JP5359463B2 - Stator and rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil wire, a stator, and a rotary electric machine, wherein it is possible to enhance the space factor of a coil wire and reduce the eddy current loss. <P>SOLUTION: A coil 190 is attached to a stator core with multiple slots formed therein and is formed of a large number of element wires 200 that are coil wires extended so as to pass through the slots and arrested by one another. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a coil wire, a stator, and a rotating electric machine, and more particularly to a coil wire formed from a plurality of strands, a stator provided with the coil wire, and a rotating electric machine.

  Various coil wires, stators, and rotating electric machines have been proposed in the past, and in particular, in recent years, coil wires for improving the space factor of the coil wires in the slots, and stators and rotating electric machines having the coil wires have been proposed. Has been.

  For example, a stator described in Japanese Patent Application Laid-Open No. 2009-11148 and Japanese Patent Application Laid-Open No. 2009-11152 includes a stator core formed with a plurality of slots in the circumferential direction, and a stator formed of a wire having a substantially rectangular cross section. And windings.

  A stator described in JP 2009-17632 A includes a stator core and a stator coil formed in a continuous wave winding shape. The stator coil has a rectangular cross section.

JP 2009-11148 A JP 2009-111152 A JP 2009-17632 A

  In the above conventional stator, a stator winding having a rectangular cross section is employed. Each stator winding extends across a plurality of slots. Each stator winding is composed of one strand. The circumferential width of the stator winding is slightly smaller than the circumferential width of the slot.

  Here, when a magnetic flux that penetrates the stator winding is generated from the outside of the stator winding, an eddy current is generated in the stator winding, and an eddy current loss occurs.

  The present invention has been made in view of the problems as described above, and its purpose is to improve the space factor of the coil wire and reduce the eddy current loss, the stator, and It is to provide a rotating electrical machine.

  The coil wire which concerns on this invention is a coil wire provided in the stator core of a rotary electric machine, Comprising: At least one part is formed with the some strand restrained mutually.

  Preferably, a plurality of restraining portions that restrain the strands are further provided, and the restraining portions are provided at intervals in the extending direction of the strands.

  Preferably, the cross-sectional shape of the strand in a direction perpendicular to the extending direction of the strand is a hexagonal shape.

  A stator according to the present invention includes a stator core having a plurality of slots formed in an annular shape and the coil wire. Preferably, the coil wire is drawn out from the slot onto an end surface arranged in the direction of the center line of the stator core. Then, the number of wires arranged in the slot in the radial direction is made different from the number of wires arranged in the radial direction on the end face of the stator core.

  Preferably, a plurality of the coil wires are arranged in the radial direction of the stator core in the slot. Preferably, a plurality of the strands are arranged in the slot in the radial direction of the stator core, and the length of the coil wire in the radial direction of the stator core is longer than the circumferential length of the stator core in the slot. Is done. A plurality of the wires are arranged in the central axis direction of the stator core on the end surface of the stator core, and the length of the coil wire in the central axis direction of the stator core is larger than the length in the radial direction of the stator core on the end surface of the stator core. Long formed.

  Preferably, in the slot, the circumferential width of the stator core of the strand is formed to be smaller than half of the circumferential width of the slot.

  Preferably, the coil wire includes an insertion portion inserted into the slot, a drawing portion drawn on the end face of the stator core, and a connection portion connecting the insertion portion and the drawing portion. An insertion portion restraining portion that restrains the strands positioned in the portion, and a leading portion restraining portion that restrains the strands located in the leading portion. And the said connection part is exposed outside from the restraint part for insertion parts, and the drawer | drawing-part restraint part.

  In another aspect, the stator according to the present invention includes a stator core formed in an annular shape and having a plurality of slots formed on the inner peripheral surface thereof, and a coil wire inserted into the slot. The coil wire includes a first coil wire to which first phase power is supplied and a second coil wire to which second phase power is supplied. Further, the slot is formed with a first slot into which the first coil wire is inserted, a second slot into which the second coil wire is inserted, and spaced apart from the first slot in the circumferential direction. A third slot located opposite to the first slot with respect to the two slots and a fourth slot located opposite to the second slot with respect to the third slot are included. Further, the first coil includes a first insertion part inserted into the first slot, a first extraction part drawn out to an end surface of the stator core, and a third insertion part inserted into the third slot. The second coil includes a second insertion part inserted into the second slot, a second extraction part drawn out to the end face of the stator core, and a fourth insertion part inserted into the fourth slot, The one extraction portion extends in the circumferential direction of the stator core, and is provided so as to pass through a position adjacent to the radial direction of the stator core from the second extraction portion. A rotating electrical machine according to the present invention includes the stator.

  According to the coil wire, the stator, and the rotating electrical machine according to the present invention, the space factor when mounted on the stator core can be improved and the eddy current loss can be reduced.

It is sectional drawing of the rotary electric machine 100 which concerns on Embodiment 1 of this invention. 3 is a perspective view of a stator 140. FIG. It is a top view when the stator 140 is planarly viewed from the rotation center axis O direction. FIG. 4 is a development view of an inner peripheral surface of a stator 140. FIG. 6 is a development view of an end surface 142 of a stator core 141. FIG. 4 is a schematic diagram showing an insertion state of each coil wire in a slot 172. FIG. 6 is a development view of an end surface 143 of a stator core 141. FIG. 6 is a cross-sectional view of first U-phase coil 190 extending on end surface 142. 4 is a cross-sectional view of first U-phase coil 190 in slot 172. FIG. It is sectional drawing which shows the modification of a coil. It is sectional drawing which shows the modification of a coil. 3 is a perspective view showing a part of first U-phase coil 190 and second U-phase coil 191. FIG. 3 is a perspective view showing a part of a first U-phase coil 190 in detail. FIG. It is a schematic diagram which shows typically the winding state of a coil. It is a perspective view which shows the 1st process of the manufacturing process of a coil. It is sectional drawing which shows the cross section of each strand. It is a perspective view which shows the 2nd process of the manufacturing process of a coil. It is a perspective view which shows the manufacturing process of a stator. It is a perspective view which shows the process of manufacturing another coil. It is sectional drawing of the strand which manufactures another coil.

  A coil wire, a stator, and a rotating electrical machine according to the present invention will be described with reference to FIGS.

  Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified. In addition, when there are a plurality of embodiments below, it is planned from the beginning to appropriately combine the features of each embodiment unless otherwise specified.

  FIG. 1 is a cross-sectional view of rotating electric machine 100 according to Embodiment 1 of the present invention. As shown in FIG. 1, the rotating electrical machine 100 surrounds a rotating shaft 110 provided to be rotatable about a rotation center axis O, a rotor 120 fixed to the rotating shaft 110, and an outer periphery of the rotor 120. And an annular stator 140.

  The rotor 120 is provided on a rotor core 125 formed by laminating a plurality of electromagnetic steel plates, a plurality of permanent magnets 123 inserted into magnet insertion holes 126 formed in the rotor core 125, and an end surface of the rotor core 125. And an end plate 122. The permanent magnet 123 is fixed by a resin 124 filled in the magnet insertion hole 126.

  The stator 140 includes a stator core 141 formed in an annular shape around the rotation center axis O, and a U-phase coil 181, a V-phase coil 182, and a W-phase coil 183 attached to the stator core 141.

  The stator core 141 includes a split stator core arranged in an annular shape and an annular fixing member provided on the outer periphery of the split stator core. Each divided stator core includes a divided yoke portion extending in the circumferential direction and a stator tooth 171 formed so as to protrude from the divided yoke portion. An annular yoke portion 170 is formed by arranging a plurality of divided stator cores in an annular shape, and each stator tooth 171 is disposed so as to protrude in the radial direction from the inner peripheral surface of the yoke portion 170.

  FIG. 2 is a perspective view of the stator 140, and FIG. 3 is a plan view of the stator 140 viewed in plan from the direction of the rotation center axis O.

  As shown in FIGS. 2 and 3, a plurality of stator teeth 171 are formed on the stator core 141 at intervals, and a plurality of slots are formed on the inner peripheral surface of the stator core 141 at intervals in the circumferential direction. 172 is formed.

  U-phase coil 181 extends over a plurality of slots 172, and V-phase coil 182 and W-phase coil 183 also extend over a plurality of slots 172. The coil of stator 140 according to the present embodiment is wave wound.

  FIG. 4 is a development view of the inner peripheral surface of the stator 140, and FIG. 5 is a development view of the end surface 142 of the stator core 141. FIG. 6 is a schematic diagram showing an insertion state of each coil wire in the slot 172. FIG. 7 is a development view of the end surface 143 of the stator core 141.

  Here, as shown in FIG. 4, U-phase coil 181 includes first U-phase coil 190 and second U-phase coil 191 inserted in a slot adjacent to the slot in which first U-phase coil 190 is inserted. ing. V-phase coil 182 further includes a first V-phase coil 192 and a second V-phase coil 193 inserted in a slot adjacent to the slot in which first V-phase coil 192 is inserted. W-phase coil 183 includes a first W-phase coil 194 and a second W-phase coil 195 inserted in a slot adjacent to the slot in which the first W-phase coil 194 is inserted.

  Here, first U-phase coil 190 extends to pass through a plurality of slots 172. Specifically, first U-phase coil 190 passes through one slot 172, and then is drawn from slot 172 onto end surfaces 142 and 143. The first U-phase coil 190 extends on the end surfaces 142 and 143 in the circumferential direction and is inserted into another slot 172. The first U-phase coil 190 is connected to the second U-phase coil 191 after being routed in this way. The second U-phase coil 191 is also routed similarly to the first U-phase coil 190. Thus, the U-phase coil 181 extends so as to go around the stator core 141 twice.

  Further, the first V-phase coil 192 and the second V-phase coil 193 are similarly routed, and one end of the first V-phase coil 192 is connected to one end of the second V-phase coil 193. Thereby, the V-phase coil 182 is routed around the stator core 141 twice.

  Similarly, first W-phase coil 194 and second W-phase coil 195 are similarly routed, one end of first W-phase coil 194 is connected to the end of second W-phase coil 195, and W-phase coil 183 is connected to stator core 141. It is drawn around to make two laps.

  Each U-phase coil 181, V-phase coil 182 and W-phase coil 183 are composed of a plurality of strands constrained to each other and a restraining portion for restraining each strand.

  Thereby, the coil wire which comprises each coil is divided | segmented into plurality by the width direction of a coil wire, and there is no continuous area | region which a big eddy current produces on the surrounding surface of each coil wire. For this reason, even if the magnetic flux enters the coil wire from the outside, it is possible to suppress the generation of a large eddy current in the coil wire, and to reduce the eddy current loss.

  When the rotor 120 rotates at a high speed, a large amount of leakage magnetic flux passes through the coil wire. On the other hand, according to the coil wire according to the present embodiment, generation of a large eddy current loss can be suppressed.

  FIG. 8 is a cross-sectional view of first U-phase coil 190 extending on end surface 142, and in particular, a cross-sectional view in a cross section perpendicular to the extending direction of first U-phase coil 190.

  As shown in FIG. 8, the first U-phase coil 190 includes a plurality of strands 200 and a restraining portion 201 that fixes the plurality of strands 200 to each other.

  Each strand 200 includes a conductive wire 230 such as a copper wire and an insulating film 231 that covers the outer peripheral surface of the conductive wire 230. And the restraint part 201 is formed from the self-bonding material (self-bonding line) etc. which have insulation.

  In the example shown in FIG. 8, a plurality of the strands 200 are arranged in the direction of the rotation center axis O of the stator core 141. In other words, of the outer peripheral surface of the first U-phase coil 190, the side surface arranged in the radial direction of the stator core 141 is divided into a plurality of portions in the direction of the rotation center axis O. For this reason, even if the magnetic flux enters the first U-phase coil 190 from this side surface, a large eddy current is difficult to occur.

  Further, in the example shown in FIG. 8, a plurality of the strands 200 are arranged in the radial direction of the stator core 141. For this reason, of the outer peripheral surface of the first U-phase coil 190, the end surface arranged in the direction of the rotation center axis O is divided in the radial direction of the stator core 141. For this reason, even if the magnetic flux enters the first U-phase coil 190 from this end face, generation of a large eddy current is suppressed.

  FIG. 9 is a cross-sectional view of first U-phase coil 190 in slot 172. As shown in FIG. 9, a plurality of first U-phase coils 190 are inserted into slots 172. And each 1st U-phase coil 190 is mutually independent. On the other hand, each first U-phase coil 190 is composed of a plurality of strands 200.

  Here, in the portion of the first U-phase coil 190 located in the slot 172, a plurality of strands 200 are arranged in the circumferential direction of the stator core 141 and a plurality are arranged in the radial direction of the stator core 141.

  Therefore, even if the magnetic flux enters from the side surface arranged in the circumferential direction of the stator core 141 or the magnetic flux enters from the side surface arranged in the radial direction of the stator core 141 in the outer peripheral surface of the first U-phase coil 190, a large eddy current is generated. It is possible to suppress the occurrence. The circumferential width of the strand 200 is smaller than half the circumferential width of the slot 172, and a plurality of strands 200 can be arranged in the circumferential direction of the slot 172.

  As shown in FIG. 9, in the slot 172, the number of the strands 200 arranged in the circumferential direction of the stator core 141 is smaller than the number of the strands 200 arranged in the radial direction of the stator core 141. For this reason, the circumferential width of the first U-phase coil 190 is kept small, and the circumferential length of the stator core 141 is reduced.

  On the other hand, as shown in FIG. 8, in the portion located on the end face 142 in the first U-phase coil 190, the number of the strands 200 arranged in the radial direction of the stator core 141 is arranged in the direction of the rotation center axis O. The number is less than the number of strands 200 to be performed. For this reason, the radial width of the first U-phase coil 190 is kept small on the end surface 142, and the first U-phase coils 190 are arranged at intervals in the radial direction. A first V-phase coil 192 and the like are disposed between the first U-phase coils 190.

  As described above, in the portion located in the slot 172 in the first U-phase coil 190, the number of the strands 200 arranged in the radial direction is larger than the number of the strands 200 arranged in the radial direction on the end surface 142. It is increasing.

  Thus, the circumferential length of the stator core 141 can be reduced, and the phase coil wires can be arranged in the radial direction of the stator core 141 on the end surface of the stator core 141, thereby reducing the size of the stator core 141. It has been.

  Here, in the example shown in FIG. 8 and FIG. 9, the strand 200 having a square cross section is adopted as each strand 200. More preferably, as shown in FIG. 10 and FIG. A hexagonal strand is used for the cross-sectional shape.

  As shown in FIGS. 10 and 11, when the strand 200 having a hexagonal cross section is adopted, the gap between the strands 200 can be reduced, and the space factor of the coil wire can be improved. be able to. The strands shown in FIGS. 10 and 11 can be formed by pressing a strand having a circular cross section. Here, while it is difficult to manufacture a copper wire having a square cross-sectional shape, it is relatively easy to manufacture a copper wire having a circular cross-sectional shape. When a wire is employed, the strand 200 can be manufactured at a low cost.

  FIG. 12 is a perspective view showing a part of first U-phase coil 190 and second U-phase coil 191. FIG. 11 shows a part of the first U-phase coil 190 and the second U-phase coil 191 mounted on the stator.

  As shown in FIG. 12 and FIG. 4 described above, the first U-phase coil 190 is disposed on the end surface 142, and is connected to one end of the lead portion 190a extending in the circumferential direction and the lead portion 190a, and inserted into the slot. A portion 190b; an insertion portion 190d connected to the other end of the extraction portion 190a and inserted into the slot; and a extraction portion 190c connected to the insertion portion 190b and disposed on the end surface 143. The end surface 142 of the stator core 141 and the end surface 143 of the stator core 141 are arranged in the direction of the rotation center axis O.

  Similarly, the second U-phase coil 191 is disposed on the end surface 142, extends in the circumferential direction, is connected to one end of the drawer 191a, is inserted into the slot, and is inserted into the slot. , And a lead portion 191c disposed on the end surface 143 and an insertion portion 191d connected to the other end of the lead portion 191a.

  FIG. 13 is a perspective view showing a part of the first U-phase coil 190 in detail. As shown in FIG. 13, the first U-phase coil 190 includes a bending portion 190f that connects the extraction portion 190a and the insertion portion 190d, and a bending portion 190e that connects the extraction portion 190a and the insertion portion 190b.

  Here, in the bending part 190e, it curves as it goes to the insertion part 190b from the drawer | drawing-out part 190a side. Further, in the bending portion 190e, the number of the strands 200 arranged in the radial direction increases from the drawing portion 190a side toward the insertion portion 190b.

  Also in the bending portion 190f, the arrangement state and the extending direction of the strands 200 similarly change from the drawing portion 190a side toward the insertion portion 190d side.

  Here, in the bending portion 190e and the bending portion 190f, the wire 200 is not covered with the drawing portion restricting portion 210 and the insertion portion restricting portion 211, and is exposed to the outside.

  For this reason, for example, when oil-cooling the coil end portion of each phase coil, the bending portion 190e and the bending portion 190f are cooled well.

  Although the configuration of the first U-phase coil 190 has been described with reference to FIGS. 12 and 13, the other second U-phase coil 191, first V-phase coil 192, second V-phase coil 193, first W-phase coil 194, The second W-phase coil 195 is configured in the same manner as the first U-phase coil 190.

  Here, in FIGS. 5 and 12, the lead-out portion 190a of the first U-phase coil 190 and the lead-out portion 191a of the second U-phase coil 191 overlap each other when viewed in plan from the rotation center axis O direction.

  For this reason, as shown in FIG. 5, when the end surface 142 is viewed in plan from the direction of the rotation center axis O, the area occupied by the first U-phase coil 190 and the second U-phase coil 191 can be kept small. Note that the first U-phase coil 190 is disposed inside the second U-phase coil 191 on the end face 142 side.

  7 and 12, when the end surface 143 is viewed in plan from the rotation center axis O direction, the lead-out portion 190c of the first U-phase coil 190 and the lead-out portion 191c of the second U-phase coil 191 are in the rotation center axis. Overlapping in the O direction. On the end face 143 side, the first U-phase coil 190 is positioned inside the second U-phase coil 191, and the first U-phase coil 190 is covered with the second U-phase coil 191. Thereby, also on the end surface 143 side, the installation area of the first U-phase coil 190 and the second U-phase coil 191 is kept small.

  That is, the installation area of the U-phase coil 181 is reduced on both the end face 142 and the end face 143.

  As shown in FIGS. 5 and 7, a plurality of first U-phase coils 190 and second U-phase coils 191 are arranged in the radial direction of stator core 141. On the other hand, on end face 142 and end face 143, U-phase coil 181 is provided with a gap in the radial direction of stator core 141, and V-phase coil 182 is arranged between U-phase coils 181. . Here, the V-phase coil 182 and the W-phase coil 183 are also configured in the same manner as the U-phase coil 181, and a plurality of V-phase coils 182 and W-phase coils 183 are arranged at intervals in the radial direction of the stator core 141.

  V-phase coil 182 is disposed so as to pass between W-phase coils 183, and W-phase coil 183 is disposed so as to pass between U-phase coils 181.

  Here, as shown in FIG. 4 and FIG. 5 described above, the insertion portion 190b of the first U-phase coil 190 is inserted into the slot 172a, and the slot 172b is positioned in the slot 172b spaced from the slot 172a in the circumferential direction P. The insertion part 192b of the first V-phase coil 192 is inserted.

  The insertion portion 190d of the first U-phase coil 190 is inserted into the slot 172c located on the opposite side of the slot 172a with respect to the slot 172b. Furthermore, the insertion portion 192d of the first V-phase coil 192 is inserted into the slot 172b located on the opposite side of the slot 172c from the slot 172b.

  The lead portion 190 a of the first U-phase coil 190 extends in the circumferential direction P and extends toward the lead portion 192 a of the first V-phase coil 192. Here, as shown in FIG. 5, the lead-out portion 190 a is bent at the center thereof so as to pass the radially outward side of the lead-out portion 192 a adjacent to the lead-out portion 190 a in the circumferential direction P. . Thereafter, the drawing portion 190a extends in the circumferential direction P between the drawing portions 192a.

  In this way, the lead-out portion 190a is bent, passes the radially outward side of the lead-out portion 192a, and the lead-out portion 190a and the lead-out portion 192a are not arranged in the direction of the rotation center axis O. The height of the direction is kept low. Similarly, the lead-out portion 192a passes through the back side of the lead-out portion 194a, and the lead-out portion 194a passes through the back side of the lead-out portion 190a.

  In addition, in the stator 140 according to the present embodiment, each drawing portion is routed so as to pass through the radially outward side of the other drawing portion adjacent in the circumferential direction P. May be routed through.

  In addition, although each phase coil of the stator 140 according to the present embodiment is wave wound as shown in FIG. 14, each phase coil may be distributed winding and concentrated winding.

  A method of manufacturing each phase coil and stator 140 configured as described above will be described with reference to FIGS.

  FIG. 15 is a perspective view showing a first step of the coil manufacturing process. As shown in FIG. 15, a plurality of strands 300 are prepared. FIG. 16 is a cross-sectional view showing a cross section of each element wire. As shown in FIGS. 15 and 16, a plurality of strands 300 having a square cross-sectional shape are prepared.

  The element wire 300 includes a conducting wire 230 having a square cross section, an insulating film 231 coated on the circumferential surface of the conducting wire 230, and a self-bonding layer 213 coated on the outer circumferential surface of the insulating film 231.

  Then, the bundle of the strands 300 that are brought close together is subjected to press work with a gap in the longitudinal direction of the bundle of the strands 300. And the part to which this press work was given is heated, and the self-fusion layer 213 of the part concerned is melted.

  Thereafter, by cooling the bundle of the strands 300, the self-bonding layer 213 once melted is solidified to form the lead-out portion restraining portion 210 and the insertion portion restraining portion 211, thereby obtaining the coil wire 500 shown in FIG. it can.

  In the coil wire 500 shown in FIG. 17, a plurality of strands 200 are constrained by the drawing portion restraining portion 210 and the insertion portion restraining portion 211, and each drawing portion restraining portion 210 and the insertion portion restraining portion 211 are coil wires. 500 are formed at intervals in the extending direction. And the part located between the insertion part restraint part 211 and the extraction | drawer part restraint part 210 among each strand 200 is exposed outside. It should be noted that the number of arrangements of the strands 200 in the depth direction (the direction from the front side to the back side of the drawing) in each drawing portion restraining portion 210 is the same as the number of strands 200 in the depth direction in each and the insertion portion restraining portion 211. The number of arrays is less.

  The coil wire 500 is subjected to bending or the like, and the first U-phase coil 190, the second U-phase coil 191, the first V-phase coil 192, the second V-phase coil 193, the first W-phase coil 194, and the second W-phase coil. A coil unit 350 is manufactured by manufacturing 195 and combining the manufactured coils.

  Here, for example, when the first U-phase coil 190 is manufactured from the coil wire 500, the exposed portion 196 is bent to form the curved portions 190e and 190f. Thereby, the first U-phase coil 190 can be manufactured.

  Here, when the exposed portion 196 is bent, each strand 200 positioned at the exposed portion 196 is bent. Since the width of the strand 200 is not more than half of the width of the slot 172, the deformation amount on the outer diameter side of the bent portion of the strand 200 is kept small. For this reason, the length by which the self-bonding layer 213 is stretched is kept small in the bent portion. For this reason, even if the strand 200 is bent, the self-bonding layer 213 on the outer diameter side of the bent portion is hardly cracked and the insulation performance of the strand 200 is prevented from being lowered.

  The width of the coil wire 500 in the lead portion restraining portion 210 is defined as a width t, and the thickness of the coil wire 500 is defined as a thickness w.

  When the first U-phase coil 190 is manufactured using a general rectangular wire having a width t and a thickness w, and when the first U-phase coil 190 is manufactured using the coil wire 500 according to the present embodiment. And compare.

  When manufacturing the first U-phase coil 190 from a general rectangular wire, it is necessary to twist and bend the portions of the rectangular wire that become the bending portions 190e and 190f. When the flat wire is curved, the outer diameter side is stretched.

  Here, the width of the wire 200 forming the coil wire 500 is much smaller than the width t of the flat wire. For this reason, when the exposed portion 196 of the coil wire 500 is bent, the amount of stretching of the insulating film 231 of each strand 200 is such that the insulating film formed on the surface of the flat wire is bent when the flat wire is bent. It is much smaller than the stretched amount.

  For this reason, according to the coil wire 500 which concerns on this Embodiment, compared with a general flat wire, it becomes much easier to ensure insulation.

  In particular, it is possible to ensure the insulation of the curved portions 190e and 190f having a large shared voltage when the rotating electrical machine 100 is driven, and to improve the reliability of the rotating electrical machine 100 itself.

  Then, as shown in FIG. 18, the divided stator core 141 a is inserted from the outer peripheral surface side of the manufactured coil unit 350 to manufacture the stator 140.

  In the stator 140 configured as described above, a plurality of strands 200 are exposed to the outside of the curved portions of the U-phase coil 181, the V-phase coil 182, and the W-phase coil 183. In particular, in this curved part, each strand 200 is not restrained. For this reason, the curved portion has a large surface area, and each coil can be efficiently cooled by spraying a coolant such as oil on the portion.

  Moreover, even when the coil end of each coil is molded with resin, the resin enters between the strands 200, and the contact area between the resin and the coil can be improved. Thereby, the heat from a coil can be favorably transmitted to mold resin, and the temperature rise of each coil can be controlled.

  Here, in the examples shown in FIGS. 15 to 18, the case where the coil is manufactured using the strand 300 having a square cross section has been described. It is not limited to things.

  Here, another example of the coil wire manufacturing method will be described with reference to FIGS. 19 and 20. As shown in FIG. 19, a plurality of strands 300 extending in substantially the same direction are prepared. 20 is a cross-sectional view of the plurality of strands 300 shown in FIG. In the example shown in FIG. 20, the strand 300 has a circular cross section.

  Specifically, the strand 300 includes a conducting wire 230 having a circular cross section, an insulating film 231 that covers the peripheral surface of the conducting wire 230, and a self-bonding layer 213 formed on the insulating film 231. ing.

  In a state where a plurality of strands 300 having such a circular cross section are combined, a pressing process is performed at intervals in the longitudinal direction of the bundle of strands 300. Furthermore, the restrained part 201 is formed by heating the pressed part. Thus, by pressing the strand 300 having a circular cross section, the strand has a hexagonal cross section as shown in FIG.

  When a copper wire having a circular cross section is manufactured, it can be manufactured more easily than when a copper wire having a square cross section is manufactured.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Furthermore, the above numerical values are examples, and are not limited to the above numerical values and ranges.

  The present invention can be applied to a coil wire, a stator, and a rotating electrical machine, and is particularly suitable for a coil wire formed from a plurality of strands, a stator provided with this coil wire, and a rotating electrical machine.

  DESCRIPTION OF SYMBOLS 100 Rotating electric machine, 110 Rotating shaft, 120 Rotor, 122 End plate, 123 Permanent magnet, 140 Stator, 141 Stator core, 142, 143 End face, 170 Yoke part, 171 Stator teeth, 172 Slot.

Claims (5)

A stator of a rotating electric machine,
An annular stator core formed with a plurality of slots;
A coil wire provided on the stator core,
The coil wire is
A plurality of strands constrained to each other;
Including a plurality of restraining portions that restrain the strands;
The restraining portion is provided with an interval in the extending direction of the strands,
The cross-sectional shape of the strand in a direction perpendicular to the extending direction of the strand is a hexagonal shape,
The coil wire is drawn from the slot onto an end face arranged in the direction of the center line of the stator core,
The number of radial arrangements of the strands in the slot is different from the number of radial arrangements of the strands on the end face of the stator core,
A plurality of the strands are arranged in the slot in the radial direction of the stator core, and in the slot, the length of the coil wire in the radial direction of the stator core is longer than the circumferential length of the stator core. Formed as
A plurality of the strands are arranged in the direction of the central axis of the stator core on the end face of the stator core,
On the end face of the stator core, a length of the coil wire in the central axis direction of the stator core is longer than a radial length of the stator core. The stator according to claim 1 , wherein a plurality of the coil wires are arranged in the radial direction of the stator core in the slot. The stator according to claim 1 or 2 , wherein a circumferential width of the stator core in the slot is smaller than a half of a circumferential width of the slot in the slot. The coil wire includes an insertion portion inserted into the slot, a drawing portion drawn on the end face of the stator core, and a connection portion connecting the insertion portion and the drawing portion.
The coil wire includes an insertion portion restraining portion that restrains the strands positioned in the insertion portion, and a leading portion restraining portion that restrains the strands located in the leading portion,
It said connecting portion, said were exposed to the outside from the insertion portion for restraining portion and the lead-out portion for restraining portion, a stator according to any one of claims 1 to 3. A rotating electrical machine comprising the stator according to any one of claims 1 to 4 .

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