JP6744059B1 - Stator of rotating electric machine and rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily permeate the whole conductor segment by applying a small amount of an impregnating material, prevent resonance vibration of a stator core, and at the same time, facilitate bending of the conductor segment in a twisting process. The coil end portion can be made smaller. A cylindrical stator core having a plurality of slots arranged in the circumferential direction, and two stator cores inserted in the slots and extending in the axial direction of the stator core from one end side and the other end side of the stator core. A plurality of conductor segments having projections and arranged in the radial direction of the stator core; and a plurality of conductor segments inserted in the slots are fixed by the impregnating material applied to the projections of the conductor segments. In the stator of a rotating electric machine, the conductor segment has an inclined portion whose cross-sectional area continuously changes from one end side to the other end side of the stator core, and the change in cross-sectional area of the two protrusions. Is a stator of a rotating electric machine, characterized in that it is different from the adjacent inclined portions. [Selection diagram]

Description

The present application relates to a stator of a rotating electric machine and a rotating electric machine including the stator.

A stator used in a rotary electric machine such as a vehicle AC generator has a structure in which a plurality of wound conductor segments are inserted into a plurality of slots arranged in the circumferential direction of a cylindrical stator core. There is.
This stator may induce resonance vibration of the stator core when the rotating electric machine is driven, and it is necessary to inject an impregnating material such as varnish into the slot to fix the stator core and the conductor segment. Is.

On the other hand, in the process of forming the stator winding, when twisting the coil end part of the conductor segment to move it to the joining position, the part of the conductor segment protruding from the stator core is gripped and twisted to form a conductor segment. Is disclosed.

JP, 2012-39719, A JP 2006-158045 A

In the stator of the conventional rotating electric machine, a large amount of impregnating material is required to firmly fix the stator core and the conductor segment to prevent resonance vibration. There was a problem that it adheres to unnecessary parts. Furthermore, when the coil end portion is twisted and moved to the joining position, a large twisting force is required, and after moving to the joining position, a force to return to the original position by springback is applied in reverse. If the twisted portion of the coil end portion is small, a large force is required for the twisting process, and there is also a problem that the coil end portion cannot be made small.

The present application has been made in order to solve the above problems, and by applying a small amount of impregnating material, the conductor segments are surely permeated to prevent the resonance vibration of the stator core, and at the same time, the twisting process is performed. The purpose of the present invention is to facilitate the bending of the conductor segment and reduce the coil end portion.

The stator of the rotating electric machine of the present application includes a cylindrical stator core having a plurality of slots arranged in the circumferential direction, and one end and the other end of the stator core inserted in the slots in the axial direction of the stator core. A plurality of conductor segments having two protrusions extending from the side and arranged in the radial direction of the stator core, and a plurality of conductor segments inserted into the slots by the impregnating material applied to the protrusions of the conductor segments. A stator of a rotating electric machine, in which a conductor segment is fixed, wherein the conductor segment has an inclined portion whose cross-sectional area continuously changes from one end side to the other end side of the stator core and has two protruding portions. The change in the cross-sectional area of is different from the slopes adjacent to each other.

Since the stator of the rotating electric machine of the present application has high permeability of the impregnating material into the slots of the stator core, the stator core and the conductor segments are securely fixed, and at the same time the resonance vibration of the stator core is prevented. In the step of twisting the conductor segment, the coil end portion can be made smaller by making the conductor segment easier to twist.

FIG. 3 is a cross-sectional view of the vehicle AC generator according to the first embodiment. FIG. 3 is a partial perspective view of the stator according to the first embodiment. FIG. 3 is a partial cross-sectional view of the stator according to the first embodiment. FIG. 4 is a manufacturing flow diagram of the stator according to the first embodiment. It is a block diagram of the conductor segment manufacturing apparatus which concerns on Embodiment 1. FIG. 3 is a cross-sectional view of a conductive material according to the first embodiment. FIG. 3 is a schematic view of a rectangular shaped portion of the conductive material according to the first embodiment. FIG. 6 is a diagram showing a process of processing a conductor segment according to the first embodiment. FIG. 3 is a plan view of a conductor segment according to the first embodiment. FIG. 6 is a diagram illustrating a twisting process of the conductor segment according to the first embodiment. FIG. 4 is a schematic cross-sectional view showing the impregnated material coating state of the stator according to the first embodiment.

In the description of the embodiments and each of the drawings, the parts denoted by the same reference numerals indicate the same or corresponding parts.

Embodiment 1.
The structure of the stator 9 will be described with reference to FIGS. 1 to 3.
FIG. 1 is a cross-sectional view showing the structure of a vehicle AC generator 100 to which the stator 9 according to the first embodiment is applied, and FIG. 2 is a partial perspective view showing a state in which a conductor segment 20 is inserted into the stator 9. It is a figure. FIG. 3 is a partial cross-sectional view showing the slot 11 of the stator core 10 into which the conductor segment 20 is inserted.

<Vehicle AC generator structure>
FIG. 1 is a cross-sectional view showing the structure of a vehicle AC generator 100 that is an example of a rotating electric machine. In the vehicle alternator 100, a rotor 5 attached to a rotary shaft 4 is arranged in a case 3 composed of a front bracket 1 and a rear bracket 2, and a stator 9 is provided so as to cover the outer peripheral side thereof. It has an attached structure.

The rotor 5 is composed of a pair of iron pole cores 6 and 7 and a rotor coil 8 wound around the pole cores 6, and current is passed through the rotor coil 8 to generate magnetic flux. The magnetic pole is formed by.
The stator 9 is composed of a stator core 10 formed of a cylindrical laminated core and a stator winding 13 wound around the stator core 10. The stator winding 13 has a front end on both ends thereof. A coil end portion 14a and a rear coil end portion 14b are formed.

2 and 3 illustrate the structure of the stator 9, FIG. 2 shows a part of the stator 9, and FIG. 3 shows a sectional structure of a part of the stator core 10.
As shown in FIGS. 2 and 3, the stator 9 of the first embodiment is a stator core made of a cylindrical laminated core in which a plurality of slots 11 extending in the axial direction are circumferentially formed at regular intervals. 10, a stator winding 13 wound around the stator core 10, and an insulator 21 installed in each slot 11 to electrically insulate the stator winding 13 and the stator core 10.

In the slot 11, four conductor segments 20 are arranged in a row in the radial direction from the inner peripheral side to the outer peripheral side to form the stator winding 13.
In the first embodiment, of the four conductor segments 20, two inside and two outside are connected.

The tips of the two conductor segments 20 to be connected are twisted so that the portions protruding from the end surface of the stator core 10 are in contact with each other, and are joined by welding or the like. Here, 96 slots 11 are formed at equal intervals in the stator core 10 so as to accommodate two sets of three-phase stator windings 13 described later, corresponding to the number of magnetic poles of the rotor 5. Has been done.

The conductor segment 20 is of two types: a normal conductor segment having the same length which occupies most of the conductor segment 20 and a lead conductor segment having a lead wire portion extended so as to connect to an output terminal portion or a neutral point. Can be divided into
The normal conductor segment has a portion to be inserted into the stator core 10 and a projecting portion 50 projecting from the stator core 10. The lead conductor segment, in addition to the structure of the normal conductor segment, includes an output terminal portion or a neutral point. In order to make a wire connection, the lead wire is usually extended to be longer than the conductor segment.
Although the structure of the stator 9 has been described for the vehicle AC generator, the stator 9 having the same structure can be used for a rotating electric machine such as a generator motor other than the vehicle AC generator.

<Stator manufacturing process flow>
An outline of the manufacturing process flow of the stator 9 will be described with reference to FIG.
Step S001
This is a manufacturing process of the conductor segment 20.
A copper conductive material 30 wound on a bobbin is used. The cross section of the conductive material 30 having a round cross section is crushed into a flat plate shape, and the insulating coating 32 at the end is peeled off. Further, in this step, the end portion is subjected to plastic working so as to make the shape easy to join by welding.
Since the manufacturing process of this conductor segment is an important process of the present application, it will be described in detail with reference to FIGS.

Step S002
This is a step of inserting an insulator into the stator core 10.
The end of the insulator 21 on the side where the conductor segment 20 is inserted is formed into a trumpet shape, which facilitates the insertion of the conductor segment 20. On the other hand, the other end has a flat shape.
Since the insulator 21 and the conductor segment 20 are inserted in the same direction, even when a large force is applied in the axial direction of the stator core 10 when the conductor segment 20 is inserted, the insulator 21 and the conductor segment 20 are stopped at the end surface of the stator core 10, and There is no displacement between 21 and the conductor segment 20.

Step S003
This is a step of inserting the conductor segment 20 into the stator core 10.
When inserting the conductor segment 20 into the slot 11 of the stator core 10, after bundling a certain number of normal conductor segments and lead conductor segments to be inserted in advance for each slot 11, the conductor segment 20 is inserted from one end side of the stator core 10. .. Since the tip end of inserting the conductor segment 20 into the stator core 10 has a notch portion, it can be smoothly inserted into the insulator 21 by being guided by the cross section of the notch portion.

The conductor segment 20 inserted into the slot 11 penetrates the slot 11 and is inserted into a holding portion provided on the conductor segment twisting jig installed in the other end side and used in the next step.
By inserting the conductor segment into the holding portion of the twist jig, the length of the conductor segment 20 protruding from the other end side of the stator core 10 can be made constant.

Further, the lead conductor segment of the conductor segment 20 is inserted into the slot 11 from the side opposite to the side to be connected in a later step. This makes it possible to adjust the length of the lead conductor segment protruding from the stator core 10 after the insertion so as to be the same as that of the other normal conductor segment and the lead conductor segment.

Step S004
This is a twisting process of the conductor segment 20.
First, the conductor segments 20 protruding from both end surfaces of the stator core 10 are held by a holding jig. In the case of a lead conductor segment on one end side, since there is a lead portion, the holding jig for the conductor segment 20 on one end side has a hole for allowing the lead portion to escape, and the lead portion is normally held at the same height as the conductor segment. It

Next, the holding jig is rotated to twist the conductor segment 20. At this time, the conductor segments 20 adjacent to each other in the slot 11 are twisted in the opposite directions to move the tips of the conductor segments 20 to be connected to the adjacent positions. In the above process, the conductor segments 20 on both sides are twisted, and the stator core in which the ends of the pair of conductor segments 20 have the same height is delivered to the welding process.
Since the manufacturing process of this conductor segment is also an important process of the present application, it will be described in detail with reference to FIG.

Step S005
This is a joining process using a laser welding machine.
The parts twisted up to the previous step are joined by welding using a laser welding machine.
Here, a process of joining the conductor segments 20 to each other will be described. In this method, a plurality of conductor segments 20 are used to join end portions of different conductor segments 20 to each other to form a rotary coil, and it depends on a shape of the conductor segment 20, a winding method, and the like. Sometimes the method is used.

The joining process has two steps.
The first step is an edge alignment step.
The two conductor segments 20 to be joined are held so that the side surfaces of the adjacent end portions of the conductor segments 20 are in contact with each other. In the step of aligning the end portions of the conductor segment 20, the stator 9 having the twisted ends is set, and the conductor segment 20 in the slot 11 is moved in the circumferential direction by using a conical taper pin. The ends of are retained. The conductor segment 20 to be joined has the insulating coating in a predetermined region removed from the tip portion.

The second step is a laser light irradiation step of irradiating two adjacent ends with laser light inclined at a predetermined angle to weld and join the ends of the conductor segment 20. Here, the laser beam is irradiated toward one of the two adjacent ends, and then the laser beam is moved to the other side.
By this laser light irradiation, one of the two adjacent end portions irradiated with the laser light is first melted. Since the gap between two adjacent end portions is minute, the molten conductor on one end face fills the gap between the other end portion and then moves the laser beam. As a result, the laser light moves from one end irradiated with the laser light to the other end, the other adjacent end melts, and the ends of the conductor segments 20 can be welded to each other.

In this step S005, the conductor segments 20 whose both ends are to be joined are arranged adjacent to each other so that the conductor segments 20 forming a pair have substantially no gap when twisted by the twisting machine in the previous step. Further, since the copper notch is formed on the surface opposite to the surface where the conductor segments 20 forming a pair are in contact with each other, heat is easily input during welding, and reduction of welding defects can be expected.
In this manner, by welding both the one end side and the other end side of the conductor segment, a three-phase electric circuit is formed.

Step S006
This is a wiring and connection process of the lead conductor segment.
After welding between the terminals of the conductor segment 20, the ends of the lead conductor segments are formed so as to be arranged at predetermined positions between the output line from the stator 9 and the neutral point of the Y connection or the interphase connection point of the delta connection. I do.

Step S007
This is a neutral point joining process.
A stator winding 13 which is a conductor segment assembly is formed by connecting a plurality of lead conductor segments by welding or the like.

Step S008
It is a powder coating process.
Powder coating is performed to insulate the welded part.
The conductor is exposed at the end portion of the conductor segment 20 welded in the previous step, and in this step, insulation treatment by an insulating member is also performed.

Step S009
This is the step of applying the impregnating material to the conductor segment 20.
An impregnation material 73 is applied to improve the vibration resistance of the conductor segments 20, the heat dissipation of the conductor segments 20 in the slots 11, and the insulation between the conductor segments 20.
Since this impregnating material applying step is also an important step of the present application, it will be described in detail with reference to FIG. 11 etc. after the entire manufacturing process flow is described.

<Step S001: Conductor segment manufacturing process>
The manufacturing process of the conductor segment 20 in step S001, which is an important process of the present application, will be described.
In this step, the copper conductive material 30 used for the conductor segment 20 is processed in shape, thickness, and the like. Alternatively, the corners are rectangular and the thickness is changed at the same time. Further, the insulating coating 32 is peeled off and cut in the same process.

FIG. 5 is a configuration diagram of a conductor segment manufacturing apparatus 101 used for processing the conductor segment 20. FIG. 6 shows a cross-sectional shape of the copper conductive material 30 supplied to the conductor segment manufacturing apparatus 101. As shown in the drawing, the copper conductive material 30 has a circular cross section, an insulating coating 32 on the outside, and a conductive portion on the inside. 31 is provided. FIG. 7 is a schematic view of the rectangular molding part 34 of the conductor segment manufacturing apparatus 101.

The conductive material 30 for the conductor segment is supplied from the left side of FIG. 5 and moves in the direction of arrow 28.
First, in the correction section 33 of the conductor segment manufacturing apparatus 101, the conductive material 30 is straightened to have a shape suitable for processing.
Next, in the rectangular molding portion 34, the round conductive material 30 is processed into a rectangular shape.

FIG. 7 shows a schematic view of the rectangular molding portion 34. The supplied conductive material 30 is sent from the back side of the paper toward the front side, and pressure is applied from the up and down direction and the left and right direction to the sending path, as indicated by an arrow 38, and thus the round shape is obtained. The conductive material 30 is made rectangular.
In FIG. 7, an example is shown in which the shape is a rectangular shape having a corner R, but the same effect can be obtained even if the corner is a right angle.

The rectangular conductive material 30 is fed to the coating peeling portion 36 via the conductive material feeding portion 35, and when cut into the individual conductor segments 20, the insulating coating 32 is peeled off at the positions of both ends. To do.
Finally, the conductive material cutting section 37 cuts at a predetermined cutting position, and the conductor segment manufacturing process is completed.

FIG. 8 is a view showing the forming process of the conductor segment 20, and is a cross-sectional view of the die part observed from the lateral direction with respect to the feeding direction of the rectangular forming part 34. The rectangular shaped portion 34 is for crushing the conductive material 30 into a rectangular shape to form the conductor segment 20. For convenience of description, the wire diameter of the conductive material 30 is described to be larger than the length. There is.
In FIG. 8, an arrow 48 indicates the feeding direction of the conductive material 30, and the lengths of the dies 40, 41, 42 of the rectangular molding portion 34 in the feeding direction are the total length of the stator core 10 and the stator core. The length of the first protrusion 50a and the second protrusion 50b at both ends of 10 is the same.

In FIG. 8, one conductor segment 20 shows a portion between two broken lines. After molding, the conductive material cutting unit 37 of the conductor segment manufacturing apparatus 101 cuts the broken line portion of FIG. 20 can be obtained.

The conductor segment 20 has a first inclined portion 61 whose cross-sectional area continuously decreases from the right side to the central portion in the drawing, and a second inclined portion 62 whose cross-sectional area continuously decreases from the left side to the central portion. doing. Further, it is located on the right side of the first inclined portion 61, and is located on the left side of the first protruding portion 50a and the second inclined portion 62 which are different in inclination state from the first inclined portion 61, and the second inclined portion The portion 62 has a second protruding portion 50b having a different inclination state. In addition, between the 1st inclination part 61 and the 1st protrusion part 50a, and between the 2nd inclination part 62 and the 2nd protrusion part 50b are the parts where inclination changes, and the inflection part 55. Call.

Here, the total length of the first inclined portion 61 and the second inclined portion 62 is substantially the same as or slightly longer than the length from the one end side to the other end side of the stator core 10, and the protruding portions at both ends. When the conductor segment 20 is inserted into the stator core 10, the portions 50a and 50b are portions protruding from one end side and the other end side of the stator core 10.

As shown in FIG. 8, the rectangular molding portion 34 includes a first die 40 forming a first inclined portion 61 of the conductor segment 20, a second die 41 forming a second inclined portion 62, and It is provided with three metal molds 40, 41, 42 of a third metal mold 42 integrally forming the first protrusion 50a and the second protrusion 50b.

In the processing of the conductor segment 20, in the portion where the conductive material 30 is pressed to make the conductor segment 20 thin, it is necessary to extrude the excess copper material from the mold to the outside.
Depending on the shape, it may not be able to be sufficiently pushed out to the outside, and the conductive material 30 after the rectangular molding may swell from the design value toward the center from the end.

In the conductor segment manufacturing apparatus 101, the conductive material 30 is molded in the rectangular molding portion 34, and then the conductive material feeding portion 35 feeds the conductive material 30 in the downstream direction (rightward in the drawing).
In the conductive material feeding unit 35, a clamp is arranged on the traveling stage along the feeding path, the conductive material 30 is fixed to this clamp, and the conductive material 30 is fed as the traveling stage moves.

In the coating stripping unit 36 of the conductor segment manufacturing apparatus 101, the coating stripping is performed on the conductive material 30 formed in a rectangular shape by using the two stripping units arranged in the circumferential direction.
In the first embodiment, as described above, the broken line portion in which the cross-sectional area of the conductive material 30 shown in FIG. 8 is large is cut by the conductive material cutting portion 37, and the cross-sectional area of the central portion is reduced. The conductor segment 20 can be obtained. The shape of the conductor segment 20 is an example, and the same applies to the conductor segment 20 having a large cross-sectional area at the central portion and the conductor segment 20 having a continuously increasing or decreasing cross-sectional area from one end side to the other end side. Can be used for.

FIG. 9 shows the conductor segment 20 obtained by the conductor segment manufacturing apparatus 101. 9A to 9C show an example of the conductor segment 20, in which the left and right ends are protrusions 50, 51, and 52, and the central portion of the conductor segment 20 indicates the inclination direction and inclination. The size is different.

Specifically, the protrusion 50 in FIG. 9A has a radial thickness that changes, and the cross-sectional area decreases toward the tip of the conductor segment 20. In FIG. 9B, the thickness in the circumferential direction changes, and the cross-sectional area becomes smaller toward the tip. Further, in FIG. 9C, a cut shape is formed. By using the protrusions 50, 51, and 52 shown in FIGS. 9A to 9C, the conductor segments 20 are bent and fixed with the protrusions 50, 51, and 52 as the starting points in the twisting step of the conductor segment 20 described later. Processing of the conductor segment 20 protruding from the child core 10 can be facilitated. Further, even if the protrusions 50, 51, 52 are short, the coil end of the stator 9 formed by twisting and welding the protrusions 50, 51, 52 of the conductor segment 20 can be easily twisted. The parts 14a and 14b can be lowered.

9(a) to 9(c) will be described in more detail below.
FIG. 9( a) is an observation of the conductor segment 20 with the radial direction of the stator core 10 being the vertical direction in the figure. Of the parts of the conductor segment 20 inserted into the stator core 10, one end side to the center The cross-sectional area of the first inclined portion 61 reaching the portion is small, and the cross-sectional area of the second inclined portion 62 extending from the other end side to the central portion is also small.
When inserted into the stator core 10, the protrusion 50 protruding from one end side and the other end side of the stator core 10 has a reduced radial thickness toward the end of the conductor segment 20 and a reduced cross-sectional area. The inclination of the conductor segment 20 is changed at the inflection portion 55 that is a boundary between the first inclined portion 61 and the second inclined portion 62 and the protruding portion 50.

FIG. 9( b) is an observation of the conductor segment 20 with the circumferential direction of the stator core 10 as the vertical direction in the figure, and the width of the conductor segment 20 in the circumferential direction of the portion inserted into the stator core 10. Has not changed. Although it cannot be seen from the figure, as in FIG. 9A, in the radial direction of the stator core 10, the cross-sectional area is small in the central portion of the conductor segment 20.
When the stator core 10 is inserted into the stator core 10, the projecting portions 51 projecting from one end side and the other end side of the stator core 10 have a circumferential thickness reduced toward the end portion of the conductor segment 20 and a reduced cross-sectional area. .. As a result, the state of inclination of the conductor segment 20 in the circumferential direction changes at the inflection portion 55.

FIG. 9C is also an observation in which the circumferential direction of the stator core 10 is taken as the vertical direction, and in the same manner as in FIG. 9B, the portion of the conductor segment 20 inserted into the stator core 10 has a circumferential direction. Although the width has not changed, when observed in the radial direction, the cross-sectional area of the first inclined portion and the second inclined portion becomes smaller toward the central portion.
A portion in which, when the stator core 10 is inserted, a cut shape is formed in the inflection portion 55 that is a boundary between the projecting portions 52 projecting from one end side and the other end side of the stator core 10, and the inclination in the circumferential direction changes. Have.

The first embodiment has been described using an example in which the cross-sectional area of the central portion of the conductor segment 20 inserted into the stator core 10 is reduced, but as described in the above description, the central portion The same effect can be obtained with the conductor segment 20 having a larger cross-sectional area and the conductor segment 20 having a cross-sectional area simply increasing or decreasing from one end side to the other end side.

<Step S004: Conductor segment drawing step>
The drawing process of the conductor segment 20 will be described with reference to FIGS.
After adjusting the length of the conductor segment 20 protruding from the other end side of the stator core 10 through the holding portion of the conductor segment drawing jig, the conductor segment on one end side is connected to the conductor segment on the one end side. Hold with a segment holding jig. In the case of a lead conductor segment, there is a lead part on one end side, so there is a hole in the conductor segment holding jig on one end side to allow the lead part to escape, and the lead part is usually at the same height as the end part of the conductor segment. Held in.
Next, as shown in FIG. 10A to FIG. 10B, the conductor segment twisting jigs on the one end side and the other end side are rotated in a predetermined direction, and the tips of the protruding portions 50 of the conductor segments 20 to be connected are adjacent to each other. Move to a suitable position. At this time, one end side and the other end side may be twisted one by one, or may be twisted at the same time.

At this time, the conductor segments 20 adjacent to each other, that is, the conductor segments 20 adjacent to each other in the radial direction of the stator core 10 are twisted so as to separate to the opposite side in the same slot 11, and therefore, they do not contact each other. Further, the conductor segments 20 located at the same position in the radial direction in the adjacent slots 11 are twisted in the same direction, but by changing their heights, a gap is created, and as a result, they do not contact each other. Even if they come into contact with each other, the surface is covered with the enamel for insulating coating, so that no short circuit occurs.

In the first embodiment, the conductor segment 20 includes the inflection portion 55 that is a boundary between the first inclined portion 61 and the second inclined portion 62 and the protruding portion 50 near the end surface of the stator core 10. When the conductor segment 20 is twisted, the projecting portion 50 of the conductor segment 20 can be deformed starting from the inflection portion 55, and fixed at a position closer to the stator core 10 than in the case where the inflection portion 55 is not provided. It can be bent with a small force that does not affect the child core 10 and the adjacent conductor segment 20.
As a result, the coil end portions 14a and 14b of the stator winding 13 to which the conductor segment 20 is connected can be made low and small, the resistance value of the stator winding 13 can be suppressed low, and the efficiency of the rotating electric machine can be improved. be able to.

<Step S009: Impregnating Material Application Step>
Next, the impregnating material applying step of step S009 will be described in detail with reference to FIG.
FIG. 11 is a schematic cross-sectional view of the stator 9 of the vehicular AC generator 100. The slot 11 part is shown so that the arrangement state of the plurality of conductor segments 20 inserted into the slot 11 of the stator core 10 can be seen. The cross section which cut|disconnected in the radial direction is shown.

In this description, an example using the conductor segment 20 shown in FIG. 9A is shown, but the present invention is not limited to this, and the structure shown in FIGS. 9B and 9C is used. The conductor segments 20 having other structures can also be used.

An insulator 21 is arranged in the slot 11 of the stator core 10, and a plurality of conductor segments 20 are arranged in the insulator 21 so as to overlap each other in the radial direction.
In the first embodiment, the conductor segment 20 is processed so that the cross-sectional area is small in the center, and when the conductor segment 20 is arranged in the slot 11, the cross-sectional area from the right end of the conductor segment 20 to the center is reduced. Is provided with a first inclined portion 61, and a second inclined portion 62 having a reduced cross-sectional area from the left end to the center.
Further, the conductor segment 20 has projecting portions 50a and 50b at both ends thereof, and the first inclining portion 61 and the projecting portion 50a, and the inflection portion 55 at the boundary between the second inclining portion 62 and the projecting portion 50b. ing.

The conductor segment 20 interconnects the projecting portions 50 projecting axially from the slot 11 portion of the stator core 10 and forms coil end portions 14a and 14b surrounded by broken lines. The impregnating material 73 is dropped onto the coil end portions 14a and 14b from the impregnating material discharge ports 71 of the two nozzles 70 arranged outside from both end surfaces of the stator core 10.
In the actual coating process, the cylindrical stator core 10 having the plurality of conductor segments 20 inserted in the slots 11 is rotated in the circumferential direction about its axis while the impregnating material 73 is applied to the coil end portions 14a and 14b. It can be dripped continuously.

The plurality of conductor segments 20 inserted into the slots 11 and arranged to overlap in the radial direction of the stator core 10 are arranged such that the first inclined portion 61 and the second inclined portion 61 and the second inclined portions 61 are arranged toward the center from both ends of the slot 11 as described above. Since it has the inclined portion 62 and the cross-sectional area becomes small in the central portion, the impregnating material 73 dropped on the coil end portions 14a and 14b efficiently enters the inside of the slot 11 in the direction of the arrow 72 indicating the permeation direction. Penetrates throughout and into paper insulators. As a result, the impregnating material 73 can permeate the entire conductor segment 20 with a small amount of the impregnating material 73, and the conductor segment 20 and the stator core 10 can be reliably fixed.

In the first embodiment, since the insulator 21 is arranged in the slot 11 and covers the conductor segment 20, when the impregnating material 73 is dropped while rotating the stator core 10 about its axis. However, although the insulator 21 is made of paper and penetrates, the impregnating material 73 does not spill around, and it is possible to prevent the impregnating material 73 from adhering to the periphery of the stator core 10.

As described above, by impregnating the impregnating material 73 between the conductor segments 20 in the slot 11, the insulation between the conductor segments 20 can be enhanced and resonance vibration can be suppressed. Further, the thermal conductivity from the conductor segment 20 to the stator core 10 is improved, and the temperature rise in the conductor segment 20 can be reduced.
Further, in the present embodiment, since the bent portion 55 is formed on the conductor segment 20 and the projecting portion 50 of the conductor segment 20 is easily bent in the twisting process of the conductor segment 20, the coil end portions 14a, 14b are formed. Can be lowered. Further, the resistance of the stator winding 13 can be reduced to improve the efficiency of the rotary electric machine.

Although the present application describes various exemplary embodiments and examples, various features, aspects, and functions described in one or more embodiments are not applicable to particular embodiments. The embodiments are not limited, and are applicable to the embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and at least one component is extracted and combined with the components of other embodiments.

1 front bracket, 2 rear bracket, 3 case, 4 rotating shaft, 5 rotor, 6 pole core, 7 pole core, 8 rotor coil, 9 stator, 10 stator core, 11 slots, 13 stator winding, 14a coil End part, 14b Coil end part, 20 Conductor segment, 21 Insulator, 28 Arrow, 30 Conductive material, 31 Conductive part, 32 Insulation coating, 33 Correcting part, 34 Rectangular forming part, 35 Conductive material feeding part, 36 Coating stripping part, 37 conductive material cutting part, 38 arrow, 40 1st metal mold, 41 2nd metal mold, 42 3rd metal mold, 50 protrusion part, 50a 1st protrusion part, 50b 2nd protrusion part, 51 protrusion Part, 52 protruding part, 55 inflection part, 61 first inclined part, 62 second inclined part, 70 nozzle, 71 impregnating material discharge port, 72 arrow, 73 impregnating material, 100 vehicle alternator, 101 conductor Segment manufacturing equipment.

Claims (12)

A cylindrical stator core having a plurality of slots arranged in the circumferential direction,
A plurality of conductors that are inserted into the slots and have two projecting portions that extend from one end side and the other end side of the stator core in the axial direction of the stator core and that are arranged in the radial direction of the stator core. And a segment,
A stator of a rotating electric machine, wherein the plurality of conductor segments inserted into the slot are fixed by an impregnating material applied to the protrusions of the conductor segments,
The conductor segment is
The inclined portion having a continuously changing cross-sectional area from one end side to the other end side of the stator core,
A stator of a rotating electric machine, wherein a change in cross-sectional area of the two protruding portions is different from that of the inclined portions adjacent to each other. The conductor segment has a first inclined portion whose cross-sectional area continuously decreases from one end side of the stator core toward the central portion,
The stator of the rotating electric machine according to claim 1, further comprising: a second inclined portion whose cross-sectional area continuously decreases from the other end side of the stator core toward the central portion. The conductor segment has a first inclined portion whose cross-sectional area continuously increases from one end side of the stator core toward the central portion,
The stator of the rotating electric machine according to claim 1, further comprising a second inclined portion whose cross-sectional area continuously increases from the other end side of the stator core toward the central portion. The change of the cross-sectional area of the said 1st inclination part and the said 2nd inclination part is a change of the magnitude|size with respect to the radial direction of the said stator core, The Claim 2 or Claim 3 characterized by the above-mentioned. Stator of rotating electric machine. The change of the cross-sectional area of the said 1st inclination part and the said 2nd inclination part is a change of the magnitude|size with respect to the circumferential direction of the said stator core, The claim 2 or claim 3 characterized by the above-mentioned. Stator of rotating electric machine. The two protrusions of the conductor segment are
The stator of a rotary electric machine according to claim 1, wherein the cross-sectional area continuously decreases toward the tip of the conductor segment. The two protrusions of the conductor segment are
The stator of a rotary electric machine according to claim 1, wherein the cross-sectional area continuously increases toward the tip of the conductor segment. The stator of a rotary electric machine according to claim 6 or 7, wherein the change in the cross-sectional area of the two protrusions is a change in the radial size of the stator core. The stator of a rotary electric machine according to claim 6 or 7, wherein the change in the cross-sectional area of the two protrusions is a change in the size of the stator core in the circumferential direction. The stator of a rotary electric machine according to claim 1, wherein the conductor segment has a rectangular cross-sectional shape. The stator of the rotary electric machine according to claim 1, further comprising an insulator provided between the conductor segment and the slot. A stator of the rotating electric machine according to any one of claims 1 to 11,
A rotary electric machine, which is rotatably attached to a rotary shaft, and is arranged on an inner diameter side of the stator.

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