JP6168677B1 - Interphase insulating paper, stator core and coil insertion machine - Google Patents

Abstract

To provide an interphase insulating paper, a stator core, and a coil insertion machine in which a coil wire is difficult to leak into an adjacent phase in a slot not only at the time of coil insertion but also at the end processing of a coil end portion. Interphase insulating paper is formed by folding a sheet of thin sheet having electrical insulation into two so as to form a symmetrical shape, and both ends of the interphase insulating paper extend along the flange portion. An inner-diameter side bent portion that is bent so as to protrude sideways, and an outer-diameter side bent portion that is overlapped and bent so as to protrude to both sides at the center portion of the interphase insulating paper. Each of the inner diameter side bent portion and the outer diameter side bent portion is brought into contact with a first insulating paper disposed along the inner periphery of the slot, and the slot is formed into two coil winding spaces. I was allowed to partition. [Selection] Figure 1

Description

  The present invention relates to an interphase insulating paper inserted into a slot of an armature. More specifically, an interphase insulating paper that insulates coil wires having different phases that are wound by a concentrated winding method on adjacent teeth forming slots of the stator core, and a stator core and a stator core in which the interphase insulating paper is inserted. The present invention relates to a coil insertion machine for inserting interphase insulating paper.

  The coil bundles wound around the adjacent teeth forming the armature so as to have different phases are in a state in which the coil bundles are adjacent to each other in the slot. Dielectric breakdown may occur. In order to prevent dielectric breakdown, interphase insulating paper that insulates adjacent coil bundles wound around the respective teeth forming a phase is disposed in the slot.

  Conventionally, dielectric breakdown is prevented by separating the coil bundles so that the coil wires do not contact each other. However, as the coil space factor of the slot increases, the possibility that coil wires having different phases come into contact with each other increases, and interphase insulating paper is arranged in the slot. After coil wires of different phases were wound in the slots, a cylindrical insulator was put on the coil wire at the end of the winding, and the adjacent coil bundles were insulated by the cylindrical insulator. However, since this work is a manual work, the technique of Patent Document 1 has been proposed as a technique for automating this work.

  The technique of Patent Document 1 aims to improve insulation reliability and productivity without damaging the coil space factor in the slot and the motor efficiency by simple means. In order to solve this problem, in Patent Document 1, a sheet-like insulating material that is continuously bent into a T-shape is provided in the slot, and a portion that extends in the vertical direction among the portions that form the T-shape. Are arranged between adjacent coil bundles in the slot. Further, the interphase insulating paper in which the portion extending in the horizontal direction among the portions forming the T-shape is arranged between each coil bundle and the corresponding end portion of the tooth portion in the slot. The technology is disclosed.

  Patent Document 1 proposes interphase insulating paper having a Ω-shape, U-shape, V-shape or the like instead of the T-shape insulation material. However, the interphase insulating paper of any shape has a bent apex portion formed on the outer side of the slot forming the stator core. Therefore, when the coil wire is displaced along the outer surface of the slot, the coil wire is There is a possibility of leakage into the adjacent phase beyond the top of the bending, and there is a possibility that dielectric breakdown may occur when the coil wire leaks.

  In Patent Document 2, it is an object to provide an electric motor that reduces dielectric breakdown between phases of a stator, and an interphase insulating resin whose cross-sectional shape is formed in a V shape is interposed, so that adjacent phases can be reliably connected. In other words, there is disclosed a technique for reducing the defect by eliminating the breakage of the film of the winding. According to the technique described in Patent Document 2, the opening angle of the V-shaped opening is appropriately determined by the amount of winding used, and is set to an extent that does not impair the spring effect.

  As a result, even when the coil space factor in the slot is small, adjacent coil wires in the slot can be reliably separated, and the V-shaped interphase insulating paper does not fall out of the slot, thereby preventing interphase insulation. The paper is said to be securely fixed. However, the interphase insulating paper described in Patent Document 2 is also the same as the case where the interphase insulating paper described in Patent Document 1 is used. There is a possibility that the coil wire leaks to the adjacent phase, and when the coil wire leaks, there is a possibility that dielectric breakdown occurs.

  In addition, when the coil space factor in the slot is large, the opening angle of the V-shaped opening is reduced by being pushed by the coil bundle, and the edge of the interphase insulating paper on the slit side on the inner surface is in close contact with the V-shaped. The shape could not be maintained, and there was a possibility that the edges of the closely spaced interphase insulating paper would be biased to one of the slits formed by adjacent teeth. If it does so, the subject that a coil wire might leak from the slit to the central cavity part of a stator core occurred.

  In Patent Document 3, an insulator that insulates the coil from the stator core is interposed between the stator coil and the stator core, and an insertion groove is formed on the outer surface side of the slot of the insulator. A technique of interphase insulating paper in which a bent portion on the outer side of the insulating paper is inserted is disclosed. However, according to this technique, although the dielectric breakdown can be surely prevented on the outer diameter side of the interphase insulating paper, the inner diameter side is only overlapped and straightened. Similar to the technique, when the coil space factor in the slot is large, there is a problem that the coil wire may leak from the slit formed by the adjacent teeth to the central cavity of the stator core.

  In Patent Document 4, two interphase insulating papers having a U-shape are stacked back to back into an I shape, or one interphase insulating paper is folded into a Z shape and the end of the interphase insulating paper is used as a stator core. A technique for inserting into a groove formed on a mounted coil winding frame is disclosed. However, when the coil space factor in the slot is high, the interphase insulating paper is used as a coil bundle, even in the case of interphase insulating paper that is back-to-back or in the case of Z-shaped interphase insulating paper. Due to the large insertion resistance due to contact, the interphase insulating paper is distorted, so that the end portion is easily detached from the groove, and there is a problem that dielectric breakdown may occur.

  In response to the recent improvement in the coil space factor in the slot, the inventor of the present application causes Patent Document 5 to simultaneously insert each coil bundle having an adjacent phase in the slot and follow the coil bundle. Thus, a technique of a coil insertion machine for inserting interphase insulating paper is disclosed. According to this technique, the interphase insulating paper is inserted following the coil bundle in a state where the insertion resistance of the interphase insulating paper is small, so that the interphase insulating paper is not easily distorted and the coil space factor in the slot is high. Even if it exists, possibility that a coil wire will leak to the division of an adjacent phase exceeding interphase insulation paper was a very low thing.

  On the other hand, after the coil wire is wound around the slot, the coil end portion after the coil winding that protrudes from the end face of the stator core is lowered in accordance with the shape of the casing of the motor. For this reason, the edge processing is performed so that the protruding height is reduced by being crushed toward the center of the stator core. When crushing the coil end portion, the coil wires arranged in the stator core flank to the side, and although it is very rare, the coil wire exceeds the interphase insulating paper and is divided into the adjacent coil bundle in the slot. There was a possibility of leakage.

JP 2004-112861 A JP 2002-112488 A Kokukai 2014-076783 JP 2009-189138 A Japanese Patent No. 5646122

  The inventor of the present application is not only when winding the coil wire, but also when processing the end portion of the coil end portion, the interphase insulating paper in which the coil wire in the slot is difficult to leak into the adjacent coil bundle section An object of the present invention is to provide a coil insertion machine for inserting the interphase insulating paper and a stator core having no insulation failure.

  A first aspect of the present invention is an interphase insulating paper which is inserted into a slot having a slit into which a coil wire is inserted inward and arranged in an annular manner in a stator core constituting an armature, the slot having an inner diameter The interphase insulating paper has a thin width having electrical insulation, and has flange portions projecting on both sides on the side, and is sandwiched between teeth arranged in an annular shape toward the axis of the stator core. The plate body is folded in half so as to form a bilaterally symmetric shape, and an inner diameter side bent portion that is bent so as to protrude sideways along the flange portion is provided at both ends of the interphase insulating paper. And an outer-diameter side bent portion that is folded and overlapped so as to protrude on both sides is provided at the center portion of the interphase insulating paper, and the inner-diameter side bent portion and the outer-diameter side bent portion are provided. Each of the parts is on the inner periphery of the slot First insulating paper in contact disposed I, it is characterized in that by partitioning the slots into two coil winding space.

  The interphase insulating paper according to the first aspect of the present invention is an interphase insulating paper for insulating two coil bundles having different phases in slots annularly arranged in a stator core forming an armature. A stator core that forms an armature has a predetermined thickness by stacking a plurality of thin metal plates. Teeth having a flange portion projecting on both sides are arranged in an annular shape toward the axial center of the stator core on the inner diameter side of the stator core. A slot between adjacent teeth is a space around which the coil wire is wound. The slits sandwiched between adjacent teeth are made as narrow as several coil wires and extend along the axis.

  The slit faces a central cavity portion having a circular cross section formed in the center portion of the stator core. A coil wire is wound around each tooth through the slit. The winding method in which the coil is inserted from the slit and the coil wire is wound around the teeth is a coil insertion in which a coil bundle in which the coil wire is bundled in advance is press-fitted by press-fitting means that slides on the inner diameter surface of the flange portion. It may be based on the method. Alternatively, a direct winding method may be employed in which a thin cylindrical body for guiding and guiding a coil wire is inserted into a slit, and the coil wire is wound around the teeth repeatedly to wind the coil wire one by one.

  A first insulating paper is previously disposed in the slot so that the stator core and the coil wire do not contact along the inner periphery thereof. On the inner diameter side of the slot, the interphase insulating paper is preferably in contact with the first insulating paper so that the interphase insulating paper is sandwiched between the first insulating paper and the coil bundle along the flange portion of the teeth. Although there is no limitation, the interphase insulating paper may be sandwiched between the first insulating paper and the flange portion.

  Each of the inner diameter side bent portion and the outer diameter side bent portion of the interphase insulating paper is arranged along the inner circumference of the slot so that the coil wires forming the coil bundles having different phases do not contact each other. The slot is divided into two coil winding spaces. Then, one sheet of interphase insulating paper is bent, and each of the inner diameter side bent portion and the outer diameter side bent portion protrudes to the side, making it difficult to bend.

  Moreover, since the inner diameter side bent portion and the outer diameter side bent portion protrude from the sides, the space between the inner diameter side and the outer diameter side of the interphase insulating paper is slightly depressed. As a result, even if the coil wires vibrate during coil winding or the coil wires compete with each other and are displaced in the slot, the coil wires stay in the recessed space and hardly leak into the adjacent phase section.

  Furthermore, when crushing the coil end portion and processing the end portion, each coil wire is compressed in the axial direction of the stator core, the coil bundle is held in the radial direction, and the coil wire is bounded between the two phases, that is, the interphase insulating paper. May be deflected in the direction. However, since the interphase insulating paper protrudes to the side and is in contact with the first insulating paper on both the inner diameter side and the outer diameter side of the interphase insulating paper, it is also bent during the end processing of the coil end portion. It is difficult for the coiled coil wire to leak into the adjacent phase section beyond the bent portion.

  According to the first invention, the interphase insulating paper is less likely to be bent, and when the coil wire is wound around the teeth, the interphase insulating paper is not easily inclined, and the coil end portion is formed after winding the teeth. Even in this case, the coil wire is less likely to leak into the adjacent phase section beyond the interphase insulating paper, and there is an advantageous effect that the insulation failure of the armature can be extremely reduced.

  According to a second aspect of the present invention, in the interphase insulating paper of the first aspect, the outer diameter side plate body of the stacked plate bodies forming the outer diameter side bent portion is curved outwardly and convexly, The outer diameter side plate is urged against and in contact with the first insulating paper.

  According to the interphase insulating paper of the second invention, the outer-diameter-side plate body of the stacked plate bodies forming the outer-diameter side bent portion is curved outwardly and convexly. The interphase insulating paper is slightly urged to contact the insulating paper with a contact width. As a result, a gap is not easily formed between the first insulating paper and the interphase insulating paper, and the coil wire is less likely to leak into the adjacent phase section.

  According to a third aspect of the present invention, in the interphase insulating paper according to the first or second aspect, an insertion guide portion when the interphase insulating paper is inserted into the slot is provided at the tip of the outer diameter side bent portion. The insertion guide portion is a chamfered portion that is formed at an end portion of the outer-diameter-side bent portion, and the outer-diameter side of the outer-diameter-side bent portion is cut off obliquely.

  Since the chamfered portion with the outer diameter side cut off obliquely is formed at the tip of the outer diameter side bent portion of the interphase insulating paper, the end of the first insulating paper is inserted when the interphase insulating paper is inserted into the slot. The chamfered portion is inserted so as to slide along the portion. According to the third invention, the interphase insulating paper is inserted so that the interphase insulating paper does not damage the first insulating paper and the interphase insulating paper itself is not damaged. Dielectric breakdown of the coil bundle forming the phase is less likely to occur.

  According to a fourth aspect of the present invention, in the interphase insulating paper according to the first or second aspect, an insertion guide portion when the interphase insulating paper is inserted into the slot is provided at the tip of the outer-diameter side bent portion. And the insertion guiding portion is formed at an end of the outer diameter side bent portion, and the outer diameter side of the outer diameter side bent portion is crushed to have a thin thickness. .

  The outer diameter side bent portion of the interphase insulating paper is thinned by crushing the outer diameter side of the outer diameter side bent portion. According to the fourth invention, when the interphase insulating paper is inserted into the slot, the end of the first insulating paper is caught on the first insulating paper, and the first insulating paper is not damaged. Since the interphase insulating paper is inserted so that the interphase insulating paper itself is not damaged, the dielectric breakdown of the coil bundles having different phases in the slot hardly occurs. In order to crush the outer diameter side of the outer diameter side bent part to make it thinner, the interphase insulation paper is folded and then inserted into the drawing mold part that forms the interphase insulating paper into a predetermined shape. What is necessary is just to heat-compress the edge part of paper.

  A fifth aspect of the present invention is a wound stator core, wherein a coil bundle having different phases in one slot is partitioned by the interphase insulating paper according to the first to fourth aspects. It is said. According to the fifth aspect of the present invention, the coil core having different phases is not leaked to the adjacent section both when the coil is inserted and when the coil end portion is molded. There is an advantageous effect of being.

  6th invention of this invention is a coil insertion machine, Comprising: The interphase insulating paper guide shaft body which has the interphase insulating paper guide hole which guides the interphase insulating paper of the 1st to 4th invention is provided, The said interphase insulating paper The guide hole includes a pusher shaft body passage hole through which an interphase insulating paper pusher shaft body that pushes out interphase insulating paper passes in the center, and the outer diameter side bent portion can pass through the outer portion, An outer diameter side bent portion passage hole having a width wider than that of the outer diameter side bent portion is included.

  In addition to the conventional interphase insulating paper pusher shaft passage hole, the interphase insulating paper guide shaft body has an outer diameter having a predetermined width on the side so that the outer diameter side bent portion passes. A side bent portion passage hole is formed. The outer diameter side bent portion passage hole may be cut so as to cross the interphase insulating paper passage hole by inserting a wire saw into the interphase insulating paper passage hole.

  According to the sixth invention, it is possible to insert not only the conventional interphase insulating paper having a substantially T-shape but also the interphase insulating paper having the shape of the first to fourth inventions of the present invention into the slot, Even with a single coil insertion machine, interphase insulating papers having a plurality of shapes can be inserted into the stator core, and there is an unprecedented advantageous effect that the versatility of the coil insertion machine is enhanced.

  7th invention of this invention is a coil insertion machine of 6th invention, Comprising: The hollow part is formed along the axial direction in the outer diameter side center part of the said outer diameter side bending part passage hole. It is characterized by that. According to the seventh aspect of the present invention, the hollow portion is formed along the axial direction at the outer diameter side central portion of the outer diameter side bent portion passage hole formed in the interphase insulating paper guide shaft body. Even if the outer-diameter-side plate body of the overlapped plate bodies forming the radial-side bent portion is curved outwardly in a convex shape, the outer-surface-side plate body is replaced by the first surface without being crushed. The insulating paper can be inserted into the slot while maintaining the function of biasing the insulating paper. According to the seventh aspect of the invention, it is possible to provide a coil insertion machine capable of inserting interphase insulating paper without deforming the outer-diameter-side plate that is curved outwardly.

-According to the first aspect of the present invention, the interphase insulating paper is not easily bent, and the interphase insulating paper is not easily tilted when the coil wire is wound around the teeth. Even when the portion is molded, the coil wire is less likely to leak into the adjacent phase section beyond the interphase insulating paper, and there is an advantageous effect that the insulation failure of the armature can be extremely reduced.
According to the second aspect of the present invention, there is no gap between the first insulating paper and the interphase insulating paper, and the coil wire is less likely to leak into the adjacent phase section.
-According to the third invention of the present invention, the interphase insulating paper is inserted so that the interphase insulating paper does not damage the first insulating paper and the interphase insulating paper itself is not damaged. Dielectric breakdown of coil bundles having different phases in the slot is less likely to occur.

According to the fourth aspect of the present invention, when the interphase insulating paper is inserted into the slot, the end portion of the first insulating paper is caught by the first insulating paper, and the first insulating paper is damaged. In addition, since the interphase insulating paper is inserted so that the interphase insulating paper itself is not damaged, the dielectric breakdown of the coil bundles having different phases in the slot hardly occurs.
-According to the fifth aspect of the present invention, the coil bundles having different phases are not leaked to the adjacent section when the coil is inserted and when the coil end portion is formed, and the insulation is poor. There is an advantageous effect that it is a stator core having no gap.
-According to the sixth invention of the present invention, even with a single coil insertion machine, a plurality of shapes of interphase insulating paper can be inserted into the stator core, and the conventional versatility of the coil insertion machine is enhanced. There is no advantageous effect.
-According to the seventh aspect of the present invention, it is possible to provide a coil insertion machine capable of inserting interphase insulating paper without deforming the outer-diameter-side plate curved in an outward convex shape. It is.

Explanatory drawing of phase insulation paper (Example 1). Explanatory drawing explaining insertion of the interphase insulation paper to a slot (Example 1). (Example 1) explaining the interphase insulation paper guide member. Explanatory drawing of a coil insertion machine (Example 1). Explanatory drawing explaining the manufacturing process of phase insulation paper (Example 1). Explanatory drawing explaining the manufacturing process of phase insulation paper (Example 1). Explanatory drawing explaining the manufacturing process of phase insulation paper (Example 1). Explanatory drawing of the edge part process of a coil end part (Example 1). Explanatory drawing of phase insulation paper (Example 2).

  Not only when winding the coil, but also when processing the end of the coil end, the outer diameter side should not be leaked to the section of the adjacent coil wire beyond the phase in one slot. The outer-diameter-side bent portion is overfolded, the inner-diameter-side bent portion is formed on the inner-diameter side, and the bent portion is formed so as to protrude on both the inner-diameter side and the outer-diameter side. Interphase insulating paper. In addition, the bent portions are in contact with the first insulating paper that is fitted in the slot holes in advance. Furthermore, an armature having the interphase insulating paper inserted therein and a coil insertion machine for inserting the interphase insulating paper are provided.

  In Example 1, the interphase insulating paper 1 and the interphase insulating paper 1 in which the outer surface side plate body 13 of the overlapping plate bodies forming the outer diameter side bent portion 12 is curved so that the cross section is convex are formed. The mounted stator core and the coil insertion machine 200 will be described with reference to FIGS. FIG. 1A shows a perspective view of the interphase insulating paper 1, and FIG. 1B shows a cross-sectional view of the interphase insulating paper 1. FIG. 2 is an explanatory view for explaining the insertion of the interphase insulating paper 1 into the slot 71 of the stator core 70.

  3A shows a cross-sectional view of the interphase insulating paper guide member 90. Each of FIGS. 3B and 3C shows the slot 71, the interphase insulating paper guide member 90, and the interphase insulating paper. It is a figure explaining the position with 1. FIG. Each of FIGS. 3B and 3C shows a partially cutaway sectional view looking up at the position A in FIG. FIG. 3B shows the case where the interphase insulating paper 1 of the present invention is inserted, and FIG. 3C shows the case where the conventional T-shaped interphase insulating paper 3 is inserted. FIG. 4 is a perspective view illustrating the upper tool 100 of the coil insertion machine. 5 to 7 are explanatory views for explaining the manufacturing process of the interphase insulating paper 1. FIG. 8 is an explanatory diagram for explaining end processing of the coil end portion 77.

  The interphase insulating paper 1 has such a length that the end portion 20 protrudes beyond the end faces 72 on both sides of the stator core (see FIGS. 2, 4, and 8). The interphase insulating paper 1 is formed by being folded in two so that the plate 10 having electrical insulation is symmetrical. Both end portions of the interphase insulating paper 1 are provided with an inner diameter side bent portion 11 that is bent so as to protrude sideways along the teeth flange portion 73 (see FIGS. 2 and 3). In addition, an outer-diameter side bent portion 12 is provided at the center portion of the interphase insulating paper 1 so as to protrude to both sides and is bent (see FIG. 1B).

  The plate body 13 on the outer surface side of the outer-diameter side bent portion 12 (see FIG. 1 (A)) has the central portion of the plate body 10 curved outwardly so that its cross section is convex. Yes. Due to the urging force generated by curving the plate body 10 in a convex manner, the curved central surface 14 is urged and brought into contact with the first insulating paper 80 (see FIG. 2) previously fitted in the slot. In addition, there is no gap between the first insulating paper 80 and the outer plate 13. The folding width 15 of the outer diameter side bent portion is wider than the intermediate portion 18 of the overlapping plate body between the inner diameter side bent portion 11 and the outer diameter side bent portion 12, and is larger than the width of the interphase insulating paper guide member 90. It is only necessary to be small and protrude to the space side of the coil bundle (see FIG. 1B).

  At both ends of the interphase insulating paper 1, an inner diameter side bent portion 11 is formed along the flange portion 73 of the tooth (see FIG. 3B). Each inner diameter side bent portion 11 may have a width smaller than the width of the inner surface of the flange portion 73 of each tooth 74 and wider than the width of the slit 75 between adjacent teeth. The dimension of the gap 19 (see FIG. 1A) between the left and right plates in the intermediate portion 18 of the overlapped plate is not limited. If the coil space factor of the slot 71 is high, the slot 71 is in a close contact state. If the space factor is low, it can be left open.

  The tip of the interphase insulating paper 1 which is the side inserted into the slot is a chamfered portion 16 whose outer diameter side is cut off obliquely (see FIG. 1A). A state in which the interphase insulating paper 1 is inserted into the slot 71 will be described with reference to the perspective view shown in FIG. In FIG. 2, for easy understanding, the coil wire is not shown, the outline of the inner diameter of the slot 71 and the visible / hidden portion of the interphase insulating paper 1 are indicated by broken lines, and the interphase insulating paper is inserted into only one slot. It shows the state before and after.

  The interphase insulating paper 1 is supported by a lower end portion 21 by an interphase insulating paper pusher shaft 91 having a V-shaped leading end so that it does not come off from the front end of the interphase insulating paper pusher shaft. 2 is guided in the direction of the arrow shown in FIG. 2 through the interphase insulating paper guide hole 92 penetrating the paper guide member 90 (see FIG. 3A), and is wound in one slot 71. It is inserted between the two coil bundles 76 and 76 so as to penetrate the slot (see FIG. 4).

  The interphase insulating paper 1 has a chamfered portion on a collar portion 81 (see the collar portion at the upper end portion shown in FIG. 2) at the lower end portion of the first insulating paper 80 that is fitted in the slot of the stator core 70 in advance. 16 begins to be inserted into the slot 71 so as to contact, and the chamfered portion is inserted into the lower end portion of the first insulating paper 80 so as to slide. Further, at the stage where the central convex portion 17 is in contact with the first insulating paper 80, the central convex portion 17 is slightly flattened and a gap between the left and right plate bodies in the intermediate portion 18 of the overlapping plate bodies is obtained. Is slightly opened and is smoothly inserted between the two coil bundles 76 (see FIGS. 2 and 4). Due to the restoring force that the convex portion 17 and the intermediate portion 18 restore to the original shape, an urging force that the convex portion 17 comes into contact with the first interphase insulating paper 80 is generated.

  Here, the interphase insulating paper guide member 90 will be described with reference to FIGS. 3 and 4. The interphase insulating paper guide member has an axial forward end 93 formed in a mountain shape and has a shape that does not interfere with the coil bundle 76 when the coil is inserted (see FIG. 4). The inner diameter side 94 of the interphase insulating paper guide member is also formed in a shape with a narrowed tip, and does not interfere with the coil bundle (see FIG. 3A). A through-hole is formed in the interphase insulating paper guide member 90 from the inner diameter side to the center so as to guide the outer diameter side portion of the interphase insulating paper 1 so as to be an interphase insulating paper guide hole 92. .

  At the center of the interphase insulating paper guide hole 92, a pusher shaft body passage hole 95 is formed in which the interphase insulating paper pusher shaft body 91 can slide. Further, an intermediate gap 96 having a slightly wider width than the intermediate portion 18 of the overlapped plate is formed on the outer diameter side of the pusher shaft passage hole 95, and the outer diameter side bent portion 12 is formed on the outer diameter side. An outer diameter side bent portion passage hole 97 having a wider width is formed. The outer diameter side bent portion passage hole 97 is a hole having a depth greater than the thickness of the outer diameter side bent portion 12, and a hollow portion 98 is formed along the axial direction in the outer diameter side central portion of the hole. (See FIG. 3A).

  The convex part 17 formed in the plate on the outer surface side is guided by the hollow part 98, and the interphase insulating paper 1 is inserted into the slot 71 so that the convex part 17 is not crushed (see FIG. 3B). . Further, since the intermediate gap 96 is a gap having a width slightly wider than the intermediate portion 18 of the overlapped plate, when the conventional T-shaped interphase insulating paper 3 is inserted, the bent intermediate portion 18 is sandwiched between the intermediate gaps 96 and guided so as not to tilt left and right in the slot, and is inserted between the two coil bundles in the slot. The interphase insulating paper guide member 90 can be inserted so as not to be distorted even if it is the conventional T-shaped interphase insulating paper 3 (see FIG. 3C).

  FIG. 4 shows a coil insertion mechanism called the upper tool 100. The upper tool 100 is included in a coil insertion machine (see FIG. 7) and is a mechanism for inserting a coil bundle into the stator core 70. In FIG. 4, a coil bundle 76 hooked on a blade shaft 99 constituting a coil insertion machine is press-fitted by a press-fitting means called a stripper 201 (see FIG. 7 (H)), and the interphase insulating paper 1 is followed. The inserted state is shown. Needless to say, the drive means of the coil insertion mechanism omitted in FIG. 4 may be a known drive means. In FIG. 4, the visible / hidden portion of the interphase insulating paper 1 inserted in the stator core in the front row in the figure is indicated by a broken line, and the interphase insulating paper pusher shaft 91 is indicated by a one-dot chain line. In the state where the interphase insulating paper 1 is completely inserted, the protruding lengths of the interphase insulating paper protruding from the end faces 72, 72 on both sides of the stator core are the same.

  Here, with reference to FIG. 4, the upper tool 100 is demonstrated easily. In the upper tool 100, a blade shaft body 99 is annularly arranged, and a coil bundle 76 wound in advance is hooked on the blade shaft body 99. From the gap between the adjacent blade shaft body 99 and the blade shaft body 99, The coil bundle is drawn out of the upper tool (see FIG. 7H). The interphase insulating paper guide shafts 90 are annularly arranged so that the interphase insulating paper guide holes 92 face the gap. A stripper 201 (see FIG. 7 (H)) is slid along the inner surface of the blade shaft body arranged in an annular shape from the bottom toward the top in the central space of the stator core 70 and hooked on the blade shaft 99. The coil bundle thus formed is inserted so as to be pushed into the slot from the slit 75 (see FIG. 3B) of the stator core.

  Next, the manufacturing process of the interphase insulating paper 1 will be described with reference to FIGS. The interphase insulating paper 1 is a step of making a crease in a long resin sheet 30 (see FIG. 5A), a step of cutting the plate 10 that forms the interphase insulating paper (see FIG. 5B), an interphase Step of folding insulating paper 1 (see FIG. 5C), step of storing one interphase insulating paper 1 in storage 43 (see FIG. 6D), one interphase insulating paper 1 being predetermined (See FIG. 6E), a step of storing all interphase insulating paper 1 in the wedge magazine 60 (see FIG. 6F), and moving the wedge magazine 60 to the coil insertion position. It consists of a process (FIG. 7G). Note that FIG. 6E shows a cross-sectional shape on the inlet side of the drawing die portion.

  FIG. 7H shows a state in which the interphase insulating paper 1 is stored in the interphase insulating paper storage unit 61 on the right side from the center portion (dashed line) in the drawing, and the coil bundle 76 is shown on the left side from the central portion in the drawing. And the state in which the interphase insulating paper 1 is inserted are shown in contrast. In the coil insertion machine 200, the wedge magazine 60 storing all the interphase insulating paper 1 is rotated and moved to the coil insertion position on the work turntable 202, and the coil bundle is hooked on the blade shaft 99. The stripper 201 driven by the stripper sliding means 203 is pushed up from below the tool 100, and the interphase insulating paper pusher shaft 91 extends upward to follow the coil bundle 76 so that the interphase insulating paper 1 is placed in the slot. It is inserted (see broken line arrow in FIG. 7 (H)).

  In the interphase insulating paper 1, first, a long resin sheet 30 is sandwiched between opposed crease forming molds in which a mountain-shaped line is formed on one side and a valley-shaped line is formed on the other side. In the figure, a mountain fold signature 31 indicated by a broken line and a valley fold signature 32 indicated by a one-dot chain line are formed. Next, the V-shaped part is cut out at a position that forms the front part of the outer-diameter side bent part so that a slope 33 that forms a chamfered part is formed, and is cut to a predetermined length. It is cut into a plate 10 that forms interphase insulating paper (FIG. 5B).

  Next, while the portion 22 forming the intermediate portion of the overlapped plate body is pushed into the folding mold 40 having a recessed central portion, the portion that becomes the inner diameter side bent portion 11 is opened to both sides. Then, the interphase insulating paper 1 is bent so as to form a substantially U shape (see FIG. 5C). Next, the male jig 41 having a thin plate 42 is inserted and pushed into the open side 23 of the central portion of the interphase insulating paper having a substantially U shape, thereby opening the female container. The interphase insulating paper 1 is stored in the storage 43 from the side 44.

  The opening width of the open side 44 of the housing is narrower than the outer dimensions of the left and right inner diameter side bent portions 11 of the interphase insulating paper 1, and the inner diameter side bent portion 11 of the pushed interphase insulating paper is outward. (FIG. 6D)). In the housing 43, the slit widening portion 46 is provided so that the pusher shaft body 62 (see FIG. 7B) is guided to the substantially central portion of the slit 45 in which the intermediate portion 18 of the overlapped plate body is stored. Is formed.

  The interphase insulating paper 1 having a substantially U shape stored in the storage unit 43 is shaped so as to be a plate body on which the outer-diameter side bent portion 12 is overlapped when guided in the drawing die 50. It is arranged. Specifically, the entrance side 51 of the interphase insulating paper of the drawing die portion has the same shape as the closed side of the enclosure 43 (FIG. 6E), and the exit side is the interphase insulating paper of the wedge magazine. It has the same shape as the storage portion 61 (FIG. 6F).

  From the center to the right side of the side view of the coil insertion machine 200 shown in FIG. 7 (H), the step of storing the interphase insulating paper 1 in the storage 43 (see arrow A) and the interphase insulating paper 1 are shaped. The process (see arrow B) is shown. The interphase insulating paper 1 stored in the container 43 is pushed up by the pusher shaft body 62 and guided through the drawing die 50, and the gap 19 between the left and right plate bodies and the outer diameter side folding at the intermediate portion 18 of the interphase insulating paper. The bend 12 is stored in the interphase insulating paper storage 61 of the wedge magazine 60 while being narrowed (see FIG. 6F).

  In FIG. 7 (H), the interphase insulating paper 1 is stored one by one in the interphase insulating paper storage section 61 of the wedge magazine, and the wedge magazine 60 is shown in FIG. 6 (F) by arrows A and FIG. 7 (G). (Refer to the arrow) The inter-phase insulating paper is rotated by an arrangement angle corresponding to one inter-phase insulating paper, and the inter-phase insulating paper is sequentially stored in all the inter-phase insulating paper storage units 61. Next, the entire wedge magazine 60 is rotated with respect to the central axis of the turntable 202 (see the arrow B in FIG. 7G) and moved to the coil insertion position. At the coil insertion position, the stripper 201 and the interphase insulating paper pusher shaft 91 are extended from below the upper tool 100 in a state where the coil bundle 76 is hooked on the blade shaft 99, and follow the coil bundle 76. Thus, the interphase insulating paper 1 is inserted into the slot (see the broken line arrow in FIG. 7H).

  Here, end processing of the coil end portion 77 will be briefly described with reference to FIG. Each of FIGS. 8A and 8B is a cross-sectional view in which only two slots are cut in a direction along the circumferential direction. For ease of understanding, the entire coil bundle is shown for the central slot, and only the outer edge of the coil bundle is shown by broken lines for the slots on both sides.

  Immediately after the coil is inserted by the coil insertion machine, the coil end portion 77 of the coil bundle is in a state extending vertically from the end face of the stator core (see FIG. 8A). This is applied in the direction of the arrow shown in FIG. 8 (A), and as shown in FIG. 8 (B), end processing is performed so as to crush the coil end portion 77, and the length is small. It is stored in the casing of the electric motor.

  When the coil end portion 77 is crushed, each coil wire 78 in the slot is also applied in the vertical direction, so that the coil wire having a gap on the side is bent sideways. However, when the interphase insulating paper 1 of the present invention is inserted, even if there is a coil wire bent sideways, the outer diameter side bent portion 12 is provided on the outer diameter side, and the inner diameter side is provided. Is provided with an inner diameter side bent portion 11, and each bent portion is in contact with the first insulating paper 80 with a width (see FIG. 3B), so that the bent coil wire is adjacent. It is difficult to leak into the phase section 79.

  In Example 2, the interphase insulating paper 2 in which the convex shape of the outer-diameter side plate 24 on the front side of the outer-diameter side bent portion is crushed and the insertion guide portion 25 is made thin is shown in FIG. A brief description will be given with reference. When the interphase insulating paper 2 is folded in the folding mold, only the tip is heated and compressed in the thickness direction and crushed to form an insertion guide portion 25 having a thin plate thickness. Since the insertion guide portion 25 has a thin plate thickness, when the interphase insulating paper 2 is inserted, the leading end portion 26 of the interphase insulating paper is inserted smoothly without being caught by the first insulating paper.

  Further, since only the insertion guide portion 25 is heated and compressed, the substantially entire length of the outer-diameter side bent portion 12 remains in an outwardly convex state, and the first insulating paper 80 and the interphase insulation The paper 2 is kept in contact with the urging force so that there is no gap. This makes it very difficult for the coil wire to leak into the adjacent phase section during coil insertion and coil end processing.

(Other)
In each of the two embodiments, the interphase insulating paper provided with the insertion guiding portion at the front of the interphase insulating paper is shown, but it goes without saying that the insertion guiding portion may not be provided.
In the embodiment, the interphase insulating paper has been described by the coil wire winding method by the coil insertion method, but the coil wire winding method is not limited, and the interphase insulating paper of the present invention is of course applied. That is.
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The technical scope of the present invention is shown not by the above description but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

1, 2 ... interphase insulating paper, 3 ... conventional T-shaped interphase insulating paper, 100 ... upper tool, 200 ... coil insertion machine,
DESCRIPTION OF SYMBOLS 10 ... Plate body, 11 ... Inner diameter side bending part, 12 ... Outer diameter side bending part, 13 ... Outer surface side plate body, 14 ... Center surface, 15 ... Folding width, 16 ... Chamfering part, 17 ... Convex part, DESCRIPTION OF SYMBOLS 18 ... Intermediate part, 19 ... Gap, 20 ... End part, 21 ... Lower end part, 22 ... Part which forms intermediate part, 23 ... Opening side, 24 ... Plate body of outer diameter side, 25 ... Insertion guide part, 26 ... the front part,
30 ... Resin sheet, 31 ... Mountain fold signature, 32 ... Valley fold signature, 33 ... Inclination forming chamfer,
40 ... Folding type, 41 ... Male jig, 42 ... Thin plate, 43 ... Storage, 44 ... Open side of the storage, 45 ... Slit, 46 ... Slit widening part,
50 ... Drawing part, 51 ... Entrance side,
60 ... wedge magazine, 61 ... interphase insulating paper storage, 62 ... pusher shaft,
70 ... Stator core, 71 ... Slot, 72 ... End face, 73 ... Flange part, 74 ... Teeth, 75 ... Slit, 76 ... Coil bundle, 77 ... Coil end part, 78 ... Coil wire, 79 ... Next phase section,
80 ... first insulating paper, 81 ... collar, 82 ... lower end,
90 ... Interphase insulating paper guide member, 91 ... Interphase insulating paper pusher shaft, 92 ... Interphase insulating paper guide hole, 93 ... Axial direction, 94 ... Inner diameter side, 95 ... Pusher shaft body passage hole, 96 ... Intermediate gap, 97 ... outer-diameter side bent part passage hole, 98 ... hollow part, 99 ... blade shaft body,
201 ... stripper, 202 ... turntable, 203 ... stripper sliding means

Claims (7)

An interphase insulating paper inserted into a slot having a slit into which a coil wire is inserted inward and arranged in an annular shape on a stator core that forms an armature,
The slot has flange portions protruding on both sides on the inner diameter side, and is formed by being sandwiched between teeth arranged annularly toward the axis of the stator core,
The interphase insulating paper is folded in half so that one sheet of thin plate having electrical insulation has a symmetrical shape,
Both end portions of the interphase insulating paper are provided with inner side bent portions that are bent so as to protrude sideways along the flange portion,
The center portion of the interphase insulating paper is provided with an outer-diameter side bent portion that is folded and overlapped so as to protrude on both sides,
Each of the inner diameter side bent portion and the outer diameter side bent portion is in contact with a first insulating paper disposed along the inner periphery of the slot, and the slot is divided into two coil winding spaces. ing,
Interphase insulating paper characterized by that. The outer diameter side plate body of the stacked plate bodies forming the outer diameter side bent portion is curved outwardly convexly,
The outer diameter side plate is urged against and in contact with the first insulating paper,
The interphase insulating paper according to claim 1. At the tip of the outer diameter side bent portion, an insertion guiding portion is provided when the interphase insulating paper is inserted into the slot,
The insertion guiding portion is a chamfered portion formed at an end portion of the outer diameter side bent portion, and an outer diameter side of the outer diameter side bent portion is obliquely cut off.
The interphase insulating paper according to claim 1 or 2, characterized by the above. At the tip of the outer diameter side bent portion, an insertion guiding portion is provided when the interphase insulating paper is inserted into the slot,
The insertion guiding portion is formed at an end of the outer diameter side bent portion, and the outer diameter side of the outer diameter side bent portion is crushed to a thin thickness.
The interphase insulating paper according to claim 1 or 2, characterized by the above. A wound stator core,
The interphase insulating paper according to any one of claims 1 to 4, wherein a coil bundle having different phases in one slot is partitioned.
A wound stator core characterized in that. A coil insertion machine,
An interphase insulating paper guide shaft having an interphase insulating paper guide hole for guiding the interphase insulating paper according to any one of claims 1 to 4,
The interphase insulating paper guide hole includes a pusher shaft body passage hole through which an interphase insulating paper pusher shaft body that pushes out interphase insulating paper passes in the center, and the outer diameter side bent portion can pass through an outer portion. An outer diameter side bent portion passage hole having a wider width than the outer diameter side bent portion,
A coil insertion machine characterized by that. In the outer diameter side central portion of the outer diameter side bent portion passage hole, a recess is formed along the axial direction.
The coil insertion machine according to claim 6.

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