WO2016171079A1 - Rotor pour machine électrique tournante, et machine électrique tournante - Google Patents

Rotor pour machine électrique tournante, et machine électrique tournante Download PDF

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Publication number
WO2016171079A1
WO2016171079A1 PCT/JP2016/062110 JP2016062110W WO2016171079A1 WO 2016171079 A1 WO2016171079 A1 WO 2016171079A1 JP 2016062110 W JP2016062110 W JP 2016062110W WO 2016171079 A1 WO2016171079 A1 WO 2016171079A1
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WO
WIPO (PCT)
Prior art keywords
rotor
coil
radial
rotor coil
cooling gas
Prior art date
Application number
PCT/JP2016/062110
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English (en)
Japanese (ja)
Inventor
メッサウディ　ブラヒム
哲也 永安
Original Assignee
三菱電機株式会社
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Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Publication of WO2016171079A1 publication Critical patent/WO2016171079A1/fr

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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
    • H02K3/24—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
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation

Definitions

  • the present invention relates to a rotor of a rotating electric machine applied to a turbine generator and the like and a rotating electric machine equipped with the rotor.
  • the rotor iron core is provided with a plurality of coil slots in the circumferential direction, and a plurality of rotor coils are laminated in each of these coil slots, It is fixed by a wedge through an insulator.
  • a turn insulator is inserted to insulate the rotor coils from each other, and a slot insulator is inserted to insulate the rotor coil and the coil slot.
  • a sub-slot is provided over the entire length in the axial direction, and the sub-slot and a plurality of radial paths which are ventilation holes penetrating the rotor coil in the radial direction are provided.
  • a cooling gas flow path is formed by communicating. At this time, the cooling gas is introduced into the subslot from the axial end of the rotor core, and is sequentially branched into a radial path by the centrifugal fan effect due to the rotation of the rotor, and after absorbing the heat generated in the rotor coil, It is discharged into the air gap.
  • the insulator of the rotor coil has an allowable heat-resistant temperature, or the amount of heat generation increases due to an increase in the electrical resistance of the rotor coil itself due to the temperature rise. It is necessary to keep it as low as possible. Further, in recent years, the capacity of generators has been increased, and in order to increase the single machine capacity, it is required to flow as much field current as possible with the same rotor diameter.
  • the branch from the subslot to each radial path changes depending on the pressure loss when the cooling gas branches. This pressure loss changes depending on the flow rate in the subslot, which is the main flow, and the flow rate in the radial path, which is the tributary flow, and the pressure loss increases as the difference increases.
  • the flow rate in the radial path is small, and the flow rate in the sub-slot decreases toward the axial center of the rotor core. As a result, a temperature difference occurs in the axial direction of the rotor coil.
  • the rotor coil housed in the coil slot on the outer periphery of the cylindrical rotor core, and the axial direction of the rotor core A sub-slot that feeds cooling gas to the bottom of the slot and a plurality of radial paths that penetrate the rotor coil in the radial direction.
  • the cooling gas is introduced into the sub-slot from the end of the rotor core, and the rotor A rotor of a rotating electrical machine that branches into a radial path of the coil to cool the rotor coil, and the rotor coil has a ventilation hole and a shaft that are obliquely opened in the circumferential direction when viewed in a direction perpendicular to the rotation axis
  • a radial path is formed by ventilation holes opened obliquely in the direction, or ventilation holes opened obliquely in the circumferential direction and the axial direction (see, for example, Patent Document 1).
  • the prior art has the following problems. That is, in the rotor of the rotating electrical machine described in Patent Document 1, the rotor coil is provided with the ventilation holes obliquely when viewed in the direction orthogonal to the rotational axis, so that the pressure loss in the cooling gas flow path is reduced. Since it increases and the total air volume of the cooling gas decreases, the temperature rises from the subslot toward the air gap, and the average temperature of the rotor coil also rises, causing a problem that the coil temperature becomes non-uniform.
  • the present invention has been made to solve the above-described problems, and provides a rotor for a rotating electrical machine capable of efficiently and uniformly cooling a rotor coil and allowing a larger field current to flow. For the purpose.
  • a rotor of a rotating electrical machine includes a plurality of stages of rotor coils housed in a coil slot on an outer peripheral portion of a cylindrical rotor core, and a hole in the axial direction of the rotor core.
  • the cooling gas is introduced into the subslot from the axial end of the rotor core, and the rotor coil
  • a rotor of a rotating electrical machine that cools the rotor coil by branching to a radial path of the rotor, further comprising a turn insulator that insulates the plurality of rotor coils from each other, and the turn insulator is a step of the rotor coil.
  • Each has a protruding portion that protrudes alternately from a different direction toward the radial path.
  • the turn insulator that insulates the rotor coils of the plurality of stages from each other is protruded toward the radial path from different directions alternately for each stage of the rotor coil. Has a part. Therefore, it is possible to obtain a rotor of a rotating electrical machine capable of efficiently and uniformly cooling the rotor coil and allowing a larger field current to flow.
  • FIG. 1 is a cross-sectional view showing a radial flow cooling type cooling circuit to which a rotor of a rotating electrical machine according to Embodiment 1 of the present invention is applied.
  • FIG. 1 shows a cross-sectional view of the cooling circuit cut in the axial direction of the rotating electrical machine.
  • the fan 2 installed on the shaft 1 of the rotating electrical machine rotates together with the shaft 1, so that the low-temperature cooling gas is provided in the subslot provided between the rotor 3 and the shaft 1. 4 flows from the axial end of the rotor core.
  • cooling gas flowing into the subslot 4 is branched into a radial path 5 which is a ventilation hole installed in the axial direction of the rotor 3 and passes through a cooling gas flow path of a stator coil which will be described later. And cool them in direct contact with the turn insulator.
  • the cooling gas passes through the wedge that is the upper part of the rotor 3, passes through the air gap 7 between the rotor 3 and the stator 6, and then flows into the high-temperature cooling gas circuit 8 of the stator 6. Then, cooling is performed indirectly through an insulator such as mica.
  • the cooling gas that has passed through the stator 6 flows into a gas cooler 9 that is a gas cooler and is cooled. Then, the cooling gas becomes a low-temperature cooling gas and flows in the direction of the low-temperature cooling gas circuit 10 to circulate in the rotating electrical machine. .
  • FIG. 2 is a cross-sectional view of the rotor of the rotating electrical machine according to the first embodiment of the present invention as viewed from the axial direction.
  • FIG. 2 two of the coil slots provided in the circumferential direction on the outer periphery of the rotor are shown.
  • a plurality of rotor coils 11 are stacked and housed in each coil slot, and the rotor coils 11 are insulated from each other by a turn insulator 12.
  • the rotor coil 11 is fixed by a wedge 14 via an insulator 13.
  • a sub-slot 4 is formed at the bottom of the coil slot in which the rotor coil 11 is mounted over the entire axial length of the stator core, and a plurality of sub-slots 4 and the rotor coil 11 are penetrated in the radial direction.
  • a cooling gas flow path is formed by communicating with the radial path 5.
  • FIG. 3 is a partial cross-sectional view showing an extracted rotor coil in the rotor of the rotating electrical machine according to the first embodiment of the present invention.
  • FIG. 4 is a plan view of the rotor coil shown in FIG. 3 as seen from the outside of the rotor coil.
  • FIG. 3 is an enlarged view of the broken line portion of FIG.
  • the turn insulator 12 that insulates the rotor coils 11 of a plurality of stages from each other includes protrusions 15 that protrude from the different directions toward the radial path 5 at each stage of the rotor coil 11.
  • the protrusion part 15 is comprised by protrusion, a rib, etc.
  • the radial path 5 is formed in a zigzag shape by appropriately laminating the rotor coil 11 and the turn insulator 12 formed with the protrusion 15.
  • the cooling gas flow path is formed.
  • the radial path 5 formed by laminating the rotor coil 11 and the turn insulator 12 formed with the protrusion 15 gives a zigzag flow to the cooling gas branched from the subslot 4. Moreover, since the protrusion part 15 protrudes toward the radial path 5 from a different direction for every stage of the rotor coil 11, the turbulent flow of the cooling gas is promoted.
  • the protrusions 15 protrude from the different directions alternately toward the radial path 5 for each stage of the rotor coil 11, the protrusions 15 simultaneously protrude from the different directions toward the radial path 5.
  • the temperature of the rotor coil 11 can be kept low while suppressing an increase in pressure loss as compared with the above.
  • the residence time of the cooling gas is longer than that of the rotor coil described in Patent Document 1, as viewed in the direction orthogonal to the rotation axis, as compared with the case where the ventilation holes are opened obliquely, Since the contact time with the cooling inner surface of the rotor coil 11 becomes longer, heat transfer is promoted and the temperature of the rotor coil 11 can be kept low.
  • the turn insulator that insulates the rotor coils of the plurality of stages from each other is protruded toward the radial path from different directions alternately for each stage of the rotor coils. Has a part. Therefore, it is possible to obtain a rotor of a rotating electrical machine capable of efficiently and uniformly cooling the rotor coil and allowing a larger field current to flow.
  • FIG. FIG. 5 is a partial cross-sectional view showing an extracted rotor coil in a rotor of a rotating electrical machine according to Embodiment 2 of the present invention.
  • FIG. 6 is a plan view of the rotor coil shown in FIG. 5 viewed from the outside of the rotor coil.
  • FIG. 5 is an enlarged view of the broken line portion of FIG.
  • the turn insulator 12 that insulates the rotor coils 11 of a plurality of stages from each other has protrusions 15 protruding toward the radial path 5 from different directions alternately for each stage of the rotor coil 11.
  • the protrusion part 15 is comprised by protrusion, a rib, etc.
  • the turn insulator 12 has a recess 16 provided on the side facing the protruding portion 15 with the radial path 5 interposed therebetween.
  • the radial path 5 is obtained by appropriately laminating the rotor coil 11 and the turn insulator 12 in which the protrusion 15 and the recess 16 are formed.
  • a zigzag-shaped cooling gas flow path is formed.
  • the radial path 5 formed by laminating the rotor coil 11 and the turn insulator 12 in which the protrusion 15 and the depression 16 are formed causes the cooling gas branched from the subslot 4 to flow in a zigzag shape.
  • the protrusions 15 protrude toward the radial path 5 from different directions alternately for each stage of the rotor coil 11, and the recess 16 is provided on the side facing the protrusion 15, the cooling gas is disturbed. Streamlining is promoted.
  • the residence time of the cooling gas is longer than that of the rotor coil described in Patent Document 1, as compared with the rotor coil that is obliquely opened in the direction orthogonal to the rotation axis, Since the contact time with the cooling inner surface of the rotor coil 11 becomes longer, heat transfer is promoted and the temperature of the rotor coil 11 can be kept low.
  • the turn insulator that insulates the plurality of stages of rotor coils from each other is protruded toward the radial path alternately from different directions for each stage of the rotor coils. And a recess provided on the side facing the protruding portion across the radial path. Therefore, it is possible to obtain a rotor of a rotating electrical machine capable of efficiently and uniformly cooling the rotor coil and allowing a larger field current to flow.
  • FIG. 7 is a partial cross-sectional view showing an extracted rotor coil in a rotor of a rotating electrical machine according to Embodiment 3 of the present invention.
  • FIG. 8 is a plan view of the rotor coil shown in FIG. 7 viewed from the outside of the rotor coil.
  • FIG. 7 is an enlarged view of the broken line portion of FIG.
  • the turn insulator 12 that insulates the rotor coils 11 of the plurality of stages from each other includes protrusions 15 that protrude from the different directions toward the radial path 5 alternately for each stage of the rotor coil 11.
  • the protrusion 15 is formed in a comb shape when the rotor coil 11 is viewed from the outside in the radial direction.
  • the protrusion part 15 is comprised by protrusion, a rib, etc.
  • the radial path 5 is formed in a zigzag shape by appropriately laminating the rotor coil 11 and the turn insulator 12 on which the protrusion 15 is formed.
  • the cooling gas flow path is formed.
  • the radial path 5 formed by laminating the rotor coil 11 and the turn insulator 12 formed with the protrusion 15 gives a zigzag flow to the cooling gas branched from the subslot 4. Moreover, since the protrusion 15 protrudes toward the radial path 5 from different directions alternately for each stage of the rotor coil 11 and is formed in a comb shape, the turbulent flow of the cooling gas is promoted. .
  • the residence time of the cooling gas is longer than that of the rotor coil described in Patent Document 1, as compared with the rotor coil that is obliquely opened in the direction orthogonal to the rotation axis, Since the contact time with the cooling inner surface of the rotor coil 11 becomes longer, heat transfer is promoted and the temperature of the rotor coil 11 can be kept low.
  • the turn insulator that insulates the rotor coils of the plurality of stages from each other is protruded toward the radial path from different directions alternately for each stage of the rotor coils.
  • the protrusion is formed in a comb-like shape. Therefore, it is possible to obtain a rotor of a rotating electrical machine capable of efficiently and uniformly cooling the rotor coil and allowing a larger field current to flow.
  • FIG. 9 is a partial cross-sectional view showing an extracted rotor coil in a rotor of a rotating electrical machine according to Embodiment 4 of the present invention.
  • FIG. 10 is a plan view of the rotor coil shown in FIG. 9 viewed from the outside of the rotor coil.
  • FIG. 9 is an enlarged view of the broken line portion of FIG.
  • the turn insulator 12 that insulates the rotor coils 11 of a plurality of stages from each other includes protrusions 15 that protrude from the different directions toward the radial path 5 for each stage of the rotor coil 11.
  • the protrusion part 15 is comprised by protrusion, a rib, etc.
  • the radial path 5 is formed in a zigzag shape by appropriately laminating the rotor coil 11 and the turn insulator 12 on which the protrusion 15 is formed.
  • the cooling gas flow path is formed.
  • the protruding amount of the protruding portion 15 is configured to change along the axial direction of the rotor core.
  • the amount of protrusion of the protrusion 15 of the radial path 5 at the axial end of the rotor core is the amount of protrusion of the protrusion 15 of the radial path 5 at the axial center of the rotor core. It is larger than the amount.
  • the protrusion amount of the protrusion 15 is determined by the following equation (1), for example.
  • Hmax indicates the amount of protrusion of the protrusion 15 of the radial path 5 at the cooling gas inlet (the axial end of the rotor core) of the subslot 4
  • Hmin indicates the center of the subslot 4.
  • the projecting amount of the projecting portion 15 of the radial path 5 at the axial center of the rotor core is indicated
  • L0 indicates the overall length of the subslot 4 in the axial direction
  • X is the radial as viewed from the inlet of the subslot 4
  • the position of pass 5 is shown.
  • FIG. 11 is a curve diagram showing the relationship between the protruding amount of the protruding portion 15 according to Embodiment 4 of the present invention and the position of the radial path 5 as viewed from the inlet of the subslot 4.
  • the radial path 5 formed by laminating the rotor coil 11 and the turn insulator 12 formed with the protrusion 15 gives a zigzag flow to the cooling gas branched from the subslot 4. Moreover, since the protrusion part 15 protrudes toward the radial path 5 from a different direction for every stage of the rotor coil 11, the turbulent flow of the cooling gas is promoted.
  • the residence time of the cooling gas is longer than that of the rotor coil described in Patent Document 1, as compared with the rotor coil that is obliquely opened in the direction orthogonal to the rotation axis, Since the contact time with the cooling inner surface of the rotor coil 11 becomes longer, heat transfer is promoted and the temperature of the rotor coil 11 can be kept low.
  • the cooling gas flowing into the subslot 4 from the axial end portion of the rotor core increases in pressure loss from the axial end portion of the rotor core toward the axial center portion of the rotor core. It is thought that gas becomes difficult to flow.
  • the cooling gas is allowed to flow evenly through the subslot 4 to suppress pressure loss, and the rotor core shaft Even in the central portion in the direction, a sufficient air volume can be secured.
  • the protrusion amount of the radial path protrusion at the axial end portion of the rotor core is the protrusion of the radial path at the axial center portion of the rotor core. It is larger than the protruding amount of the part. Therefore, it is possible to obtain a rotor of a rotating electrical machine capable of efficiently and uniformly cooling the rotor coil and allowing a larger field current to flow.
  • FIG. 12 is a cross-sectional view showing a rotor of a rotary electric machine according to Embodiment 5 of the present invention.
  • the sub-slot 4 is formed with a tapered flow path 17 having a cross-sectional area that increases from the axial end of the rotor core toward the axial center of the rotor core.
  • FIG. 12 other configurations are the same as those in FIG. 1 described in Embodiment 1, and thus description thereof is omitted.
  • the configuration of the rotor coil 11 and the like are the same as those in the first embodiment described above, and thus description thereof is omitted.
  • the pressure loss is expressed by the following equation (2).
  • equation (2) refers to “http://www.codecogs.com/library/engineering/fluid_mechanics/pipes/head_loss/tapered-pipe.php”.
  • f represents the coefficient of friction
  • l represents the length of the taper pipe (half the length of the subslot 4)
  • d 1 represents the hydraulic force on the divergent or spreading side of the taper pipe.
  • the diameter (maximum diameter) is indicated
  • d 2 indicates the convergent or narrowed hydraulic diameter (minimum diameter) of the tapered pipe
  • v 1 indicates the linear velocity on the gas inflow side
  • X indicates d 1 / d 2 .
  • a ratio of h f / h 0 f is set, and thereby the relationship between d 1 and d 2 is determined.
  • the shape of the slot 4 may be changed.
  • the radial path 5 is obtained by appropriately laminating the rotor coil 11 and the turn insulator 12 on which the protrusion 15 is formed.
  • a zigzag shaped cooling gas flow path is formed.
  • the radial path 5 formed by laminating the rotor coil 11 and the turn insulator 12 formed with the protrusion 15 gives a zigzag flow to the cooling gas branched from the subslot 4. Moreover, since the protrusion part 15 protrudes toward the radial path 5 from a different direction for every stage of the rotor coil 11, the turbulent flow of the cooling gas is promoted.
  • the residence time of the cooling gas is longer than that of the rotor coil described in Patent Document 1, as compared with the rotor coil that is obliquely opened in the direction orthogonal to the rotation axis, Since the contact time with the cooling inner surface of the rotor coil 11 becomes longer, heat transfer is promoted and the temperature of the rotor coil 11 can be kept low.
  • the cooling gas flowing into the subslot 4 from the axial end portion of the rotor core increases in pressure loss from the axial end portion of the rotor core toward the axial center portion of the rotor core. It is thought that gas becomes difficult to flow.
  • the cooling gas is allowed to flow evenly in the subslot 4 to suppress pressure loss, and even in the axially central portion of the rotor core, sufficient A large air volume can be secured.
  • the tapered flow path whose cross-sectional area increases from the axial end portion of the rotor core toward the axial center portion of the rotor core is formed. Yes. Therefore, it is possible to obtain a rotor of a rotating electrical machine capable of efficiently and uniformly cooling the rotor coil and allowing a larger field current to flow.
  • the tapered flow path 17 is formed on the upper and lower surfaces in the subslot 4 .
  • the present invention is not limited to this, and the tapered flow path is formed only on the upper and lower surfaces in the subslot 4. Even in this case, the same effect can be obtained.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Windings For Motors And Generators (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

L'objectif de la présente invention est de pourvoir à un rotor pour machine électrique tournante avec lequel une bobine de rotor peut être refroidie efficacement et uniformément, ce qui permet la circulation d'un plus fort courant magnétique. Ce rotor pour machine électrique tournante est équipé de multiples étages de bobines de rotor logées dans des encoches pour bobine sur la partie circonférentielle extérieure d'un noyau de rotor cylindrique, d'une sous-encoche ménagée dans la direction axiale du noyau de rotor et amenant un gaz de refroidissement au fond des encoches pour bobine, et de multiples chemins radiaux pénétrant dans la bobine de rotor dans la direction radiale, le gaz de refroidissement étant introduit dans la sous-encoche à partir d'une partie d'extrémité axiale du noyau de rotor et divergeant dans les chemins radiaux de la bobine de rotor, ce qui permet de refroidir la bobine de rotor. Ce rotor pour machine électrique tournante est en outre équipé d'un matériau d'isolation de spires destiné à isoler les multiples étages de bobines de rotor les uns des autres, et le matériau d'isolation de spires présente des parties saillantes qui, pour chaque étage de bobine de rotor, font saillie vers le chemin radial alternativement dans des sens différents.
PCT/JP2016/062110 2015-04-23 2016-04-15 Rotor pour machine électrique tournante, et machine électrique tournante WO2016171079A1 (fr)

Applications Claiming Priority (2)

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JP2015-088261 2015-04-23
JP2015088261A JP2018102018A (ja) 2015-04-23 2015-04-23 回転電機の回転子

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WO2016171079A1 true WO2016171079A1 (fr) 2016-10-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113824230A (zh) * 2021-08-09 2021-12-21 东方电气集团东方电机有限公司 一种发电机转子冷却结构及其使用方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6958504B2 (ja) * 2018-07-25 2021-11-02 株式会社デンソー 回転電機の固定子

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01144338A (ja) * 1987-11-30 1989-06-06 Toshiba Corp 回転電機のコイル
JPH08317580A (ja) * 1995-05-15 1996-11-29 Hitachi Ltd 回転電機の回転子
US5685063A (en) * 1994-11-04 1997-11-11 General Electric Company Method of forming rotor-winding for a dynamoelectric machine
JP2001086679A (ja) * 1999-09-17 2001-03-30 Hitachi Ltd 回転電機
JP2004312886A (ja) * 2003-04-08 2004-11-04 Suzuki Motor Corp 電動機の冷却構造
JP2014060899A (ja) * 2012-09-19 2014-04-03 Fuji Electric Co Ltd 回転電機の回転子巻線絶縁構造
JP2014140276A (ja) * 2013-01-21 2014-07-31 Mitsubishi Electric Corp 液冷式回転電機
JP2014225987A (ja) * 2013-05-16 2014-12-04 株式会社豊田自動織機 回転電機

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01144338A (ja) * 1987-11-30 1989-06-06 Toshiba Corp 回転電機のコイル
US5685063A (en) * 1994-11-04 1997-11-11 General Electric Company Method of forming rotor-winding for a dynamoelectric machine
JPH08317580A (ja) * 1995-05-15 1996-11-29 Hitachi Ltd 回転電機の回転子
JP2001086679A (ja) * 1999-09-17 2001-03-30 Hitachi Ltd 回転電機
JP2004312886A (ja) * 2003-04-08 2004-11-04 Suzuki Motor Corp 電動機の冷却構造
JP2014060899A (ja) * 2012-09-19 2014-04-03 Fuji Electric Co Ltd 回転電機の回転子巻線絶縁構造
JP2014140276A (ja) * 2013-01-21 2014-07-31 Mitsubishi Electric Corp 液冷式回転電機
JP2014225987A (ja) * 2013-05-16 2014-12-04 株式会社豊田自動織機 回転電機

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113824230A (zh) * 2021-08-09 2021-12-21 东方电气集团东方电机有限公司 一种发电机转子冷却结构及其使用方法

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