CA1083212A - Stator core cooling for dynamoelectric machines - Google Patents
Stator core cooling for dynamoelectric machinesInfo
- Publication number
- CA1083212A CA1083212A CA315,276A CA315276A CA1083212A CA 1083212 A CA1083212 A CA 1083212A CA 315276 A CA315276 A CA 315276A CA 1083212 A CA1083212 A CA 1083212A
- Authority
- CA
- Canada
- Prior art keywords
- core
- plate
- laminations
- vent
- stator core
- 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
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/42—Means for preventing or reducing eddy-current losses in the winding heads, e.g. by shielding
-
- 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
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S174/00—Electricity: conductors and insulators
- Y10S174/13—High voltage cable, e.g. above 10kv, corona prevention
- Y10S174/14—High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding
- Y10S174/19—High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding in a dynamo-electric machine
- Y10S174/20—Stator
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S174/00—Electricity: conductors and insulators
- Y10S174/13—High voltage cable, e.g. above 10kv, corona prevention
- Y10S174/32—High voltage cable, e.g. above 10kv, corona prevention having means for cooling
Abstract
STATOR CORE COOLING FOR DYNAMOELECTRIC
MACHINES
ABSTRACT OF THE DISCLOSURE
Improved cooling is provided for the end regions of the stator core of a large dynamoelectric machine. For this purpose, a solid rigid vent plate is placed in contact with the finger plate at each end of the core. The vent plates are non-magnetic plates of the same configuration as the core laminations and have radial grooves in at least one surface.
Coolant gas flows through the grooves to directly cool the finger plate and the end laminations of the stator core.
MACHINES
ABSTRACT OF THE DISCLOSURE
Improved cooling is provided for the end regions of the stator core of a large dynamoelectric machine. For this purpose, a solid rigid vent plate is placed in contact with the finger plate at each end of the core. The vent plates are non-magnetic plates of the same configuration as the core laminations and have radial grooves in at least one surface.
Coolant gas flows through the grooves to directly cool the finger plate and the end laminations of the stator core.
Description
BACKG~OUND OF THE INVENTION
- The present invention relates to cooling the stator cores o large dynamoelectric machine~, and more particularly to improved cooling of the end regions of such cores.
Dyna electrlc machines, such as large generators, have stator cores which are built up of laminations in order to reduce the eddy current los~ ln the core, but substantial hysteresis and eddy current losses occur and the resulting heat must be dissipated to keep the temperature rise within the required limits. This i8 usually done by dividing the laminations into packs which are spaced apart axially of the core to form radial vents for the circulation of coolant gas through the core.
These radial vents are formed by mean~ of vent plates which are placed at intervals in the laminated core to space ad~acent laminations apart and thus to form the vents between packs of tightly-clamped laminations. The conventional vent 10832~2 47,628 plates commonly used for this purpose consist of punchings which are identLcal in configuration to the punchings or laminations of whlch the core is built and provided with spacing fingers. The fingers are thin sheet metal members extending generally radlally of the vent plate and pro3ecting perpendicularly to the plane of the plate. The fingers are typically about 0.125 inch in he~ght ant are riveted to the plate. When such a vent plate is incorporated in a stack of laminations, the pro~ecting fingers space the ad~acent lamina-tions apart to form a radial duct equal in width to the heigh~of the fingers.
These conventional vent plates operate satisfactorily but involve certain problems due to unavoitable manufacturing ~ `
variations. The fingers are produced by dies from thin ~heet metal and vary slightly in dimensions and shape, and may also show a slight taper from one end to the other. The total thickness of the plate and finger at the points where the ~ ;
finger~ are riveted to the plates can also vary from one place to another. The~e variations are unavoidable and while they are quite 8mall if proper quality control is maintained, never-theless they are sufficient to cause problems of mechanical stability in some cases and may affect the gas flow through the radial vents.
The problem of cooling the stator core i8 parti-cularly difficult in the core end region8 of large machines such as turbine generators. In large synchronous machines, the current~ in the end turn portions of the rotor winding and in the end portions of the ~tator w~ndings have magnetic
- The present invention relates to cooling the stator cores o large dynamoelectric machine~, and more particularly to improved cooling of the end regions of such cores.
Dyna electrlc machines, such as large generators, have stator cores which are built up of laminations in order to reduce the eddy current los~ ln the core, but substantial hysteresis and eddy current losses occur and the resulting heat must be dissipated to keep the temperature rise within the required limits. This i8 usually done by dividing the laminations into packs which are spaced apart axially of the core to form radial vents for the circulation of coolant gas through the core.
These radial vents are formed by mean~ of vent plates which are placed at intervals in the laminated core to space ad~acent laminations apart and thus to form the vents between packs of tightly-clamped laminations. The conventional vent 10832~2 47,628 plates commonly used for this purpose consist of punchings which are identLcal in configuration to the punchings or laminations of whlch the core is built and provided with spacing fingers. The fingers are thin sheet metal members extending generally radlally of the vent plate and pro3ecting perpendicularly to the plane of the plate. The fingers are typically about 0.125 inch in he~ght ant are riveted to the plate. When such a vent plate is incorporated in a stack of laminations, the pro~ecting fingers space the ad~acent lamina-tions apart to form a radial duct equal in width to the heigh~of the fingers.
These conventional vent plates operate satisfactorily but involve certain problems due to unavoitable manufacturing ~ `
variations. The fingers are produced by dies from thin ~heet metal and vary slightly in dimensions and shape, and may also show a slight taper from one end to the other. The total thickness of the plate and finger at the points where the ~ ;
finger~ are riveted to the plates can also vary from one place to another. The~e variations are unavoidable and while they are quite 8mall if proper quality control is maintained, never-theless they are sufficient to cause problems of mechanical stability in some cases and may affect the gas flow through the radial vents.
The problem of cooling the stator core i8 parti-cularly difficult in the core end region8 of large machines such as turbine generators. In large synchronous machines, the current~ in the end turn portions of the rotor winding and in the end portions of the ~tator w~ndings have magnetic
-2-108321Z 47,628 fields which combine to produce an axially-directed magnetic flux. Thi~ axial flux enters the end of ~he stator core in a directlon generally perpendicular to the core laminations and causes relatively large eddy currents in the end regions of the core slnce the core is not laminated in a direction to minimize these currents. The corresponding losse~ may be quite large and often cause excessive heating in the end regions of the core.
When conventional vent plates as describet above are used in the end regions of a large stator core, it i3 not possible to provide radial vents close t~ the finger plates which clamp the core laminations. The mechanical stability problem discussed above makes it necessary to have a pack of laminations on each side of a conventional vent plate to bridge the ~pacing fingers. The use of bridging l d nations in this `
way provides sufficient flexibility or resilience in the core, even when the laminations are tightly clamped~ to enable the structure to yield enough to distribute the load and thus compensate for the unavoidable small manufacturing variations mentioned above. At each end of the stator core, a ~olid finger plate bears against the core and is engaget by a clamp-ing plate to apply relatively heavy axial clamping pressure to the entire stack of core laminations. Theie finger plates and the statos core laminations tend to become quite hot because of the axial flux mentioned above, to which they are exposed, and because of heat conducted from the core itself, and cooling of this region of the stator core has been very difficult. Conventional vent plates cannot be plsced directly
When conventional vent plates as describet above are used in the end regions of a large stator core, it i3 not possible to provide radial vents close t~ the finger plates which clamp the core laminations. The mechanical stability problem discussed above makes it necessary to have a pack of laminations on each side of a conventional vent plate to bridge the ~pacing fingers. The use of bridging l d nations in this `
way provides sufficient flexibility or resilience in the core, even when the laminations are tightly clamped~ to enable the structure to yield enough to distribute the load and thus compensate for the unavoidable small manufacturing variations mentioned above. At each end of the stator core, a ~olid finger plate bears against the core and is engaget by a clamp-ing plate to apply relatively heavy axial clamping pressure to the entire stack of core laminations. Theie finger plates and the statos core laminations tend to become quite hot because of the axial flux mentioned above, to which they are exposed, and because of heat conducted from the core itself, and cooling of this region of the stator core has been very difficult. Conventional vent plates cannot be plsced directly
-3-~0 83 2~ 2 47,628 ~d~acent the finger plates to provide radial ducts for coolantgas because of the mechanical stability problem discussed above, but must have a pack of laminations of substantial th~ckness on each side to properly distribute the load. Thi8 necessarily spaces the closest radial duct a considerable dis-tance from the finger plate and stator core end laminations so that they are not effectively cooled.
SUMMARY OF THE I~VENTION
The present invention provides an improved vent plate which can be used in direct contact wlth the finger plate at the end of the stator core of a large gen~rator to provide greatly improved cooling and mechanical stability in the core end region.
In accordance with the invention, a rigit vent plate is provided which is preferably made of stainless steel, or o~her non-magnetic material. The vent plate is of sub-stantially the same configuration as the laminatlons of the core, but i8 ~ufficiently thick to be rigid, and radial grooves are machined in one or both surfaces of the plate to provide radial vent passages for flow of coolant gas. Such a vent plate can be placed directly in contact with the finger plate at the end of the stator core 80 that ga~ can flow radially in direct contact with the finger plate or with the stator core end laminations, or both, thus greatly imprOViQg the cooling.
Conventional vent plates adJacent the ends of the core, if needed, can also be placed directly in contact with the new vent plate, or separated from it a much shorter distance than has previously been necessary, so that an inherently stable 1083Z12 47,628 mechanical fitructure i8 provided with greatly improved cooling.
In some cases, the radial groove~ may be omitted and the plate used simply as a back-up plate whlch permits placing a con-ventional vent plate close enough to ~he finger plate and end lamiQations to provlde improved cooling without any 1088 of mechanical stability.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be more fully understoQd from the following detailed description, taken in connection with the accompanying drawings, in which:
Figure 1 is a side view, partly ~roken away, of a large synchronou generstor;
Fig. 2 ~8 a side elevation on an enlarged scale of the end portion of a stator core embodying the invention;
Fig. 3 i~ a front view of one segment of a segmental vent plate embodying the invention;
Fig. 4 i8 a sectiond view on the line IV-IV of Fig. 3; and Fig. 5 is a view ~imilar to Fig. 2 showing a modified embodiment of the invention.
As previously indicated, the invention is particularly useful for the stator cores of large d~namoelectric machines, such a~ turbine generators. Fig. 1 shows a typical con-struction of such a machine including a gas-tight housing 10 with a laminated stator core 12 supported in the housing. The core 12 carries stator windings 14 of any 8uitable type dis-posed in longitudinal slots in the core, and a rotor 16 is supported in bearings in the housing 10 and carries`the usual 10 8 3 ~1 ~ 47,628 field winding. The machine is cooled by clrculation of a cool-ant ga8 ~ u8ually hydrogen, which i8 contained in the housing 10 and circulated through the machine ln any desired flow path lncluding passages and baffles of any desired arrangement, and including radial duct~ provided in the core 12 between packs of laminations as previously described.
The end portion of the core 12 is shown more in detall in Fig. 2, both ends of the core being of the same construction. A~ 8hown, the core is built up of packs 18 of punchlngs or laminations, the packs 18 being separatet bg radial vent spaces 20 formed by vent plates of the usual type, as described above; that is, each radial vent 20 is formed by a plate of the ~ame size and configuration as the ad~acent lamina-tions with projecting sheet metal fingers attached to it to space the adjacent packs apart. The core 12 is clamped together by clamping means of any suitable type at both ends to clamp the core laminations in a stack under heavy pressure in the u~ual manner. The clàmping means at each end i8 ~hown as including a finger plate 22 engaging the end of the core, wlth means generally indicated at 23 to apply clamping pressure by mean~ of bolts or other suitable means (not shown).
As previously explained, the use of conventlonal vent plates involves certain mechanical stability problems which can be overcome throughout m~st of the length of the core by the use of packs of laminations on each s~de of each vent plate which have sufficient elasticity to yield a8 required to dis-tribute the load and ad~ust for minor manufacturing variations.
At the end8 of the coreJ however, a convéntional vent plate ` 1083'~1Z 47,~8 cannot be placed directly in contact with the heavy rigid finger plate, as previously explained, snd it has been neces-sary heretofore to interpo~e a pack of laminations between the finger plste and the vent plate, thus reducing the cooling available for the finger plate and ~tator core ent laminations since the radial coolant gas flow i~ spaced a ~ub~tantial dis-tance away, while the intervening stack of laminations is itself a source of additional heat.
In accordance with the present invention, a vent plate is provided which permits much more effèctive cooling of the finger plate and the end portion o$ the core. Fig. 3 shows one segment of a vent plate 25 embodying the invention. It will be unders~ood that in large machines, the annular core punchings or laminations are made up of segments to facilitate handling during ~anufacture ant in building the core, and the vent plate 25 of the present invention is ~imilarly made up of segments, although a complete annular plate could be utilized if the size of the machine permits. The segment 26 shown in Fig. 3 is a rigid non-magnetic plate of sufficient thickness to give it the desired rigidity and mechanical stability, and is preferably made of stainless steel plate about one-quarter inch thick. The segment 26 has the same configuration a8 the punch- -ing segments from which the lamination packs 18 are made, and is shown in Fig. 3 as having three teeth 27 forming slots for stator windings 14, with notches 28 on the outer periphery for reception of the usual core building bolts. Various openings may be provided in the plate 26 as required by the de~ign of a particular machine, including hole~ 29 for clamping bolts and ., - - , ~ , . ~. . .
. 108321Z 47,628 hole~l 30 fonming part of axial coolant passages. The holes 29 and 30 are, of course, aligned with similsr hole~ ln the core punchings to form axial openings extending through the core. IQ accordance with the invention, vent~ for rsdial ga~
flow are provided by machining grooves 31 in the surface of the plate 26. The grooves 31 may be of any desired size and arrangement, depending on the machine design and the gas flow required, and are shown as extending radially from the outer periphery of the plate 26 to the inner ends of the teeth 27.
The vent plate 25 i8 built into the core 12 as shown in Fig. 2, being placed at the end of the core in direct contact with the finger plate 22 with the grooved ~urface st~acent the stator core end laminations. Very effective cooling is thus obtained 8~ nce coolant gas flows radially through the grooves 31 in direct contact with the end laminations. Very effective cool-ing i8 thus provided for the end region of the core and for the clamping means since the finger plate and core are directly cooled by the flow of coolant gas. The complete gas flow path through the machine has not been shown since any suitable or well-known type of ventilation system may be used. If de~ired, the plate 25 might be positioned with the grooves 31 on the side ad~acent the finger plate 22, or grooves 31 mlght be providet on both sides of the plate 25.
It will be seen that the use of a rigid vent plate with machined radial grooves for coolant gas flow has many advantages. The problem of mechanical stabiLity is eliminatet and greatly improved cooling of the end portion of a ~tator core is obtained wi~hout requiring any change in the usual coolant 1 0 83 ~ 1 ~ 47,628 flow or the ventLlation Rystem of the machine itself. In some cases, this improvement in mechanical stab~lity alone is a sufficient advantage and a plate 25 may be used which has no grooves 31. In this case, the plate 25 i8 placed ad~acent the finger plate 22, as shown in Fig. 5 and a radial vent 32 is pro-vided immediately ~d~acent the plate 25 by means of a conven-tional vent plate. The use of the plate 25 a~ a back-up plate in this way makes it possible to locate the vent 32 close to the finger plate without incurring mechanical stability problems resulting from the unavoidable manufacturing variations in the conventional vent plate.
The use of the rigit vent plate 25 has another advan-tage in the case of very large machines in which the airgap is divided transversely into zones of different gas pressure by means of annular barriers in the airgap which are supported on the stator. In conventiona~ designs, it-has been difficult to establish the axial location of the last airgap barrier at one end of the core, because of the increased di~meter of the bore at the ends of the machine, and special tools have been used to locate the barrier. If a rigid vent plate 25 is used,~ however, in the position shown in Fig. 2, the plate can be made of smaller inner diameter, corresponding to that of the bore of the machine, and thus the plate itself acts as a locating element for installatLon of the airgap barrier at that end.
_g_ ,, ,
SUMMARY OF THE I~VENTION
The present invention provides an improved vent plate which can be used in direct contact wlth the finger plate at the end of the stator core of a large gen~rator to provide greatly improved cooling and mechanical stability in the core end region.
In accordance with the invention, a rigit vent plate is provided which is preferably made of stainless steel, or o~her non-magnetic material. The vent plate is of sub-stantially the same configuration as the laminatlons of the core, but i8 ~ufficiently thick to be rigid, and radial grooves are machined in one or both surfaces of the plate to provide radial vent passages for flow of coolant gas. Such a vent plate can be placed directly in contact with the finger plate at the end of the stator core 80 that ga~ can flow radially in direct contact with the finger plate or with the stator core end laminations, or both, thus greatly imprOViQg the cooling.
Conventional vent plates adJacent the ends of the core, if needed, can also be placed directly in contact with the new vent plate, or separated from it a much shorter distance than has previously been necessary, so that an inherently stable 1083Z12 47,628 mechanical fitructure i8 provided with greatly improved cooling.
In some cases, the radial groove~ may be omitted and the plate used simply as a back-up plate whlch permits placing a con-ventional vent plate close enough to ~he finger plate and end lamiQations to provlde improved cooling without any 1088 of mechanical stability.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be more fully understoQd from the following detailed description, taken in connection with the accompanying drawings, in which:
Figure 1 is a side view, partly ~roken away, of a large synchronou generstor;
Fig. 2 ~8 a side elevation on an enlarged scale of the end portion of a stator core embodying the invention;
Fig. 3 i~ a front view of one segment of a segmental vent plate embodying the invention;
Fig. 4 i8 a sectiond view on the line IV-IV of Fig. 3; and Fig. 5 is a view ~imilar to Fig. 2 showing a modified embodiment of the invention.
As previously indicated, the invention is particularly useful for the stator cores of large d~namoelectric machines, such a~ turbine generators. Fig. 1 shows a typical con-struction of such a machine including a gas-tight housing 10 with a laminated stator core 12 supported in the housing. The core 12 carries stator windings 14 of any 8uitable type dis-posed in longitudinal slots in the core, and a rotor 16 is supported in bearings in the housing 10 and carries`the usual 10 8 3 ~1 ~ 47,628 field winding. The machine is cooled by clrculation of a cool-ant ga8 ~ u8ually hydrogen, which i8 contained in the housing 10 and circulated through the machine ln any desired flow path lncluding passages and baffles of any desired arrangement, and including radial duct~ provided in the core 12 between packs of laminations as previously described.
The end portion of the core 12 is shown more in detall in Fig. 2, both ends of the core being of the same construction. A~ 8hown, the core is built up of packs 18 of punchlngs or laminations, the packs 18 being separatet bg radial vent spaces 20 formed by vent plates of the usual type, as described above; that is, each radial vent 20 is formed by a plate of the ~ame size and configuration as the ad~acent lamina-tions with projecting sheet metal fingers attached to it to space the adjacent packs apart. The core 12 is clamped together by clamping means of any suitable type at both ends to clamp the core laminations in a stack under heavy pressure in the u~ual manner. The clàmping means at each end i8 ~hown as including a finger plate 22 engaging the end of the core, wlth means generally indicated at 23 to apply clamping pressure by mean~ of bolts or other suitable means (not shown).
As previously explained, the use of conventlonal vent plates involves certain mechanical stability problems which can be overcome throughout m~st of the length of the core by the use of packs of laminations on each s~de of each vent plate which have sufficient elasticity to yield a8 required to dis-tribute the load and ad~ust for minor manufacturing variations.
At the end8 of the coreJ however, a convéntional vent plate ` 1083'~1Z 47,~8 cannot be placed directly in contact with the heavy rigid finger plate, as previously explained, snd it has been neces-sary heretofore to interpo~e a pack of laminations between the finger plste and the vent plate, thus reducing the cooling available for the finger plate and ~tator core ent laminations since the radial coolant gas flow i~ spaced a ~ub~tantial dis-tance away, while the intervening stack of laminations is itself a source of additional heat.
In accordance with the present invention, a vent plate is provided which permits much more effèctive cooling of the finger plate and the end portion o$ the core. Fig. 3 shows one segment of a vent plate 25 embodying the invention. It will be unders~ood that in large machines, the annular core punchings or laminations are made up of segments to facilitate handling during ~anufacture ant in building the core, and the vent plate 25 of the present invention is ~imilarly made up of segments, although a complete annular plate could be utilized if the size of the machine permits. The segment 26 shown in Fig. 3 is a rigid non-magnetic plate of sufficient thickness to give it the desired rigidity and mechanical stability, and is preferably made of stainless steel plate about one-quarter inch thick. The segment 26 has the same configuration a8 the punch- -ing segments from which the lamination packs 18 are made, and is shown in Fig. 3 as having three teeth 27 forming slots for stator windings 14, with notches 28 on the outer periphery for reception of the usual core building bolts. Various openings may be provided in the plate 26 as required by the de~ign of a particular machine, including hole~ 29 for clamping bolts and ., - - , ~ , . ~. . .
. 108321Z 47,628 hole~l 30 fonming part of axial coolant passages. The holes 29 and 30 are, of course, aligned with similsr hole~ ln the core punchings to form axial openings extending through the core. IQ accordance with the invention, vent~ for rsdial ga~
flow are provided by machining grooves 31 in the surface of the plate 26. The grooves 31 may be of any desired size and arrangement, depending on the machine design and the gas flow required, and are shown as extending radially from the outer periphery of the plate 26 to the inner ends of the teeth 27.
The vent plate 25 i8 built into the core 12 as shown in Fig. 2, being placed at the end of the core in direct contact with the finger plate 22 with the grooved ~urface st~acent the stator core end laminations. Very effective cooling is thus obtained 8~ nce coolant gas flows radially through the grooves 31 in direct contact with the end laminations. Very effective cool-ing i8 thus provided for the end region of the core and for the clamping means since the finger plate and core are directly cooled by the flow of coolant gas. The complete gas flow path through the machine has not been shown since any suitable or well-known type of ventilation system may be used. If de~ired, the plate 25 might be positioned with the grooves 31 on the side ad~acent the finger plate 22, or grooves 31 mlght be providet on both sides of the plate 25.
It will be seen that the use of a rigid vent plate with machined radial grooves for coolant gas flow has many advantages. The problem of mechanical stabiLity is eliminatet and greatly improved cooling of the end portion of a ~tator core is obtained wi~hout requiring any change in the usual coolant 1 0 83 ~ 1 ~ 47,628 flow or the ventLlation Rystem of the machine itself. In some cases, this improvement in mechanical stab~lity alone is a sufficient advantage and a plate 25 may be used which has no grooves 31. In this case, the plate 25 i8 placed ad~acent the finger plate 22, as shown in Fig. 5 and a radial vent 32 is pro-vided immediately ~d~acent the plate 25 by means of a conven-tional vent plate. The use of the plate 25 a~ a back-up plate in this way makes it possible to locate the vent 32 close to the finger plate without incurring mechanical stability problems resulting from the unavoidable manufacturing variations in the conventional vent plate.
The use of the rigit vent plate 25 has another advan-tage in the case of very large machines in which the airgap is divided transversely into zones of different gas pressure by means of annular barriers in the airgap which are supported on the stator. In conventiona~ designs, it-has been difficult to establish the axial location of the last airgap barrier at one end of the core, because of the increased di~meter of the bore at the ends of the machine, and special tools have been used to locate the barrier. If a rigid vent plate 25 is used,~ however, in the position shown in Fig. 2, the plate can be made of smaller inner diameter, corresponding to that of the bore of the machine, and thus the plate itself acts as a locating element for installatLon of the airgap barrier at that end.
_g_ ,, ,
Claims (5)
1. In a dynamoelectric machine having a laminated stator core with teeth forming longitudinal slots for windings, clamping means at each end of the core for applying clamping pressure thereto, said clamping means including a finger plate, and a vent plate disposed between the finger plate and the core laminations, said vent plate being a rigid, non-magnetic plate of substantially the same configuration as the core laminations, and having radial grooves in at least one surface thereof for flow of coolant gas.
2. The combination defined in claim 1 in which said vent plate is made of stainless steel.
3. The combination defined in claim 1 in which said grooves are formed in the surface of the vent plate adjacent the core laminations.
4. The combination defined in claim 1 in which said vent plates are of segmental construction and have tooth portions corresponding in position to the teeth of the core, and said radial grooves extend from the outer periphery of the plate to the radially inner end of each of the tooth portions.
5. The combination defined in claim 4 in which said core comprises a plurality of packs of laminations, means for spacing adjacent packs of laminations to form radial ducts therebetween, and means for directing coolant gas to flow through said radial grooves and said radial ducts.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/917,836 US4208597A (en) | 1978-06-22 | 1978-06-22 | Stator core cooling for dynamoelectric machines |
| US917,836 | 1978-06-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1083212A true CA1083212A (en) | 1980-08-05 |
Family
ID=25439397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA315,276A Expired CA1083212A (en) | 1978-06-22 | 1978-10-31 | Stator core cooling for dynamoelectric machines |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4208597A (en) |
| JP (1) | JPS555095A (en) |
| BE (1) | BE877203A (en) |
| CA (1) | CA1083212A (en) |
| DE (1) | DE2924697A1 (en) |
| ES (1) | ES481703A1 (en) |
| FR (1) | FR2429513A1 (en) |
| IT (1) | IT1121821B (en) |
| YU (1) | YU147379A (en) |
Families Citing this family (48)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2913972C2 (en) * | 1979-04-04 | 1984-02-23 | Siemens AG, 1000 Berlin und 8000 München | Liquid-cooled electrical machine |
| US4315173A (en) * | 1980-03-30 | 1982-02-09 | Westinghouse Electric Corp. | Dynamoelectric machines segmental air gap baffle assembly |
| US5091666A (en) * | 1990-06-15 | 1992-02-25 | General Electric Company | Stator cooling system for electrical machinery |
| GB2289992B (en) * | 1994-05-24 | 1998-05-20 | Gec Alsthom Ltd | Improvements in or relating to cooling arrangements in rotating electrical machines |
| JP2000515357A (en) | 1996-05-29 | 2000-11-14 | アセア、ブラウン、ボベリ、アクチエボラーグ | Rotary electric plant |
| SE9602079D0 (en) | 1996-05-29 | 1996-05-29 | Asea Brown Boveri | Rotating electric machines with magnetic circuit for high voltage and a method for manufacturing the same |
| WO1997045918A1 (en) | 1996-05-29 | 1997-12-04 | Asea Brown Boveri Ab | Insulated conductor for high-voltage windings and a method of manufacturing the same |
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| US8456048B2 (en) * | 2010-09-29 | 2013-06-04 | General Electric Company | Cooling structure for a segmented stator assembly |
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| GB2499236A (en) | 2012-02-10 | 2013-08-14 | Rolls Royce Plc | A cooling arrangement for an electrical machine |
| US20140070640A1 (en) * | 2012-09-13 | 2014-03-13 | General Electric Company | Cooling ducts in an electro-dynamic machine |
| WO2015129034A1 (en) * | 2014-02-28 | 2015-09-03 | 富士機械製造株式会社 | Viscous fluid coating device |
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| US11255612B2 (en) | 2014-07-25 | 2022-02-22 | Enure, Inc. | Wound strip machine |
| DE112015003443T5 (en) | 2014-07-25 | 2017-04-06 | Prippell Technologies, Llc | Fluid cooled spiral strip structure |
| US10756583B2 (en) | 2014-07-25 | 2020-08-25 | Enure, Inc. | Wound strip machine |
| US10411563B2 (en) | 2015-01-30 | 2019-09-10 | Prippell Technologies, Llc | Electric machine stator with liquid cooled teeth |
| US9203272B1 (en) | 2015-06-27 | 2015-12-01 | Dantam K. Rao | Stealth end windings to reduce core-end heating in large electric machines |
| US11025137B2 (en) | 2016-09-14 | 2021-06-01 | Mts Systems Corporation | Electric machine with stator cooling channels |
| CN109494899B (en) * | 2018-12-25 | 2021-04-02 | 重庆赛力盟电机有限责任公司 | Stator end plate with large pole number |
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| DE102021200874A1 (en) * | 2021-02-01 | 2022-01-20 | Zf Friedrichshafen Ag | Rotor for an electric machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2902611A (en) * | 1957-11-15 | 1959-09-01 | Allis Chalmers Mfg Co | Supercharged finger plates |
| DE1763579A1 (en) * | 1968-06-26 | 1971-11-11 | Siemens Ag | Arrangement for liquid cooling of the stator core assemblies of electrical machines, especially for turbo generators |
| SE312372B (en) * | 1968-10-28 | 1969-07-14 | Asea Ab | |
| DE1953110B2 (en) * | 1969-10-17 | 1971-08-19 | ELECTRIC MACHINE WITH AN AIR-COOLED HIGH-POLE RUNNER | |
| US3731137A (en) * | 1972-02-03 | 1973-05-01 | Raytheon Co | Coaxial magnetron |
| DE2514255C3 (en) * | 1975-04-01 | 1980-02-14 | Kraftwerk Union Ag, 4330 Muelheim | Arrangement for cooling the laminated core end zones of electrical machines |
| US4088913A (en) * | 1976-02-20 | 1978-05-09 | Prigorovsky Igor Alexandrovich | Electrical machine stator |
| US4035198A (en) * | 1976-06-30 | 1977-07-12 | International Business Machines Corporation | Method of fabricating field effect transistors having self-registering electrical connections between gate electrodes and metallic interconnection lines, and fabrication of integrated circuits containing the transistors |
| US4126799A (en) * | 1977-02-28 | 1978-11-21 | Iogansen Vadim I | Device for securing end connectors of electric machine stator winding |
-
1978
- 1978-06-22 US US05/917,836 patent/US4208597A/en not_active Expired - Lifetime
- 1978-10-31 CA CA315,276A patent/CA1083212A/en not_active Expired
-
1979
- 1979-06-18 IT IT23675/79A patent/IT1121821B/en active
- 1979-06-19 DE DE19792924697 patent/DE2924697A1/en not_active Withdrawn
- 1979-06-20 ES ES481703A patent/ES481703A1/en not_active Expired
- 1979-06-20 FR FR7915833A patent/FR2429513A1/en not_active Withdrawn
- 1979-06-22 JP JP7822379A patent/JPS555095A/en active Pending
- 1979-06-22 YU YU01473/79A patent/YU147379A/en unknown
- 1979-06-22 BE BE0/195912A patent/BE877203A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPS555095A (en) | 1980-01-14 |
| ES481703A1 (en) | 1980-07-01 |
| DE2924697A1 (en) | 1980-01-10 |
| YU147379A (en) | 1982-06-30 |
| IT7923675A0 (en) | 1979-06-18 |
| IT1121821B (en) | 1986-04-23 |
| US4208597A (en) | 1980-06-17 |
| FR2429513A1 (en) | 1980-01-18 |
| BE877203A (en) | 1979-12-24 |
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