JP4061788B2 - Sequentially joined coil of pine needle conductor of rotating electric machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pine needle conductor sequential junction type coil of a rotating electrical machine.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 11-75346, filed by the present applicant, discloses a rotating electrical machine having a pine needle-like conductor sequentially joined type coil.
[0003]
The stator coil of this rotating electrical machine has a large number of pine needle conductors (pine needle conductors) inserted from, for example, the front side into a large number of slots formed in the axial direction in the vicinity of the inner peripheral surface of the cylindrical stator core. Are formed by sequentially connecting the tips of the pine needle conductors protruding to the tips of the other pine needle conductors.
[0004]
Each pine needle-shaped conductor includes a pair of slot conductor portions that are straight portions inserted into the slots, and a U-shaped proximal end coil end that is an exposed portion on the front side that is connected to the proximal ends of the slot conductor portions at both ends. , It is divided into a distal end side coil end that is a portion that is an exposed portion on the rear side that protrudes from both slot conductor portions to the coil end side opposite to the proximal end of the stator core and is sequentially joined to each other.
[0005]
[Problems to be solved by the invention]
A prototype of this pine needle conductor sequential connection type stator coil by the present inventors is shown in FIGS.
[0006]
Reference numeral 1 denotes a proximal end coil end, 2 a stator core, and 3 a slot. The proximal end coil end 1 of the pine needle-like conductor extends from the radially inner side (of the stator core) of the C-shaped head 11 extending substantially in the radial direction and in the axial direction to one side in the circumferential direction. It consists of a first leg 12 and a second leg 13 extending from the radially outer side of the head 11 to the other circumferential side.
[0007]
As apparent from FIGS. 7 and 8, the first leg portion 12 extends in the axial direction from the circumferentially extending portion 121 extending to one side in the circumferential direction and the tip of the circumferentially extending portion 121. It consists of an axially extending portion 122 that continues to the slot conductor portion 4. Similarly, as clearly shown in FIGS. 7 and 8, the second leg portion 13 includes a circumferentially extending portion 131 that extends to one side in the circumferential direction and an axial direction from the tip of the circumferentially extending portion 131. An axially extending portion 132 extending and continuing to the slot conductor portion 5 is formed. The pine needle-shaped conductor is formed by punching a copper plate, and after twisting the legs 12 and 13 of the proximal end coil end 1 to the opposite side in the circumferential direction by an electrical angle of about π, the slot conductor portion is inserted into the stator core.
[0008]
Accordingly, the thickness of the pine needle conductor in the direction perpendicular to the energization is constant within a range not exceeding the manufacturing tolerance (in this specification, the plastic dimensional change due to bending of the pine needle conductor). The width of the pine needle conductor in the direction perpendicular to the energization is the same as that of the conventional round wire coil or rectangular wire coil, with manufacturing tolerances (referred to herein as a plastic dimensional change due to bending of the pine needle conductor). It was fixed within the range not exceeding.
[0009]
However, the present inventors have found that the following problems arise when the pine needle conductor sequential connection type stator coil is inserted through the slot of the stator core.
[0010]
FIG. 9 shows an arrangement state of the five proximal end coil ends 1 in a state where the five pine needle conductors 1 are individually inserted into five slots adjacent in the circumferential direction. 110 is an outer peripheral edge of the head 11, 111 is an inner peripheral edge of the head 11, 112 is a radially inner portion of the inner peripheral edge 111 (a portion on the smaller diameter side away from the stator core), and 113 is a radially outer portion of the inner peripheral edge 111 ( This is a large-diameter portion approaching the stator core). a is a side surface of the head portion 11 facing toward the counterclockwise direction in the circumferential direction, and b is a side surface of the head portion 11 facing toward the circumferentially clockwise direction. However, the side surface b of one head 11 and the side surface a of the head 11 adjacent to the head 11 in the circumferential clockwise direction intersect with each other on the paper surface of FIG. However, the illustration of the intersection line is omitted.
[0011]
From FIG. 9, in the vicinity of the inner peripheral edge 111 of each proximal end coil end 1, the radially inner portion 112 is dragged to the leg portion 12 and bent to the left in the circumferential direction, and the radially outer portion 113 is dragged to the leg portion 13 to circumferentially. You can see that it is bent to the right.
[0012]
Further, in a pair of heads 11 adjacent to each other in the circumferential direction, a radially outer portion 113 of the inner peripheral edge 111 of the left head portion 11 and a radially inner portion 112 of the inner peripheral edge 111 of the right head portion 11 are in the circumferential direction. You can see that they intersect.
[0013]
At this time, since the radially outer portion 113 of the inner peripheral edge 111 of the left head portion 11 and the inner diameter portion 112 of the inner peripheral edge 111 of the right head portion 11 are close to each other, they are easy to contact, and the resin insulating film on the surface The electrical insulation properties are reduced due to damage, and a coil short circuit is likely to occur.
[0014]
The present invention has been made in view of the above problems, and an object of the present invention is to improve the electrical insulation at the proximal end side coil end of the pine needle conductor sequential connection type stator coil without complicating the process.
[0015]
[Means for Solving the Problems]
According to the rotating electrical machine according to claim 1, which has been made to solve the above-described problem, the minimum inner peripheral edge radius of curvature r when viewed in the circumferential direction of the base end side coil end is set to a pair of base end side coil ends. It is characterized in that an inner circumferential curved part larger than the radial gap length d between the slot conductor parts is provided in contact with the inner peripheral edge of the head.
[0016]
If it does in this way, the electrical insulation in the base end side coil end of a pine needle-like conductor sequential connection type stator coil can be improved.
[0017]
That is, if it demonstrates with reference to FIGS. 6-9, the inner diameter part 112 and the outer diameter part 113 which are curving to the circumferential direction opposite side of the inner periphery 111 of the base end side coil end 1 will be this inner periphery. In the pair of heads 11 that are adjacent to each other in the circumferential direction, the outer side portion 113 of the inner periphery 111 of the left head 11 and the inner portion of the right head 11 are removed. This makes it difficult for the radially inner portion 112 of the peripheral edge 111 to come into contact with each other, thereby preventing contact between the two.
[0018]
For example, particularly when this pine needle conductor is manufactured by flat plate punching, the inner peripheral curved portion can be formed without requiring special processing, so that there is an advantage that the cost is not increased by extending the process.
[0019]
According to the configuration of the second aspect, in the pine needle conductor sequential junction type coil of the rotating electric machine according to the first aspect, the proximal end coil end is different in energization different from the radial width of the slot conductor portion by exceeding the manufacturing tolerance. Width in the perpendicular direction (here, the width of the surface connected to the radial surface portion of the slot conductor portion).
[0020]
In this way, it is possible to select a suitable combination of the electrical resistance value of the proximal end coil end and the shape of the accommodation space according to the application without increasing the manufacturing process. The inner peripheral shape can be freely designed to solve the above-described coil short-circuit problem.
[0021]
According to the configuration of claim 3, in the pine needle conductor sequential junction type coil of the rotating electrical machine according to claim 2, the energization perpendicular direction width (width in the direction perpendicular to the energization direction) of the base end side coil end is the slot conductor portion. It is narrower than the manufacturing tolerance than the radial width.
[0022]
If it does in this way, the required space of a coil end can be reduced, the whole physique of a rotary electric machine can be reduced, coil weight can also be reduced and weight reduction can be achieved.
[0023]
According to the configuration of the fourth aspect, in the pine needle conductor sequential junction type coil of the rotating electric machine according to the third aspect, the proximal end coil end is a shaft narrower than the radial width of the slot conductor portion when viewed in the circumferential direction. It has a direction width.
[0024]
In this way, since the axial width of the coil end accommodation space of the rotating electrical machine can be reduced, the axial length of the rotating electrical machine can be compressed.
[0025]
According to the fifth aspect of the present invention, the proximal end side coil end is narrower than the radial width of the slot conductor portion when viewed in the circumferential direction. It has a radial width.
[0026]
In this way, since the radial width of the coil end accommodation space of the rotating electrical machine can be reduced, it is easy to arrange, for example, a water-cooled pipe or a circuit board for motor control in the coil end accommodation spaces on both axial sides of the core. Thus, the degree of freedom in design can be improved.
[0027]
According to the configuration of the sixth aspect, in the pine needle conductor sequential junction type coil of the rotating electric machine according to the second aspect, the proximal end coil end is wider in current than the radial width of the slot conductor portion, exceeding the manufacturing tolerance. It has a perpendicular width.
[0028]
If it does in this way, the electrical resistance value of a coil and the copper loss by it can be reduced, without increasing a manufacturing process.
[0029]
According to a seventh aspect of the present invention, in the pine needle conductor sequential junction type coil of the rotating electrical machine according to any one of the second to sixth aspects, the inner circumferential curved portion is a shaft extending substantially in the axial direction when viewed in the circumferential direction. Since it has a radial side that extends in the radial direction when viewed in the direction side and the circumferential direction, without increasing the average coil length in the proximal end coil end by unnecessarily enlarging the inner circumferential curved portion, The coil short circuit can be prevented.
[0030]
According to the structure of the eighth aspect, in the pine needle conductor sequential junction type coil of the rotating electrical machine according to any one of the second to seventh aspects, the outer peripheral edge of the proximal end coil end is substantially an axis when viewed in the circumferential direction. It has an axial side portion extending in the direction and a radial side portion extending substantially in the radial direction when viewed in the circumferential direction.
[0031]
In this way, an increase in the radial height or axial length of the coil end accommodating space on both axial sides of the core is suppressed to prevent an increase in the size of the rotating electrical machine, and an increase in the manufacturing process is caused. Therefore, it is possible to reduce the coil electrical resistance value and thereby reduce the copper loss.
[0032]
According to the structure of Claim 9, there can exist the effect of Claim 2.
[0033]
According to the structure of Claim 10, there can exist an effect of the said Claim 9.
[0034]
According to the structure of Claim 11, there can exist the effect of Claim 10.
[0035]
According to the structure of Claim 12, the effect of Claim 10 can be produced.
[0036]
According to the structure of Claim 13, the effect of Claim 6 can be produced.
[0037]
According to the structure of Claim 14, the effect of Claim 7 can be produced.
[0038]
According to the structure of Claim 15, the effect of Claim 8 can be produced.
[0039]
According to the structure of Claim 16, the effect of Claim 8 can be improved further.
[0040]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a pine needle conductor junction type coil (also referred to as a pine needle conductor sequential connection type coil) of a rotating electrical machine to which the present invention is applied will be described with reference to the drawings.
[0041]
In addition, the pine needle conductor sequential connection type stator coil of each of the following embodiments has the same structure as the pine needle conductor sequential connection type stator coil already described in FIGS. 5 to 9, and the outer peripheral edge of the proximal end coil end. In addition, since only the shape of the inner peripheral edge is different, the same reference numerals are given to the constituent elements having the same main functions as the constituent elements indicated by the reference numerals in FIGS.
[0042]
[Example 1]
A proximal end side coil end of the pine needle conductor sequential connection type stator coil according to the first embodiment will be described with reference to FIGS. 1 and 2.
[0043]
A number of pine needle conductors are first prepared. Each pine needle-like conductor is provided at the distal end of the base end side coil end 1, a pair of straight slot conductor portions 4, 5 connected to both ends of the base end side coil end 1, and the end portions of the slot conductor portions 4, 5, as in the prior art. It has a coil end (not shown) that is continuous and protrudes to the opposite side of the core 2.
[0044]
Reference numeral 1 denotes a base end side coil end 1 of the pine needle conductor, 1 denotes a stator core, and 3 denotes a slot. The proximal end coil end 1 of the pine needle-like conductor extends from the radially inner side (of the stator core) of the C-shaped head 11 extending substantially in the radial direction and in the axial direction to one side in the circumferential direction. It consists of a first leg 12 and a second leg 13 extending from the radially outer side of the head 11 to the other circumferential side.
[0045]
This base end side coil end 1 is a circumferentially extending portion that extends to one side in the circumferential direction by bending a first leg 12 as shown in FIGS. 121 and an axially extending portion 122 extending in the axial direction from the distal end of the circumferentially extending portion 121 and continuing to the slot conductor portion 4. Similarly, the second leg portion 13 is bent and one side in the circumferential direction is provided. A circumferentially extending portion 131 extending in the axial direction and an axially extending portion 132 extending in the axial direction from the tip of the circumferentially extending portion 131 and continuing to the slot conductor portion 5 are provided. A pair of slots having different electrical angles π in the circumferential direction are individually housed in slot conductor housing positions different in the radial direction. Thereafter, as in the prior art, both ends of each end side coil end are joined in a predetermined order to form a stator coil.
[0046]
In FIG. 2, R is a radius of curvature of the outer peripheral edge 110 of the head 11 of the proximal end coil end 1, r is a radius of curvature of the inner peripheral edge 111 of the head 11 of the proximal end coil end 1, and W is the slot conductor portion 4. 5 is a radial gap between the slot conductors 4 and 5.
[0047]
In this embodiment, as shown in FIG. 2, an inner peripheral edge 11114 is recessed in the head 11 of the proximal end coil end 1 adjacent to the inner peripheral edge 111. The radius of curvature r of the inner peripheral edge 111 (inner peripheral curved portion 114) centered on the center of curvature m is set to be larger than the radial gap d between the pair of slot conductor portions 4 and 5.
[0048]
In this case, since the inner circumferential curved portion 114 is large, the radially inner portion 112 and the radially outer portion of the inner peripheral edge 111 of the pair of heads 11 adjacent to each other in the circumferential direction as described above with reference to FIG. The contact at the time of crossing with 113 can be prevented, and a partial short circuit of the coil can be prevented.
[0049]
In addition, the dashed-dotted line in FIG. 2 is for dividing the head part 11 of the base end side coil end 1, the leg parts 12 and 13, and the slot conductor parts 4 and 5. FIG.
[0050]
[Example 2]
The proximal end side coil end of the pine needle conductor sequential connection type stator coil of the second embodiment will be described with reference to FIG. The proximal end side coil end 1 of this embodiment is obtained by changing the shapes of the outer peripheral edge 110 and the inner peripheral edge 111 of the coil end 1 shown in FIGS.
[0051]
In the proximal end coil end 1 of this embodiment, the radial width is equal to or less than the sum of the width 2W of the slot conductor portions 4 and 5 and the radial gap d therebetween. Further, the inner surface 117 of the leg 12 of the base end side coil end 1 is provided on the same straight line as the inner surface 40 of the slot conductor 4 or on the outer side thereof. The outer surface 118 of the outer diameter 13 is provided on the same straight line as the outer surface 50 of the slot conductor portion 5 or on the outer diameter side.
[0052]
Further, the outer peripheral edge 110 of the head portion 11 of the proximal end coil end 1 is provided within the range of the radially inner surface 40 and the radially outer surface 50. Furthermore, the maximum axial width W1 of the head portion 11 is the slot. The conductor portions 4 and 5 are narrower than the radial width W.
[0053]
If it does in this way, while being able to prevent a coil short circuit by the inner periphery curved part 114, the increase in the coil end accommodation space of a rotary electric machine can be prevented, the physique increase of a rotary electric machine can be prevented, and a coil weight can also be reduced. it can.
[0054]
[Example 3]
The proximal end side coil end of the pine needle conductor sequential connection type stator coil of the third embodiment will be described with reference to FIG. The base end side coil end 1 of this embodiment is obtained by changing the shapes of the outer peripheral edge 110 and the inner peripheral edge 111 of the coil end 1 shown in FIG.
[0055]
In the proximal end coil end 1 of this embodiment, the radial width is equal to or less than the sum of the width 2W of the slot conductor portions 4 and 5 and the radial gap d therebetween. Further, the radially inner surface 117 of the leg portion 12 of the proximal end coil end 1 and the radially inner side portion 119 of the head portion 11 are provided on the same straight line as the radially inner surface 40 of the slot conductor portion 4 or on the radially outer side. The radially outer surface 118 of the leg portion 13 of the proximal end coil end 1 and the radially outer side portion 120 of the head portion 11 are provided on the same straight line as the radially outer surface 50 of the slot conductor portion 5 or on the radially outer side. It has been. Further, the outer peripheral edge 110 of the head portion 11 of the proximal end coil end 1 has a side portion 121 extending in the radial direction.
[0056]
That is, the base end side coil end 1 of this embodiment has a substantially chamfered quadrilateral shape when viewed in the circumferential direction, so that the radial width or axial length of the coil end accommodation space of the rotating electrical machine is not increased. Furthermore, the electrical resistance of the coil can be reduced without complicating the manufacturing process.
[0057]
Further, in this embodiment, the inner peripheral edge 111 of the base end side coil end 1 surrounding the inner peripheral curved portion 114 is also formed with an axially extending side portion 115 extending in the axial direction when viewed in the circumferential direction and a radial direction when viewed in the circumferential direction. And has a radially extending side portion 116 extending in the shape of a circle, and is formed in a substantially chamfered quadrangle as viewed in the circumferential direction. In this way, the above-mentioned coil short-circuit problem can be satisfactorily prevented while reducing the area of the inner circumferential curved portion 114.
[0058]
Furthermore, in this embodiment, since the maximum axial width W1 of the head 11 is narrower than the radial width W of the slot conductors 4 and 5, the rotation of the rotating electric machine is prevented while preventing an increase in the coil end accommodation space. An increase in the size of the electric machine can be prevented, and the coil weight can also be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part of a pine needle-like conductor-joined coil of a rotating electrical machine according to a first embodiment.
2 is a plan view showing a proximal end side coil end of the pine needle conductor shown in FIG. 1; FIG.
3 is a plan view showing a base end side coil end of a pine needle conductor of Example 2. FIG.
4 is a plan view showing a proximal end side coil end of a pine needle conductor of Example 3. FIG.
FIG. 5 is a perspective view of a main part of a pine needle-like conductor-joined coil of a rotating electrical machine of a reference example.
6 is a plan view showing a proximal end side coil end of the pine needle conductor shown in FIG. 5; FIG.
7 is a front view showing a proximal end side coil end of the pine needle conductor shown in FIG. 6; FIG.
8 is a side view showing a proximal end coil end of the pine needle conductor shown in FIGS. 6 and 7. FIG.
FIG. 9 is an array diagram showing a state in which five pine needle conductors shown in FIGS. 5 to 8 are arrayed.
[Explanation of symbols]
1 is a coil end on the proximal side of a pine needle conductor, 2 is a stator core (core), 3 is a slot, 4 is a slot conductor, 5 is a head, 12 is a leg (first leg), 13 is Leg part (second leg part), 110 is the outer peripheral edge of the head 11, 111 is the inner peripheral edge of the proximal end coil end 1, 114 is the inner peripheral curved part of the proximal end coil end 1, and W is the slot conductor part 4, 5 is the radial width, W1 is the axial width of the head 11, 115 is the axial side of the inner peripheral curved portion 114, 116 is the radial side of the inner peripheral curved portion 114, and 117 to 120 are proximal ends. An axial side portion of the outer peripheral edge 110 of the side coil end 1, 121 is a radial side portion of the outer peripheral edge 110 of the proximal end coil end 1.

Claims (16)

A pair of slot conductor portions individually accommodated in different radial positions of the pair of slots of the cylindrical core, and a U-shape projecting from the base ends of the two slot conductor portions to one axial side of the core the have a proximal side coil end has a cross-shaped plurality of pine needle-like conductor which is thin in the circumferential direction by flat stamping,
The proximal end coil end includes a head extending in a substantially radial direction and a substantially axial direction, a first extending from a radially inner side of the head to one side in the circumferential direction and continuing to one of the slot conductor portions. A pine needle-like conductor sequential joining type coil for a rotating electrical machine having a leg and a second leg extending from the outer diameter of the head to the other side in the circumferential direction and continuing to the other of the slot conductors In
When viewed in the circumferential direction, the proximal end coil end has an inner circumferential curved portion with a radius r of the smallest inner circumferential radius that is larger than the radial gap length d between the pair of slot conductor portions in contact with the inner circumferential edge of the head. A sequentially-connected coil of pine needle conductor of a rotating electrical machine. In the pine needle conductor sequential junction type coil of the rotating electrical machine according to claim 1,
The proximal end side coil end has a conduction perpendicular direction width that exceeds a manufacturing tolerance than a radial width of the slot conductor portion, and is a pine needle conductor sequential junction type coil for a rotating electrical machine. In the pine needle conductor sequential junction type coil of the rotating electric machine according to claim 2,
The said basal end side coil end has a conduction perpendicular direction width narrower than the radial width of the slot conductor portion, exceeding the manufacturing tolerance, and is a pine needle conductor sequential junction type coil for a rotating electrical machine. In the pine needle conductor sequential junction type coil of the rotating electric machine according to claim 3,
The proximal end side coil end has an axial width that is narrower than a radial width of the slot conductor portion when viewed in the circumferential direction. In the pine needle conductor sequential junction type coil of the rotating electric machine according to claim 3,
The proximal end side coil end has a radial width narrower than a radial width of the slot conductor portion when viewed in the circumferential direction. In the pine needle conductor sequential junction type coil of the rotating electric machine according to claim 2,
The said basal end side coil end has a current-carrying perpendicular width wider than manufacturing tolerance than the radial width of the said slot conductor part, The pine needle-like conductor sequential joining type coil of the rotary electric machine characterized by the above-mentioned. The pine needle conductor sequential junction type coil of the rotating electrical machine according to any one of claims 2 to 6,
The inner circumferential curved portion includes an axial side portion extending in a substantially axial direction when viewed in the circumferential direction, and a radial side portion extending in a substantially radial direction when viewed in the circumferential direction. Sequentially joined coil of pine needle conductor of rotating electrical machine. The pine needle conductor sequential junction type coil of the rotating electrical machine according to any one of claims 2 to 7,
An outer peripheral edge of the base end side coil end has an axial side portion extending in a substantially axial direction when viewed in the circumferential direction, and a radial side portion extending in a substantially radial direction when viewed in the circumferential direction. Sequentially joined coil of pine needle conductor of rotating electrical machine. A pair of slot conductor portions individually accommodated in different radial positions of the pair of slots of the cylindrical core, and a U-shape projecting from the base ends of the two slot conductor portions to one axial side of the core the have a proximal side coil end has a number of pine needle-like conductor of thin cross-section shaped in the circumferential direction is thin in the circumferential direction by flat stamping,
The proximal end coil end includes a head extending in a substantially radial direction and a substantially axial direction, a first extending from a radially inner side of the head to one side in the circumferential direction and continuing to one of the slot conductor portions. A pine needle-like conductor sequential joining type coil for a rotating electrical machine having a leg and a second leg extending from the outer diameter of the head to the other side in the circumferential direction and continuing to the other of the slot conductors In
The proximal end side coil end has a conduction perpendicular direction width that exceeds a manufacturing tolerance than a radial width of the slot conductor portion, and is a pine needle conductor sequential junction type coil for a rotating electrical machine. In the pine needle conductor sequential junction type coil of the rotating electrical machine according to claim 9,
The said basal end side coil end has a conduction perpendicular direction width narrower than the radial width of the slot conductor portion, exceeding the manufacturing tolerance, and is a pine needle conductor sequential junction type coil for a rotating electrical machine. In the pine needle conductor sequential junction type coil of the rotating electrical machine according to claim 10,
The proximal end side coil end has an axial width that is narrower than a radial width of the slot conductor portion when viewed in the circumferential direction. In the pine needle conductor sequential junction type coil of the rotating electrical machine according to claim 10,
The proximal end side coil end has a radial width narrower than a radial width of the slot conductor portion when viewed in the circumferential direction. In the pine needle conductor sequential junction type coil of the rotating electrical machine according to claim 9,
The said basal end side coil end has a current-carrying perpendicular width wider than manufacturing tolerance than the radial width of the said slot conductor part, The pine needle-like conductor sequential joining type coil of the rotary electric machine characterized by the above-mentioned. The pine needle conductor sequential junction type coil of the rotating electrical machine according to any one of claims 9 to 13,
The inner circumferential curved portion includes an axial side portion extending in a substantially axial direction when viewed in the circumferential direction, and a radial side portion extending in a substantially radial direction when viewed in the circumferential direction. A pine needle-like conductor sequentially joined type coil. The pine needle conductor sequential junction type coil of the rotating electrical machine according to any one of claims 9 to 14,
An outer peripheral edge of the base end side coil end has an axial side portion extending in a substantially axial direction when viewed in the circumferential direction, and a radial side portion extending in a substantially radial direction when viewed in the circumferential direction. Sequentially joined coil of pine needle conductor of rotating electrical machine. The pine needle conductor sequential junction type coil of the rotating electric machine according to claim 15,
The rotating electric machine characterized in that the axial side portion forming the outer peripheral edge of the base end side coil end is provided on a line extending substantially in the axial direction from an outermost diameter edge and an innermost diameter edge of the slot conductor portion. Pine needle-like conductor sequential joining type coil.

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