MACHINE COMPRISING A STATOR PROVIDED WITH AN INTERNAL TUBULAR SLEEVE |
US10833543B2 (en) | 2017-10-02 | 2020-11-10 | Ge Aviation Systems Llc | Stator assembly |
DE102017128827A1 (en) * | 2017-12-05 | 2019-06-06 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Multi-tooth coil winding for a 2-phase induction machine |
CN108880014B (en) * | 2018-05-29 | 2021-10-29 | 南方电机科技有限公司 | Stator, motor and automation equipment |
US20210218295A1 (en) * | 2018-07-06 | 2021-07-15 | Mitsubishi Electric Corporation | Rotating electric machine |
CN109831085A (en) * | 2019-02-15 | 2019-05-31 | 深圳市配天电机技术有限公司 | Switched reluctance machines, electric car and electrical equipment |
GB2582941B (en) * | 2019-04-09 | 2023-08-02 | Centre Nat Rech Scient | A stator winding arrangement |
GB201913015D0 (en) * | 2019-09-10 | 2019-10-23 | Rolls Royce Plc | electrical systems |
CN110739823B (en) * | 2019-12-11 | 2021-05-11 | 山东理工大学 | Permanent magnet driving motor of electric automobile |
Family Cites Families (17)
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US4883999A (en) * | 1988-08-15 | 1989-11-28 | Pacific Scientific Company | Polyphase electronically commutated reluctance motor |
US5095238A (en) * | 1990-04-03 | 1992-03-10 | Minebea Co., Ltd. | Brushless dc motor and rotor magnet |
JPH09233790A (en) * | 1996-02-27 | 1997-09-05 | Kokusan Denki Co Ltd | Internal combustion engine-driven generator for operating discharge lamp and discharge lamp operating device |
US6094011A (en) * | 1995-06-26 | 2000-07-25 | Kokusan Denki Co., Ltd | Discharge lamp lighting device driven by internal combustion engine |
JP3395071B2 (en) * | 1996-04-25 | 2003-04-07 | ミネベア株式会社 | Motor structure |
JPH10234144A (en) * | 1997-02-19 | 1998-09-02 | Hitachi Ltd | Concentrated winding electric rotating machine |
JPH11234990A (en) * | 1998-02-12 | 1999-08-27 | Okuma Corp | Permanent magnet motor |
JP2000228838A (en) * | 1998-12-01 | 2000-08-15 | Toyota Motor Corp | Permanent magnet motor |
JP4399943B2 (en) * | 2000-02-29 | 2010-01-20 | 株式会社富士通ゼネラル | Permanent magnet motor |
JP2004215483A (en) * | 2002-05-29 | 2004-07-29 | Matsushita Electric Ind Co Ltd | Motor generator |
WO2003100949A1 (en) | 2002-05-29 | 2003-12-04 | Matsushita Electric Industrial Co., Ltd. | Motor generator |
JP2004304928A (en) * | 2003-03-31 | 2004-10-28 | Mitsuba Corp | Brushless motor |
US7122933B2 (en) * | 2004-05-19 | 2006-10-17 | Emerson Electric Co. | Reduced coil segmented stator |
DE102004055317A1 (en) * | 2004-11-16 | 2006-05-24 | Bosch Rexroth Aktiengesellschaft | Electric induction machine and primary section |
DE102004058046B4 (en) * | 2004-12-01 | 2012-10-31 | Siemens Ag | High-pole permanent-magnet synchronous machine with toothed coils |
US8084913B2 (en) * | 2005-10-06 | 2011-12-27 | Borgwarner Inc. | DC motor with asymmetrical poles |
TW200847584A (en) * | 2007-05-25 | 2008-12-01 | Azure Shine Int Inc | Brushless permanent magnet motor with unequal width tooth slots and its manufacturing method |
-
2009
- 2009-02-27 EP EP09153981A patent/EP2224578A1/en not_active Withdrawn
-
2010
- 2010-02-08 CN CN201080007791.0A patent/CN102318167B/en active Active
- 2010-02-08 EP EP10702510A patent/EP2401802A2/en not_active Withdrawn
- 2010-02-08 WO PCT/EP2010/051491 patent/WO2010097285A2/en active Application Filing
- 2010-02-08 JP JP2011551453A patent/JP2012519459A/en active Pending
- 2010-02-08 KR KR1020117019935A patent/KR20110132346A/en not_active Application Discontinuation
-
2011
- 2011-08-27 US US13/219,660 patent/US8680740B2/en active Active
Non-Patent Citations (1)
Title |
---|
JURGEN FRIEDRICH, BAUFORMEN UND BETRIEBSVERHALTEN MODULARER DAUERMAGNETMASCHINEN, 1997, pages 28 - 36 |
Also Published As
Publication number | Publication date |
---|---|
CN102318167A (en) | 2012-01-11 |
EP2224578A1 (en) | 2010-09-01 |
WO2010097285A3 (en) | 2010-12-23 |
US20110309712A1 (en) | 2011-12-22 |
EP2401802A2 (en) | 2012-01-04 |
KR20110132346A (en) | 2011-12-07 |
CN102318167B (en) | 2014-09-17 |
JP2012519459A (en) | 2012-08-23 |
US8680740B2 (en) | 2014-03-25 |
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