CA1058676A - Rotor of a dynamo electric machine - Google Patents
Rotor of a dynamo electric machineInfo
- Publication number
- CA1058676A CA1058676A CA260,113A CA260113A CA1058676A CA 1058676 A CA1058676 A CA 1058676A CA 260113 A CA260113 A CA 260113A CA 1058676 A CA1058676 A CA 1058676A
- Authority
- CA
- Canada
- Prior art keywords
- rotor
- slots
- iron core
- coils
- passages
- 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
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- Motor Or Generator Cooling System (AREA)
- Windings For Motors And Generators (AREA)
Abstract
TITLE OF THE INVENTION
A ROTOR OF A DYNAMO ELECTRIC MACHINE
ABSTRACT OF THE DISCLOSURE
A rotor of a dynamo electric machine, in which, for cooling the windings wound on the rotor of the dynamo electric machine, passages for cooling, which conduct cooling gas from the winding parts, projecting to the outside from the ends of the rotor, into the respective windings, conduct the cooling gas through passages provided in the respective windings to the vicinity of the middle of the rotor, and conduct it in passages extending in a radial direction in the rotor and discharge it from the rotor surface, and respective sub-slots along the bottom of each slot of the rotor are provided, passages being provided by which cooling gas for the windings, which has flowed in from both ends of these sub-slots,is made to flow through passages formed in a radial direction in the middle part of the rotor, to be discharged from the rotor surface.
A ROTOR OF A DYNAMO ELECTRIC MACHINE
ABSTRACT OF THE DISCLOSURE
A rotor of a dynamo electric machine, in which, for cooling the windings wound on the rotor of the dynamo electric machine, passages for cooling, which conduct cooling gas from the winding parts, projecting to the outside from the ends of the rotor, into the respective windings, conduct the cooling gas through passages provided in the respective windings to the vicinity of the middle of the rotor, and conduct it in passages extending in a radial direction in the rotor and discharge it from the rotor surface, and respective sub-slots along the bottom of each slot of the rotor are provided, passages being provided by which cooling gas for the windings, which has flowed in from both ends of these sub-slots,is made to flow through passages formed in a radial direction in the middle part of the rotor, to be discharged from the rotor surface.
Description
~ 1058676 A ROTOR OF A DYNAMO ELECTRIC MACHINE ¦
BACKGROUND OF THE INVENTION
Field of the Invention: ¦
This invention relates to a rotor of a dynamo electric machine, and more particularly to improvements in the cooling structure of the - windings wound on the rotor of a dynamo electric machine.
Description of the Prior Art:
As regards the cooling structure of the windings wound on a rotor of a dynamo electric machine, cooling gas is conducted from winding parts, projecting from the ends of the rotor, into the interior of the respective windings, and the cooling gas which has been introduced flows through the interior of the respective windings and cools them. The cooling gas which has been used for cooling absorbs heat so that its temperature rises and its cooling capacity is lowered. The cooling gas of which the temperature has risen travels through passages formed in a radial direction with respect to the rotor, in the middle part of the rotor, and is dis-charged to the outside from the surface of the rotor.
But, in rotors having this cooling structure, the temperature of the cooling gas led into the windings from the rotor ends rises as the gas flows to the middle of the rotor, and although the cooling of the windings located near the ends of the rotor is carried out effectively, the windings located in the middle part of the rotor are not cooled
BACKGROUND OF THE INVENTION
Field of the Invention: ¦
This invention relates to a rotor of a dynamo electric machine, and more particularly to improvements in the cooling structure of the - windings wound on the rotor of a dynamo electric machine.
Description of the Prior Art:
As regards the cooling structure of the windings wound on a rotor of a dynamo electric machine, cooling gas is conducted from winding parts, projecting from the ends of the rotor, into the interior of the respective windings, and the cooling gas which has been introduced flows through the interior of the respective windings and cools them. The cooling gas which has been used for cooling absorbs heat so that its temperature rises and its cooling capacity is lowered. The cooling gas of which the temperature has risen travels through passages formed in a radial direction with respect to the rotor, in the middle part of the rotor, and is dis-charged to the outside from the surface of the rotor.
But, in rotors having this cooling structure, the temperature of the cooling gas led into the windings from the rotor ends rises as the gas flows to the middle of the rotor, and although the cooling of the windings located near the ends of the rotor is carried out effectively, the windings located in the middle part of the rotor are not cooled
-2-1058~76 satisfactorily, and they undergo a great rise in temperature as compared with the temperature of the windings at the ends. This fact leads to overheating of the windings in the middle part of the rotor of the dynamo electric machine and causes reduction of the insulating capacity of the insulating material and destruction of this material, and, in the worst cases, gives rise to local burning.
Also, if the design is such that the temperature of the middle part of the rotor is kept at a permissible value, it is only possible to make a dynamo electric machine of which the capacity is small in relation to the dimensions of the machine, and efficient use of the materials is thus impossible.
SUMMARY OF_THE INVENTION
Accordingly, the main object of this invention is to provide a rotor of a dynamo electric machine having a cooling structure which enables the cooling of the windings of the rotor of the dynamo electric machine in the middle part of the rotor to be carried out effectively and the value of the temperature increase of these windings to be kept low.
Another object of this invention is to provide a rotor of a dynamo electric machine in which, as far as possible, the cooling structure of the rotor windings does not lower the mechanical strength of the rotor, and the structure is such that manufacture can be carried out easily.
That is to say, to describe this invention simply, it is a rotor of a dynamo electric machine, comprising a plurality of slots provided in the outside of the iron core of the rotor and extending in the axial direction, a plurality of coils accommodated in these slots, a plurality of sub-slots provided in the bottoms of the slots, a plurality of coil-slots provided in the coils, first passages providing communication between the coil slots and a middle surface of the iron core of the rotor, and second passages providing communication between the sub-slots and the middle surface of the iron core.
BRIEF DESCRIPTION OF THE DRAWINGS
Yarious other objects, features and attendant advantages of the present invention will be more fully appreciated as the same becomes better understood from the following detailed description, when considered with the accompanying drawings in which like reference numerals designate like lS or corresponding parts throughout the several views, and in which:
FIGURE 1 is an oblique view of an embodiment of a rotor of a dynamo electric machine formed in accordance with the present invention, having a part cut away so as to show the internal structure thereof;
FIGURE 2 is a sectional view of the middle part of the rotor, taken along the line A - A of Figure 1 and seen in the direction of the arrows t e ~of:
FIGURE 3 is a sectional view of the rotor, taken along the line B - B of Figure 2 and seen in the direction of the arrows thereof;
FIGURE 4 is a sectional view of the rotor, taken along the line C - C of Figure 2 and seen in the direction of the arrows thereof;
FIGURE 5 is a diagram showing the state of flow of the cooling gas in the rotor of Figure l;
FIGURE 6 is a characteristic curve diagram showing the values of the temperature increase of the windings of a rotor in accordance with the present invention and the values of the temperature increase of the windings of a rotor having the former cooling structure; and FIGURE 7 is a diagram showing the state of flow of the cooling gas in the interior of a rotor in accordance with another embodiment of this invention, appearing with Figure 5.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings and more particularly to Figures 1 and 2 thereof, sub-slots 1 are provided in the bottoms of slots 4 accommodating coils 3 provided on the outer periphery of an iron core 12 of a rotor. The sub-slots 1 extend along the entire length of the slots 4 and communicate with passages 2 which are formed in the coils 3 located 2~ in the middle part of the iron core 12 of the rotor and which extend .. ... , _. . _ , 105867~
in a radial direction with respect to the rotor. The structure of the rotor is such that it is symmetrical about its longitudinal center.
As shown in Figures 3 and 4, a coil 3 accommodated in a slot 4 is made up of a plurality of coil element wires superimposed on one an-other, and insulating plates 5 are interposed between the coil element wires so as to provide insulation therefor. A mat 6a of insulating material is placed at the bottom of the slot 4, and the outside of the coil
Also, if the design is such that the temperature of the middle part of the rotor is kept at a permissible value, it is only possible to make a dynamo electric machine of which the capacity is small in relation to the dimensions of the machine, and efficient use of the materials is thus impossible.
SUMMARY OF_THE INVENTION
Accordingly, the main object of this invention is to provide a rotor of a dynamo electric machine having a cooling structure which enables the cooling of the windings of the rotor of the dynamo electric machine in the middle part of the rotor to be carried out effectively and the value of the temperature increase of these windings to be kept low.
Another object of this invention is to provide a rotor of a dynamo electric machine in which, as far as possible, the cooling structure of the rotor windings does not lower the mechanical strength of the rotor, and the structure is such that manufacture can be carried out easily.
That is to say, to describe this invention simply, it is a rotor of a dynamo electric machine, comprising a plurality of slots provided in the outside of the iron core of the rotor and extending in the axial direction, a plurality of coils accommodated in these slots, a plurality of sub-slots provided in the bottoms of the slots, a plurality of coil-slots provided in the coils, first passages providing communication between the coil slots and a middle surface of the iron core of the rotor, and second passages providing communication between the sub-slots and the middle surface of the iron core.
BRIEF DESCRIPTION OF THE DRAWINGS
Yarious other objects, features and attendant advantages of the present invention will be more fully appreciated as the same becomes better understood from the following detailed description, when considered with the accompanying drawings in which like reference numerals designate like lS or corresponding parts throughout the several views, and in which:
FIGURE 1 is an oblique view of an embodiment of a rotor of a dynamo electric machine formed in accordance with the present invention, having a part cut away so as to show the internal structure thereof;
FIGURE 2 is a sectional view of the middle part of the rotor, taken along the line A - A of Figure 1 and seen in the direction of the arrows t e ~of:
FIGURE 3 is a sectional view of the rotor, taken along the line B - B of Figure 2 and seen in the direction of the arrows thereof;
FIGURE 4 is a sectional view of the rotor, taken along the line C - C of Figure 2 and seen in the direction of the arrows thereof;
FIGURE 5 is a diagram showing the state of flow of the cooling gas in the rotor of Figure l;
FIGURE 6 is a characteristic curve diagram showing the values of the temperature increase of the windings of a rotor in accordance with the present invention and the values of the temperature increase of the windings of a rotor having the former cooling structure; and FIGURE 7 is a diagram showing the state of flow of the cooling gas in the interior of a rotor in accordance with another embodiment of this invention, appearing with Figure 5.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings and more particularly to Figures 1 and 2 thereof, sub-slots 1 are provided in the bottoms of slots 4 accommodating coils 3 provided on the outer periphery of an iron core 12 of a rotor. The sub-slots 1 extend along the entire length of the slots 4 and communicate with passages 2 which are formed in the coils 3 located 2~ in the middle part of the iron core 12 of the rotor and which extend .. ... , _. . _ , 105867~
in a radial direction with respect to the rotor. The structure of the rotor is such that it is symmetrical about its longitudinal center.
As shown in Figures 3 and 4, a coil 3 accommodated in a slot 4 is made up of a plurality of coil element wires superimposed on one an-other, and insulating plates 5 are interposed between the coil element wires so as to provide insulation therefor. A mat 6a of insulating material is placed at the bottom of the slot 4, and the outside of the coil
3 is covered by two slot insulators 6b having an L-shaped cross section and facing one another so as to provide a U-shaped configuration, effecting insulation between the coil 3 and the iron core 12 of the rotor.
An insulator 9 is placed on top of the coils 3 in the slot 4, and pressure ~s exerted on the top of the insulator by a wedge 10, the insulator being thus held in the slot 4.
A coil slot 7 extending in the axial direction is formed in each of the coil element wires making-up the coil 3. This coil slot 7 becomes a path for cooling gas.
Referring again to Figures 1 and 2, the coil slot 7 extends from the part of the coil 3 projecting from the end part of the iron core 12 of the rotor to the vicinity of the middle part in the iron core 12 of the rotor. The ends of the coil slots 7 of each coil 3 communicate with passages 7a, which extend through the coil element wires superimposed on one another, in the parts projecting from the ends of the iron core 12 of the rotor, and which are open on the coil surfaces facing the shaft and thus communicate with the outside of the iron core 12 of the rotor.
.~ 10_76 On the other hand, the ends of the coil slots 7 located in the middle part of the iron core 12 of the rotor communicate with passages 8 which extend through the coil element wires superimposed on one another and open on the outside surface of the iron core 12 of the rotor.
Also, in the middle part of the coil 3, located in the slot 4, the passages 2 extend through the coil element wires superimposed on one another, one end opening at the outside surface of the iron core 12 of the rotor and the other end communicating with the sub-slot 1, such passages extending in a radial direction with respect to the iron core 12 of the rotor.
The action of cooling the rotor coils 3 will now be described.
As shown in Figure 5 in the present invention, while the rotor is rotating, cooling gas is driven in the direction of the core 12 of the rotor by the rotation of fans 11 provided at each end of the rotor. The cooling gas delivered by the fans 11 is divided into a part which flows through the interior of the coils 3 and is discharged from the surface of the iron core 12 of the rotor in the vicinity of the middle part of the iron core 12 of the rotor, and thus cools the parts of the coils extending to the vicinity of the middle of the iron core 12 of the rotor, and a part which flows into the subslots 1 and cools only the parts of the coils in the middle part of the iron core of the rotor.
As regards the cooling of the wound coils 3 from the ends to the vicinity of the middle of the iron core 12 of the rotor, as shown in Figures 1 and 2, the cooling gas enters the coil 510ts 7 of the element wires of the coils 3 from the passages 7a provided in the parts of the coils 3 projecting from the ends of the iron core 12 of the rotor, flows through the interior of the coil element wires and cools them, and is discharged to the rotor surface from the passages 8 in the vicinity of the middle of the iron core 12 of the rotor.
On the other hand, the cooling gas that has entered the sub-slots 1 flows through the interior of the sub-slots 1 to the middle part of the iron core 12 of the rotor, and then through the passages 2 provided in the middle of the coils 3, and thus cools the middle parts of the coils 3, be~ng discharged from the rotor surface. In part;cular, the cooling gas ; that has been supplied to the sub-slots 1 is hardly heated at all before ~t cools the middle parts of the coils 3, and it reaches the middle parts of the co~ls 3 in a cool state and can thus readily cool the middle parts of the coils.
As shown in Figure 6, as regards the value of the temperature increase of the coils 3 in the direction of the axis of the iron core 12 of the rotor, in accordance with this invention, particularly in the value of the temperature increase in the middle parts, it was possible to obtain a 25X reduction of the temperature increase value of line B as compared with the increase value reflected by line A of the former cooling structure.
It was also possible to obtain a 17% reduction in the value of the tempera-ture increase averaged over the whole length of the coils.
~ The sub-slots 1 provided in the bottoms of the slots 4 in the iron core 12 of the rotor need only have a cross-sectional area sufficient to permit the flow of enough cooling gas to cool only the parts of the coils 3 in the middle part of the iron core 12 of the rctor, and their cross-sectional area can be comparatively small. Accordingly, the mechanical strength of the iron core 12 of the rotor is not excessively reduced by the formation of the sub-slots 1.
In Figures 1 and 2, the coil slots 7 in the coil element wires stop in the vicinity of the middle part of the iron core 12 of the rotor and do not extend to the middle part. In Figure 7, the coil slots 7 in the element wires of the coils 3 do not stop in the vicinity of the middle `part of the iron core 12 of the rotor, but extend over the whole length of the coil element wires. Accordingly, the coil slots 7 intersect the passages 2 in the middle part of the iron core 12 of the rotor, and the cooling gas which has flowed from the sub-slots 1 into the passages 2 mixes with part of the cooling gas which has flowed through the coil slots 7 and been heated, but essentially there is no great impairment of the cooling of the middle of the iron core 12 of the rotor and sattsfactory cooling is possible.
In particular, when the coil slots 7 extend along the whole length of the coil element wires, as in Figure 7, the effectiveness of the .
cooling of the parts of the coils in the middle of the iron core 12 of the rotor is somewhat inferior to that of Figure S, but as regards the machining of the slots 7, they are machined along the whole length and therefore the machining efficiency is better and the productivity is improved, as compared with the structure of Figure 2, in which the machining of the coil slots 7 is stopped at an intermediate point.
By means of the present invention the increase in the temperature of the parts of the coils in the middle of the iron core of the rotor, which in the past were somewhat overheated, can be kept low, and it is possible to provide a dynamo electric machine of which the dimensions are small and the capacity is great.
Obviously many modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be under-stood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.
An insulator 9 is placed on top of the coils 3 in the slot 4, and pressure ~s exerted on the top of the insulator by a wedge 10, the insulator being thus held in the slot 4.
A coil slot 7 extending in the axial direction is formed in each of the coil element wires making-up the coil 3. This coil slot 7 becomes a path for cooling gas.
Referring again to Figures 1 and 2, the coil slot 7 extends from the part of the coil 3 projecting from the end part of the iron core 12 of the rotor to the vicinity of the middle part in the iron core 12 of the rotor. The ends of the coil slots 7 of each coil 3 communicate with passages 7a, which extend through the coil element wires superimposed on one another, in the parts projecting from the ends of the iron core 12 of the rotor, and which are open on the coil surfaces facing the shaft and thus communicate with the outside of the iron core 12 of the rotor.
.~ 10_76 On the other hand, the ends of the coil slots 7 located in the middle part of the iron core 12 of the rotor communicate with passages 8 which extend through the coil element wires superimposed on one another and open on the outside surface of the iron core 12 of the rotor.
Also, in the middle part of the coil 3, located in the slot 4, the passages 2 extend through the coil element wires superimposed on one another, one end opening at the outside surface of the iron core 12 of the rotor and the other end communicating with the sub-slot 1, such passages extending in a radial direction with respect to the iron core 12 of the rotor.
The action of cooling the rotor coils 3 will now be described.
As shown in Figure 5 in the present invention, while the rotor is rotating, cooling gas is driven in the direction of the core 12 of the rotor by the rotation of fans 11 provided at each end of the rotor. The cooling gas delivered by the fans 11 is divided into a part which flows through the interior of the coils 3 and is discharged from the surface of the iron core 12 of the rotor in the vicinity of the middle part of the iron core 12 of the rotor, and thus cools the parts of the coils extending to the vicinity of the middle of the iron core 12 of the rotor, and a part which flows into the subslots 1 and cools only the parts of the coils in the middle part of the iron core of the rotor.
As regards the cooling of the wound coils 3 from the ends to the vicinity of the middle of the iron core 12 of the rotor, as shown in Figures 1 and 2, the cooling gas enters the coil 510ts 7 of the element wires of the coils 3 from the passages 7a provided in the parts of the coils 3 projecting from the ends of the iron core 12 of the rotor, flows through the interior of the coil element wires and cools them, and is discharged to the rotor surface from the passages 8 in the vicinity of the middle of the iron core 12 of the rotor.
On the other hand, the cooling gas that has entered the sub-slots 1 flows through the interior of the sub-slots 1 to the middle part of the iron core 12 of the rotor, and then through the passages 2 provided in the middle of the coils 3, and thus cools the middle parts of the coils 3, be~ng discharged from the rotor surface. In part;cular, the cooling gas ; that has been supplied to the sub-slots 1 is hardly heated at all before ~t cools the middle parts of the coils 3, and it reaches the middle parts of the co~ls 3 in a cool state and can thus readily cool the middle parts of the coils.
As shown in Figure 6, as regards the value of the temperature increase of the coils 3 in the direction of the axis of the iron core 12 of the rotor, in accordance with this invention, particularly in the value of the temperature increase in the middle parts, it was possible to obtain a 25X reduction of the temperature increase value of line B as compared with the increase value reflected by line A of the former cooling structure.
It was also possible to obtain a 17% reduction in the value of the tempera-ture increase averaged over the whole length of the coils.
~ The sub-slots 1 provided in the bottoms of the slots 4 in the iron core 12 of the rotor need only have a cross-sectional area sufficient to permit the flow of enough cooling gas to cool only the parts of the coils 3 in the middle part of the iron core 12 of the rctor, and their cross-sectional area can be comparatively small. Accordingly, the mechanical strength of the iron core 12 of the rotor is not excessively reduced by the formation of the sub-slots 1.
In Figures 1 and 2, the coil slots 7 in the coil element wires stop in the vicinity of the middle part of the iron core 12 of the rotor and do not extend to the middle part. In Figure 7, the coil slots 7 in the element wires of the coils 3 do not stop in the vicinity of the middle `part of the iron core 12 of the rotor, but extend over the whole length of the coil element wires. Accordingly, the coil slots 7 intersect the passages 2 in the middle part of the iron core 12 of the rotor, and the cooling gas which has flowed from the sub-slots 1 into the passages 2 mixes with part of the cooling gas which has flowed through the coil slots 7 and been heated, but essentially there is no great impairment of the cooling of the middle of the iron core 12 of the rotor and sattsfactory cooling is possible.
In particular, when the coil slots 7 extend along the whole length of the coil element wires, as in Figure 7, the effectiveness of the .
cooling of the parts of the coils in the middle of the iron core 12 of the rotor is somewhat inferior to that of Figure S, but as regards the machining of the slots 7, they are machined along the whole length and therefore the machining efficiency is better and the productivity is improved, as compared with the structure of Figure 2, in which the machining of the coil slots 7 is stopped at an intermediate point.
By means of the present invention the increase in the temperature of the parts of the coils in the middle of the iron core of the rotor, which in the past were somewhat overheated, can be kept low, and it is possible to provide a dynamo electric machine of which the dimensions are small and the capacity is great.
Obviously many modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be under-stood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.
Claims (6)
1. A rotor of a dynamo electric machine, comprising:
a plurality of slots provided in the outside of the iron core of the rotor and extending in the axial direction thereof;
a plurality of coils accommodated in said slots;
a plurality of sub-slots provided in the bottoms of said slots;
a plurality of coil-slots provided in said coils;
first passages providing communication between said coil slots and a middle surface of the iron core of the rotor; and second passages providing communication between said sub-slots and the middle surface of the iron core.
a plurality of slots provided in the outside of the iron core of the rotor and extending in the axial direction thereof;
a plurality of coils accommodated in said slots;
a plurality of sub-slots provided in the bottoms of said slots;
a plurality of coil-slots provided in said coils;
first passages providing communication between said coil slots and a middle surface of the iron core of the rotor; and second passages providing communication between said sub-slots and the middle surface of the iron core.
2. A rotor of a dynamo electric machine according to Claim 1, wherein said first passages communicate with said second passages in the vicinity of the middle iron core of the rotor.
3. A rotor of a dynamo electric machine according to Claim 1, further comprising ventilating means provided in the vicinity of the end of the rotor for ventilating a fluid into said coil slots of the coils projecting from the ends of said iron core of the rotor and said sub-slots.
4. A rotor of a dynamo electric machine according to Claim 3, wherein said ventilating means is a fan.
5. A rotor of a dynamo electric machine according to Claim 1, wherein said coil slots provided in said coils are provided the whole length of the coils.
6. A rotor of a dynamo electric machine, comprising:
a plurality of slots provided in the outside of the iron core of the rotor and extending in the axial direction;
a plurality of coils accommodated in said slots;
a plurality of sub-slots provided in the bottoms of said slots;
a plurality of coil slots provided inside said coils;
first passages which are formed in part of the coils projecting from the ends of the iron core of the rotor and which provide communication between said coil slots and the outside of the rotor;
second passages which are formed in the outer surface of the iron core of the rotor in the vicinity of the axial center of the core and which communicate with said coil slots; and passages which are formed in parts of the coils in the middle of the iron core of the rotor and which provide communication between said sub-slots and the outside surface of the iron core of the rotor.
a plurality of slots provided in the outside of the iron core of the rotor and extending in the axial direction;
a plurality of coils accommodated in said slots;
a plurality of sub-slots provided in the bottoms of said slots;
a plurality of coil slots provided inside said coils;
first passages which are formed in part of the coils projecting from the ends of the iron core of the rotor and which provide communication between said coil slots and the outside of the rotor;
second passages which are formed in the outer surface of the iron core of the rotor in the vicinity of the axial center of the core and which communicate with said coil slots; and passages which are formed in parts of the coils in the middle of the iron core of the rotor and which provide communication between said sub-slots and the outside surface of the iron core of the rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA260,113A CA1058676A (en) | 1976-08-30 | 1976-08-30 | Rotor of a dynamo electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA260,113A CA1058676A (en) | 1976-08-30 | 1976-08-30 | Rotor of a dynamo electric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1058676A true CA1058676A (en) | 1979-07-17 |
Family
ID=4106746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA260,113A Expired CA1058676A (en) | 1976-08-30 | 1976-08-30 | Rotor of a dynamo electric machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1058676A (en) |
-
1976
- 1976-08-30 CA CA260,113A patent/CA1058676A/en not_active Expired
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