JP5493440B2 - Stator for rotating electric machine and cooling method for stator of rotating electric machine - Google Patents

Description

  The present invention relates to a stator of a rotating electrical machine and a cooling method for the stator of the rotating electrical machine.

  Conventionally, for the purpose of efficiently cooling a stator winding that generates heat by operating a rotating electric machine, fluidity is provided between an insulating bobbin that covers the periphery of the stator core and the surface of the stator core. A heat conductive member (for example, varnish) is filled, and the heat conductive member filled between the insulation bobbin and the stator core is passed through a through hole formed in the insulation bobbin and the insulation bobbin and the stator. There is known a stator of a rotating electrical machine that flows into a gap with a winding (for example, see Patent Document 1).

JP 2004-343877 A

  However, in the technique proposed in Patent Document 1 described above, the through-hole formed in the insulating bobbin is located away from the inlet that injects the heat conductive member between the insulating bobbin and the surface of the stator core. It has been formed. That is, the heat conductive member reaches the through hole after being sufficiently filled between the insulating bobbin and the surface of the stator core.

  For this reason, for example, when a capillary phenomenon does not occur due to a large gap between the insulating bobbin and the stator core surface, there is sufficient heat conductive member in the gap between the insulating bobbin and the stator core surface. Otherwise, the heat conductive member does not reach the through hole and the flow of the heat conductive member into the gap between the insulating bobbin and the stator winding is hindered. There was a possibility that it could not be cooled.

  The present invention has been made in view of the above problems, and by reliably filling a heat conductive member into both the insulating bobbin and the surface of the stator core and the gap between the insulating bobbin and the stator winding. An object of the present invention is to provide a stator for a rotating electrical machine and a method for cooling the stator of the rotating electrical machine that can efficiently improve the performance of cooling the stator winding.

In order to achieve the above object, a stator of a rotating electrical machine according to the present invention includes a stator core, an insulating bobbin covering the periphery of the stator core, and a stator winding wound around the insulating bobbin. ing.
The insulating bobbin is formed at a cylindrical main body around which the stator winding is wound, an outer diameter side flange formed at an outer diameter side end portion of the stator, and an inner diameter side end portion of the stator. And an inner diameter side flange.
A first gap is provided between the inner wall of the main body and the stator core, and the first gap communicates with a space on the outer side of the outer diameter side flange.
An opening that penetrates the outer diameter side flange is formed, and a lowermost part of the opening is in an upper part from an upper surface when the thermally conductive member having fluidity is filled in the stator core.
A wall portion having a surface facing the outer-diameter side flange is erected on the outer side from the insulating bobbin and above the stator core.
A storage portion for storing the thermally conductive member, which is surrounded by the outer diameter side flange, the upper surface of the stator core, and the wall portion, is formed.

  According to the stator of the rotating electrical machine according to the present invention, separate and independent paths are provided between the inner wall of the main body of the insulating bobbin and the stator core (first gap) and to the gap between the insulating bobbin and the stator winding. The heat conductive member is filled therethrough.

Therefore, even if the heat conductive member is not sufficiently filled between the inner wall of the main body of the insulating bobbin and the stator core (first gap), the gap between the insulating bobbin and the stator winding The flow of the heat conductive member is not obstructed, and heat conduction is ensured both between the inner wall of the main body of the insulating bobbin and the stator core (first gap) and in the gap between the insulating bobbin and the stator winding. Since the characteristic member can be supplied, the performance of cooling the stator winding can be improved efficiently.
In addition, by dripping the heat conductive member into the reservoir, heat is generated in both the inner wall of the main body of the insulating bobbin and the stator core (first gap) and in the gap between the insulating bobbin and the stator winding. Since the conductive member can be supplied and it is not necessary to supply both of them separately, the working efficiency is good.

It is a partial front view of the rotary electric machine 100 which has the stator 1 of the rotary electric machine of this embodiment. It is the sectional view on the AA line of FIG. It is the BB sectional drawing of FIG. FIG. 3 is a perspective view for illustrating the configuration of a stator core 2 and insulating bobbins 3. FIG. 5 is a perspective view of the stator core 2 and the insulating bobbin 3 of FIG. 4 as viewed from the direction of an arrow D. FIG. 6 is a perspective view of only the insulating bobbin 3 of FIG. 5. FIG. 3 is a cross-sectional view showing a cooling action of the stator 1. It is a graph which shows the relationship between the filling amount of the heat conductive member W with which the clearance gap between the insulation bobbin 3 and the stator coil | winding 4 is filled, and a thermal resistance reduction rate. It is a graph which shows the relationship between the filling amount of the heat conductive member W with which 1st space | gap S1 is filled, and a thermal resistance reduction rate. (A) is CC sectional view taken on the line of FIG. 1, (b) is sectional drawing which shows the 1st space | gap S1 and the modification 1 of the opening part 12, (c) is 1st space | gap S1 and It is sectional drawing which shows the modification 2 of the opening part.

  Hereinafter, the form which implement | achieves the stator of the rotary electric machine of this invention and the cooling method of the stator of a rotary electric machine is demonstrated based on FIGS.

  1 is a partial front view of a rotary electric machine 100 having a stator 1 of the rotary electric machine according to the present embodiment, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 4 is a cross-sectional view taken along line B-B, FIG. 4 is a perspective view for illustrating the configuration of the stator core 2 and the insulating bobbin 3, and FIG. 5 illustrates the stator core 2 and the insulating bobbin 3 of FIG. FIG. 6 is a perspective view of only the insulating bobbin 3 of FIG. 5.

  As shown in FIG. 1, a plurality of stators 1 (hereinafter simply referred to as “stator 1”) of a rotating electrical machine according to the present embodiment form an annular rotating electrical machine 100 by being connected in the circumferential direction. Yes.

  As shown in FIG. 2, each stator 1 includes a stator core 2 in which a large number of steel plates are laminated, an insulating bobbin 3 that covers the periphery of the stator core 2, and a stator winding wound around the insulating bobbin 3. 4 and a bus bar 5 for connecting the stator winding 4.

  As shown in FIGS. 2 to 6, the insulating bobbin 3 includes a cylindrical insulating bobbin body 6 around which the stator winding 4 is wound, and an inner diameter side flange 7 formed at the inner diameter side end of the stator 1. And an outer diameter side flange 8 formed at the outer diameter side end of the stator 1.

  As shown in FIG. 2 and FIG. 6, a concave portion is provided at the substantially center in the circumferential direction of the stator 1 on the upper and lower surfaces of the inner wall of the main body 6 of the insulating bobbin. Between the inner wall and the stator core 2, the first gaps S 1 and S 1 ′ (the first gap S 1 is above the stator core 2, and the first gap S 1 ′ is below the stator core 2. ) Is formed.

  Further, the first gaps S1 and S1 ′ communicate with a space on the outer side (outer side in the radial direction of the stator 1) than the outer diameter side flange 8.

  As shown in FIGS. 2 to 4, the inner diameter side flange 7 is chamfered over the entire inner circumference contacting the stator core 2 of the inner diameter side flange 7 on the surface side facing the inner diameter side of the stator 1. The escape portion 11 is formed.

  At the upper end of the outer diameter side flange 8, a notch 9 is provided for connecting the stator winding 4 from the bus bar 5 to the main body 6 of the insulating bobbin and for connecting the main body 6 of the insulating bobbin to the bus bar 5. Yes.

  This notch 9 is cut down to a lower side sufficiently wider than the diameter of the stator winding 4. By connecting the stator winding 4 to the upper portion of the notch 9, a part of the notch 9 is formed. (A part of the notch 9 other than the part where the stator winding 4 is connected) and the opening 12 surrounded by the stator winding 4 are formed.

  That is, the opening 12 penetrates the outer diameter side flange 8 and communicates with a space on the outer side than the outer diameter side flange 8 in the same manner as the first gap S1 described above.

  One end of the stator winding 4 is connected to the bus bar 5, and is wound around the body 6 of the insulating bobbin in a plurality of layers through a notch 9 provided in the outer diameter side flange 8. The other end is again connected to the bus bar 5 through the notch 9.

  The bus bar 5 is disposed on the outer side of the insulating bobbin 3 and above the stator core 2, and the inner peripheral surface thereof faces the outer diameter side flange 8. Further, a second gap S2 is provided between the lower surface of the bus bar 5 and the upper surface of the stator core 2, and is a space on the outer side of the outer diameter side flange 8, and is located inside the inner peripheral wall of the bus bar 5. It communicates with the space on the side.

  In a space further outward of the outer diameter side flange 8, a storage portion 10 surrounded by the outer diameter side flange 8, the upper surface of the stator core 2, and the inner peripheral surface of the bus bar 5 is formed.

  That is, the space on the outer side than the outer diameter side flange 8 described above, and the space on the inner side of the inner peripheral wall of the bus bar 5 is the storage portion 10, and the first gap S 1, the opening portion 12, The second gap S2 and the second gap S2 both communicate with the storage unit 10.

  Next, the cooling effect | action of the stator 1 of the rotary electric machine of this embodiment is demonstrated.

  FIG. 7 is a cross-sectional view showing the cooling action of the stator 1.

  When a thermally conductive member W having fluidity is dropped into the reservoir 10 (arrow L shown in FIG. 7), the thermally conductive member W is a first between the inner surface of the main body 6 of the insulating bobbin and the stator core 2. 7 (arrow E shown in FIG. 7), and flows into the gap between the insulating bobbin 3 and the stator winding 4 through the opening 12 (arrow F shown in FIG. 7). Further, the lower surface of the bus bar 5 And the second gap S2 between the upper surface of the stator core 2 (arrow G shown in FIG. 7).

  The thermally conductive member W that has flowed into the first gap S1 fills the entire first gap S1 by capillary action without making the rotating electrical machine 100 slanted or rotating.

  At this time, the heat conductive member W may ooze downward (in the depth direction in FIG. 3) from the main body 6 of the insulating bobbin, the stator core 2 and the contact surface 13 shown in FIG. The heat conductive member W that has oozed out flows into the space on the outer side of the outer diameter side flange 8 (arrow I shown in FIG. 7) through the first gap S1 ′ (arrow H shown in FIG. 7).

  Further, the heat conductive member W filled in the first gap S1 is located on the inner side of the inner diameter side flange 7 from the contact surface between the inner diameter side flange 7 and the stator core 2 shown in FIG. There is a case where it oozes out to the escape portion 11) provided in the flange 7.

  In such a case, as shown in FIG. 4, the heat conductive member W flows downward along the escape portion 11 while accumulating in the escape portion 11 with surface tension (arrow J shown in FIG. 4). ).

  The thermally conductive member W that flows between the insulating bobbin 3 and the stator winding 4 through the opening 12 that is a part of the notch 9 (arrow F shown in FIG. 7) is laminated in a plurality of layers. It flows downward (filled in the gap between the stator windings 4) (arrow K shown in FIG. 7).

  And the heat conductive member W which flowed into 2nd space | gap S2 fills this 2nd space | gap S2 whole by capillarity like the heat conductive member W which flowed into 1st space | gap S1.

  As described above, since the first gap S1, the opening 12, and the second gap S2 communicate with the storage section 10, by dropping the heat conductive member W into the storage section 10, the insulating bobbin The first gap S1 between the inner surface of the main body 6 and the stator core 2, the gap between the insulating bobbin 3 and the stator winding 4, and the second gap between the lower surface of the bus bar 5 and the upper surface of the stator core 2. The heat conductive member W is surely supplied to the gaps in the gaps S2 through the different paths.

  The influence on the cooling performance of the stator winding 4 by supplying the heat conductive member W to the gap between the first gap S1 and the insulating bobbin 3 and the stator winding 4 is shown in the graphs of FIGS. Can be confirmed.

  FIG. 8 is a graph showing the relationship between the filling amount of the thermally conductive member W filling the first gap S1 and the thermal resistance reduction rate. FIG. 9 shows the relationship between the insulating bobbin 3 and the stator winding 4. It is a graph which shows the relationship between the filling amount of the heat conductive member W with which the clearance gap is filled, and a thermal resistance reduction rate.

  When the heat conductive member W is filled in the first gap S1 (between the inner surface of the main body 6 of the insulating bobbin and the stator core 2), as shown in FIG. (In the graph of FIG. 8, since the thermal resistance reduction rate is expressed as a negative number, the numerical value becomes small) is obtained, and the experimental value also shows the same tendency.

  This means that the heat dissipation performance of the stator winding 4 increases and the cooling performance of the stator winding 4 improves as the filling amount of the heat conductive member W supplied to the first gap S1 increases. doing.

  Furthermore, when the gap between the insulating bobbin 3 and the stator winding 4 is filled with the heat conductive member W, as shown in FIG. 9, the thermal resistance reduction rate increases as the filling amount increases (graph of FIG. 9). Then, since the thermal resistance reduction ratio is expressed by a negative number, the calculated value is small), and the experimental value shows the same tendency.

  As in FIG. 8, the heat dissipation performance of the stator winding 4 increases as the filling amount of the heat conductive member W supplied to the gap between the insulating bobbin 3 and the stator winding 4 increases. This means that the cooling performance of the stator winding 4 is improved.

  That is, even when the first gap S1 is filled with the heat conductive member W, even when the gap between the insulating bobbin 3 and the stator winding 4 is filled with the heat conductive member W. In any case, since the cooling performance of the stator winding 4 is improved, the performance of cooling the stator winding 4 is efficiently improved by reliably filling both of them with the heat conductive member W. be able to.

  In addition, the effect of improving the cooling performance of the stator winding 4 by filling the heat conductive member W is not only the first gap S1 and the gap between the insulating bobbin 3 and the stator winding 4. The same effect can be obtained when the second gap S2 is filled.

  Next, the effect of the stator 1 of the rotating electrical machine of the present embodiment will be described.

  According to the stator 1 of the rotating electrical machine according to the present embodiment configured as described above, the insulating bobbin 3 includes the cylindrical insulating bobbin main body 6 around which the stator winding 4 is wound, and the outside of the stator 1. An outer diameter side flange 8 formed on the diameter side end portion and an inner diameter side flange 7 formed on the inner diameter side end portion of the stator 1, and the inner wall of the main body 6 of the insulating bobbin and the stator core 2 A first gap S1 is provided between the outer diameter side flange 8 and the first gap S1. The first gap S1 communicates with a space on the outer side of the outer diameter side flange 8, and is above the upper surface of the stator core 2 of the outer diameter side flange 8. Since the opening that penetrates the outer diameter side flange 8 is formed in the part, both the inner wall of the main body 6 of the insulating bobbin and the stator core 2 and the gap between the insulating bobbin 3 and the stator winding 4 Is filled with the heat conductive member W through a separate and independent path, so that both sides of the heat conductive member can be surely Can be supplied, the performance of cooling the stator winding 4 can be efficiently improved.

  In addition, a bus bar 5 (wall portion) having a surface facing the outer diameter side flange 8 is provided on the outer side of the insulating bobbin 3 and above the stator core 2. Since the storage part 10 for storing the thermally conductive member W having fluidity surrounded by the upper surface of the stator core 2 and the bus bar 5 is formed, the thermal conductive member W is dropped into the storage part 10. As a result, the heat conductive member W is supplied to both the inner wall of the main body 6 of the insulating bobbin and the stator core 2 (first gap S1) and the gap between the insulating bobbin 3 and the stator winding 4. Since it is not necessary to supply both of them separately, work efficiency is good.

  Furthermore, since the surface of the bus bar 5 facing the outer diameter side flange 8 is the inner peripheral surface of the bus bar 5 for connecting the stator winding 4, a space for storing the dropped heat conductive member W is separately provided. It can be formed without using other members, and an increase in the number of parts can be prevented.

  And since the 2nd space | gap S2 is provided between the lower surface of the bus-bar 5 and the upper surface of the stator core 2, and since 2nd space | gap S2 is connected to the storage part 10, it is in 2nd space | gap S2. Since the heat conductive member W can be filled, the heat dissipation performance of the stator winding 4 connected to the bus bar 5 can be enhanced, and the cooling performance of the stator winding 4 can be further improved.

  In addition, on the surface side of the inner diameter side flange 7 facing the inner diameter side of the stator 1, a relief portion 11 by chamfering is formed over the entire inner circumference contacting the stator core 2 of the inner diameter side flange 7. Therefore, the heat conductive member W that has oozed out of the first gap S1 is prevented from adhering to the inner diameter side end of the stator core 2, and masking and removal work of the heat conductive member W become unnecessary.

  In the stator 1 of the rotating electrical machine according to the present embodiment, the first gaps S1 and S1 ′ provided between the inner wall of the main body 6 of the insulating bobbin and the stator core 2 are the main body 6 of the insulating bobbin. The case where it formed by providing a recessed part in the upper surface and lower surface among the inner walls of was demonstrated.

  However, in the stator 1 of the rotating electrical machine according to the present invention, it is only necessary to form a gap between the inner wall of the main body 6 of the insulating bobbin and the stator core 2, and it is not always necessary to provide a recess.

  Furthermore, in the stator 1 of the rotating electrical machine according to the present embodiment, as shown in FIG. 10A (FIG. 10A is a cross-sectional view taken along the line CC in FIG. 1), A part of which is used as the opening 12 has been described.

  In such a configuration, since the opening 12 can be formed in the outer diameter side flange 8 simply by extending the existing notch 9 to the vicinity of the main body 6 of the insulating bobbin, the opening 12 is completely new. It is preferable that it is not required to be provided.

  However, the stator 1 of the rotating electrical machine according to the present invention is not limited to such a form. For example, as shown in FIGS. 10B and 10C, the stator 1 is located at a position different from the notch 9. A configuration in which the opening 12 is provided is also possible.

  Furthermore, in the stator 1 of the rotating electrical machine according to the present embodiment, as shown in FIGS. 2 and 7, the second gap S <b> 2 is provided between the lower surface of the bus bar 5 (wall portion) and the upper surface of the stator core 2. However, the stator 1 of the rotating electrical machine according to the present invention is not limited to such a configuration, and the opening 12 provided in the outer diameter side flange 8 and the first As long as it has the gap S1, the second gap S2 may not be provided.

  Further, in the stator 1 of the rotating electrical machine according to the present embodiment, the case where the inner peripheral surface of the bus bar 5 for connecting the stator winding 4 constitutes a part of the storage portion 10 has been described. The stator 1 of the rotating electrical machine according to the invention does not necessarily need to have such a bus bar 5, for example, a wall that constitutes a part of the reservoir 10 by extending a part of the insulating bobbin 3. It is also possible to provide a configuration in which a portion is provided.

  As mentioned above, although the stator of the rotary electric machine of this invention has been demonstrated based on this embodiment, about a specific structure, it is not restricted to this embodiment, The invention which concerns on each claim of a claim Design changes and additions are permitted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Stator of rotary electric machine 2 Stator iron core 3 Insulating bobbin 4 Stator winding 5 Bus bar 6 Insulating bobbin main body 7 Inner diameter side flange 8 Outer diameter side flange 10 Storage part 11 Escape part 12 Opening part S1, S1 '1st Air gap S2 Second air gap

Claims (8)

In a stator of a rotating electric machine comprising a stator core, an insulating bobbin that covers the periphery of the stator core, and a stator winding wound around the insulating bobbin,
The insulating bobbin is formed at a cylindrical main body around which the stator winding is wound, an outer diameter side flange formed at an outer diameter side end portion of the stator, and an inner diameter side end portion of the stator. And an inner diameter side flange,
A first gap is provided between the inner wall of the main body and the stator core, and the first gap communicates with a space on the outer side than the outer diameter side flange,
Is opening the front through the Kigai diameter flange formed, the bottom of the opening is in the upper part than the upper surface at the time of filling the heat conductive member having a fluidity of the stator core,
A wall portion having a surface facing the outer diameter side flange is erected on the outer side from the insulating bobbin and above the stator core,
A stator for a rotating electrical machine , wherein a storage portion for storing the thermally conductive member surrounded by the outer diameter side flange, an upper surface of the stator core, and the wall portion is formed . The stator of the rotating electrical machine according to claim 1 , wherein a surface of the wall portion facing the outer diameter side flange is an inner peripheral surface of a bus bar for connecting the stator winding. Second void is provided between the upper surface of the lower surface and the stator core of the wall portion, the second air gap, according to claim 1 or claims characterized in that it communicates with the reservoir Item 3. A rotating electrical machine stator according to Item 2 . Of the inner diameter side flange, on the surface side facing the inner diameter side of the stator, a relief portion by chamfering is formed over the entire inner periphery of the inner diameter side flange in contact with the stator core. The stator for a rotating electrical machine according to any one of claims 1 to 3 , wherein: In a stator of a rotating electric machine comprising a stator core, an insulating bobbin that covers the periphery of the stator core, and a stator winding wound around the insulating bobbin,
The insulating bobbin is formed at a cylindrical main body around which the stator winding is wound, an outer diameter side flange formed at an outer diameter side end portion of the stator, and an inner diameter side end portion of the stator. And an inner diameter side flange,
A first gap is provided between the inner wall of the main body and the stator core, and the first gap communicates with a space on the outer side than the outer diameter side flange,
An opening that penetrates the outer diameter side flange is formed, and the lowermost part of the opening is in a portion above the upper surface when filling the thermally conductive member having fluidity in the stator core,
Of the inner diameter side flange, on the surface side facing the inner diameter side of the stator, a relief portion by chamfering is formed over the entire inner circumference contacting the stator core of the inner diameter side flange.
A stator of a rotating electrical machine. The stator of the rotating electrical machine according to any one of claims 1 to 5, wherein the inner wall of the main body and the stator core are separated from a space on the outer side than the outer diameter side flange. said first gap formed between, to fill the thermally conductive member,
The stator of a rotating electrical machine is characterized in that the thermally conductive member is filled between the stator winding and the insulating bobbin from the opening formed in the outer diameter side flange of the insulating bobbin. Cooling method. A wall portion having a surface opposed to the outer diameter side flange is provided on the outer side of the insulating bobbin and above the stator core, and the upper surface of the outer diameter side flange and the stator core And supplying the thermally conductive member to the storage part of the stator in which the storage part surrounded by the wall part is formed,
While letting the thermal conductive member supplied to the storage part flow into the first gap,
7. The rotating electrical machine according to claim 6, wherein the thermally conductive member supplied to the storage portion is caused to flow between the stator winding and the insulating bobbin through the opening. Stator cooling method. The heat conductive member supplied to the storage portion is caused to flow into a second gap provided between the lower surface of the wall portion and the upper surface of the stator core. Method for cooling the stator of a rotating electric machine.

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