US20050116573A1 - Armature windings and dynamo-electric machine using the same - Google Patents

Armature windings and dynamo-electric machine using the same Download PDF

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Publication number
US20050116573A1
US20050116573A1 US10/995,125 US99512504A US2005116573A1 US 20050116573 A1 US20050116573 A1 US 20050116573A1 US 99512504 A US99512504 A US 99512504A US 2005116573 A1 US2005116573 A1 US 2005116573A1
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US
United States
Prior art keywords
strands
strand
cross
groups
armature winding
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Abandoned
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US10/995,125
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English (en)
Inventor
Kenichi Hattori
Kazuhiko Takahashi
Kazumasa Ide
Takashi Shibata
Takashi Watanabe
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Hitachi Ltd
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Hitachi Ltd
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Assigned to HITACHI, LTD. reassignment HITACHI, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IDE, KAZUMASA, TAKAHASHI, KAZUHIKO, HATTORI, KENICHI, SHIBATA, TAKASHI, WATANABE, TAKASHI
Publication of US20050116573A1 publication Critical patent/US20050116573A1/en
Priority to US11/242,003 priority Critical patent/US7368842B2/en
Abandoned legal-status Critical Current

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    • 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
    • H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • H02K3/14—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots with transposed conductors, e.g. twisted 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
    • H02K1/16—Stator cores with slots for windings
    • 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
    • H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium

Definitions

  • the present invention relates to armature windings and a dynamo-electric machine using the same, and more particularly, to armature windings suitable for exposure to a varying magnetic field, such as armature windings of a turbine generator, by way of example, and a dynamo-electric machine using the same.
  • Armature windings for conventional turbine generators are described, for example, in U.S. Pat. No. 2,821,641.
  • a plurality of strands arranged in multiple tiers are transposed in the middle, and transpose angles of the strands are determined to be 360°, 540°, and the like, as shown in FIGS. 18A, 18B , depending on the power and mechanical dimensions of a particular type of machine for fitting in a slot, such that flux linkages are canceled out within the slot to reduce a loss caused by circulating currents which flow among strands.
  • FIG. 18A, 18B depending on the power and mechanical dimensions of a particular type of machine for fitting in a slot, such that flux linkages are canceled out within the slot to reduce a loss caused by circulating currents which flow among strands.
  • a strand 11 positioned at the topmost tier of the right row is transposed to the topmost tier of the left row, i.e., on a strand 1 ( 2 n ), and right-hand strands 12 , 13 positioned at the topmost tier of the right row are sequentially transposed to make the overall winding in a stranded structure.
  • the transpose angle used herein is a 360° transposition in which strands 11 , 15 wound from a shaft end I are transposed, and make a round to return to the same positions at a shaft end II, or a 540° transposition in which the strands are transposed further by an extra half cycle.
  • the angle such as 360° and 540 20 , and the pitch of transposition are selected such that magnetic fields interlining between windings are canceled out within a fixed iron core 30 .
  • the angle and pitch are selected such that a total of magnetic flux ⁇ 31 and ⁇ 33 interlining between strands 11 and 15 are equal to a magnetic flux ⁇ 32 which interlinks in a reverse direction.
  • JP-A-47-12513 also describes armature windings for a turbine generator. As illustrated in FIG. 19 , in this example, two rows of strand group 2 are disposed outside of a strand group 1 transposed over two rows, and strands 21 , 22 , 23 and the like are interposed to surround the strand group 1 . This is intended to reduce a circulating current loss caused by a radial flux ⁇ r2.
  • the magnetic flux ⁇ 1 interlinking at the end I of the strands 1 , 15 and the magnetic flux ⁇ 2 interlining at the end II have the polarities which cancel each other, but the magnetic fields ⁇ 1, ⁇ 2 are not equal in magnitude because the strands are different in radial position at the end I and end II.
  • the flux linkage corresponding to the difference ( ⁇ 1 ⁇ 100 2) in field strength, remains, thus making it difficult to thoroughly cancel out circulating currents which flow around the strands 11 , 15 .
  • FIG. 20 When a cross-sectional area of strands must be ensured, a winding as shown in FIG. 20 has been used, in which a plurality of transposed strand groups are arranged in parallel. Since such a structure cannot at all cancel out a radial magnetic flux ⁇ r2 which interlinks between the strand group 1 and strand group 2 , even an increased currents circulate among the strands.
  • JP-A-47-12513 which is a technique for reducing the radial magnetic flux, involves a complicated structure in which the strand group 2 is arranged in a double configuration to surround the strand group 1 , as illustrated in FIG. 19 , requiring a large number of manufacturing steps. Also, for example, the strand 11 must be transposed onto a strand 1 ( 2 n ), and a strand 21 is further transposed on the step, thus making it difficult to maintain a uniform gap between strands. For this reason, an appropriate insulating strength cannot be maintained.
  • the present invention provides an armature winding which comprises a strand group having strands transposed and bound in at least two rows and multiple tiers, and a main insulator for covering the strand group, wherein a flow resistance of a current passing though the strands on an upper and a lower side in the cross-section of the strand group is set larger than a flow resistance of a current which passes through the strands in a central portion.
  • the present invention also provides an armature winding which comprises a plurality of strand groups each having strands transposed and bound in at least two rows and multiple tiers, and a main insulator for covering the plurality of strand groups, wherein a flow resistance of a current passing though at least one of the plurality of strand groups is set larger than a flow resistance of a current which passes through the remaining strand groups.
  • FIG. 1 is a general view illustrating an outline of a turbine generator which employs armature windings of the present invention
  • FIG. 2 is a cross-sectional view illustrating an armature winding according to a first embodiment of the present invention
  • FIG. 3 is a cross-sectional view illustrating an armature winding according to a second embodiment of the present invention.
  • FIG. 4 is a cross-sectional view illustrating an armature winding according to a third embodiment of the present invention, when they are contained in a slot;
  • FIG. 5 is a cross-sectional view illustrating an armature winding according to a fourth embodiment of the present invention, when they are contained in a slot;
  • FIG. 6 is a cross-sectional view illustrating an armature winding according to a fifth embodiment of the present invention.
  • FIG. 7 is a cross-sectional view illustrating an armature winding according to a sixth embodiment of the present invention.
  • FIG. 8 is a cross-sectional view illustrating an armature winding according to a seventh embodiment of the present invention.
  • FIG. 9 is a cross-sectional view illustrating an armature winding according to an eighth embodiment of the present invention.
  • FIG. 10 is a cross-sectional view illustrating an armature winding according to a ninth embodiment of the present invention.
  • FIG. 11 is a diagram illustrating a conception of the whole length of armature windings using four rows of strands for explaining the relationship among a strand group, strands and flux linkage;
  • FIG. 12 is a diagram showing a relationship between the flux linkage and circulating current in FIG. 11 ;
  • FIGS. 13A, 13B are a current distribution graph of a conventional two-row winding and a cross-sectional view in this structure
  • FIGS. 14A, 14B are a current distribution graph of a conventional four-row winding and a cross-sectional view in this structure
  • FIGS. 15A, 15B are a current distribution graph in this structure and a cross-sectional view of the winding according to the second embodiment of the present invention.
  • FIG. 16 is a cross-sectional view illustrating an example of a conventional armature winding
  • FIG. 17 is a partial perspective view illustrating how strands are transposed in a conventional two-row winding
  • FIGS. 18A, 18B are conceptual diagrams illustrating how strands are arranged in a 540° transposition and in a 360° transposition, respectively;
  • FIG. 19 is a partial perspective view illustrating how strands are transposed in JP-A-47-12513.
  • FIG. 20 is a partial perspective view illustrating how strands are transposed in a conventional four-row winding.
  • FIG. 1 For describing some embodiments of the present invention, the structure of a turbine generator, to which the present invention is applied, will be generally described with reference to FIG. 1 .
  • the basic structure illustrated in FIG. 1 does not depend on the type of cooling fluid.
  • a rotor 51 is rotatably supported by a rotating shaft 50 to a stator frame 60 .
  • the rotor 51 internally has field windings (not shown), and serves as a magnetic pole.
  • a stator core 30 forms part of a stator assembly which is disposed opposite to the rotor 51 through a predetermined gap.
  • the stator core 30 has both axial ends held by end cramps 31 , and fixed to the stator frame 60 .
  • Armature windings 10 , 20 are stored in each of a plurality of slots which extend in the axial direction of the stator core 30 , and are disposed in the circumferential direction at predetermined intervals.
  • a cooling water inlet passage 61 is provided at axial ends of the armature windings 10 , 20 , while a cooling water outlet passage 62 is provided on the opposite ends of the same, such that cooling water is passed in the axial direction through the hollow strands 11 , 14 and the like, as illustrated in FIG. 3 , which form part of the armature windings 10 , 20 , to directly cool the armature windings 10 , 20 .
  • the armature windings 10 , 20 each have a group of strands arranged, for example, in n rows and m columns, which is covered with a main insulator 4 .
  • the main insulator 4 is a structure for maintaining electric insulation between the inside and the outside of the winding, and is often made of mica or resin.
  • strands are transposed every two rows to form a strand group.
  • strands are divided into groups 1 , 2 of strands which are transposed every two row, as illustrated in FIG. 20 . The same is applied as well to six columns or more.
  • FIG. 2 illustrates an armature winding according to a first embodiment of the present invention.
  • a strand group 2 which forms part of the armature winding 10 covered with the main insulator, includes strands 21 , 22 , 2 n , the cross-sectional area of which is chosen to be smaller than the cross-sectional area of strands 11 , 12 , . . . , 1 n of a strand group 1 , whereby the strand group 2 has a larger flow resistance of current than the strand group 1 .
  • the effects and principles of the foregoing will be discussed below.
  • a general armature winding is comprised of a strand group 1 made up of two rows of strands 11 , 12 , . . . , 1 n , 1(n+1), . . . , 1( 2 n ), and a strand group 2 likewise made up of two rows of strands 21 , 22 , . . . , 2 n , 2(n+1), . . . , 2( 2 n ).
  • the strand group 1 has the same cross-sectional shape as the second strand group 2 .
  • the strands in the strand group 1 and strand group 2 are transposed through a transpose angle of 360°, 540° or the like, respectively, so as to cancel out magnetic fields which interlink within the stator core 30 .
  • the manner in which the strands are transposed has been shown in FIG. 20 .
  • strands are transposed two rows by two rows, as illustrated in FIG. 20 , however, no strands are transposed between the strand group 1 and strand group 2 , so that a radial magnetic flux ⁇ r2 acts between the strand groups.
  • the strands are transposed only within the stator core, and are not transposed in end portions. Both strand groups are connected to each other at extreme ends.
  • representative strands 11 , 15 , 21 , 25 are selected from the respective strand groups for the following description.
  • the transpose angle is chosen to be 540° by way of example. As illustrated in FIGS.
  • strands belonging to the strand group 1 are transposed such that the flux linkage is annihilated within a slot, so that no circulating current is induced between the strands 11 , 15 by magnetic fields such as ⁇ r2, ⁇ t2 and the like.
  • magnetic fields around the end I and end II since the strands 11 , 15 change places in vertical relationship, a circumferential magnetic flux ⁇ t1 at the end I and a circumferential magnetic flux ⁇ t3 at the end II act on the strands 11 , 15 in opposite polarities.
  • the magnetic fields vary depending on radial positions, the flux linkages are not completely canceled out, but a slight circulating current flows. This applies to the strands 21 , 25 of the strand group 2 as well.
  • FIG. 12 illustrates a circuit diagram of strand currents, where a current I 0 is calculated by dividing a current I of the overall armature winding by the number of strands, and represents an average current of the strands, and I 1 to I 3 represent circulating currents which are generated by magnetic fluxes that link to respective closed loops.
  • the circumferential magnetic fluxes ⁇ t1 ⁇ t3 link between the strands 11 and 15 and between the strands 21 and 25 , respectively, to induce the circulating currents I 1 , I 2 which flow in a direction in which they cancel out the magnetic fluxes.
  • the radial magnetic fluxes ⁇ r1 to ⁇ r3 link between the strand group 1 and strand group 2 , i.e., between the strands 11 , 15 and between strands 21 , 25 to induce the current I 3 which flows in a direction in which it cancels out the magnetic fluxes.
  • a strand current distribution in the conventional structure may be represented by FIGS. 14A, 14B .
  • the strand group 1 through which a large strand current flows, generates larger heat, while the strand group 2 generates smaller heat.
  • larger heat is generated in an upper and a lower portion of the winding from the relation between the positions of strands and the linkage flux at the ends. For this reason, a current distribution is produced as illustrated in FIG. 13 even when there is only one strand group, resulting in non-uniform temperature.
  • the strand group 2 has a smaller flow resistance of current than the strand group 1 .
  • the circulating current I 3 can be reduced.
  • the smaller I 3 can contribute to a reduction in I 11 , I 15 , as shown by Equation (1), resulting in a reduction in heat generated by the strand group 1 .
  • the current is reduced as the resistance is increased, however, heat generated thereby tends to increase because the flow resistance of current is larger.
  • the temperature within the cross-section can be maintained uniform by an increase in the heat generated by the strand group 2 and a reduction in the heat generated by the strand group 1 .
  • the flow resistance of current is increased by uniformly reducing the width of all the strands within the strand group 2 , but the present invention is not limited to this particular way. Instead, the flow resistance of current may be varied, for example, by changing the material, or by changing the height of the strands, the shape of the strands, and the number of tiers, as a matter of course.
  • FIG. 3 illustrates an armature winding according to a second embodiment of the present invention.
  • the second embodiment illustrates an application to a water-cooled winding.
  • the flow resistance of current is varied by uniformly reducing the width of all the strands (cross-sectional area of the strands) within the strand group 2 than the width of the strands (cross-sectional area of the strands) within the strand group 1 .
  • a closed loop formed by the strand 11 and the like within the strand group 1 and the strand 21 and the like within the strand group 2 has a larger flow resistance of current, so that a circulating current which flows through the closed loop can be reduced.
  • the current density of the strand group 1 can be made equivalent to that of the strand group 2 , resulting in uniform heat generation as well.
  • the strands 11 , 14 , 21 , 24 , and the like are in hollow structure for passing cooling water therethrough, where the strands 21 , 24 and the like have a smaller water pass area than the strands 11 , 14 , making it possible to further uniformalize the temperature because an appropriate amount of water can be taken in accordance with generated heat.
  • FIG. 4 illustrates an armature winding according to a third embodiment of the present invention.
  • the third embodiment shows an example which has armature windings 10 , 20 (hereinafter called the “top coil 20 ” and “bottom coil 10 ”), in the structure described in the second embodiment, piled two high within a slot 40 .
  • the width of strands 121 , 122 , and the like (cross-sectional area of the strands) belonging to a strand group 102 of the bottom coil 10 is set smaller than the width of strands 111 , 112 , and the like (cross-sectional area of the strands) belonging to a strand group 101 .
  • the width of strands 221 , 222 , and the like (cross-sectional area of the strands) belonging to a strand group 202 is set smaller than the width of strands 211 , 212 , and the like of a strand group 201 .
  • the strands having a larger resistance are placed on the same side in regard to the horizontal direction of the slot in both the top coil 20 and bottom coil 10 . This is effective when a current flowing through the top coil 20 has the same polarity as a current flowing through the bottom coil 10 so that radial magnetic fluxes having the same polarity act on the coils.
  • FIG. 5 illustrates an armature winding according to a fourth embodiment of the present invention.
  • the fourth embodiment shows an example which has armature windings 110 , 220 (hereinafter called the “top coil 220 ” and “bottom coil 110 ”) placed in a slot 40 , in which the structure described in the first embodiment is applied to a water-cooled windings.
  • the width of strands 121 , 122 , and the like (cross-sectional area of the strands) belonging to a strand group 102 of the bottom coil 110 is smaller than the width of the strands 111 , 112 , and the like (cross-sectional area of the strands) belonging to a strand group 101 .
  • the width of strands 211 , 212 , and the like (cross-sectional area of the strands) belonging to a strand group 201 is smaller than the width of strands 221 , 222 , and the like belonging to a strand group 202 .
  • the strands having a larger resistance are placed on the opposite sides in regard to the horizontal direction of the slot 40 in the top coil 220 and bottom coil 110 .
  • This structure is effective when a current flowing through the top coil 220 is opposite in polarity to a current flowing through the bottom coil 110 , and radial magnetic fluxes acting on the top coil 220 and bottom coil 110 have the same polarity, or when a current flowing through the top coil 220 has the same polarity as a current flowing through the bottom coil 110 , and acting radial magnetic fluxes have the opposite polarities.
  • FIG. 6 illustrates an armature winding according to a fifth embodiment of the present invention.
  • hollow strands 21 , 24 , and the like are placed only in an upper portion and a lower portion of a strand group 2
  • a strand group 1 is similar in structure to the second embodiment (see FIG. 3 ).
  • a smaller amount of cooling water can be provided to the strand group 2 which generates a reduced amount of heat, so that effective cooling can be accomplished as appropriate to a particular amount of generated heat.
  • FIGS. 14A, 14B since larger heat is generated in the upper portion and lower portion of the strand group 2 , as illustrated in FIGS. 14A, 14B , these portions can be intensively cooled in the structure of this embodiment, thereby improving the cooling efficiency.
  • FIG. 7 illustrates an armature winding according to a sixth embodiment of the present invention.
  • This embodiment shows an exemplary application to an armature winding which uses 6 -row strands, and comprises three strand groups 1 , 2 , 3 .
  • the width of strands (cross-sectional area of the strands) belonging to the strand group 2 is smaller than the width of strands (cross-sectional area of the strands) belonging to the first strand group 1
  • the width of strands (cross-sectional area of the strands) belonging to the strand group 3 is smaller than the width of the strands (cross-sectional area of the strands) belonging to the strand group 2 .
  • FIG. 8 illustrates an armature winding according to an eighth embodiment of the present invention.
  • This embodiment shows an exemplary application to an armature winding comprised of a single strand group, and illustrates an exemplary arrangement of strands at an end.
  • the heat generation density is higher in an upper portion and a lower portion of a winding due to the influence of circulating currents, as illustrated in FIGS. 13A, 13B .
  • the cross-sectional area of strands 11 , 12 , and the like in an upper portion and a strand in and the like in a lower portion, in which a larger amount of heat is generated is smaller than the cross-sectional area of the remaining (central) strands.
  • the flow resistances of currents passing through the strands in the upper and lower portions are set larger than the flow resistances of currents passing through central strands.
  • FIG. 9 illustrates an armature winding according to an eighth embodiment of the present invention.
  • This embodiment shows an exemplary application to an armature winding comprised of a single strand group, wherein hollow strands 11 , 14 , and the like for water cooling are intensively arranged in an upper portion and a lower portion, in which the heat generation density is higher, to more strongly cool the upper and lower portions of the winding.
  • the upper and lower portions of the winding in which a larger amount of heat is generated, can be cooled in an intensive way to improve the cooling efficiency and uniformalize the temperature.
  • FIG. 10 illustrates an armature winding according to a ninth embodiment of the present invention.
  • This embodiment which is created from a viewpoint different from the eighth embodiment, intensively arranges hollow strands 11 , 12 , and the like only in an upper portion of a winding. With a strand transposition through 360°, the circulating current typically becomes largest on the upper side of armature windings 10 , 20 , so that this embodiment can intensively cool this portion to uniformalize the temperature.
  • the circulating currents within the winding are reduced to eliminate locally heated portions, thereby making it possible to uniformly increase the temperature of the armature and reduce the increase in temperature.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Windings For Motors And Generators (AREA)
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JP2003398331A JP2005160261A (ja) 2003-11-28 2003-11-28 電機子巻線及びそれを用いた回転電機

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US20140159518A1 (en) * 2012-12-11 2014-06-12 Alstom Technology Ltd. Stator winding of a directly cooled turbogenerator
US20160036277A1 (en) * 2014-08-04 2016-02-04 Hamilton Sundstrand Corporation Strand cross-section for high fill-factor electric machine windings
US10673293B2 (en) 2017-11-14 2020-06-02 Borgwarner Inc. Electric machine with variable cross section stator windings
WO2020141054A1 (de) * 2019-01-04 2020-07-09 Rolls-Royce Deutschland Ltd & Co Kg Luftspule für einen multilevelkonverter
US11165298B2 (en) 2019-03-12 2021-11-02 Borgwarner Inc. Electric machine with solid and stranded conductors

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JP5060104B2 (ja) * 2006-11-10 2012-10-31 株式会社東芝 回転電機の電機子巻線及び回転電機の固定子並びに回転電機
US7876016B2 (en) * 2007-11-15 2011-01-25 Sundyne Corporation Stator winding method and apparatus
JP2009131041A (ja) * 2007-11-22 2009-06-11 Toshiba Corp 発電機の固定子
EP2629401B1 (en) * 2012-02-20 2015-02-11 ALSTOM Renewable Technologies Generator
CN102904384A (zh) * 2012-11-15 2013-01-30 哈尔滨电机厂有限责任公司 气体冷却发电机
CN103545023A (zh) * 2013-10-29 2014-01-29 哈尔滨工业大学 内冷式换位利兹导线组
CN103532346B (zh) * 2013-10-31 2016-11-02 中国船舶重工集团公司第七一二研究所 一种气隙电枢电机
CN103578624A (zh) * 2013-11-07 2014-02-12 天津经纬电材股份有限公司 带冷却通道的扁形换位铝导线
JP6578267B2 (ja) * 2016-11-02 2019-09-18 日立ジョンソンコントロールズ空調株式会社 永久磁石式回転電動機、および、これを用いた圧縮機
EP3340437A1 (en) * 2016-12-23 2018-06-27 Siemens Aktiengesellschaft Nanofluid cooled electrical machine
JP7263737B2 (ja) * 2018-10-30 2023-04-25 株式会社デンソー 回転電機

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CN1937359A (zh) 2007-03-28
TWI281770B (en) 2007-05-21
EP1548913A3 (en) 2008-03-05
EP1548913A2 (en) 2005-06-29
CN1622427A (zh) 2005-06-01
US20060028086A1 (en) 2006-02-09
JP2005160261A (ja) 2005-06-16
TW200527799A (en) 2005-08-16
CN1937359B (zh) 2011-06-22
US7368842B2 (en) 2008-05-06
KR20050052392A (ko) 2005-06-02
KR101044420B1 (ko) 2011-06-27

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