JP2009011064A - Stator of rotating electric machine, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator of a rotating electric machine, which has excellent assemblability, high coil occupying rate and low coil end. <P>SOLUTION: The stator coil 20 has a pair of slot housed portions 40 housed in slots spaced at a predetermined pitch, and turn portions 42 for connecting the pair of slot housed portions 40 at both the ends of a stator core 12. The pair of slot housed portions 40 are connected to the turn portions 42 in crank portions 46 bent in a circumferential direction and adjacent to each other at the end of the stator core 12, a plurality of conductor strands 32 are surface-contacted and stacked to each other, and a stator coil 20 is formed of a thick coated stacked wires provided with insulating coatings 34, 36 made of a coated resin layer formed on its outer circumference. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stator for a rotating electrical machine and a method for manufacturing the same, and preferably relates to a stator for a rotating electrical machine for driving a hybrid vehicle or an electric vehicle and a method for manufacturing the same.

2. Description of the Related Art In recent years, a rotating electric machine for a hybrid vehicle is desired to have a stator that can reduce the size of a motor and its manufacturing technology because of improved fuel efficiency and restrictions on vehicle mounting. In order to reduce the size, it is desired to increase the slot space factor of the stator winding (conductor) and to reduce the coil end protrusion amount. A conventional stator (see Patent Document 1) is shown in FIG. Note that the reference numerals shown in FIG. 12 are irrelevant to the reference numerals in the other drawings for explaining the embodiments of the present invention described later. In FIG. 12, in order to obtain a high space factor, a method is adopted in which the stator windings have rectangular wires aligned in the radial direction and a shaping coil wound in advance in an annular shape is accommodated in the stator core. This shaping coil has a coil end with a short axial protrusion length that is woven in an aligned state in advance. In FIG. 12, in order to accommodate the shaping coil in the stator core, a technique is adopted in which a plurality of divided cores arranged annularly on the outer peripheral side of the shaping coil are moved in the diameter reducing direction.
Japanese Patent No. 3604326

  According to the above-described stator manufacturing method in which the preshaped coil is accommodated in the stator core slot, the stator winding can have a high space factor and a low coil end. However, when the stator core composed of the split cores shown in FIG. 12 is applied to a vehicle drive motor having a high torque specification and a large amount of magnetic flux, the core back is divided at 1-slot intervals. There has been a problem in that the amount of magnetic flux is reduced and the torque is reduced, and the miniaturization of the rotating electrical machine is hindered.

  The present invention has been made in view of the above circumstances, and provides a stator for a rotating electrical machine that suppresses an increase in magnetic resistance, does not require a core division, and can achieve a high space factor and a low coil end, and a method for manufacturing the same. Its purpose is to do.

  A stator of a rotating electrical machine according to the present invention is a stator of a rotating electrical machine including a cylindrical stator core in which slots and teeth are alternately formed in the circumferential direction, and a stator winding accommodated in the slot. A pair of slot accommodating portions individually accommodated in the two slots spaced apart from each other by a substantially magnetic pole pitch in the circumferential direction, and a turn portion connecting the pair of slot accommodating portions on the outer side in the axial direction of the stator core, The end portion of the turn portion has a crank portion extending in a circumferential direction from the end portion of the slot accommodating portion located at the end portion of the slot along the end surface of the teeth, and the stator windings are mutually connected. A plurality of conductor strands laminated in a surface contact state and insulated from each other by a resin coating and extending in parallel to each other, and a resin coating surrounding the plurality of conductor strands That it is constituted by a thick film multilayer line having the door is set to its features.

  According to the present invention, since the rigidity of the stator winding can be reduced by subdividing the conductor into a plurality of conductor strands, the turn portion can be easily bent. For this reason, even when the total conductor cross-sectional area is increased in order to increase the current capacity of the stator winding, the stator winding formed in a cylindrical shape in advance is disposed on the inner peripheral side of the stator core in a reduced diameter state, and then The operation of inserting the slot accommodating portion into the slot from the radially inner side of the stator core can be facilitated. Further, by utilizing the good elastic deformability of the stator winding, a shaping coil can be inserted inside the non-divided stator core in the radial direction, and the slot accommodating portion of the stator winding can be pushed into the slot in the radial direction. There is no need for core division, the magnetic resistance is not increased, and a winding suitable for low coil end can be achieved with a high space factor.

  In a preferred aspect, the turn portion has a top portion extending in the circumferential direction and obliquely inclined in the radial direction by a width substantially equal to one thick film laminated line. Thereby, the shift | offset | difference of a radial direction required between a pair of slot accommodating parts connected to the both ends of a turn part is realizable by the top part of a turn part. Therefore, it is possible to reduce the height of the coil end corresponding to the axial protruding length of the turn portion from the stator core end surface to the tip of the top. Further, the portion other than the top portion of the turn portion only needs to extend in the circumferential direction and the axial direction, and bending of the turn portion is facilitated.

  In a preferred aspect, the plurality of conductor strands have a rectangular cross-sectional shape that is laminated at least in the circumferential direction in the slot and has a short side extending in the circumferential direction. That is, in this aspect, the plurality of conductor strands have a cross-sectional shape that is laminated at least in the circumferential direction in the slot and flat in the lamination direction. Therefore, the bending rigidity in the circumferential direction of the thick film laminated wire can be reduced, and the turn part can be easily bent in the circumferential direction. Therefore, the insertion step of moving the slot accommodating portion to the slot position after the diameter of the stator winding is reduced on the inner peripheral side of the stator core can be facilitated.

  In a preferred aspect, the plurality of conductor wires have a rectangular cross-sectional shape in which at least a radial direction is laminated in the slot and a short side extends in the radial direction. In other words, in this aspect, the plurality of conductor wires have a cross-sectional shape that is laminated at least in the radial direction in the slot and flat in the lamination direction. Therefore, the bending rigidity in the radial direction of the thick film laminated wire can be reduced, and the turn portion can be easily bent in the radial direction even if the radial dimension of the thick film laminated wire is increased. Therefore, it is possible to meet the large current specification only by increasing the radial dimension of the thick film laminated wire.

  In a preferred aspect, each of the plurality of conductor strands is configured by a rectangular wire having side surfaces extending in the circumferential direction and the radial direction in the slot and stacked in alignment in both the radial direction and the circumferential direction. Has been. Thereby, the bending rigidity of the circumferential direction of a thick film laminated line can be reduced, and it becomes easy to bend a turn part to the circumferential direction. Therefore, the insertion step of moving the slot accommodating portion to the slot position after the diameter of the stator winding is reduced on the inner peripheral side of the stator core can be facilitated. Moreover, a high slot space factor can be realized.

  In a preferred embodiment, the resin coating has a thickness of 100 to 170 μm. Thereby, the insulation film thickness (100-170 micrometers) required for suppression of partial discharge can be ensured stably.

  In a preferred aspect, the resin coating portion is formed by extrusion molding. Thereby, generation | occurrence | production of the partial discharge (corona discharge) between phases by a surge voltage can be suppressed without interphase insulating paper.

  In a preferred embodiment, the resin film is formed of an inner layer insulating film that is formed on the inner side to form the resin film, and an outer layer insulating film that covers the inner layer insulating film to form the resin coating portion, and the outer layer insulating film Has a glass transition temperature lower than that of the inner insulating film. As a result, the outer layer insulating film is softened prior to the inner layer insulating film at a high temperature, and the wires in the same slot are thermally bonded to each other and aligned in the radial direction, thereby improving the mechanical strength.

  In a preferred embodiment, the inner wall surface of the slot is covered with an insulating resin layer. For this reason, the conventional slot insulation paper can be eliminated, and the assembly with the slot accommodating part of a stator winding becomes easy.

  In a preferred embodiment, the insulating resin layer is formed by electrodeposition coating. For this reason, the insulating resin layer does not become too thick, and the space factor of the coil can be improved.

  According to the method for manufacturing a stator for a rotating electrical machine of the present invention, the stator is formed with a cylindrical shaping coil formed in advance so as to be insertable in the slot in the radial direction. An assembly method is adopted in which the stator winding is configured by setting the rotor coil at the rotor arrangement position, and energizing the slot accommodating portion of the shaping coil radially outward to accommodate the slot of the stator core. As a result, the assembly of the stator coil can be greatly simplified, and the division of the stator core becomes unnecessary.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
(Basic structure of stator)
The basic structure of the stator according to the first embodiment of the present invention will be described with reference to FIG. 11 is a stator, 12 is a stator core, 13 is an end face of the stator core 12, 20 is a stator winding, and h is an axial protrusion length (coil end height) of a coil end of the stator winding 20.

  The stator 11 is used for a generator motor for driving a vehicle. A rotor (not shown) is rotatably accommodated inside the stator 11 in the radial direction. A large number of magnetic poles having different polarities alternately in the circumferential direction are formed by permanent magnets on the outer periphery of the rotor. The outer peripheral surface of the rotor faces the inner peripheral surface of the stator 11 via a minute air gap. The stator core 12 is formed by laminating electromagnetic steel plates having a predetermined thickness in the axial direction. The stator winding 20 is a three-phase winding. A first-phase wave winding is wound around the slot 14, and a first-phase wave winding is also wound around the slot 15. That is, a stator winding 20 having the same phase is wound around two slots 14 and 15 (see FIG. 6) adjacent to each other to form a so-called two-slot structure for each pole and each phase. In order to ensure electrical insulation between the stator winding 20 and the stator core 12, slot insulation paper 80 is provided on the inner walls of the slots 14 and 15 (see FIG. 2).

(Wire 30)
The structure of the wire 30 of the stator winding 20 will be described with reference to FIG.

  The wire 30 of the stator winding 20 is composed of four conductor strands 32 having a rectangular cross-section made of copper. The outer peripheral surface of each conductor wire 32 is covered with a resin inner layer insulating film 34, and further, an outer layer insulating film 36 made of resin is formed so as to surround them, finally forming one wire 30. . Each of the four conductor wires 32 is a substantially square rectangular wire, and is arranged so that the sides of the rectangular cross section face each other across the two inner layer insulating films 34. In addition, when each conductor strand 32 is a rectangle, it arranges so that the long sides may face each other and the short sides may face each other, and the wire rod 30 of the stator winding 20 has a substantially rectangular cross section. Placed in.

  The inner insulating film 34 is made of an enamel layer such as polyamideimide, and the outer insulating film 36 is formed of an extrusion-coated resin layer such as PPS. The total thickness of the insulating film including the inner layer insulating film 34 and the outer layer insulating film 36 is set to 100 μm to 170 μm. Thereby, the partial discharge (corona discharge) by a surge voltage can be prevented only with these insulating films. Conventionally, insulating paper is required between the winding phases having a high potential difference. However, this insulating paper can be omitted by the insulating film having the two-layer structure, and winding work is facilitated.

(Shape of stator winding 20)
The shape of the stator winding 20 will be described with reference to FIG.

  The stator winding 20 includes a slot accommodating portion 40 accommodated in each of the slots 14 and 15 of the stator core 12 and two slot accommodating portions 40 extending in the axial direction and the circumferential direction and separated from each other by approximately one magnetic pole pitch in the circumferential direction. It has the turn part 42 which connects edge parts in the axial direction both ends of the stator core 12. As shown in FIG.

  A crank portion (head top portion) 44 that extends in the circumferential direction without protruding outward in the axial direction is formed in the central portion of the turn portion 42. The wire 30 extends in the circumferential direction at the crank portion 44 and is skewed by the radial width so as to be displaced in the radial direction, and both ends of the crank portion 44 are shifted in the radial direction by the radial width. Yes. In other words, one end and the other end of the crank portion 44 are displaced in the radial direction by the radial width of the wire 30. This shift is formed continuously from one end of the crank portion 44 to the other end, and the crank portion 44 is skewed in the radial direction as it is displaced in the circumferential direction. The circumferential width of the skewed crank portion 44 is approximately one slot pitch, and the crank portions 44 of each turn portion connected to the slot accommodating portion at the same radial position of the slot are arranged at equal positions in the axial direction. Thereby, since the turn part 42 of the mutually adjacent wire 30 can be arrange | positioned with high density, the swelling of a coil end can be reduced. Further, as shown in FIG. 1B, the turn part 42 connected to the slot accommodating part 40 in the slot adjacent to this one slot is different from the turn part 42 connected to the slot accommodating part 40 in one slot. It arrange | positions so that it may adjoin to an axial direction. Thereby, the swelling of a coil end can be reduced.

  A crank portion 46 that extends along the end surface 13 of the stator 11 in the circumferential direction (precisely tangential direction) is formed at the end of the turn portion 42 that is continuous with the end of the slot accommodating portion 40. Thereby, the height of a coil end can be reduced. That is, the coil end height can be lowered even with full-pitch winding by the same geometric effect as short-pitch winding with a coil side pitch shorter than the pole pitch. Further, the turn portion 42 has a crank portion 48 that is located in the middle between the end portion and the top portion of the turn portion 42 and extends in the circumferential direction in the same manner as the crank portion 46 at an interval of one slot. Thereby, coil end height can be made still lower.

  With reference to FIG. 6, the effect of the substantially step-like turn part 42 will be described in more detail.

  In FIG. 6, a two-dot chain line indicates an arrangement position of the conventional turn portion 330 extending in the circumferential direction and the axial direction between the slots 14 and 14. The turn part 330 is twisted in the radial direction at, for example, the central part thereof, whereby both ends of the turn part 330 are displaced in the radial direction by the radial width of the wire. On the other hand, the turn part 42 of this embodiment can reduce the axial height h by the amount of the crank part 44 and the crank parts 46 and 48 having the circumferential width d1. In addition, d2 is the circumferential width of the tooth 12b, and 42 is a skew portion of the turn portion 42 extending between the crank portion 44 and the crank portions 46, 48 in the circumferential direction and the axial direction.

  As described above, in this embodiment, since the wire rod 30 in which the conductor wires 32 having a rectangular cross section are stacked is used, the slot space factor can be increased. Further, in this embodiment, the crank portion 46 and the crank portion (head portion) 44 are provided in the turn portion 42 of the stator winding 20, and the intermediate crank portion 48 is provided in two stages, so that a low and compact coil end is provided. Can be realized. In addition, bending of each crank part of the turn part 42 is easy because the deformability of the wire 30 is improved by arranging the wire 30 by aligning the plurality of conductor strands 32. Furthermore, since the rigidity of the turn part 42 after the crank parts 44, 46, 48 are formed by bending is increased, it is possible to satisfactorily suppress the vibration of the coil end accompanying the operation of the rotating electrical machine.

(Manufacturing process of stator winding 20)
An example of a method of winding the above-described stator winding 20 around the stator core 12 will be described with reference to FIGS. FIG. 2 shows a state where the stator winding 20 is assembled to the stator core 12, and FIG. 3 shows a state during the assembly. However, in order to simplify the illustration of FIGS. 2 and 3, the illustration of the turn portion 42 of the stator winding 20 is omitted, and the cross section of the wire 30 of the slot accommodating portion 40 is simplified.

  The stator core 12 is configured by laminating soft magnetic thin plate materials such as electromagnetic steel plates in the axial direction. The stator core 12 has a yoke part (back yoke) 12a and teeth 12b projecting radially inward from the yoke part 12a. Between the adjacent two teeth 12b, odd-numbered slots 14 and even-numbered slots 15 are provided alternately in the circumferential direction. 19a is an opening (slot opening) that opens radially inward of the slots 14 and 15, and the circumferential width of the slots 14 and 15 is equal from the opening 19a to the inner diameter 19b of the slots 14 and 15. Has been. The slots 14 and 15 have an open slot structure.

  According to the method for manufacturing a stator of a rotating electrical machine of this embodiment, a shaping coil having the same shape as the stator winding is prepared in advance in a cylindrical shape so that it can be inserted in the slots 14 and 15 in the radial direction, and the shaping coil is reduced in diameter. Then, the stator core 12 is set at the rotor arrangement position, and thereafter, the diameter reduction of the shaping coil is released, and the slot accommodating portions 40 of the shaping coil are accommodated in the slots 14 and 15 of the stator core 12 to complete the stator winding 20. Let Of course, in the above set, each slot accommodating portion 40 is disposed radially inside the slot in which it is to be accommodated.

  More specifically, in FIG. 3, twelve wires 30 of the slot accommodating portion 40 of the stator winding 20 shaped in advance in a cylindrical shape are arranged adjacent to each other radially inward of the stator core 12. From this state, by moving the wire 30 of the slot accommodating portion 40 of the stator winding 20 radially outward, the slot accommodating portion 40 of the stator winding 20 and the slot insulating paper 80 surrounding it are placed in the slots 14 and 15. Insert (Figure 2). Thereafter, a wedge 82 made of an insulating resin or the like is inserted into the opening 19a of the slot, and the slot accommodating portion 40 of the stator winding 20 is sealed in the slots 14 and 15 (see FIG. 2).

(Second Embodiment)
A second embodiment of the present invention is shown in FIG.

  In the wire rod 70 according to the second embodiment, a crank portion 76 having a shape without twisting is formed at the central portion (the top portion) of the turn portion 74 so as to extend substantially in the circumferential direction as in the first embodiment. . In the crank portion 76, the wire rods 70 are aligned offset in the radial direction by the radial width thereof. That is, one end and the other end of the crank portion 76 are shifted in the radial direction by the radial width of the wire 70. This shift is continuously formed from one end of the crank portion 76 to the other end, whereby the crank portion 76 is skewed in the radial direction as it is displaced in the circumferential direction. The circumferential width of the skewed crank portion 76 is approximately one slot pitch, and the crank portion 76 of each turn portion connected to the slot accommodating portion at the same radial position of the slot may be arranged at an equal position in the axial direction. Is preferred. Thereby, since the turn part 74 of the mutually adjacent wire 70 can be arrange | positioned densely, the swelling of a coil end can be reduced.

  Further, the stator winding 20 has a crank portion 78 that is positioned at an end portion of the turn portion 74 that is continuous with the slot accommodating portion 72 and extends in the circumferential direction (precisely tangential direction) in parallel with the end surface 13 of the stator 11. Is formed. Thereby, the height of a coil end can be reduced similarly to 1st Embodiment. However, the wire 70 of the second embodiment is formed in a straight line between the crank portion 76 and the crank portion 78 and does not have a crank portion on the way. Thereby, it can suppress that the mid-crank parts of the wire rod 70 interfere spatially at the coil end. Thus, the wire rod 30 of the turn portion 74 extending from the radially inner slot accommodating portion 72 to the radially outer slot accommodating portion 72 is displaced in the radial direction, and the combination operation and the slot accommodating portion 72 of the stator winding 20 are performed. The operation of inserting into the slots 14 and 15 is facilitated.

  Furthermore, in this embodiment, the insulating resin layer is formed with a thickness of 40 μm to 80 μm on the inner wall of the slot by electrodeposition coating. Thereby, since the thickness of the outer insulating coating 36 shown in FIG. 4 can be minimized, the space factor of the slot accommodating portion 72 of the stator winding 20 can be improved without impairing the productivity.

(Third embodiment)
A third embodiment of the present invention is shown in FIGS.

  As shown in FIG. 9, the wire 70 of the stator winding 20 includes six conductor wires 32 having a rectangular cross section made of copper. The outer periphery of the conductor wire 32 is covered with an inner insulating film 34, and the outer periphery thereof is covered with an outer insulating film 36, whereby the wire 70 is substantially a single wire. The six conductor wires 32 are stacked in two rows in the direction in which the long sides of the rectangular cross section touch each other and in three rows in the direction in which the short sides touch each other. The long side extends in the radial direction and the short side extends in the circumferential direction.

  The inner insulating film 34 is formed of an enamel layer such as polyamideimide, and the outer insulating film 36 is formed of an extrusion coating resin layer such as PPS. The thickness of the insulating coating including the inner insulating coating 34 and the outer insulating coating 36 is set to 100 μm to 170 μm, and only this insulating coating prevents partial discharge (corona discharge) due to surge voltage.

  In FIG. 8, the stator core 12 is made of a soft magnetic thin plate material such as an electromagnetic steel plate, and forms a yoke portion 12a and teeth 12b protruding from the yoke portion 12a toward the inner diameter side. Slots 14 and 15 having parallel side walls are provided between the teeth 12b, and an open slot structure is adopted.

  All the wire rods 70 of the slot accommodating portions 72 of the stator winding 20 are arranged in advance in the radial direction of the slots to be accommodated. Thus, six slot accommodating portions 72 are arranged in advance in the radial direction inside each slot in the radial direction. Thereafter, by moving the wire 70 of the slot accommodating portion 72 radially outward, each slot accommodating portion 72 is inserted into the slots 14 and 15.

  According to the third embodiment, since the number of strands of the wire 70 shown in FIG. 9 is increased in the radial direction as compared with the case shown in FIG. 4, the current capacity of the wire 70 can be increased, and FIG. Compared with the case shown, the wire rod 70 of the turn portion can be easily bent in the circumferential direction. That is, the wire 70 having a total cross-sectional area that is difficult to manufacture with a wire made of a single rectangular wire can be easily processed, and can handle a large current. Moreover, in this embodiment, since 2 slots per phase per pole are arranged, the shaping process of the wire rod 70 and the diameter reduction process described above can be facilitated as compared with the case of 1 slot per phase per pole. it can.

(Other embodiments)
In the above embodiment, the wire 30 (70) of the stator winding 20 has the conductor wire 32 in the direction in which the long sides of the rectangular cross section contact each other and in the circumferential direction in a plurality of rows (two rows), the direction in which the short sides contact each other and the diameter. Multiple rows (2 or 3 rows) were arranged in the direction. However, when the current capacity is small, as shown in FIGS. 10 and 11, a plurality of rows may be arranged only in one of the circumferential direction and the radial direction, and a single row may be arranged in the other of the circumferential direction and the radial direction. . In FIG. 10, in the state accommodated in the slot, the conductor strands are arranged in a single row in the radial direction, laminated (arranged) in two rows in the circumferential direction, and flat in the laminating direction (circumferential direction). Has a shape. That is, the short side is arranged in the circumferential direction and the long side is arranged in the radial direction. In this way, the bending rigidity in the circumferential direction of the thick film laminated wire (wire) can be reduced, so that it is easy to bend the turn portion in the circumferential direction, and the slot accommodating portion of the stator winding is used as the stator core. The insertion process of moving from the radially inner side to the slot position is also facilitated.

  In FIG. 11, the conductor wires 32 are stacked in a single row in the circumferential direction and in two rows in the radial direction in a state of being accommodated in the slot, and have a flat cross-sectional shape in the stacking direction. That is, the short side is arranged in the radial direction and the long side is arranged in the circumferential direction. For this reason, since the bending rigidity in the radial direction of the thick film laminated wire can be reduced, it becomes easy to bend the turn portion in the radial direction even if the radial dimension of the thick film laminated wire is increased. Large current specifications can be accommodated by increasing the radial dimension of the wire.

  Further, in the above embodiment, the wire 30 (70) of the stator winding 20 has an inner layer insulation made of a thermoplastic resin (for example, polyamideimide) having a relatively high glass transition temperature around the outer periphery of the conductor wire 32 having a rectangular cross section. The outer periphery is covered with an outer insulating film 36 made of a thermoplastic resin (for example, nylon) having a relatively low glass transition temperature. As a result, the outer layer insulating film is softened before the inner layer at high temperatures, and the wires in the same slot are thermally bonded to each other so as to be aligned and integrated in the radial direction, thereby improving the mechanical strength of the stator winding. . In addition, even if excessive vibration or the like is applied, the adhesion portion between the inner layer and the outer layer is peeled off first, so that the adhesion between the inner layer insulating film and the conductor can be maintained and the insulation can be secured.

  In the above embodiment, a rectangular cross-section conductor (flat wire) is used as the wire of the wire 30 (70) of the stator winding 20, but a round cross-section round wire that is easily available is used, and the slot accommodating portion 40 (72 ) May be pressed into a flat cross-sectional shape. If it does in this way, the bending process of the turn part 42 will become easy.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary, it is applicable to various embodiment.

(A) is a perspective view showing a partial shape of the wire rod of the first embodiment, (B) is a partial perspective view showing the stator of the first embodiment in which a stator winding using this wire rod is wound around a stay core. . It is a radial direction model fragmentary sectional view which shows the state which assembled | attached the stator coil | winding to the stator core of 1st Embodiment. It is a radial direction model fragmentary sectional view showing a state in the middle of attachment of a stator winding to a stator core of a 1st embodiment. It is an expanded sectional view of the wire rod of a 1st embodiment. (A) is an overall perspective view of the stator, and (B) is a side view thereof. It is a model circumferential direction expanded view which shows the shape of the coil end of the wire of 1st Embodiment. (A) is a perspective view which shows a partial shape of the wire rod of 2nd Embodiment, (B) is a fragmentary perspective view which shows the stator of 2nd Embodiment which wound the stator winding using this wire rod on the stay core. . It is a radial direction model fragmentary sectional view which shows the state which assembled | attached the stator coil | winding to the stator core of 3rd Embodiment. It is an expanded sectional view of the wire of a 3rd embodiment. It is an expanded wire sectional view of other embodiments. It is an expanded sectional view of the wire rod of other embodiments. (A) is a front view of a conventional stator, and (B) is a side view thereof.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Stator 12 Stator core 12a Joint part 12b Teeth 13 End surface of stator 14 Slot 15 Slot 19a Opening part 19b Inner diameter part 20 Stator winding 30 Wire (thick film laminated wire)
32 Conductor wire 34 Inner layer insulation coating (insulation coating)
36 Outer insulation coating (resin coating)
40 Slot accommodating portion 42 Turn portion 44 Crank portion 46 Crank portion 48 Crank portion 70 Wire rod 72 Slot accommodating portion 74 Turn portion 76 Crank portion 78 Crank portion 80 Slot insulating paper 82 Wedge

Claims (11)

In a stator of a rotating electrical machine comprising a cylindrical stator core in which slots and teeth are alternately formed in the circumferential direction, and a stator winding accommodated in the slot,
The stator winding is a turn that connects a pair of slot accommodating portions individually accommodated in two slots spaced apart from each other by a substantially magnetic pole pitch in the circumferential direction, and the pair of slot accommodating portions on the axially outer side of the stator core. And
The end portion of the turn portion has a crank portion extending in the circumferential direction along the end surface of the teeth from the end portion of the slot accommodating portion located at the end portion of the slot,
The stator windings are laminated in a state of surface contact with each other, and each of them is insulated by a resin coating and extends in parallel with each other, and a resin coating portion surrounding the plurality of conductor wires. A stator for a rotating electric machine, characterized in that the stator is formed of a thick-film laminated wire having the following. The stator of the rotating electrical machine according to claim 1,
The turn part is a stator of a rotating electrical machine having a top part that extends in the circumferential direction and has a head part that is inclined in a radial direction by a width substantially equal to one thick film laminated line. In the stator of the rotating electrical machine according to claim 1 or 2,
The stator of a rotating electrical machine, wherein the plurality of conductor strands have a rectangular cross-sectional shape in which at least a circumferential direction is laminated in the slot and a short side extends in the circumferential direction. In the stator of the rotating electrical machine according to claim 1 or 2,
The stator of a rotating electrical machine, wherein the plurality of conductor wires have a rectangular cross-sectional shape in which at least a radial direction is laminated in the slot and a short side extends in the radial direction. In the stator of the rotating electrical machine according to claim 1 or 2,
The plurality of conductor wires are respectively configured by rectangular wires that have side surfaces extending in a substantially circumferential direction and a substantially radial direction in the slot and are stacked in alignment in both the radial direction and the circumferential direction. The stator of the rotating electrical machine. In the stator of the rotating electrical machine according to any one of claims 1 to 5,
The resin film is a stator of a rotating electric machine having a thickness of 100 to 170 μm. In the stator of the rotary electric machine according to any one of claims 1 to 6,
The resin coating portion is a stator of a rotating electric machine formed by extrusion molding. In the stator of the rotating electrical machine according to any one of claims 1 to 7,
The resin coating comprises an inner layer insulating coating formed on the inner side to form the resin coating, and an outer layer insulating coating that covers the inner layer insulating coating to form the resin coating portion, and the outer layer insulating coating comprises the inner layer insulating coating. A stator for a rotating electrical machine having a glass transition temperature lower than that of a coating. In the stator of the rotating electrical machine according to any one of claims 1 to 8,
An inner wall surface of the slot is a stator of a rotating electric machine covered with an insulating resin layer. The stator of the rotating electrical machine according to claim 9,
The insulating resin layer is a stator of a rotating electric machine formed by electrodeposition coating.   A cylindrical shaping coil formed in advance so as to be insertable into the slot in the radial direction is manufactured, the shaping coil is reduced in diameter and set at the rotor arrangement position of the stator core, and the slot accommodating portion of the shaping coil is arranged radially outside. The method of manufacturing a stator for a rotating electrical machine according to any one of claims 1 to 10, wherein the stator winding is configured by being energized to be accommodated in each slot of the stator core.

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