CA1181118A - Coolant-distributing conduits for salient pole dynamoelectric machines - Google Patents
Coolant-distributing conduits for salient pole dynamoelectric machinesInfo
- Publication number
- CA1181118A CA1181118A CA000390136A CA390136A CA1181118A CA 1181118 A CA1181118 A CA 1181118A CA 000390136 A CA000390136 A CA 000390136A CA 390136 A CA390136 A CA 390136A CA 1181118 A CA1181118 A CA 1181118A
- Authority
- CA
- Canada
- Prior art keywords
- conduit
- coolant
- electrical machine
- set forth
- rotor shaft
- 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
- 239000002826 coolant Substances 0.000 claims abstract description 33
- 238000004891 communication Methods 0.000 claims abstract description 3
- 238000000638 solvent extraction Methods 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
-
- 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
- H02K1/325—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium between salient poles
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An electrical machine axially-ventilated from opposite ends thereof. A rotor is provided with a plurality of salient poles, field coils and a rotor shaft. At least one coolant-distributing conduit extends axially along the rotor and radially between each of the poles. The conduit has lateral surfaces spaced from the field coils so as to form a gap therebetween wherein a portion of the conduit facing the rotor shaft has a longitudinal aperture formed therein for communication with the gap. A gaseous coolant is supplied to the conduit and communicated to each of the plurality of field coils by the conduit.
An electrical machine axially-ventilated from opposite ends thereof. A rotor is provided with a plurality of salient poles, field coils and a rotor shaft. At least one coolant-distributing conduit extends axially along the rotor and radially between each of the poles. The conduit has lateral surfaces spaced from the field coils so as to form a gap therebetween wherein a portion of the conduit facing the rotor shaft has a longitudinal aperture formed therein for communication with the gap. A gaseous coolant is supplied to the conduit and communicated to each of the plurality of field coils by the conduit.
Description
The invention relates to an axially-ventilated electrical machine having a rotor with salient poles, coolant-distributing conduits extending in the axial direction being located in the pole-gaps.
A machine of this type is known from German Auslegeschrift 1,085,606~ Electrical machines are conventionally cooled in order to remove the heat losses in such a way that during normal operation, heating of the individual parts of the electrical machine does not exceed the specified limiting temperatures.
It is commonly known that salient-pole machines, which receive their coolant supply symme-trically from opposite sides, exhibit higher tempera-tures at the pole-windings in the center than in the vicinity of the end-faces, shortly after the entry of the coolant into the pole-gaps. This is caused by the fact that, as viewed over the axial length of the machine, the coolant passes over into the stator via the air-gap between the rotor and the stator. As a
A machine of this type is known from German Auslegeschrift 1,085,606~ Electrical machines are conventionally cooled in order to remove the heat losses in such a way that during normal operation, heating of the individual parts of the electrical machine does not exceed the specified limiting temperatures.
It is commonly known that salient-pole machines, which receive their coolant supply symme-trically from opposite sides, exhibit higher tempera-tures at the pole-windings in the center than in the vicinity of the end-faces, shortly after the entry of the coolant into the pole-gaps. This is caused by the fact that, as viewed over the axial length of the machine, the coolant passes over into the stator via the air-gap between the rotor and the stator. As a
2~ result, the velocity in the pole-gaps continuously decreases, as far as the center of the machine~ so that a heat transmission coefficient adequately sufficing for the removal of the losses is no longer achieved ~y the low coolant velocities.
~' ' In the case of the displacemen-t-bodies disclosed in German Auslegeschrift 1~085,606, which have been installed in the pole-gaps, the coolant is admittely led to the surfaces to be cooled, in a directed manner, particularly to the ~ield coils, and the velocity of the coolant flowing radially into the pole-gaps is at the same time increased, thereby increasing the heat transmission coefficient of the coolant. However, this expedient is obtained at the expense of a higher static pressure-drop in the coolant circuit of the machine, this higher pressure-drop resulting in increased power being necessary for circulating the coolant flow and, consequently, a simultaneous increase in the power for driving the fan is required. In unfavorable cases, this effect can even lead to the requirement of adopting other types of pressure-generators.
Accordingly, a feature of the present invention is to provide a remedy in this area. The invention solves the problem of producing an axially-ventilated electrical machine possessing a rotor with salient poles, coolant-distributing conduits extending in the axial direction being located in the pole-gaps, these bodies enabling the coolant to be channeled and its velocity to be raised in an optimum manner, while matching the cooling conditions applied in each case.
The location and distribution of the coolant-distributing conduits in the pole-gaps exhibit the following advantages:
1. By reduci.ng the cross-section of the longitudinal surfaces of the field coils) the radial velocity of the coolant is increased to the extent that a heat transmission coefficient which is adequate for removing the heat is achieved, 2. By means of its shape, the installation even adopts the function of the known pole-gap based-- channel, that is to say~ it ensures that a relatively large pxoportion of the coolant can flow into the center o the machine, without first being heated;
~' ' In the case of the displacemen-t-bodies disclosed in German Auslegeschrift 1~085,606, which have been installed in the pole-gaps, the coolant is admittely led to the surfaces to be cooled, in a directed manner, particularly to the ~ield coils, and the velocity of the coolant flowing radially into the pole-gaps is at the same time increased, thereby increasing the heat transmission coefficient of the coolant. However, this expedient is obtained at the expense of a higher static pressure-drop in the coolant circuit of the machine, this higher pressure-drop resulting in increased power being necessary for circulating the coolant flow and, consequently, a simultaneous increase in the power for driving the fan is required. In unfavorable cases, this effect can even lead to the requirement of adopting other types of pressure-generators.
Accordingly, a feature of the present invention is to provide a remedy in this area. The invention solves the problem of producing an axially-ventilated electrical machine possessing a rotor with salient poles, coolant-distributing conduits extending in the axial direction being located in the pole-gaps, these bodies enabling the coolant to be channeled and its velocity to be raised in an optimum manner, while matching the cooling conditions applied in each case.
The location and distribution of the coolant-distributing conduits in the pole-gaps exhibit the following advantages:
1. By reduci.ng the cross-section of the longitudinal surfaces of the field coils) the radial velocity of the coolant is increased to the extent that a heat transmission coefficient which is adequate for removing the heat is achieved, 2. By means of its shape, the installation even adopts the function of the known pole-gap based-- channel, that is to say~ it ensures that a relatively large pxoportion of the coolant can flow into the center o the machine, without first being heated;
3. The previously-known pole-gap base-channel no longer needs to be made with the dimensions previously speciied;
The same rate9 per second, o~ coolant flow can be supplied without an increased static pressure-drop in the machine, since the constriction o~ the cross-section at the entry to the pole-gap is very ~light9 due to the fact that the actual cross-section is reduced only by the wall-thickness of the coolant-distributing body; and 5. The installation can even lead to an increased coolant flow, due to the fact that the pressure-generation by the salient-pole rotor is improved.
. . ,~
In accordance with the present invention 9 the longitudinal surfaces of the tubular coolant-distributing conduits extend parallel to the flanks of the pole-bodies and of the field coils9 which are to be cooled, this arrangement resulting in simple and readily visible coolant-paths. Furthermore, the gap between the longitudinal surfaces of the tubular coolant-distributing bodies and the flanks of the pole-bodies and of the field coils which are to be cooled is configured so that it tapers, or widens, in a radially outward direction, and the possibility of controlling the cooling effect in the longitudinal direction of the machine results therefrom. Also according to the present invention, the tubular coolant-distributing conduit i5 attached to the rotor shaft of the rotor by means of retaining bolts, and is spaced from the rotor shaft by means of, for example, spacer~
sleeves. Additionally~ the effective cross-section of the coolant flow-apertures in the coolant-distribu~-ing conduit is varied in the axial flow direction9 ameasure which can be adopted, either on its own, or in combination with the gap configuration discussed above, and similarly brings about a uniform cooling effect in the longitudinal direction of the machine.
In the case of machines which are ventilated from opposite sides, at least two coolant-distributing conduits are provided per pole-gap. These bodies ..~
~"~ .
- -extend approximately symmetrically, Lrom the end~faces, as far as the center o~ the rotor, where they are open, partially closed, or completely closedg and possess baffle devices.
As an alternative embodimentg a coolant-distribu~ing body is partially or completely divided, in the section at the mid-point of the rotor, by means of a partition9 which is designed as a baffle device.
According to a further broad aspect of the 19 present lnvention there is provided an electrical machine axially-ventilated from opposite ends thereo~. ~ rotor is provided with a plurality of salient poles, field coils and a rotor shaft. At least one coolant-distributing conduit extends axially along the rotor and radially between each of the poles. The conduit has lateral surfaces spaced from the field coils so as to form a gap therebetween wherein a portion of the conduit facing the rotor shaft has a longitudinal aperture formed therein for communication with the gap~ Means is provided for supplying a gaseous coolant and for communicating the coolant from the conduit to each of the plurality of field coils.
Various 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 in connection with the accompanying drawings in which like reference characters designate like or corresponding parts throughout the several views and wherein FIGURE 1 shows a perspective, partially sectional view of the rotor according to the present invention;
FIGURE 2 shows a longitudinal sectional view through a coolant-distributing conduit, FIGURE 3 shows a partial cross-sectional view through a rotor in accordance with the present invention, according -to FIGURES 1 and 2, and taken along line III-III of FIGURE 2;
FIGURE 4 shows a partial cross-sectional view taken along line IV-IV of FIGURE 2 through a rotor in accordance with the present invention corresponding to FIGURES 1 and 2 but wherein the position of the section differs from that of FIGURE 3, and the poles are of a different configuration.
As shown in FIGURE 1, a central body 1 i~
positioned on a rotor-shaft 2 and is provided with pole-cores 3 which carry pole-shoes 4 and field coils 5. An axial fan 6 is fitted on rotor-shaft 2, fan 6 being assembled from a blade-carrier 7 and a plurality of fan-blades 8. Axial an 6 is located in an aperture of an external fan casing. Shaft 2 is located in a bearing, in a manner permitting rotation, and such bearing is located inside bearing plate 10.
For reasons of clarity, only one half of the rotor is represented in FIGURE 1, the other end of the rotor also being provided with an axial fanO In this exa~ple, only two pole-cores 3 are drawn with associated field coils 5. Pole-gap 11 is represented in the interspace between the surfaces of pole-cores3 and of field coils 5, a coolant-distributing condui-t 12 being located in pole-gap 11. The lateral surfaces 13 of coolant-distributing conduit 12 extend parallel to the lateral surfaces, which are to be cooled, of pole-cores 3 and of field coils 5. In this manner, gaps 1 are formed between lateral surfaces 13 of coolant-distributing conduit 12 and lateral surfaces of pole-cores 3 and of field coils 5.
Coolant-distributing conduit 12 is open towards axial fan 6 and towards central body 1. In contrast, coolant-distributing conduit 12 is closed at the other end thereof in the section at the mid-point of the rotor, by means of a cover plate 15, which is not represented in FIGURE 1, but which is represented in ~IGURE 2.
For reasons of clarity, no attachment elements of the coolant-distributing conduit 12 are shown in FIGURE 1, but these are represented in more detail in the drawings which follow. Reference number 16 marks the apertures which are made in that portion of coolant-distributing conduit 12' which faces central body 1 of the rotorO
,~
FIGURE 2 shows a longitudinal sectional representation of an illustrative embodiment of the coolant-distributing conduit 12, but instead of utilizing uninterrupted aperture 16 in the form o~ a longitudinal gap, shown in FIGURE 1, a plurality of interruptions in the apertures 17 are formed, in FIGURE 2, in that portion 12l of coolant-distributlng conduit 12 which faces the central body 1? these interruptions being caused by the attachment-mechanism of coolant-distributing conduit 12. The direction in which the coolant flows is indicated by arrow 180 As can be seen from FIGURE 2, the effective cross-section of apertures 17 is varied, in the direction of coolant flow, as far as the center of the machine.
As a further measure for stabilizing the pressure and velocity o:E the coolant in the portion at the mid-point of the rotor, baffle devices 19 are arranged in coolant-distributing conduit 12, these devices running obliquely and simultaneously serving to mechanically stiffen body 12.
In order to secure the coolant-distributing conduits 12,a plurality of holes 20 are drilled in conduits 12, sleeves 21 being inserted into these holes and made secure. Sleeves 21 enable retaining bolts 22 to pass therethrough, these bolts being screwed into holes 23~ drilled in the central body 1 of the rotor~
~ ~ $
Only one retaining bolt 22 is drawn in the example representedO Coolant-distributing conduits~l2 are secured to the retaining bolts 22, in each case;
by means of a nut 24.
Spacer-sleeves 25 are located between coolant conduit 12 and central body 1 of the rotor, so that the space between that portion 12~ of the coolant-distributing conduit 12 which faces the central body 1, and central body 1 itself can be spaced according to choice. Spacer-sleeves 25 are made from a metallic material, for example from austenitic steel.
Only one coolant-distributing conduit 12 is shown in FIGURE 2, this body extending, from one end-face of the rotor, to the center of the rotor. A
second coolant-distributing conduit 12~ represented in FIGURE 2 only by way of indication, is located in the right-hand half of the rotor, symmetrical to first conduit 12.
In FIGURE 3 the spacial arrangement of coolant-distributing conduit 12 in pole-gap 11 is shown. Coolant-distributing conduit 12 is, in lower portion 12~, spaced away from the central body 1 of the rotor by means of spacer-sleeves 25~ and lateral surfaces 13 are spaced away from lateral surfaces of field coils 5 by means of winding-supports 26.
Winding-supports 26 are preferably made of plasticO
,..~
FIGURE 3 shows how the configuration of coolant-distributing conduit 12 can be matched to the confi-gurations of pole-cores 3, of pole-shoes 4, and of field coil 5.
In this example, coolant-distributing conduits 12 are made of austenitic steel, of aluminium-alloy, or of glass fiber reinforced plastic. Baffle device 19 is made of the same material.
In order to show the possibility of matching coolant-distributing conduit 12 to different design-embodiments of pole-cores 3, pole-shoes 4 and field coils 5, a partial cross-section view through a rotor has been represented in FIGURE 4, pole-shoes 4 of this rotor being considerably shorter than in FIGURE 3, while field coils 5 project above pole-shoes 4.
In this case, coolant-distributing conduit 12 is designed with a shape which differs from the shape represented in FIGURE 3, in order to ensure optimal guidance of the coolant for this type of machineO A
sectional view through an aperture 17 is visible in FIGURE 4, the coolant issuing from coolant-distributing conduit 12 via aperture 17, and the direction in which the coolant flows along the lateral surfaces of field coils 5 is represented, in the direction of the arrows, by reference number 18.
. ~
The mode of operation of -the example of coolant-distributing conduit 12, represented here 7 iS
as follows. The flow of coolant, generated by axial fans 6, located to the right and to the left, outside the rotor body, is conveyed in the axial direction corresponding to arrows 18 represented in FIGURE 1, from the end-faces of the rotor, into coolant-distributing conduits 12. The coolant flows through coolant-distributing conduits 12, on both sides thereof, in a longitudinal direction parallel to the axis of the machine and is deflected towards the central body 1 of the rotor, passes -through apertures 16 located in that portion 12' of the coolant-distributing conduit 12 which faces the central body and is led into gaps 1~, which spaces lateral surfaces 13 of coolant-distributing ~onduit 12 and lateral surfaces of pole-cores 3 and of field coils 5~ In this process, the axial flow direction of the coolant inside coolant-distributing conduits 1~ is turned into a radial flow corresponding to arrows 18 represented in the Figures.
This radial coolant flow is continuously led along lateral surfaces of field coils 5 and of pole-cores 3, in all zones of the rotor, and enables stray heat to be led away from tield coils 5 and from pole-cores 3 in an optimal manner and in all parts of the rotor, when the coolant flow-rate and velocity is appropriately matched to the particular type of machine in question.
Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims 9 the invention may be practiced otherwise than as specifically described herein.
The same rate9 per second, o~ coolant flow can be supplied without an increased static pressure-drop in the machine, since the constriction o~ the cross-section at the entry to the pole-gap is very ~light9 due to the fact that the actual cross-section is reduced only by the wall-thickness of the coolant-distributing body; and 5. The installation can even lead to an increased coolant flow, due to the fact that the pressure-generation by the salient-pole rotor is improved.
. . ,~
In accordance with the present invention 9 the longitudinal surfaces of the tubular coolant-distributing conduits extend parallel to the flanks of the pole-bodies and of the field coils9 which are to be cooled, this arrangement resulting in simple and readily visible coolant-paths. Furthermore, the gap between the longitudinal surfaces of the tubular coolant-distributing bodies and the flanks of the pole-bodies and of the field coils which are to be cooled is configured so that it tapers, or widens, in a radially outward direction, and the possibility of controlling the cooling effect in the longitudinal direction of the machine results therefrom. Also according to the present invention, the tubular coolant-distributing conduit i5 attached to the rotor shaft of the rotor by means of retaining bolts, and is spaced from the rotor shaft by means of, for example, spacer~
sleeves. Additionally~ the effective cross-section of the coolant flow-apertures in the coolant-distribu~-ing conduit is varied in the axial flow direction9 ameasure which can be adopted, either on its own, or in combination with the gap configuration discussed above, and similarly brings about a uniform cooling effect in the longitudinal direction of the machine.
In the case of machines which are ventilated from opposite sides, at least two coolant-distributing conduits are provided per pole-gap. These bodies ..~
~"~ .
- -extend approximately symmetrically, Lrom the end~faces, as far as the center o~ the rotor, where they are open, partially closed, or completely closedg and possess baffle devices.
As an alternative embodimentg a coolant-distribu~ing body is partially or completely divided, in the section at the mid-point of the rotor, by means of a partition9 which is designed as a baffle device.
According to a further broad aspect of the 19 present lnvention there is provided an electrical machine axially-ventilated from opposite ends thereo~. ~ rotor is provided with a plurality of salient poles, field coils and a rotor shaft. At least one coolant-distributing conduit extends axially along the rotor and radially between each of the poles. The conduit has lateral surfaces spaced from the field coils so as to form a gap therebetween wherein a portion of the conduit facing the rotor shaft has a longitudinal aperture formed therein for communication with the gap~ Means is provided for supplying a gaseous coolant and for communicating the coolant from the conduit to each of the plurality of field coils.
Various 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 in connection with the accompanying drawings in which like reference characters designate like or corresponding parts throughout the several views and wherein FIGURE 1 shows a perspective, partially sectional view of the rotor according to the present invention;
FIGURE 2 shows a longitudinal sectional view through a coolant-distributing conduit, FIGURE 3 shows a partial cross-sectional view through a rotor in accordance with the present invention, according -to FIGURES 1 and 2, and taken along line III-III of FIGURE 2;
FIGURE 4 shows a partial cross-sectional view taken along line IV-IV of FIGURE 2 through a rotor in accordance with the present invention corresponding to FIGURES 1 and 2 but wherein the position of the section differs from that of FIGURE 3, and the poles are of a different configuration.
As shown in FIGURE 1, a central body 1 i~
positioned on a rotor-shaft 2 and is provided with pole-cores 3 which carry pole-shoes 4 and field coils 5. An axial fan 6 is fitted on rotor-shaft 2, fan 6 being assembled from a blade-carrier 7 and a plurality of fan-blades 8. Axial an 6 is located in an aperture of an external fan casing. Shaft 2 is located in a bearing, in a manner permitting rotation, and such bearing is located inside bearing plate 10.
For reasons of clarity, only one half of the rotor is represented in FIGURE 1, the other end of the rotor also being provided with an axial fanO In this exa~ple, only two pole-cores 3 are drawn with associated field coils 5. Pole-gap 11 is represented in the interspace between the surfaces of pole-cores3 and of field coils 5, a coolant-distributing condui-t 12 being located in pole-gap 11. The lateral surfaces 13 of coolant-distributing conduit 12 extend parallel to the lateral surfaces, which are to be cooled, of pole-cores 3 and of field coils 5. In this manner, gaps 1 are formed between lateral surfaces 13 of coolant-distributing conduit 12 and lateral surfaces of pole-cores 3 and of field coils 5.
Coolant-distributing conduit 12 is open towards axial fan 6 and towards central body 1. In contrast, coolant-distributing conduit 12 is closed at the other end thereof in the section at the mid-point of the rotor, by means of a cover plate 15, which is not represented in FIGURE 1, but which is represented in ~IGURE 2.
For reasons of clarity, no attachment elements of the coolant-distributing conduit 12 are shown in FIGURE 1, but these are represented in more detail in the drawings which follow. Reference number 16 marks the apertures which are made in that portion of coolant-distributing conduit 12' which faces central body 1 of the rotorO
,~
FIGURE 2 shows a longitudinal sectional representation of an illustrative embodiment of the coolant-distributing conduit 12, but instead of utilizing uninterrupted aperture 16 in the form o~ a longitudinal gap, shown in FIGURE 1, a plurality of interruptions in the apertures 17 are formed, in FIGURE 2, in that portion 12l of coolant-distributlng conduit 12 which faces the central body 1? these interruptions being caused by the attachment-mechanism of coolant-distributing conduit 12. The direction in which the coolant flows is indicated by arrow 180 As can be seen from FIGURE 2, the effective cross-section of apertures 17 is varied, in the direction of coolant flow, as far as the center of the machine.
As a further measure for stabilizing the pressure and velocity o:E the coolant in the portion at the mid-point of the rotor, baffle devices 19 are arranged in coolant-distributing conduit 12, these devices running obliquely and simultaneously serving to mechanically stiffen body 12.
In order to secure the coolant-distributing conduits 12,a plurality of holes 20 are drilled in conduits 12, sleeves 21 being inserted into these holes and made secure. Sleeves 21 enable retaining bolts 22 to pass therethrough, these bolts being screwed into holes 23~ drilled in the central body 1 of the rotor~
~ ~ $
Only one retaining bolt 22 is drawn in the example representedO Coolant-distributing conduits~l2 are secured to the retaining bolts 22, in each case;
by means of a nut 24.
Spacer-sleeves 25 are located between coolant conduit 12 and central body 1 of the rotor, so that the space between that portion 12~ of the coolant-distributing conduit 12 which faces the central body 1, and central body 1 itself can be spaced according to choice. Spacer-sleeves 25 are made from a metallic material, for example from austenitic steel.
Only one coolant-distributing conduit 12 is shown in FIGURE 2, this body extending, from one end-face of the rotor, to the center of the rotor. A
second coolant-distributing conduit 12~ represented in FIGURE 2 only by way of indication, is located in the right-hand half of the rotor, symmetrical to first conduit 12.
In FIGURE 3 the spacial arrangement of coolant-distributing conduit 12 in pole-gap 11 is shown. Coolant-distributing conduit 12 is, in lower portion 12~, spaced away from the central body 1 of the rotor by means of spacer-sleeves 25~ and lateral surfaces 13 are spaced away from lateral surfaces of field coils 5 by means of winding-supports 26.
Winding-supports 26 are preferably made of plasticO
,..~
FIGURE 3 shows how the configuration of coolant-distributing conduit 12 can be matched to the confi-gurations of pole-cores 3, of pole-shoes 4, and of field coil 5.
In this example, coolant-distributing conduits 12 are made of austenitic steel, of aluminium-alloy, or of glass fiber reinforced plastic. Baffle device 19 is made of the same material.
In order to show the possibility of matching coolant-distributing conduit 12 to different design-embodiments of pole-cores 3, pole-shoes 4 and field coils 5, a partial cross-section view through a rotor has been represented in FIGURE 4, pole-shoes 4 of this rotor being considerably shorter than in FIGURE 3, while field coils 5 project above pole-shoes 4.
In this case, coolant-distributing conduit 12 is designed with a shape which differs from the shape represented in FIGURE 3, in order to ensure optimal guidance of the coolant for this type of machineO A
sectional view through an aperture 17 is visible in FIGURE 4, the coolant issuing from coolant-distributing conduit 12 via aperture 17, and the direction in which the coolant flows along the lateral surfaces of field coils 5 is represented, in the direction of the arrows, by reference number 18.
. ~
The mode of operation of -the example of coolant-distributing conduit 12, represented here 7 iS
as follows. The flow of coolant, generated by axial fans 6, located to the right and to the left, outside the rotor body, is conveyed in the axial direction corresponding to arrows 18 represented in FIGURE 1, from the end-faces of the rotor, into coolant-distributing conduits 12. The coolant flows through coolant-distributing conduits 12, on both sides thereof, in a longitudinal direction parallel to the axis of the machine and is deflected towards the central body 1 of the rotor, passes -through apertures 16 located in that portion 12' of the coolant-distributing conduit 12 which faces the central body and is led into gaps 1~, which spaces lateral surfaces 13 of coolant-distributing ~onduit 12 and lateral surfaces of pole-cores 3 and of field coils 5~ In this process, the axial flow direction of the coolant inside coolant-distributing conduits 1~ is turned into a radial flow corresponding to arrows 18 represented in the Figures.
This radial coolant flow is continuously led along lateral surfaces of field coils 5 and of pole-cores 3, in all zones of the rotor, and enables stray heat to be led away from tield coils 5 and from pole-cores 3 in an optimal manner and in all parts of the rotor, when the coolant flow-rate and velocity is appropriately matched to the particular type of machine in question.
Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims 9 the invention may be practiced otherwise than as specifically described herein.
Claims (13)
1. An electrical machine axially-ventilated from opposite ends thereof comprising:
a rotor having a plurality of salient poles, field coils and a rotor shaft;
at least one coolant-distributing conduit extending axially along said rotor and radially between each of said poles, said conduit having lateral surfaces spaced from said field coils so as to form a gap therebetween wherein a portion of said conduit facing said rotor shaft has a longitudinal aperture formed therein for communication with said gap; and means for supplying a gaseous coolant and for communicating said coolant from said conduit to each of said plurality of field coils.
a rotor having a plurality of salient poles, field coils and a rotor shaft;
at least one coolant-distributing conduit extending axially along said rotor and radially between each of said poles, said conduit having lateral surfaces spaced from said field coils so as to form a gap therebetween wherein a portion of said conduit facing said rotor shaft has a longitudinal aperture formed therein for communication with said gap; and means for supplying a gaseous coolant and for communicating said coolant from said conduit to each of said plurality of field coils.
2. An electrical machine as set forth in claim 1, wherein said lateral surfaces extend parallel to a flank portion of said plurality of poles and field coils.
3. An electrical machine as set forth in claims 1 or 2, wherein said gap tapers in a radially outward direction.
4. An electrical machine as set forth in claims 1 or 2, wherein said gap widens in a radially outward direction.
5. An electrical machine as set forth in claim 1, further comprising means for connecting said conduit to said rotor shaft and for spacing said conduit from rotor shaft.
6. An electrical machine as set forth in claim 1, wherein the effective cross-sectional area of said longitudinal aperture is varied in the axial direc-tional flow of said coolant in said conduit so as to uniformly cool said field coils.
7. An electrical machine as set forth in claim 1, wherein said conduit further comprises at least a first and second coolant-distributing conduit positioned between adjacent poles which extend approximately symmetrically about said rotor shaft and which are opened adjacent said rotor shaft.
8. An electrical machine as set forth in claim 1, wherein said conduit further comprises at least a first and second coolant-distributing conduit positioned between adjacent poles which extend approximately symmetrically about said rotor shaft and which are closed adjacent said rotor shaft.
9. An electrical machine as set forth in claim 1, wherein said conduit further comprises at least a first and second coolant-distributing conduit positioned between adjacent poles which extend approximately symmetrically about said rotor shaft and which are partially closed adjacent said rotor shaft.
10. An electrical machine as set forth in claim 1, further comprising baffle means positioned within said at least one conduit.
11. An electrical machine as set forth in claim 1, wherein said at least one conduit further comprises a one piece conduit member.
12. An electrical machine as set forth in claim 1, further comprising partitioning means disposed on said conduit for at least partially separating interior portions of said conduit.
13. An electrical machine as set forth in claim 12, wherein said partitioning means further comprises baffle means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH849480 | 1980-11-17 | ||
| CH8494/80-8 | 1980-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1181118A true CA1181118A (en) | 1985-01-15 |
Family
ID=4341167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000390136A Expired CA1181118A (en) | 1980-11-17 | 1981-11-16 | Coolant-distributing conduits for salient pole dynamoelectric machines |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0052383B1 (en) |
| AT (1) | ATE13374T1 (en) |
| BR (1) | BR8107375A (en) |
| CA (1) | CA1181118A (en) |
| DE (1) | DE3170511D1 (en) |
| NO (1) | NO156550C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4794285A (en) * | 1979-12-14 | 1988-12-27 | Nippondenso Co., Ltd. | Vehicle AC generator with voltage regulator |
| US5086246A (en) * | 1990-02-22 | 1992-02-04 | General Electric Canada Inc. | Salient pole rotor for a dynamoelectric machine |
| USRE36038E (en) * | 1983-12-19 | 1999-01-12 | Denso Corporation | Rotor of alternator mounted on vehicle |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4496863A (en) * | 1982-04-22 | 1985-01-29 | Mitsubishi Denki Kabushiki Kaisha | Salient-pole rotor of a rotary electric machine |
| DE3578999D1 (en) * | 1985-04-11 | 1990-09-06 | Nippon Denso Co | A GENERATOR'S ROTOR MOUNTED ON A VEHICLE. |
| FR2719423B1 (en) * | 1994-04-29 | 1996-07-05 | Abb Ind | Synchronous smooth pole electric machine with constant air gap. |
| GB2410380B (en) * | 2000-11-30 | 2005-08-31 | Richard Julius Gozdawa | Rotor for electric generator or motor |
| EP1564865A1 (en) * | 2004-02-12 | 2005-08-17 | Siemens Aktiengesellschaft | Machine having salient poles with at least one winding on the pole |
| DE102012014926A1 (en) * | 2012-07-27 | 2014-01-30 | Andreas Stihl Ag & Co. Kg | "Electric drive motor for a working device" |
| EP4492641A1 (en) * | 2023-07-11 | 2025-01-15 | Abb Schweiz Ag | Rotating electrical machine comprising coil supports |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1191475B (en) * | 1961-07-31 | 1965-04-22 | Licentia Gmbh | Arrangement for guiding the cooling medium in the pole corners of Schenkelpollaeufern electrical machines |
| DE1225288B (en) * | 1962-07-26 | 1966-09-22 | Licentia Gmbh | Arrangement for guiding the cooling medium in the pole corners of Schenkelpollaeufern electrical machines |
| US3514647A (en) * | 1968-09-30 | 1970-05-26 | Gen Electric | Cooling arrangement for dynamoelectric machines |
| US3846651A (en) * | 1973-06-12 | 1974-11-05 | Westinghouse Electric Corp | Dynamoelectric machine ventilating system |
| FR2433255A1 (en) * | 1978-08-11 | 1980-03-07 | Cem Comp Electro Mec | ROTOR OF ELECTRIC MACHINE WITH HIGHER POLE |
-
1981
- 1981-09-10 EP EP81201009A patent/EP0052383B1/en not_active Expired
- 1981-09-10 AT AT81201009T patent/ATE13374T1/en active
- 1981-09-10 DE DE8181201009T patent/DE3170511D1/en not_active Expired
- 1981-11-10 NO NO813807A patent/NO156550C/en unknown
- 1981-11-13 BR BR8107375A patent/BR8107375A/en unknown
- 1981-11-16 CA CA000390136A patent/CA1181118A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4794285A (en) * | 1979-12-14 | 1988-12-27 | Nippondenso Co., Ltd. | Vehicle AC generator with voltage regulator |
| US4926076A (en) * | 1979-12-14 | 1990-05-15 | Nippondenso Co., Ltd. | Alternator with attached diode regulator housing |
| USRE36038E (en) * | 1983-12-19 | 1999-01-12 | Denso Corporation | Rotor of alternator mounted on vehicle |
| US5086246A (en) * | 1990-02-22 | 1992-02-04 | General Electric Canada Inc. | Salient pole rotor for a dynamoelectric machine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3170511D1 (en) | 1985-06-20 |
| NO156550B (en) | 1987-06-29 |
| EP0052383A1 (en) | 1982-05-26 |
| EP0052383B1 (en) | 1985-05-15 |
| ATE13374T1 (en) | 1985-06-15 |
| NO156550C (en) | 1987-10-07 |
| NO813807L (en) | 1982-05-18 |
| BR8107375A (en) | 1982-08-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |