JP2020080598A - Wave-winding coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily work without the need for weaving a coil, and to construct a wave winding coil so that a coil wire rod can freely move by itself. The wave winding is excellent in productivity and mounting in a slot of a stator core. Provision of coils.
SOLUTION: A plurality of coil wire rods 10 each having a plurality of straight portions 11 arranged in parallel and inserted into a slot 52 of a stator core 50 and a plurality of turn portions 12 connecting end portions of adjacent straight portions 11 are formed. And a first coil portion 2 that extends in the circumferential direction of the stator core 50 and a first coil that extends in the circumferential direction of the stator core 50. A second coil part 3 arranged in parallel with the part 2; The first coil portion 2 and the second coil portion 3 are folded back at the connecting portion 4 and are adjacent to each other in the radial direction within the slot 52.
[Selection diagram] Figure 2

Description

  The present invention relates to a wave winding coil.

  Conventionally, as a wave winding coil to be inserted into a slot of a stator core, there is known one in which a coil forming each phase is spirally wound and folded back at the innermost side (for example, see Patent Document 1). ..

JP, 2017-34847, A

  The above conventional wave winding coil needs to be woven when two coils formed in a wave shape are wound in a spiral shape, but a long wave winding coil in which a plurality of layers of a stator coil are continuous is produced. In doing so, for example, a step of rotating the long plate and the wave winding coil while winding the wave winding coil on the substantially rectangular parallelepiped long plate is required. However, in practice, it was difficult to complete this process without sacrificing productivity. Further, when the manufactured wave-wound coil is mounted in the slots of the stator core, the pitch between the slots changes depending on the radial position of the slots, so that a step of expanding and contracting the wave-wound coil in the longitudinal direction is required. However, in the case of a coil shape in which each coil piece cannot freely move independently like a woven wave wound coil, it is difficult to establish a process of simultaneously expanding and contracting a plurality of highly rigid rectangular wires. There was a problem.

  INDUSTRIAL APPLICABILITY According to the present invention, the productivity of wave-wound coils and the mounting of the stator core in the slots are such that it is not necessary to weave the coil, the work can be performed easily, and the coil wire material that constitutes the wave-wound coil can freely move by itself. An object is to provide a wave winding coil having excellent properties.

  (1) In the wave winding coil according to the present invention, a plurality of straight portions (for example, a straight portion 11 described later) inserted in slots (for example, a slot 52 described later) of a stator core (for example, a stator core 50 described later) in parallel. And a plurality of turn portions (for example, a turn portion 12 described below) connecting adjacent end portions (for example, an upper end portion 11a and a lower end portion 11b described later) of the adjacent straight portions, and a plurality of coil wire rods (for example, A wave winding coil (for example, a wave winding coil 1 described later) that is configured by a coil wire rod 10) described below and is spirally wound along the circumferential direction of the stator core, and extends in the circumferential direction of the stator core. A first coil portion (for example, a first coil portion 2 described later) and a second coil portion (for example, a second coil portion 3 described later) that extends in the circumferential direction of the stator core and is arranged in parallel with the first coil portion. ) And one end portion (for example, one end portion 2a described later) of the first coil portion and one end portion (for example, one end portion 3a described later) of the second coil portion are connected to each other (for example, The connecting portion 4) described later is provided, and the first coil portion and the second coil portion are folded back at the connecting portion and are adjacent to each other in the radial direction in the slot.

  According to the wave winding coil described in (1) above, since the straight portions adjacent to each other in each layer are arranged at the same position in the radial direction within the slot, there is no need for weaving, and they can be easily mounted in the slots of the stator core. Is. In addition, since the first coil portion and the second coil portion are folded back at the connecting portion, the connecting portion between the coils can be reduced. Further, since the wave winding coil is not woven, the coil wire material forming the wave winding coil can freely move by itself. Therefore, the wave winding coil is excellent in productivity and mountability in the slots of the stator core.

  (2) In the wave winding coil described in (1), the turn portion has two skewed portions (for example, a skewed portion 121 described below) and one top portion (for example, a top portion 122 described later). , One of the two oblique portions constitutes an outer portion (for example, an outer portion 121a described later) that is arranged to be offset radially outward of the stator core with respect to the straight portion, and The other of the two skewed portions constitutes an inner portion (for example, an inner portion 121b described later) that is arranged offset inward in the radial direction of the stator core with respect to the straight portion, and the plurality of coil wire members are The outer portions and the inner portions of the turn portion may be overlapped with each other while being displaced in the circumferential direction of the stator core.

  According to the wave winding coil described in (2) above, since the turn portions of the coil wire do not interfere with each other, the radial thickness can be suppressed.

  (3) In the wave winding coil according to (1) or (2), the connecting portion may have the one end of the second coil portion with respect to the one end of the first coil portion, and the stator core. May be coupled to the other end portion (for example, the other end portion 2b described later) of the first coil portion while being displaced in the circumferential direction.

  According to the wave winding coil described in (3) above, the coil end portions arranged at the other end portions of the first coil portion and the second coil portion are displaced from each other in the circumferential direction of the stator core. It is possible to easily connect the first coil portion and the second coil portion using the coil terminal portion.

  (4) In the wave winding coil described in (3), the connecting portion may be arranged on the outermost peripheral side in the wound state.

  According to the wave winding coil described in (4) above, after first inserting the connecting portion into the slot of the stator core, the coils can be inserted into the slots of the stator core one by one. Furthermore, since the coil shape is not woven, the coils can be expanded and contracted one by one, and the expansion and contraction of the diameter when inserting the coil can be dealt with.

  (5) In the wave winding coil described in (4), the first coil portion may form an odd layer and the second coil portion may form an even layer.

  According to the wave-wound coil described in (5) above, the turn parts of the second coil parts arranged in different layers with the first coil part interposed therebetween do not interfere with each other in the wound connection part. The radial thickness of the connecting portion can be suppressed.

  (6) In the wave winding coil described in (3), the connecting portion may be arranged on the innermost circumference side in the wound state.

  According to the wave winding coil described in (6) above, since the coil end portions of the first coil portion and the second coil portion are arranged on the outer peripheral side of the stator core, the first coil portion and the first coil portion utilizing the coil end portion are provided. It is possible to connect the two coil portions more easily.

  (7) In the wave winding coil described in (6), the first coil portion may form an even layer and the second coil portion may form an odd layer.

  According to the wave winding coil described in (7) above, the turn parts of the second coil parts arranged in different layers with the first coil part interposed therebetween do not interfere with each other in the wound connection part. The radial thickness of the connecting portion can be suppressed.

  (8) A wave winding coil according to the present invention includes a first wave winding coil (for example, a first wave winding coil 1A described later) and a second wave winding coil which are the wave winding coils according to any one of (1) to (3). The first wave winding coil has a wave winding coil (for example, a second wave winding coil 1B described later), and the first wave winding coil has the connecting portion (for example, a connecting portion 4A described later) arranged on the outermost peripheral side in a wound state. The second wave winding coil is arranged on the innermost peripheral side in the winding state of the connecting portion (for example, a connecting portion 4B described later), and the other one of the first wave winding coil and the second wave winding coil. The end portions (for example, the other end portions 2b and 3b described later) are arranged to face each other along the circumferential direction of the stator core (for example, the stator core 50 described later), and the second wave winding coil is the first coil. It is arranged on the inner peripheral side of the one-wave winding coil.

  According to the wave winding coil described in (8) above, the first coil portion and the second coil portion of the wave winding coil mounted on the stator core are the first wave winding coil and the second wave winding coil. Since the structure is divided into two, separate circuit connection can be performed for the first wave winding coil and the second wave winding coil, and the degree of freedom in circuit connection of the wave winding coil is improved. Further, when the wave winding coil is mounted in the slot of the stator core, it is necessary to expand and contract in the longitudinal direction of the wave winding coil, but the expansion and contraction allowance of the coil of the layer on the outer diameter side becomes particularly large. By providing the connecting portion on the outer diameter side, the productivity of the coil can be improved at the same time by improving the mountability of the wave winding coil and dividing the long coil into two parts.

  (9) In the wave winding coil according to (8), the first coil portion of the first wave winding coil constitutes an odd layer, and the second coil portion of the first wave winding coil constitutes an even layer. However, the first coil portion of the second wave winding coil may form an even numbered layer, and the second coil portion of the second wave winding coil may form an odd numbered layer.

  According to the wave winding coil described in (9) above, the first coil portion and the second wave winding coil are arranged in different layers with the respective first coil portions being sandwiched between the respective connection portions in the wound state. Since the turn parts of the second coil part do not interfere with each other, the radial thickness of each connecting part of the first wave winding coil and the second wave winding coil can be suppressed.

  (10) In the wave winding coil according to any one of (1) to (9), the first coil portion and the second coil portion are arranged in the connecting portion in a direction orthogonal to a direction in which the straight portions are arranged. It may be folded back.

  According to the wave-wound coil described in (10) above, the wave-wound coil before being spirally wound can be formed into a sheet shape on one plane, so that the wave-wound coil having a plurality of layers can be easily formed. Can be molded.

  According to the present invention, there is no need to weave a coil, the work can be easily performed, and the coil wire rod that constitutes the wave winding coil can freely move by itself. It is possible to provide a wave winding coil having excellent wearability.

It is a top view showing an example of a stator core in which a wave winding coil concerning the present invention is inserted. It is a front view which shows the state which expanded the wave winding coil which concerns on the 1st Embodiment of this invention on one plane. FIG. 3 is a partially enlarged view of the wave winding coil shown in FIG. 2. It is a partially expanded view of one coil wire of the wave winding coil shown in FIG. It is a top view of the coil wire shown in FIG. It is an equivalent diagram which shows the 1st usage pattern of the wave winding coil which concerns on 1st Embodiment. It is a figure which shows typically the state which wound the wave winding coil which concerns on 1st use form in the spiral shape. It is a perspective view showing the state where the wave winding coil concerning the 1st usage pattern was attached to the stator core. It is a top view showing the arrangement state of the straight part of each phase in the slot in the wave winding coil concerning the 1st usage pattern. It is an equivalent diagram which shows the 2nd usage form of the wave winding coil which concerns on the 1st Embodiment of this invention. It is a figure which shows typically the state which wound the wave winding coil which concerns on 2nd use form in the spiral shape. It is a front view which shows the state which expanded the wave winding coil which concerns on the 2nd Embodiment of this invention on one plane. It is an equivalent figure which shows the wave winding coil which concerns on 2nd Embodiment. It is a figure which shows typically the state which wound the wave winding coil which concerns on 2nd Embodiment in the spiral shape. FIG. 9 is a plan view showing an example of an arrangement state of straight portions of each phase in a slot in the wave winding coil according to the second embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Stator core]
First, an embodiment of a stator core in which the wave winding coil according to the present invention is inserted will be described with reference to FIG. FIG. 1 is a plan view showing an example of a stator core into which a wave winding coil according to the present invention is inserted.
The stator core 50 is formed in a hexagonal column shape having a circular shaft hole 51 in the center. On the inner peripheral side of the shaft hole 51, a plurality of slots 52 for mounting the later-described wave winding coil 1 are radially arranged at equal intervals along the circumferential direction of the stator core 50 (direction along the D1 direction). Each slot 52 penetrates the stator core 50 in the axial direction (the direction perpendicular to the paper surface of FIG. 1). In addition, each slot 52 has a groove-like shape that is recessed from an opening 521 opened to the axial hole 51 on the inner side in the radial direction (direction along the D2 direction) to a bottom portion 522 arranged on the outer side in the radial direction. Has been formed. The stator core 50 includes 72 slots 52, and the wave winding coil 1 described below is inserted into each slot 52 to form a 72-slot stator.

[First Embodiment]
Next, a first embodiment of the wave winding coil will be described with reference to FIGS. 2 and 3. FIG. 2 is a front view showing a state in which the wave winding coil according to the first embodiment of the present invention is developed on one plane. FIG. 3 is a partially enlarged view of the wave winding coil shown in FIG.
The wave winding coil 1 according to the present embodiment has a first coil portion 2 and a second coil portion 3 as shown in FIG. The first coil portion 2 and the second coil portion 3 are arranged in parallel on the upper and lower sides in the drawing in a state of being developed on one plane, and each extend long along the direction D1 in the drawing. . The D1 direction corresponds to the circumferential direction of the stator core 50.

  One end portion of the first coil portion 2 (the left end portion of the upper first coil portion 2 in FIG. 2) 2a and one end portion of the second coil portion 3 arranged on the same side as the one end portion 2a (see FIG. The left end portion 3a of the second coil portion 3 on the upper side in 2 is integrally connected by a connecting portion 4. Further, the other end portion (the right end portion of the lower first coil portion 2 in FIG. 2) 2b of the first coil portion 2 and the other end portion of the second coil portion 3 arranged on the same side as the other end portion 2b. The portion (the right end portion of the lower second coil portion 3 in FIG. 2) 3b serves as coil terminal portions 16 and 17 electrically connected to a drive circuit (not shown). The right end portions of the upper first coil portion 2 and the second coil portion 3 of the wave winding coil 1 shown in FIG. 2 and the left end portions of the lower first coil portion 2 and the second coil portion 3 respectively. And are continuous without interruption.

  As shown in FIG. 3, the wave winding coil 1 is composed of a plurality of coil wire rods 10. One coil wire 10 corresponds to one phase of the stator. The wave winding coil 1 according to the present embodiment is a three-phase six-coil coil corresponding to two U phases of U1 and U2, two V phases of V1 and V2, and two W phases of W1 and W2. It is composed of the wire rod 10. One coil wire 10 extends continuously across the first coil portion 2 and the second coil portion 3.

Since the six coil wire rods 10 have the same corrugated shape, one coil wire rod 10 will be described with reference to FIG. 4. FIG. 4 is a partially enlarged view of one coil wire of the wave winding coil shown in FIG.
The coil wire rod 10 is formed of a rectangular wire including a conductor having a rectangular cross section such as copper or aluminum and an insulating coating covering the outer surface of the conductor. The coil wire rod 10 includes a plurality of straight portions 11 arranged in parallel along the circumferential direction (D1 direction) of the stator core 50 at predetermined intervals, and the upper end portions 11a, 11a of the adjacent straight portions 11, 11 or And a plurality of turn portions 12 that connect the lower end portions 11b and 11b to each other in a mountain shape, and are formed in a wavy shape that is long in the circumferential direction of the stator core 50.

  The straight portion 11 is a portion that is inserted into the slot 52 of the stator core 50, and is formed to be the same as or slightly longer than the axial length of the slot 52. One coil wire rod 10 shown in the present embodiment has 48 straight wires 11 each for the first coil portion 2 and the second coil portion 3, for a total of 96 straight portions 11. The straight portions 11 in one coil wire rod 10 are arranged in parallel at intervals of 5 slots between the straight portions 11 adjacent to each other in the D1 direction. In the first coil portion 2 and the second coil portion 3 of the coil wire rod 12, twelve straight portions 11 that are adjacent to each other correspond to one revolution of the stator core 50. Therefore, the first coil portion 2 and the second coil portion 3 of the coil wire rod 10 according to the present embodiment have the straight portions 11 for each four turns of the stator core 50.

  As shown in FIG. 4, all the straight portions 11 of the coil wire rod 10 are arranged on the same plane in a developed state where the first coil portion 2 and the second coil portion 3 are not folded back at the connecting portion 4. Is formed.

  The turn portion 12 is a portion that connects adjacent straight portions 11, 11 of the coil wire rod 10 in a mountain shape on both outer sides in the axial direction of the stator core 50 to form a coil end. Specifically, the turn part 12 alternately connects the upper ends 11a, 11a of the adjacent straight parts 11, 11 of the coil wire 10 or the lower ends 11b, 11b of the coil wires 10 along the circumferential direction of the stator core 50.

  The turn part 12 has two oblique parts 121, 121 and one top part 122. One end of the oblique portion 121 is integrally connected to the upper end 11a or the lower end 11b of the straight portion 11. The two oblique portions 121, 121 forming one turn portion 12 extend obliquely upward or obliquely downward in a direction approaching each other from a connecting portion with the straight portions 11, 11. The top portion 122 is formed by integrally connecting the other ends of the two oblique portions 121, 121.

Here, the offset of the two skewed portions 121, 121 in the turn portion 12 will be further described with reference to FIG. FIG. 5 is a plan view of the coil wire rod shown in FIG.
In the unfolded wave winding coil 1, one of the two oblique portions 121, 121 of each turn portion 12 has a width X/half the line width X of the coil wire rod 10 with respect to the position of the straight portion 11. The outer portion 121a is arranged to be offset by one side (in the present embodiment, the back side of the paper surface of FIG. 4) corresponding to the radial direction of the stator core 50 (direction along the D2 direction, vertical direction of the paper surface of FIG. 4). To do. Similarly, the other of the two skewed portions 121, 121 of each turn portion 12 has a diameter of the stator core 50 that is half the line width X of the coil wire 10 by a width X/2 with respect to the position of the straight portion 11. The inside portion 121b is arranged offset to the other side (in this embodiment, the front side of the paper surface of FIG. 4) corresponding to the direction.

  Specifically, one outer side portion 121a of each turn portion 12 is displaced by X/2 to one side (back side in the drawing of FIG. 4) with respect to the straight portion 11 at the connection portion with the straight portion 11 (+X). /2), and then extends in an inclined shape toward the top 122. The other inner portion 121b is displaced by 1X (-1X) toward the other side (front side of the paper surface of FIG. 4) with respect to the outer portion 121a at the top portion 122, and then extends in an inclined shape toward the adjacent straight portion 11. At the connecting portion with the straight portion 11, the stator core 50 is again displaced radially outward by X/2 (+X/2).

  Therefore, the total radial displacement of the coil wire 10 from one straight portion 11 to the adjacent straight portion 11 via the outer portion 121a, the top portion 122, and the inner portion 121b is (+X/2)+(-1X). )+(+X/2)=0, and as shown in FIG. 3, the straight portions 11 of the coil wire rod 10 in which six pieces are arranged side by side are arranged at the same radial position in the slot 52. That is, even if the six coil wire rods 10 are arranged side by side to form one layer, the portion of the straight portion 11 has only the width of the line width X of the coil wire rod 10. The line width X is the thickness of the coil wire 10 along the radial direction of the stator core 50 (the direction perpendicular to the plane of FIG. 4, the direction D2 in FIG. 5). 5 shows only the first coil portion 2 of the coil wire rod 10 shown in FIG. 4, the skewed portions 121, 121 of the turn portion 12 in the second coil portion 3 are also offset similarly.

  As shown in FIG. 4, in one coil wire rod 10, the outer portion 121 a of the first coil portion 2 has a top portion 122 of the two skewed portions 121, 121 forming the turn portion 12 as a boundary. Direction (the right side in the drawing), the inner portion 121b of the first coil portion 2 is disposed in the opposite direction (left side in the drawing) to the D1 direction with the top 122 as a boundary. It is composed of 121. On the other hand, the outer portion 121a of the second coil portion 3 is arranged diagonally in the direction opposite to the D1 direction (left side in the drawing) of the two skewed portions 121, 121 forming the turn portion 12 with the top 122 as a boundary. The inside portion 121b of the second coil portion 3 is formed by the row portion 121, and the inside portion 121b of the second coil portion 3 is formed by the oblique portion 121 arranged in the D1 direction (right side in the drawing) with the top portion 122 as a boundary. Therefore, when each turn portion 12 of the coil wire 10 is viewed along the direction D1, the outer portion 121a and the inner portion 121b are alternately arranged in both the first coil portion 2 and the second coil portion 3.

  The connecting portion 4 includes a first connecting wire 13 provided at a portion corresponding to the one end 2a of the first coil portion 2 and a second connecting wire provided at a portion corresponding to the one end 3a of the second coil portion 3. 14 and. The first connecting line 13 is inclined from the lower end 11b of the straight portion 11 arranged at the end closest to the connecting portion 4 in the first coil portion 2 toward the second coil portion 3 (see FIGS. 2 and 3). Diagonally downward to the right). On the other hand, the second connecting wire 14 is inclined toward the first coil portion 2 from the upper end portion 11a of the straight portion 11 arranged at the end portion of the second coil portion 3 closest to the connecting portion 4 (see FIG. 2 and It extends diagonally upward to the left in FIG. 3. The inclination direction and the inclination angle of the first connecting line 13 and the second connecting line 14 are substantially the same. The inclination angles of the first connection line 13 and the second connection line 14 are substantially the same as the inclination angle of the one skew portion 121 in which the turn portions 12 have substantially the same inclination direction.

  Accordingly, the connecting portion 4 causes the one end portion 3a of the second coil portion 3 with respect to the one end portion 2a of the first coil portion 2 along the D1 direction corresponding to the circumferential direction of the stator core 50. The second end 2b (see FIG. 2) side of 2 is shifted and connected. Specifically, the straight portion 11 of the first coil portion 2 connected to the first connecting wire 13 and the straight portion 11 of the second coil portion 3 connected to the second connecting wire 14 are Six slots are displaced in the arrangement direction (D1 direction). Therefore, the straight portion 11 that is connected to the second connecting wire 14 of the connecting portion 4 in the second coil portion 3 is 1 of the straight portion 11 that is connected to the first connecting wire 13 of the connecting portion 4 in the first coil portion 2. It is arranged at the same position as the straight portion 11 adjacent to the right side along the direction D1.

  The ends of the first connecting line 13 and the second connecting line 14 are integrally connected by a third connecting line 15. The third connecting line 15 is arranged in parallel with the straight portion 11, but is much shorter than the straight portion 11. The first connecting line 13, the second connecting line 14, and the third connecting line 15 are integrated to form the straight portion 11 in the same manner as the inner portion 121b of the oblique portion 121 in the turn portion 12 of the first coil portion 2. The position is offset by X/2 on the other side (the front side of the paper surface in FIG. 4) corresponding to the radial direction of the stator core 50.

  The wave winding coil 1 in the unfolded state in which the first coil portion 2 and the second coil portion 3 are not folded back at the connecting portion 4 includes six coil wire rods 10 having the same structure as the back side of the paper in FIGS. 2 and 3. It is composed by sequentially overlapping without knitting from the front to the front side. Specifically, the six coil wire rods 10 are aligned at the same position in the axial direction (direction along the D3 direction) of the stator core 50 and are shifted by one slot in the circumferential direction of the stator core 50 (D1 direction). ing. That is, the six coil wire rods 10 are overlapped with each other while shifting the outer portions 121a and the inner portions 121b of the turn portion 12 in the circumferential direction (D1 direction) of the stator core 50.

  As a result, as shown in FIG. 3, the six coil wire rods 10 are stacked so that the outer portion 121a and the inner portion 121b of the oblique portion 121 that are offset in the opposite direction in each turn portion 12 intersect. .. At this time, the outer portions 121a and the inner portions 121b of each turn portion 12 are arranged at the same radial position. Therefore, the turn portions 12 do not interfere with each other, and the radial thickness is suppressed.

  The wave winding coil 1 in the expanded state is folded along the line A shown in FIG. 3 in a state where the six coil wire rods 10 are stacked. Specifically, the third connecting line 15 of the connecting portion 4 is bent in a direction (direction along the D3 direction) orthogonal to the line direction (D1 direction) of the straight portions 11 with the line A as a boundary. As a result, the wave winding coil 1 before being mounted on the stator core 50 has a two-layer structure in which the first coil portion 2 and the second coil portion 3 are folded at the connecting portion 4. The straight portion 11 of the first coil portion 2 and the straight portion 11 of the second coil portion 3 that have been folded back overlap each other at the same position with one offset. The first connecting line 13 and the second connecting line 14 are mountain-shaped by being folded back at the connecting part 4, and form a new turn part. The third connecting line 15 becomes the top of the newly formed turn portion.

  As described above, in the wave winding coil 1, since the first coil portion 2 and the second coil portion 3 are folded back at the connecting portion 4, the connecting portions between the coils can be reduced. Furthermore, since the first coil portion 2 and the second coil portion 3 of the wave winding coil 1 are folded back in the connecting portion 4 in the direction (direction along the D3 direction) orthogonal to the direction in which the straight portions 11 are arranged (direction D1). The wave winding coil 1 before being spirally wound can be formed into a sheet shape on one plane. Therefore, the wave winding coil 1 having a plurality of layers can be easily formed.

  The two-layer wave winding coil 1 folded back at the connecting portion 4 is wound into a spiral shape having a smaller diameter than the shaft hole 51, and then inserted into the shaft hole 51. Then, the wave winding coil 1 is expanded in diameter from the opening 521 of the slot 52 toward the bottom 522, and the straight portion 11 of each layer is inserted into the slot 52 without being knitted. Since each coil wire rod 10 that constitutes the wave winding coil 1 is not woven, it is possible to move freely by itself. Therefore, a plurality of coil wire rods 10 can be simultaneously expanded and contracted, and the straight portion 11 can be easily inserted into the slot 52.

  Here, by forming the wave winding coil 1 by stacking the six coil wire rods 10 as described above, the first coil portion 2 and the second coil portion 3 each have 288 straight portions 11 respectively. Have. Since the stator core 50 has 72 slots, each of the first coil portion 2 and the second coil portion 3 corresponds to four turns of the stator core 50. Specifically, the first coil portion 2 constitutes layer units 21 to 24 for four layers, one layer corresponding to one rotation of the stator core 50, and the second coil portion 3 similarly includes layers for four layers. The units 31 to 34 are configured. Therefore, the wave winding coil 1 is spirally wound and inserted into the slot 52 of the stator core 50, so that the layer units 21 to 24, 31 to 34 for eight layers as a whole are arranged in the radial direction of the slot 52. Stacked.

(First usage mode of wave winding coil)
Next, a first usage mode of the wave winding coil 1 according to the first embodiment will be described with reference to FIGS. 6 to 9.
FIG. 6 is an equivalent diagram showing a first usage pattern of the wave winding coil according to the first embodiment. FIG. 7: is a figure which shows typically the state which wound the wave winding coil which concerns on a 1st usage form in the spiral shape. FIG. 8 is a perspective view showing a state in which the wave winding coil according to the first usage pattern is mounted on the stator core. FIG. 9 is a plan view showing an arrangement state of straight portions of each phase in a slot in the wave winding coil according to the first usage pattern.

  As shown in FIGS. 6 and 7, the first coil portion 2 of the wave winding coil 1 can form an odd number layer out of eight layers, and the second coil portion 3 can form an even number layer. That is, in the spirally wound wave-wound coil 1, if the radially innermost portion (on the side of the opening 521 of the slot 52) of the stator core 50 is the first layer, the layer unit 24 of the first coil unit 2 is The first layer, the layer unit 23 constitutes the third layer, the layer unit 22 constitutes the fifth layer, the layer unit 21 constitutes the seventh layer, and the layer unit 34 of the second coil part 3 constitutes the second layer and the layer unit 33 comprises The fourth layer and the layer unit 32 form the sixth layer, and the layer unit 31 forms the eighth layer. In addition, in FIG. 7, the 1st coil part 2 is shown with the broken line and the 2nd coil part 3 is shown with the solid line. Further, white circles in FIG. 7 indicate boundaries between layer units adjacent to each other in the circumferential direction of the stator core 50, and black circles indicate connecting portions 4 between the first coil portion 2 and the second coil portion 3.

  The connecting portion 4 of the wave winding coil 1 in the wound state is arranged on the outermost peripheral side as shown in FIG. 7. Specifically, the connecting portion 4 includes an outermost peripheral end portion 20a arranged on the outermost peripheral side of the first coil portion 2, an outermost peripheral end portion 30a arranged on the outermost peripheral side of the second coil portion 3, and Are connected. The outermost peripheral end portion 20a corresponds to the one end portion 2a of the first coil portion 2, and the outermost peripheral end portion 30a corresponds to the one end portion 3a of the second coil portion 3. The coil terminal portion 16 of the first coil portion 2 and the coil terminal portion 17 of the second coil portion 3 are arranged on the innermost peripheral side.

  In the wave winding coil 1, the layer unit 24 of the first coil portion 2 is the innermost side (the opening 521 side of the slot 52) and the layer unit 31 of the second coil portion 3 is the outermost side (the bottom portion 522 of the slot 52). Side) and is inserted into the shaft hole 51, and the diameter is expanded toward the opening 521 of the slot 52. Then, the straight part 11 of each layer unit 21-24, 31-34 is sequentially inserted in the slot 52 from the 8th layer to the 1st layer. By inserting the straight portions 11 of all the layer units 21 to 24, 31 to 34 into the corresponding slots 52, as shown in FIGS. 8 and 9, the first coil portion 2 and the second coil portion 3 are formed. The wave winding coil 1 including the layer units 21 to 24, 31 to 34 for eight layers is inserted into the slot 52 of the stator core 50. The straight portions 11 of each of the layer units 21 to 24 and 31 to 34 are arranged at the same radial position in the slot 52, as shown in FIG. 9. Further, the straight portions 11 of the same phase are stacked and arranged in each slot 52.

  According to the wave winding coil 1 according to the first usage mode, the first coil portion 2 and the second coil portion 3 are connected only at the outermost peripheral end portions 20a and 30a, and have a coil shape which is not woven. Therefore, when the slots 52 of the stator core 50 are inserted from the inner diameter side, the coils can be inserted into the slots 52 of the stator core 50 one by one after the first insertion from the connecting portion 4 side into the slots 52. .. Further, since the wave winding coil 1 is not woven, the coils can be expanded and contracted one by one, and it is possible to easily cope with the expansion and contraction of the diameter when the coil is inserted. Therefore, the workability in sequentially inserting the spirally wound wave winding coil 1 into the slot 52 from the eighth layer side is improved.

  Further, since the first coil portion 2 and the second coil portion 3 are coupled by the coupling portion 4 while being displaced in the circumferential direction of the stator core 50, as shown in FIG. 7, the first coil portion 2 and the second coil portion 3 are coupled. The three coil end portions 16 and 17 are also displaced from each other in the circumferential direction of the stator core 50. Therefore, it is possible to easily connect the first coil portion 2 and the second coil portion 3 using the coil terminal portions 16 and 17.

  Furthermore, since the first coil portion 2 and the second coil portion 3 are coupled so as to be displaced from each other, the coupling portion 4 is disposed slightly displaced to the eighth layer side as shown in FIG. 7. At this time, the second coil portion 3 is arranged in each of the sixth layer and the eighth layer with the first coil portion 2 of the seventh layer interposed therebetween, but the connecting portion 4 is arranged so as to be displaced toward the eighth layer side. In addition, in the connecting portion 4, the second coil portions 3 of the sixth layer and the eighth layer (turn portions 12, 12 of the second coil portion 3) do not interfere with each other, and the thickness of the connecting portion 4 in the radial direction is small. Suppressed.

(Second usage mode of wave winding coil)
Next, a second usage mode of the wave winding coil 1 according to the first embodiment will be described with reference to FIGS. 10 and 11.
FIG. 10 is an equivalent diagram showing a second usage pattern of the wave winding coil according to the first embodiment of the present invention. FIG. 11: is a figure which shows typically the state which wound the wave winding coil which concerns on 2nd use form.

  As shown in FIG. 10, the wave winding coil 1 according to the second usage mode is different from the first usage mode in that the first coil section 2 constitutes an even layer and the second coil section 3 constitutes an odd layer. This is different from the wave winding coil 1. That is, in this wave winding coil 1, the layer unit 21 of the first coil portion 2 constitutes the second layer, the layer unit 22 constitutes the fourth layer, the layer unit 23 constitutes the sixth layer, and the layer unit 24 constitutes the eighth layer. , The layer unit 31 of the second coil unit 3 constitutes the first layer, the layer unit 32 constitutes the third layer, the layer unit 33 constitutes the fifth layer, and the layer unit 34 constitutes the seventh layer. This is different from the wave winding coil 1.

  The connecting portion 4 of the wave winding coil 1 in the wound state is arranged on the innermost peripheral side as shown in FIG. 11. Specifically, the connecting portion 4 includes the innermost peripheral end portion 20b arranged on the innermost peripheral side of the first coil portion 2 and the innermost peripheral end portion arranged on the innermost peripheral side of the second coil portion 3. It is configured by connecting the portion 30b and. The innermost peripheral end portion 20b corresponds to the one end portion 2a of the first coil portion 2, and the innermost peripheral end portion 30b corresponds to the one end portion 3a of the second coil portion 3. The coil terminal portions 16 and 17 of the first coil portion 2 and the second coil portion 3 are arranged on the outermost peripheral side.

  The wave winding coil 1 is spirally wound so that the layer unit 24 of the first coil portion 2 is located on the outermost peripheral side (on the side of the bottom portion 522 of the slot 52) and is inserted into the shaft hole 51. Thereafter, the diameter of the straight portion 11 is increased toward the opening 521 of the slot 52, whereby the straight portions 11 are sequentially inserted into the slot 52 from the eighth layer to the first layer. The straight portion 11 of each of the layer units 21 to 24 and 31 to 34 is arranged at the same radial position in the slot 52, as in FIG. 9. Further, the straight portions 11 of the same phase are stacked and arranged in each slot 52.

  Similarly to the case of the wave winding coil 1 according to the first usage mode, the wave winding coil 1 according to the second usage mode sequentially inserts the spirally wound wave winding coil 1 into the slot 52 from the eighth layer side. The effect of improving workability when performing is obtained. Moreover, since the coil end portions 16 and 17 of the first coil portion 2 and the second coil portion 3 are arranged on the outermost peripheral side of the stator core 50, the wires of each phase can be easily taken out from the outer peripheral side of the stator core 50. ..

  Further, since the first coil portion 2 and the second coil portion 3 are connected by the connecting portion 4 while being displaced in the circumferential direction of the stator core 50, as shown in FIG. The layers are offset from each other. At this time, the second coil portions 3 are arranged in the first layer and the third layer, respectively, with the first coil portion 2 sandwiched therebetween, but since the connecting portions 4 are arranged so as to be displaced toward the first layer side, The second coil portions 3 of the layer and the third layer (the turn portions 12, 12 of the second coil portion 3) do not interfere with each other, and the radial thickness of the connecting portion 4 is suppressed.

[Second Embodiment]
Next, the wave winding coil according to the second embodiment will be described with reference to FIGS. FIG. 12: is a front view which shows the state which expanded the wave winding coil which concerns on the 2nd Embodiment of this invention on one plane. FIG. 13 is an equivalent diagram showing the wave winding coil according to the second embodiment. FIG. 14 is a diagram schematically showing a state in which the wave winding coil according to the second embodiment is spirally wound. FIG. 15 is a plan view showing an example of an arrangement state of straight portions of each phase in slots in the wave winding coil according to the second embodiment.

  As shown in FIG. 12, the wave winding coil 100 according to the second embodiment is composed of two independent wave winding coils, a first wave winding coil 1A and a second wave winding coil 1B. Therefore, the wave winding coil 100 has a structure in which it is divided into two in the circumferential direction (D1 direction) of the stator core 50. The first wave winding coil 1A and the second wave winding coil 1B are wave winding coils according to the first embodiment except that the number of layer units is half, that is, the length in the D1 direction is half. It has the same configuration as that of No. 1.

  The first wave winding coil 1A is composed of a first coil portion 2A and a second coil portion 3A, and the second wave winding coil 1B is composed of a first coil portion 2B and a second coil portion 3B. In the first wave winding coil 1A, the first coil portion 2A has only two layer units 201 and 202, and the second coil portion 3A has only two layer units 301 and 302. In addition, in the second wave winding coil 1B, the first coil portion 2B has only two layer units 203 and 204, and the second coil portion 3B has only two layer units 303 and 304.

  In the first wave winding coil 1A, similarly to the wave winding coil 1 according to the first embodiment, one end portion 2a of the first coil portion 2A and one end portion 3a of the second coil portion 3A are the connecting portion 4A. Be connected. The other end 2b of the first coil portion 2A is the coil terminal portion 16A, and the other end 3b of the second coil portion 3A is the coil terminal portion 17A. Similar to the connecting portion 4 of the wave winding coil 1, the connecting portion 4A is connected to the first coil portion 2A by shifting the second coil portion 3A toward the other end 2b of the first coil portion 2A. ..

  Also, in the second wave winding coil 1B, as in the wave winding coil 1 according to the first embodiment, the one end portion 2a of the first coil portion 2B and the one end portion 3a of the second coil portion 3B are connected to each other. 4B is connected. The other end 2b of the first coil portion 2B is a coil terminal portion 16B, and the other end 3b of the second coil portion 3B is a coil terminal portion 17B. Similar to the connecting portion 4 of the wave winding coil 1, the connecting portion 4B is connected to the first coil portion 2B by shifting the second coil portion 3B toward the other end 2b of the first coil portion 2B. ..

  In this wave winding coil 100, the layer unit 201 of the first coil portion 2A in the first wave winding coil 1A constitutes the seventh layer, and the layer unit 202 constitutes the fifth layer. The layer unit 301 of the second coil portion 3A in the first wave winding coil 1A constitutes the eighth layer, and the layer unit 302 constitutes the sixth layer. On the other hand, the layer unit 203 of the first coil portion 2B in the second wave winding coil 1B constitutes the fourth layer, and the layer unit 204 constitutes the second layer. In addition, the layer unit 303 of the second coil portion 3B in the second wave winding coil 1B constitutes the third layer, and the layer unit 304 constitutes the first layer. Therefore, the first coil portion 2A of the first wave winding coil 1A and the second coil portion 3B of the second wave winding coil 1B form an odd layer, and the second coil portion 3A and the second wave portion of the first wave winding coil 1A are formed. The first coil portion 2B of the winding coil 1B constitutes an even layer.

  As shown in FIGS. 13 and 14, the first wave winding coil 1A and the second wave winding coil 1B are arranged such that the other ends 2b, 3b thereof are opposed to each other along the circumferential direction of the stator core 50. That is, the other end 2b of the first coil portion 2A of the first wave winding coil 1A and the other end 3b of the second coil portion 3B of the second wave winding coil 1B are arranged to face each other, and The other end 2b of the second coil portion 3A of the coil 1A and the other end 3b of the first coil portion 2B of the second wave winding coil 1B are arranged to face each other.

  As a result, the layer unit 202 of the first coil portion 2A in the first wave winding coil 1A and the layer unit 303 of the second coil portion 3B in the second wave winding coil 1B are arranged so as to abut each other, and The layer unit 302 of the second coil portion 3A of the first wave winding coil 1A and the layer unit 203 of the first coil portion 2B of the second wave winding coil 1B are arranged so as to abut each other. Then, the layer unit 301 of the second coil portion 3A in the first wave winding coil 1A becomes the outermost peripheral side (the bottom portion 522 side of the slot 52), and the layer unit 304 of the second coil portion 3B in the second wave winding coil 1B becomes It is spirally wound so as to be on the innermost side (on the side of the opening 521 of the slot 52).

  In the wave winding coil 100 in the wound state, the connecting portion 4A of the first wave winding coil 1A is arranged on the outer peripheral side as shown in FIG. Specifically, the connecting portion 4A is arranged on the outermost peripheral end portion 200a of the first wave winding coil 1A, which is arranged on the outermost peripheral side of the first coil portion 2A, and the outermost peripheral side of the second coil portion 3A. It is configured by connecting the outermost peripheral end portion 300a and. The outermost peripheral end portion 200a corresponds to one end portion 2a of the first coil portion 2A in the first wave winding coil 1A, and the outermost peripheral end portion 300a is one end portion of the second coil portion 3A in the first wave winding coil 1A. It corresponds to the part 3a. The coil terminal portions 16A and 17A of the first coil portion 2A and the second coil portion 3A of the first wave winding coil 1A are arranged on the innermost circumference side of the first wave winding coil 1A.

  On the other hand, in the wave winding coil 100 in the wound state, the connecting portion 4B of the second wave winding coil 1B is arranged on the inner peripheral side of the wave winding coil 100, as shown in FIG. Specifically, the connecting portion 4B is arranged on the innermost peripheral end portion 200b of the second wave winding coil 1B, which is arranged on the innermost side of the first coil portion 2B, and on the innermost side of the second coil portion 3B. It is configured by connecting the innermost peripheral end portion 300b arranged. The innermost peripheral end portion 200b corresponds to one end portion 2a of the first coil portion 2B in the second wave winding coil 1B, and the innermost peripheral end portion 300b corresponds to the second coil portion 3B in the second wave winding coil 1B. It corresponds to one end 3a. Further, the coil terminal portions 16B and 17B of the first coil portion 2B and the second coil portion 3B in the second wave winding coil 1B are arranged on the outermost peripheral side of the second wave winding coil 1B, and the It faces the coil end portions 16A and 17A.

  As shown in FIG. 13, the wave winding coil 100 has a first wave winding coil 1</b>A and a second wave winding coil 1</b>B abutted against each other to be elongated, and then a second coil portion of the first wave winding coil 1</b>A. The layer unit 301 of 3A is on the outermost side, and the layer unit 304 of the second coil portion 3B of the second wave winding coil 1B is on the innermost side, and is spirally wound and inserted into the shaft hole 51. To be done. After that, the diameter of the straight portion 11 is increased toward the opening 521 of the slot 52, whereby the straight portions 11 are sequentially inserted into the slot 52 from the eighth layer to the first layer. The straight portion 11 of each of the layer units 21 to 24 and 31 to 34 is arranged at the same radial position in the slot 52, as in FIG. 9. Each coil terminal part 16A, 16B, 17A, 17B is arrange|positioned in the radial midway part of the wave winding coil 100 wound spirally.

  In the wave winding coil 100 according to the second embodiment, the first wave winding coil 1A and the second wave winding coil 1B, which are independent from each other, form a coil for eight layers, and thus the first wave winding coil 100 is arranged on the outer side in the radial direction. The first coil portion 2A and the second coil portion 3A of the wave winding coil 1A and the first coil portion 2B and the second coil portion 3B of the second wave winding coil 1B arranged on the radially inner side have different phases. Connection becomes possible and the degree of freedom of circuit connection is improved.

  Since the wave winding coil 100 is configured without weaving the coil wire rod 10, the coil end portion is offset in the radial direction to form the turn portion, and in the coil shape in which the lane change is realized only in the same layer, the coil is wound. Since the end portions interfere with each other, it is difficult to shift the inner and outer coils by one slot. However, like the wave winding coil 100, the phase can be electrically shifted by arranging the wire connection portions at positions where the slots are shifted. For example, as shown in FIG. 15, the phase of each straight portion 11 of the first coil portion 2A and the second coil portion 3A and the phase of each straight portion 11 of the first coil portion 2B and the second coil portion 3B are set to 1 It is also possible to adopt a configuration in which the slots are shifted.

  Further, when the wave winding coil 100 is mounted in the slot 52 of the stator core 50, it is necessary to expand and contract in the longitudinal direction of the wave winding coil 100, but especially the expansion and contraction allowance of the coil on the outer diameter side becomes large. By providing the connecting portion 4A on the outer diameter side (outermost peripheral side), the productivity of the coil can be simultaneously improved by dividing the long coil into two while improving the mountability of the wave winding coil 100. it can.

  The wave winding coil 1 or 100 shown in each of the above embodiments has eight layer units 21 to 24, 31 to 34, 201 to 204, and 301 to 304, but the number of layers of the wave winding coil is , As long as it includes a plurality of even layers and odd layers, respectively, and is not limited to eight layers. Further, the number of slots of the stator core 50 is not limited to 72 slots.

1, 100 wave winding coil 1A first wave winding coil 1B second wave winding coil 10 coil wire material 11 straight portion 11a (straight portion) upper end portion 11b (straight portion) lower end portion 12 turn portion 121 skewed portion 121a outer portion 121b Inner portion 2, 2A, 2B First coil portion 2a (first coil portion) one end portion 3, 3A, 3B Second coil portion 3a (second coil portion) one end portion 4, 4A, 4B Connection portion 50 stator core 52 slots

Claims (10)

A plurality of coil wire rods having a plurality of straight portions that are juxtaposed and inserted into the slots of the stator core, and a plurality of turn portions that connect the end portions of the adjacent straight portions, and are arranged along the circumferential direction of the stator core. A spirally wound wave coil,
A first coil portion extending in the circumferential direction of the stator core;
A second coil portion extending in the circumferential direction of the stator core and arranged in parallel with the first coil portion;
A connecting portion connecting one end of the first coil portion and one end of the second coil portion,
The wave winding coil in which the first coil portion and the second coil portion are folded back at the connecting portion and are adjacent to each other in the radial direction in the slot. The turn portion has two oblique portions and one top portion,
One of the two skewed portions constitutes an outer portion arranged to be offset radially outward of the stator core with respect to the straight portion, and the other of the two skewed portions is The inner portion is arranged to be offset inward in the radial direction of the stator core with respect to the straight portion,
The wave winding coil according to claim 1, wherein the plurality of coil wire members are overlapped with each other while shifting the outer portions and the inner portions of the turn portion in the circumferential direction of the stator core.   The connecting portion shifts the one end portion of the second coil portion with respect to the one end portion of the first coil portion toward the other end portion side of the first coil portion along the circumferential direction of the stator core. 3. The wave winding coil according to claim 1, wherein the wave winding coils are connected together.   The wave winding coil according to claim 3, wherein the connecting portion is arranged on an outermost peripheral side in a wound state.   The wave winding coil according to claim 4, wherein the first coil portion constitutes an odd layer and the second coil portion constitutes an even layer.   The wave winding coil according to claim 3, wherein the connecting portion is arranged on an innermost peripheral side in a wound state.   The wave winding coil according to claim 6, wherein the first coil portion constitutes an even layer and the second coil portion constitutes an odd layer. It has the 1st wave winding coil and the 2nd wave winding coil which consist of the wave winding coil of any one of Claims 1-3,
In the first wave winding coil, the connecting portion is arranged on the outermost peripheral side in a wound state,
In the second wave winding coil, the connecting portion is arranged on the innermost peripheral side in a wound state,
The other ends of the first wave winding coil and the second wave winding coil are arranged to face each other along the circumferential direction of the stator core, and the second wave winding coil is the first wave winding coil. A wave winding coil disposed on the inner peripheral side of the. The first coil portion of the first wave winding coil constitutes an odd layer, and the second coil portion of the first wave winding coil constitutes an even layer;
The wave winding coil according to claim 8, wherein the first coil portion of the second wave winding coil constitutes an even layer, and the second coil portion of the second wave winding coil constitutes an odd layer.   The wave winding coil according to any one of claims 1 to 9, wherein the first coil portion and the second coil portion are folded back in the connecting portion in a direction orthogonal to a direction in which the straight portions are arranged. ..

Images