JP2001238390A - Connecting metal fitting for coil of rotating machine, and coil unit coupled hereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce stresses at mounting on teeth, by facilitating coupling between coils. SOLUTION: A pair of ends of a conductor are drawn out of the end face of a molded-coil 3. The ends of the conductors drawn out of the molded coil 3, which adjoin each other when mounted on a teeth are connected with each other by means of conductive connecting metal fitting 20. For the connecting metal fitting 20, joint 21 connectable with the end of the conductors are arranged at both ends, and spring 22 having spring property is arranged in the middle. When mounting a coil unit 12 mode of coupled molded coils 3 to the teeth, the twisting force or the like acts on the connecting metal fitting 20, but the stress is reduced by the spring 22, and this results in no excessive force acting between the connection and the conductor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal fitting for a coil of a rotating machine.

[0002]

2. Description of the Related Art A rotating machine such as an electric motor or a generator is
A stator (stator) and a rotor (rotor) are provided, and the stator further includes a core and a coil mounted inside the core. The core further comprises a cylindrical core back, and a teeth member concentrically incorporated therein and having a large number of teeth radially extending on the outer peripheral surface.
A coil formed by winding a conductive wire a predetermined number of times is wound around each tooth. Each coil is usually a unit (coil unit) in which an appropriate number of the coils are connected as one unit, and the unit is attached to a tooth or connected to an external power supply. Conventionally, the following two methods have been known as methods for connecting the coils in a coil unit. One is to form an appropriate number of coils in series by continuous winding. The other is a method in which the ends of the coils are further bent outward at right angles, and the bent ends are sequentially connected by welding.

[0003]

However, in the former method, the winding direction of the coil is opposite between adjacent ones, so that it is not technically easy to continuously wind the coil. Also, with the latter method, it is extremely difficult to form such that the welding portions of the coils to be connected can be correctly aligned with each other. Therefore, in such a case, when mounting the coil unit to the teeth, there is a problem that an excessive force is applied to the welded portion. In particular, these problems become apparent when a highly rigid wire having a large winding diameter is used.

The present invention has been devised in view of the above-described conventional problems, and has as its object to provide a rotating machine capable of easily connecting coils and relieving stress at the time of attachment to teeth. It is an object of the present invention to provide a coil connection fitting.

[0005]

According to a first aspect of the present invention, there is provided a stator of a rotating machine, wherein a plurality of coils each having a plurality of windings of a conductive wire are arranged along a circumferential direction. A conductive connection fitting for connecting end portions respectively drawn from adjacent ones of the coils, wherein the both end portions have joints respectively fixed to ends of the adjacent coils. And a spring portion having spring properties is arranged between the joint portions. According to a second aspect of the present invention, in the first aspect, the joint portion and the spring portion are integrally formed, and the spring portion is formed to be thinner than the joint portion. Things. Further, according to the invention of claim 3, both ends of the coil are extended in the same direction, and the coil is formed by insert molding with an insulating material to project the end of the coil. A coil unit that becomes a predetermined number of connected bodies when being incorporated in a stator of a rotating machine along a circumferential direction, and a spring portion having spring properties is disposed at an intermediate portion between ends of adjacent coil formed bodies. The above-mentioned number is sequentially connected by conductive connection fittings having joint portions fixed to the ends at both ends.

[0006]

According to the first aspect of the present invention, the coils are connected by connecting the corresponding ends of the two coils by connecting metal fittings. In that case, the joints at both ends of the connection fitting are fixed to the ends of the coils, and connection between the coils is made. After that, or before that, the teeth are attached to the teeth, but even if the ends of the adjacent coils are not in the proper positional relationship, since the spring portion has spring properties, Thus, the above-described positional shift can be absorbed to achieve stress relaxation at the time of mounting. According to the second aspect of the present invention, since the spring portion is formed by thinning the central portion, and the connecting fitting can be integrated with the spring portion, the handleability is excellent. According to the third aspect of the present invention, since each coil is formed as a coil formed body having a predetermined shape by the insulating material, the shape stability is superior to that of the coil alone. In addition, these molded bodies are sequentially connected to each other by a predetermined number of connection fittings to form a coil unit, but since the spring portion of the connection fitting is provided with a spring property at the connection portion, when the coil units are collectively mounted at a time. Good mounting is also possible.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. However, in this embodiment,
An example in which the present invention is applied to an assist motor (step motor) for assisting steering of an automobile will be described. However, the present invention can be applied to various motors, and is not limited to motors, but can also be applied to various rotating machines including generators.

The assist motor according to the present embodiment is
The stator 1 includes a stator 1 and a rotor (not shown) incorporated in the center of the stator 1. The stator 1 shown in FIG. 1 includes a core 2 and a coil formed body 3, and the core 2 includes a core back 4 and a tooth member 5. The core back 4 is formed in a substantially cylindrical shape, and a large number of slits 7 are formed on the inner peripheral surface thereof at equal angles and over the entire length. The teeth member 5 has an annular shape that can be accommodated concentrically in the core back 4, and the same number of teeth 8 protrude radially over the entire outer surface of the core member 4 corresponding to the slits 7. A narrow positioning portion 8A that fits and fits into each slit 7 is formed on the tip end surface of each tooth 8 so as to protrude over the entire length. Then, when the teeth members 5 are accommodated in the core back 4 in a state where the respective teeth 8 are fitted into the slits 7, respectively, the space between the adjacent teeth 8 and the core back 4
The space that forms a fan shape surrounded by the inner wall of
become.

As will be described later, the coil molded body 3 is fitted to the corresponding teeth 8 in units of three coil units 12 and connected to the teeth member 5. Then, in this state, the teeth member 5 is incorporated into the core back 4. Thus, half of each coil molding 3 is accommodated in each of the slots 9 located on both sides of the tooth 8.

In this embodiment, the coil molded body 3 is a coil 6 (FIG. 4 or 5) formed by winding a conductor in five steps.
Both of the inner peripheral side and the outer peripheral side are embedded in an insulating portion 10 formed into a predetermined shape by insert molding. The insulating part 10 is made of a synthetic resin,
In this embodiment, PP having excellent fluidity and excellent heat resistance is used.
S (polyphenylene sulfide) was used. The coil molded body 3 is formed such that a flat cross section that expands to the outer peripheral side corresponding to the space shape of the slot 9 forms a fan shape, and the window hole 11 extends from the inner peripheral side surface to the outer peripheral side surface. It is formed to penetrate and can be fitted to the teeth 8. Further, the coil molded body 3 is formed on the outer surface of the insulating portion 10 and the window hole 11.
Along the width direction, that is, the teeth 8
The plurality of concave and convex portions 24a, 24
b, 27a and 27b are formed. The irregularities 24a and 24b provided on the outer surface of the insulating part 10 are out of phase with each other on the left and right side surfaces.
When mounted on the coil, the adjacent coil molded bodies 3 mesh with each other. By doing so, the mounting of the coil molded body 3 is guided, and the displacement of the coil molded body 3 can be restricted by mutual engagement. In addition, the uneven portions 27a and 27b provided in the window hole 11 can reduce the contact area with the teeth 8, and can ensure smooth mounting by reducing the fitting resistance.

On the other hand, the coil 6
Are drawn out in parallel. When the coil molded body 3 is mounted in the core 2, the ends of the pulled-out members are connected to each other by a connection fitting 20 described later.

As shown in FIG. 5, the degree of crushing of the coil 6 in the coil molded body 3 is set for each winding step, and the degree of crushing of the coil 6 in a planar manner as it approaches the outer peripheral side of the core 2 is approximately determined. Has been strengthened. In this embodiment, the first stage located on the innermost side is made of the material of the conductive wire L and is not crushed as it is, but the second stage to the fourth stage are gradually reduced in thickness, and conversely, are widened. It is made to be crushed gradually and strongly. The fourth and fifth stages have the same crush ratio. The conducting wire L is composed of a metal wire such as copper and an insulating coating for insulating the surface of the metal wire.

The coil 6 is formed by processing a conductor L (made of copper) having a diameter of 2.2 mΦ.
The thickness of the first stage remains 2.2 mm, the thickness of the second stage is 1.6 mm, the thickness of the third stage is 1.4 mm, and the thickness of the fourth and fifth stages is 1.3 mm. Of course, the degree of such crushing should be variously changed in accordance with the required performance and the shape of the slot 9, and the one shown here is only an example.

Both ends of the coil 6 are drawn out in the same direction, and at each stage where the conducting wire L is wound, edges on the side from which both ends 6a and 6b of the coil 6 are drawn out are respectively connected to the ends. It is formed in the shape of a letter. That is, at each stage of the coil 6, the winding start portion (S in FIG. 4)
2 is wound in the same plane from the winding start portion of the second stage to the winding end portion (also F2 is the winding end portion of the second stage). ,
At the transition to the next stage, the upward slope K1
K4 is formed, and is lifted by at least a height equal to or greater than the thickness of the element wire L of the corresponding step. Thereby, unlike the conventional case, the total height (h) of the coil 6 does not increase more than the number of winding steps, and the upper and lower surfaces are respectively flat surfaces as a whole, so that the posture can be stabilized. .

In this embodiment, the coil molded body 3 is incorporated into the core 2 as a set of three (the set is the coil unit 12). Among the coil molded bodies 3 constituting the coil unit 12, those located on the left and right sides have lengths set to the lengths of the drawn coil ends 6a and 6b. Both are set to the shorter length dimension. Further, in each coil molded body 3 in the coil unit 12, the winding direction of each coil 6 is all the same. Therefore, in the coil unit 12, the direction of the current is different between the left and right coil molded bodies 3 and the coil molded body 3 located at the center, and a pole is formed for each coil molded body.

The connection fitting 20 is made of copper in this embodiment, and is made of a flat band material. Joint portions 21 for fixing the corresponding ends of the coil molded body 3 to each other are arranged at both ends thereof, and an intermediate portion between them is a spring portion 22. Since the material of the connection fitting 20 is made of soft copper, the spring portion 22 exhibits good flexibility (spring properties). Both joint portions 21 are formed by folding an end of the joint portion 21 into a substantially U-shape. The coil 6 embedded in the coil molded body 3 is pulled out from two corner portions at diagonal positions on the lower end surface of the coil molded body 3, respectively.
The connection fitting 20 is attached before the coil unit 12 is attached to the teeth 8 of the teeth member 5 (may be performed later). As shown in FIG. 8, the coil molded body 3 located at the center and the coil molded bodies 3 located at the left and right are positioned on the inner peripheral side when mounted on the teeth member 5 or positioned on the outer peripheral side. Are connected by caulking. In this case, if necessary, the swaged portion may be further welded. The ends 6a and 6b of the coil 6 of the coil unit 12 that are not connected by the connection fitting 20 are connected to a power source (not shown) outside the rotating machine via a lead wire.

Next, the operation and effect of this embodiment configured as described above will be specifically described. First, in order to configure the coil unit 12, the coil 6 of each coil molding 3 is formed.
The end portions 6a and 6b having a short length and the short end portions 6a are connected by a connection fitting 20 in the manner shown in FIG. At this time, the connection fittings 20 are caulked to both joint portions 21 and fixed to the ends 6a and 6b of the corresponding coil 6. After the coil unit 12 is assembled in this way, the window holes 11 of each coil molded body 3 are fitted into each tooth 8 of the tooth member 5 next. At this time, since each tooth 8 protrudes in the radial direction, when the coil unit 12 is mounted, each coil molded body 3 is brought into the state shown in FIG. 8 from the state shown in FIG. Is moved in the direction of For this reason, both joint portions 21 of each connection fitting 20
A force associated with the movement of the coil molded body 3 acts on the teeth member 5 by elastically deforming the spring portion 22 such that the spring portion 22 expands to the outer peripheral side. The joint part 21 absorbs the accompanying force.
The effect on the environment can be minimized.
Therefore, the joint 21 and the coil ends 6a, 6b
Is maintained, and conduction reliability is improved.

As described above, according to the above-described embodiment, since the connection fitting 20 is provided with spring properties, it is assumed that a force acts on the joint portion 21 during handling or assembling to the teeth member 5. Also, since the spring portion 22 is deformed, it can be reliably absorbed, and a good connection state between the joint portion 21 and the ends 6a, 6b of the coil 6 can be maintained. In the present embodiment, since the coil 6 is the coil molded body 3 formed into a predetermined shape, the coil 6 is superior in form stability as compared with a single coil. Therefore, compared with the case where each coil 6 is individually mounted on each tooth member 5 with an appropriate insulator interposed therebetween, the operation of mounting each coil unit 12 can be performed smoothly. Further, if the coil molded body 3 is used, the positions where the ends 6a and 6b of the coil 6 are pulled out can be relatively stably reduced to reduce the variation. it can.

FIG. 11 shows another embodiment of the connection fitting 20a. In this embodiment, the spring portion 22a is formed thinner than the joint portions 21a (T1> T2). That is, the spring portion 22a is pressed to have a reduced plate thickness, so that a higher spring property can be imparted as compared with a member formed with the same plate thickness. Further, in the one shown in the figure, the direction of turning back at the joint portion 21a is opposite to the inside and outside directions.

In the present invention, various modifications are possible.
The following modifications are also included in the technical scope of the present invention. In any of the embodiments, the coil is shown as being buried in the coil molded body 3. However, in the present invention, the coil may be used alone and connected by the connection fitting 20. . The joint portion 21 is connected to the end of the coil by caulking, but may be a method of performing only welding, a method of performing only soldering, or a method of performing connection in cooperation with caulking. Although the joint portion is shown as folded in a U-shape in order to caulk the end of the coil, a method in which a hole is provided and press-fitted therein may be used. Although the coil winding directions of the respective coil molded bodies constituting the coil unit are all set to the same direction, the winding directions may be reversed in order. In this case, in each coil molded body of the coil unit, the current direction of each coil can be made the same, and one pole can be constituted by the entire coil unit.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a stator.

FIG. 2 is a plan sectional view of a core.

FIG. 3 is an enlarged perspective view showing a coil molded body.

FIG. 4 is a front view of the coil as viewed from the end of the drawer.

FIG. 5 is a cross-sectional plan view of a coil molded body.

FIG. 6 is a front sectional view showing a state when the coil molded body is mounted on a tooth member.

FIG. 7 is a perspective view of a connection fitting.

FIG. 8 is an end view showing a coil unit.

FIG. 9 is a front view of the same.

FIG. 10 is an end view showing a state of being attached to the teeth member.

FIG. 11 is a perspective view showing another embodiment of the connection fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Stator 3 ... Coil molding 6 ... Coil 12 ... Coil unit 20, 20a ... Connection metal fittings 21, 21a ... Joint part 22, 22a ... Spring part

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 5H002 AA07 AB06 AC01 AC08 AE07 5H603 AA03 AA09 BB01 BB02 CA01 CA05 CB02 CB03 CB11 CB23 CB24 CB26 CC03 CD01 CD04 CD21 CE01 CE09 EE01 EE04 EE13 FA02 5H604 AA08 DB01 CC03 PB03 QB14

Claims (3)

[Claims] 1. A plurality of coils each having a plurality of windings of a conductive wire arranged in a circumferential direction in a stator of a rotating machine, and end portions respectively drawn from adjacent ones of the coils. A conductive connection fitting for connecting the coil, at both ends, a joint portion is formed to be fixed to an end portion of the adjacent coil, and a spring portion having spring property is provided between the joint portions. A connection fitting for a coil of a rotating machine, which is provided. 2. The connection for a coil of a rotating machine according to claim 1, wherein the joint part and the spring part are formed integrally, and the spring part is formed thinner than the joint part. Metal fittings. 3. Both ends of the coil extend in the same direction, and are formed into a coil formed by insert-molding an insulating material to project the end of the coil. A coil unit that becomes a predetermined number of connected bodies when incorporated in a stator along the circumferential direction, wherein ends of adjacent coil molded bodies are provided with spring portions having spring properties in an intermediate portion, and both ends. A coil unit which is sequentially connected by the above number by a conductive connection fitting provided with a joint portion fixed to the end portion.