WO2008044703A1

WO2008044703A1 - Stator of rotating electric machine

Info

Publication number: WO2008044703A1
Application number: PCT/JP2007/069743
Authority: WO
Inventors: Toshiyuki Yoshizawa; Masaya Inoue; Haruyuki Kometani
Original assignee: Mitsubishi Electric Corporation
Priority date: 2006-10-12
Filing date: 2007-10-10
Publication date: 2008-04-17
Also published as: JPWO2008044703A1

Abstract

Provided is a stator of a rotating electric machine, which can retain a predetermined slot sectional area to reduce the kinds of conductors of different sectional areas thereby to reduce the number of parts and to simplify the manufacturing steps. A slot (24) has first and second slot portions (24a and 24b) formed individually into rectangular sections and contiguously in radial directions such that their circumferential widths are formed into two-step shapes made wider stepwise outward of the radial direction. In the first and second slot portions (24a and 24b), slot housing portions of two continuous conductor lines (31A and 31B) are juxtaposed radially in one row. The slot housing portions of the continuous conductor lines (31A and 31B) have their circumferential widths corresponding to the circumferential widths of the first and second slot portions (24a and 24b) for housing the slot housing portions. The slot housing portions of the continuous conductor lines (31A and 31B) have their radial lengths corresponding to the lengths, which are calculated by dividing the radial lengths of the first and second slot portions (24a and 24b) for housing the slot housing portions, by the number of the slot housing portions housed.

Description

Specification

Rotating electric machine stator

Technical field

TECHNICAL FIELD [0001] The present invention relates to a stator of a rotating electrical machine such as a vehicular AC generator, and more particularly to a slot shape of a stator core.

Background art

[0002] A vehicular AC generator, which is a type of vehicular rotating electrical machine, is driven by the rotational torque of an engine being transmitted from a crank shaft to a pulley via a belt. In recent years, with the electrification of vehicle devices, it is desired to improve the output and increase the efficiency of the generator. In order to improve the output and increase the efficiency, it is necessary to reduce the resistance of the stator winding with a large loss. In order to reduce the resistance of the stator winding, it is necessary to increase the cross-sectional area of the slot that houses the strands of the stator winding. A means for increasing the cross-sectional area of the slot is to increase the slot depth in the radial direction or to increase the width of the slot in the circumferential direction.

[0003] However, increasing the width of the slot reduces the width of the teeth that are magnetic circuits. And if the width | variety of a tooth | gear becomes narrow, the magnetic flux density which passes a tooth | gear will go up and the electric power generation amount will fall by magnetic saturation.

On the other hand, when the slot width is constant (parallel slot shape) and the slot depth is increased, the slots are arranged in the circumferential direction with the depth direction aligned with the radial direction. It becomes a fan shape that gradually widens outward in the direction. For this reason, the magnetic flux density decreases as it goes to the outer periphery of the teeth where the magnetic flux density is high near the inner periphery of the teeth, resulting in an unbalance of the magnetic flux density, and the magnetic flux density design cannot be optimized.

[0004] It is effective to increase the slot depth by keeping the teeth width constant (parallel teeth shape). In this case, it becomes a fan-shaped obstacle for a rotating electric machine of 100 to several hundreds V like an industrial machine, in which the slot width is gradually increased outward in the radial direction. In other words, in industrial machines, the current itself is so large that the number of windings is large, so the wires themselves are bundled together to form a coil. So even if the slot shape changes The bundle-like wires are appropriately arranged in the shape of a slot, and the space factor, which is the ratio of the wires to the cross-sectional area of the slot, can be increased.

[0005] However, in the AC generator for a vehicle, the parallel teeth shape causes a serious problem. In other words, in an AC generator for vehicles, a large current exceeding 100A flows at a voltage as low as 12 to 14V, so that the strands become as thick as φ; The slot width is also about the same as the wire thickness. Furthermore, because it is premised on the best production, the design of a bundle of strands as in the industrial machine is not realized. Therefore, it becomes difficult to wind a wire consisting of a thick continuous wire around the slot, and the space factor cannot be increased.

[0006] In view of such a situation, U-shaped conductor segments are used as the strands, and the conductor segments are housed in a row in the radial direction in a fan-shaped cross-sectional slot having parallel teeth. In this conventional vehicle alternator, each conductor segment is formed in a different cross-sectional shape so that the cross-sectional shape of the entire conductor segment aligned in a row matches the fan-shaped cross-sectional shape of the slot, and the space factor is increased. (For example, see Patent Document 1).

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2004-159460

Disclosure of the invention

Problems to be solved by the invention

[0008] As described above, in the conventional stator for a vehicle alternator, it is necessary to prepare conductor segments having different cross-sectional shapes corresponding to the radial positions in the slots. In addition, in this type of vehicle alternator stator, the slot accommodating portions, which are usually a part of 4 to 8 conductors, are arranged in a row in the radial direction in the slot.

For this reason, for example, when an 8-turn winding is produced in a conventional stator for an automotive alternator, eight types of conductor segments having different cross-sectional shapes are required, which increases the number of parts and the production process. There is a problem that becomes complicated.

[0009] The present invention has been made to solve such a problem. A slot portion having a rectangular cross section is continuously provided so that the circumferential width is increased stepwise outward in the radial direction. The slot cross-sectional area of each slot can be secured, and the slot storage section corresponding to each slot can be stored to reduce the types of conductors with different cross-sectional areas, thereby reducing the number of parts and simplifying the production process. It aims at obtaining the stator of a rotary electric machine. Means for solving the problem

[0010] A stator of a rotating electrical machine according to the present invention includes a cylindrical stator core in which slots are arranged at a predetermined pitch in the circumferential direction with openings facing the inner periphery, and a plurality of conductors are part of the conductor. And a stator winding comprising a plurality of windings wound around the stator core with a certain slot storage portion being housed in the slot. The slot has a shape having a plurality of steps in which a plurality of slot portions each having a rectangular cross section are continuously provided in the radial direction, and the circumferential width of each of the slot portions is increased stepwise outward in the radial direction. In each of the slot portions, an even number of the slot storage portions are stored in a line in the radial direction. The circumferential width of the slot accommodating portion corresponds to the circumferential width of the slot portion in which the slot accommodating is accommodated, and the radial length of the slot accommodating portion is the slot portion in which the slot accommodating portion is accommodated. Corresponds to a length obtained by dividing the radial length by the number of the slot accommodating portions accommodated in the slot portion.

The invention's effect

[0011] According to the present invention, since the circumferential width of the slot is formed in a shape having a plurality of steps that increase stepwise outward in the radial direction, the parallel slot having a constant circumferential width in the radial direction is formed. Compared with a slot having a shape, a large slot cross-sectional area can be secured. In addition, the circumferential width of the slot accommodating portion corresponds to the circumferential width of the slot accommodating the slot accommodating portion, and the radial length of the slot accommodating portion is the diameter of the slot accommodating the slot accommodating portion. Corresponding to the length obtained by dividing the direction length by the number of slot storage parts stored in the slot part, while ensuring a large space factor, the type of conductor with a different cross-sectional area is the number of slots The number of parts can be reduced and the production process is simplified.

Brief Description of Drawings

FIG. 1 is a cross-sectional view schematically showing an automotive alternator mounted with a stator according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing a stator of the automotive alternator according to Embodiment 1 of the present invention.

FIG. 3 is an enlarged cross-sectional view of a relevant part for explaining the configuration of the stator of the automotive alternator according to Embodiment 1 of the present invention. FIG. 4 is an enlarged cross-sectional view of a main part for explaining the configuration of the stator core of the automotive alternator according to Embodiment 1 of the present invention.

FIG. 5 is a diagram showing the relationship between a parameter k that defines the slot position of the slot in the stator core of the automotive alternator according to Embodiment 1 of the present invention and the slot cross-sectional area.

FIG. 6 is a side view showing a spring assembly constituting the stator winding of the automotive alternator according to Embodiment 1 of the present invention.

FIG. 7 is a process diagram illustrating a method for manufacturing the stator of the automotive alternator according to Embodiment 1 of the present invention.

FIG. 8 is a connection diagram of a three-phase AC winding constituting a stator winding in a stator of a vehicle AC generator according to Embodiment 2 of the present invention.

FIG. 9 is an enlarged cross-sectional view of a main part for explaining the configuration of the stator of the automotive alternator according to Embodiment 3 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1.

FIG. 1 is a cross-sectional view schematically showing an automotive alternator on which a stator according to Embodiment 1 of the present invention is mounted, and FIG. 2 shows an automotive alternator according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing a stator, FIG. 3 is an enlarged cross-sectional view of a main part illustrating the configuration of the stator of the vehicle alternator according to Embodiment 1 of the present invention, and FIG. 4 is a diagram according to Embodiment 1 of the present invention. It is a principal part expanded sectional view explaining the structure of the stator core of the alternating current generator for vehicles. In FIG. 2, for convenience of explanation, the conductor joints are omitted.

[0014] In Figs. 1 to 4, the vehicle alternator 1 includes a case 4 composed of a substantially bowl-shaped aluminum front bracket 2 and a rear bracket 3, and a shaft 5 that is connected to the case 4 via a bearing. The rotor 6 rotatably supported in the case 4, the pulley 9 fixed to the end of the shaft 5 extending to the front side of the case 4, and the axial direction of the rotor 6 The fan 10 fixed to both end faces of the rotor, the stator 20 having a fixed gap with respect to the rotor 6, surrounding the outer periphery of the rotor 6, and fixed to the case 4, and the rear side of the shaft 5 A pair of slip rings 11 that supply current to the rotor 6, and a pair of brushes 12 that are disposed in the case 4 so as to slide on the slip rings 11. In addition, occurred in the stator 20 A rectifier 13 that rectifies alternating current into direct current, a voltage regulator 14 that adjusts the magnitude of the alternating voltage generated by the stator 20, and the like are disposed in the case 4.

The rotor 6 includes a field coil 7 that generates a magnetic flux when an excitation current is passed, a pole core 8 that is provided so as to cover the field coil 7, and a magnetic pole is formed by the magnetic flux, and a shaft 5. And. The pole core 8 is fixed to a shaft 5 penetrating at the axial center position.

[0016] The stator 20 is wound around a cylindrical stator core 21 and the stator core 21, and a stator winding in which an alternating current is generated by a change in magnetic flux from the field coil 7 as the rotor 6 rotates. Line 25.

The stator core 21 is arranged in an annular core back 22 and a predetermined pitch in the circumferential direction on the inner peripheral side of the core back 22 and extends radially inward from the inner peripheral side of the core back 22 respectively. A plurality of teeth 23 are provided, and a plurality of slots 24 that are open to the inner peripheral side are formed by the core back 22 and the adjacent teeth 23.

Each tooth 23 has a fan shape having an inner circumferential side circumferential width X and an outer circumferential side circumferential width X.

1 2

A first tooth portion 23a on the inner circumferential side, and an inner circumferential side circumferential width X and an outer circumferential side circumferential width X.

3 4 is formed in a two-stage shape that also acts as a force with the second tooth portion 23a connected to the outer peripheral side from the first tooth portion 23a. Therefore, each slot 24 has a first slot portion 24a on the inner circumferential side having a parallel slot shape having a circumferential width a and a parallel slot shape having a circumferential width b, and the outer circumferential side from the first slot portion 24a. It is formed in a two-stage shape comprising a second slot portion 24b provided continuously to the!

In each slot 24, continuous conductor wires 31A and 31B as four conductors constituting the stator winding 25 are accommodated in a line in the radial direction. The first slot portion 24a accommodates a slot accommodating portion 32a that is a part of the first continuous conductor wire 31A formed in two rectangular cross sections, and the second slot portion 24b includes two slots. A slot accommodating portion 32b, which is a part of the second continuous conductor wire 31B formed in a rectangular cross section, is accommodated.

[0019] Here, the number of slots is ns, the radius of the inner periphery and the outer periphery of the first slot portion 24a is r, r,

1 2

2 If the radius of the outer periphery of the slot 24b is r, the first teeth 23a and the second teeth

Three

Each dimension X, X, X, X of part 23b is expressed by the following formula. X = (2 π Γ / — a

1 1

X = (2 π Γ / Zns) — a

twenty two

X = (2 π Γ / Zns) b

3 2

X = (2 π Γ / Zns) b

4 3

The size relationship between dimensions x, X, X, and X is X = X, X> X, and X> x

1 2 3 4 1 3 4 3 2 1

Yes

[0020] Generally, in the case of a tooth having a fan shape in which the circumferential width gradually increases outward in the radial direction, the magnetic flux density decreases toward the outer periphery of the tooth where the magnetic flux density increases near the inner periphery of the tooth. . In other words, the amount of magnetic flux passing through the teeth is determined by the circumferential width on the inner peripheral side of the teeth. Therefore, the circumferential width on the inner circumference side of the teeth is determined so that a desired power generation amount can be obtained. The circumferential width on the inner circumference side of this tooth is X. At this time,

1

The mouthpiece has a flat fi slot shape.

On the other hand, in the case of parallel teeth in which the circumferential width is always constant in the radial direction, the magnetic flux density of the teeth is constant in the radial direction. Therefore, the circumferential width of this parallel tooth is X and

1 becomes. At this time, the slot has a fan-shaped slot shape.

[0021] In this tooth 23, the magnitude relation of the dimensions X 1, X 2, X 3, X is expressed by X = x, X> x, and x>

1 2 3 4 1 3 4 3 2 x. Therefore, this tooth 23 has an imbalance at the radial position of the magnetic flux density.

1

The amount of magnetic flux equivalent to that of the teeth constituting the above-described parallel slot shape and the teeth constituting the fan-like slot shape is allowed to be minimized. Further, the slot cross-sectional area of the slot 24 can be larger than the slot cross-sectional area of the parallel slot shape, and can approach the slot cross-sectional area of the fan-shaped slot shape.

[0022] Since the slot 24 is composed of first and second slot portions 24a and 24b having a rectangular cross section, the slot accommodating portions 32a and 32b of the first and second continuous conductor wires 31A and 31B to be accommodated are provided. It is easy to form a rectangular cross section that matches the cross sectional shape of the first and second slot portions 24a and 24b. That is, the circumferential width of the slot housing portion 32a is made to correspond to the circumferential width of the first slot portion 24a, and the radial length is divided by the number of housings (here, 2) the radial length of the first slot portion 24a. The cross-sectional shape of the slot accommodating portion 32a is formed so as to correspond to the length. Similarly, the circumferential width of the slot accommodating portion 32b is made to correspond to the circumferential width of the second slot portion 24b, and the radial length is set to the second length. The cross-sectional shape of the slot accommodating portion 32b is formed so as to correspond to the length obtained by dividing the radial length of the slot portion 24b by the number of accommodating portions (here, 2). Therefore, useless space between the slot 24 and the slot accommodating portions 32a and 32b of the first and second continuous conductor wires 31A and 31B can be reduced, and the space factor can be increased.

[0023] In addition, the first slot portion 24a stores the slot storage portions 32a of the two first continuous conductor wires 31A having the same cross-sectional shape, and the second slot portion 24b includes two slots having the same cross-sectional shape. The slot portion 32b of the second continuous conductor wire 31B is accommodated. Therefore, since the four-turn stator winding 25 can be manufactured using the two types of first and second continuous conductor wires 31A and 31B, the number of parts can be reduced and the production process can be simplified.

As described above, according to the first embodiment, even if the thick first and second continuous conductor wires 31A and 31B are used, the cross-sectional area of the slot 24 can be increased without sacrificing productivity. Is possible. Therefore, copper loss generated in the stator winding 25 is reduced, and a highly efficient vehicle alternator is realized, which can contribute to improvement of vehicle fuel efficiency.

In addition, the stator winding 25 is cooled by the rotation of the fan 10 fixed to the rotor 6. Since the copper loss generated in the stator winding 25 can be reduced, the air volume for cooling the stator winding 25 can be reduced, and the small size fan 10 can be used. As a result, noise caused by fan 10 can be reduced.

[0025] Further, since this vehicle alternator is driven by the rotational torque of the engine transmitted to the pulley 9 through the belt, a large noise is generated due to the variation in the belt, or The belt life is shortened. Therefore, it is desirable to reduce the rotor 6's moment of inertia by reducing the diameter of the rotor 6 in order to solve the problems of noise and belt life caused by belt variations. If the diameter of the rotor 6 is reduced, the number of turns of the field coil 7 is reduced and the required field magnetomotive force cannot be obtained. According to the first embodiment, since the slot 24 is configured in a two-stage shape including the first and second slot portions 24a and 24b, the rotor core 21 has a portion corresponding to the reduced diameter of the rotor 6. By reducing the inner diameter, the cross-sectional area of the slot 24 can be increased while minimizing the imbalance of the core magnetic flux density at the radial position. Therefore, even if the diameter of the rotor 6 is reduced, the cross-sectional area of the first and second continuous conductor wires 31A, 31B can be increased and the winding resistance of the stator winding 25 can be reduced. A reduction in output caused by reducing the diameter can be suppressed, and a vehicle AC generator with low noise and a long belt life can be realized.

Next, a method for setting the step position of the slot 24 will be described. That is, the first slot 2

By changing the radial position of the boundary line between 4a and the second slot portion 24b, the slot S can be adjusted with the force S.

[0027] First, the slot cross-sectional area S is expressed by equation (1).

S = a (r -r) + b (r -r) (Equation 1)

2 1 3 2

The parameter k that defines the step position is the ratio of the slot depth (radial length) of the first slot portion 24a to the slot depth (radial length) of the slot 24, and is expressed by the following equation.

k = (r -r) / (r -r) (0 <k <l)

2 1 3 1

r ₂ is expressed by the following equation from the above equation.

r = r + k (r- r)

2 1 3 1

The relationship between the circumferential width a of the first slot portion 24a and the circumferential width b of the second slot portion 24b is expressed by the following equation.

b = m-a (where m mno

Here, Equation (2) is derived from the constraint of X = x.

= (27r / ns) k (r- r) + a (3)

3 1

Substituting b and r into equation (1) leads to equation (4).

S = a (r- r) (k + m- mk) (4)

3 1

Erasing m from equation (4) leads to equation (5).

S = r- r) {ak + (27r / ns k (r- r) + a- (2 兀 / ns) k r- r) k- ak}

3 1 3 1 3 1

= (r -r) [-(2π / η _δ ) (r-one r) {k-one (1/2)} ² + a + (π / ns) (r-one r) / 2]

3 1 3 1 3 1

... (Formula 5)

[0030] Here, there is a stepless parallel slot shape where the slot cross-sectional area S represented by Equation 5 and the circumferential width a are a. Figure 5 shows the relationship between the area ratio (S / S) and the slot cross-sectional area S.

0 0

From Fig. 5, the slot cross-sectional area S expressed by Equation 5 is an upwardly convex curve when k = 0.5. If k is greater than 0.2 and less than 0.8, the slot cross-sectional area S is compared to the slot cross-sectional area S of a parallel slot shape having a circumferential width a.

0

Can be expanded by more than 10%. In other words, it is desirable to set k greater than 0.2 and less than 0.8.

[0031] Next, a method for manufacturing the stator 20 will be described.

First, first and second winding assemblies 30A and 30B shown in FIG. 6 are prepared. The first winding assembly 30A shown in FIG. 6 (a) is produced, for example, by continuously supplying twelve continuous conductor wires 31A to a winding forming apparatus (not shown) at the same time. Then, the twelve continuous conductor wires 31A are collectively bent and formed by the winding forming device in a state of being arranged at a 1-slot pitch. This first winding assembly 30A is arranged in a number of slots at a pitch of 1 slot with a pair of linear slot accommodating portions 32a adjacent to each other in the direction orthogonal to the middle sheet surface of FIG. The end portions of the slot accommodating portion 32a apart from the slot are connected by a turn portion 33a. Then, six end portions 31a of the twelve continuous conductor wires 31A are extended to both ends on both sides of the first winding assembly 30A. Here, the continuous conductor wire 31A is made of an insulation-covered copper wire, and has a side having a length substantially equal to the circumferential width of the first slot portion 24a and the radial length of the first slot portion 24a. It is made into a rectangular cross-section consisting of sides with a length approximately equal to the length divided by.

[0032] Similarly, the second winding assembly 30B shown in (b) of Fig. 6 is produced by simultaneously and continuously supplying twelve continuous conductor wires 31B to the winding forming apparatus. Then, the twelve continuous conductor wires 31B are collectively bent and formed by a winding forming apparatus in a state of being arranged at a one-slot pitch. This second winding assembly 30B is arranged by the number of slots at a 1-slot pitch of the linear slot accommodating portion 32b adjacent in the direction orthogonal to the (b) middle page of FIG. 6 and separated by 6 slots. Further, the end portions of the slot storage portion 32b are connected by a turn portion 33b. Then, six end portions 31b of the twelve continuous conductor wires 31B are extended to both ends of the second winding assembly 30B. Also, at the time of bending, the supply amount of the corresponding continuous conductor wire 31B is increased at a predetermined time, and the conductor end 34 that is bent and formed in the subsequent process is connected to the second winding. It extends from the turn part 33b of the assembly 30B. Here, the continuous conductor wire 31B is made of an insulation-covered copper wire, and has a side having a length substantially equal to the circumferential width of the second slot portion 24b and a radial length of the second slot portion 24b of 2. It is made into a rectangular cross-section consisting of sides with a length approximately equal to the length divided by.

[0033] Then, the magnetic steel plate is press-molded to produce a belt-like magnetic plate having a teeth portion, a slot portion, and a core back portion. Then, the teeth portion, the slot portion, and the core back portion are overlapped and a predetermined number of magnetic plates are laminated and integrated to produce a rectangular parallelepiped laminated core 35. As shown in FIG. 7 (a), the laminated iron cores 35 are arranged at a predetermined pitch in the length direction of the core back 35a and the core back 35a, and each of the teeth extends from the core back 35a to one side. 35b, and a slot 35c including a core back 35a and an adjacent tooth 35b.

Next, as shown in FIG. 7 (b), the first and second winding assemblies 30A and 30B are laminated, and the laminated core 35 is bent toward the core back 35a to expand the opening of the slot 35c. Then, the slot storage portions 32a and 32b are inserted into the slots 35c. Thereafter, as shown in FIG. 7 (c), bending of the laminated core 35 toward the core back 35a is stopped, and the first and second winding assemblies 30A, 30B are mounted on the laminated core 35.

Next, the laminated iron core 35 is bent into a cylindrical shape, both end faces of the bent laminated iron core 35 are butted, and the butted portions are welded to produce a cylindrical stator core 21. Thus, the first winding assembly 30A is wound around the first slot portion 24a of each slot 24, and the second winding assembly 30B is wound around the second slot portion 24b of each slot 24. ing. In each slot 24, four slot storage portions 32a and 32b are stored in a line in the radial direction. After that, the end portions 31a and 31b of the continuous conductor wires 31A and 31B are joined together, and further, the respective windings are connected using the conductor end portion 34, so that a stator winding 25 composed of a desired three-phase AC winding is manufactured. The stator 20 shown in FIG. 2 is obtained.

[0036] Each winding composed of the continuous conductor wire 31A wound around the first slot portion 24a is folded back outside the slot on the end face side of the stator core 21, and the first slot every six slots. In the portion 24a, the inner layer and the outer layer are alternately wound in the slot depth direction. Similarly, each winding composed of the continuous conductor wire 31B wound around the second slot portion 24b is folded back outside the slot on the end face side of the stator core 21, and the second slot portion every six slots. Slot in 24b The inner layer and the outer layer are wound alternately in the depth direction.

[0037] As described above, since the stator winding 25 is manufactured using the continuous conductor wires 31A and 31B, compared with the case where the U-shaped conductor segment is used, the number of joints is remarkably reduced, and the stator winding 25 is formed. 20 productivity can be improved.

Also, first and second winding assemblies 30A and 30B are manufactured using a predetermined number of continuous conductor wires 31A and 31B, and the first and second winding assemblies 30A and 30B are stacked to form a rectangular parallelepiped laminated core 3 Since it is attached to 5, it is measured by simply winding the thick continuous conductor wires 31A and 31B around the slot 24.

Further, when the first and second winding assemblies 30A and 30B are mounted on the rectangular parallelepiped laminated core 35, the laminated core 35 is bent toward the core back 35a, and the opening of the slot 35c is expanded. The first and second winding assemblies 30A and 30B can be easily attached to the laminated core 35, and the occurrence of damage to the insulating coating of the continuous conductor wires 31A and 31B during the attachment is suppressed.

[0038] In Embodiment 1 described above, the number of slots is formed at a ratio of 2 per pole per phase, and V, the stator core is described as! /, And the force is the number of slots. Is not limited to the stator core formed at a rate of 2 per phase per pole. For example, the number of slots may be a stator core formed at a rate of 1 per phase per pole. Good. In this case, the first and second winding assemblies 30A and 30B are manufactured using six continuous conductor wires 31A and 31B, respectively.

[0039] In the first embodiment, each phase winding of the force stator winding described as being composed of windings of each phase winding force turn of the stator winding has 4 turns. For example, each phase winding may be composed of 8 turns. In this case, the two second winding assemblies 30B are overlapped and stored in the second slot portion 24b of each slot 24, and the two first winding assemblies 30A are overlapped in the first slot portion 24a of each slot 24. Just store it. Alternatively, three second winding assemblies 30B are stacked and stored in the second slot portion 24b of each slot 24, and one first winding assembly 30A is stacked and placed in the first slot portion 24a of each slot 24. May be stored. In this way, an 8-turn stator winding can be produced using two types of continuous conductor wires 31A and 31B.

[0040] Thus, the first and second slot portions 24a, 24b of the present application, that is, the slot portions of each stage, Slot storage parts for an even number of continuous conductor wires are stored in a line. Further, the number of slot storage portions stored in the slot portions of each stage is not necessarily the same.

[0041] In the first embodiment, the force S is assumed to use the first and second continuous conductor wires 31A and 31B prepared in advance in a rectangular cross section, and the cross section of the continuous conductor wire is not limited to the rectangular cross section. For example, the cross section may be circular. In this case, a first winding assembly is produced using a continuous conductor wire having a circular cross section having a cross sectional area obtained by dividing the cross sectional area of the first slot portion 24a by the number of stored parts, and a press jig or the like is used. If the slot storage part is molded into a rectangular cross section, Similarly, a second winding assembly is manufactured using a continuous circular conductor wire having a cross-sectional area obtained by dividing the cross-sectional area of the second slot portion 24b by the number of housings, and a press jig or the like is prepared. The slot storage part may be formed into a rectangular cross-section using this method.

[0042] Embodiment 2.

In the second embodiment, as shown in FIG. 8, the three-phase AC winding of the stator winding 25A is configured by ΔΥ mixed connection. The winding 36 composed of the first continuous conductor wire 31A accommodated in the first slot portion 24a is Δ-connected and accommodated in the second slot portion 24b having a larger cross-sectional area than the first slot portion 24a. Winding 37 consisting of the second continuous conductor wire 31B is Y-connected.

Other configurations are the same as those in the first embodiment.

[0043] In the ΔΥ mixed connection, a current value (peak value) that is three times the current value flowing in the Δ connection portion flows in the Y connection portion. In the second embodiment, the number of conductors accommodated in the first and second slot portions 24a and 24b is equal, and the slot sectional area of the second slot portion 24b is greater than the slot sectional area of the first slot portion 24a. It is getting bigger. Since the winding 37 composed of the second continuous conductor wire 31B housed in the second slot portion 24b having a large slot cross-sectional area is Y-connected, the Y-connection portion constituting the Y-connection portion through which a large current flows is formed. 2 The resistance of the continuous conductor wire 31B is reduced, and the increase in the amount of heat generated at the Y connection is suppressed. In addition, since the surface area of the second continuous conductor wire 31B is increased, the heat generated in the Y connection portion is effectively dissipated to the cooling wind from the turn portion 33b of the second continuous conductor wire 31B, and an excessive temperature is generated in the Y connection portion. The rise is suppressed.

[0044] Here, ideally, the number of turns in the Δ connection section: the number of turns in the Y connection section = ^ 3: 1, and the current value flowing through the Δ connection section and the current value flowing through the Y connection section are balanced. I hope to do it. Shi However, since the number of turns is an integer, the current value flowing through both cannot be balanced by the number of turns.

Therefore, in the second embodiment, k is set so as to satisfy the cross-sectional area of the first slot portion 24a: the cross-sectional area of the second slot portion 24b = 1: ^ 3, and is stored in the first slot portion 24a. The winding 36 composed of the first continuous conductor wire 31 A is Δ-connected, and the winding 37 composed of the second continuous conductor wire 31B stored in the second slot 24b is Y-connected. Also good. In this case, the current value flowing through the Δ connection portion and the current value flowing through the Y connection portion can be balanced.

[0045] In the second embodiment, the second continuous conductor wire 31B accommodated in the second slot portion 24b has a sectional area of the second slot portion 24b larger than the sectional area of the first slot portion 24a. Force for connecting Y of the windings 37 to be configured The first continuous conductor wire 31A accommodated in the first slot portion 24a by making the cross-sectional area of the first slot portion 24a larger than the cross-sectional area of the second slot portion 24b You can Y-wind winding 36, which consists of!

Further, k is set so as to satisfy the cross-sectional area of the first slot portion 24a: the cross-sectional area of the second slot portion 24b = ^ 3: 1, and the first continuous conductor wire accommodated in the first slot portion 24a. Winding 36 composed of 31A may be Y-connected and winding 37 composed of second continuous conductor wire 31B housed in second slot 24b may be Δ-connected! /.

[0046] In the second embodiment, the number of the slot accommodating portions of the conductor wires accommodated in the two slot portions is equal, and when the slot sectional area is large, the conductor portions are accommodated in the slot portion! / The winding composed of the conductor wire is Y-connected, and the slot cross-sectional area is small! / The winding composed of the conductor wire accommodated in the slot is Δ-connected. As a result, the resistance value of the Y-connected winding is smaller than the resistance value of the Δ-connected winding.

In the present invention, the number of the slot accommodating portions accommodated in the two slot portions is not necessarily the same. That is, the number of slot storage portions of the conductor wire stored in one slot portion is less than or equal to the number of slot storage portions of the conductor wire stored in the other slot portion, and is stored in one slot portion. If the conductor cross-sectional area of the slot storage section is larger than the conductor cross-section area of the slot storage section stored in the other slot section, the winding composed of the conductor wires stored in one slot section! Y-connect the wire, and ∆-connect the winding made up of the conductor wire stored in the other slot! In this case! /, Even so, the resistance value of the Y-connected winding is smaller than the resistance value of the Δ-connected winding, and an increase in the amount of heat generated in the Υ-connected portion is suppressed.

[0047] Embodiment 3.

In the first embodiment, the force in which the slot 24 is formed in a two-stage shape including the first and second slot portions 24a and 24b. In the third embodiment, as shown in FIG. The teeth 26 are formed in a three-stage shape from the fan-shaped first, second, and third teeth portions 26a, 26b, and 26c, respectively, and the slots 27 are first, second, and third slot portions 27a, 27a, 27b and 27c are continuously provided in the radial direction, and the circumferential width is formed in a three-stage shape in which the circumferential width increases stepwise outward in the radial direction. The first, second, and third slot portions 27a, 27b, 27c collect two HOa, 41a, 42a forces in the slot yarn collection of the continuous conductor springs 40, 41, 42 as conductors having different cross-sectional areas. It is done in the thread.

Other configurations are the same as those in the first embodiment.

[0048] Also in this third embodiment, since the slot 27 is formed in a three-stage shape including the first, second and third slot portions 27a, 27b and 27c having a rectangular cross section, the two-stage shape is provided. Compared with the slot, the force S is used to bring the slot cross-sectional area closer to the fan-shaped slot cross-sectional area.

In addition, the first, second and third slot portions 27a, 27b, and 27c have slot collecting inner collars 40a, 41a, and 42a having two cross-sectional areas 40a, 41a, and 42a. Therefore, a 6-turn stator winding can be configured using three types of continuous conductor wires 40, 41 and 42, the number of parts can be reduced, and the production process can be simplified.

[0049] In the third embodiment, the force slot that forms the slot in a three-stage shape may be formed in a four-stage or more shape.

[0050] Further, in each of the above embodiments, the force s for producing the stator winding using the continuous conductor wire, and the stator using the U-shaped conductor segment instead of the continuous conductor wire Windings may be made. In this case, the conductor segment is inserted into each slot pair a predetermined number of slots away from one end of the cylindrical stator core, and the open ends of the conductor segments extending to the other end of the stator core are joined together. A stator winding comprising a plurality of windings wound so as to alternately take the inner layer and the outer layer in the slot depth direction within the slot portion of each stage for each predetermined number of slots. Produced. Even in the stator winding manufactured in this way, an even number of conductor segments are housed in the slot portions of each stage, and the number of conductor segments used is the same as the number of stages in the slot section, reducing the number of parts. it can. In addition, the joining workability is reduced because there are many joining points, but on the other hand, the step of attaching the winding assembly to a rectangular parallelepiped laminated core and bending the laminated iron core into a cylindrical shape becomes unnecessary.

In each of the above embodiments, the description has been made assuming that the present invention is applied to a stator of a vehicle alternator. However, the present invention is not limited to a vehicle alternator, and includes a vehicle motor, a vehicle generator motor, and the like. Even when applied to the stator of a rotating electric machine, the same effect is obtained.

Claims

The scope of the claims

[1] A cylindrical stator core in which slots are arranged at a predetermined pitch in the circumferential direction with openings facing the inner circumference, and a slot housing portion in which a plurality of conductors are part of the conductor are housed in the slot. And a stator winding comprising a plurality of windings wound around the stator iron core.

The slot has a shape having a plurality of steps in which a plurality of slot portions each having a rectangular cross section are connected in the radial direction, and the circumferential width of each of the slot portions is increased stepwise outward in the radial direction. Formed into

Each of the slot portions stores an even number of the slot storage portions arranged in a row in the radial direction,

The circumferential width of the slot housing portion corresponds to the circumferential width of the slot portion in which the slot housing portion is housed, and the radial length of the slot housing portion is that in which the slot housing portion is housed. A stator for a rotating electrical machine, characterized in that the length in the radial direction of the slot portion corresponds to a length obtained by dividing the length of the slot portion by the number of the slot accommodating portions accommodated in the slot portion.

[2] The slot is formed in a two-stage shape including a first slot portion on the inner peripheral side and a second slot portion on the outer peripheral side,

2. The rotating electrical machine according to claim 1, wherein a ratio k of a radial length of the first slot portion to a radial length of the slot satisfies 0.2 <k <0.8. stator.

[3] The stator winding includes a three-phase AC winding constituted by Δ Y mixed connection of the plurality of windings, and is housed in one slot portion of the first and second slot portions. Winding is Y-connected, and the winding housed in the other slot part of the first and second slot parts is Δ-connected,

The number of the slot accommodating portions accommodated in the one slot portion is equal to or less than the number of the slot accommodating portions accommodated in the other slot portion, and is accommodated in the one slot portion. The fixing of the rotating electrical machine according to claim 2, wherein the conductor cross-sectional area of the slot housing portion is housed in the other slot portion and is larger than the conductor cross-sectional area of the slot housing portion. Child.

[4] The slot cross-sectional area of the one slot portion is equal to the slot cross-sectional area of the other slot portion. The stator _c of the rotating electrical machine according to claim 3, wherein the stator _c is formed three times.