GB2419475A - Laminated structure of an electric machine with cooling fluid flow paths - Google Patents
Laminated structure of an electric machine with cooling fluid flow paths Download PDFInfo
- Publication number
- GB2419475A GB2419475A GB0521387A GB0521387A GB2419475A GB 2419475 A GB2419475 A GB 2419475A GB 0521387 A GB0521387 A GB 0521387A GB 0521387 A GB0521387 A GB 0521387A GB 2419475 A GB2419475 A GB 2419475A
- Authority
- GB
- United Kingdom
- Prior art keywords
- laminated structure
- protrusion
- juxtaposed
- protrusions
- laminations
- 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.)
- Withdrawn
Links
- 239000012809 cooling fluid Substances 0.000 title claims abstract description 9
- 238000003475 lamination Methods 0.000 claims abstract description 82
- 238000000034 method Methods 0.000 claims abstract description 33
- 239000012777 electrically insulating material Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 16
- 238000004804 winding Methods 0.000 claims description 6
- 238000005482 strain hardening Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 abstract 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 8
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000003491 array Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
A laminated structure 18 of an electrical machine is disclosed, in which flow paths 19 for cooling fluid are formed between juxtaposed laminations 21, 22 by spaced protrusions 11. The spaced protrusions are formed as integral parts of the juxtaposed laminations and act as separators to space the juxtaposed laminations one from the other, a protrusion being formed at or near the end of a tooth 13. A surface 16 formed by each of the protrusions is domed to provide an aerodynamic surface and the interior of the protrusions may be filled with electrically insulating material. The protrusions may be formed by deep drawing using a pressing tool and die by a cold or hot working process (electric or friction heating). Alternatively the protrusion may be formed by a rotating tool having variable eccentricity.
Description
1 241 9475
LAMINATED STRUCTURE OF AN ELECTRICAL MACHINE WITH
COOLING FLUID FLOW PATHS
This invention relates to laminated structure of an electrical machine in which flow paths for cooling fluid are formed between juxtaposed laminations and more particularly, although not exclusively, to cooling a laminated stator and/or a laminated rotor of an electrical machine.
It is common practice in rotating electrical machinery to cool the stator windings using radial ducts created between electrical laminations permitting air to flow radially inwards or outwards creating a large increase in lamination surface area and similar exposed areas of the coils, for cooling purposes. The radial ducts are created using separators to space juxtaposed laminations of the laminated stator and/or rotor of the electrical machine from one another. Examples of separators which are commonly used include "1"-beam spacers which are spot welded in place to extend radially, cleated steel spacers, steel pillars which are capacitively discharge welded in place in a regular pattern between juxtaposed laminations or so-called "trap-doors" which each comprise a tongue cut out from the material of the lamination and deformed so as to project from the plane of the lamination to which it is joined at its root. Such separators can work loose or become detached in service which is undesirable. Furthermore, such separators may have sharp edges, which could pierce the resin of the adjacent lamination causing a short c rcu.t.
The separators may be subject to large stresses, in particular if they are used in high speed rotating machines. Therefore it is desirable for the separators to be
stable.
According to one aspect of this invention, there is provided a laminated structure of an electrical machine in which flow paths for cooling fluid are formed between juxtaposed laminations by spaced protrusions which are formed as integral parts of a respective one of the juxtaposed laminations and which act as separators to space the juxtaposed laminations one from the other wherein a surface formed by each of the protrusions is domed.
Domed protrusions have been found to be advantageous, since they may be more stable than non-domed protrusions. Furthermore, domed protrusions may reduce the thinning of the lamination material which occurs as the protrusions are formed, which may increase the strength of the protrusions. In addition, when the laminations after assembly into a wound stator core are processed with resin using a Vacuum Pressure Impregnation system or other similar treatments, the resin may fill the domed protrusions which may increase their stability. The ease with which the protrusions may be filled with resin may be enhanced by the domed shape.
By "domed" it is preferably meant that the base of a protrusion is wider than the top. For example, the top of the protrusion may have a width of less than 80%, 70% or 60% of the width of the base.
Preferably, a surface formed by each of the protrusions and material of the respective lamination which surrounds that protrusion is continuous and uninterrupted. That part of the surface of each protrusion which serves as a contact surface which abuts the other of the juxtaposed laminations to space the juxtaposed laminations one from the other may be smooth. In a preferred embodiment, the remainder of each protrusion is frusto-conical, the smooth contact surface part being at the smaller diameter end of the frusto-conical part of the respective protrusion which is joined to the surrounding material of the to respective lamination at its larger diameter end. Conveniently each protrusion is formed by deformation of material of the respective lamination to form a domed pocket which has a hollow interior which may be filled with electrically insulating material for example during impregnation of electrical phase windings wound on the laminated structure. Conveniently that part of the surface which is formed by the respective protrusion is aerodynamic.
In one embodiment, those parts of the protrusions which serve as contact surfaces which abut the other of the juxtaposed laminations abut respective contact surfaces of similar protrusions formed in the other of the juxtaposed laminations. In another embodiment those parts of the protrusions which serve as contact surfaces which abut the other of the juxtaposed laminations abut a flat, un-deformed part of the surface of that other of the juxtaposed laminations. That other of the juxtaposed laminations may be flat and undeformed.
Where laminated structure which embodies this invention is provided with slots at spaced intervals along one edge within which electrical phase windings are to be wound, juxtaposed slots being separated one from the other by tooth portions of the laminated structure, each tooth portion of that one of the juxtaposed laminations with which the respective spaced protrusions are formed as integral parts, has such protrusions formed at or near its tip.
The spaced protrusions may be arranged in a regular pattern on that one of the juxtaposed laminations.
According to another aspect of this invention there is provided a method of forming separators which are for spacing juxtaposed laminations of laminated structure of an electrical machine to form flow paths for cooling fluid through the laminated structure, in which one of the juxtaposed laminations is deformed to form spaced protrusions which are to act as the separators, wherein each protrusion is formed so as to have a domed surface.
Preferably each protrusion is formed so that a surface formed by it and material of the respective lamination which surrounds it is continuous and uninterrupted.
Each separator may be formed by deep drawing using a press tool and a die. The deep drawing process may be a cold working process. Alternatively, the deep drawing process may be a hot working process in which case the compressed tool and the die may be heated electrically or the heat for the hot deep drawing process may be generated by frictional inter- engagement of the press tool and the work piece during the deep drawing process, the press tool being rotated relative to the work piece as it is advanced towards the die.
Alternatively, each protrusion may be formed with a rotating tool having a variable eccentricity.
Two forms of laminated stator for an electrical machine and several methods of forming laminations for such a stator which embody this invention are described now by way of example with reference to the accompanying drawings, of which: Figure 1 is an arcuate fragment of a circular lamination which is for assembly into a slotted laminated stator of an electrical machine; Figure 2 is a view in perspective of detail A of Figure 1 with a sectional profile superimposed thereon; Figure 3 is a view similar to Figure 2 which illustrates air flow through the laminated stator; Figure 4 is a fragmentary cross-section of one of the forms of laminated stator; Figure 5 is a view similar to Figure 4 of the other form of laminated stator; Figure 6 illustrates cold forming part of a lamination as shown in Figures 2 and 3; Figure 7 is a view similar to Figure 6 illustrating one form of hot forming the lamination part; Figure 8 is another view similar to Figure 6 illustrating another form of hot forming the lamination part; and Figure 9 shows an alternative technique for forming domed protrusions.
A laminated annular stator of an electrical machine is formed of a stack of concentric annular laminations of electrical steel each coated with an electrically insulating resin which has been cured and hardened. The radially inner edge of the laminated stack is formed with a circular array of slots, juxtaposed slots being separated by a respective radially inwardly projecting tooth. The stator windings are wound in the slots in the usual way.
A regular array of spaced separators are provided to space apart a juxtaposed pair of the laminations in the middle of the stack and thereby to form cooling ducts in the stator. The separators allow air flow through the stator. That air flow is generally in a radial direction, but the spaced separators allow uniform air flow to all areas of the juxtaposed laminations, some of that air flow being in a partially circumferential direction. Hence, cooling air can flow to all parts of the space between the juxtaposed laminations which are separated by the separators.
Figure 1 shows a plan view of an arcuate fragment 10 of one lamination of the laminated annular stator. The lamination has a regular pattern of separators 11 formed integrally with it all around its circular extent. The thickness of each lamination is typically of the order of 0.65mm. The radially inner edge of the fragment 10 is formed with an array of equispaced slots 12, each juxtaposed pair of the slots 12 being spaced apart by a respective tooth 13.
The regular pattern of separators 11 comprises five concentric circular arrays of equi-spaced separators 11, the separators 11 of each circular array being on substantially the same pitch circle diameter and the radial spacing between each juxtaposed pair of the circular arrays of separators 11 being substantially equal.
Moreover, the separators 11 are arranged in radially extending rows comprising one separator from each of the five circular array of separators. It follows that the separators 11 are symmetrically located about the central axis 14 of the annular lamination.
Figure 1 shows two of the separators 11 being formed on each tooth 13, one of those separators 11 being positioned close to the tip of the respective tooth 13.
Figures 2 and 3 show that each separator 11 is a protrusion which is a deep drawn pocket formed by deformation of the material of the respective lamination.
Each deep drawn pocket is generally frusto-conical with its larger diameter end being integral with the surrounding material of the lamination and with its smaller diameter end 16 forming a contact surface of the protrusion which is spaced from the plane of the lamination from which the deep drawn pocket has S been deformed. Each deep drawn pocket is domed and its outer surface is smooth. It follows that the surface formed by each of the separators l l and the material of the respective lamination which surrounds that protrusion is continuous and uninterrupted. The cross-section of each deep drawn pocket, which is shown hatched in Figure 2 is designed to suit the optimum lamination material flow during the drawing process in combination with the axial load capacity which the protrusion is designed to withstand in service. The depth from the contact surface 16 to the plane of lamination of each deep drawn pocket separator 11 is of the order of 2 I/' mm.
The exterior of each deep drawn pocket is naturally aerodynamic, as is illustrated in Figure 3. The electrically insulating resin with which the lamination with its regular pattern of deep drawn pocket separators 11 is coated during impregnation of the stator windings will fill the hollow interior of each of the deep drawn pocket separators 11. The number of deep drawn pocket separators 11 that are provided is determined by the required stability and the axial compressive load to which the stack of laminations that comprises the laminated staler is to be subjected in service. The filling of the hollow interior in each of the deep drawn pocket separators l l with the electrically insulating resin contributes to the stability, as does the provision of deep drawn pocket separators 11 close to the tip of each of the radially inwardly directed teeth 13 which counter the tendency for instability in the teeth 13 due to magnetostriction.
The depth of the gap formed between the juxtaposed laminations by the deep drawn pocket separators 11 is chosen having regard to the air flow through that gap that is required for the desired cooling effect. That gap can be the depth of one deep drawn pocket separator 11 as shown in Figure 4, where the contact surfaces 16 of the deep drawn pocket separators 11 abut the surface of a flat lamination 17. Where a larger gap 19 is required in the laminated stator 18 because of greater air flow demands, the contact surfaces 16 of the regular pattern of deep drawn pocket separators 11 formed in one, 21 of the spaced pair of laminations 21 and 22 may abut the contact surfaces 16 of a similar regular pattern of deep drawn pocket separators 11 formed in the juxtaposed lamination 22 on the other side of the gap 19 between the juxtaposed laminations 21 and 22 of the laminated stator 18 as shown in Figure 5. The naturally aerodynamic exterior form of the deep drawn pocket separators 11 and the regular pattern of those separators 11 enables uniform air flow to all areas of the laminated stator 18 within the space that is formed by the separators 11 between the juxtaposed laminations 21 and 22 in the middle of the laminated stator 18, despite the partial blocking off of some of that flow area by support bars, landing bars or frame structure.
Figures 6A and 6B illustrate a simple press tool 23 for forming one of the deep drawn pocket separators 11 in a sheet 24 of electrical steel which is cut out to form a lamination of the laminated stator. Figure 6A shows the press tool 23 has a movable platen 25 which is movable relative to a die 26 to clamp the sheet 24 of electrical steel therebetween. The die 26 has a recess 27 formed in its surface 28 against which the sheet 24 is clamped by the movable platen 25. The profile of the recess 27 is that of the exterior surface of a deep drawn pocket separator 11. The movable platen 25 is formed with a guide passage 29 opposite the recess 27 in the die 26. A press tool 31 is a sliding fit within the guide passage 29 whereby it is guided for rectilinear movement towards or away from the die 26.
The portions of the surface 28 of the die 26 that surround the recess 27 and the portions of the opposed surface 32 of the movable platen 25 on either side of the guide passage 29 are formed as hardened gripping surfaces. The end 33 of the press tool 31 nearer to the die 26 is profiled with the form of the interior of the deep drawn pocket separator 11 that is to be formed.
In operation, the sheet 24 is clamped between the hardened gripping surface portions of the opposed surfaces 28 and 32. The press tool 31 is urged towards the die 26 so as to deform the portion of the sheet 24 of electrical steel that is located between it and the die 26 and that is not gripped by the hardened surface portions of the opposed surfaces 28 and 32 and to draw that portion into the form of the deep drawn pocket separator 11 by urging that material into the recess 27 formed in the die 26 as is shown in Figure 6B. This process may be carried out cold if the dimensions of the sheet 24 of electrical steel and the depth of the deep drawn pocket separator 11 allows. However, it may be necessary for heat to be applied to affect the required degree of deep drawing. This may be achieved by electrically heating the die 26 and the press tool 31 as illustrated in Figure 7.
Alternatively, it may be achieved by the effect of friction caused by rotating the press tool 31 as it is urged into contact with the sheet 24 of electrical steel and whilst it deforms that sheet 24 of electrical steel urging it into the recess 27 of the die 26, the rotating press tool 31 frictionally engaging the sheet 24 of electrical steel to generate the heat necessary to effect the required degree of deformation as shown in Figure 8.
Figure 9 shows an alternative technique for forming the domed protrusions. A tool of tungsten carbide or other similar material is rotated with a profile which varies as the protrusion is formed in order to form a protrusion with a conical, hemi-spherical or other similar shape.
In Figure 9 the tool is mounted on an eccentric spindle, and is brought towards the lamination surface. As the tool first encounters the lamination surface its eccentricity is at a maximum. The eccentricity of the tool is then reduced as the protrusion is formed to a final substantially concentric position. The tool thus forms a path with is essentially spiral in nature, starting at the diameter of the base of the protrusion and ending at the centre.
As the tool contacts the metal surface, friction takes place and the metal will heat, assisting uniform deformation and flow under the pressure and force exerted by the tool.
The variables of speed, geometry, lubrication if any, and feed rate are controlled to obtain a protrusion of the required profile.
Claims (26)
1. A laminated structure of an electrical machine in which flow paths for cooling fluid are formed between juxtaposed laminations by spaced protrusions which are formed as integral parts of a respective one of the juxtaposed laminations and which act as separators to space the juxtaposed laminations one from the other wherein a surface formed by each of the protrusions is domed.
2. A laminated structure according to claim 1, wherein a surface formed by each of the protrusions and material of the respective lamination which surrounds that protrusion is continuous and uninterrupted.
3. A laminated structure according to claim 1 or 2, wherein that part of said surface of each protrusion which serves as a contact surface which abuts the other of the juxtaposed laminations is to space the juxtaposed laminations one from the other is smooth.
4. A laminated structure according to claim 2 or claim 3, wherein each protrusion is substantially frusto-conical, the smooth contact surface part being at the smaller diameter end of the frusto-conical part of the respective protrusion which is joined to the surrounding material of the respective lamination at its larger diameter end.
5. A laminated structure according to claim 4, wherein each protrusion is formed by deformation of material of the respective lamination to form a deep drawn pocket.
6. A laminated structure according to any of the preceding claims, wherein each protrusion has a hollow interior which is filled with electrically insulating material.
7. A laminated structure according to any one of claims I to 6 wherein that part of said surface which is formed by the respective protrusion is aerodynamic.
8. A laminated structure according to any one of claims 1 to 7, wherein those parts of the protrusions which serve as contact surfaces which abut the other of the juxtaposed laminations abut respective contact surfaces of similar protrusions formed in the other of the juxtaposed laminations.
9. A laminated structure according to any one of claims 1 to 7, wherein those parts of the protrusions which serve as contact surfaces which abut the other of the juxtaposed laminations abut a flat, undeformed part of the surface of said other of the juxtaposed laminations.
10. A laminated structure according to claim 9, wherein said other of the juxtaposed laminations is flat and undeformed.
11. A laminated structure according to any one of claims 1 to 10, which is provided with slots at spaced intervals along one edge within which electrical phase windings are to be wound, juxtaposed slots being separated from one another by tooth portions of the laminated structure, wherein each tooth portion of said one of the juxtaposed laminations has protrusions formed on it at or near to its tip.
12. A laminated structure according to any one of claims 1 to 11 wherein said spaced protrusions are arranged symmetrically in a regular pattern on said one of the juxtaposed laminations.
13. A method of forming separators which are for spacing juxtaposed laminations of laminated structure of an electrical machine to form flow paths for cooling fluid through the laminated structure, in which one of the juxtaposed laminations is deformed to form spaced protrusions which are to act as the separators, wherein each protrusion is formed so as to have a domed surface.
14. A method according to claim 13, wherein each protrusion is formed so that a surface formed by it and material of the respective lamination surround it is continuous and is uninterrupted.
15. A method according to claim 13 or 14, wherein each protrusion is formed by deep drawing using a press tool and a die.
16. A method according to claim 15, wherein the deep drawing process is a cold working process.
17. A method according to claim 15 wherein the deep drawing process is a hot working process.
18. A method according to claim 17 wherein the press tool and the die are heated.
19. A method according to claim 17, wherein the press tool and the die are heated electrically.
20. A method according to claim 17 wherein the heat for the hot drawing process is generated by frictional inter-engagement of the press tool and the work piece during the deep drawing process, the press tool being rotated relative to the work piece as it is advanced towards the die.
21. A method according to claim 13 or 14 wherein each protrusion is formed with a rotating tool having a variable eccentricity.
22. A method according to claim 21 wherein the degree of eccentricity of the rotating tool is reduced as the protrusion is formed.
23. A method according to claim 21 or 22 wherein heat is generated by frictional inter-engagement of the rotating tool and the lamination to assist deformation of the lamination.
S
24. A method according to any of claims 13 to 23, wherein each protrusion has a hollow interior, the method further comprising the step of filling the hollow interior with electrically insulating material.
25. A laminated structure substantially as described hereinbefore with reference to and as illustrated in Figures 1 to 3 and either Figure 4 or Figure 5 of the accompanying drawings.
26. A method of forming separators which are for spacing juxtaposed laminations of laminated structure of an electrical machine to form flow paths for cooling fluid through the laminated structure substantially as described hereinbefore with reference to Figure 6 or Figure 7 or Figure 8 or Figure 9.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB0423558.6A GB0423558D0 (en) | 2004-10-22 | 2004-10-22 | Laminated structure of an electrical machine with cooling fluid flow paths |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0521387D0 GB0521387D0 (en) | 2005-11-30 |
| GB2419475A true GB2419475A (en) | 2006-04-26 |
Family
ID=33485079
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB0423558.6A Ceased GB0423558D0 (en) | 2004-10-22 | 2004-10-22 | Laminated structure of an electrical machine with cooling fluid flow paths |
| GB0521387A Withdrawn GB2419475A (en) | 2004-10-22 | 2005-10-20 | Laminated structure of an electric machine with cooling fluid flow paths |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB0423558.6A Ceased GB0423558D0 (en) | 2004-10-22 | 2004-10-22 | Laminated structure of an electrical machine with cooling fluid flow paths |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB0423558D0 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007000636A1 (en) * | 2007-11-07 | 2009-05-14 | Alstom Technology Ltd. | Rotor for electrodynamic machine i.e. hydro generator, has spacing webs that are supported on rim bolts extending through sheet metal member of rotor in axial direction in order to absorb centrifugal forces that are applied to spacing webs |
| US7893577B2 (en) | 2007-03-30 | 2011-02-22 | Alstom Technology Ltd | Rotor for an electrodynamic machine |
| EP2509194A1 (en) * | 2011-04-04 | 2012-10-10 | Siemens Aktiengesellschaft | Generator for an electrical machine |
| EP3425772A1 (en) * | 2017-07-03 | 2019-01-09 | GE Energy Power Conversion Technology Limited | Rotary electrical machine comprising a stator and a rotor |
| CN109802524A (en) * | 2019-03-21 | 2019-05-24 | 哈尔滨理工大学 | A kind of Wound brushless double-feeding motor with novel cooling structure |
| WO2022027934A1 (en) * | 2020-08-07 | 2022-02-10 | 浙江盘毂动力科技有限公司 | Disc-type electric motor, stator, and cooling pipeline for intertooth cooling of axial magnetic field electric motor stator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US831625A (en) * | 1905-04-18 | 1906-09-25 | Cons Car Heating Co | Ventilated armature. |
| JPS58165640A (en) * | 1982-03-26 | 1983-09-30 | Toshiba Corp | Laminated core of rotary electric machine |
-
2004
- 2004-10-22 GB GBGB0423558.6A patent/GB0423558D0/en not_active Ceased
-
2005
- 2005-10-20 GB GB0521387A patent/GB2419475A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US831625A (en) * | 1905-04-18 | 1906-09-25 | Cons Car Heating Co | Ventilated armature. |
| JPS58165640A (en) * | 1982-03-26 | 1983-09-30 | Toshiba Corp | Laminated core of rotary electric machine |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7893577B2 (en) | 2007-03-30 | 2011-02-22 | Alstom Technology Ltd | Rotor for an electrodynamic machine |
| DE102007000636A1 (en) * | 2007-11-07 | 2009-05-14 | Alstom Technology Ltd. | Rotor for electrodynamic machine i.e. hydro generator, has spacing webs that are supported on rim bolts extending through sheet metal member of rotor in axial direction in order to absorb centrifugal forces that are applied to spacing webs |
| EP2509194A1 (en) * | 2011-04-04 | 2012-10-10 | Siemens Aktiengesellschaft | Generator for an electrical machine |
| EP3425772A1 (en) * | 2017-07-03 | 2019-01-09 | GE Energy Power Conversion Technology Limited | Rotary electrical machine comprising a stator and a rotor |
| US10998794B2 (en) | 2017-07-03 | 2021-05-04 | Ge Energy Power Conversion Technology Ltd | Rotating electrical machine comprising asymmetrical heat exchange pins |
| CN109802524A (en) * | 2019-03-21 | 2019-05-24 | 哈尔滨理工大学 | A kind of Wound brushless double-feeding motor with novel cooling structure |
| WO2022027934A1 (en) * | 2020-08-07 | 2022-02-10 | 浙江盘毂动力科技有限公司 | Disc-type electric motor, stator, and cooling pipeline for intertooth cooling of axial magnetic field electric motor stator |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0521387D0 (en) | 2005-11-30 |
| GB0423558D0 (en) | 2004-11-24 |
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