Armature for an electrical machine

Abstract

An armature for an electric machine, the armature comprising: an armature core (11) in which a plurality of slots (13) are arranged in a slot width direction; and an armature winding (20) mounted on the armature core (11), characterized in that the armature winding (20) comprises a plurality of two-track first winding bodies (22, 22B), each formed from two seamless, continuous conductor wires (19) coated with insulation; the two-track first winding bodies (22, 22B) are arranged at a distance of one slot in the slot arrangement direction, so that the two conductor wires are mounted in a third slot (133), a first slot (131), and a second slot (132), which are sequentially arranged in the slot arrangement direction at an angular pitch of p slots, where p is a natural number greater than or equal to 2;that the two conductor wires (19) forming the two-lane first winding bodies (22, 22B) are layered in a slot depth direction of the armature core (11); that the two-lane first winding bodies (22, 22B) have a number m of a coil pattern in which the two conductor wires (19) layered in the slot depth direction are sequentially inserted into the first slot (131), the second slot (132), the first slot (131), and the third slot (133), where m is a natural number greater than or equal to 1; and that the number m of the coil pattern are lined up in the slot depth direction.

Description

Technical area

[0001] The present invention relates to an armature for an electrical rotary machine, such as an electric motor, or for an electrical machine, such as a direct-acting machine, such as a linear motor. It particularly relates to an armature winding construction. State of the art

[0002] Recently, compactness, high output power and high voltage tolerances are required to implement voltage rises in electrical rotating machines, such as electric motors or generators.

[0003] To make these types of rotating electric machines more compact, armature windings have been used that use concentrated windings, in which conductor wires are wound onto individual armature core teeth. This is done with the aim of making coil ends more compact and not generating magnetic flux. However, compact armatures are also needed that use armature windings with a distributed winding design, which can suppress torque fluctuation and increase output power.

[0004] In addition, the demand for induction motors that do not use magnets has also increased due to the sharp rise in magnet prices. There is a need for armatures that use armature windings, which have distributed winding designs with higher efficiency.

[0005] In contrast to concentrated windings, which are configured by winding conductor wires onto individual teeth, windings configured by winding conductor wires into slots spaced two or more apart are called "distributed windings." In other words, distributed windings are windings wound so that a conductor wire extending outward from one slot spans two or more consecutive teeth and then enters another slot.

[0006] In Patent Literature 1, winding coils formed in a helical shape by winding a conductor wire multiple times (also known as "hexagonal coils") are accommodated in respective pairs of slots spaced by a plurality of slots to form an armature winding having a distributed winding structure. Furthermore, the distance between the two slots forming the pair of slots is determined based on the number of slots and the number of poles in the armature.

[0007] In Patent Literature 2, coil segments formed by being bent into a U-shape are accommodated in the respective pairs of slots spaced by a plurality of slots, end portions of the coil segments are bent and folded, and the bent and folded end portions of the coil segments are welded together to form an armature winding having a distributed winding structure.

[0008] In Patent Literature 3, a coil assembly manufactured by weaving a plurality of wave-wound coils in which conductor wires are formed with wave shapes is mounted on a rectangular parallelepiped core, the same core is wound in a ring shape, and butt portions of the wound core are welded to form an armature winding having a distributed winding structure.

[0009] Patent Literature 4 relates to an armature winding structure for an armature of an electric machine.

[0010] Patent Literature 5 discloses a coil, a stator, and a method for manufacturing a coil.

[0011] Patent Literature 6 teaches a continuously wound coil in which a plurality of coil elements formed by one or more rectangular wires are connected to be adjacent to each other. BibliographyPatent literature Patent literature 1: JP 5 040 303 B2 Patent literature 2: JP 3 508 755 B2 Patent literature 3: JP 3 593 009 B2 Patent literature 4: US 8 294 324 B2 Patent Literature 5: CN 1 02 638 121 A Patent literature 6: JP 2008 - 278 677 A Summary of the inventionProblems to be solved by the invention

[0012] In Patent Literature 1, the apex portions of coil ends, which are arrays of return portions of the hexagonal coils, are formed with a crank shape that is offset in a direction of alignment of the return portions by a value proportional to the full widths of the return portions in the direction of alignment. The hexagonal coils are inserted between a lower portion end of a first slot of the pair of slots and an opening portion side of a second slot. Consequently, when the apex portions and the coil ends are formed by bending them into crank shapes, the bending radius increases, and there is a problem that the radial dimensions and axial dimensions of the coil ends become larger.

[0013] In Patent Literatures 2 and 3, since the apex portions of the return portions of the coil segments and the wave-wound coils are formed with offset shapes offset by a width of a single conductor wire, the bending radius is reduced when the apex portions of the return portions are formed by bending into the offset shapes, which prevents an increase in the radial dimensions and the axial dimensions of the coil ends.

[0014] However, in Patent Literature 2, since the number of coil segments constituting the armature winding is increased, which also increases the number of welding points, problems arise in that the cycle time during production is increased and quality problems are also easy to occur. In Patent Literature 3, one of the problems is that the step of winding the wave-wound coils is complicated, which reduces productivity. Furthermore, in Patent Literatures 2 and 3, the positions at the coil ends where coils of different phases, where the electric potential differences are comparatively large, are in close proximity to each other in the radial direction increase. One of the problems is that there is an increased risk of dielectric breakdown, which occurs when a higher voltage is applied.

[0015] The present invention aims to solve the above problems. Therefore, it is an object of the present invention to provide an armature for a compact, high-output electric machine, in which a coil shape of a distributed winding is adjusted to increase the ease of forming the distributed winding coil, to reduce the positions of radial proximity between different-phase coils that have larger electric potential differences, and to suppress the increase in the diameter of the coil ends resulting from the shaping of the apex portions into the offset shape by bending. Ways to solve the problem

[0016] The problem underlying the invention is solved by an anchor having the features of independent claim 1. Furthermore, the problem is solved by an anchor having the features of independent claim 2. Advantageous developments of the anchor are specified in dependent claims 3 to 8. Effects of the invention

[0017] According to the present invention, since two-lane winding bodies, manufactured by stacking and winding two conductor wires, are mounted in three slots sequentially arrayed in the slot arrangement direction at an angular pitch of p slots, the offset value at the top portions of the coil end portions is twice the width of the conductor wires in the slot depth direction. Consequently, when the top portions of the coil end portions are bent into a crimp shape, the bending radius decreases compared to the case where hexagonal coils are used. This allows the radial dimensions and axial dimensions of the coil ends to be reduced.

[0018] Since the two-track winding bodies are manufactured to be mounted in three slots arranged one after the other in the slot arrangement direction at an angular pitch of p slots, the number of welding spots is reduced compared to the coil segments, which reduces the cycle time during production and also prevents the occurrence of quality problems.

[0019] Since the armature winding can be manufactured by assembling the two-lane winding bodies sequentially from the direction of the slot arrangement, the complicated step of weaving wave-wound coils is no longer necessary, which increases productivity.

[0020] Since the conductor wires constituting the two-track winding bodies are wound to cyclically extend over three slots by bending back at the second and third slots located on either side of a first slot, the directions in which the coil end portions are offset in the slot depth direction alternate. Consequently, the positions at which different-phase coil end portions, where the electrical potential differences are comparatively large, approach each other in the slot depth direction are reduced, reducing the risk of dielectric breakdown. Short description of the drawings Fig. 1 is a half-sectional view showing an electric rotary machine according to Embodiment 1 of the present invention; Fig. 2 is an oblique projection showing a part of the rotary electric machine according to Embodiment 1 of the present invention; Fig. 3 is an oblique projection showing an armature used in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 4 is an oblique projection showing a core block constituting a part of the armature used in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 5 is an oblique projection showing a two-lane winding body constituting an armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 6 is an end view showing the two-lane winding body constituting a part of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 7 is a front view showing the two-lane winding body constituting a part of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 8 is a schematic diagram of a state in which the armature winding is mounted on the armature core in the rotary electric machine according to Embodiment 1 of the present invention, when viewed from the vicinity of first coil ends; Fig. 9 shows diagrams explaining a method of constructing the armature winding of the rotary electric machine according to Embodiment 1 of the present invention; Fig. 10 shows diagrams explaining the method of constructing the armature winding of the rotary electric machine according to Embodiment 1 of the present invention; Fig. 11 is an oblique projection showing the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 12 is a diagram explaining a method of constructing the armature of the rotary electric machine according to Embodiment 1 of the present invention; Fig. 13 is a diagram explaining the method of constructing the armature of the rotary electric machine according to Embodiment 1 of the present invention; Fig. 14 is a diagram explaining a method of connecting a U-phase coil of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 15 is an oblique projection showing the U-phase coil of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 16 is a diagram explaining the method of connecting the U-phase coil of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 17 is a diagram explaining a method of connecting a V-phase coil of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 18 is a partial oblique projection showing the vicinity of electric power supply portions of the U-phase coil of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 19 is a partial oblique projection showing the vicinity of electric power supply portions of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 20 is a partial end view showing second coil ends of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 21 is a partial end view schematically showing second coil ends of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 22 is a partial end view schematically showing second coil ends of a conventional armature winding; Fig. 23 is an end view schematically showing a two-lane winding body constituting a part of an armature winding in a rotary electric machine according to Embodiment 2 of the present invention; Fig. 24 is an end view schematically showing a two-lane winding body constituting a part of an armature winding in a rotary electric machine according to Embodiment 3 of the present invention; Fig. 25 is a diagram explaining a method of connecting a U-phase coil of an armature winding in a rotary electric machine according to Embodiment 4 of the present invention; Fig. 26 is a partial oblique projection showing the vicinity of electric power supply portions of the U-phase coil of the armature winding in the rotary electric machine according to Embodiment 4 of the present invention; Fig. 27 is a partial oblique projection showing the vicinity of electric power supply portions of the armature winding in the rotary electric machine according to Embodiment 4 of the present invention; Fig. 28 is a diagram explaining a method of connecting a U-phase coil of an armature winding in a rotary electric machine according to Embodiment 5 of the present invention; and Fig. 29 is an oblique projection showing an armature in the rotary electric machine according to Embodiment 5 of the present invention. Description of the embodiments

[0021] Preferred embodiments of an armature for an electric machine according to the present invention will be described below with reference to the drawings. Embodiment 1

[0022] Fig. 1 is a half-sectional view showing an electric rotary machine according to Embodiment 1 of the present invention; Fig. 2 is an oblique projection showing a part of the rotary electric machine according to Embodiment 1 of the present invention; Fig. 3 is an oblique projection showing an armature used in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 4 is an oblique projection showing a core block constituting a part of the armature used in the rotary electric machine according to Embodiment 1 of the present invention.

[0023] Fig. 5 is an oblique projection showing a two-lane winding body constituting an armature winding in the rotary electric machine according to Embodiment 1 of the present invention; Fig. 6 is an end view showing the two-lane winding body constituting a part of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention.

[0024] Fig. Fig. 7 is a front view showing the two-lane winding body constituting a part of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; and Fig. Fig. 8 is a schematic diagram of a state in which the armature winding is mounted on the armature core in the rotary electric machine according to Embodiment 1 of the present invention, when viewed from the vicinity of first coil ends. For the sake of simplicity, coil end portions in Fig. 8 shown with solid lines.

[0025] In the Fig. 1 and Fig. 2, a rotary electric machine 100 functioning as an electric machine includes: a housing 1 having a cylindrical frame 2 with a bottom; and an end plate 3 closing an opening of the frame 2; an armature 10 fixed to a cylindrical portion of the frame 2 in an internally fitted state; and a rotor 5 fixed to a rotary shaft 6 rotatably supported in the bottom portion of the frame 2 and the end plate 3 by means of bearings 4 so as to be rotatably disposed on the inner peripheral side of the armature 10.

[0026] The rotor 5 is a permanent magnet rotor, including a rotor core 7 fixed to the rotating shaft 6, which passes through a central portion thereof; and permanent magnets 8 embedded near an outer peripheral surface of the rotor core 7 so as to be arranged at a uniform pitch in the circumferential direction to form magnetic poles. Furthermore, the rotor 5 is not limited to a permanent magnet rotor.

[0027] A squirrel-cage rotor can also be used, in which uninsulated rotor conductors are accommodated in slots of a rotor core so that two sides are short-circuited by means of a short-circuit ring, or a slip-ring rotor can be used, in which insulated conductor wires are mounted in slots of a rotor core, etc.

[0028] The configuration of the armature 10 is described in detail below with reference to the Fig. 3 to 7 explained.

[0029] As in Fig. As shown in Figure 3, the armature 10 includes an armature core 11; and an armature winding 20 mounted on the armature core 11. To simplify the explanation, the number of poles p in the rotor 5 is eight, the number of slots s in the armature core 11 is forty-eight, and the armature winding 20 is a three-phase winding. In other words, the slots are formed on the armature core 11 in a ratio of two slots per phase per pole.

[0030] As in Fig. 4, core blocks 12 are formed by dividing the annular armature core 11 into twenty-four equal sections in the circumferential direction, and are manufactured by laminating and integrating electromagnetic steel sheets, and include: a rear core portion 12a having a round arcuate cross section; and two teeth 12b arranged to project radially inward from an inner circumferential wall surface of the rear core portion 12a.

[0031] The armature core 11 is constructed in a ring shape by arranging and integrating twenty-four core blocks 12 in the circumferential direction, by abutting the circumferential side surfaces of the rear core portions 12a such that the teeth 12b are oriented radially inward. Grooves 13 formed by the rear core portions 12a and circumferentially adjacent teeth 12b are arranged at a uniform angular pitch in the circumferential direction so as to be open on an inner circumferential side. The teeth 12b are formed to have a tapered shape, with the circumferential width gradually narrowing radially inward, and the cross section of the grooves 13 is rectangular.

[0032] A two-track winding body 22 is formed by winding two conductor wires 19 in an edgewise winding. The two conductor wires 19 are each made of seamless, continuous copper wire or aluminum wire coated with an insulating varnish resin, for example, having flat shapes (elongated cross sections) with a width d on the short side and being layered in the short side direction. Since the two-track winding bodies 22 are wound in an edgewise winding, the short side direction of the conductor wires 19 is aligned in the radial direction of the armature 10, and the long side direction of the conductor wires 19 is aligned in the circumferential direction of the armature 10.

[0033] As in the Fig. 5 to 7, the two-lane winding bodies 22 are distributed windings including: first rectilinear portions 22a (first rectilinear portions 221a and 222a) and third rectilinear portions 22c (third rectilinear portions 221c and 222c) inserted into a first slot; second rectilinear portions 22b (first rectilinear portions 221b and 222b) inserted into a second slot spaced from the first slot at an angular pitch of six slots in a first circumferential direction; fourth rectilinear portions 22d (fourth rectilinear portions 221d and 222d) inserted into a fourth slot spaced from the first slot at an angular pitch of six slots in a second circumferential direction; first coil end portions 22e (first coil end portions 221e and 222e) connecting the second longitudinal ends of the first straight portions 22a and the second straight portions 22b;second coil end portions 22f (second coil end portions 221f and 222f) connecting the first longitudinal ends of the second rectilinear portions 22b and the third rectilinear portions 22c; third coil end portions 22g (third coil end portions 221g and 222g) connecting the second longitudinal ends of the third rectilinear portions 22c and the fourth rectilinear portions 22d; and winding ends 22h (winding ends 221h and 222h) and winding ends 22j (winding ends 221j and 222j) extending outward from the first longitudinal ends of the first rectilinear portions 22a and the fourth rectilinear portions 22d, and connected to other winding bodies or to electric power supply portions.

[0034] Consequently, the two-lane winding bodies 22 include: a radially outer winding body 221 formed by the conductor wire 19 arranged on the radially outer side of the two conductor wires 19 layered in the short-side direction; and a radially inner winding body 222 formed by the conductor wire 19 arranged on the radially inner side of the two conductor wires 19 layered in the short-side direction.

[0035] The radially outer winding body 221 includes the first to fourth rectilinear portions 221a to 221d; the first to third coil end portions 221e to 221g; and the winding ends 221h and 221j. The winding ends 221h and 221j extend outward from the first longitudinal ends of the first and fourth rectilinear portions 221a and 221d so as to be inclined in the circumferential direction so as to approach each other without changing the radial positions.

[0036] The radially inner winding body 222 includes the first to fourth rectilinear portions 222a to 222d; the first to third coil end portions 222e to 222g; and the winding ends 222h and 222j. The winding ends 222h and 222j extend outward from the first longitudinal ends of the first and fourth rectilinear portions 222a and 222d so as to be inclined in the circumferential direction, thereby separating from each other without changing the radial positions.

[0037] The first straight portions 22a and the second straight portions 22b are arranged to be radially offset by 2d at crank portions 22k formed at upper positions of the first coil end portions 22e. The second straight portions 22b and the third straight portions 22c are similarly arranged to be radially offset by 2d at crank portions 22k formed at upper positions of the second coil end portions 22f.

[0038] The third straight portions 22c and the fourth straight portions 22d are similarly arranged to be radially offset by 2d at crank portions 22k formed at upper positions of the third coil end portions 22g. Furthermore, the angular pitch of six slots is a distance between the slot centers of the slots 13 on two sides of six consecutive teeth 12b.

[0039] As in Fig. 8, the two-lane winding bodies 21 configured in this way are mounted on the armature core 11 such that the two conductor wires 19 are inserted into a first slot 131 from near a first end of the armature core 11, extend outward from the first slot 131 at a second end of the armature core 11, are inserted from a second end of the armature core 11 into a second slot 132 spaced by an angular pitch of six slots in a first circumferential direction, extend outward from the second slot 132 at a first end of the armature core 11, are inserted from the first end of the armature core 11 into a second slot 131 spaced by an angular pitch of six slots in the second circumferential direction, extend outward from the first slot 131 at the second end of the armature core 11, and are inserted from the second end of the armature core 11 into a third slot 133 are introduced,which is spaced by an angular distance of six grooves in the second circumferential direction, and extends outwardly from the third groove 133 at the first end of the armature core 11.

[0040] In addition, Fig. 8, for the convenience of description, the grooves 13 which are arranged circumferentially at an angular interval of six grooves are referred to as the third groove 133, the first groove 131 and the second groove 132 in this order in the circumferential direction. In addition, Fig. 8, the first to third coil end portions 22e to 22g are shown rectilinearly, but the second rectilinear portions 22b inserted into the third groove 133 have the paths reversed by 2d radially outward at the offset portions 22k of the first coil end portions 22e relative to the first rectilinear portions 22a inserted into the first groove 131.

[0041] The third rectilinear portions 22c inserted into the first groove 131 have their paths radially outwardly reversed by 2d at the offset portions 22k of the second coil-end portions 22f relative to the second rectilinear portions 22b inserted into the second groove 132. The fourth rectilinear portions 22d inserted into the third groove 133 also have their paths radially outwardly reversed by 2d at the offset portions 22k of the third coil-end portions 22g relative to the third rectilinear portions 22c inserted into the first groove 131.

[0042] A method of constructing the armature 10 will be described below with reference to Fig. 9 to 13 described. Fig. 9 and Fig. 10 shows diagrams explaining the method of constructing the armature winding of the rotary electric machine according to Embodiment 1 of the present invention; Fig. 11 is an oblique projection showing the armature winding in the rotary electric machine according to Embodiment 1 of the present invention; and Fig. 12 and Fig. 13 are diagrams explaining a method of constructing the armature of the rotary electric machine according to Embodiment 1 of the present invention.

[0043] In addition, for the sake of simplicity, the coil end areas in Fig. 9 is shown in a straight line, and the armature winding is shown only using straight lines in Fig. 12 and Fig. 13. For convenience, forty-eight two-lane winding bodies 22 are referred to as "first two-lane winding body 221," "second two-lane winding body 222," "third two-lane winding body 223," and so on, up to "forty-eighth two-lane winding body 2248," in the order of assembly. Furthermore, the longitudinal direction, the short-side direction, and the long-side direction of the first to fourth rectilinear portions 22a to 22d are referred to as an axial direction, a radial direction, and a circumferential direction, respectively.

[0044] As in Fig. 9(a), first, the second two-lane winding body 222 is arranged on a first circumferential side of the first two-lane winding body 221 so that its axial position is aligned with the axial position of the first two-lane winding body 221. As shown in Fig. 9(b), the second two-track winding body 222 is then moved in the second circumferential direction without changing its axial position.

[0045] As in Fig. Next, as shown in Figure 9(c), the second two-lane winding body 222 is assembled to the first two-lane winding body 221. Thereafter, the third two-lane winding body 223 is assembled to the second two-lane winding body 222. This procedure is repeated to assemble from the first two-lane winding body 221 to the forty-seventh two-lane winding body 2247, thereby obtaining a C-shaped intermediate structure 21.

[0046] Thereafter, the intermediate structure 21 is spread until it is wider than the circumferential width of the forty-eighth two-lane winding body 2248 between the first two-lane winding body 221 and the forty-seventh two-lane winding body 2247. As in Fig. 10(a), the forty-eighth two-track winding body 2248 is then arranged within the widened opening of the intermediate structure 21. As shown in Fig. 10(b), the forty-eighth two-lane winding body 2248 is then mounted on the forty-seventh two-lane winding body 2247. As shown in Fig. 10(c), the opening of the intermediate winding body 21A is then closed, and the first two-lane winding body 221 and the forty-eighth two-lane winding body 224B are joined together to obtain a ring-shaped armature winding 20.

[0047] As in Fig. As shown in Figure 11, the armature winding 20 assembled in this manner is configured by arranging forty-eight two-lane winding bodies 22 circumferentially at a pitch of one slot. Eight first to fourth rectilinear portions 22a, 22b, 22c, and 22d are radially arrayed in a single column, and forty-eight such rows are circumferentially arranged at a pitch of one slot. The first coil end portions 22e and the third coil end portions 22g are circumferentially arranged to form first coil ends, and the second coil end portions 22f are circumferentially arranged to form second coil ends.

[0048] The winding ends 221h and 222h constituting the winding ends 22h each protrude axially outward near the second coil ends and are arranged on a radially outer side of the second coil ends at a distance of one slot in the circumferential direction, and the winding ends 221j and 222j constituting the winding ends 22j each protrude axially outward near the second coil ends and are arranged on a radially inner side of the second coil ends at a distance of one slot in the circumferential direction.

[0049] Insulators 14 formed to have an angular C shape are then mounted on each of the columns of the first to fourth rectilinear portions 22a, 22b, 22c, and 22d of the armature winding 20 from radially outside. As shown in Fig. 12, twenty-four core blocks 12 are then arranged radially outside the armature winding 20 so that the teeth 12b are arranged on a radially outer side between the rows of the first to fourth rectilinear portions 22a, 22b, 22c and 22d.

[0050] Thereafter, each of the core blocks 12 is moved radially inward to insert the teeth 12b between the gaps of the first to fourth straight portions 22a, 22b, 22c, and 22d. As shown in Fig. As shown in Figure 13, the side surfaces of the rear core portions 12a of the circumferentially adjacent core blocks 12 abut each other to form the annular armature core 11. The armature winding 20 is simultaneously mounted on the armature core 11. An AC connection is then applied to the armature winding 20 to form the armature 10.

[0051] In Embodiment 1, since the armature winding 20 can be manufactured by assembling the forty-eight two-lane winding bodies 22 in the circumferential direction in this way, the complicated step of weaving wave-wound coils in Patent Literature 3 using wave-wound coils is no longer necessary, which increases productivity.

[0052] The two-track winding bodies 22 are formed by layering and winding the flat conductor wires 19. The radial positions of the winding ends 221h and 221j of the radially outer winding body 221 and the winding ends 222h and 222j of the radially inner winding body 222 are different. Since the two-track winding bodies 22 can be arranged at a distance of one slot without interference between the winding ends 221h and the winding ends 222h, and without interference between the winding ends 221j and the winding ends 222j, an increase in the radial dimensions of the second coil ends is prevented.

[0053] In addition, since the end portions of the coil ends 221h and 222h can be arranged together, and since the end portions of the coil ends 221j and 222j can be arranged together so as to be layered in the radial direction, the connecting operations are simplified, and the connecting portions can also be reduced in size.

[0054] In addition, the bending radius at the apex portions of the first to third coil end portions 22e, 22f, and 22g is reduced compared to Patent Literature 1 using hexagonal coils, which enables the radial dimensions and the axial dimensions of the first and second coil ends to be reduced.

[0055] The winding ends 221h and 222h for connecting the radially outer winding bodies 221 and the radially inner winding bodies 222 are arranged circumferentially around a radially outer side of the first coil ends, and the winding ends 221j and 222j are arranged circumferentially around a radially inner side of the first coil ends. Consequently, since crossover wires leading the first coil ends axially outward are no longer required, the axial dimensions of the armature 10 can be reduced, and a reduction in winding resistance can also be achieved, compared with Patent Literature 1.

[0056] Since the number of welding spots in the armature winding 20 is reduced compared to Patent Literature 2 which uses coil segments, the cycle time during production can be shortened, and the occurrence of quality problems can also be prevented.

[0057] Hereinafter, a method for connecting the armature winding 20 will be described with reference to the Fig. 14 to 19 described. Fig. 14 is a diagram explaining a method of connecting a U-phase coil of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention, Fig. 15 is an oblique projection showing the U-phase coil of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention, Fig. 16 is a diagram explaining the method of connecting the U-phase coil of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention.

[0058] Fig. 17 is a diagram explaining a method of connecting a V-phase coil of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention, Fig. 18 is a partial oblique projection showing the vicinity of electric power supply portions of the U-phase coil of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention, and Fig. 19 is a partial oblique projection showing the vicinity of electric power supply portions of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention.

[0059] In Fig. 14, U11a1, U12a1, U13a1, etc. to U18a1 and U11b1, U12b1, U13b1, etc. to U18b1 are the winding ends 221h and 221i of outer winding bodies 221 of two-lane winding bodies 22, which form a U1 phase, which is mounted in a first group of slots 13, the slots 13 having the slot numbers (1 + 6n), where n is an integer from 0 to 7, and U21a1, U22a1, U23a1, etc., to U28a1 and U21b1, U22b1, U23b1, etc. to U28b1 are winding ends 222h and 222i of inner winding bodies 222 of the two-lane winding bodies 22 forming a U1 phase mounted in the first group of slots 13 having slots at slot numbers (1 + 6n), where n is an integer from 0 to 7.

[0060] In Fig. 14, U11a2, U12a2, U13a2 etc. to U18a2 and U11b2, U12b2, U13b2 etc. to U18b2 are winding ends 221h and 221i of outer winding bodies 221 of two-lane winding bodies 22, which form a U2 phase, which is mounted in a first group of slots 13, which has slots 13 at the slot numbers (2 + 6n), where n is an integer from 0 to 7, and U21a2, U22a2, U23a2 etc. to U28a2 and U21b2, U22b2, U23b2 etc. to U28b2 are winding ends 222h and 222i of inner winding bodies 222 of the two-lane winding bodies 22, which form a U2 phase, which is mounted in the second group of slots 13, which has slots 13 at the slot numbers (2 + 6n), where n is an integer number from 0 to 7.

[0061] Two-track winding bodies 22 are also mounted in a third slot group containing slots 13 at slot numbers (3 + 6n) to form a V1 phase, and two-track winding bodies 22 are mounted in a fourth slot group containing slots 13 at slot numbers (4 + 6n) to form a V2 phase. Two-track winding bodies 22 are also mounted in a fifth slot group containing slots 13 at slot numbers (5 + 6n) to form a W1 phase, and two-track winding bodies 22 are mounted in a sixth slot group containing slots 13 at slot numbers (6 + 6n) to form a W2 phase.

[0062] As in the Fig. 14 and Fig. As shown in Figure 15, U11b1 is first connected to U22b1, U22a1 to U13a1, U13b1 to U24b1, U24a1 to U15a1, U15b1 to U26b1, U26a1 and U17a1, and U17b1 to U28b1 to form a winding group U101. Similarly, U12b1 is connected to U23b1, U23a1 to U14a1, U14b1 to U25b1, U25a1 to U16a1, U16b1 to U27b1, U27a1 to U18a1, and U18b1 to U21b1 to form a winding group U102. The winding groups U101 and U102 are respectively configured by alternately connecting in series radially outer winding bodies 221 and radially inner winding bodies 222 spaced by 180° (electrical degrees) among the two-lane winding bodies 22 mounted in the first slot group, ie, sharing slots 13.

[0063] Next, U11b2 is connected to U22b2, U22a2 to U13a2, U13b2 to U24b2, U24a2 to U15a2, U15b2 to U26b2, U26a2 to U17a2, and U17b2 to U28b2 to form winding group U201. Similarly, U12b2 is connected to U23b2, U23a2 to U14a2, U14b2 to U25b2, U25a2 to U16a2, U16b2 to U27b2, U27a2 to U18a2, and U18b2 to U21b2 to form winding group U202.

[0064] The winding groups U201 and U202 are respectively configured by alternately connecting in series radially outer winding bodies 221 and radially inner winding bodies 222 spaced by 180° (electrical degrees) among the two-lane winding bodies 22 mounted in the second slot group, ie, sharing slots 13.

[0065] As in Fig. 16, U21a1 is then connected to U28a1, U11a2 is connected to U12a2, and U12a1 is connected to U21a2 to obtain a U-phase coil in which the four winding groups U101, U102, U201, and U202 are connected in series. As shown in Fig. 18, U21a1 and U28a1 and U11a2 and U12a2 are spaced apart in the circumferential direction and are connected using busbars U13 and U14, respectively.

[0066] Since U12a1 and U21a2 are routed outward to a position closest to the circumferential direction, they are directly connected. U11a1 becomes the electrical power supply area of the U-phase coil, and U28a2 becomes the neutral point of the U-phase coil. Busbars U13 and U14 are manufactured by bending a metal sheet and applying an insulating surface coating, but the conductor wire 19 forming the two-track winding bodies 22 can also be used.

[0067] Although not specifically shown, a W-phase coil is also configured by connecting two-lane winding bodies 22 mounted in the fifth slot group and the sixth slot group in a similar manner as the U-phase coil.

[0068] As in Fig. As shown in Figure 17, two-lane winding bodies 22 mounted in the third slot group and the fourth slot group are connected so that V12a1 becomes an electric power supply portion of a V-phase coil, and V21a2 becomes its neutral point. Furthermore, V13 and V14 are busbars connecting V21a1 to W28a1 and W11a2 to W12a2, and W13 and W14 are busbars connecting W21a1 to W28a1 and W11a2 to W12a2.

[0069] When a connection structure of this type is used, the electric power supply areas and the neutral points of the U-phase coil, the V-phase coil and the W-phase coil can be concentrated in a narrow circumferential area, as shown in Fig. 19 shown.

[0070] Hereinafter, the insulation of the coil ends in the armature winding 20 configured in this way will be described with reference to the Fig. 20 to 22 described. Fig. 20 is a partial end view showing second coil ends of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention, Fig. 21 is a partial end view schematically showing second coil ends of the armature winding in the rotary electric machine according to Embodiment 1 of the present invention, and Fig. 22 is a partial end view schematically showing second coil ends of a conventional armature winding.

[0071] As in Fig. 20, in this armature winding 20, the first coil end portions 22e and the third coil end portions 22g are arranged in the circumferential direction to form first coil ends. In other words, in the first coil ends of the armature winding 20, as shown in Fig. 21, the trajectory of two conductor wires 19 exited from the third layer and the fourth layer from a radially outer side of a first groove is changed by 2d radially outward by the offset portions 22k, and they are inserted into the first layer and the second layer from a radially outer side of a groove spaced from the first groove by an angular pitch of six grooves in a first circumferential direction, and the trajectory of two conductor wires 19 exited from the fifth layer and the sixth layer from a radially outer side of the first groove is changed by 2d radially inward by the offset portions 22k, and they are inserted into the seventh layer and the eighth layer from a radially outer side of a groove spaced from the first groove by an angular pitch of six grooves in a second circumferential direction.

[0072] Consequently, in the second coil ends, there are two contact areas between coils having different phases, ie between the conductor wires 19 in the second layer and the conductor wires 19 in the third layer, and between the conductor wires 19 in the sixth layer and the conductor wires 19 in the seventh layer.

[0073] In contrast, in the case of distributed windings using wave windings or U-shaped coil segments as in Fig. 22, different phase coils are in contact between the conductor wires in all layers.

[0074] Therefore, according to Embodiment 1, since the two-lane winding bodies 22 are configured such that the conductor wires 19 are wound to cyclically pass through three consecutive slots 13 so as to be spaced at an angular pitch of six slots in the circumferential direction, the positions at which different-phase coils are in contact with the coil ends are reduced, making it possible to suppress the risk of dielectric breakdown occurring when high voltages are applied.

[0075] The radially outer winding bodies 221 and the radially inner winding bodies 222, which are spaced by 180° (electrical degrees), are alternately connected in series, and the three sets of radially outer winding bodies 221 and radially inner winding bodies 222, which are inserted into identical slots 13, are sequentially connected.

[0076] Since the electric potential difference between the conductor wires 19 inserted into the identical slots 13 is at most half the phase voltage, the insulating capacity required for the conductor wires 19 is reduced, and it is not necessary to excessively increase the layer thickness of the insulating coating on the conductor wires 19.

[0077] Since conductor wires having a rectangular cross section are used as the conductor wires 19, the space factor is increased. Embodiment 2

[0078] Fig. 23 is an end view schematically showing a two-lane winding body forming part of an armature winding in a rotary electric machine according to Embodiment 2 of the present invention. In addition, coil end portions are shown in Fig. 23 shown with solid lines.

[0079] In Fig. 23, a two-lane winding body 22A is manufactured in a coil pattern, wherein two conductor wires 19 are wound edgewise so as to be layered in the short side direction, and in a third slot, a first slot and a second slot which are sequentially lined up in the circumferential direction so as to be spaced at an angular pitch of six slots, are sequentially inserted into the first slot, the second slot, the first slot, the third slot, the first slot and the second slot.

[0080] Moreover, the remaining configuration is formed in a similar or the same manner as that of the above Embodiment 1, except that the two-lane winding body 22A is used instead of the two-lane winding body 22.

[0081] In Embodiment 2, two-lane winding bodies 22A are used, which are manufactured by winding two layered conductor wires 19 into a coil pattern similar to or identical to that of the two-lane winding bodies 22, and then proceeding to wind them into a coil pattern inserted into the first slot and the second slot.

[0082] Accordingly, similar or identical effects to those in the above Embodiment 1 are also exhibited in the Embodiment 2.

[0083] Then, the two-lane winding bodies 22A are manufactured by winding two layered conductor wires into a first coil pattern, which is sequentially inserted into the first slot and the second slot, and then iterating a second coil pattern once, sequentially inserting them into the first slot, the third slot, the first slot, and the second slot. However, the number of iterations of the second coil pattern may alternatively be two or more. In other words, if two-lane winding bodies are used in which the number of iterations of the second coil pattern is m times, where m is an integer greater than or equal to 1, then an armature winding in which the number of rectilinear regions radially arranged in individual columns is (4 + 8m) can be easily manufactured. Embodiment 3

[0084] Fig. 24 is an end view schematically showing a two-lane winding body forming part of an armature winding in a rotary electric machine according to Embodiment 3 of the present invention. In addition, coil end portions are shown in Fig. 24 shown with solid lines.

[0085] In Fig. 24, a two-lane winding body 22B is manufactured in a coil pattern, wherein two conductor wires 19 are wound edgewise so as to be layered in the short side direction, and in a third slot, a first slot and a second slot which are sequentially lined up in the circumferential direction so as to be spaced at an angular pitch of six slots, are sequentially inserted into the first slot, the second slot, the first slot, the third slot, the first slot, the second slot, the first slot and the third slot.

[0086] Moreover, the remaining configuration is formed in a similar or the same manner as that of the above Embodiment 1, except that the two-lane winding body 22B is used instead of the two-lane winding body 22.

[0087] In Embodiment 2, two-lane winding bodies 22B are used, which are formed by winding two layered conductor wires 19 into a coil pattern similar to or identical to that of the two-lane winding bodies 22, and then continuing to wind them into a coil pattern inserted into the first slot, the second slot, the first slot, and the third slot. Accordingly, similar or identical effects to those in Embodiment 1 above are also exhibited in Embodiment 3.

[0088] Now, in the two-lane winding bodies 22 and 22B, the number of iterations of the coil pattern in which two layered conductor wires are sequentially inserted into the first slot, the second slot, the first slot, and the third slot is one or two iterations, but the number of iterations of the respective coil pattern may alternatively be three or more. In other words, if two-lane winding bodies are used in which the number of iterations of the coil pattern is m times, then an armature winding in which the number of rectilinear regions radially arranged in individual columns is 8m can be easily manufactured. Embodiment 4

[0089] Fig. 25 is a diagram explaining a method of connecting a U-phase coil of an armature winding in a rotary electric machine according to Embodiment 4 of the present invention, Fig. 26 is a partial oblique projection showing the vicinity of electric power supply portions of the U-phase coil of the armature winding in the rotary electric machine according to Embodiment 4 of the present invention, and Fig. 27 is a partial oblique projection showing the vicinity of electric power supply portions of the armature winding in the rotary electric machine according to Embodiment 4 of the present invention.

[0090] In embodiment 4, as in Fig. 14, winding groups U101 and U102 are manufactured by alternately connecting in series radially outer winding bodies 221 and radially inner winding bodies 222, spaced 180° (electrical degrees) apart, among two-lane winding bodies 22 mounted in a first slot group, i.e., sharing slots. Winding groups U201 and U202 are manufactured by alternately connecting in series radially outer winding bodies 221 and radially inner winding bodies 222, spaced 180° (electrical degrees) apart, among the two-lane winding bodies 22 mounted in a second slot group, i.e., sharing slots.

[0091] As in Fig. 25 and Fig. As shown in Figure 26, U12a1 and U21a2 are directly connected, U11a1 and U28a2 are directly connected, and U11a2 and U12a2 are directly connected using a busbar U13 to obtain a U-phase coil, with the winding groups U101, U201, U202, and U102 connected in series. U28a1 becomes an electric power supply section, and U21a1 becomes a neutral point. In addition, a V-phase coil and a W-phase coil are also formed in a similar or identical manner.

[0092] In Embodiment 4, half of the radially outer winding bodies 221 and the radially inner winding bodies 222 mounted in the first slot group are connected in series to configure the winding group U101, which is arranged near the electric power supply region of the U-phase coil, and the remaining half of the radially outer winding bodies 221 and the radially inner winding bodies 222 mounted in the first slot group are connected in series to configure the winding group U102, which is arranged near the neutral point of the U-phase coil.

[0093] In this embodiment, half of the radially outer winding bodies 221 and the radially inner winding bodies 222 mounted in the second slot group are connected in series to configure the winding group U201, which is arranged near the electric power supply region of the U-phase coil, and the remaining half of the radially outer winding bodies 221 and the radially inner winding bodies 222 mounted in the second slot group are connected in series to configure the winding group U202, which is arranged near the neutral point of the U-phase coil.

[0094] Since the winding groups U101, U102, U201 and U202 are configured by connecting winding bodies in series which share slots such that half are distributed between the side of an electric power supply area and one side of a neutral point in this way, the number of busbars U13, V13 and W13 can be reduced to three as shown in Fig. 27. This allows the number of parts to be reduced, and it also allows reductions in the size of an armature 10A to be achieved. Embodiment 5

[0095] Fig. 28 is a diagram explaining a method of connecting a U-phase coil of an armature winding in a rotary electric machine according to Embodiment 5 of the present invention, and Fig. 29 is an oblique projection showing an armature in the rotary electric machine according to Embodiment 5 of the present invention.

[0096] In embodiment 5, as in Fig. 14, a winding group U101 is first manufactured by alternately connecting radially outer winding bodies 221 and radially inner winding bodies 222 in series, which are spaced by 180° (electrical degrees), under two-track winding bodies 22 mounted in a first slot group.

[0097] A winding group U201 is manufactured by alternating radially outer winding bodies 221 and radially inner winding bodies 222 in series, spaced 180° (electrical degrees), among the two-track winding bodies 22 mounted in a second slot group. Next, as shown in Fig. 28, U12a1 is connected to U21a1, U21b1 to U18b1, U18a1 to U27a1, U27b1 to U16b1, U16a1 to U25a1, U25b1 to U14b1, and U14a1 to U23a1 to form a winding group U102 having U12b1 and U23b1 as winding ends.

[0098] Similarly, U12a2 is connected to U21a2, U21b2 to U18b2, U18a2 to U27a2, U27b2 to U16b2, U16a2 to U25a2, U25b2 to U14b2, and U14a2 to U23a2 to form a winding group U202, which has U12b2 and U23b2 as the winding ends. In addition, a V-phase coil and a W-phase coil are also formed in a similar or identical manner.

[0099] According to embodiment 5, the following applies, as in Fig.As shown in Figure 29, twelve winding ends of twelve winding groups constituting the U-phase coil, the V-phase coil, and the W-phase coil are arranged to be circumferentially aligned around a radially inner side of the coil ends, and twelve second winding ends are arranged to be circumferentially aligned around a radially outer side of the coil ends. An armature 10B configured in this manner can also be used with rotary electric machines that structurally do not have additional space radially outside the armature.

[0100] Furthermore, in each of the above embodiments, the winding bodies are configured using conductor wire having an elongated cross section, but the cross-sectional shape of the conductor wire constituting the winding bodies is not limited to an elongated shape, and, for example, a conductor wire having a round cross section may be used.

[0101] In each of the above embodiments, the first to fourth rectilinear regions are arranged in a single column radially inside the grooves such that the longitudinal directions of the long sides of the elongated cross sections are aligned in the circumferential direction. However, the first to fourth rectilinear regions may also be arranged in a single column radially inside the grooves such that the longitudinal directions of the short sides of the elongated cross sections are aligned in the circumferential direction.

[0102] In each of the above embodiments, a rotary electric machine with eight poles and forty-eight slots is described. However, it should be understood that the number of poles and the number of slots are not limited to eight poles and forty-eight slots. Furthermore, the slots are formed in a ratio of two slots per phase per pole, but the number of slots per phase per pole is not limited to two, and it may also be one, or it may be three or more.

[0103] In each of the above embodiments, the armature winding is a three-phase winding, the number of slots is formed in a ratio of two slots per phase per pole, and the pitch between the straight portions of the winding bodies is set to an angular pitch of six slots. However, the pitch between the straight portions of the winding bodies is not limited to an angular pitch of six slots.

[0104] If the armature winding is a three-phase winding and the number of slots is formed in a ratio of one slot per phase per pole, then, for example, the distance between the straight-line portions of the two-track winding bodies becomes an angular distance of three slots.

[0105] In each of the above embodiments, an armature for an electric rotary machine, such as an electric motor or a generator, was described. However, similar or identical effects are also exhibited if the present invention is applied to an armature for a direct-acting machine, such as a linear motor. Furthermore, the radial direction, circumferential direction, and axial direction in an electric rotary machine correspond to a groove depth direction, groove arrangement direction, and groove longitudinal direction of a direct-acting machine.

Claims

[1] Armature for an electrical machine, the armature comprising: - an armature core (11) in which a plurality of grooves (13) are arranged in a groove width direction; and - an armature winding (20) mounted on the armature core (11), characterized by , that the armature winding (20) has a plurality of two-track first winding bodies (22, 22B), each formed from two seamless continuous conductor wires (19) coated with insulation; that the two-track first winding bodies (22, 22B) are arranged at a distance of one slot in the direction of the slot arrangement, so that the two conductor wires are mounted in a third slot (133), a first slot (131) and a second slot (132) which are sequentially arranged in the direction of the slot arrangement at an angular pitch of p slots, where p is a natural number greater than or equal to 2; that the two conductor wires (19) forming the two-track first winding bodies (22, 22B) are layered in a slot depth direction of the armature core (11); that the two-track first winding bodies (22, 22B) have a number m of a coil pattern in which the two conductor wires (19) layered in the slot depth direction are sequentially inserted into the first slot (131), the second slot (132), the first slot (131), and the third slot (133), where m is a natural number greater than or equal to 1; and that the number m of the coil pattern are lined up in the groove depth direction. [2] An armature for an electrical machine, the armature comprising: an armature core (11) in which a plurality of grooves (13) are arranged in a groove width direction; and an armature winding (20) mounted on the armature core (11), characterized by , that the armature winding (20) has a plurality of two-track second winding bodies (22A), each formed from two seamless continuous conductor wires (19) coated with insulation; that the two-track second winding bodies (22A) are arranged at a distance of one slot in the direction of the slot arrangement, so that the two conductor wires (19) are mounted in a third slot (133), a first slot (131) and a second slot (132) which are successively arranged in the direction of the slot arrangement at an angular pitch of p slots, where p is a natural number greater than or equal to 2; that the two conductor wires (19) forming the two-track second winding bodies (22A) are layered in a slot depth direction of the armature core (11); that the two-track second winding bodies (22A) have the following: -- a single first coil pattern, wherein the two conductor wires (19) layered in the groove depth direction are sequentially inserted into the first groove (131) and the second groove (132); and -- a number m of a second coil pattern in which the two conductor wires (19) layered in the groove depth direction are sequentially inserted into the first groove (131), the third groove depth direction (133), the first groove (131) and the second groove (132), where m is a natural number greater than or equal to 1; and that the number m of the second coil pattern in the slot depth direction are lined up on a first side of the single first coil pattern in the slot depth direction. [3] An armature for an electrical machine according to claim 1 or 2, wherein a radially outer winding body (221) formed from a conductor wire (19) arranged on a slot lower portion side of the two conductor wires (19) layered in the slot depth direction and a radially inner winding body (222) formed from a conductor wire (19) arranged on a slot opening side of the two conductor wires (19) layered in the slot depth direction each comprise: - rectilinear portions (22a, 22b, 22c, 22d) received in the first groove (131), the second groove (132) and the third groove (133); and - coil end regions (22e, 22f, 22g) connecting the end regions of the straight regions (22a, 22b, 22c, 22d) to each other; and wherein the coil end portions (22e, 22f, 22g) have a crank portion (22k) at an upper portion, the crank portion (22k) offsetting portions of the straight portions (22a, 22b, 22c, 22d) received in the groove depth direction in the groove depth direction within the first groove (131), the second groove (132), and the third groove (133) by twice the thickness in the groove depth direction of the straight portions (22a, 22b, 22c, 22d). [4] An armature for an electric machine according to any one of claims 1 to 3, wherein radially outer terminals (22h) and radially inner terminals (22j) of radially outer winding bodies (221) formed by conductor wires (19) arranged on the side of a lower slot portion of the two conductor wires (19) layered in the slot depth direction and radially inner winding bodies (222) formed by conductor wires (19) arranged on the side of a slot opening of the two conductor wires (19) layered in the slot depth direction are respectively extended such that the radially outer terminals (22h) are inclined in opposite directions toward the slot arrangement, and wherein the radially inner terminals (22j) are inclined in opposite directions toward the slot arrangement. [5] An armature for an electrical machine according to any one of claims 1 to 3, wherein the two-track first or second winding bodies (22, 22A, 22B) comprise: - a radially outer winding body (221) formed by a conductor wire (19) formed on a lower slot portion side of the two conductor wires (19) layered in the slot depth direction; and - a radially inner winding body (222) formed by a conductor wire (19) formed on a slot opening side of the two conductor wires (19) layered in the slot depth direction; wherein the armature winding (20) has 2n winding groups per phase, where n is the number of slots per phase per pole; and wherein each of the winding groups (U101, U102, U201, U202) is configured such that radially outer winding bodies (221) and radially inner winding bodies (222) spaced apart by 180° (electrical degrees) are connected among the radially outer winding bodies (221) and the radially inner winding bodies (222), and that half of the radially outer winding bodies (221) and the radially inner winding bodies (222) are connected one after the other, which are inserted into identical slots among the slots (13). [6] An armature for an electrical machine according to any one of claims 1 to 3, wherein the two-track first or second winding bodies (22, 22A, 22B) comprise: - a radially outer winding body (221) formed by a conductor wire (19) formed on a lower slot portion side of the two conductor wires (19) layered in the slot depth direction; and - a radially inner winding body (222) formed by a conductor wire (19) formed on a slot opening side of the two conductor wires (19) layered in the slot depth direction; wherein the armature winding (20) has 2n winding groups per phase, where n is the number of slots per phase per pole, which is greater than or equal to 2; and wherein each of the winding groups (U101, U102, U201, U202) is configured such that radially outer winding bodies (221) and radially inner winding bodies (222) spaced apart by 180° (electrical degrees) are connected among the radially outer winding bodies (221) and the radially inner winding bodies (222), and that half of the radially outer winding bodies (221) and the radially inner winding bodies (222) sharing the slots (13) are connected in series; and wherein a first terminal of the winding groups (U101, U102, U201, U202) is arranged near a lower slot region, and wherein a second terminal is arranged near a slot opening. [7] An armature for an electrical machine according to any one of claims 1 to 3, wherein the two-track first or second winding bodies (22, 22A, 22B) comprise: - a radially outer winding body (221) formed by a conductor wire (19) formed on a lower slot portion side of the two conductor wires (19) layered in the slot depth direction; and - a radially inner winding body (222) formed by a conductor wire (19) formed on a slot opening side of the two conductor wires (19) layered in the slot depth direction; wherein the armature winding (20) has 2n winding groups per phase, where n is the number of slots per phase per pole, which is greater than or equal to 2; and wherein each of the winding groups (U101, U102, U201, U202) is configured such that radially outer winding bodies (221) and radially inner winding bodies (222) spaced apart by 180° (electrical degrees) are connected among the radially outer winding bodies (221) and the radially inner winding bodies (222), and that half of the radially outer winding bodies (221) and the radially inner winding bodies (222) sharing the slots (13) are connected in series so as to be divided into a neutral point side and an electric power supply region side. [8] An armature for an electrical machine according to any one of claims 1 to 7, wherein the cross section of the conductor wire (19) is rectangular.

Images