JP2009303335A - Stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator wherein even when compression molding is not carried out to flatten a coil end conductor portion, the radial dimensions of a coil end can be easily reduced. <P>SOLUTION: A coil conductor 3 is formed in wave winding shape so that it goes around a stator core 2 in its circumferential direction C. In a set of two coil conductors 3, slot conductor portions 31 are so formed that they are in a flat cross-sectional shape and their thickness in the circumferential direction C is smaller than their thickness in the radial direction R and arranged in a slot 21 in the circumferential direction C. Raised conductor portions 33 are twisted by 90° in opposite directions on angular locations opposite each other at their ends inside or outside in the radial direction R in positions where they connect to the slot conductor portions 31. As a result, their cross-sectional shape is changed into a flat cross-sectional shape in which the thickness in the radial direction R is smaller than their thickness in the circumferential direction C. They are arranged in the circumferential direction C of the stator core 2 and the coil end conductor portions 32 are arranged in the axial direction L of the stator core 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stator in which coil conductors are arranged in a distributed winding state in a plurality of slots in a stator core.

For example, a stator for a three-phase motor in which three-phase coils of U-phase, V-phase and W-phase are arranged on the stator core is obtained by winding a copper wire having a circular cross section, many of which are insulated and coated, multiple times. A three-phase coil is used. On the other hand, there are various methods for assembling the coil to the stator core for the purpose of reducing the size of the coil end portion (portion in which a part of the coil protrudes from the axial end surface of the stator core) and simplifying the process of assembling the coil to the stator core. It is considered.
In particular, when a three-phase coil conductor is arranged in a distributed winding state with respect to the stator core, the conductor portion of any phase overlaps the conductor portion of the other phase in the radial direction in the coil end portion. Therefore, in order to reduce the size of the coil end portion, it is conceivable to reduce the radial thickness of the conductor portion in the coil end portion.

  For example, in the coil of Patent Document 1, in order to reduce the size of the coil end portion, the radial thickness of the conductor portion arranged so as to protrude from the axial end surface of the stator core is reduced with respect to the conductor portion arranged in the slot. is doing. As a result, the conductor portion disposed so as to protrude from the axial end surface of the stator core is prevented from becoming thick in the radial direction at the coil end portion.

  Further, for example, in the multiphase wave winding of the rotating electrical machine of Patent Document 2, a coil end portion is configured by connecting a slot conductor portion inserted into each slot of the stator core and an end portion on the same side of the slot conductor portion. It is disclosed that a coil conductor of each phase having a wave winding shape is formed by a crossing conductor portion. In this Patent Document 2, the transition conductor portion is displaced in the radial direction by a step or more in the radial direction more than the radial direction thickness, and the respective transition conductor portions deformed into the same shape are sequentially shifted in the circumferential direction. By arranging, the coil end part is miniaturized, and resistance power loss due to useless wiring extension of the transition conductor part is prevented.

However, as disclosed in Patent Document 1 and the like, in order to reduce the radial thickness of the conductor portion of the coil end portion, it is necessary to form the conductor portion in advance by press molding or the like before assembling to the stator core. There is. At this time, there is a possibility that the insulating coating covering the conductor portion may break or the conductor base material may be significantly hardened. Therefore, it is necessary to perform softening annealing and insulating film processing after molding, which may complicate the processing process.
Further, in Patent Document 2, although the large compression molding for reducing the cross section of the conductor is not performed, the transition conductor portion is formed in a mountain shape, and the arrangement state of the transition conductor portion is restricted, and the coil end There is a possibility that the radial dimension of the portion becomes large.

WO02 / 47239 JP 2000-69700 A

  The present invention has been made in view of such conventional problems, and a stator capable of easily reducing the radial dimension of the coil end portion without performing compression molding for flattening the coil end conductor portion. Is to provide.

The present invention provides a stator in which coil conductors are arranged in a distributed winding state in a plurality of slots in a stator core.
The coil conductor includes a slot conductor portion disposed in the slot in a state parallel to the axial direction of the stator core, and a coil end conductor portion disposed along the circumferential direction of the stator core outside the axial end surface of the stator core. Are connected by a rising conductor portion rising from the end surface in the axial direction of the stator core continuously from the slot conductor portion, and the coil end conductor portions are alternately arranged on one side and the other side in the axial direction of the slot conductor portion. It is formed in a wave shape that is connected multiple times and goes around the circumferential direction of the stator core,
The coil conductors are arranged on the stator core as a set of two,
In the two sets of coil conductors, the slot conductor portions are formed in a flat cross-sectional shape in which the thickness in the circumferential direction is smaller than the thickness in the radial direction, and are arranged in the circumferential direction in the slots. By being twisted by 90 °, the thickness in the radial direction is changed to a flat cross-sectional shape smaller than the thickness in the circumferential direction and arranged in the circumferential direction of the stator core, and the coil end conductor portions are arranged in the axial direction of the stator core. The stator is characterized by the above.

The stator of the present invention is formed by winding a coiled coil conductor that makes a round around the stator core in the circumferential direction and arranging it on the stator core, and a part of the coil conductor protrudes from the axial end surface of the stator core. In addition to reducing the radial dimension of the coil end portion, it is possible to eliminate compression molding for flattening the coil conductor.
Specifically, the coil conductor of the present invention is formed by connecting a slot conductor portion, a rising conductor portion, and a coil end conductor portion in a plurality of turns. In the stator, the two sets of coil conductors are arranged in the circumferential direction of the stator core by the slot conductor portions being arranged in the circumferential direction in the slot, and the rising conductor portions being respectively twisted by 90 °, and the coil ends. The conductor portions are arranged in the axial direction of the stator core.

  The two sets of slot conductors are formed in a flat cross-sectional shape in which the circumferential thickness is smaller than the radial thickness, and the two sets of slot conductors are each twisted by 90 °. Thus, the thickness in the radial direction changes to a flat cross-sectional shape smaller than the thickness in the circumferential direction, and is arranged in the circumferential direction of the stator core. The coil end conductor portions arranged in the axial direction of the stator core are formed by bending the two coil end conductor portions arranged in the circumferential direction while maintaining the state arranged in the two pairs. Yes.

  As a result, the set of two coil conductors arranged adjacent to each other can be easily reduced in radial dimension without performing compression molding for flattening the coil end conductor portion. In addition, the coil end conductors in the other two sets of coil conductors can be easily overlapped on the inner peripheral side or the outer peripheral side in the radial direction of the coil end conductors in the two sets of coil conductors. it can.

  Therefore, according to the stator of the present invention, the radial dimension of the coil end portion can be easily reduced without performing compression molding for flattening the coil end conductor portion.

A preferred embodiment of the present invention described above will be described.
In the present invention, the stator can be used for a motor, a generator, and a motor generator as a rotating electric machine.
In addition, the rising conductor portion in the set of two coil conductors may be twisted in opposite directions with corner positions facing each other at either the inner or outer end in the radial direction. Preferred (claim 2).
In this case, since the radial position of the coil end conductor portion in the set of two coil conductors can be easily matched, the other two wires 1 are arranged on the inner peripheral side or the outer peripheral side of the coil end conductor portion. The coil end conductors in the set of coil conductors can be easily stacked.

  The stator core includes the three-phase coil conductors of U phase, V phase, and W phase, and the rising conductor portion of any one of the three-phase coil conductors has a radial direction. The corners facing each other at the outer end of the coil are twisted in opposite directions to each other as a fulcrum, so that the rise of any one of the other phases of the three-phase coil conductors is arranged in the circumferential direction of the stator core. The conductor portions are arranged in the circumferential direction of the stator core by being twisted in opposite directions with the angular positions facing each other at the radially inner end portions, and the remaining portions of the coil conductors of the three phases are arranged. The rising conductor portion of the phase is at the outer end portion in the radial direction at one end portion in the circumferential direction that overlaps the coil end conductor portion of the other phase of the coil end conductor portion in the radial direction. Face each other The other end in the circumferential direction that is aligned in the circumferential direction of the stator core and overlaps the coil end conductor portion of any of the phases of the coil end conductor portion in the radial direction by being twisted in opposite directions with the corner position as a fulcrum Are arranged in the circumferential direction of the stator core by being twisted in opposite directions with the angular positions facing each other at the radially inner end as the fulcrum, and the coil ends of any of the above phases The conductor portion is disposed on the outer peripheral side in the radial direction, the coil end conductor portion of any one of the other phases is disposed on the inner peripheral side in the radial direction, and the coil end conductor portion of the remaining phase is disposed on the outer periphery in the radial direction. It is preferable to bend and arrange | position at the side and the inner peripheral side (Claim 3).

In this case, the radial width of the three-phase coil end conductor portion can be made substantially equal to the width of the coil end conductor portion for two phases, and the stator coil for a three-phase rotating electrical machine having a three-phase coil conductor. The radial dimension of the end portion can be easily reduced.
Even if the slot conductor portion of the pair of coil conductors in the stator slot is arranged to overlap the slot conductor portion of the other pair of coil conductors in the radial direction, the three-phase coil The entire radial width of the end conductor portion can be made equal to the width of the coil end conductor portion for two phases multiplied by the number of times of overlapping in the radial direction. Therefore, for a three-phase rotating electrical machine having a three-phase coil conductor The radial dimension of the coil end portion of the stator can be easily reduced.

Further, in the stator core, the two sets of coil conductors arranged in the slots adjacent to each other are arranged such that the two sets of coil end conductors arranged in the axial direction of the stator core are further in the axial direction of the stator core. It is preferable that they are arranged side by side to constitute a set of four coil end conductors.
In this case, four coil end conductor portions can be arranged side by side in the axial direction of the stator core, and the radial dimension of the coil end portion can be easily reduced.

The stator core includes the U-phase, V-phase, and W-phase coil conductors, and the plurality of slots in the stator core includes the slot conductor portions in the U-phase coil conductor. There are two U-phase slots, two V-phase slots in which the slot conductor portions of the V-phase coil conductor are disposed, and two W-phase slots in which the slot conductor portions are disposed in the W-phase coil conductor. The two sets of coil conductors are adjacent to each other in the circumferential direction of the stator core, and the four sets of coil conductors are in-phase coil conductors and are arranged in the axial direction of the stator core. Is preferably an in-phase coil end conductor portion.
In this case, a stator for a three-phase rotating electric machine having a three-phase coil conductor can be formed with the radial dimension of the coil end portion easily reduced.

Further, outside of the axial end surface of the stator core, the stator core is disposed between the four sets of in-phase coil end conductors arranged in the axial direction of the stator core in the radial direction of the stator core. It is preferable that the coil end conductor portions of the other phase of the four pieces arranged in the axial direction are arranged (Claim 6).
In this case, the three-phase coil end conductor portion can be disposed in a balanced manner outside the axial end surface of the stator core, and the stator for the three-phase rotating electrical machine having the three-phase coil conductor can be connected to the coil end portion. The radial dimension can be easily reduced.

  Further, among the four sets of three-phase coil end conductor portions arranged in the axial direction of the stator core, a pair of two sets of the above-mentioned one set of four pairs of coil end conductor portions of any phase are connected. The upright conductor portions are arranged in the circumferential direction of the stator core by being twisted in opposite directions with the angular positions facing each other at the radially outer end portions as the fulcrum. A pair of the above-mentioned two upright conductor portions to which the one set of coil end conductor portions are respectively connected are twisted in opposite directions with the corner positions facing each other at the radially inner end portions as fulcrums. Thus, the pair of two standing-up conductor portions, which are arranged in the circumferential direction of the stator core and are connected to the respective one set of four coil end conductor portions of the remaining phases, are connected to the other coil end conductor portions. Any phase At one end in the circumferential direction that overlaps with the coil end conductor portion in the radial direction, the outer end of the radial direction is twisted in opposite directions with the angular positions facing each other as fulcrums, thereby At the other end in the circumferential direction where the coil end conductor portion is aligned in the circumferential direction and overlaps the coil end conductor portion of any one of the phases in the radial direction, the angular positions facing each other at the inner end portion in the radial direction are set. By being twisted in opposite directions to the fulcrum, the coil end conductor portions of a set of four of one of the phases are arranged on the outer peripheral side in the radial direction, arranged in the circumferential direction of the stator core. One set of four coil end conductors of any phase is arranged on the inner peripheral side in the radial direction, and the remaining four sets of coil end conductors are arranged on the outer peripheral side and inner peripheral side in the radial direction. And bend to It is preferably disposed (claim 7).

In this case, the width in the radial direction of the three-phase coil end conductor portion in which one phase is made up of a set of four coil conductors can be set to the width of the coil end conductor portion for approximately two phases. In the stator for a three-phase rotating electric machine having a conductor, the radial dimension of the coil end portion can be easily reduced.
Even if the slot conductor portion of the set of four coil conductors is placed in the stator slot so as to overlap the slot conductor portion of the other set of four coil conductors in the radial direction, the three-phase coil The entire radial width of the end conductor portion can be made equal to the width of the coil end conductor portion for two phases multiplied by the number of times of overlapping in the radial direction. Therefore, for a three-phase rotating electrical machine having a three-phase coil conductor The radial dimension of the coil end portion of the stator can be easily reduced.

Embodiments of the stator according to the present invention will be described below with reference to the drawings.
As shown in FIGS. 3 to 5, the stator 1 of this example is formed by arranging coil conductors 3 in a plurality of slots 21 in the stator core 2 in a distributed winding state. As shown in FIGS. 2, 4, and 6, the coil conductor 3 includes a slot conductor portion 31 disposed in the slot 21 in a state parallel to the axial direction L of the stator core 2 and an outer side of the axial end surface 201 of the stator core 2. The coil end conductor portion 32 arranged along the circumferential direction C of the stator core 2 is connected by a rising conductor portion 33 that continues from the slot conductor portion 31 and rises from the axial end surface 201 of the stator core 2. In addition, the coil conductor 3 is formed in a wave shape that makes a round in the circumferential direction C of the stator core 2 by alternately connecting the coil end conductor portions 32 to the one side L1 and the other side L2 in the axial direction of the slot conductor portion 31 a plurality of times. It is.

  As shown in FIGS. 1, 3, and 7, two coil conductors 3 are arranged in the stator core 2 as a set, and the coil conductor 3 is circulated around the circumferential direction C a plurality of times in the stator core 2. It is arranged. In the set of two coil conductors 3, the slot conductor portion 31 is formed in a flat cross-sectional shape in which the thickness in the circumferential direction C is smaller than the thickness in the radial direction R, and is aligned in the circumferential direction C in the slot 21. In the position where the conductor portion 33 is connected to the slot conductor portion 31, it is twisted by 90 ° in opposite directions with the angular position facing each other at either the inner or outer end in the radial direction R as a fulcrum, The thickness in the radial direction R changes to a flat cross-sectional shape that is smaller than the thickness in the circumferential direction C, and is arranged in the circumferential direction C of the stator core 2, and the coil end conductor portions 32 are arranged in the axial direction L of the stator core 2.

Hereinafter, the stator 1 of this example will be described in detail with reference to FIGS.
In this example, FIG. 1 is a view showing the periphery of the rising conductor portions 33U, 33V, and 33W in the three-phase coil conductors 3U, 3V, and 3W, and FIGS. 2 and 3 are arranged in the U-phase slot 21U. FIG. 3 is a view showing a U-phase coil conductor 3U in a cross section in which a stator 1 is cut in a circumferential direction C. FIG. 4 is a diagram schematically illustrating a formation state of the U-phase coil conductor 3U, and FIG. 5 schematically illustrates an arrangement state in the radial direction R of the coil end conductor portion 32U of the U-phase coil conductor 3U. FIG. FIGS. 6 and 7 are views showing the arrangement of the U-phase coil conductor 3U with respect to the circumferential direction C of the stator core 2 in a planar manner.

  As shown in FIGS. 3 and 5, the stator 1 of this example is used for a three-phase AC motor such as a hybrid car or an electric vehicle, and includes U-phase, V-phase, and W-phase three-phase coils 3U, 3V, 3W is assembled to the stator core 2. The coil conductor 3 of this example is composed of a rectangular wire formed by forming an insulating coating 302 on the surface of a conductor base material 301 having a substantially square cross section made of a copper material. Moreover, the coil conductor 3 is formed in a wave shape by performing bending molding without performing compression molding.

The plurality of slots 21 in the stator core 2 include a U-phase slot 21U in which the slot conductor portion 31U in the U-phase coil conductor 3U is disposed, and a V-phase slot 21V in which the slot conductor portion 31V in the V-phase coil conductor 3V is disposed. Two W-phase slots 21W in which the slot conductor portions 31W of the W-phase coil conductor 3W are arranged are provided adjacent to each other in the circumferential direction C of the stator core 2. The two sets of coil conductors 3 are in-phase coil conductors 3, and the two coil end conductor portions 32 arranged in the axial direction L of the stator core 2 are in-phase coil end conductor portions 32.
As shown in FIGS. 3 and 7, the coil conductor 3 of this example is not subjected to compression molding for flattening the conductor, and the cross-sectional shapes of the slot conductor portion 31, the coil end conductor portion 32, and the rising conductor portion 33. Are substantially the same, and the cross-sectional areas are the same in each of the portions 31, 32, and 33.

  As shown in FIGS. 1, 3, and 4, the stator core 2 has a U-phase, V-phase, and W-phase three-phase coil conductor 3 arranged for six turns (for six turns). The coil conductors 3 for 6 turns of each phase are composed of two sets of coil conductors 3, and two sets of slot conductors 31 are arranged in the circumferential direction C in slots 21 adjacent to each other. The two coil end conductor portions 32 that are respectively arranged side by side and connected to the two slot conductor portions 31 via the rising conductor portion 33 are arranged in the axial direction L outward of the axial end surface 201 of the stator core 2. They are arranged side by side.

  In each phase slot 21, three sets of slot conductor portions 31 in two sets of coil conductors 3 in each phase, a total of six, are arranged in the radial direction R. Further, outside the end surface 201 in the axial direction of the stator core 2, the stator core is positioned between the four in-phase coil end conductor portions 32 arranged in the axial direction L of the stator core 2 in the radial direction R of the stator core 2. Four coil end conductor portions 32 of other phases arranged in the axial direction L of 2 are arranged. 3, in the radial direction R of the stator core 2, the four U-phase coil end conductor portions 32U aligned in the axial direction L of the stator core 2 are arranged in the axial direction L of the stator core 2. The state in which the V-phase coil end conductor portion 32V is arranged is shown.

  Further, as shown in FIGS. 3 and 5, outside the axial end surface 201 of the stator core 2, four coil end conductor portions 32 </ b> U arranged in the axial direction L in the U-phase coil conductor 3 </ b> U and the V-phase coil conductor A coil end conductor portion 32V aligned in the axial direction L at 3V and a coil end conductor portion 32W aligned in the axial direction L in the W-phase coil conductor 3W are three-phase in each portion of the stator core 2 in the circumferential direction C. The coil end conductor portions 32 of one of the phases and the coil end conductor portions 32 of the other phases are arranged in two rows in the radial direction R.

  That is, as shown in FIG. 1 and FIG. 5, outside the axial end surface 201 of the stator core 2, coil end conductor portions 32 of different phases arranged in two rows in the radial direction R in each portion in the circumferential direction C are Four U-phase coil end conductor portions 32U arranged in the axial direction L in the U-phase coil conductor 3U are arranged on the outer peripheral side in the radial direction R, and four W-phase coils arranged in the axial direction L in the W-phase coil conductor 3W. The coil end conductor portion 32W is disposed on the inner peripheral side in the radial direction R, and the four V-phase coil end conductor portions 32V arranged in the axial direction L in the V-phase coil conductor 3V are the outer peripheral side and the inner peripheral side in the radial direction R. It is bent and arranged.

As shown in FIGS. 1 and 8, a pair of two standing conductor portions 33U to which a set of four U-phase coil end conductor portions 32U are respectively connected are arranged at the positions where they are connected to the slot conductor portions 31U. By being twisted by 90 ° in opposite directions with the angular position 330A facing each other at the outer end in the direction R as a fulcrum, the stator cores 2 are aligned in the circumferential direction C. Further, the U-phase set of four upright conductor portions 33U twisted by 90 ° is arranged on the outer peripheral side in the radial direction R together with the coil end conductor portion 32U.
In the figure, the rising conductor portion 33 in each phase of the coil conductor 3 has a twisted portion 331 twisted at 90 ° at a position connected to the slot conductor portion 31.

  As shown in FIG. 1, a pair of two standing conductor portions 33W to which a set of four coil end conductor portions 32W of the W phase are respectively connected are arranged in the radial direction R at positions where they are respectively connected to the slot conductor portions 31W. By being twisted by 90 ° in opposite directions with the angular positions 330B facing each other at the outer end portions, they are aligned in the circumferential direction C of the stator core 2. Further, the set of four upright conductor portions 33W of the W phase twisted by 90 ° are arranged on the inner peripheral side in the radial direction R together with the coil end conductor portion 32W.

  As shown in the figure, a pair of two standing conductor portions 33V to which a set of four V-phase coil end conductor portions 32V are respectively connected are connected to the slot conductor portions 31V at the coil end conductor portions. At one end portion in the circumferential direction C of 32V, the circumferential direction of the stator core 2 is twisted by 90 ° in opposite directions with the angular position 330A facing each other at the outer end portion in the radial direction R. At the other end in the circumferential direction C of the coil end conductor portion 32V, the coil end conductor portion 32V is twisted by 90 ° in opposite directions with the corner position 330B facing each other at the inner end in the radial direction R as a fulcrum. Thus, the stator cores 2 are arranged in the circumferential direction C. Further, a set of four upright conductor portions 33V of the V phase in a twisted state of 90 ° has a radial direction R together with the coil end conductor portion 32V at one end portion in the circumferential direction C of the coil end conductor portion 32V. It is arrange | positioned at the outer peripheral side. Further, the set of four upright conductor portions 33V of the V-phase in a twisted state of 90 ° has a radial direction R together with the coil end conductor portion 32V at the other end in the circumferential direction C of the coil end conductor portion 32V. It is arranged on the inner circumference side.

  As shown in FIG. 5, outside the axial end surface 201 of the stator core 2, each portion in the circumferential direction C of the stator 1 includes a U-phase coil end conductor portion 32 </ b> U and a V-phase coil end conductor portion 32 </ b> V. A portion C1 arranged in the radial direction R, a portion C2 in which the V-phase coil end conductor portion 32V and the W-phase coil end conductor portion 32W are arranged in the radial direction R, a U-phase coil end conductor portion 32U and a W-phase coil end conductor. A portion C3 in which the portion 32W is aligned in the radial direction R is formed.

Further, as shown in FIG. 3, interphase insulating paper 4 is disposed between the coil end conductor portions 32 of different phases. The structure of the interphase insulating paper 4 can be various structures. For example, the interphase insulating paper 4 can be wrapped around two coil end conductor portions 32 arranged in the axial direction L as shown in FIG. Although not shown in the drawings, the interphase insulating paper 4 can have a shape that wraps the four coil end conductor portions 32, or can have a simple shape that is formed parallel to the axial direction L. .
Further, as shown in the figure, a slot insulating paper 25 is also disposed in the slot 21. After the slot conductor paper 31 is wrapped from the outer peripheral side by the slot insulating paper 25, an insulating wedge 26 is provided on the inner peripheral side thereof. Can be arranged.

  As shown in FIGS. 3 and 7, two sets of coil conductors 3 arranged in the in-phase slots 21 adjacent to each other in the stator core 2 are two coil end conductor portions 32 arranged in the axial direction L of the stator core 2. These are further arranged side by side in the axial direction L of the stator core 2 to constitute a set of four coil end conductor portions 32 (indicated by 3C in FIGS. 3 and 7). That is, the coil end conductor 32 and the upright conductor portion 33 in the two sets of the two sets of coil conductors 3 are arranged on both sides of the one axial side L1 and the other axial side L2, respectively. Coil end conductors 32 arranged in the axial direction L and arranged in pairs in the axial direction L on one side L1 in the axial direction, and coil ends arranged in pairs in the axial direction L on the other side L2 in the axial direction The conductor portions 32 are alternately arranged on the inner side in the axial direction and the outer side in the axial direction.

In the stator 1 of this example, a coiled coil conductor 3 that makes a round of the stator core 2 in the circumferential direction C is arranged in the stator core 2 by circulating around the circumferential direction C a plurality of times, and a part of the coil conductor 3 is the stator core 2. It is possible to reduce the dimension in the radial direction R of the coil end portion 30 formed so as to protrude from the axial end surface 201 and to eliminate compression molding for flattening the coil conductor 3.
Specifically, the coil conductor 3 of this example is formed by connecting a slot conductor portion 31, a rising conductor portion 33, and a coil end conductor portion 32 in a plurality of turns.

In the stator 1, the two sets of coil conductors 3 are arranged in opposite directions at positions where the slot conductor portions 31 are arranged in the circumferential direction C in the slot 21 and the rising conductor portion 33 is connected to the slot conductor portion 31. By being twisted by 90 °, the stator core 2 is aligned in the circumferential direction C, and the coil end conductor portions 32 are aligned in the axial direction L of the stator core 2. The two sets of slot conductors 31 are formed in a flat cross-sectional shape in which the thickness in the circumferential direction C is smaller than the thickness in the radial direction R, and the two sets of slot conductors 31 are opposite to each other. By being twisted by 90 ° in the direction, the thickness in the radial direction R changes to a flat cross-sectional shape smaller than the thickness in the circumferential direction C, and is aligned in the circumferential direction C of the stator core 2. The two coil end conductor portions 32 arranged in the circumferential direction C are bent while maintaining the state in which the two coil end conductor portions are arranged in one set, so that the coil end conductor portions arranged in the axial direction L of the stator core 2 are bent. 32 is formed.
In addition, a set of two coil conductors 3 arranged in adjacent slots 21 of the same phase constitute a set of four coil end conductor portions 32 in the axial direction L of the stator core 2.

Thereby, in the set of four coil end conductor portions 32, the dimension in the axial direction L is increased, while the dimension in the radial direction R can be decreased. Therefore, the dimension of the coil end portion 30 in the radial direction R can be easily reduced without performing compression molding for flattening the coil end conductor portion 32.
Moreover, in this example, since it is not necessary to perform compression molding for flattening the coil conductor 3, it is possible to prevent the insulating coating 302 on the surface of the rectangular wire constituting the coil conductor 3 from being peeled off. Further, since it is not necessary to perform compression molding for flattening the coil conductor 3, work hardening is hardly caused in the conductor base material 301 constituting the coil conductor 3. Therefore, after the coil conductor 3 is processed into a wave shape, it is not necessary to perform softening annealing and insulating film processing, and the processing process of the coil conductor 3 can be simplified.
And in the outer side of the axial direction end surface 201 of the stator core 2, the coil end conductor part 32 of each phase can be arrange | positioned easily in the radial direction R, and the three-phase coil end conductor part 32 was put together. The coil end part 30 can be formed easily.

  Therefore, according to the stator 1 of this example, the dimension in the radial direction R of the coil end portion 30 in the stator 1 for a three-phase rotating electrical machine can be reduced without performing compression molding for flattening the coil end conductor portion 32. It can be easily reduced.

Explanatory drawing which shows the cross section of the standing conductor part in a coil conductor in an Example in the state seen from the axial direction end surface of the stator core. Sectional explanatory drawing which shows the cross section which cut | disconnected the stator in the circumferential direction the coil conductor of the U phase arrange | positioned in the slot of the U phase in an Example. Sectional explanatory drawing which shows the circumference | surroundings of the coil end conductor part in the U-phase coil conductor arrange | positioned in the slot of a U-phase in the Example in the cross section which cut | disconnected the stator in the circumferential direction. Explanatory drawing which shows typically the formation state of the U-phase coil conductor in an Example in the state seen from the axial direction end surface of the stator core. The explanatory view showing typically the arrangement state in the diameter direction of the coil end conductor part of the coil conductor of the U phase in the example as seen from the axial end surface of the stator core. Explanatory drawing which expand | deploys planarly and shows the arrangement | positioning state of the U-phase coil conductor with respect to the circumferential direction of a stator core in an Example. Explanatory drawing which expands a part and expand | deploys planarly the arrangement | positioning state of the U-phase coil conductor with respect to the circumferential direction of a stator core in an Example. Explanatory drawing which expands and shows the periphery of a standing conductor part in an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 2 Stator core 201 Axial end surface 21 Slot 3 Coil conductor 301 Conductive base material 302 Insulation coating 30 Coil end part 31 Slot conductor part 32 Coil end conductor part 33 Standing conductor part C Circumferential direction R Radial direction L Axial direction L1 Axial direction One side L2 The other side in the axial direction

Claims (7)

In a stator in which coil conductors are arranged in a distributed winding state in a plurality of slots in the stator core,
The coil conductor includes a slot conductor portion disposed in the slot in a state parallel to the axial direction of the stator core, and a coil end conductor portion disposed along the circumferential direction of the stator core outside the axial end surface of the stator core. Are connected by a rising conductor portion rising from the end surface in the axial direction of the stator core continuously from the slot conductor portion, and the coil end conductor portions are alternately arranged on one side and the other side in the axial direction of the slot conductor portion. It is formed in a wave shape that is connected multiple times and goes around the circumferential direction of the stator core,
The coil conductors are arranged on the stator core as a set of two,
In the two sets of coil conductors, the slot conductor portions are formed in a flat cross-sectional shape in which the thickness in the circumferential direction is smaller than the thickness in the radial direction, and are arranged in the circumferential direction in the slots. By being twisted by 90 °, the thickness in the radial direction is changed to a flat cross-sectional shape smaller than the thickness in the circumferential direction and arranged in the circumferential direction of the stator core, and the coil end conductor portions are arranged in the axial direction of the stator core. A stator characterized by   2. The rising conductor portion in the set of two coil conductors according to claim 1, wherein the rising conductor portions are twisted in opposite directions with the angular positions facing each other at either the inner or outer end in the radial direction. A stator characterized by In claim 2, the stator core is arranged with the three-phase coil conductors of U phase, V phase and W phase,
The rising conductor portion of any one of the three-phase coil conductors is twisted in opposite directions with the angular positions facing each other at the radially outer end portions as the fulcrum. Line up in the direction,
The rising conductor portion of any one of the other phases of the coil conductors of the three phases is twisted in opposite directions with the angular position facing each other at the radially inner end, Arranged in the circumferential direction of the stator core,
The rising conductor portion of the remaining phase of the coil conductor of the three phases is at one end in the circumferential direction that overlaps the coil end conductor portion of any other phase of the coil end conductor portion in the radial direction. Are arranged in the circumferential direction of the stator core by being twisted in opposite directions with the angular positions facing each other at the radially outer end as a fulcrum. The other end of the circumferential direction that overlaps the coil end conductor portion in the radial direction is twisted in opposite directions with the angular positions facing each other at the radially inner end as the fulcrum, thereby Line up in the circumferential direction,
The coil end conductor portion of any one of the phases is disposed on the outer peripheral side in the radial direction, and the coil end conductor portion of any one of the other phases is disposed on the inner peripheral side in the radial direction, and the coil end conductor of the remaining phase is disposed The stator is characterized in that the conductor portion is bent and arranged on the outer peripheral side and the inner peripheral side in the radial direction.   4. The two sets of coil ends arranged in the stator core according to claim 1, wherein the two sets of coil conductors arranged in the slots adjacent to each other in the stator core are arranged in the axial direction of the stator core. A stator in which conductor portions are further arranged side by side in the axial direction of the stator core to constitute a set of four coil end conductor portions. In claim 4, the stator core is arranged with the three-phase coil conductors of U phase, V phase and W phase,
The plurality of slots in the stator core include a U-phase slot in which the slot conductor portion in the U-phase coil conductor is disposed, a V-phase slot in which the slot conductor portion in the V-phase coil conductor is disposed, Two W-phase slots in which the slot conductor portions of the W-phase coil conductor are arranged are provided adjacent to each other in the circumferential direction of the stator core;
The two sets of coil conductors are in-phase coil conductors, and the four sets of coil end conductors arranged in the axial direction of the stator core are in-phase coil end conductors. Stator.   In claim 5, on the outside of the axial end face of the stator core, between the four sets of in-phase coil end conductors arranged in the axial direction of the stator core in the radial direction of the stator core, A stator having a coil end conductor portion of another phase of the set of four arranged side by side in the axial direction of the stator core. 7. A pair of 2 to which a set of four coil end conductor portions of any phase among the four sets of three phase coil end conductor portions arranged in the axial direction of the stator core are respectively connected. The set of upright conductor portions are aligned in the circumferential direction of the stator core by being twisted in opposite directions with the angular positions facing each other at the radially outer end portions as fulcrums,
A pair of two pairs of rising conductors, each of which is connected to a set of four coil end conductors of any other phase, are connected to each other at the corners facing each other at the radially inner ends. By being twisted in the opposite direction, aligned in the circumferential direction of the stator core,
A pair of two upright conductors connected to a set of four coil end conductors of the remaining phases are connected to the coil end conductors of any of the other phases. In one end portion of the circumferential direction that overlaps the direction, the angular positions facing each other at the outer end portion in the radial direction are twisted in opposite directions to each other as a fulcrum. At the other end in the circumferential direction where the coil end conductor portion overlaps the coil end conductor portion of any of the above phases in the radial direction, the opposite directions to each other with the angular position facing each other at the radially inner end portion Are aligned in the circumferential direction of the stator core,
One set of four coil end conductors of any of the above phases is arranged on the outer peripheral side in the radial direction, and one set of four coil end conductors of any of the other phases is on the inner peripheral side of the radial direction The stator is characterized in that the set of four coil end conductor portions of the remaining phases are bent and arranged on the outer peripheral side and the inner peripheral side in the radial direction.

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