CA1095108A - Insulating transverse slot spring for dynamoelectric machine - Google Patents
Insulating transverse slot spring for dynamoelectric machineInfo
- Publication number
- CA1095108A CA1095108A CA293,751A CA293751A CA1095108A CA 1095108 A CA1095108 A CA 1095108A CA 293751 A CA293751 A CA 293751A CA 1095108 A CA1095108 A CA 1095108A
- Authority
- CA
- Canada
- Prior art keywords
- slot
- spring
- width
- key
- length
- 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
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/48—Fastening of windings on the stator or rotor structure in slots
Abstract
case 2582 ABSTRACT OF THE DISCLOSURE
A slot closure for a dynamoelectric machine having a spring between the slot closing key and the outer conductor in the slot to apply and maintain a spring force to assist in retaining the conductors securely. The spring has a width substantially the width of the slot and a length at least several times the width. The spring is made with a transverse curvature to provide the spring action. The spring, when wedged between the key and the outer conductor, provides a substantially continuous line loading along the length of the slot rather than a spaced or interrupted loading.
A slot closure for a dynamoelectric machine having a spring between the slot closing key and the outer conductor in the slot to apply and maintain a spring force to assist in retaining the conductors securely. The spring has a width substantially the width of the slot and a length at least several times the width. The spring is made with a transverse curvature to provide the spring action. The spring, when wedged between the key and the outer conductor, provides a substantially continuous line loading along the length of the slot rather than a spaced or interrupted loading.
Description
case 2582 This invention relates to an improved slot closure for a dynamoelectric machine, and in particular it relates to an improved slot closure which uses a transverse spring to provide a spring action to hold conductors firmly in a slot.
In larger dynamoelectric machines there are slots formed in a laminated stack of iron sheets to receive winding conductors. The conductors are installed in these slots and they must be held firmly in place against mechanical and elec-tromagnetic forces which tend to cause movement. The slots are usually formed with a dove-tail adjacent the slot mouth or slot opening and a key of mating configuration with the dove-tail is pressed into the dove-tail to close the slot. Shims are frequently used between the key and the conductors to wedge the conductors in place and thereby prevent movement of the conductors.
Conductors used in larger dynamoelectric machines usually have a jacket formed of a thermosetting resinous ma-terial impregnating a porous material and this is cured to a hard state forming the insulating jacket around the conductor.
In addition there may be portions oE the jacket coated with a partially conducting elastomer to reduce the possibility of voids developing between the conductors and the slot walls which might cause corona problems. When these conductors are first installed they are very firmly wedged into their slots and are satisfac-torily restrained against movement. However, with time thepossibility of decreasing restraining forces has been a problem.
Repeated thermal cycling may permit some flowing of the jacket surrounding the conductors or there may be some shrinkage. The present machines may carry considerable currents in the conduc-tors and the electromagnetic forces can be quite large. Thismay aid in decreasing the restraining forces by causin~ large ;
. . . : .
- :-Case 2582 stresses. To reduce the possibility of restraining forces decreasing with time, it is known to use spring forces be~ween the key and the conductors.
various forms and arrangements o~ springs have been devised ~or providing a spring action or spring ~orce between a slot key and the conductors in the slot. One prior art arrangement is shown, for example, in Canadian Patent No.
980 398 to Robert S. Brown and Robert Hawley, issued December 23, 1975. This patent describes two wedge members with opposite tapers extending longitudinally of the wedge members. The two wedge members are pressed into a slot so that they exert a pressure or cause a wedging action between the conductors in that slot and the slot key. A cooperating spring is also installed in the slot to ensure a firm pressure by its spring action even i~
there is a slight decrease in the wedging pressure. The spring member is in the form of an extended rectangle with transversely extending ripples or deformations to give it the spring action.
Another prior art arrangement is shown in United States Patent No. 3 976 901 to Gabor Liptak and Roland Schuler, issued August 24, 1976. This patent describes a plurality of ring-shaped disc springs, each in the form of a truncated cone - with a diameter substantially equal to the width of the slot.
These disc springs are inserted between the conductors and the key prior to the installation of the key and they provide a spring action between the conductors and the key.
The prior art spring arrangements tend to provide, along the length of the slot, a discontinuous force or loading.
The present invention is directed to a spring arrangement which provides a substcmtially continuous line loading along the length of the slot, and this substantially continuous loading is believed to be preferable~
. :
Case 2582 It is thereEore a feature of the present invention to provide an improved slot closure for a dynamoelectric machine that makes use of a -transverse sprlng providing spring action with continuous line contact along the length of the slot.
According to the invention there is provided in a dynamoelectric machine having a stack of laminations in which slots are provided extending substantially longitudinally of said machine for holding conductors, each slot having a dove-tail configuration adjacent the entrance thereto and a plur-ality of slot keys for closing the slots, the slot keys having complementary surfaces to said dove-tail configuration for engagement with the surfaces of said dove-tail configuration to retain the keys in position closing the slots, the improvement comprising a spring in said slot between the key and the conductor adjacent the slot entrance, said spring having a width slightly less than the width of said slot and a length extending longitudinally of said slot for at least several times the width, and a curvature in said spring extending transversely to provide a spring force between said key and said conductor extending substantially continuously along the length of said slot to maintain the winding conductors in position with a compressive force.
The invention will be described with reference to the drawings, in which Figure 1 is a cross-sectional view taken across a slot of a dynamoelectric machine showing conductors in the slot and a slot c:losing key, Figure 2 is a cross-sectional view taken along line 2 - 2 of Fis~ure 1, and Figure 3 is an isometric view of the transverse spring according to the invention.
, Case 25~2 Referring primarily to Figures 1 and 2, there is shown a conductor slot 10 in laminations l:L of a dynamoelectric machine. The conductor slot 10 is one of a series or plurality of slots formed by punching the laminations. The laminations are stacked adjacent to one another to form the slot which extends substantially longitudinal]y of the dynamoelectric machine. A conductor bar 12 is shown having several conductors 14 surrounded by an insulating jacket 15. ~acket 15 may be formed for example, by wrapping conductors 14 with a porous material such as a fiberglass cloth and impregnating the material with a thermosetting resin. Depending on the design requirements there may be two or more conductor bars in each slot. Figure 1 shows slot 10 with one complete conductor bar illustrated and with a portion of the jacket of an adjacent bar.
A top filler strip 16 is in engagement with the surface of jacket 15 nearest the opening of slot 10. A key 17 is mounted in the slot opening to close it. The key 17 has sloping edges 18 that mate with sloping sides 20 of the walls of slot 10 adjacent the slot opening. There is a groove 21 on the inside of key 17. Groove 21 has a rectangular cross-section and the wide surface has a taper or slope extending in the longitudinal direction. A wedge 22-is positioned in groove 21.
Wedge 22 has a longitudinally extending taper on one side which is substantially the same slope as onthe groove. The engaging tapered surfaces of groove 21 and wedge 22 are oppo-sitely directed or mating to provide an adjustable wedging action.
The key 17 is made in relatively short lengths, for example of the order of perhaps 3 or 4 inches to 8 inches in length for slot widths of the order of 3/4 to 1~ inches.
The length dimensions may be greater or less than those .~ .
: ~ .
..
Case 2582 3~
indicated as required by the size of the slot and other design considerations. There are, of course, a sufficient number of keys 17 to close slot 10 along its entire length. The wedges 22 are shorter in length than the key 17 to permit some adjust-ment without the wedge extending beyond the respective key.
Between the wedge 22 and the filler strip 16 is a transverse spring 23. Spring 23 is perhaps best seen in Figure 3 and is a lonyitudinally extending spring with a curve extending transversely of slot 10 to provide a spring action. Spring 23 has a width substantially the same as the width of slot lO
(its width is slightly less than that of slot ]0 to provide some clearance) and its length is preferably several times the length of a key and at least is several times the width of the spring.
The spring 23 may be made of any spring material but a preferred material is several layers of glass cloth im-pregnated with a thermosetting resinous material, for example, four or five layers of woven glass cloth impregnated with a heat resistant, thermosetting, polyester type, laminating resin and cured in a mould under the influence of heat and pressure.
It is desirable that the set or relaxation of the spring as it ages be kept to a minimum to maintain as high a spring pressure as possible.
; The following relationship may be used as a guide when designing and making a transverse spring = E~t where ~ = bending stress E = Young~s Modulus t a thickness R = radius of curvature of spring.
'',', -,' : ' '' . ~
Case 2582 ~A,~S~
When a particular material is selected for the spring, and the selected mat~rial should have a low set, then E and ~ are known. Thickness and radius of curvature must then be chosen to fulfill, at least approximately, the equation while remaining within the practical limits for a suitable spring. For example, ~or most springs the radius o~ curvature will-be within the range of 1.5 to 3 times slot width, and it will be apparent that too small a thickness will result in a spring so flexible it cannot apply an adequate force within the slot and too great a thickness will result in a spring that is difficult to deform or flex at all.
When a dynamoelectric machine is being assembled, ; after the conductor bars are pressed into the slot, the top filler strip 16 is placed on the exposed surface of the jacket 15 of the top conductor bar 12. The transverse spring 23 is put in position and the keys 17 are slid into position one at a time. When a key 17 is in position its associated wedge 22 is tapped into place beneath it to give a desired wedging force. A small amount of adhesive is normally used between key 17 and the associated wedge 22 so that it will not shift once it is installed. When one key and wedge are completed the next adjacent key is slid into position and the associated wedge tapped into place. This is continued until the slot is filled.
By way of example, a transverse spring was made for a machine having a slot width of one inch of five layers of cloth impregnated with a thermosetting polyester resin and having a thickness of 0.045 inches. The spring was made with a radius of curvature of 2.1 inches and with a length of 36 inches and a width of approximately one inch.
It is believed that the line force provided by . .
Case 2582 the transverse spring of this invention is desirable as the restraining force is applied continuously along the slot.
It is, of cours~, possible to use different wedging methods, such as are provided for example by two oppositely tapered wedges beneath a key.
In larger dynamoelectric machines there are slots formed in a laminated stack of iron sheets to receive winding conductors. The conductors are installed in these slots and they must be held firmly in place against mechanical and elec-tromagnetic forces which tend to cause movement. The slots are usually formed with a dove-tail adjacent the slot mouth or slot opening and a key of mating configuration with the dove-tail is pressed into the dove-tail to close the slot. Shims are frequently used between the key and the conductors to wedge the conductors in place and thereby prevent movement of the conductors.
Conductors used in larger dynamoelectric machines usually have a jacket formed of a thermosetting resinous ma-terial impregnating a porous material and this is cured to a hard state forming the insulating jacket around the conductor.
In addition there may be portions oE the jacket coated with a partially conducting elastomer to reduce the possibility of voids developing between the conductors and the slot walls which might cause corona problems. When these conductors are first installed they are very firmly wedged into their slots and are satisfac-torily restrained against movement. However, with time thepossibility of decreasing restraining forces has been a problem.
Repeated thermal cycling may permit some flowing of the jacket surrounding the conductors or there may be some shrinkage. The present machines may carry considerable currents in the conduc-tors and the electromagnetic forces can be quite large. Thismay aid in decreasing the restraining forces by causin~ large ;
. . . : .
- :-Case 2582 stresses. To reduce the possibility of restraining forces decreasing with time, it is known to use spring forces be~ween the key and the conductors.
various forms and arrangements o~ springs have been devised ~or providing a spring action or spring ~orce between a slot key and the conductors in the slot. One prior art arrangement is shown, for example, in Canadian Patent No.
980 398 to Robert S. Brown and Robert Hawley, issued December 23, 1975. This patent describes two wedge members with opposite tapers extending longitudinally of the wedge members. The two wedge members are pressed into a slot so that they exert a pressure or cause a wedging action between the conductors in that slot and the slot key. A cooperating spring is also installed in the slot to ensure a firm pressure by its spring action even i~
there is a slight decrease in the wedging pressure. The spring member is in the form of an extended rectangle with transversely extending ripples or deformations to give it the spring action.
Another prior art arrangement is shown in United States Patent No. 3 976 901 to Gabor Liptak and Roland Schuler, issued August 24, 1976. This patent describes a plurality of ring-shaped disc springs, each in the form of a truncated cone - with a diameter substantially equal to the width of the slot.
These disc springs are inserted between the conductors and the key prior to the installation of the key and they provide a spring action between the conductors and the key.
The prior art spring arrangements tend to provide, along the length of the slot, a discontinuous force or loading.
The present invention is directed to a spring arrangement which provides a substcmtially continuous line loading along the length of the slot, and this substantially continuous loading is believed to be preferable~
. :
Case 2582 It is thereEore a feature of the present invention to provide an improved slot closure for a dynamoelectric machine that makes use of a -transverse sprlng providing spring action with continuous line contact along the length of the slot.
According to the invention there is provided in a dynamoelectric machine having a stack of laminations in which slots are provided extending substantially longitudinally of said machine for holding conductors, each slot having a dove-tail configuration adjacent the entrance thereto and a plur-ality of slot keys for closing the slots, the slot keys having complementary surfaces to said dove-tail configuration for engagement with the surfaces of said dove-tail configuration to retain the keys in position closing the slots, the improvement comprising a spring in said slot between the key and the conductor adjacent the slot entrance, said spring having a width slightly less than the width of said slot and a length extending longitudinally of said slot for at least several times the width, and a curvature in said spring extending transversely to provide a spring force between said key and said conductor extending substantially continuously along the length of said slot to maintain the winding conductors in position with a compressive force.
The invention will be described with reference to the drawings, in which Figure 1 is a cross-sectional view taken across a slot of a dynamoelectric machine showing conductors in the slot and a slot c:losing key, Figure 2 is a cross-sectional view taken along line 2 - 2 of Fis~ure 1, and Figure 3 is an isometric view of the transverse spring according to the invention.
, Case 25~2 Referring primarily to Figures 1 and 2, there is shown a conductor slot 10 in laminations l:L of a dynamoelectric machine. The conductor slot 10 is one of a series or plurality of slots formed by punching the laminations. The laminations are stacked adjacent to one another to form the slot which extends substantially longitudinal]y of the dynamoelectric machine. A conductor bar 12 is shown having several conductors 14 surrounded by an insulating jacket 15. ~acket 15 may be formed for example, by wrapping conductors 14 with a porous material such as a fiberglass cloth and impregnating the material with a thermosetting resin. Depending on the design requirements there may be two or more conductor bars in each slot. Figure 1 shows slot 10 with one complete conductor bar illustrated and with a portion of the jacket of an adjacent bar.
A top filler strip 16 is in engagement with the surface of jacket 15 nearest the opening of slot 10. A key 17 is mounted in the slot opening to close it. The key 17 has sloping edges 18 that mate with sloping sides 20 of the walls of slot 10 adjacent the slot opening. There is a groove 21 on the inside of key 17. Groove 21 has a rectangular cross-section and the wide surface has a taper or slope extending in the longitudinal direction. A wedge 22-is positioned in groove 21.
Wedge 22 has a longitudinally extending taper on one side which is substantially the same slope as onthe groove. The engaging tapered surfaces of groove 21 and wedge 22 are oppo-sitely directed or mating to provide an adjustable wedging action.
The key 17 is made in relatively short lengths, for example of the order of perhaps 3 or 4 inches to 8 inches in length for slot widths of the order of 3/4 to 1~ inches.
The length dimensions may be greater or less than those .~ .
: ~ .
..
Case 2582 3~
indicated as required by the size of the slot and other design considerations. There are, of course, a sufficient number of keys 17 to close slot 10 along its entire length. The wedges 22 are shorter in length than the key 17 to permit some adjust-ment without the wedge extending beyond the respective key.
Between the wedge 22 and the filler strip 16 is a transverse spring 23. Spring 23 is perhaps best seen in Figure 3 and is a lonyitudinally extending spring with a curve extending transversely of slot 10 to provide a spring action. Spring 23 has a width substantially the same as the width of slot lO
(its width is slightly less than that of slot ]0 to provide some clearance) and its length is preferably several times the length of a key and at least is several times the width of the spring.
The spring 23 may be made of any spring material but a preferred material is several layers of glass cloth im-pregnated with a thermosetting resinous material, for example, four or five layers of woven glass cloth impregnated with a heat resistant, thermosetting, polyester type, laminating resin and cured in a mould under the influence of heat and pressure.
It is desirable that the set or relaxation of the spring as it ages be kept to a minimum to maintain as high a spring pressure as possible.
; The following relationship may be used as a guide when designing and making a transverse spring = E~t where ~ = bending stress E = Young~s Modulus t a thickness R = radius of curvature of spring.
'',', -,' : ' '' . ~
Case 2582 ~A,~S~
When a particular material is selected for the spring, and the selected mat~rial should have a low set, then E and ~ are known. Thickness and radius of curvature must then be chosen to fulfill, at least approximately, the equation while remaining within the practical limits for a suitable spring. For example, ~or most springs the radius o~ curvature will-be within the range of 1.5 to 3 times slot width, and it will be apparent that too small a thickness will result in a spring so flexible it cannot apply an adequate force within the slot and too great a thickness will result in a spring that is difficult to deform or flex at all.
When a dynamoelectric machine is being assembled, ; after the conductor bars are pressed into the slot, the top filler strip 16 is placed on the exposed surface of the jacket 15 of the top conductor bar 12. The transverse spring 23 is put in position and the keys 17 are slid into position one at a time. When a key 17 is in position its associated wedge 22 is tapped into place beneath it to give a desired wedging force. A small amount of adhesive is normally used between key 17 and the associated wedge 22 so that it will not shift once it is installed. When one key and wedge are completed the next adjacent key is slid into position and the associated wedge tapped into place. This is continued until the slot is filled.
By way of example, a transverse spring was made for a machine having a slot width of one inch of five layers of cloth impregnated with a thermosetting polyester resin and having a thickness of 0.045 inches. The spring was made with a radius of curvature of 2.1 inches and with a length of 36 inches and a width of approximately one inch.
It is believed that the line force provided by . .
Case 2582 the transverse spring of this invention is desirable as the restraining force is applied continuously along the slot.
It is, of cours~, possible to use different wedging methods, such as are provided for example by two oppositely tapered wedges beneath a key.
Claims (5)
1. In a dynamoelectric machine having a stack of laminations in which slots are provided extending substantially longitudinally of said machine for holding conductors, each slot having a dove-tail configuration adjacent the entrance thereto and a plurality of slot keys for closing the slots, the slot keys having complementary surfaces to said dove-tail configuration for engagement with the surfaces of said dove-tail configuration to retain the keys in position closing the slots, the improvement comprising a spring in said slot between the key and the conductor adjacent the slot entrance, said spring having a width slightly less than the width of said slot and a length extending longitudinally of said slot for at least several times the width, and a pre-formed curvature in said spring extending transversely to provide a spring force between said key and said conductor which extends substantially continuously along the length of said slot to maintain the winding conductors in position with a compressive force.
2. A dynamoelectric machine as defined in claim 1 wherein said spring is of insulating material.
3. A dynamoelectric machine as defined in claim 2 wherein said spring is made of a plurality of layers of woven glass cloth impregnated with a cured thermosetting polyester resin.
4. A dynamoelectric machine as defined in any of claims 1, 2 or 3 wherein said pre-formed curvature in said spring has a radius between about 1.5 and 3.0 times the width of said slot.
5. A spring for mounting in the slot of a dynamo-electric machine to provide a force between a slot closing key at the entrance to a slot in said machine and a conductor in said slot, said spring having a width slightly less than the width Case 2582
5. A spring for mounting in the slot of a dynamo-electric machine to provide a force between a slot closing key at the entrance to a slot in said machine and a conductor in said slot, said spring having a width slightly less than the width Case 2582
Claim 5 (continued) of said slot and a length at least several times said width, and a pre-formed curvature in said spring to provide said force, said curvature extending transversely of said spring, whereby said force is provided in a line extending substan-tially continuously along the length of the slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA293,751A CA1095108A (en) | 1977-12-22 | 1977-12-22 | Insulating transverse slot spring for dynamoelectric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA293,751A CA1095108A (en) | 1977-12-22 | 1977-12-22 | Insulating transverse slot spring for dynamoelectric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1095108A true CA1095108A (en) | 1981-02-03 |
Family
ID=4110367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA293,751A Expired CA1095108A (en) | 1977-12-22 | 1977-12-22 | Insulating transverse slot spring for dynamoelectric machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1095108A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4469971A (en) * | 1982-11-18 | 1984-09-04 | Canadian General Electric Company, Ltd. | Stator slot wedge assembly with axial spring retainer |
| US4547690A (en) * | 1983-12-21 | 1985-10-15 | Canadian General Electric Co., Ltd. | Flexible stator slot closure arrangement |
| US4584497A (en) * | 1984-09-28 | 1986-04-22 | General Electric Company | Beam support for bar windings of large electric generator |
| US4739207A (en) * | 1987-02-20 | 1988-04-19 | Westinghouse Electric Corp. | Wedge locking device in a radially ventilated rotor |
| EP0379012A2 (en) * | 1989-01-17 | 1990-07-25 | Siemens Aktiengesellschaft | Method for manufacturing the stator of a large electric machine |
| US4994700A (en) * | 1990-02-15 | 1991-02-19 | Sundstrand Corporation | Dynamoelectric machine oil-cooled stator winding |
| EP0468784A2 (en) * | 1990-07-26 | 1992-01-29 | General Electric Company | Electrical machine, rotor therefor, and method of assembly |
| FR2708803A1 (en) * | 1993-07-30 | 1995-02-10 | Jeumont Ind | Rotating jacketed machine. |
| EP1168573A2 (en) * | 2000-05-31 | 2002-01-02 | Kabushiki Kaisha Toshiba | Stator coil support device for electric rotating machinery |
-
1977
- 1977-12-22 CA CA293,751A patent/CA1095108A/en not_active Expired
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4469971A (en) * | 1982-11-18 | 1984-09-04 | Canadian General Electric Company, Ltd. | Stator slot wedge assembly with axial spring retainer |
| US4547690A (en) * | 1983-12-21 | 1985-10-15 | Canadian General Electric Co., Ltd. | Flexible stator slot closure arrangement |
| US4633574A (en) * | 1983-12-21 | 1987-01-06 | Canadian General Electric Co., Ltd. | Method for securing conductor bar in machine slot while closing slot |
| US4584497A (en) * | 1984-09-28 | 1986-04-22 | General Electric Company | Beam support for bar windings of large electric generator |
| US4739207A (en) * | 1987-02-20 | 1988-04-19 | Westinghouse Electric Corp. | Wedge locking device in a radially ventilated rotor |
| EP0379012A3 (en) * | 1989-01-17 | 1992-02-19 | Siemens Aktiengesellschaft | Method for manufacturing the stator of a large electric machine |
| EP0379012A2 (en) * | 1989-01-17 | 1990-07-25 | Siemens Aktiengesellschaft | Method for manufacturing the stator of a large electric machine |
| US4994700A (en) * | 1990-02-15 | 1991-02-19 | Sundstrand Corporation | Dynamoelectric machine oil-cooled stator winding |
| EP0468784A2 (en) * | 1990-07-26 | 1992-01-29 | General Electric Company | Electrical machine, rotor therefor, and method of assembly |
| EP0468784A3 (en) * | 1990-07-26 | 1992-04-15 | General Electric Company | Electrical machine, rotor therefor, and method of assembly |
| US5122698A (en) * | 1990-07-26 | 1992-06-16 | General Electric Company | Apparatus affording efficient electrical contact between rotor surface current carrying parts at low speeds for a turbo-electric machine |
| FR2708803A1 (en) * | 1993-07-30 | 1995-02-10 | Jeumont Ind | Rotating jacketed machine. |
| EP1168573A2 (en) * | 2000-05-31 | 2002-01-02 | Kabushiki Kaisha Toshiba | Stator coil support device for electric rotating machinery |
| EP1168573A3 (en) * | 2000-05-31 | 2002-12-11 | Kabushiki Kaisha Toshiba | Stator coil support device for electric rotating machinery |
| US6580192B2 (en) | 2000-05-31 | 2003-06-17 | Kabushiki Kaisha Toshiba | Stator coil support device for electric rotating machinery |
| EP1480314A2 (en) * | 2000-05-31 | 2004-11-24 | Kabushiki Kaisha Toshiba | Stator coil support device for electric rotating machinery |
| EP1480313A2 (en) * | 2000-05-31 | 2004-11-24 | Kabushiki Kaisha Toshiba | Stator coil support device for electric rotating machinery |
| EP1480314A3 (en) * | 2000-05-31 | 2004-12-15 | Kabushiki Kaisha Toshiba | Stator coil support device for electric rotating machinery |
| EP1480313A3 (en) * | 2000-05-31 | 2004-12-15 | Kabushiki Kaisha Toshiba | Stator coil support device for electric rotating machinery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |