JP4911441B2 - Rotating electric machine stator and rotating electric machine using the same - Google Patents

Description

  The present invention relates to a stator of a rotating electric machine and a rotating electric machine using the same.

  As a rotating electrical machine that doubles as an electric motor and a generator or is used exclusively as an electric motor or a generator, those disclosed in Patent Documents 1 and 2 are known. In both Patent Documents 1 and 2, a so-called segment conductor (SC) formed in a substantially U-shape is installed in a slot of the stator core, and the open ends of the segment conductor are electrically connected to the stator winding. A line is formed.

  However, in Patent Document 1, since the segment conductors are installed in different slots in the circumferential direction by twisting the center of the turn portions of the segment conductors, they protrude toward both axial ends of the stator core 300 as shown in FIG. The height h of the portion of the stator winding 310 (hereinafter, the portion of the stator winding protruding in the axial direction from the stator core is referred to as “coil end”) is high. There is a problem that 310 protrudes greatly. As shown in FIG. 25, the coil end height h is defined by the interval between the slots 302 in which the segment conductors 320 are installed and the bending angle of the segment conductors 320 at the coil ends. The bending angle of the segment conductor 320 is defined by the thickness of the segment conductor 320 and the coil interval. In other words, the height h of the coil end is defined by the height of a triangle having the interval between the slots 302 in which the segment conductors 320 are installed as the base and the bending angle of the segment conductor 320 as the base angle.

On the other hand, in Patent Document 2, as shown in FIG. 25, a crank-shaped portion 322 without twisting is formed at a substantially central portion of the turn portion of the segment conductor 320 and is flattened, whereby the height of the coil end is increased. Trying to lower.
However, if the interval between the slots 302 in which the segment conductors 320 are installed and the thickness of the segment conductors 320 are the same, in Patent Document 1 and Patent Document 2, the base of the triangle formed by the segment conductors 320 at the coil ends And the base angle are equal. Therefore, even if the segment conductor of Patent Document 2 is adopted, there is a limit in reducing the height of the coil end.

JP-A-11-285216 JP 2003-18778 A

  The present invention has been made to solve the above problems, and an object thereof is to reduce the height of the coil end of the stator winding protruding from the stator core.

  A stator of a rotating electrical machine according to a first aspect includes a stator core having a plurality of slots in the circumferential direction, and a stator winding installed in the slots. The stator winding has a slot accommodating portion accommodated in the slot and a turn portion. A turn part is a part which connects the slot accommodating parts accommodated in the slot from which the circumferential direction differs outside the slot.

  Here, particularly in the present invention, the turn portion has a crank portion and a plurality of step portions. The crank portion is provided at a position farthest in the axial direction from the end face of the stator core, and is a portion parallel to the end face of the stator core. A crank shape is formed in the turn portion by the crank portion. Further, the plurality of step portions are provided between the crank portion and the slot accommodating portion so as to have different positions in the axial direction, and are portions parallel to the end face of the stator core. Since the turn portion includes the crank portion and the plurality of step portions as described above, the height of the coil end is reduced by the amount of the portion parallel to the end face as compared with the turn portion not including the step portion.

  Furthermore, in the present invention, the axial distance between the uppermost step portion and the crank portion is formed to be longer than the axial distance between adjacent step portions in the axial direction. The uppermost step portion refers to a step portion at a position farthest in the axial direction from the end face of the stator core among the plurality of step portions. The “axial distance” is a distance in the axial direction.

  In the case of reducing the height of the coil end, for example, as shown in claim 4, it is conceivable to arrange the turn part so as to overlap with another turn part adjacent in the circumferential direction in the axial direction. Further, for example, as shown in claim 5, it is conceivable to arrange the crank portion so as to overlap the uppermost step portion of another turn portion adjacent in the circumferential direction in the axial direction. For example, when the crank portion and the uppermost step portion are overlapped in the axial direction, the crank portion can be shifted in the radial direction of the stator core by the width of the wire forming the stator winding, as shown in claim 6, for example. Conceivable. Thus, if the stator winding is formed by shifting the wire in the radial direction without any gap, the width in the radial direction of the stator winding can be reduced. The “width” here includes a case where the wire is displaced by the substantial width.

  However, in the configuration in which the crank portion is displaced in the radial direction, if the axial distance between the crank portion and the uppermost step portion is shorter than the axial distance between the step portions, interference may occur in the crank portion.

  In this regard, in the present invention, as described above, since the turn portion is formed so that the axial distance between the uppermost step portion and the crank portion is longer than the axial distance between the step portions, interference occurs in the crank portion. This can be prevented, and the coil end does not increase due to interference, and the height of the coil end can be reduced.

  In addition, as shown in claim 2, the axial distance between the crank portion and the uppermost step portion may be 1.02 to 1.3 times the axial distance between adjacent step portions in the axial direction. Illustrated.

  Specifically, as shown in claim 3, the inclination of the connecting portion that connects the end portion of the crank portion and the end portion of the uppermost step portion, and the connecting portion that connects the end portions of adjacent step portions in the axial direction It is conceivable that the slope is steeper than the slope. Here, “inclination” is based on the end face of the stator core and is a gradient with respect to the end face. In this way, the axial distance can be increased without changing the circumferential distance.

  According to a seventh aspect of the present invention, the length of the step portion parallel to the end face of the stator core is preferably equal to or less than the interval between slots adjacent in the circumferential direction. In this way, for example, when a step portion is provided at a protruding portion from the slot, interference between turn portions protruding from slots adjacent in the circumferential direction can be prevented. As a result, in order to avoid interference, it is possible to prevent the height of the coil end from increasing or the radial width of the coil end from increasing.

  By the way, when the number of phases of the stator winding is k and the number of slots of each phase per pole of the rotor is n, the k-phase stator winding adjacent in the circumferential direction is wound. The total number of slots per pole is k × n.

  Therefore, the stator windings installed across different slots in the circumferential direction are installed in slots separated by k × n in the circumferential direction. Therefore, in order to avoid interference between turn portions protruding from slots adjacent in the circumferential direction, (k × n) stepped step portions are required for the turn portion.

  Therefore, as shown in claim 8, when the number of phases of the stator winding is k, and the number of slots of each phase per pole of the rotor having a plurality of magnetic poles alternately different in the circumferential direction is n, The number of stepped step portions formed in the turn portion may be (k × n). If it does in this way, interference between turn parts can be prevented and, as a result, the height of a coil end can be made still lower.

  For the stator winding described above, for example, as shown in claim 9, it is conceivable to adopt a rectangular cross section. Further, as shown in claim 10, the stator winding may be formed continuously over the entire circumference of the stator core. If it does in this way, the electrical connection location of a stator coil | winding can be reduced as much as possible. As a result, the manufacturing cost of the stator windings can be reduced, and the number of electrical connection points that may cause connection failures such as corrosion can be reduced.

  According to an eleventh aspect, the stator winding has a conductor and an insulating coating covering the outer periphery of the conductor. At this time, the insulation coating has a thickness of 100 to 200 μm. Thus, if the outer periphery of the conductor is covered with an insulating coating having a thickness of 100 to 200 μm, it is advantageous in that it is not necessary to insulate by interposing insulating paper or the like between the stator windings.

  At this time, as shown in claim 12, the insulating coating may have an inner layer and an outer layer covering the outer periphery of the inner layer and having a glass transition temperature lower than that of the inner layer. In this way, the outer layer is crystallized faster than the inner layer due to heat generated in the rotating electrical machine, so that the surface hardness of the outer layer is increased and the stator winding is less likely to be damaged. As a result, even if a process for forming a plurality of step portions in the turn portion is performed, sufficient insulation of the stator winding can be ensured.

  Further, as shown in claim 13, the stator winding may further have a fusion material covering the outer periphery of the insulating coating. Here, the “fusion material” refers to a material that melts by heating and solidifies by cooling. If it does in this way, the slot accommodating parts installed in the same slot can be heat-bonded easily with a fusion material. As a result, the plurality of slot accommodating portions installed in the same slot are integrated, and the mechanical strength of the stator winding in the slot is improved.

  Although the invention has been described as the invention of the stator of the rotating electrical machine, the invention can also be realized as an invention of a rotating electrical machine including the above-described stator as shown in claim 14. Even in this case, the same effects as described above can be obtained.

(A) The perspective view which shows the shape of the wire of 1st Embodiment, (B) The perspective view which shows the stator coil | winding wound by the stator core. (A) Sectional drawing of a wire, (B) Sectional drawing of a wire. (A) The perspective view which shows a stator, (B) The figure which looked at the stator from the side. (A) The perspective view which shows the input part and neutral point of a stator winding, (B) B direction arrow directional view of (A). The schematic diagram which shows the shape of the coil end of a wire. The schematic diagram which shows the structure of the magnetic pole and slot of a rotary electric machine. Explanatory drawing which shows arrangement | positioning of the slot per phase. Winding specification diagram per phase. (A) The perspective view which shows the shape of the wire of 2nd Embodiment, (B) The perspective view which shows the stator coil | winding wound by the stator core. It is the figure which showed the structure of the rotary electric machine of 4th Embodiment. It is a perspective view of the coil of the rotary electric machine of 4th Embodiment. It is the figure which showed the core of the stator of the rotary electric machine of 4th Embodiment. It is the figure which showed the split core which comprises the core of the stator of the rotary electric machine of 4th Embodiment. It is sectional drawing which shows the structure of each phase winding which comprises the coil of the rotary electric machine of 4th Embodiment. It is the figure which showed the connection of the coil of the rotary electric machine of 4th Embodiment. It is the figure which showed the turn part of the stator of the rotary electric machine of 4th Embodiment. It is the figure which showed the interference in a turn part. It is the figure which showed the connection of the coil of the rotary electric machine of 4th Embodiment. It is the figure which showed the connection of the U phase of the coil of the rotary electric machine of 4th Embodiment. It is the figure which showed the molded object of the stator winding | coil which forms the coil of the rotary electric machine of 4th Embodiment. It is the figure which showed the connection state of the U phase in the coil of the rotary electric machine of 4th Embodiment. It is the figure which showed the accommodation position to the slot of the coil | winding of the rotary electric machine of 4th Embodiment. It is the figure which showed the accommodation position to the slot of the coil | winding of the rotary electric machine of 4th Embodiment. (A) The perspective view which shows the conventional stator, (B) The figure which looked at the stator from the side. The schematic diagram which shows the shape of the coil end of the conventional wire.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
A stator according to the first embodiment of the present invention is shown in FIG. The stator 10 shown in FIG. 3 is used, for example, in a rotating electric machine that also serves as a motor and a generator of a vehicle. The stator 10 rotatably accommodates a rotor 60 (see FIG. 6) on the inner peripheral side. The rotor 60 has a plurality of magnetic poles that are alternately changed in the circumferential direction by a permanent magnet on the outer peripheral side facing the inner peripheral side of the stator 10. The stator core 12 is formed in an annular shape by laminating magnetic steel plates having a predetermined thickness in the axial direction. As shown in FIG. 1, the stator core 12 is formed with a plurality of sets of slots in the circumferential direction on the inner circumferential side of the stator core 12 with a pair of slots 14 and 15 adjacent in the circumferential direction along the axial direction. ing. The stator winding 20 is a three-phase winding, and the stator winding 20 of each phase is installed in a pair of slots 14 and 15 adjacent in the circumferential direction. Then, stator windings 20 of different phases are installed in three sets of slots 14 and 15 adjacent in the circumferential direction with the slots 14 and 15 as a set.

  As shown in FIG. 2A, the wire 30 of the stator winding 20 is formed of a copper conductor 32 and an insulating coating made up of an inner layer 34 and an outer layer 36 that cover the outer periphery of the conductor 32 and insulate the conductor 32. ing. The inner layer 34 covers the outer periphery of the conductor 32, and the outer layer 36 covers the outer periphery of the inner layer 34. The thickness of the insulating coating including the inner layer 34 and the outer layer 36 is set between 100 μm and 200 μm. Even when applied to a high voltage rotating electrical machine such as a motor for driving an automobile by setting the thickness of the insulating coating to 100 μm or more, insulation between the wires 30 can be secured, and by setting the thickness of the insulating coating to 200 μm or less, the stator The space factor can be secured. As described above, since the thickness of the insulating coating composed of the inner layer 34 and the outer layer 36 is thick, it is not necessary to insulate by interposing insulating paper or the like between the wire members 30 in order to insulate the wire members 30 from each other.

  The outer layer 36 is formed of an insulating material such as nylon, and the inner layer 34 is formed of an insulating material such as a thermoplastic resin or a polyamideimide having a glass transition temperature higher than that of the outer layer. As a result, the outer layer 36 is crystallized faster than the inner layer 34 due to heat generated in the rotating electrical machine, so that the surface hardness of the outer layer 36 is increased and the wire 30 is less likely to be damaged. For this reason, the insulation of the wire 30 is securable.

  Further, as shown in FIG. 2 (B), the wire 30 of the stator winding 20 has the outer periphery of the insulating coating made of the inner layer 34 and the outer layer 36 covered with a fusion material 37 made of epoxy resin or the like. As a result, the fusion material 37 is melted faster than the insulating coating by the heat generated in the rotating electrical machine, so that the plurality of wires 30 installed in the same slot 14 are thermally bonded to each other by the fusion material 37. As a result, the mechanical strength of the wire 30 in the slot 14 is improved by integrating the plurality of wires 30 installed in the same slot 14. Of course, it is good also as a structure which is not covered with the melt | fusion material 37. FIG.

  As shown in FIG. 1, the wire 30 includes a slot accommodating portion 40 installed in the slots 14 and 15 of the stator core 12, and a slot that protrudes outside the stator core 12 from the slots 14 and 15 and is different in the circumferential direction. 14 and 15, and a turn portion 42 that connects the slot accommodating portions 40 to each other. The stator winding 20 is formed by being wound around the stator core 12. The turn portions 42 are formed on both sides of the stator core 12 in the axial direction. A crank portion 44 without twisting is formed at a substantially central portion of the turn portion 42. The crank portion 44 is formed in a crank shape at a position farthest from the stator core of the turn portion 42, and is formed in parallel to the end surface 13 of the stator core 12. The amount of deviation of the crank portion 44 due to the crank shape is approximately the width of the wire 30. Thereby, the turn parts 42 of the wire 30 adjacent to each other in the radial direction can be densely wound. As a result, since the radial width of the coil end is reduced, the stator winding 20 can be prevented from projecting radially outward.

  Further, on the end faces 13 on both axial sides of the stator core 12 toward the slots where the wire rods 30 are placed across the projecting portions of the turn portion 42 projecting out of the stator core 12 from the slots 14 and 15. A step 46 is formed along the line. As a result, as shown in FIG. 5, the distance between the protruding portions of the turn portions 42 of the wire rods 30 protruding from the slots 14 and 15, in other words, the length of the bottom of the triangular portion formed by the turn portions 42 is determined by the wire rod 30. However, it is narrower than the interval between the slots that are installed. As a result, the height h of the coil end is lowered. In addition, step portions 46 are formed along the end faces 13 on both sides in the axial direction of the stator core 12 at the protruding portions of the turn portions 42. Thereby, the whole shape of the wire 30 which protrudes from the stator core 12 becomes small.

  Further, d1 ≦ d2 is satisfied, where d1 is the length of the stepped portion 46 along the end face 13 of the stator core 12 and d2 is the interval between slots adjacent in the circumferential direction. Therefore, it can prevent that the step part 46 of the wire 30 interferes with the wire 30 which protrudes from the slot adjacent to the circumferential direction. Thereby, in order to avoid that the wire rods 30 protruding from the slots adjacent in the circumferential direction interfere with each other, the height of the coil end is increased or the radial width of the coil end is increased. Can be prevented. As a result, the height of the coil end is reduced. Furthermore, since the radial width of the coil end is reduced, it is possible to prevent the stator winding 20 from protruding outward in the radial direction.

  Furthermore, two step portions 48 are formed on the wire 30 between a crank portion 44 at a substantially central portion of the turn portion 42 and a step portion 46 formed at a protruding portion of the turn portion 42. That is, a total of six step portions and one crank portion are formed in the turn portion 42 of the wire 30 on the end surface 13 side in the one axial direction of the stator core 12. Thereby, the height h of the turn part 42 becomes lower than the height of the triangular turn part 330 that does not form the step part and the crank part. The shape of the stepped portion 48 is also formed in parallel to the end face 13 of the stator core 12, similarly to the stepped portion 46. Therefore, the turn portion 42 of the wire 30 is formed in a step shape having a plurality of step portions in the axial direction of the stator core 12 on both sides of the crank portion 44. At this time, the length of the stepped portion 48 parallel to the end faces 13 on both axial sides of the stator core 12 is equal to or shorter than the interval between the slots 14 and 15 adjacent in the circumferential direction. Thereby, it can prevent that the protrusion location of the turn part 42 interferes with the turn part 42 which protrudes from the slots 14 and 15 adjacent in the circumferential direction. As a result, it is possible to prevent the height h of the coil end from increasing or the radial width of the coil end from increasing in order to avoid interference.

  Here, in the three-phase stator winding 20 of the first embodiment, the wire rods 30 for each phase per pole of the rotor are installed in the two slots 14 and 15. That is, the total number of slots per pole of the rotor of the three-phase stator winding 20 adjacent in the circumferential direction is 3 × 2 = 6. As a result, the wire rods 30 that are installed across the slots 14 and 15 in different circumferential directions are installed in slots that are separated from each other by six in the circumferential direction, so that one crank portion 44 at a substantially central portion of the wire rod 30 is provided. In order to avoid interference between the wires 30 protruding from the slots adjacent to each other in the circumferential direction, (3 × 2) step portions and one crank portion are connected to the turn portion 42 as in the first embodiment. It is desirable to form.

  In the first embodiment, the height of the coil end is reduced by forming six step portions and one crank portion on the wire 30 at the coil end on one axial direction side of the stator core 12 as described above. It is possible to reduce the width of the coil end in the radial direction.

  Next, how to wind the stator winding 20 will be described with reference to FIGS. 6 to 8, the number of magnetic poles of the rotor 60 and the total number of slots of the stator core 12 are reduced in order to simplify the description. In each phase, the slots 14 and 15 are set as one set, and as shown in FIG. 7, four sets of slots 14 and 15 are formed in the stator core 12 at intervals of 90 °. Therefore, different sets of slots 14 and 15 are formed in the stator core 12 at intervals of 30 °. In each of the slots 14 and 15, a total of eight slot accommodating portions 40 of the wire 30 are installed. Numbers 1 to 4 are assigned to the positions where the wire rods 30 are installed from the radially outer side to the inner side of the slots 14 of each set, and the wire rods 30 are installed from the radially outer side to the inside of the slots 15 of each set. 5-8 are attached | subjected to the position currently made.

In FIG. 8, the winding specifications of the one-phase stator winding 20 will be described. In FIG. 8, for example, (1-4) represents the wire 30 installed at the position 4 of # 1 in FIG. 7. As shown in FIG. 8, the wire rods installed at the eight positions of the slots 14 and 15 are first connected in the following positions to form eight groups. Wires at positions (1-1) and (1-5) are connected to the input unit 50 (see FIG. 4). Further, the one-phase stator winding 20 has two winding ends (4-1) and (4-5) as neutral points 52 (see FIG. 4). A total of six neutral points 52 of the three-phase stator winding 20 are collected in one place as shown in FIG. That is, the three-phase stator winding 20 of the first embodiment is star-connected.
(Group 1) (1-1)-(2-2)-(3-1)-(4-2)
(Group 2) (1-2)-(2-1)-(3-2)-(4-1)
(Group 3) (1-3)-(2-4)-(3-3)-(4-4)
(Group 4) (1-4)-(2-3)-(3-4)-(4-3)
(Group 5) (1-5)-(2-6)-(3-5)-(4-6)
(Group 6) (1-6)-(2-5)-(3-6)-(4-5)
(Group 7) (1-7)-(2-8)-(3-7)-(4-8)
(Group 8) (1-8)-(2-7)-(3-8)-(4-7)

And these 8 groups of continuous wires are (1-2) and (4-3), (1-3) and (4-2), (1-4) and (4-8), (1- 6) and (4-7), (1-7) and (4-6), and (1-8) and (4-4) are connected to the neutral point 52 from the input unit 50 shown below. A series of stator wires 20 (# 1) and stator windings 20 (# 2) connected in parallel are formed by continuous wires 30 indicated by dotted lines and solid lines in FIG. Similarly, the other two-phase stator windings 20 each form a pair of stator windings 20 connected in parallel by the continuous wire 30 from the input unit 50 to the neutral point 52. The connection portions 54 of (1-4) and (4-8) and (1-8) and (4-4) shown in FIG. 8 are indicated by the same reference numeral 54 in FIG.
・ Stator winding # 1
(Input section)-(Group 1)-(Group 3)-(Group 8)-(Group 6)-(Neutral point)
・ Stator winding # 2
(Input section)-(Group 5)-(Group 7)-(Group 4)-(Group 2)-(Neutral point)

In this way, since a single-phase stator winding is formed from the input portion 50 to the neutral point 52 by the wire 30 continuous over the entire circumference of the stator core 12, a known segment conductor is electrically connected by welding or the like. As compared with the configuration in which the stator winding from the input unit 50 to the neutral point 52 is formed by connecting to the, the number of electrical connection points can be reduced as much as possible. As a result, the manufacturing cost of the stator winding 20 is reduced, and poor electrical connection of the stator winding 20 can be reduced as much as possible.
In the first embodiment, the radial width of the coil end is reduced and the coil end does not protrude outward in the radial direction, so that the neutral point 52 can be taken out radially outward of the coil end.

(Second Embodiment)
A second embodiment of the present invention is shown in FIG. In addition, the same code | symbol is attached | subjected to the substantially same component as 1st Embodiment.

  In the wire rod 70 of the second embodiment, as in the wire rod 30 of the first embodiment, a crank portion 76 that does not involve twisting is formed at a substantially central portion of the turn portion 74, and the stator 14 extends from the slots 14 and 15. A step 78 along the end face 13 of the stator core 12 is formed at the projecting portion of the turn part 74 projecting out of the core 12 toward the slots where the slot accommodating parts 72 are installed. However, in the wire 70 according to the second embodiment, a straight portion is formed between a crank portion 76 at a substantially central portion of the turn portion 74 and a step portion 78 formed at a protruding portion of the turn portion 74. Is not formed.

  Also in the configuration of the wire rod 70, the length of the bottom of the triangular portion formed by the wire rod 70 protruding from the slots 14 and 15 is narrower than the interval between the slots where the wire rod 70 is installed. . As a result, the height h of the coil end is lowered.

(Third embodiment)
In the above embodiment, the stator 30 of the rotating electrical machine has been described in which the wire rods 30 and 70 of the stator winding 20 are made of the conductor 32 formed of copper. On the other hand, the wire rods 30 and 70 of this embodiment are formed from aluminum. Aluminum is a material having a higher electrical resistance than copper. However, by making the interval between the protruding portions of the turn portion narrower than the interval between the slots where the wire is installed, the shape of the wire protruding from the stator core becomes smaller overall, and the electrical resistance of the entire stator winding Becomes smaller. For this reason, even if the wire rods 30 and 70 are formed from aluminum, the electrical resistance of the entire stator winding can be made comparable to the stator winding of the stator of a conventional rotating electric machine. By forming the conductor 32 from aluminum, it is possible to easily process the wire.

(Fourth embodiment)
The configuration of the rotating electrical machine 401 of the fourth embodiment is shown in FIG. A rotating electrical machine 401 according to the present embodiment is supported by a housing 410 in which a pair of substantially bottomed cylindrical housing members 410a and 410b are joined at openings, and rotatably supported by the housing 410 via bearings 510 and 511. And a stator 403 fixed to the housing 410 at a position surrounding the rotor 402 inside the housing 410.

  The rotor 402 is formed with a plurality of magnetic poles that are alternately different in the circumferential direction by permanent magnets on the outer peripheral side facing the inner peripheral side of the stator 403. The number of magnetic poles of the rotor 402 is not limited because it varies depending on the rotating electric machine. In this embodiment, a rotor 402 having 8 poles (N pole: 4, S pole: 4) is used.

  The stator 403 has a configuration including a three-phase coil 404 formed of a plurality of phase windings shown in FIG. 11 and a stator core 430 shown in FIG.

  As shown in FIG. 12, the stator core 430 has an annular shape in which a plurality of slots 431 are formed on the inner periphery. The plurality of slots 431 are formed so that the depth direction thereof coincides with the radial direction of the stator core 430. The number of slots 431 formed in the stator core 430 is two per one phase of the coil 404 with respect to the number of magnetic poles of the rotor 402. That is, 8 × 3 × 2 = 48 slots 431 are formed.

  The stator core 430 is formed by arranging 24 divided cores 432 shown in FIG. 13 in the circumferential direction. The divided core 432 defines one slot 431 and also defines one slot 431 between the circumferentially adjacent divided cores 432 (a teeth portion 432a extending radially inward and a teeth portion 432a). The core back portion 432b) to be supported is formed.

  The split core 432 constituting the stator core 430 is formed by laminating 410 electromagnetic steel sheets having a thickness of 0.3 mm. An insulating thin film is disposed between the laminated electrical steel sheets. Stator core 430 is not limited to being formed from a laminate of electromagnetic steel sheets, and may be formed using a conventionally known metal thin plate and insulating thin film.

  The coil 404 is formed by winding a plurality of stator windings 440 by a predetermined winding method. As shown in FIG. 14A, the stator winding 440 constituting the coil 404 includes a copper conductor 441 and an insulating coating 442 comprising an inner layer 442a and an outer layer 442b covering the outer periphery of the conductor 441 and insulating the conductor 441. And is formed from. The thickness of the insulating coating 442 including the inner layer 442a and the outer layer 442b is set between 100 μm and 200 μm. As described above, since the thickness of the insulating coating 442 including the inner layer 442a and the outer layer 442b is large, it is necessary to insulate the stator windings 440 with insulating paper or the like sandwiched between the stator windings 440. It is gone. Insulating paper 405 may be provided to insulate the wires from each other.

  Furthermore, as shown in FIG. 14B, the stator winding 440 of the coil 404 may be formed by covering the outer periphery of the insulating coating 442 made of the inner layer 442a and the outer layer 442b with a fusion material 448 made of epoxy resin or the like. Good. As a result, the fusion material 448 is melted faster than the insulating coating 442 by the heat generated in the rotating electrical machine, and therefore the plurality of stator windings 440 installed in the same slot 431 are thermally bonded to each other by the fusion material 448. To do. As a result, the plurality of stator windings 440 installed in the same slot 431 are integrated, so that the mechanical strength of the stator winding 440 in the slot 431 is improved.

  As shown in FIG. 15, the coil 404 is formed by three-phase windings (U1, U2, V1, V2, W1, W2). More specifically, the stator winding 440a forming the U1 phase and the stator winding 440b forming the U2 phase are connected in series, and the stator winding 440c forming the U2 phase and the stator forming the U1 phase. Winding 440d is connected in series, and stator windings 440a, 440b and stator windings 440c, 440d are connected in parallel to form a U-phase winding. Windings are similarly formed in the V phase and the W phase.

  As shown in FIG. 11, the stator winding 440 constituting the coil 404 is wave-wound along the circumferential direction on the inner peripheral side of the stator core 430. Then, a linear slot accommodating portion 443 accommodated in a slot 431 formed in the stator core 430 and a turn portion 444 connecting adjacent slot accommodating portions 443 are provided. The slot accommodating portions 443 are accommodated in the slots 431 for each predetermined number of slots (in this embodiment, 3 phases × 2 (double slots) = 6). The turn part 444 is formed so as to protrude from the end surface of the stator core 430 in the axial direction.

  In the coil 404, the turn portions 444 are formed on both axial sides of the stator core 430, respectively. The substantially central portion of the turn portion 444 is formed so as to form a crank shape without twisting.

  As shown in FIG. 16, stepped portions 444 </ b> D along the end surface of the stator core 430 are formed at all projecting portions of the turn portion 444 that project from the slot 431 to the outside of the stator core 430. In FIG. 16, the step portion 444 </ b> D is provided away from the stator core 430, but may be disposed so as to be in contact with the stator core 430. Further, the turn portion 444 is formed in a stepped shape having a plurality of step portions parallel to the end face of the stator core 430 in the axial direction of the stator core, so that the stepped turn portion 444 of the stator winding 440 is formed. Interference with the stator winding 440 protruding from the slot 431 adjacent in the circumferential direction can be prevented. Thereby, in order to avoid that the stator windings 440 protruding from the slots 431 adjacent in the circumferential direction interfere with each other, the height of the coil end protruding from the end face of the stator core 430 of the coil 404 is increased. Alternatively, it is possible to prevent the radial width of the coil end from increasing. As a result, the height of the coil end is reduced. Furthermore, since the radial width of the coil end is reduced, the coil 404 can be prevented from projecting radially outward.

  The stepped turn portion 444 has a crank portion 444 </ b> A at a position (the highest portion) farthest from the stator core 430. The crank portion 444 </ b> A is formed in parallel to the end face of the stator core 430, and the amount of deviation of the stator core in the radial direction is substantially the width of the stator winding 440. Specifically, the shift amount is 1.0 to 1.3 times the width of the stator winding 440. The turn portion 444 of the stator winding 440 is formed in a stepped shape on both sides with the crank portion 444A interposed therebetween. The crank portion 444A overlaps the turn portion 444 of the stator winding 440 accommodated in the adjacent slot 431 in the vertical direction.

  The turn part 444 is formed in a four-step staircase shape. That is, the turn portion 444 is formed with three steps (444B to 444D) at different positions in the axial direction of the stator core 430, with step portions extending parallel to the end face of the stator core 430. Here, the step portions 444B to 444D are formed so as to be parallel to the end face of the stator core. However, the step portions 444B to 444D do not have to be parallel in a strict sense, and are substantially parallel within a range in which the height of the coil end can be reduced. If it is good. In the present embodiment, the crank portion 444A farthest from the end face of the stator core 430 is excluded, the farthest step portion is the uppermost step portion 444B, the next farther step portion is the second step portion 444C, and the stator core. The step portion closest to the end face of 430 is referred to as a third step portion 444D. Here, the length of the portion parallel to the end face of the stator core 430 of the uppermost step portion 444B, the second step portion 444C, and the third step portion 444D is equal to or less than the interval between the slots 431 adjacent in the circumferential direction.

In the present embodiment, the distance between the crank portion 444A and the uppermost portion 444B l _1, the distance between the uppermost portion 444B and the second step portion 444C l _2, between the second step portion 444C and the third step portion 444D When the distance is l ₃ , l ₁ > l ₂ = l ₃ . For example, l ₁ is 1.02 to 1.3 times as long as l ₂ . Here, each distance may be l ₁ ≧ l ₂ = l ₃ . The height of one step of the step portions 444 </ b> B to 444 </ b> D is approximately the height of the wire forming the stator winding 440. Specifically, the height is 1.0 to 1.3 times the height of the wire. In this embodiment, the distance between the crank portion 444A of the turn portion 444 and the step portions 444B to 444D is as shown schematically in FIG. 16, and the stator core of the crank portion 444A and the step portions 444B to 444D is used. Determined based on surface facing 430. In the present embodiment, since the turn portions 444 are formed in a stepped shape, the turn portions 444 can be overlapped without generating a gap, and the turn portions 444 can be tightly wound.

Further, in the present embodiment, among the distances between the crank portion 444A and the step portions 444B to 444D of the turn portion 444, the distance l ₁ between the crank portion 444A and the uppermost step portion 444B is the other step portions 444B to 444D. It is longer than the respective distances l ₂ and l ₃ . Thereby, when the crank part 444A of the turn part 444 overlaps with another turn part 444, the interference with the stator winding 440 of the other turn part 444 does not occur. At this time, in the turn part 444, the inclination of the connection part that connects the end part of the crank part 444A and the end part of the uppermost step part 444B is the end part of the uppermost step part 444B and the end part of the second step part 444C. The slope is steeper than the slope of the connecting portion connecting the two.

On the other hand, when the distance l ₁ between the crank portion 444A and the uppermost step portion 444B is shorter than the distances l ₂ and l ₃ between the other step portions 444B to 444D (l ₁ <l ₂ = l ₃ ). As shown in FIG. 17, the corner portions in the rectangular cross section of the stator winding 440 constituting the turn portion 444 to be overcome contact each other to cause interference.

  In the present embodiment, the distance between the third step portion 444D of the turn portion 444 and the end surface of the stator core 430 is not particularly limited, but is approximately the height of the wire forming the stator winding 440. Preferably there is.

  In the coil 404, the end portions of the stator windings 440 constituting the coil 404 protrude outward in the radial direction within the range of the height of the coil end where the turn portion 444 protrudes from the stator core 430. . And the end part of each stator winding 440 and the end part on the neutral point side protrudes radially outward at a position higher than the other end part.

  Next, the winding state of the stator winding 440 constituting the coil 404 in the present embodiment will be described more specifically with reference to FIGS.

  The coil 404 of this embodiment is formed by two sets of three-phase windings (U1, U2, V1, V2, W1, W2). FIG. 18 shows the connection state of each of the three-phase windings. The slot numbers in FIG. 18 are the slot 431 in which the slot accommodating portion 443 that is closest to the end on the neutral point side of the stator winding 440 forming the U1 phase is first, and thereafter the stator winding 440 No. 2, No. 3, etc. are provided for convenience along the circumferential direction in which the is wound. FIG. 19 shows a connection state of only the stator winding 440 forming the U phase (U1, U2) of FIG. In FIGS. 18 and 19, a portion formed linearly in the vertical direction corresponds to the slot accommodating portion 443, and an inclined portion on the upper side and the lower side corresponds to the turn portion 444.

  A development view of the coil 404 of the present embodiment is shown in FIG. As shown in FIG. 20, the coil 404 connects the ends of the stator windings 440a and 440c to the neutral point side, and connects the ends of the stator windings 440b and 440d to the phase terminal. On the side.

  The connection method of each phase is the same, and the method of winding the stator winding 440 of the coil 404 will be described using the U phase. The connection state of the stator winding 440 in the U phase is shown in FIG. 21A shows the connection state of 440a and 440b, and FIG. 21B shows the connection state of 440c and 440d. FIG. 22 shows the relationship between the position of the stator windings 440a and 440b in the depth direction in the slot 431 and the position of the turn portion 444. The depth of the stator windings 440c and 440d in the slot 431 is shown in FIG. The relationship between the position in the vertical direction and the position of the turn part 444 is shown in FIG.

  First, the connection state of the stator windings 440a and 440b will be described with reference to FIG. 21 (a) and FIG. The slot 431 in which the U-phase stator winding 440 is accommodated has the rotor 402 having 8 poles, and the stator core 430 has 16 slots (440a-1, 440a-2,..., 440a-8, 440b-1, 440b-2,..., 440b-8) are formed. In the slot 431, eight slot accommodating portions 443 are accommodated in the depth direction. The position where the slot accommodating portion 443 is accommodated in the depth direction of the slot 431 is referred to as No. 8, No. 7, 6,.

  The stator windings 440a and 440b are connected in series, the end of the stator winding 440a-1 is connected to the neutral point of the stator 403, and the end of the stator winding 440b-1 is the stator winding. It is connected to line 440d and connected to the U-phase terminal.

  The stator winding 440a is accommodated in No. 1 of the slot 440a-1 serving as the slot accommodating portion 443 closest to the neutral point. The stator winding 440b is accommodated in No. 1 of the slot 440b-1, which becomes the slot accommodating portion 443 closest to the end of the stator winding 440b.

The slot accommodating portion 443 (next slot accommodating portion 443) connected to the slot accommodating portion 443 accommodated in the slot 440a-1 of the stator winding 440a via the turn portion 444 is arranged in the axial direction of the stator core 430. The end portion connected to the neutral point is connected via a turn portion 444I (lower) on the end portion (hereinafter referred to as the lower side) facing away from the protruding side (hereinafter referred to as the upper side) of the slot 440a-2. Housed in No.2. Thus, the turn part 444I (lower) connects the first slot 440a-1 and the second slot 440a-2 on the lower side of the stator core 430.
The slot accommodating portion 443 next to the stator winding 440a accommodated in the slot 440a-2 is connected through the turn portion 444II (upper) and accommodated in the first slot 440a-3. Thus, the turn part 444II (upper) connects the second slot 440a-2 and the first slot 440a-3 on the upper side of the stator core 430.
The slot accommodating portion 443 next to the stator winding 440a accommodated in the slot 440a-3 is connected via the turn portion 444III (bottom) and accommodated in the second slot 440a-4. In this way, the turn part 444III (lower) connects the first slot 440a-3 and the second slot 440a-4 on the lower side of the stator core 430.

The slot accommodating portion 443 (next slot accommodating portion 443) connected to the slot accommodating portion 443 accommodated in the slot 440b-1 of the stator winding 440b via the turn portion 444 is the axial direction of the stator core 430. The end connected to the U-phase is connected via a turn portion 444II (lower) on the end portion (hereinafter referred to as the lower side) facing away from the protruding side (hereinafter referred to as the upper side). Be housed in the turn. In this way, the turn part 444II (lower) connects the first slot 440b-1 and the second slot 440b-2 on the lower side of the stator core 430.
The slot accommodating portion 443 next to the stator winding 440b accommodated in the slot 440b-2 is connected via the turn portion 444III (upper) and is accommodated in No. 1 of the slot 440b-3. Thus, the turn part 444III (upper) connects the second slot 440b-2 and the first slot 440b-3 on the upper side of the stator core 430.
The slot accommodating portion 443 next to the stator winding 440b accommodated in the slot 440b-3 is connected via the turn portion 444IV (bottom) and accommodated in the second slot 440b-4. Thus, the turn part 444IV (lower) connects the first slot 440b-3 and the second slot 440b-4 on the lower side of the stator core 430.

  As described above, the two stator windings 440a and 440b are arranged in the slot accommodating portion 443, which is adjacent to the turn portions 444II (upper) to 444VII (upper) located on the upper side of the stator core 430. Are connected to No. 1 and No. 2 of the slot accommodating portion 443 adjacent to the turn portions 444I (lower) to 444VIII (lower) located on the lower side. With this connection method, a slot accommodating portion 443 of two stator windings 440a and 440b is installed from the slot 440a-1 to the slot 440a-8 and from the slot 440b-1 to the slot 440b-8. The In the slots 440a-8 and 440b-8, the slot accommodating portion 443 of the stator winding 440a is accommodated second.

  And the slot accommodating part 443 next to the stator windings 440a, 440b in which the slot accommodating part 443 is accommodated second in the slots 440a-8, 440b-8 is the third slot 440a-1, 440b-1. Be contained. In this way, the turn portions 444VIII (upper) and 444I (upper) are connected to the slots 440a-8 and 440b-8 and the slots 440a-1 and 440b-1 at the upper side of the stator core 430. Connecting. That is, when one round is made in the circumferential direction, the joined body is wound in the radially inward direction and shifted to the inside diameter side by one layer.

The stator winding 440a connected to No. 3 of the slot 440a-1 is connected via the turn portion 444I (lower) and is accommodated in No. 4 of the slot 440a-2. In this way, the turn portion 444I (lower) connects the third slot 440a-1 and the fourth slot 440a-2 on the lower side of the stator core 430.
The slot accommodating portion 443 next to the stator winding 440a accommodated in the slot 440a-2 is connected via the turn portion 444II (upper) and accommodated in the third slot 440a-3. Thus, the turn part 444II (upper) connects the No. 4 of the slot 440a-2 and the No. 3 of the slot 440a-3 on the upper side of the stator core 430.

The slot accommodating portion 443 next to the stator winding 440a accommodated in the slot 440a-3 is connected via the turn portion 444III (bottom) and accommodated in No. 4 of the slot 440a-4. In this way, the turn portion 444III (lower) connects the third slot 440a-3 and the fourth slot 440a-4 on the lower side of the stator core 430.
The stator winding 440b connected to No. 3 of the slot 440b-1 is connected via the turn part 444II (bottom) and accommodated in No. 4 of the slot 440b-2. In this way, the turn portion 444II (lower) connects the third slot 440b-1 and the fourth slot 440b-2 on the lower side of the stator core 430.

The slot accommodating portion 443 next to the stator winding 440b accommodated in the slot 440b-2 is connected via the turn portion 444III (upper) and accommodated in the third slot 440b-3. Thus, the turn part 444III (upper) connects the No. 4 of the slot 440b-2 and the No. 3 of the slot 440b-3 on the upper side of the stator core 430.
The slot accommodating portion 443 next to the stator winding 440b accommodated in the slot 440b-3 is connected via the turn portion 444IV (bottom) and accommodated in No. 4 of the slot 440b-4. In this way, the turn part 444IV (lower) connects the third slot 440b-3 and the second slot 440b-4 on the lower side of the stator core 430.

In this way, the two stator windings 440a and 440b are arranged in the third and fourth slots of the slot accommodating portion 443 adjacent to the turn portions 444II (upper) to 444VII (upper) located on the upper side of the stator core 430. Are connected to No. 3 and No. 4 of the slot accommodating portion 443 adjacent to the turn portions 444I (lower) to 444VIII (lower) located on the lower side. With this connection method, a slot accommodating portion 443 of two stator windings 440a and 440b is installed from the slot 440a-1 to the slot 440a-8 and from the slot 440b-1 to the slot 440b-8. The In the slots 440a-8 and 440b-8, the slot accommodating portion 443 of the stator winding 440a is accommodated fourth.
The slot accommodating portion 443 next to the stator windings 440a and 440b in which the slot accommodating portion 443 is accommodated in the fourth slot 440a-8 and 440b-8 is the fifth slot in the slots 440a-1 and 440b-1. Be contained. In this way, the turn portions 444VIII (upper) and 444I (upper) are connected to the slots 440a-8 and 440b-8 and the slots 440a-1 and 440b-1 at the upper side of the stator core 430. Connecting. That is, when one round is made in the circumferential direction, the joined body is wound in the radially inward direction and shifted to the inside diameter side by one layer.

The stator winding 440a connected to No. 5 of the slot 440a-1 is connected via the turn part 444I (bottom) and accommodated in No. 6 of the slot 440a-2. Thus, turn part 444I (bottom) connects slot 5 of slot 440a-1 and slot 6 of slot 440a-2 on the lower side of stator core 430.
The slot accommodating portion 443 next to the stator winding 440a accommodated in the slot 440a-2 is connected via the turn portion 444II (upper) and is accommodated in No. 5 of the slot 440a-3. Thus, turn part 444II (upper) connects slot 6 of slot 440a-2 and slot 5 of slot 440a-3 on the upper side of stator core 430.

The slot accommodating portion 443 next to the stator winding 440a accommodated in the slot 440a-3 is connected via the turn portion 444III (bottom) and accommodated in the sixth slot 440a-4. Thus, turn part 444III (bottom) connects slot 5 of slot 440a-3 and slot 6 of slot 440a-4 on the lower side of stator core 430.
The stator winding 440b connected to No. 5 of the slot 440b-1 is connected via the turn portion 444II (bottom) and accommodated in No. 6 of the slot 440b-2. Thus, turn part 444II (bottom) connects slot 5 of slot 440b-1 and slot 6 of slot 440b-2 on the lower side of stator core 430.

The slot accommodating portion 443 next to the stator winding 440b accommodated in the slot 440b-2 is connected via the turn portion 444III (upper) and accommodated in No. 5 of the slot 440b-3. Thus, the turn part 444III (upper) connects the sixth slot 440b-2 and the fifth slot 440b-3 on the upper side of the stator core 430.
The slot accommodating portion 443 next to the stator winding 440b accommodated in the slot 440b-3 is connected via the turn portion 444IV (bottom) and accommodated in the sixth slot 440b-4. Thus, turn part 444IV (bottom) connects slot 5 of slot 440b-3 and slot 6 of slot 440b-4 on the lower side of stator core 430.
As described above, the two stator windings 440a and 440b are connected to the fifth and sixth slots of the slot accommodating portion 443 adjacent to the turn portions 444II (upper) to 444VII (upper) located on the upper side of the stator core 430. Are connected to No. 5 and No. 6 of the slot accommodating portion 443 adjacent to the turn portions 444I (lower) to 444VIII (lower) located on the lower side. With this connection method, a slot accommodating portion 443 of two stator windings 440a and 440b is installed from the slot 440a-1 to the slot 440a-8 and from the slot 440b-1 to the slot 440b-8. The In the slots 440a-8 and 440b-8, the slot accommodating portion 443 of the stator winding 440a is accommodated sixth.

The slot accommodating portion 443 next to the stator windings 440a and 440b in which the slot accommodating portion 443 is accommodated in the sixth slot 440a-8 and 440b-8 is the seventh slot 440a-1 and 440b-1. Be contained. In this way, the turn portions 444VIII (upper) and 444I (upper) are connected to the slots 440a-8 and 440b-8 and the slots 440a-1 and 440b-1 at the upper side of the stator core 430. Connecting. That is, when one round is made in the circumferential direction, the joined body is wound in the radially inward direction and shifted to the inside diameter side by one layer.
The stator winding 440a connected to No. 7 of the slot 440a-1 is connected via the turn part 444I (bottom) and accommodated in No. 8 of the slot 440a-2. In this way, the turn portion 444I (lower) connects the seventh slot 440a-1 and the eighth slot 440a-2 on the lower side of the stator core 430.

The slot accommodating portion 443 next to the stator winding 440a accommodated in the slot 440a-2 is connected via the turn portion 444II (upper) and is accommodated in the seventh slot 440a-3. In this way, the turn part 444II (upper) connects the eighth slot 440a-2 and the seventh slot 440a-3 on the upper side of the stator core 430.
The slot accommodating portion 443 next to the stator winding 440a accommodated in the slot 440a-3 is connected via the turn portion 444III (bottom) and accommodated in the eighth slot 440a-4. Thus, turn part 444III (bottom) connects slot 7 of slot 440a-3 and slot 8 of slot 440a-4 on the lower side of stator core 430.

Stator winding 440b connected to No. 7 of slot 440b-1 is connected via turn part 444II (bottom) and is accommodated in No. 8 of slot 440b-2. Thus, turn part 444II (bottom) connects slot 7 of slot 440b-1 and slot 8 of slot 440b-2 on the lower side of stator core 430.
The slot accommodating portion 443 next to the stator winding 440b accommodated in the slot 440b-2 is connected via the turn portion 444III (upper) and accommodated in the seventh slot 440b-3. Thus, turn part 444III (upper) connects slot 8 of slot 440b-2 and slot 7 of slot 440b-3 on the upper side of stator core 430.

The slot accommodating portion 443 next to the stator winding 440b accommodated in the slot 440b-3 is connected via the turn portion 444IV (bottom) and accommodated in the eighth slot 440b-4. Thus, turn part 444IV (bottom) connects slot 7 of slot 440b-3 and slot 8 of slot 440b-4 on the lower side of stator core 430.
As described above, the two stator windings 440a and 440b are connected to the seventh and eighth slots of the slot accommodating portion 443 adjacent to the turn portions 444II (upper) to 444VII (upper) located on the upper side of the stator core 430. Are connected to No. 7 and No. 8 of the slot accommodating portion 443 adjacent to the turn portions 444I (lower) to 444VIII (lower) located on the lower side. With this connection method, a slot accommodating portion 443 of two stator windings 440a and 440b is installed from the slot 440a-1 to the slot 440a-8 and from the slot 440b-1 to the slot 440b-8. The In the slots 440a-8 and 440b-8, the slot accommodating portion 443 of the stator winding 440a is accommodated eighth.

  And the slot accommodating part 443 accommodated in the eighth of the slots 440a-8 and 440b-8 is connected. Thus, the stator windings 440a and 440b are wound around the stator core 430.

Next, the connection state of the stator windings 440c and 440d is as shown in FIG. 21 (b) and FIG. 23 and is connected in the same manner as the stator windings 440a and 440b. Omitted.

In this embodiment, the distance between the crank portion 444A of the turn portion 444 and the step portions 444B to 444D satisfies l ₁ > l ₂ = l ₃ (or l ₁ ≧ l ₂ = l ₃ ), so that different turn portions Interference between the stator windings 440 constituting the 444 is suppressed, the turn portions 444 can be overlapped without generating a gap due to interference, and the turn portions 444 can be tightly wound.
Furthermore, in this embodiment, the distance between the crank portion 444A and the uppermost step portion 444B is formed long, and interference between the turn portions can be prevented when the turn portion overlaps with another turn portion.

(Other embodiments)
In the above embodiment, the stator of the rotating electrical machine that also serves as the electric motor and the generator has been described. On the other hand, you may apply the stator of the said embodiment as a stator of the rotary electric machine for exclusive use of either an electric motor or a generator.

  Moreover, in the said embodiment, the stator winding | coil of each phase was formed with the wire which continued over the perimeter of the stator core 12. FIG. On the other hand, U-shaped segment conductors are connected to each other by welding or the like, and the crank portions and step portions shown in the first embodiment or the second embodiment are formed on the segment conductors to form stator windings. May be.

Further, the stator winding is not limited to three phases but may be multiphase. In this case, if the number of phases of the multiphase stator winding is k and the number of slots of each phase per pole of the rotor is n, the number of stepped portions formed in the turn portion of the wire is (k × n ) Is desirable.
Moreover, in the said embodiment, the crank part was formed in the approximate center part of the turn part. On the other hand, as long as the step portion is formed at the protruding portion of the turn portion protruding from the slot, the shape may be such that the crank portion is not formed at the substantially central portion of the turn portion.
Moreover, in the said embodiment, the rotor was installed in the inner peripheral side of the stator, and the structure which a stator faces the rotor on the inner peripheral side was demonstrated. On the other hand, the structure which installs a rotor in the outer peripheral side of a stator, and a stator faces a rotor on the outer peripheral side may be employ | adopted.

In the above embodiment, the three-phase stator winding 20 is star-connected. On the other hand, the three-phase stator winding may be an annular delta connection.
Thus, the present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the spirit of the invention.

10: Stator, 12: Stator core, 13: End face, 14, 15: Slot, 20: Stator winding, 30: Wire rod, 32: Conductor, 34: Inner layer, 36: Outer layer, 37: Fusing material, 40: Slot accommodating part, 42: Turn part, 44: Crank part, 46: Stair part, 48: Stair part, 50: Input part, 52: Neutral point, 54: Connection part, 60: Rotor, 70: Wire rod 72: Slot housing part, 74: Turn part, 76: Crank part, 78: Stair part, 300: Stator core, 302: Slot, 310: Stator winding, 320: Segment conductor, 322: Crank shape part, 330: Turn part, 401: Rotating electric machine, 402: Rotor, 403: Stator, 404: Coil, 410: Housing, 420: Rotating shaft, 430: Stator core, 431: Slot, 432: Split core, 440: Winding, 4 1: Conductor, 442: Insulation coating, 442a: Inner layer, 442b: Outer layer, 443: Slot receiving portion, 444: Turn portion, 444A: Crank portion, 444B: Top step portion, 444C: Second step portion, 444D: Third Step 448: Fusing material

Claims (14)

In a stator of a rotating electric machine comprising a stator core having a plurality of slots in the circumferential direction, and a stator winding installed in the slot,
The stator winding includes: a slot accommodating portion accommodated in the slot; and a turn portion that connects the slot accommodating portions accommodated in the slots having different circumferential directions to each other outside the slot. Have
The turn part is
A crank portion that is provided at a position farthest from the end face of the stator core in the axial direction and forms a crank shape, and is parallel to the end face of the stator core;
A plurality of step portions provided between the crank portion and the slot accommodating portion so as to have different positions in the axial direction, and parallel to an end face of the stator core;
Among the plurality of step portions, the axial distance between the uppermost step portion located farthest in the axial direction from the end face of the stator core and the crank portion is greater than the axial distance between the adjacent step portions in the axial direction. The stator of the rotating electrical machine is characterized by being formed to be longer. The axial distance between the crank portion and the uppermost step portion is 1.02 to 1.3 times the axial distance between adjacent step portions in the axial direction. The stator of the described rotating electrical machine. The inclination of the connecting portion connecting the end portion of the crank portion and the end portion of the uppermost step portion is steeper than the inclination of the connecting portion connecting the end portions of adjacent step portions in the axial direction. The stator of the rotary electric machine according to claim 1 or 2. The stator of a rotating electrical machine according to any one of claims 1 to 3, wherein the turn part is arranged to overlap with another turn part adjacent in the circumferential direction in the axial direction. The rotating electric machine according to any one of claims 1 to 4, wherein the crank portion is disposed so as to overlap the uppermost step portion of another turn portion adjacent in the circumferential direction in the axial direction. Stator. The rotating electric machine according to any one of claims 1 to 5, wherein the crank portion is displaced in a radial direction of the stator core by a width of a wire forming the stator winding. stator. The length of the step portion parallel to the end face of the stator core is equal to or less than an interval between the slots adjacent to each other in the circumferential direction. Stator for rotating electric machine. When the number of phases of the stator winding is k, and the number of slots of each phase per pole of a rotor having a plurality of magnetic poles that are alternately different in the circumferential direction is n, the turns formed in the turn portion The stator of the rotating electrical machine according to claim 1, wherein the number of stepped portions is (k × n). The stator of a rotating electrical machine according to any one of claims 1 to 8, wherein the stator winding has a rectangular cross-sectional shape. The stator of a rotating electrical machine according to any one of claims 1 to 9, wherein the stator winding is formed continuously over the entire circumference of the stator core. The stator winding has a conductor and an insulating coating covering the outer periphery of the conductor,
The stator for a rotating electrical machine according to any one of claims 1 to 10, wherein the insulating coating has a thickness of 100 to 200 µm. The stator for a rotating electrical machine according to claim 11, wherein the insulating coating includes an inner layer and an outer layer covering an outer periphery of the inner layer and having a glass transition temperature lower than that of the inner layer. The stator of a rotating electric machine according to claim 11 or 12, wherein the stator winding further includes a fusion material covering an outer periphery of the insulating coating. A stator for a rotating electrical machine according to any one of claims 1 to 13,
A rotating electrical machine comprising: a rotor having magnetic poles alternately formed in a circumferential direction on an inner peripheral side or an outer peripheral side of the stator.

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