JP5126253B2 - Rotating machine stator - Google Patents

Description

  The present invention relates to a stator of a rotating machine, and more particularly to a shape of an insulating bobbin that is fitted onto a stator iron core of a rotating machine to wind a stator winding.

  The rotating machine includes a stator fixed in a case and a columnar rotor rotatably attached to a rotating shaft. The stator includes a cylindrical stator core and a stator winding, and an insulating bobbin is fitted into a tooth portion (pole tooth portion) constituting the stator core, and the stator winding includes the insulating bobbin. It is comprised so that it may wind around a teeth part.

  Here, the insulating bobbin includes a coil winding portion of a rectangular frame fitted into a tooth portion having a rectangular cross section, an inner flange portion and an outer portion integrally provided along the inner peripheral edge and the outer peripheral edge of the coil winding portion. The coil winding portion of the rectangular frame is formed of a flange portion, and the coil end portion where the end portion of the stator winding is positioned and the side surface portion of the slot forming a winding slot for insulating and winding the stator winding And a corner portion connected to each other. In this corner part, the insulation bobbin and the stator winding are in strong contact with each other due to the tension when the stator winding is wound, and the insulation coating of the stator winding is damaged, or the stator Insulating bobbins may be damaged (compression dents) by pressing the windings. As a result, insulation failure of the stator windings and breakage of the inner flange starting from the damaged portion of the insulating bobbin due to large stress in the magnetization process.

  Further, since the slot side surface portion of the insulating bobbin is generally formed with a small thickness, it is difficult to release at the time of molding, and cracks are likely to occur in the corner portion, and insulation failure of the insulating bobbin is likely to occur.

  In order to solve such a problem, for example, in Japanese Patent No. 3679305 “refrigerant compressor” of Patent Document 1, the winding of the stator winding is bent with respect to the corner portion of the coil winding portion of the insulating bobbin in the direct winding method. In order to alleviate the stress caused by the above, a proposal has been made to chamfer the corner portion of the coil winding portion with a circular arc shape that is not less than (1/2) of the wire diameter of the stator winding and not more than 4 times. Yes. By performing chamfering as described above, damage to the insulating coating and the bobbin of the stator winding is improved, and it is possible to prevent insulation failure and breakage of the insulating bobbin when magnetized.

Japanese Patent No. 3679305

  However, as described in Patent Document 1, arc-shaped chamfering that is not less than (1/2) of the wire diameter of the stator winding and not more than 4 times the corner of the coil winding portion of the insulating bobbin. Even if it is applied, the corner portion has been chamfered with only a single arc shape. Therefore, when the stator winding is folded and wound around the chamfered corner portion, the stator In the slot side surface forming the winding slot of the stator winding and the coil end portion where the end of the stator winding is located by the reaction force of the winding, a so-called gap is formed between the insulating bobbin and the stator winding. An air gap called “rolling thick” is generated. Since the gap generated as “thickening of the winding” has low thermal conductivity, the heat generated in the stator winding is not dissipated and remains in the stator winding as it is. For this reason, the space factor of a stator winding | coil cannot be improved and there exists a problem that the output torque performance of a rotary machine will deteriorate.

  The present invention has been made in view of such circumstances, and by preventing the generation of a gap between the insulating bobbin and the stator winding and suppressing the heat generation in the stator winding, the stator winding An object of the present invention is to provide a stator for a rotating machine that can improve the space factor and improve the output torque performance of the rotating machine.

In order to solve the above-mentioned problems, the present invention has a shape of the corner portion of the insulating bobbin at least between the vertex on the long side and the vertex on the short side of the ellipse whose arc radius continuously changes ( It is characterized by having a curved surface shape using an elliptical arc of 1/4) circumference.

According to the stator of the rotating machine of the present invention, the shape of the corner portion of the insulating bobbin is at least (1 between the long-side vertex and the short-side vertex of the ellipse whose arc radius continuously changes. / 4) Since it has a curved surface shape using an elliptical arc of the circumference, it is possible to reduce the possibility that a gap due to so-called "winding thickening" occurs between the stator winding and the insulating bobbin, By reducing the heat resistance and suppressing the heat generation of the stator winding, the space factor (accommodating volume) of the stator winding can be improved and the output torque performance of the rotating machine can be improved.

It is a perspective view which shows an example of the structure of the upper half of the insulation bobbin applied to the stator of the rotary machine by this invention. It is sectional drawing which shows the cross-section of the insulation bobbin in 1st Embodiment of the stator of the rotary machine by this invention. FIG. 3 is a structural diagram showing an experimental example of an insulating bobbin in the first embodiment of the stator of the rotating machine according to the present invention. It is explanatory drawing for demonstrating the reduction effect of the winding thickness by the insulation bobbin structure of FIG. It is explanatory drawing for demonstrating the reduction effect of the thermal resistance by the insulation bobbin structure of FIG. It is sectional drawing which shows the cross-section of the insulation bobbin in 2nd Embodiment of the stator of the rotary machine by this invention. It is a structural diagram showing an experimental example of an insulating bobbin in the present embodiment. It is explanatory drawing for demonstrating the reduction effect of the thermal resistance by the insulation bobbin structure of FIG. It is sectional drawing which shows the cross-section of the insulation bobbin in 3rd Embodiment of the stator of the rotary machine by this invention.

  Hereinafter, embodiments of a stator of a rotating machine according to the present invention will be described in detail with reference to the drawings.

  A rotating machine to which the present invention is applied includes a stator fixed in a case, and a cylindrical rotor that is disposed inside the stator via a predetermined gap and rotates around a rotating shaft. ing. The stator is composed of a cylindrical stator core and a stator winding. In general, an insulating bobbin is fitted into a tooth portion (pole tooth portion) constituting the stator core, and the stator winding is As a direct winding method, it is configured to be wound around the teeth portion via the insulating bobbin.

Here, the insulating bobbin applied to the stator of the rotating machine according to the present invention has a structure as shown in FIG. FIG. 1 is a perspective view showing an example of the structure of an upper half of an insulating bobbin applied to a stator of a rotating machine according to the present invention.

As shown in FIG. 1 , the insulating bobbin includes a coil winding portion 10 for winding a stator winding, an inner flange 20 attached to the coil winding portion 10 along an inner peripheral edge of the stator (stator), a stator ( It is comprised from the outer side collar part 30 attached to the coil winding part 10 along the outer periphery of a stator. The coil winding part 10 has a rectangular frame shape whose lower surface is fitted into a tooth part (pole tooth part) having a rectangular cross section constituting the stator core.

  In addition, the coil winding portion 10 includes a coil end portion 11 where the end of the stator winding is located, a slot side surface portion 12 that forms a winding slot for the stator winding, and the coil end portion 11 and the slot side surface portion 12. It consists of a corner portion 13 for connecting to the. The stator winding wound around the coil winding portion 10 is bent at a corner portion 13 connected to the end portion from the coil end portion 11 on the upper surface, wound around the slot side surface portion 12, and the teeth portion (pole teeth). Part) is returned to the slot side face 12 opposite to the previous face through the lower half of the insulating bobbin fitted in the position on the opposite side, and is bent at the corner 13 to be coiled on the upper face. By winding around the end portion 11, a first winding is formed, and thereafter, winding is repeated a required number of times, and a stator winding having a required number of turns is obtained.

  In the following description, the structure of the insulating bobbin of FIG. 1 mounted on the stator of the rotating machine will be described in detail with reference to a cross-sectional view of the coil winding portion 10 when viewed from the direction of arrow A in FIG. explain.

(First embodiment)
First, a first embodiment of a stator of a rotating machine according to the present invention will be described with reference to FIG. FIG. 2 is a cross-sectional view showing a cross-sectional structure of the insulating bobbin in the first embodiment of the stator of the rotating machine according to the present invention, and shows the coil winding portion 10 of the insulating bobbin as viewed from the direction of arrow A shown in FIG. A cross-sectional structure is shown.

  As shown in FIG. 2, in the present embodiment, the shape of the corner portion 13 of the coil winding portion 10 is not chamfered only by a single arc shape as in the prior art, but the coil end portion 11 on the upper surface side. A curved surface shape in which a plurality of arcs (at least two arcs) in which the radial radius of the corner portion 13 is sequentially changed from each other toward the side slot side portion 12 are smoothly connected to each other. Shows an example in which chamfering is performed to obtain a curved surface shape in which a plurality of curved surfaces having different curvature radii are combined. For example, it is formed as a curved surface in which a plurality of circular arcs with successively increasing radii are smoothly connected from the coil end portion 11 toward the slot side surface portion 12.

  FIG. 2 shows a case where two arcs are used. The corner portion 13 is divided into an arc r1 at a position close to the coil end portion 11 on the upper surface side and an arc r2 at a position close to the slot side surface portion 12 on the side surface side. The example which joins between two circular arcs with a smooth curved surface is shown. Here, for example, the radius of the arc r2 near the slot side surface 12 having a larger surface is larger than the radius of the arc r1 near the coil end portion 11 on the surface smaller than the slot side surface 12. Let the radius be

  As shown in FIG. 2, the radius of the arc r2 near the slot side surface portion 12 is larger than the radius of the arc r1 near the coil end portion 11, and the curved surface shape is smoothly connected between the arcs. By forming the corner portion 13, when the stator winding is bent at the corner portion 13, the reaction force of the stator winding is closer to the slot side surface portion 12 having a larger radius than the coil end portion 11 side. Will be weakened.

  As a result, the stator winding can be bent so as to be in close contact with the slot side surface portion 12, and a gap is generated between the slot side surface portion 12 having a surface larger than the coil end portion 11 and the stator winding. Can be difficult. In other words, the so-called “thickening of the winding” can be reduced to make it difficult for a gap to be generated between the insulating bobbin and the stator winding. Thus, the thickness of the gap (air layer) having a low heat transfer coefficient is reduced, so that the thermal resistance can be lowered and the output torque performance of the rotating machine can be improved.

  For example, when the corner portion having the structure as shown in FIG. 3 is formed as an experimental example of the present embodiment, the effect of reducing the winding thickness as shown in FIG. 4 is obtained. As a result, the thermal resistance as shown in FIG. A reduction effect can be obtained.

  FIG. 3 is a structural diagram showing an experimental example of the insulating bobbin in the present embodiment, and FIG. 4 is an explanatory diagram for explaining the effect of reducing the winding thickness by the insulating bobbin structure of FIG. FIG. 5 is an explanatory diagram for explaining the effect of reducing thermal resistance by the insulating bobbin structure of FIG. 3. In addition, in the explanatory view explaining the thickening reduction effect of FIG. 4, in order to compare with the effect of the insulating bobbin of this embodiment, the conventional example in the case where the corner portion is formed by a single circular arc shape having a radius of 3 mm is also shown. In addition, the experimental results of three experimental examples are shown.

  Here, as shown in FIG. 3, the structure of the insulating bobbin in the present experimental example is such that the radius of the arc r1 near the coil end portion 11 is 2 mm and the radius of the arc r2 near the slot side portion 12 is 9 mm. The corner portion 13 is formed with the height of the corner portion 13 (that is, the vertical interval from the coil end portion 11 on the upper surface to the upper end portion of the slot side surface portion 12) being 4 mm.

  As shown in FIG. 3, when the corner portion 13 has a smooth curved surface formed by two arcs r1 and r2 having different radii, the gap between the stator winding and the insulating bobbin due to thick winding is illustrated in FIG. As shown in FIG. 4, the largest gap was due to thickening and was 0.28 mm. On the other hand, in the case of the conventional insulating bobbin in which the corner portion is formed by a single arc (radius 3 mm), even when the gap due to the thickest winding is the smallest, it is 0.55 mm. Even when compared to the case of the largest number, a gap having a thickness approximately twice as large is generated.

  As shown in FIG. 4, by forming the corner portion 13 having a curved surface shape in which a plurality of arcs having different radii are smoothly connected, the corner portion is formed by a single arc as in the prior art. And the thickness of the space | gap by winding thickening can be reduced significantly.

  As a result, as shown in FIG. 5, in the present experimental example, even in the case of a gap of 0.28 mm with the largest gap due to winding thickening, the conventional example (having a radius of 3 mm with a gap of 0.55 mm with the smallest gap due to winding thickening). Compared with the case of the corner portion), the thermal resistance can be reduced by about 28%.

  As described above, the radial radii of the plurality of arcs for forming the corner portion 13 are gradually changed from the coil end portion 11 on the upper surface toward the slot side surface portion 12 on the side surface, and the space between the arcs is smoothly changed. By forming the curved curved corner portions 13 connected, the width of the gap due to the winding thickening can be reduced and the thermal resistance can be reduced, so that the space factor of the stator windings can be improved. The output torque performance can be improved.

(Second Embodiment)
Next, a second embodiment of the stator of the rotating machine according to the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view showing a cross-sectional structure of an insulating bobbin in the second embodiment of the stator of the rotating machine according to the present invention, and shows the coil winding portion 10A of the insulating bobbin as viewed from the direction of arrow A shown in FIG. A cross-sectional structure is shown.

  As illustrated in FIG. 2 described as the first embodiment, the curved surface shape is formed by gradually changing the radius of the arc forming the corner portion 13 from the coil end portion 11 on the upper surface toward the slot side surface portion 12 on the side surface. Even in this case, as shown in the experimental results of FIG. 4 (in the experimental example of the curved surface shape using two circular arcs of 2 mm and 9 mm, a gap of 0.28 mm at maximum remains) However, there is a case in which the thermal resistance cannot be sufficiently reduced since the air gap due to "

  In this embodiment, in order to improve such a situation, before the stator winding is actually wound around the insulating bobbin, the amount of air gap that may be generated due to winding thickening is predicted in advance, and The case where the thickness setting part is formed in both the coil end part 11 on the upper surface of the insulating bobbin and the slot side part 12 on the side is shown by the amount.

  That is, in the coil winding portion 10A shown in FIG. 6, not only the curved corner portion 13 formed by changing the radius of the arc in stages, but also the coil end portions 11 on the upper surface and the lower surface include the corresponding portion. Thickness setting portions 11a and 11b corresponding to the amount of gaps due to thickening in winding are formed integrally with the respective coil end portions 11, and the right side surface and the left side slot side surface portion 12 are wound at the corresponding portion. The thickness setting portions 12a and 12b corresponding to the amount of the gap due to the fat are integrated with each slot side surface portion 12.

  Here, as described above, the thicknesses of the wall thickness setting units 11a and 11b and the wall thickness setting units 12a and 12b correspond to the thicknesses that are predicted as the amount of voids generated due to the thickening of the windings in each part. Therefore, the shape of each surface of the wall thickness setting parts 11a, 11b and the wall thickness setting parts 12a, 12b is a smooth curved surface, and the thickness at the part in contact with the corner part 13 is zero. As the distance from the central portion of the portion 11 and the central portion of the slot side surface portion 12 approaches, the thickness increases.

  In addition, each of thickness setting part 11a, 11b and thickness setting part 12a, 12b and the corner part 13 are arrange | positioned so that the tangent direction of each curved surface may mutually become the same, and it connects smoothly. .

  Further, depending on the amount of air gap expected to be generated, both the coil end portion 11 and the slot side surface portion 12 are provided with the thickness setting portions 11a and 11b and the thickness setting portions 12a and 12b, respectively. Or, depending on circumstances, it may be provided only in one of them.

  As described above, each of the coil end portion 11 and the slot side surface portion 12 has a thickness setting portion 11a, 11b having a thickness corresponding to the amount of voids expected to be generated due to the thickening of winding in each portion, and the thickness setting portion. By integrally forming 12a and 12b, the gap between the gaps can be made narrower than the gap due to thick winding described in the first embodiment, and the thermal resistance can be further reduced. As a result, the space factor of the stator winding can be further improved, so that the output torque performance of the rotating machine can be further improved.

  For example, when a corner portion having a structure as shown in FIG. 7 is formed as an experimental example of this embodiment, the effect of reducing thermal resistance as shown in FIG. 8 can be obtained.

  FIG. 7 is a structural diagram showing an experimental example of the insulating bobbin in the present embodiment, and FIG. 8 is an explanatory diagram for explaining the effect of reducing the thermal resistance by the insulating bobbin structure of FIG.

  As shown in FIG. 7, as the structure of the insulating bobbin in this experimental example, the shape of the corner portion is set to 2 mm as the radius of the arc r1 near the coil end portion 11 as in the case of FIG. In addition to setting the radius of the arc r2 at a position close to 12 to 9 mm and the height of the corner 13 to 4 mm, each of the coil end portion 11 and the slot side surface portion 12 has a curved surface with a radius of 71 mm. The setting portions 11a and 11b and the curved wall thickness setting portions 12a and 12b formed by arcs having a radius of 1270 mm are integrally formed.

  Here, the arc r1 having a radius of 2 mm forming the corner portion 13 close to the coil end portion 11 and the arc having a radius of 71 mm of the wall thickness setting portions 11a and 11b are smoothly connected with the tangential direction as the same direction, and the side surface portion of the slot An arc r2 having a radius of 9 mm that forms a corner portion 13 close to 12 and an arc having a radius of 1,270 mm of the wall thickness setting portions 12a and 12b are smoothly connected with the tangential direction as the same direction.

  As shown in FIG. 7, in addition to making the corner portion 13 a smooth curved surface shape by two arcs r1 and r2 having different radii, it is predicted that the surface shapes of the coil end portion 11 and the slot side surface portion 12 are caused by winding thickening. As a result of an experiment with a smooth curved surface shape that adds a wall thickness that compensates for the amount of air gap generated, the gap generated between the stator winding and the insulating bobbin due to thick winding is the largest due to the thick winding. Even so, it was significantly reduced to 0.05 mm. That is, it becomes about (1/10) of the case where the gap is the smallest (gap of 0.55 mm) in the case of the conventional insulating bobbin in which the corner portion is formed by a single arc (radius of 3 mm), and in FIG. In the case of the experimental example of the first embodiment, the gap is reduced to about (1/6) that when the gap is the largest (the gap of 0.28 mm), and the gap can be suppressed to an extremely narrow width.

  As a result, as shown in FIG. 8, in the present experimental example, even when the gap is 0.05 mm when the gap due to thickening is the largest, the conventional gap is 0.55 mm when the gap due to thickening is the smallest. Compared to the case of the example (a corner portion having a radius of 3 mm), the thermal resistance can be reduced to about 49%.

  As described above, the curved corner portion 13 in which the radius in the radial direction of the arc is changed stepwise is formed, and at the same time, the voids that are expected to be generated on the surfaces of the coil end portion 11 and the slot side surface portion 12 due to winding thickening. By integrally forming the wall thickness setting portions 11a and 11b and the wall thickness setting portions 12a and 12b, which have a smooth curved surface shape to which the wall thickness is added to compensate for the amount of the gap, the width of the gap due to winding thickening is greatly reduced. Since the thermal resistance can be further reduced, the output torque performance of the rotating machine can be further improved by further improving the space factor of the stator winding.

  In the above-described embodiment, the thickness setting portions 11a and 11b and the thickness setting portions 12a and 12b have been described as being integrally formed separately from the coil end portion 11 and the slot side surface portion 12. In order to form, the thickness setting portions 11a and 11b and the coil end portion 11 are not limited to the case where the thickness setting portions 12a and 12b and the slot side surface portion 12 are attached to each other. 11. Needless to say, the main body of the slot side surface portion 12 may be formed in a shape having a thick curved surface.

(Third embodiment)
Next, a third embodiment of the stator of the rotating machine according to the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view showing a cross-sectional structure of the insulating bobbin in the third embodiment of the stator of the rotating machine according to the present invention, and shows the coil winding portion 10B of the insulating bobbin as viewed from the direction of arrow A shown in FIG. A cross-sectional structure is shown.

  In the present embodiment, the shape of the corner portion 13 described in the first embodiment, the thickness setting portions 11a and 11b, and the thickness setting portions 12a and 12b described in the second embodiment are further different from each other. To do. That is, in FIG. 9, the shape of the corner portion 13A is an elliptical shape corresponding to the case where the radius of the arc continuously changes, and the ratio between the long side width and the short side width of the ellipse is within a predetermined range. And / or the thickness setting portions 11a and 11b, the coil end portion 11 in which the thickness setting portions 12a and 12b are integrally formed, and the maximum thickness and the minimum thickness of the slot side surface portion 12. In the case where the surface shapes of the wall thickness setting portions 11a and 11b and the wall thickness setting portions 12a and 12b are set to curved surface shapes so that the difference between them falls within a predetermined range, both are shown.

  Also in this embodiment, each of the wall thickness setting parts 11a and 11b and the wall thickness setting parts 12a and 12b and the corner part 13A are arranged so that the tangent directions of the curved surfaces are the same, and smooth. Connect to.

  First, the shape of the corner portion 13A will be described. The corner portion 13A in the coil winding portion 10B shown in FIG. 9 is different from the curved surface shape in which circular arcs having different radii are connected by a smooth curved surface, like the corner portion 13 in FIG. 3 of the first embodiment. It is formed into a curved surface shape using an elliptical arc of approximately (1/4) circumference between the apex on the side and the apex on the short side. Further, the corner portion 13A having a curved surface shape using an elliptical arc has a short side in the vertical direction (in the horizontal direction of the coil winding portion 10B (that is, the direction parallel to the coil end portion of the surface smaller than the side surface portion of the slot)). That is, it is formed in an elliptical shape in which the long side is arranged in a direction parallel to the slot side surface having a large surface.

Here, when the long side width of the elliptical shape is A and the short side width is B, the ratio of A: B is the coil end portion 11 and / or the slot side surface portion 12 when the stator winding is wound. Is set to a ratio within a predetermined range based on the amount of air gap that is predicted to be generated due to thickening. For example, in order to sufficiently reduce the thickness of the void accompanying the thickening due to the curved shape of the corner portion 13A and sufficiently suppress the increase in thermal resistance, the ratio of A: B is
(4: 1) to (6: 1)
It is desirable to set the ratio within the range of
A: B≈5: 1
Most desirable.

  Furthermore, the coil winding part 10B shown in FIG. 9 also shows an example different from the second embodiment of the thickness setting parts 11a and 11b and the thickness setting parts 12a and 12b.

  Also in the case of FIG. 9, the shape of the surface of the thickness setting portions 11 a and 11 b and / or the thickness setting portions 12 a and 12 b that form the surface shape of the coil end portion 11 and / or the slot side surface portion 12 is the second shape. As in the case of the embodiment, the shape is a curved surface. However, in the case of the present embodiment shown in FIG. 9, the coil end portion 11 and / or the slot side surface portion 12 including the integrally formed thickness setting portions 11a and 11b and / or the thickness setting portions 12a and 12b, respectively. Of the thicknesses at the respective portions, the difference between the maximum thickness and the minimum thickness is wound around the coil end portion 11 and / or the slot side surface portion 12 when the stator winding is wound. The case where it sets to the value within the range defined beforehand based on the quantity of the space | gap estimated to generate | occur | produce by is shown.

  That is, as the surface shape of the thickness setting portions 11a and 11b formed integrally with the coil end portion 11, the thickness of the coil end portion 11 up to the apex a on the central portion of the coil end portion 11 that is the thickest, that is, the maximum thickness. The difference between the thickness T1 and the thickness of the coil end portion 11 up to the connection point b with the end portion of the coil end portion 11 where the wall thickness is the smallest, that is, the corner portion 13A, that is, the minimum thickness T2, is a predetermined range. In addition to being a value that fits within, it is formed so as to have a smooth curved surface shape including the connecting portion with the corner portion 13A.

  For example, as the curved surface shape of the surface of the coil end part 11 integrated with the thickness setting parts 11a and 11b, three points of the apex a on the central part of the coil end part 11 and the connection point b between the corner parts 13A at both ends are provided. You may make it make it the circular arc shape to pass.

  As described above, the difference between the maximum wall thickness T1 and the minimum wall thickness T2 is set to a value that falls within a predetermined range. However, the gap due to the thickening due to the curved surface shape of the surface of the coil end portion 11 is used. In order to sufficiently reduce the thickness and suppress the increase in thermal resistance, it is desirable to set the difference between the maximum thickness T1 and the minimum thickness T2 to about 0.1 to 0.3 mm.

  Similarly, as the surface shape of the thickness setting portions 12a and 12b formed integrally with the slot side surface portion 12, the thickness of the slot side surface portion 12 up to the vertex c on the central portion of the slot side surface portion 12 that is the thickest, that is, the maximum The difference between the thickness t1 and the thickness of the slot side surface portion 12 up to the end of the slot side surface portion 12 where the wall thickness is the smallest, that is, the connection point d with the corner portion 13A, that is, the minimum thickness t2, is determined in advance. The value is set to fall within the range, and is formed to have a smooth curved surface shape including the connection portion with the corner portion 13A.

  For example, as the curved surface shape of the surface of the slot side surface portion 12 integrated with the thickness setting portions 12a and 12b, as in the case of the coil end portion 11, the apex c on the center portion of the slot side surface portion 12 and the corner portions at both ends You may make it make it the circular arc shape which passes 3 points | pieces of the connection point d with 13A.

  As described above, the difference between the maximum wall thickness t1 and the minimum wall thickness t2 is a value that falls within a predetermined range. However, the gap due to the winding thickening due to the curved surface shape of the surface of the slot side surface portion 12 is used. In order to sufficiently suppress the increase in thermal resistance by reducing the thickness, the difference between the maximum thickness t1 and the minimum thickness t2 is also 0.1 to 0.3 mm as in the case of the coil end portion 11 side. It is desirable to set the degree.

  Here, the thickness setting portions 11a and 11b and the thickness setting portions 12a and 12b are provided on both the coil end portion 11 and the slot side surface portion 12, respectively, depending on the amount of voids generated due to thickening. Or, depending on circumstances, it may be provided only in one of them.

  As in the coil winding portion 10B shown in FIG. 9, the shape of the corner portion 13A is an elliptical shape in which the radius of the arc continuously changes, and the ratio between the long side width A and the short side width B of the ellipse is determined in advance. And / or the wall thickness setting portions 11a and 11b and the wall thickness setting portions 12a and 12b are integrally formed with the coil end portion 11 and the maximum thickness of the slot side surface portion 12, respectively. By making the curved surface shape such that the difference between the thickness and the minimum thickness falls within a predetermined range, the same effect as in the first and second embodiments can be obtained. That is, since the gap width due to the winding thickness can be reduced and the thermal resistance can be reduced, the output torque performance of the rotating machine can be improved by improving the space factor of the stator winding.

  Also in this embodiment, as in the case of the second embodiment, the thickness setting portions 11a and 11b and the thickness setting portions 12a and 12b are separated from the coil end portion 11 and the slot side surface portion 12 and are integrally formed. As described above, in order to integrally form the thickness setting portions 11a and 11b and the coil end portion 11, the thickness setting portions 12a and 12b and the slot side surface portion 12 are attached to each other. Needless to say, the main body of the coil end portion 11 and the slot side surface portion 12 may be formed in a shape having a thick curved surface shape.

DESCRIPTION OF SYMBOLS 10, 10A, 10B ... Coil winding part, 11 ... Coil end part, 11a, 11b ... Thickness setting part, 12 ... Slot side face part, 12a, 12b ... Thickness setting part, 13, 13A ... Corner part, 20 ... Inside A collar part, 30 ... Outer collar part, A ... Long side width, a, c ... Vertex, B ... Short side width, b, d ... Connection point, r1, r2 ... Arc. T1, t1 ... maximum wall thickness, T2, t2 ... minimum wall thickness.

Claims (7)

A stator of a rotating machine comprising a stator core and a stator winding wound around the stator core via an insulating bobbin,
The coil winding portion of the insulating bobbin, the coil end portion which ends of the stator winding is located, the slot side section and the coil end forming a winding slot of the stator winding for winding the stator winding parts and, with the slot side portion and the corner portion for connecting with a smooth curved surface, Ri Tona,
The shape of the corner portion is a curved surface shape using an elliptic arc of at least (1/4) rounds between the long side vertex and the short side vertex of an ellipse whose arc radius continuously changes. ,
A stator for a rotating machine. In the stator of the rotating machine according to claim 1,
The curved surface shape using the elliptical arc of the corner part is a shape in which the short side of the elliptical arc is arranged in a direction parallel to the coil end part.
A stator for a rotating machine. In the stator of the rotating machine according to claim 2,
The ratio between the long side of the width and the short side width of the elliptical shape of the corner portion, when the winding the stator winding, caused by wound expansion in the coil end portion and / or the slot side section Set to a ratio within a predetermined range based on the amount of voids expected
A stator for a rotating machine. In the stator of the rotating machine according to claim 3,
The ratio of the long side width and the short side width of the elliptical shape of the corner is set to a ratio within the range of 4: 1 to 6: 1.
A stator for a rotating machine. In the stator of the rotating machine according to any one of claims 1 to 4,
When the stator winding is wound, the coil end portion and / or the coil end portion and / or the thickness of the coil end portion and / or the slot side surface portion is compensated for by the thickness of the gap that is expected to be generated by winding thickening Or forming the surface of the side surface of the slot,
A stator for a rotating machine. In the stator of the rotating machine according to any one of claims 1 to 4,
The surface of the coil end portion and / or the slot side surface portion has a curved surface shape, and the maximum thickness and the minimum thickness among the thicknesses of the coil end portion and / or the slot side surface portion. When the stator winding is wound, the difference from the wall thickness is within a range determined in advance based on the amount of air gap that is predicted to be generated by winding thickening at the coil end portion and / or the side surface portion of the slot. Set to value,
A stator for a rotating machine. In the stator of the rotating machine according to claim 5 or 6,
The curved surface shape formed on the surface of the coil end portion and / or the side surface portion of the slot and the curved surface shape formed on the corner portion are shapes that are in the same tangential direction at each connecting portion.
A stator for a rotating machine.