JP4539263B2 - Motor stator and coil forming method thereof - Google Patents

Description

  The present invention relates to a stator for a motor and a method for forming a coil loaded in a slot of the stator.

  One type of motor stator is composed of a stator core having a slot extending in the axial direction and a coil (winding) inserted into the slot, and one end of the coil (coil end) is pivoted from one end surface of the stator core. Some project in the direction. The protruding coil end is made of a conductive wire (for example, enameled wire) provided with an insulating coating, but it may be difficult to say that the insulating coating alone is sufficient for insulation.

In the conventional stator (see Patent Document 1), as shown in FIG. 14, one end and the other end of the arc-shaped coil end 201 of the coil 200 are inserted into the slots 211 that are separated in the circumferential direction of the stator core 210. Insulating paper 203 is interposed between the coil ends 201. The insulating paper 203 includes a flat portion 206 extending in the circumferential direction of the stator core 210 and a plurality of bent portions 207 extending in the radial direction of the stator core 210 and folded back in opposite directions. After the coil 200 is inserted into the slot 211 of the stator core 210, the coil 200 is interposed (inserted) between the coil ends 201 protruding from the other surface of the stator core 210.
Japanese Patent No. 2914164

  In the above conventional example, the insulating paper 205 has a complicated shape, which is not only troublesome to manufacture but also difficult to interpose in the coil end 201. There are also stators having coil ends that are difficult to insulate with the insulating paper 205 and stators having coil ends that are difficult to interpose. For example, there is a stator coil formed by joining a plurality of pine needle-shaped conductor segments.

  When producing this conductor segment, a coil material (not shown) including a pair of straight portions separated in the width direction and a U-shaped turn portion extending from the end portion is connected in the thickness direction (both straight portions). Twist in the direction perpendicular to the direction. Then, a conductor segment including a pair of straight portions and a roof-shaped turn portion is completed. The straight part is inserted into the slot of the stator core, and the turn part protrudes from the end face of the stator core to constitute a coil end.

  Each conductor segment is entirely covered with an insulating film including a roof-shaped turn portion, or an adhesive is supplied to the coil end. However, at the coil end, the turn portions of conductor segments constituting different phases (U phase, V phase and W phase) or the turn portions of conductor segments having different voltages of the same phase are densely packed in the circumferential direction and the radial direction. Yes. Further, the turn portion is often pushed down (in the radial direction) in order to suppress the protruding height in the axial direction, thereby further increasing the degree of congestion.

  For these reasons, it is desirable to insulate adjacent roof-shaped turn portions with insulating paper, but the adjacent turn portions are in contact (contact). Therefore, it is extremely difficult to interpose insulating paper between adjacent turn portions after the formation of the coil end as in the conventional example.

  The present invention has been made in view of the above circumstances, and in the case where the stator coil is formed by joining a plurality of pine needle-shaped conductor segments, the adjacent turn portions are insulated in the circumferential direction at the coil end where the turn portions are densely packed. It is an object of the present invention to provide a stator for a motor that is reliably insulated by a material, and a method of forming a coil with insulating paper that can easily interpose insulating paper between adjacent turn portions used in the stator.

  The present invention has been completed by conceiving that when twisting a conductor segment from a coil material, an insulating material is interposed between adjacent turn portions using a part of the deformed coil material.

(1) A motor stator according to a first invention of the present application, as set forth in claim 1, includes a stator core having a plurality of slots penetrating in the axial direction and spaced in the circumferential direction; and one slot separated by a predetermined pitch And a plurality of pine needle-shaped conductor segments each including one straight portion and the other straight portion inserted into the other slot, and a turn portion extending from the one straight portion and the other straight portion and projecting from the end face of the stator core. A stator coil; interposed between adjacent turn portions of a plurality of conductor segments to insulate between the turn portions, and the insulation is continuous in the circumferential direction, and the linear shape of one conductor segment adjacent in the circumferential direction Between one skewed portion of each conductor segment, which is interposed between the skewed portion and the straight other skewed portion of the same conductor segment in a flat plate shape and arranged in the circumferential direction Characterized in that it consists of; also the interposed insulating material.

  In this motor stator, the stator coil is formed by joining a plurality of conductor segments, and the straight portions are inserted into slots separated by a predetermined pitch. The turn portion protrudes from the end face of the stator core to form a coil end, and an insulating material is interposed between adjacent turn portions to be insulated.

(2) forming method of the second invention by insulating paper with coils, as described in claim 15, including a one straight portion parallel extending from both ends and the other linear portion of the turn portion and the turn portion of the U-shaped A plurality of coil materials are arranged so that a plurality of one linear portions and a plurality of other linear portions extend in the same direction, and a plurality of U-shaped turn portions are radially arranged, and an insulating material is provided between adjacent turn portions in the circumferential direction. A first portion of which is held at a certain distance from one straight portion or the other straight portion, and the remaining portion extends in a radial direction so as to overlap the one straight portion and / or the other straight portion, On the other hand, the pitch between the straight portion and the other straight portion is widened, and a U-shaped turn portion and a portion near the U-shaped turn portion of the one straight portion and the other straight portion are developed to have a roof-shaped turn portion. Segment conductor, one straight line when unfolding Alternatively, the portion near the U-shaped turn portion of the other straight portion is brought into contact with the remaining portion of the insulating material and deformed around the portion, and the remaining portion of the one straight portion near the U-shaped turn portion and the other straight portion Of these, the second step is provided in the circumferential direction between the U-shaped portion and the portion near the turn portion.

  In this coil forming method, in the first step, a plurality of coil materials composed of a U-shaped turn portion and a pair of straight portions are arranged so that the straight portions are parallel and the turn portions are radial. At that time, the insulating paper is arranged between the turn portions adjacent in the circumferential direction so that a part thereof is at a certain distance from the straight line and the remaining part overlaps the straight line portion. In the second step, the pitch of both straight portions is widened, the U-shaped turn portion is developed to form a roof-type turn portion, and a conductor segment is manufactured. Accordingly, the portion of the straight portion near the turn portion deforms the remaining portion of the insulating paper around a part of the straight portion, and between the portion of the straight portion near the turn portion and the portion of the other straight portion near the turn portion. To intervene.

  As described above, (1) according to the motor stator of the first invention, in the motor stator including the stator coil made up of a plurality of conductor segments, there is a gap between adjacent and close turn portions constituting the coil end. Insulation is performed by the insulating material, and as a result, leakage between the turn portions is prevented.

  According to the stator for a motor of claim 2, regardless of whether one of the skewed portions of the conductor segments adjacent to each other in the circumferential direction of the stator core and the other skewed portions of the adjacent conductor segments are out of phase or in phase. Insulated by an insulating material. According to the stator for a motor of claim 3, the one oblique portion and the other oblique portion of the conductor segments adjacent in the radial direction of the stator core are made of the insulating material regardless of whether they are out of phase or in phase. Insulated.

  According to the stator for a motor of claim 4, the one oblique portions of the conductor segments adjacent to each other in the circumferential direction of the stator core and the other oblique portions adjacent to each other, and the one oblique portion of the conductor segments adjacent in the radial direction, On the other hand, the oblique portions are insulated by the insulating material regardless of whether they are out of phase or in phase.

According to the stator for a motor of the first aspect, the insulation between the oblique portions of the conductor segment can be achieved without loss. According to the stator for motors of claims 5 and 6 , it is easy to prepare the insulating paper, and the plurality of conductor-shaped segments in the circumferential direction of the stator core are uniformly provided with a plurality of insulating materials between the adjacent roof-type turn portions. Can be insulated. According to the motor stator of the seventh aspect , in the circumferential direction of the stator core, the adjacent roof-type turn portions of the plurality of conductor segments can be reliably insulated with an insulating material having a necessary and sufficient shape and size.

According to the motor stator of the eighth to twelfth aspects, in the circumferential direction of the stator core, the insulating material that insulates between adjacent roof-type turn portions of the plurality of conductor segments is easily and reliably held at the final predetermined position. Can intervene.

According to the motor stator of the thirteenth aspect , when the insulating material is interposed between the adjacent turn portions, the portion located radially outward can be held, and the intervention is facilitated. According to the motor stator of the fourteenth aspect , the insulation between the adjacent turn portions becomes more reliable.

  (2) According to the method for forming a coil with insulating paper of the second invention, in the first step, the coil material is arranged so that the U-shaped turn portions are radial, and there is a space between adjacent turn portions. Therefore, the insulating material can be easily extended from a radially inner side or outer side to a predetermined position in the space.

  In the second step, the pitch of the one straight line portion and the other straight line portion of the coil material is increased, and the U-shaped turn portion and the one straight portion and the other straight portion closer to the turn portion are developed to produce a conductor segment. At that time, the portion near the turn portion of both the straight portions contacts the remaining portion of the insulating material, deforms the remaining portion in the circumferential direction, and is interposed between the portions near the turn portion. In this way, since the insulating material is interposed between the portions near the turn portion by utilizing the deformation of the portion near the turn portion of both linear portions, the time and labor for interposing the insulating material between the turn portions are reduced. Less is enough.

According to the method for forming a coil with insulating paper according to claim 16 , the deformed remaining portion extends in the circumferential direction between the one linear portion and the other linear portion near the turn portion, and insulates the portion near the turn portion. According to the method for forming a coil with insulating paper according to claim 17 , a portion of the insulating material held in the radial direction is adjacent to a portion near the turn portion of the one straight portion, or near the turn portion of the other straight portion. Insulate the part of Further, the remaining portion deformed in the circumferential direction insulates the portion near the turn portion of the one straight portion and the portion near the turn portion of the other straight portion.

According to the method of forming the insulating paper with the coil of claim 18, since interposing the insulating material before deploying the U-turn portion such as the turn portion of the roof shape, necessary to take into account the contact between the insulating material and the turn portion It is easy to select the shape of the insulating material, the extending direction, and the like.

<Motor, stator, coil>
The motor of the present invention is an AC motor, and includes a synchronous motor and an induction motor. The motor includes a stator, a rotor, a housing, and the like. The stator includes a stator core having a plurality of slots, and a stator coil wound around the stator core using the slots. A stator coil (hereinafter referred to as “coil” as required) includes a first phase coil, a second phase coil, and a third phase coil, and each phase coil is formed by joining a plurality of pine needle-shaped conductor segments. .

<Conductor segment>
a. Shape, type Conductor segments are composed of parallel one straight part and the other straight part inserted into the slots of the stator core, and a roof-shaped turn part projecting in the axial direction from the end face of the stator core by joining one end of both straight parts. Become. The turn portion includes one skewed portion extending from one straight portion and the other skewed portion extending from the other straight portion. The conductor segment further has one joint and the other joint on the opposite side of the turn part with respect to the one straight part and the other straight part. When the adjacent one joint portions are joined and the other adjacent joint portions are joined, the stator coil is completed.

  There are two types of conductor segments. The first type is a case where a plurality of conductor segments are joined in a single ring to form a coil, and the second type is a case where a plurality of conductor segments are joined in a double ring to form a coil. In both the first type and the second type, single or double coils can be arranged in inner and outer multilayers in the radial direction of the stator core.

b. Insulating material Insulating material is interposed between the roof-shaped turns adjacent to the conductor segments and requiring insulation. That is, in addition to the case where adjacent turn portions are in different phases, insulation is necessary when the voltage is different even when the adjacent turn portions are in the same phase. For example, in the first type conductor segment, the insulating material may be interposed in the radial direction of the stator core to insulate between the one slanting part adjacent in the circumferential direction or between the other slanting part (a type). . In some cases, the insulating material insulates between the one oblique portion and the other oblique portion that are interposed in the circumferential direction and adjacent in the radial direction (b type).

  Furthermore, between one skewed portion of a conductor segment with insulation and one skewed portion of another conductor segment adjacent to the circumferential direction of the stator core, and radially with one skewed portion of one conductor segment. In some cases, the other conductor segment adjacent to this is insulated from the other oblique portion (c type). This c-type insulating material has an L shape having a part held radially in the radial center of the turn part, and a remaining part extending in the circumferential direction by deformation, or between adjacent skew parts. It can have an arcuate shape with a portion held in the radial direction and a remaining portion deformed and extended in the circumferential direction.

  The insulating material is preferably made of trapezoidal insulating paper. Two trapezoidal insulating papers can be obtained simultaneously from one band-like insulating paper by cutting the middle part of the trapezoidal insulating paper into a slender rectangular shape, that is, a belt-like insulating paper in an oblique direction. Part of the trapezoidal insulating paper including the opposite side opposite to the oblique side is held in one oblique part or the other oblique part, and the remaining part extends toward the end face of the stator core. Here, the hypotenuse at the tip of the remaining portion is parallel to the end face of the stator core. In other words, the hypotenuse of the leading edge of the insulating paper does not exceed the end face of the stator core in the axial direction of the stator core. The tip is preferably close to the end face, but it may be lightly touched.

  The insulating paper is held such that the long side is on the top side of the turn part, and the corner formed by the opposing side and the long side of the insulating paper does not exceed the top part of the turn part in the protruding direction of the turn part. Further, in the three-dimensional space, the remaining portion extending direction of the insulating paper is the same as the extending direction of the other inclined portion or the one inclined portion that does not hold the insulating paper.

  The remaining portions extending from some of the plurality of insulating papers overlap each other. Further, the shift direction of the remaining portion where the plurality of insulating papers overlap is the same as the extending direction of the other skewed portion or one skewed portion that does not hold the insulating paper. This is because the remaining portion of the insulating paper is deformed at the other skew portion or one skew portion where the insulating paper is not held. The remaining portion of the insulating paper is located in a space surrounded by the one inclined portion holding the insulating paper, the other inclined portion not holding the insulating paper, and the end face of the stator core. That is, the long side and the short side of the trapezoidal insulating paper are close to or lightly in contact with the one oblique portion and the other oblique portion, and do not protrude outward from this.

  A part of the insulating paper held on one skewed portion or the other skewed portion can have a portion located radially outward from the one skewed portion or the other skewed portion. Further, a part of the insulating paper held in the one skew portion or the other skew portion can have a portion that covers the outer surface of the one skew portion or the other skew portion.

  When the first type conductor segments are arranged in two layers on the inner and outer sides in the radial direction of the stator core, the a, b, or c type insulating material is interposed in the inner and outer conductor segments, respectively. Yes. In addition, between the turn part of the inner circumference side conductor segment and the turn part of the outer circumference side conductor segment, in particular, the other (radially outer side) oblique part of the inner circumference side conductor segment and one of the outer circumference side conductor segments (radial direction) An insulating material can be interposed in the circumferential direction between the inside and the skewed portion.

  Moreover, when arrange | positioning a 2nd type conductor segment, an insulating material can be extended in the circumferential direction between the one diagonal part of the inner side conductor segment, and the other diagonal part. In addition, an insulating material is interposed between one oblique portion of the inner conductor segment and one oblique portion of the outer conductor segment, and between the other oblique portion of the inner conductor segment and the other oblique portion of the outer conductor segment. Can be made.

<Coil formation method>
The method for forming the coil with insulating material includes a first step and a second step.

a. First Step The first step is a step of arranging a plurality of coil materials in a predetermined state and extending the plurality of insulating materials to a predetermined position. More specifically, in the first step, a plurality of coil materials having the same shape including one straight portion and the other straight portion parallel to the U-shaped turn portion extending from both ends thereof are arranged in the same direction (parallel). ) And arranged so that the plurality of turn portions are radial. The turn portions of the plurality of coil materials have an annular shape as a whole.

  For this purpose, for example, a twisting device (Japanese Patent No. 3188837) including an inner peripheral side twisting member having a twisting slot into which one straight portion of a coil material is inserted and an outer peripheral side twisting member having a twisting slot into which the other straight portion is inserted. Reference) can be used. On the other hand, the straight line portion is located on a first circular locus having a first radius, and the other straight portion is located on a second circular locus having a second radius larger than the first radius (concentric with the first circular locus).

  As described above, the insulating material is, for example, insulating paper, and the shape thereof can be, for example, a square, a rectangle, or a trapezoid. The relationship between the coil material of the first type and second type conductor segments and the conductor segments is as follows. The U-shaped turn portion of the coil material and the portion closer to the turn portion (one skew portion forming portion) of the one straight portion become one skew portion of the roof-shaped turn portion, and the turn portion and the other straight portion The portion closer to the turn portion (the other inclined portion forming portion) becomes the other inclined portion of the roof-shaped turn portion. This is a case where the diameter of the U-shaped turn portion is relatively small. When the diameter is relatively large, the roof-shaped turn part is formed in the majority of the U-shaped turn part. The portion near the turn portion of the straight portion can be regarded as a part of the U-shaped turn portion (slanting portion).

  The insulating material is held between the turns adjacent to each other in the circumferential direction of the coil material of the first type conductor segment, and a part (holding portion) of the insulating material is held at a certain distance from the one skew portion forming portion or the other skew portion forming portion. The remaining portion (deformation portion) is arranged so as to overlap with the one skew portion forming portion or the other skew portion forming portion in the radial direction. Specifically, a part of the insulating material located at the center in the radial direction of the U-shaped turn portion of the coil material is held (x type). That is, it extends from the central part in the radial direction of the turn part to one skewed part forming part or the other skewed part forming part.

  The insulating material is also held between the one oblique portion forming portions adjacent to each other or between the other adjacent oblique portion forming portions (y type). That is, it can extend from one skewed part forming part to the other skewed part forming part. In order to extend the insulating material in the x-type or y-type state, a part of the insulating material may be held by the holding member. In both the x type and the y type, when the insulating paper has a trapezoidal shape, a part is a part including an opposite side opposite to the hypotenuse. The distance between the long side and the short side of the insulating paper is slightly shorter than the height of the turn part.

  The holding direction of the insulating material is preferably a direction in which the longitudinal direction connects both the skewed portions of the U-shaped turn portion. The number of insulating materials is preferably the same as the number of U-shaped turn portions, but may be different. The shape, extending direction and number of insulating paper are the deformed parts deformed in the circumferential direction of multiple insulating materials in consideration of the shape of the roof-shaped turn part of the conductor segment and the relative positional relationship between adjacent turn parts, etc. It is desirable that they are defined so as to overlap each other and form an annular shape in the circumferential direction of the stator core.

  When the coil material forming the first type conductor segment is arranged in two layers on the inner and outer sides in the radial direction of the twisting device, the above-mentioned a, b or c type insulating material is used for the inner and outer coil materials, respectively. To extend. In addition, an insulating material can be extended in the a, b, or c type between the turn portion of the inner peripheral conductor segment and the turn portion of the outer peripheral conductor segment.

  When the second type conductor segment is formed, a plurality of coil material pairs in which two coil materials having slightly different radii of the turn portions and intervals between the pair of linear portions are arranged in the radial direction, that is, in the width direction, are arranged. Arrange the turn parts to be radial. In that case, an insulating material can be extended to said a, b, or c type between the turn parts of adjacent coil material pairs.

b. Second Step The second step is a step of twisting the coil material to produce a conductor segment, and interposing the insulating paper extended to a predetermined position of the coil material in the first step at a predetermined position of the conductor segment. More specifically, when the pitch is increased by applying a force in a direction orthogonal to the extension direction to at least one of the one linear portion and the other linear portion, the U-shaped turn portion and the one linear portion or the other linear portion are closer to the turn portion. A portion (one skewed portion forming portion or the other skewed portion forming portion) is developed. At that time, one skewed portion forming portion or the other skewed portion forming portion is in contact with the remaining portion of the insulating material and deformed around a part, and the remaining portion is between the one skewed portion forming portion and the other skewed portion forming portion. In the circumferential direction.

  Specifically, in the first type conductor segment, the remaining portion extending further outward or inward in the radial direction from between the adjacent one oblique portion forming portions or between the other oblique portion forming portions is caused by the oblique portion forming portions. A part is deformed into an L shape. Alternatively, the remaining portion extending further outward or inward in the radial direction from between the adjacent other inclined portion forming portions or between the adjacent one inclined portion forming portions is deformed into a bow shape with respect to a part by the inclined portion forming portion. Is done. Note that, instead of deforming the insulating material by contact with the oblique portion forming portion, the remaining portion of the insulating material can be deformed around a part before the U-shaped turn portion is developed.

  As the coil material is twisted, for example, a part (holding portion) of the insulating material held between the skewed portion forming portions is deformed by the developing skewed portion forming portion. (Folded). The insulating material that originally extended in the direction connecting both the skewed portions of the U-shaped turn portion, when the U-shaped turn portion or the like is transformed into a roof-shaped turn portion, the remaining portion becomes a straight portion. The direction changes in the direction you head.

  The folded remaining portion extends between the one oblique portion forming portion and the other oblique portion forming portion which are adjacent in the radial direction. It is desirable that the remaining portion folded in the circumferential direction of an insulating material overlaps with the remaining bent portion in the circumferential direction of an adjacent insulating material, thereby forming an annular insulating paper between one straight portion and the other straight portion. Will be.

  When the coil material forming the first type conductor segment is arranged in two layers on the inner and outer sides in the radial direction of the twisting device and the insulating paper is spread between the two, the remaining part of the insulating material is the inner peripheral side coil material. The other skewed portion forming portion or the one skewed portion forming portion of the outer peripheral side coil material is deformed.

  Further, when the coil material pairs are arranged radially to form the second type conductor segment and the insulating material is extended between the adjacent turn portions, the remaining insulating material is the inner coil material and the outer coil. The material is deformed by one skewed portion forming portion of the material or the other skewed portion forming portion of the inner coil material and the outer coil material.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<First embodiment>
(Electric motor)
The electric vehicle motor shown in FIG. 1 includes a stator 10, a rotor 70, a frame 77, and the like. Among these, the stator (stator) 10 includes a stator core (stator core) 11 and a stator winding (coil) 20, details of which will be described later.

  The rotor (rotor) 70 includes a rotating shaft 71, a rotor core (rotor core) 72 fixed to the rotating shaft 71, and a field winding 74 in which an insulated conductor is wound in a cylindrical shape. The field winding 74 is sandwiched from both sides by a pair of pole cores 73 constituting a rotor core. The frame 77 accommodates the stator 10 and the rotor 70 and rotatably supports the rotating shaft 71 of the rotor 70.

(Stator, coil)
As shown in FIGS. 1 and 2, the stator core 11 of the stator 10 has a cylindrical shape, and a plurality of slots 12a to 12f and the like extending in the axial direction and the radial direction are spaced apart in the circumferential direction. The cross-sectional shape of each slot 12a to 12f is a rectangular shape elongated in the radial direction, and the inner peripheral side is open. Slots 12b and 12e are for U-phase coils, slots 12c and 12f are for V-phase coils, and slots 12a and 12d are for W-phase coils. Coil 20 includes a U-phase coil, a V-phase coil, and a W-phase coil. Each phase coil includes a plurality of inner conductor segments 25 and the like, and outer conductor segments 35 and the like.

  As shown in FIG. 3, the inner circumferential conductor segment 25 includes a pair of straight portions 26a and 26b having a rectangular cross section in the middle in the longitudinal direction, a roof-shaped turn portion 28 at one end, and a pair of joining pieces 31a at the other end. And 31b and has a pine needle shape. On the other hand, the straight portion 26a and the other straight portion 26b are parallel to each other with a predetermined interval. The roof-shaped turn portion 28 includes a pair of skewed portions 28a and 28b and a top portion 28c twisted in the thickness direction. One joining piece 31a and the other joining piece 31b are bent away from each other in a direction orthogonal to the longitudinal direction (circumferential direction of the stator core 11), and the tips 32a and 32b are joined to the tips of other conductor segments in the same phase. The

  The basic shape of the outer peripheral conductor segment 35 is the same as that of the inner peripheral conductor segment 25, but the dimensions are slightly larger.

  As shown in FIG. 2, in each slot 12a to 12f, etc., two straight portions 26a and 26b of the inner peripheral conductor segment 25 and two straight portions 36a and 36b of the outer peripheral conductor segment 35, a total of four. The straight part is inserted. In FIG. 2, illustration of insulating paper is omitted to avoid complication.

  One straight portion 26a of the conductor segment (for U-phase coil) 25 on the inner peripheral side forms the innermost layer of the slot 12b, and the other straight portion 26b forms the second layer of the slot 12e. One skewed portion 28a and the other skewed portion 28b of the turn portion 28 protrude from one end surface. One straight portion 26a of another U-phase coil conductor segment 25 is inserted into the slot 12e.

  One straight line portion of another conductor segment (for V-phase coil) 25 'forms the innermost layer of the slot 12c, and the other straight line portion forms the second layer of the slot 12f. One skewed portion 28a 'and the other skewed portion 28b' of the turn portion 28 'protrude from one end surface. Further, one straight portion of another conductor segment (for W-phase coil) 25 "forms the innermost layer of the slot 12d, and the other straight portion forms the second layer of the slot (not shown). Turn portion 28" The one oblique portion 28a "and the other oblique portion 28b" protrude from one end surface.

  Outer circumferential conductor segments 35, 35 ', and 35 "(only 35 are shown) are disposed on the radially outer sides of the inner circumferential conductor segments 25, 25', and 25", respectively. Since the outer conductor segments 35, 35 'and 35 "have the same shape as the inner conductor segments 25, 25' and 25" (precisely similar), the respective portions are the inner conductor segments. This is indicated by a reference number obtained by adding 10 to the reference numbers of 25, 25 ′ and 25 ″.

(Insulating paper)
The insulating paper 51, 52 and 53 interposed between the turn portions 38, 38 'and 38 "of the outer conductor segments 35, 35' and 35" will be described with reference to Figs. In FIG. 4A, for convenience of illustration, the pitch of the straight portions 36a, 36b, etc. of the conductor segment 35, etc. is shown at a different pitch from the conductor segment 35 of FIG.

  As shown in FIG. 5A, the insulating paper 51 has a trapezoidal shape, and has parallel long sides and short sides, opposing sides perpendicular to these, and a hypotenuse that forms a predetermined angle with them. As shown in FIGS. 4 (a) and 4 (b), a part 51a including the opposite side of the insulating paper 51 is one side of the W-phase conductor segment (not shown) and one of the conductor segments (V-phase) 35 '. The stator core 11 is held in the radial direction between the inclined portion 38a ′. A portion 51a of the insulating paper 51 has a portion 51a 'located radially outward of one skewed portion 38a' of the conductor segment 38 'and a portion 51a "covering the surface of the one skewed portion.

  The remaining portion 51b extends toward the end surface of the stator core 11 between the other inclined portion 38b 'of the conductor segment 35', the other inclined portion 38b of the conductor segment (U phase) 35, and the one inclined portions 38a 'and 38a. ing.

  A part 52a of the insulating paper 52 is held in the radial direction between the one inclined portion 38a 'of the conductor segment 35' and the one inclined portion 38a of the conductor segment 35. The remaining portion 52b extends between the other inclined portion 38b of the conductor segment 35, the other inclined portions 38b and 38b ″ of the conductor segment (W phase) 35 ″, and the one inclined portion 38a and 38a ″. The situation is the same for the insulating paper 53.

  The remaining portion 51 b of the insulating paper 51 has the leading end overlapped with the insulating paper 52, and the remaining portion 52 b of the insulating paper 52 has the leading end overlapped with the insulating paper 53. Thus, in the radial direction, a plurality of insulating papers 51, 52, 53,... Are formed between the other oblique portions 38b, 38b ′ and 38b ″ and the one oblique portions 38a, 38a ′ and 38a ″. Insulating paper is placed.

(Coil forming method)
Next, with reference to FIGS. 5-1 (a) to (c) and FIGS. 5-2 (d) to (f), the twisting process of the conductor segment 35 on the outer peripheral side and the interposing method of the insulating paper 51 and the like will be described. . FIGS. 5-1 (a) to (c) schematically show the state of the coil material before twisting. FIG. 5-1 (a) is a front view, FIG. 5-1 (b) is a side view, and FIG. 5-1 (c) is a CC cross-sectional view of FIG. 5-1 (a).

  As shown in FIG. 5A, each of the coil materials 60, 65, 70 and 75 (here, four are shown only as an example) is one straight portion 61a, 66a, 71a and 76a, and the other It includes straight portions 61b, 66b, 71b and 76b, and U-shaped turn portions 63, 68, 73 and 78. For example, the coil material 60 is for a W-phase coil, the coil material 65 is for a U-phase coil, the coil material 70 is for a V-phase coil, and the coil material 75 is for a W-phase coil.

  One straight portions 61a, 66a, 71a, and 76a are inserted into insertion holes of a cylindrical inner circumferential twist member (not shown) arranged concentrically, and the other straight line is inserted into a cylindrical outer twist member (not shown). The parts 61b, 66b, 71b and 76b are inserted. The plurality of one linear portions 61a and the like and the plurality of other linear portions 61b and the like extend in parallel, and are arranged so that the U-shaped turn portions 63, 68, 73 and 78 are radial in a plan view.

  As shown in FIGS. 5-1 (b) and (c), in the space between the turn part 63 of the coil material 60 and the turn part 68 of the coil material 65, the arm 68a to 68b of the turn part 68 is placed over the base. The insulating paper 51 having a shape is extended (passed). The height of the insulating paper 51 (the vertical dimension in FIG. 5A) is slightly lower than the height of the turn portions 63 and 68.

  A part 51a on the inner peripheral side (lower side in FIG. 5-1 (c)) of the insulating paper 51 is held by the arm part 68a, and the remaining part 51b extends to the outer peripheral side. Similarly, the insulating paper 52 extends between the turn portion of the coil material 65 and the turn portion of the coil material 70, and the insulating paper 53 extends between the turn portion of the coil material 70 and the turn portion of the coil material 75. .

  Subsequently, the inner periphery side twisting member and the outer periphery side twisting member are rotated in opposite directions to each other, and the one straight portions 61a, 66a, 71a and 76a and the other straight lines 61b, 66b and 71 of the coil materials 60, 65, 70 and 75 are rotated. And 76b are opened in the opposite direction in the thickness direction (direction perpendicular to the paper surface of FIG. 5A). The state after opening is shown in FIGS. 5-2 (e) to (f). Fig. 5-2 (d) is a front view, Fig. 5-2 (e) is a cross-sectional view taken along line EE of Fig. 5-2 (d), and Fig. 5-2 (f) is an F view of Fig. 5-2 (d). It is -F sectional drawing. FIGS. 6A and 6B are perspective views of one conductor segment 38 and insulating paper 51 taken out and viewed from different angles.

  As a result of the development, a portion extending from one skewed portion 68 to one straight portion 66a and a portion extending from the other skewed portion 68b to the other straight portion 66b of the coil material 65 are developed. It becomes the skew part 38a and the other skew part 38b. Further, the free ends of the one straight line portion 66a and the other straight line portion 66b are bent to form the joining pieces 31a and 31b (see FIG. 3). This situation is the same for the other coil materials 60, 70 and 75.

  With the development of the turn portion 38, the direction of the insulating paper 51 changes in a direction in which the remaining portion 51b approaches the straight portions 66a and 66b. The remaining portion 51b of the insulating paper 51 is deformed substantially at right angles by the other skewed portion 63b of the coil material 65 and extends in the circumferential direction. The remaining part of the insulating paper 52 and the remaining part of the insulating paper 53 are similarly deformed in the circumferential direction.

  The tip of the remaining portion 51b of the insulating paper 51 is overlapped with the insulating paper 52, and the tip of the remaining portion 52b of the insulating paper 52 is overlapped with the insulating paper 53, thereby forming an annular insulating paper. The annular insulating papers 51, 52, 53,... Are arranged in the radial direction so that one of the oblique portions 28a, 28a 'and 28a "and the other oblique portions 28b, 28b of the conductor segments 35, 35' and 35" on the outer peripheral side. Further, for example, a part 52a of the insulating paper 52 insulates between the other inclined portions 38b 'and 38b adjacent in the circumferential direction. The remaining parts of the insulating paper 51 and 53 The same applies to 51a and the like.

  Next, a plurality of conductor segments 35, 35 'and 35 "in which the adjacent turn portions 28 and the like are insulated by the insulating paper 51 and 52 are extracted from the twisting device, and the one straight portion 36a and the other straight portion 36b and the like. Is inserted into the slot 12 of the stator core 11. As shown in Fig. 5-2 (d), when the straight portions 36a and 36b and the like are inserted into the slot 12, the oblique sides of the insulating paper 51 and the like are on the end face of the stator core 11. Proximity and parallel to this.

(effect)
According to the first embodiment, the following effects can be obtained.

  (1) According to the stator 10, in the circumferential direction of the stator core 11, the turn portions 38 ', 38 and 38 "of the conductor segments 35', 35 and 35", particularly the other oblique portions 38b ', 38b adjacent to each other. And 38b ″ are insulated by a part 51a or the like of a plurality of trapezoidal insulating papers 51. For example, a part 52a of the insulating paper 52 insulates between the other oblique portions 38b and 38b ″. Yes.

  Further, in the radial direction of the stator core 11, an annular insulating paper composed of the remaining portions 51b, 52b,... Of the trapezoidal insulating paper 51, 52,. The parts 38a ′, 38a and 38a ″ are insulated from each other.

  In addition, since the leading end of the insulating paper 51 does not exceed the end face of the stator core, the plurality of necessary and sufficient shapes and sizes of the insulating paper 51 and the like are uniformly provided between the adjacent roof-type turn portions 38 and the like. Can be insulated. Further, the remaining portion 51b of the insulating paper 51 is located in a space formed by the other inclined portion 38b and the insulating paper 51 and the like that insulates between the adjacent turn portions 38 and the like can be easily and reliably finalized. Can be held in place. Since there is a portion 51a 'that is gripped by a part 51a of the insulating paper 51, it is easy to intervene in the adjacent turn portion 38 and the like, and there is a portion 51a "that covers the surface, so insulation is more reliable.

  (2) On the other hand, according to the coil forming method of this embodiment, it is easy to manufacture a stator including a starter coil with insulating paper. When forming the conductor segment 35 and the like from the coil material 60 and the like, it is only necessary to extend the insulating paper 51 and 52 and the like to predetermined positions such as the skew portions 63a and 63b of the coil material 60 and the like before twisting. Since there is a space between adjacent turn portions 63, 68, etc., it is easy to load and hold trapezoidal insulating paper 51, 52, etc.

  The insulating paper 51, 52, etc. in which the portions 51a, 52a, etc. are held are deformed along with the development of the U-shaped turn parts 63, 68, etc. of the coil material 60, etc. Therefore, it is easy to interpose the insulating paper 51 or the like between the turn portions 38 or the like where the conductor segments are densely arranged at the coil end of the stator.

  Note that it is extremely difficult to interpose the insulating paper 51 and the like after the formation of the stator coil formed by joining a plurality of conductor segments 35 and the like as in this embodiment. If intervening, it takes time and labor, and satisfactory insulation is difficult.

<Modification of the first embodiment>
A modification of the first embodiment is shown in FIG. 7 (a) is a front view, FIG. 7 (b) is a sectional view taken along the line BB of FIG. 7 (a), FIG. 7 (c) is a sectional view taken along the line CC of FIG. 7 (a), and FIG. ) Is a sectional view taken along the line DD of FIG. This modification is different from the first embodiment in the shape of the insulating paper 101, 102 and 103 and the method of loading the insulating paper into the coil material 60, 65 and the like.

  As shown in FIGS. 7A to 7D, the insulating paper 101, 102 and 103 having a trapezoidal shape are turned on the turn portion of the first coil material 60 and the turn of the second coil material 65 by a holding jig (not shown). Place between the parts. One end portion 101a of the insulating paper 101 is radially between one skewed portion 63a, 68a etc. and the other skewed portion 63b, 68b etc., and one oblique portion 63a, 68a and the other skewed portion 63b in the circumferential direction. 68b. The other end 101b extends further outward through the other skewed portions 63b, 68b, 73b and 78b. The same applies to the insulating papers 102 and 103.

  When the other straight portions 61b, 66b, 71b and 76b are opened with respect to the one straight portions 61a, 66a, 71a and 76a of the coil material 60, the turn portion is developed. By this development, the other end 101b of the insulating paper 101, 102, etc. is deformed in the circumferential direction by the other skewed portions 63b, 68b, 73b and 78b. As shown in FIG. 7 (f), the other end portions 101b and the like of the insulating papers 101 and 102 overlap each other, and one skewed portions 38a ", 38a and 38a 'and the other skewed portions 38b", 38b and 38b' etc. The ring extends between the two. The hypotenuse is parallel to the end face of the stator core 11.

  According to this modification, in addition to the effects of the first embodiment, while the insulating paper 101 or the like having a comparatively short length is used, the slanted portions 38a ″, 38a and 38a ′ that are particularly required to be insulated are used. On the other hand, the oblique portions 38b ″, 38b and 38b ′ are insulated.

<Second embodiment>
A second embodiment will be described with reference to FIGS. 8, 9, 10 and 11. FIG.

  In this embodiment, as shown in FIG. 8, the conductor segment pair 125 includes an inner conductor segment 130 and an outer conductor segment 140. The inner conductor segment 130 has one straight portion 131 and the other straight portion 132, and a turn portion 136 including one skew portion 134 and the other skew portion 135. Similarly, the outer conductor segment 140 has one straight line portion 141 and the other straight line portion 142, and a turn portion 146 including one skewed portion 144 and the other skewed portion 145.

  The conductor segment pair 125 is manufactured from the coil material pair 150 shown in FIGS. 8 and 10A. The inner coil material 155 includes one straight portion 156 and the other straight portion 157, and a U-shaped U-shaped turn portion 158, and the U-shaped turn portion 158 includes one skew portion 158a and the other skew portion 158b. . Similarly, the outer coil material 160 includes one straight portion 161 and the other straight portion 162, and a U-shaped U-shaped turn portion 163. The U-shaped turn portion 163 includes one skew portion 163a and the other skew portion 163b. Including.

  A method of forming the conductor segment pair 125 from the coil material pair 150 is shown in FIGS. 10A and 10B, which are 10A-10A cross-sectional views and 10B-10B cross-sectional views of FIG. As shown in FIG. 8 and FIG. 10A, a trapezoidal insulating paper 120 between a plurality of pairs of coil materials 150 arranged in a radial pattern from one skewed portion 158a and 163a to the other skewed portion 158b and 163b, respectively. give. One end (part) 120a is held between the other oblique portions 158b and 163b adjacent in the circumferential direction, and the other end (remaining portion) 120b is between the adjacent oblique portions 158a and 163a in the circumferential direction. It extends.

  Next, the one straight portions 156 and 161 of the inner coil material 155 and the outer coil material 160 are inserted into the inner periphery twist member, and the other straight portions 157 and 162 are inserted into the outer periphery twist member, respectively, and twisted in the circumferential direction. As shown in FIG. 10B, the other oblique portions 158b and 163b of the inner coil material 155 and the outer coil material 160 are developed to form conductor segments 130 and 140 having roof-shaped turn portions (see FIG. 9). . At that time, the direction of the tip of the remaining portion 120b of the insulating paper 120 changes in a direction toward the straight portions 141 and 142.

  Due to the development of the other oblique portions 158b and 163b, the remaining portion 120b of the insulating paper 120 is deformed (bent) in the circumferential direction by the other oblique portions 158b and 163b. As a result, as shown in FIG. 10B and FIG. 11, for example, the remaining portion 120b of the insulating paper 120 is accurately positioned between the one oblique portions 134 and 144 and the other oblique portions 135 and 145 of the conductor segments 130 and 140. Is interposed between the one oblique portion 134 and the other oblique portion 135 to insulate them. In addition, the other oblique portions 135 and 145 adjacent in the circumferential direction are insulated by a part 120 a of the insulating paper 120.

  The conductor segment pair 125 is pulled out from the inner peripheral side twisting member and from the outer peripheral side twisting member, and the one straight portions 156 and 161 and the other straight portions 157 and 162 are inserted into the slots of the stator core 11. As shown in FIG. 9, a part 120 a of the trapezoidal insulating paper 120 is in contact with an intermediate portion in the length direction along the other skewed portions 135 and 145. The short side and the long side extend from the part 120a at a substantially right angle, and form a predetermined angle with the end surface 11a of the stator core 11. In the projecting direction of the turn part (vertical direction in FIG. 9), there is a gap x between the long side and the top part m of the roof-type turn part. The oblique side of the tip of the remaining portion 120b extends along the end surface 11a of the core 11 in parallel therewith.

  On the other hand, in the longitudinal direction of the skew portion 134, there is a gap y between the long side of the insulating paper 51 and the one skew portion 134, and the corner n formed by the short side and the other skew portion 135 and the other straight portion 131. There are gaps y and z. That is, the extended portion 51 a of the insulating paper 51 is located in a space formed by the one oblique portion 134, the other oblique portion 135, and the end surface 11 a of the stator core 11.

  As shown in FIGS. 10B and 11, a part 120 a is a part 120 a ′ located radially outward from the one oblique part 145 located on the outermost periphery, and a part covering the surface of the other oblique part 135. (Not shown, see 51a ″ in FIG. 4B). Part 120a insulates the other skewed portion 135 and the like, and the remaining portion 120b is between one skewed portion 134 and the other skewed portion 135, etc. And extends toward the end face of the stator core 11.

  The leading ends of the remaining portions 120b of the plurality of insulating papers 120 forming the annular portion are slightly shifted in the three-dimensional space, that is, in the radial direction, the circumferential direction, and the axial direction of the stator core 11. In the three-dimensional space, the extending direction of the remaining portion 120b of the insulating paper 120 and the extending direction of the other skewed portions 134 and 144 coincide with each other.

  According to this embodiment, in the conductor segment pair 125 composed of the inner conductor segment 130 and the outer conductor segment 140, one oblique portion 134 of one inner conductor segment 130 and the other oblique portion 135 of another inner conductor segment 130. Is insulated by an annular insulating paper formed by overlapping the remaining portion 120b of the insulating paper 120 and the like.

  In addition, the same effect as in the first embodiment can be obtained. Specifically, the insulating paper 120 having a plurality of necessary and sufficient shapes and sizes can be made uniform between the adjacent roof-type turn portions 136 and 146. Can be reliably insulated. Furthermore, the insulating paper 120 that insulates between the adjacent roof-type turn portions 136 and 146 can be easily and reliably held and interposed in the final predetermined position. Since there is a portion 120a 'that is gripped when the insulating paper 120 is interposed between the adjacent turn portions 136 and 146, the interposition is facilitated.

<Modification of Second Embodiment>
The modification shown below differs from the second embodiment in that the coil material is twisted in two stages.

  (1) In the first modification shown in FIG. 12, as shown in FIG. 12B, first, the one straight portion 156 and the other straight portion 157 of the inner coil material 155 are opened in the circumferential direction. Then, in the insulating paper 120 in which the one end portion 120a is held between the other inclined portion 163b of the outer coil material 160, the intermediate portion 120c is bent by the other inclined portion 158b. The other end portion 120 b extends toward the one skewed portion 158 a of the inner coil material 155.

  Subsequently, the other straight portion 157 of the inner coil material 155 and the other straight portion 162 of the outer coil material 160 are opened. Then, as shown in FIG. 12C, the other skewed portion 158b of the inner coil material 155 and the other skewed portion 163b of the outer coil material 160 are developed, and the developed other skewed portions 158b and 163b insulate the insulating paper. The other end 120b of 120 is bent in an oblique direction.

  In this way, the annular insulating paper formed by overlapping the other end portions 120b of the respective insulating papers 120 is the other one of the one oblique portion 134 of the inner conductor segment 130 and the other oblique portion 135 of the other inner conductor segment 130 in the radial direction. Insulates from the skew portion 145.

  Further, the one end portion 120 a of the insulating paper 120 insulates the other oblique portions 145 of the outer conductor segment 140 from each other. Further, the intermediate portion 120 c of the insulating paper 20 is between the other oblique portion 135 of the inner conductor segment 130 and the other oblique portion 145 of the outer conductor segment 140 and between the other oblique portions 135 of the inner conductor segment 130. Insulate.

  (2) In the second modification shown in FIG. 13, first, as shown in FIG. 13B, the other straight portion 157 of the inner coil material 155 and the other straight portion 162 of the outer coil material 160 are opened, and the other oblique portion. 158b and the other oblique portion 163b are developed. Then, the other end portion 120b of the insulating paper 120 holding the one end portion 120a therebetween is bent in an oblique direction.

  Next, as shown in FIG. 13C, the one skewed portion 158a and the other skewed portion 158b of the inner coil material 155 are developed.

  Then, the intermediate portion 120c of the insulating paper 120 is bent into an L shape by the other inclined portion 158b of the inner coil material 155, and finally interposed in the same manner as in the first modified example.

1 is an overall view showing a first embodiment of the present invention. It is a side view of the stator core of 1st Example. It is a perspective view of the conductor segment of 1st Example. (A) is a perspective view which shows the conductor segment with insulation paper of 1st Example, (b) is a perspective view which takes out and shows the relationship between a conductor segment and insulation paper. (A)-(c) is explanatory drawing which shows the formation process (before expansion | deployment) of the conductor segment from the coil raw material of 1st Example, (a) is a front view, (b) is a side view, (c) is ( It is CC sectional drawing of a). (D) to (f) are explanatory views showing a process of forming a conductor segment (after development) from the coil material of the first embodiment, (d) is a front view, and (e) is an EE cross section of (d). (F) is a FF cross-sectional view of (d). (A) And (b) is the perspective view which looked at one conductor segment of the 1st example from a different angle. (A)-(g) is explanatory drawing of the modification of 1st Example. It is a front view of the coil raw material of 2nd Example. It is a front view of the conductor segment of 2nd Example. (A) (b) is explanatory drawing which shows the formation process of a conductor segment from the coil raw material of 2nd Example. It is a perspective view which shows the stator core with an insulating paper of 2nd Example. (A) (b) And (c) is formation explanatory drawing which shows the 1st modification of 2nd Example. (A) (b) And (c) is the formation explanatory view showing the 2nd modification of the 2nd example. It is a perspective view which shows a prior art example.

Explanation of symbols

10: Stator 12a to 12f: Slot 20: Stator coil 25, 35: Conductor segment 26a, 26b: Straight portion 28: Turn portion 28a, 28b: Skew portion 51, 52: Insulating paper

Claims (18)

A stator core having a plurality of slots penetrating in the axial direction and spaced in the circumferential direction; one straight portion and the other straight portion inserted in slots spaced apart by a predetermined pitch; and the one straight portion and the other straight portion A stator coil formed by joining a plurality of pine needle-shaped conductor segments including a roof-shaped turn portion extending from the end face of the stator core, and interposed between the turn portions adjacent to each other, Insulating between the turn portions, the insulation is continuous in the circumferential direction, and the linear one oblique portion of one conductor segment adjacent to the circumferential direction and the straight other oblique portion of the same conductor segment, interposed flat between the insulating material is also interposed between one side oblique Gyobu of the conductor segments arranged circumferentially, motor stator, characterized in that it consists of   The turn part includes one skewed part extending from the one straight part and the other skewed part extending from the other straight part, and the turn part is provided in the circumferential direction of the one skewed part of the conductor segment and the stator core. Between one skewed portion of another conductor segment adjacent and / or between the other skewed portion of one conductor segment and the other skewed portion of another conductor segment adjacent to this in the circumferential direction of the stator core. The motor stator according to claim 1, wherein the insulating material is insulated, and the insulation is continuous in the circumferential direction.   The turn part includes one skewed part extending from the one straight part and the other skewed part extending from the other straight part, and is adjacent to one skewed part of a conductor segment and the stator core in the radial direction. Between the other oblique portion of another conductor segment and / or between the other oblique portion of one conductor segment and one oblique portion of another conductor segment adjacent to the stator core in the radial direction, The stator for a motor according to claim 1, wherein the insulating material is insulated, and the insulation is continuous in the circumferential direction.   The turn part includes one skewed part extending from the one straight part and the other skewed part extending from the other straight part, and the turn part is provided in the circumferential direction of the one skewed part of the conductor segment and the stator core. Between one skewed portion of another conductor segment adjacent and between one skewed portion of a conductor segment and the other skewed portion of another conductor segment adjacent to the stator core in the radial direction; The stator for a motor according to claim 1, wherein an insulating material is insulated, and the insulation is continuous in the circumferential direction. The insulating material is trapezoidal insulating paper, a part including the opposite side opposite to the oblique side is held by the one oblique part or the other oblique part, and the remaining part extends toward the end face of the stator core. Item 5. The motor stator according to any one of Items 2 to 4 . The stator for a motor according to claim 5 , wherein a hypotenuse of a leading end of the remaining portion of the insulating paper is parallel to an end face of the stator core. The motor stator according to claim 6 , wherein a hypotenuse of the leading edge of the insulating paper does not exceed an end surface of the stator core in the axial direction of the stator core. The stator for a motor according to claim 5 , wherein a corner portion formed by the opposite side and the long side of the insulating paper does not exceed the top of the turn portion in the protruding direction of the turn portion of the insulating paper. Wherein not hold the extending direction of the insulating paper insulating paper of the balance the other oblique portion or the one motor stator according to claim 5 and the extending direction of the oblique portion of the same. The motor stator according to claim 5 , wherein the remaining portions of the plurality of insulating papers overlap each other. The stator for a motor according to claim 5 , wherein a shift direction of the remaining portions where the plurality of insulating papers overlap is the same as an extending direction of the other skewed portion or the one skewed portion that does not hold the insulating paper. 6. The motor according to claim 5 , wherein the remaining portion of the insulating paper is located in a space surrounded by the one inclined portion holding the insulating paper, the other inclined portion not holding the insulating paper, and the end face of the stator core. Stator. Some of the insulating paper that is held in the other hand slant part or the other inclined parts are to claim 5 having a portion positioned radially outward of the said contrast slant part or said other oblique section The stator for motors as described. 6. The motor stator according to claim 5 , wherein a part of the insulating paper held in the one skewed portion or the other skewed portion has a portion that covers a surface of the one skewed portion or the other skewed portion. .   A plurality of coil materials including a U-shaped turn portion and parallel one straight portion and the other straight portion extending from both ends of the turn portion, the plurality of one straight portion and the plurality of other straight portions extend in the same direction. The plurality of U-shaped turn portions are arranged in a radial pattern, and between the adjacent turn portions in the circumferential direction, a part of the insulating material is held at a certain distance from the one straight portion or the other straight portion, and the remaining portion Is extended in a radial direction so as to overlap the one straight line portion and / or the other straight line portion, and the pitch between the one straight line portion and the other straight line portion of each coil material is increased, and the U A segment-shaped conductor having a roof-shaped turn portion is developed by expanding a U-shaped turn portion and the portion of the one straight portion and the other straight portion closer to the U-shaped turn portion. Of the straight part, the U-shaped turn part The portion of the insulating material is brought into contact with the remaining portion of the insulating material and deformed around a portion thereof, and the remaining portion of the one straight portion near the U-shaped turn portion and the other straight portion near the U-shaped turn portion. And forming a stator coil with an insulating material, comprising: a second step of interposing the portion in a circumferential direction. In the first step, a part of the insulating material is held at the central portion in the radial direction of the U-shaped turn portion, and in the second step, the portion between the one straight portions adjacent to the U-shaped turn portion. or remainder further extending radially outwardly or inwardly from between portions of the turn portions near of the U-shaped of the adjacent said other straight portions, according to claim 15 which is deformed against a portion in L-shape Of forming a stator coil with an insulating material. In the first step, the insulating material is partly adjacent to the portion near the U-shaped turn portion of the one straight portion, or between the portions of the other straight portion adjacent to the U-shaped turn portion. In the second step, in the second step, the radial portion further extends from the portion near the U-shaped turn portion of the other straight portion adjacent to the portion near the U-shaped turn portion of the adjacent straight portion. The method for forming a stator coil with an insulating material according to claim 15 , wherein a remaining portion extending outward or inward is deformed into a bow shape with respect to a part. In the second step, instead of deforming the remaining portion of the insulating material due to contact with the portion of the one straight portion or the other straight portion near the U-shaped turn portion at the time of deployment, the remaining portion of the insulating material before deployment The method of forming a stator coil with an insulating material according to claim 16 or 17 , wherein the coil is deformed around a part thereof.

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