CA1048582A - Gas-cooled rotor winding for dynamo-electric machine - Google Patents
Gas-cooled rotor winding for dynamo-electric machineInfo
- Publication number
- CA1048582A CA1048582A CA76245617A CA245617A CA1048582A CA 1048582 A CA1048582 A CA 1048582A CA 76245617 A CA76245617 A CA 76245617A CA 245617 A CA245617 A CA 245617A CA 1048582 A CA1048582 A CA 1048582A
- Authority
- CA
- Canada
- Prior art keywords
- inlet
- outlet
- rotor
- conductor plate
- conductor
- 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.)
- Expired
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- Motor Or Generator Cooling System (AREA)
- Windings For Motors And Generators (AREA)
Abstract
Abstract of the Disclosure A rotary electric machine comprises a rotor and a stator in which a rotor winding is cooled by a cooling gas. The rotor winding has a plurality of conductor plates insulated from each other and superposed within a respective slot formed in the rotor. The conductor plate has inlet and outlet holes alternately arranged in two rows in a longitudinal direction of the rotor and diagonal grooves connecting the inlet and outlet holes in one row to the outlet and inlet holes, respectively, in the other row. The inlet and outlet holes in one conductor plate are in alignment with the inlet and outlet holes in the remaining conductor plates to provide gas inlet passages and gas outlet passages. The rotor has wedges for fixing the rotor winding in the slot and each having inlets and outlets corresponding to the inlet and outlet holes in the conductor plates. A cooling gas is introduced into the inlet in the rotor and exhausted from the outlet of the rotor through the inlet hole, diagonal groove and outlet hole.
Description
104~582 This invention relates to a rotary electric machine having a cooling structure and in particular to a rotary electric machine in which a rotor winding of the rotor is cooled.
A conventional rotary electric machine such as a turbine generator is cooled by introducir.g a cooling medium such as cooling gas into slots in which a rotor winding is disposed and bringing it into direct contact with the rotor winding. The rotor winding conductor plates superposed within the slot have gas inlet and outlet cutouts alternately formed on each side portion and in the direction of the conductor plate and diagonal grooves connecting the inlet and outlet cutouts to each other. A cooling gas introduced from the gas inlet cutout is passed through the diagonal groove to cool the conductor plate and exhausted from the gas outlet_cutouts. In the rotary electric machine of this type, however, the cooling gas introduced into the gas inlet cutout is leaked from a clearance between the conductor plate and an insulating plate surrounding he conductor plate. ~s a resulf, the gzs enters direct ~nto the neighboring outlet cutout and is exhausted to the outside without contributing to cooling of the rotor winding. For this reason, an effective amount of gas is not passed through the diagonal groove. As a result, the conductor plate is not effectively cooled and the rotary electric machine fails to exhibit its enhanced performance.
It is accordingly the object of this invention to provide a rotary electric machine in which a rotor winding is efficiently cooled by a cooling medium introduced into the rotor.
According to this invention, there is provided a stator and a rotor: a rotor body having a plurality of slots, a rotor winding having i~ the 910t a plurality of superposed conductors insulated from each other and each formed of first and second conductor plates, the first conductor plate having inlet hole groups each consisting of at least one inlet hole and outlet hole groups each consisting of at least one outlet hole, said inlet and outlet hole groups being alternately provided in two rows in the direction of the axis of the ~L
-- 1 - , qp ... . . _ L _Or body with the inlet and outlet hole groups in one row oppositely facin~ ~e inlet and outlet hole groups in the other rows, respecti~ely, the inlet and outlet of the first conductor plates being respectively aligned with each other, the first conductor plate having grooves th~ough which the inlet and outlet holes in one row are connected ~o the outlet and inlet holes in the other row, respectively, and the ~econd conductor plate being disposed on the grooved surface of the first conductor plate and having holes in alignment with ~he inlet and outlet holes in the first conductor plate, and wedges coverin~
the opening of the slot and each having inlets and outlets formed corresponding to the inlet and outlet holes of the first conductor plate.
- This invention can be more fully understood from the following detailea description when taken in conjunction with the accompanyinq drawings, in whichs Fig. 1 is a partial cross-sectional view schematically showing ~ rotary electric machine according to one embodiment of this invention which is provided with a rotary cooling structure for a rotor winding;
Fig. 2 i8 a schematic partial cross-sectional view, partly broken away, showing a structure for a rotor of the rotary electric machine in Fig. 1:
Fig. 3 is a cross-sectional view, taken along line III~ITI in Fig. 1, showing a gas inlet section of a rotor winding of the rotor in Fig. 2;
Fig. 4 is a partial cross-sectional view, taken along line IV-A IV in Fig.-~ showing a gas outlet section of the rotor winding of the rotor in Fig.-t~
Fig. S is a top view showing the rotor winding of the rotor in Fig. 2:
Fig. 6 shows a modified form of the rotor winding in Fig. 5;
Fig. 7 shows a rotary electric machine according to another e~bodiment of this invention which has the rotor winding ir, Fig. 6:
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Fig. 8 is a modified form of a conductor plate in the rotary electric machine.
A rotary electric machine according to one embodiment of this - invention will now be explained below by referring to the accompanying drawings.
Fig. 1 shows a generator 10 according to one embodiment of this ; I invention. m e generator 10 nas a stator 12 and a rotor 14 between which a clearance 11 is provided. Inner and outer casings 16 and 17 are provided to enclose the stator 12 and the rotor 14. The rotor 14 has at each end a shaft 18 journaled in the bearing 21 and is rotatably supported by the shaft 18 within the stator 12. The rotor 14 has inlets 20 for suckinq a cooling gas, for exampie, a cool-n~
air or hydrogen gas and outlets 22 for exhausting the cooling gas , _ .
which has been circulated within the rotor 14 to cause a winding of the rotor 14 to be cooled. The inlets 20 and outlets 22 are radially formed in the circumference of the rotor 14 and alternately disposed in the ax$al direction of the rotor 14. A pair of air blowers 24 are provided on the shaft 18 one at each end side of the rotor 14 and adapted to send into the inner casing 16, for example, the cooling air or hydrogen gas which is cooled within the inner casin~
16 and in a spacing defined between the inner and outer casin~s 16 and 17. Most of the cooling air i6 passed through the clearance il between the stator 12 and the r~tor 1~ and sent out of the stator 12 through ducts 13. Some of the cooling air sent by the air blower 24 into the inner casing 16 is sent out of the stator 12 through a stator coil end 19 and meets the cooling gas passed through the ducts 13. m e cooling gas is passed through the spacing between the inner casing 16 and the outer casing 17 and comes to the inlet side of the air blower 2~ through a heat exchanger, not shown, where it is recirculated. Some of the cooling air present between tne stator 12 and the rotor 14 is circulated through slots 26 (Fig. 2) from the inlets 20 in the rotor 14 and exhausted from the outlet 22. The so exhausted air is diffused within the clearance 11 between the statOr '~
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a ~ the rotcr.
Fig. 2 is a partial cross-sectional view, partly broken away, 8howinq details of the rotor 14. Slots 26 are radially formed in the circumference of an iron core 15 of the rotor 14 and have a wall covered with an insulating plate 28. The o~ening of the slot 26 is closed by a wedge 30. The inlets 20 and outlets 22 are alternately formed in the wedge 30 in the axial direction of the rotor 14.
Within the slot 26 is received a rotor winding formed of alternately ~uperposed conductor plates 32A and 32~. The conductor plate 32A
has two rows of alternately arranged outlet and inlet holes 3~ ar.d 36 and diagonal grooves 38 which connect the inlet and outlet holes 36 and 34 in one row to the outlet and inlet holes in the other row, respectively. The respective outlet and nlet holes 34 and 36 communicate with the outlet 22 and inlet 20 respectively through respective through bores 42 in a creepage block 40 disposed between the wedge 30 and the rotor winding.
Fig. 3 i8 a cross-sectional view showing the rotor cut along its vertical plane including the inlet 20 i.e. taken along line III-III in Fig. 1. Superposed in the slot in the iron core 15 of the rotor 14 are plate-like conductors 32 forming the rotor winding which each consist of the conductor plates 32A and 32B. Insulating plates 44 are each disposed immediately below the conductor plate 32A so as to effect an insulation between the conductors 32. The so superposed conductors 32 or the rotor ~inding is fixed in 'he slot 26 by the insulating creepage block 40 and wedge 30. The conductor plate 32 and insulating plate 44 are respectively provided with elongated holes 35 and 45 which are in alignment with the inlet port 36 of the conductor plate 32A to constitute a cooling gas inlet passage. The so aligned elongated holes 35, 36, 45 in the respective conductor plates are made narrower and shorter toward the base of the slot 26. This permits the cooling gas introduced from the inlet 20 of the wedge 30 through the through bore 42 of the creepage block 40 to be substantially uniformly distributed through the respecti~e , .. ..
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104858;~ 1 diagonal grooves 38. During the rotation of the rotor t the inlet 20 of the wedge 30 is opened in the direction of rotation of the rotor 14 as indicated by an arrow A so as to introduce more cooling gas present between the stator and the rotor 14. A projecting member 46 triangular in cross section is formed on the central portion of ~he uppermost conductor plate 32B and serves to smoothly direct the cooling gas introduced through the inlet ~0 into the two rows of passages ~ach of which is constituted by the holes 35, 36, ~5.
Fig. 4 is a cross-sectional view showing the rotor cut along i~s vertical plane including the outlet 22 i.e. along line IV-IV in - Fig. 1. The conductor plates 32A and 32B, insulating plate 44, creepage block 40 and projecting block 46 in Fig. 4 have an arrangement similar to those shown in Fig. 3. That is~ the outlet hole 34 of the conductor plate 32A, the hole 33 of the conductor plate 32B and the hole 45 of the insulating plate 44 are combined to constitute an . . i outlet passage for the cooling gas. The cooling gas is exhausted 5 from the o~tlet passage through the th.ough bore 42 of the creepage block 40 and outlet 22 of the wedge 30 toward the outside. The outlet 22 of the wedge 30 is opened in a direction opposite t~ the direction of rotation of the rotor 14 as indicated by an arrow A so that the cooling gas can be easily exhaustea toward the outside.
i Fig. 5 shows a top plan view of the rotor winding in Fig. 2.
The cooling gas introduced into the inlet hole 36 is passed down the slot 26 through the inlet passage and directed through the diagonal groove 38 toward the outlet hole 34.
The operation of the rotary electric machine will now be explained below.
cooling gas is sent by the air blower 24 (Fig. 1) into the clearance between the stator 12 and the rotor 1~. As shown in Fig.
30 3 the cooling gas is introduced through the inlet 20 of the wedge 30 into the slot 26. That is, the cooling gas is branched at the through bore 42 of the creepage block 40 and directed toward two rows of the inlet passages each formed by the holes 35, 36, 45. The .
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- c~oling gas cools the conductor plates 32A and 32B while being sent down the sl~t 26, and flows from the inlet hole 36 toward the diagonal groove 38 in the surface of the conductor plate 32~ so that the conductor plates 32~ and 32B are cooled. Then, the cooling gas is passed from the diagonal groove 38 through two rows of outlet passages each formed by the holes 33, 34 and 45 (Fi~. 4) toward the through bore 42 of the creepage block 40, while cooling the conductor plates 32A and 32B. The cooling gases exhausted from the t~o rows of outlet passages meet at the hole ~2 of the creepage block 40 and then are exhausted and diffused into ~he clearance between the stator 12 and the rotor 14 through the outlet 22 of the wedge 30.
Unlike the conventional rotary electric machine in which the cooling gas is passed through cutouts provided at each side of the rotor winding, in the rotary electric machine according to this invention, the cooling gas is passed ~rough the holes formed in the rotor winding. As a result, the cooling gas is not ieaked from the passage formed Dy the ho;es and the cooling gas passed through the passage is contacted with the entire surface of the holes n the - oonductor plates for the rotor winding so that the rotor winding can be efficiently cooled. Thus, the rotary electric machine can attain an elevated performance.
~ lthough one embodiment of this invention has been explained by way of example, this invention is not restricted to this embodiment only and a variety of modifications can be made without departing from the spirit and scope of this invention. In the embodiment of this invention, for example, the inlet and outlet holes 36 and 34 in the conductor plate 32~ which are situated at the higher position of the slot 26 are made wider and longer than those in the conductor plate 32~ which are situated at the lower position of the slot ~6.
This arrangement permits the cooling gas to be uniformly passed through the diagonal grooves in the respective conductor plates 32A.
From the standpoint of manufacture, the inlet and outlet holes 36 and 34 situated at the lower and the higher positions may be formed ~ - 6 -,~
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tu have the same dimension~
In the embodiment, the inlet and outlet holes are alternatel~
provided in the conductor plate 32A. However, groups consisting of a predetermined number of inlet holes 36 and groups consisting of a corresponding number of outlet holes 34 may be alternately formed in the conductor plate 32A. As shown in Fig. 6, for example, groups consisting of four inlet holes 36 and groups consisting of four outlet holes 34 may be alternately provided in two rows with the inlet and outle~ hole groups in one row oppositely facing the inlet and outlet hole groups in the other rows, respectively. The inlet hole 3~ in tha inlet hole group in one row is connected through a diagonal groove to the outlet hole 34 in the outlet hole group in the other row. In this case, it is necessary that the inlet and outlot of the wedge 30 be provided in a manner to correspond to the inlet and outlet holes of the rotor winding. This embodiment i5 shown in cross section in Fig. 7. In~~ig. 7, similar reference numera;s ara employed to designate parts or elements corresponding to those shown in Fig. 1. In this embodiment, a cooling gas compressed ~; by an air blower 24 is sent direct into the inlet 20 of the wedge 30 to define a gas inlet zone 48 and a gas outlet zone 50. As a result, there is no chance that a warmed gas from the outlet 2Z of a wedge 30 will flow back into the inlet 20 of the wedge 3~ and be mixed with a low temperature cooling gas. Therefore, a cooling effect can be elevated and the arrangement is fitted for a large-capacity -rotary electric machine.
In the above-mentioned two embodiments the conductors ~2 for the rotor winding have a two-ply structure consisting of the conductor plate 32A (first conductor section) and conductor plate 32B (second , conductor section). In the large-capacity rotary electric machine the conductor 32 can be formed to have a three-ply structure consisting of the conductor plate 32A (first conductor section), ¢onductor plate 32B (second conductor section) and conductor plate 32C (third conductor section). In this case, the conductor plate 32C similar .
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1 configuration tc the conductor plate 32A is placed on the conductor plate 32B with the inlet and outlet holes directe~ downward and ~he diagonal groove is provided in the conductor plates 32A and 32C. As a result, an air contact surface and a heat transfer surface can be Incre~sed, thereby attaining an elevated coolinc efficiency.
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A conventional rotary electric machine such as a turbine generator is cooled by introducir.g a cooling medium such as cooling gas into slots in which a rotor winding is disposed and bringing it into direct contact with the rotor winding. The rotor winding conductor plates superposed within the slot have gas inlet and outlet cutouts alternately formed on each side portion and in the direction of the conductor plate and diagonal grooves connecting the inlet and outlet cutouts to each other. A cooling gas introduced from the gas inlet cutout is passed through the diagonal groove to cool the conductor plate and exhausted from the gas outlet_cutouts. In the rotary electric machine of this type, however, the cooling gas introduced into the gas inlet cutout is leaked from a clearance between the conductor plate and an insulating plate surrounding he conductor plate. ~s a resulf, the gzs enters direct ~nto the neighboring outlet cutout and is exhausted to the outside without contributing to cooling of the rotor winding. For this reason, an effective amount of gas is not passed through the diagonal groove. As a result, the conductor plate is not effectively cooled and the rotary electric machine fails to exhibit its enhanced performance.
It is accordingly the object of this invention to provide a rotary electric machine in which a rotor winding is efficiently cooled by a cooling medium introduced into the rotor.
According to this invention, there is provided a stator and a rotor: a rotor body having a plurality of slots, a rotor winding having i~ the 910t a plurality of superposed conductors insulated from each other and each formed of first and second conductor plates, the first conductor plate having inlet hole groups each consisting of at least one inlet hole and outlet hole groups each consisting of at least one outlet hole, said inlet and outlet hole groups being alternately provided in two rows in the direction of the axis of the ~L
-- 1 - , qp ... . . _ L _Or body with the inlet and outlet hole groups in one row oppositely facin~ ~e inlet and outlet hole groups in the other rows, respecti~ely, the inlet and outlet of the first conductor plates being respectively aligned with each other, the first conductor plate having grooves th~ough which the inlet and outlet holes in one row are connected ~o the outlet and inlet holes in the other row, respectively, and the ~econd conductor plate being disposed on the grooved surface of the first conductor plate and having holes in alignment with ~he inlet and outlet holes in the first conductor plate, and wedges coverin~
the opening of the slot and each having inlets and outlets formed corresponding to the inlet and outlet holes of the first conductor plate.
- This invention can be more fully understood from the following detailea description when taken in conjunction with the accompanyinq drawings, in whichs Fig. 1 is a partial cross-sectional view schematically showing ~ rotary electric machine according to one embodiment of this invention which is provided with a rotary cooling structure for a rotor winding;
Fig. 2 i8 a schematic partial cross-sectional view, partly broken away, showing a structure for a rotor of the rotary electric machine in Fig. 1:
Fig. 3 is a cross-sectional view, taken along line III~ITI in Fig. 1, showing a gas inlet section of a rotor winding of the rotor in Fig. 2;
Fig. 4 is a partial cross-sectional view, taken along line IV-A IV in Fig.-~ showing a gas outlet section of the rotor winding of the rotor in Fig.-t~
Fig. S is a top view showing the rotor winding of the rotor in Fig. 2:
Fig. 6 shows a modified form of the rotor winding in Fig. 5;
Fig. 7 shows a rotary electric machine according to another e~bodiment of this invention which has the rotor winding ir, Fig. 6:
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Fig. 8 is a modified form of a conductor plate in the rotary electric machine.
A rotary electric machine according to one embodiment of this - invention will now be explained below by referring to the accompanying drawings.
Fig. 1 shows a generator 10 according to one embodiment of this ; I invention. m e generator 10 nas a stator 12 and a rotor 14 between which a clearance 11 is provided. Inner and outer casings 16 and 17 are provided to enclose the stator 12 and the rotor 14. The rotor 14 has at each end a shaft 18 journaled in the bearing 21 and is rotatably supported by the shaft 18 within the stator 12. The rotor 14 has inlets 20 for suckinq a cooling gas, for exampie, a cool-n~
air or hydrogen gas and outlets 22 for exhausting the cooling gas , _ .
which has been circulated within the rotor 14 to cause a winding of the rotor 14 to be cooled. The inlets 20 and outlets 22 are radially formed in the circumference of the rotor 14 and alternately disposed in the ax$al direction of the rotor 14. A pair of air blowers 24 are provided on the shaft 18 one at each end side of the rotor 14 and adapted to send into the inner casing 16, for example, the cooling air or hydrogen gas which is cooled within the inner casin~
16 and in a spacing defined between the inner and outer casin~s 16 and 17. Most of the cooling air i6 passed through the clearance il between the stator 12 and the r~tor 1~ and sent out of the stator 12 through ducts 13. Some of the cooling air sent by the air blower 24 into the inner casing 16 is sent out of the stator 12 through a stator coil end 19 and meets the cooling gas passed through the ducts 13. m e cooling gas is passed through the spacing between the inner casing 16 and the outer casing 17 and comes to the inlet side of the air blower 2~ through a heat exchanger, not shown, where it is recirculated. Some of the cooling air present between tne stator 12 and the rotor 14 is circulated through slots 26 (Fig. 2) from the inlets 20 in the rotor 14 and exhausted from the outlet 22. The so exhausted air is diffused within the clearance 11 between the statOr '~
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a ~ the rotcr.
Fig. 2 is a partial cross-sectional view, partly broken away, 8howinq details of the rotor 14. Slots 26 are radially formed in the circumference of an iron core 15 of the rotor 14 and have a wall covered with an insulating plate 28. The o~ening of the slot 26 is closed by a wedge 30. The inlets 20 and outlets 22 are alternately formed in the wedge 30 in the axial direction of the rotor 14.
Within the slot 26 is received a rotor winding formed of alternately ~uperposed conductor plates 32A and 32~. The conductor plate 32A
has two rows of alternately arranged outlet and inlet holes 3~ ar.d 36 and diagonal grooves 38 which connect the inlet and outlet holes 36 and 34 in one row to the outlet and inlet holes in the other row, respectively. The respective outlet and nlet holes 34 and 36 communicate with the outlet 22 and inlet 20 respectively through respective through bores 42 in a creepage block 40 disposed between the wedge 30 and the rotor winding.
Fig. 3 i8 a cross-sectional view showing the rotor cut along its vertical plane including the inlet 20 i.e. taken along line III-III in Fig. 1. Superposed in the slot in the iron core 15 of the rotor 14 are plate-like conductors 32 forming the rotor winding which each consist of the conductor plates 32A and 32B. Insulating plates 44 are each disposed immediately below the conductor plate 32A so as to effect an insulation between the conductors 32. The so superposed conductors 32 or the rotor ~inding is fixed in 'he slot 26 by the insulating creepage block 40 and wedge 30. The conductor plate 32 and insulating plate 44 are respectively provided with elongated holes 35 and 45 which are in alignment with the inlet port 36 of the conductor plate 32A to constitute a cooling gas inlet passage. The so aligned elongated holes 35, 36, 45 in the respective conductor plates are made narrower and shorter toward the base of the slot 26. This permits the cooling gas introduced from the inlet 20 of the wedge 30 through the through bore 42 of the creepage block 40 to be substantially uniformly distributed through the respecti~e , .. ..
.. .
104858;~ 1 diagonal grooves 38. During the rotation of the rotor t the inlet 20 of the wedge 30 is opened in the direction of rotation of the rotor 14 as indicated by an arrow A so as to introduce more cooling gas present between the stator and the rotor 14. A projecting member 46 triangular in cross section is formed on the central portion of ~he uppermost conductor plate 32B and serves to smoothly direct the cooling gas introduced through the inlet ~0 into the two rows of passages ~ach of which is constituted by the holes 35, 36, ~5.
Fig. 4 is a cross-sectional view showing the rotor cut along i~s vertical plane including the outlet 22 i.e. along line IV-IV in - Fig. 1. The conductor plates 32A and 32B, insulating plate 44, creepage block 40 and projecting block 46 in Fig. 4 have an arrangement similar to those shown in Fig. 3. That is~ the outlet hole 34 of the conductor plate 32A, the hole 33 of the conductor plate 32B and the hole 45 of the insulating plate 44 are combined to constitute an . . i outlet passage for the cooling gas. The cooling gas is exhausted 5 from the o~tlet passage through the th.ough bore 42 of the creepage block 40 and outlet 22 of the wedge 30 toward the outside. The outlet 22 of the wedge 30 is opened in a direction opposite t~ the direction of rotation of the rotor 14 as indicated by an arrow A so that the cooling gas can be easily exhaustea toward the outside.
i Fig. 5 shows a top plan view of the rotor winding in Fig. 2.
The cooling gas introduced into the inlet hole 36 is passed down the slot 26 through the inlet passage and directed through the diagonal groove 38 toward the outlet hole 34.
The operation of the rotary electric machine will now be explained below.
cooling gas is sent by the air blower 24 (Fig. 1) into the clearance between the stator 12 and the rotor 1~. As shown in Fig.
30 3 the cooling gas is introduced through the inlet 20 of the wedge 30 into the slot 26. That is, the cooling gas is branched at the through bore 42 of the creepage block 40 and directed toward two rows of the inlet passages each formed by the holes 35, 36, 45. The .
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104~58;~
- c~oling gas cools the conductor plates 32A and 32B while being sent down the sl~t 26, and flows from the inlet hole 36 toward the diagonal groove 38 in the surface of the conductor plate 32~ so that the conductor plates 32~ and 32B are cooled. Then, the cooling gas is passed from the diagonal groove 38 through two rows of outlet passages each formed by the holes 33, 34 and 45 (Fi~. 4) toward the through bore 42 of the creepage block 40, while cooling the conductor plates 32A and 32B. The cooling gases exhausted from the t~o rows of outlet passages meet at the hole ~2 of the creepage block 40 and then are exhausted and diffused into ~he clearance between the stator 12 and the rotor 14 through the outlet 22 of the wedge 30.
Unlike the conventional rotary electric machine in which the cooling gas is passed through cutouts provided at each side of the rotor winding, in the rotary electric machine according to this invention, the cooling gas is passed ~rough the holes formed in the rotor winding. As a result, the cooling gas is not ieaked from the passage formed Dy the ho;es and the cooling gas passed through the passage is contacted with the entire surface of the holes n the - oonductor plates for the rotor winding so that the rotor winding can be efficiently cooled. Thus, the rotary electric machine can attain an elevated performance.
~ lthough one embodiment of this invention has been explained by way of example, this invention is not restricted to this embodiment only and a variety of modifications can be made without departing from the spirit and scope of this invention. In the embodiment of this invention, for example, the inlet and outlet holes 36 and 34 in the conductor plate 32~ which are situated at the higher position of the slot 26 are made wider and longer than those in the conductor plate 32~ which are situated at the lower position of the slot ~6.
This arrangement permits the cooling gas to be uniformly passed through the diagonal grooves in the respective conductor plates 32A.
From the standpoint of manufacture, the inlet and outlet holes 36 and 34 situated at the lower and the higher positions may be formed ~ - 6 -,~
1~4858Z
tu have the same dimension~
In the embodiment, the inlet and outlet holes are alternatel~
provided in the conductor plate 32A. However, groups consisting of a predetermined number of inlet holes 36 and groups consisting of a corresponding number of outlet holes 34 may be alternately formed in the conductor plate 32A. As shown in Fig. 6, for example, groups consisting of four inlet holes 36 and groups consisting of four outlet holes 34 may be alternately provided in two rows with the inlet and outle~ hole groups in one row oppositely facing the inlet and outlet hole groups in the other rows, respectively. The inlet hole 3~ in tha inlet hole group in one row is connected through a diagonal groove to the outlet hole 34 in the outlet hole group in the other row. In this case, it is necessary that the inlet and outlot of the wedge 30 be provided in a manner to correspond to the inlet and outlet holes of the rotor winding. This embodiment i5 shown in cross section in Fig. 7. In~~ig. 7, similar reference numera;s ara employed to designate parts or elements corresponding to those shown in Fig. 1. In this embodiment, a cooling gas compressed ~; by an air blower 24 is sent direct into the inlet 20 of the wedge 30 to define a gas inlet zone 48 and a gas outlet zone 50. As a result, there is no chance that a warmed gas from the outlet 2Z of a wedge 30 will flow back into the inlet 20 of the wedge 3~ and be mixed with a low temperature cooling gas. Therefore, a cooling effect can be elevated and the arrangement is fitted for a large-capacity -rotary electric machine.
In the above-mentioned two embodiments the conductors ~2 for the rotor winding have a two-ply structure consisting of the conductor plate 32A (first conductor section) and conductor plate 32B (second , conductor section). In the large-capacity rotary electric machine the conductor 32 can be formed to have a three-ply structure consisting of the conductor plate 32A (first conductor section), ¢onductor plate 32B (second conductor section) and conductor plate 32C (third conductor section). In this case, the conductor plate 32C similar .
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1 configuration tc the conductor plate 32A is placed on the conductor plate 32B with the inlet and outlet holes directe~ downward and ~he diagonal groove is provided in the conductor plates 32A and 32C. As a result, an air contact surface and a heat transfer surface can be Incre~sed, thereby attaining an elevated coolinc efficiency.
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Claims (9)
1. A rotary electric machine comprising a stator and a rotor including:
a rotor body having a plurality of slots, a rotor winding having in the slot a plurality of superposed conductors insulated from each other and each formed of first and second conductor plates, the first conductor plate having inlet hole groups each consisting of at least one inlet hole and outlet hole groups each consisting of at least one outlet hole, said inlet and outlet hole groups being alternately provided in two rows in the direction of the axis of the rotor body with the inlet and outlet hole groups in one row oppositely facing the inlet and outlet hole groups in the other row, respectively, the inlet and outlet holes of the first conductor plates being respectively aligned with each other, the first conductor plate having grooves through which the inlet and outlet holes in one row are connected to the outlet and inlet holes in the other row, respectively, the second conductor plate being disposed on the grooved surface of the first conductor plate and having holes in alignment with the inlet and outlet holes in said first conductor plate, and wedges covering the opening of the slot and each having inlets and outlets corresponding to the inlet and outlet holes of the first conductor plate, in which the inlet, outlet, inlet hole and outlet hole constitute a passage for a cooling gas.
a rotor body having a plurality of slots, a rotor winding having in the slot a plurality of superposed conductors insulated from each other and each formed of first and second conductor plates, the first conductor plate having inlet hole groups each consisting of at least one inlet hole and outlet hole groups each consisting of at least one outlet hole, said inlet and outlet hole groups being alternately provided in two rows in the direction of the axis of the rotor body with the inlet and outlet hole groups in one row oppositely facing the inlet and outlet hole groups in the other row, respectively, the inlet and outlet holes of the first conductor plates being respectively aligned with each other, the first conductor plate having grooves through which the inlet and outlet holes in one row are connected to the outlet and inlet holes in the other row, respectively, the second conductor plate being disposed on the grooved surface of the first conductor plate and having holes in alignment with the inlet and outlet holes in said first conductor plate, and wedges covering the opening of the slot and each having inlets and outlets corresponding to the inlet and outlet holes of the first conductor plate, in which the inlet, outlet, inlet hole and outlet hole constitute a passage for a cooling gas.
2. A rotary electric machine according to claim 1, in which said rotor has creepage blocks each disposed between the rotor winding and the wedge so as to fix the respective conductors of the rotor winding within the slot, and having through bores through which the inlets and outlets of the wedge communicate with the inlet and outlet holes of the first conductor plate, respectively.
3. A rotary electric machine according to claim 2, in which the inlet and outlet holes of the first conductor plate within the slot are alternately arranged.
1. A rotary electric machine according to claim 3, in which the inlet and outlet holes of those first and second conductor plates which are arranged at a higher position of the slot are substantially the same as, or larger in dimension than, the inlet and outlet holes of those first and second conductor plates which are arranged at a lower position of the slot.
5. A rotary electric machine according to claim 2, in which the inlet and outlet holes of the first conductor plate within the slot are alternately arranged in groups of four.
6. A rotary electric machine according to claim 5, in which the inlet and outlet holes of those first and second conductor plates which are arranged at a higher position of the slot are substantially the same, or larger in dimension than, the inlet and outlet holes of those first and second conductor plates which are arranged at a lower position of the slot.
7. A rotary electric machine according to clam 2, in which the inlet of the wedge is opened in a direction of rotation of said rotor to permit the cooling gas to be introduced into the slot, and the outlet of the wedge is opened in a direction opposite to the direction of rotation of the rotor to permit the circulated gas to be exhausted toward the outside.
8. A rotary electric machine according to claim 1, further including a casing for enclosing said rotor and stator and an air blower for sending a cooling gas into a clearance within the casing.
9. A rotary electric machine according to claim 1, in which the conductor has a third conductor plate which has inlet and outlet holes and groups formed in the same manner as in the first conductor plate and which is disposed on the second conductor plate with the grooved surface thereof facing that side of the second conductor plate which is opposite to that on which said first conductor section is disposed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2049975U JPS51102707U (en) | 1975-02-14 | 1975-02-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1048582A true CA1048582A (en) | 1979-02-13 |
Family
ID=12028843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA76245617A Expired CA1048582A (en) | 1975-02-14 | 1976-02-12 | Gas-cooled rotor winding for dynamo-electric machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS51102707U (en) |
| CA (1) | CA1048582A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS527523B2 (en) * | 1971-09-06 | 1977-03-03 |
-
1975
- 1975-02-14 JP JP2049975U patent/JPS51102707U/ja active Pending
-
1976
- 1976-02-12 CA CA76245617A patent/CA1048582A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS51102707U (en) | 1976-08-18 |
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