JP5239248B2 - Connection terminal, stator having the connection terminal, and stator manufacturing method - Google Patents

Description

  The present invention relates to a connection terminal connected to a coil of a split core of a rotating electrical machine, a stator having the connection terminal, and a stator manufacturing method.

  2. Description of the Related Art Conventionally, a rotating electric machine that constitutes a stator by arranging a plurality of divided cores in an annular shape is widely known. In such a stator of a rotating electrical machine, a lead wire drawn from a coil wound around each divided core is electrically connected to a bus bar and a printed board.

In the rotary electric stator described in Patent Document 1, the lead wire from the coil of the split core is sandwiched between the substantially U-shaped connection portions of the metal connection terminals, and the bus bar and the adjacent split core are connected via the connection terminals. Electrical connection with the lead wire.
JP 2003-333781 A

  By the way, in the stator of the rotating electrical machine described in Patent Document 1, the lead wire of the coil coated with the insulating resin and the connection terminal are connected by crimping the metal connection terminal using electrodes and crimping. (Hereinafter referred to as “the fusing method”). In other words, in the fusing method, an electric current is passed through a metal connection terminal, the insulating resin covering the lead wire of the coil is softened by the heat generated in the connection terminal when energized, and the connection terminal is pressed by applying pressure to the connection terminal. The coating of the coil lead wire is removed by extruding the insulating resin in contact with the connection portion, and the coil lead wire and the connection terminal are diffusion bonded.

  However, in the case of using an element wire having a flat rectangular cross section, the contact area between the coil lead wire and the connection portion of the connection terminal is increased, and the surface pressure when the connection terminal is pressurized is decreased. Therefore, it is difficult to remove the coating of the coil lead wire, and there is a problem that the coil lead wire and the connection terminal cannot be reliably connected.

  Therefore, in view of the above-described problems, the present invention has an object to provide a connection terminal capable of easily and surely connecting a lead wire of a split core, a stator having the connection terminal, and a stator manufacturing method. .

The present invention solves the above problems by the following means .

The present invention is a connection terminal that can be connected to a coil lead wire drawn from a split core of a rotating electrical machine , and is formed in an insertion portion for inserting the coil lead wire, the insertion portion, and the coil lead wire and the insertion portion. A contact portion that comes into contact with the coil lead wire when connecting, and a groove portion that is formed in the contact portion and that can collect the softened insulation coating of the coil lead wire that is pushed out by the contact portion at the time of connection. Among the contact portions, at least one contact portion is formed so as to protrude from the other contact portions.

  According to this invention, a groove part is formed in the contact part which contacts a coil leader line. Therefore, when connecting the coil lead wire and the connection terminal by the fusing method, the insulating resin of the softened coil lead wire is pushed out into the groove, so that the insulation resin can be removed quickly and the coil lead wire and the connection terminal are securely connected. It becomes possible to connect to.

  Moreover, since the contact area which contacts a coil lead wire reduces, the surface pressure at the time of a connection with a coil lead wire and a connection terminal can be raised. As a result, the insulating resin of the softened coil lead wire can be easily pushed out into the groove portion, and the coil lead wire and the connection terminal can be more reliably connected.

(First embodiment)
Hereinafter, a first embodiment will be described with reference to the drawings.

  FIG. 1 is a schematic diagram showing a configuration of a rotating electrical machine 100 having a stator 10.

  The rotating electrical machine 100 includes a stator 10 and a rotor 30 inside a cylindrical case 20.

  The rotor 30 includes a rotor core 31 and a rotating shaft 32. The rotor 30 is rotatably housed inside the case 20. The rotating shaft 32 of the rotor 30 is disposed so as to penetrate the central axis of the cylindrical rotor core 31.

  The stator 10 is a three-phase Y-type stator having input terminals U, V, W and a plurality of split cores 40. The plurality of divided cores 40 are arranged in an annular shape so as to surround the outer periphery of the rotor 30 inside the case 20. A coil 42 is wound around this divided core 40 around a laminated steel plate 41 in which electromagnetic steel plates are laminated.

  The coil 42 of the split core 40 is an enameled wire in which a strand is covered with an insulating resin. From the coil 42, a winding start lead wire 42a and a winding end lead wire 42b are drawn out to the outer diameter side (hereinafter referred to as "stator outer diameter side") when the split core 40 is arranged in an annular shape. The The winding start lead line 42a is connected to one of the input terminals U, V, and W by an annular input line bus bar or the like. Further, the winding end lead wire 42b is connected to the winding end lead wire 42b of the adjacent divided core 40 to form a neutral point of the Y-type connection.

  In the rotating electrical machine 100 configured as described above, the rotor 30 rotates with respect to the stator 10 to function as a motor, a generator, or the like.

  Next, the configuration of the split core 40 will be described with reference to FIG.

  FIG. 2A and FIG. 2B are diagrams showing the split core 40 constituting the stator 10. Here, FIG. 2B shows the split core 40 when viewed from the B direction in FIG.

  As shown in FIGS. 2A and 2B, the split core 40 includes a laminated steel plate 41 in which electromagnetic steel plates are laminated and caulked, a coil 42 wound around the laminated steel plate 41, a laminated steel plate 41, And an insulator 50 that insulates the coil.

  The insulator 50 is disposed so as to cover the side surface of the laminated steel sheet in the radial direction (hereinafter, “stator radial direction”) when the split cores 40 are disposed in an annular shape. This insulator 50 has an outer diameter side flange 51 protruding from the stator outer diameter side and an inner diameter side flange 52 protruding from the stator inner diameter side. An enameled wire is wound around the winding frame portion between the outer diameter side flange 51 and the inner diameter side flange 52 of the insulator 50 to form a coil 42.

  Further, as shown in FIG. 2B, the outer diameter side flange 51 of the insulator 50 is provided with a notch 53 so as to pass the winding start lead wire 42a drawn from the coil 42 and the winding end lead wire 42b. It is formed. Then, the winding start lead wire 42a drawn from the notch 53 to the stator outer diameter side is sandwiched by a substantially U-shaped connecting portion 61 formed on the metal connecting terminal 60, and the input terminals U, V, W Electrically connect to either The winding end lead wire 42b drawn from the notch 53 to the stator outer diameter side is sandwiched by a substantially U-shaped connecting portion 71 formed in the metal connecting terminal 70, and the winding end drawing of the adjacent split core 40 is performed. It is electrically connected to the line 42b.

  The winding end lead wire 42b is electrically connected to any of the input terminals U, V, and W, and the winding start lead wire 42a is electrically connected to the winding start lead wire 42a of the adjacent split core 40. May be.

  Here, a method of connecting the winding end lead wire 42b and the connection terminal 70 will be described with reference to FIG. In addition, since the connection between the winding start lead wire 42a and the connection terminal 60 has the same configuration, the description is omitted for the sake of convenience.

  FIG. 3 is an enlarged view of the vicinity of the connection portion 71 of the connection terminal 70. 3A is a perspective view, and FIG. 3B is a view when viewed from the B direction.

  As shown in FIGS. 3A and 3B, the metal connection terminal 70 has a substantially U-shaped connection portion 71.

  The connection portion 71 includes a base end portion 71a extending in the longitudinal direction of the connection terminal main body (a direction orthogonal to the direction through which the winding end coil lead wire 42b is inserted), and a bent portion wound from the base end portion 71a. The folded portion 71b is folded back so as to surround the end coil lead wire 42b, and the distal end portion 71c extends in parallel with the proximal end portion 71a from the folded portion 71b. In the connecting portion 71, a groove portion 74 and a flat portion 75 are formed on surfaces 72 and 73 of the distal end portion 71c and the proximal end portion 71a that face each other.

  The groove portion 74 is formed in the width direction of the connecting portion 71 (the direction in which the winding end lead wire 42b is inserted). The plurality of groove portions 74 are arranged in the longitudinal direction of the connection portion 71 in parallel with each other. A flat portion 75 having a flat surface in the same plane as the surfaces 72 and 73 is formed between the groove portions. 3A and 3B, the groove portion 74 and the flat portion 75 formed on the surface 72 and the groove portion 74 and the flat portion 75 formed on the surface 73 are formed at positions corresponding to each other. However, it does not necessarily have to be formed at a corresponding position.

  Then, the winding end lead wire 42b drawn from the coil 40 is inserted in the connecting portion 71 of the connecting terminal 70 configured in this way in the width direction of the connecting portion 71 as shown by the broken line in FIG. To do.

  The connection portion 71 of the connection terminal 70 and the winding end lead wire 42b are electrically connected as follows.

  FIG. 4 is a diagram showing a connection method when connecting the connection portion 71 of the connection terminal 70 and the winding end lead wire 42b by the fusing method.

  First, as shown in FIG. 4A, the winding end lead wire 42b in which the conductor 422 is covered with the insulating resin 421 is inserted into the substantially U-shaped connection portion 71 of the connection terminal 70 (insertion step).

  And the front end 76 of the front-end | tip part 71c of the connection part 71 is pushed down inside (lower side in the figure), and the connection part 71 winds in the end-of-winding lead line 42b, thereby the end-of-winding lead line 42b and the connection part 71 Is temporarily fixed (temporary fixing step).

  Thereafter, as shown in FIG. 4B, the crimped and energized caulking electrode 200 is brought into contact with the surface opposite to the surfaces 72 and 73 of the connecting portion 71. The crimping energization caulking electrode 200 pressurizes the connection part 71 and the winding end lead wire 42b so as to be crimped (inner side in the figure), and energizes the connection part 71. When the connection portion 71 is energized, current first flows through the metal connection portion 71 as shown by the arrow in FIG. 4B, and the temperature of the connection portion 71 rises. Then, the insulating resin covering the end-of-winding lead wire 42b is heated and softened by the heat generated in the connection portion 71 (crimping energization caulking step).

  Here, since the connection portion 71 of the connection terminal 70 is pressed inward in the figure by the crimped and energized caulking electrode 200, when the insulating resin 421 of the winding end lead wire 42b is softened, as shown in FIG. The insulating resin 421 between the surfaces 72 and 72 of the connecting portion 71 and the conductor 422 of the winding end lead wire 42 b is pushed out into the groove portion 74. Then, since the conductor 422 of the winding end lead wire 42b and the flat portion 75 of the connecting portion 71 are in contact with each other, the current is applied not only to the connecting portion 71 but also to the conductor 422 as shown by the arrow in FIG. It begins to flow. Thereby, the connection part 71 of the connection terminal 70 and the conductor 422 of the winding end lead wire 42b are heated and electrically connected by diffusion bonding (connection process).

  As described above, the following effects can be obtained in the first embodiment.

  A plurality of groove portions 74 are formed in parallel in the width direction of the connection portion 71 on the surfaces 72 and 73 of the connection portion 71 of the connection terminal 70. Therefore, even if the winding end lead wire 42b and the connecting portion 71 are connected by the fusing method, the insulating resin of the softened winding end leading wire 42b flows into the groove portion 74 of the connecting portion 71, so that the insulating resin can be removed quickly. Thus, the end-of-winding lead wire 42b and the connecting portion 71 can be reliably connected.

  Further, on the surfaces 72 and 73 of the connection portion 71 of the connection terminal 70, a flat portion 75 is formed between the groove portions. Since the flat portion 75 and the winding end lead wire 42b are in contact with each other, even when an enameled wire having a rectangular cross section is used for the coil 42 of the split core 40, the contact between the winding end lead wire 42b and the connecting portion 71 is achieved. Since the area decreases, the contact pressure at the time of connection increases. Therefore, the softened insulating resin 421 of the winding end lead wire 42b is easily pushed out into the groove 74, and the winding end lead wire 42b and the connection portion 71 can be more reliably connected.

(Second Embodiment)
FIG. 5 is a diagram illustrating the connection portion 71 of the connection terminal 70 in the second embodiment.

  The configuration of the split core 40 is substantially the same as that of the first embodiment, but is partially different in the configuration of the connection portion 71 of the connection terminal 70 to which the winding end lead wire 42b drawn from the coil 42 of the split core 40 is connected. That is, a part of the flat portion 275 formed in the width direction of the connecting portion 71 is formed so as to protrude from the surfaces 72 and 73, and the difference will be mainly described below. In addition, since the structure of the connection terminal 60 connected with the winding start lead line 42a withdraw | derived from the split core 40 is also the same, description is abbreviate | omitted for convenience.

  FIG. 5A shows a perspective view of the connection portion 71 of the connection terminal 70. FIG. 5B shows the connecting portion 71 when viewed from the B direction.

  As shown in FIGS. 5A and 5B, a groove portion 274 and a flat portion 275 are formed on the surfaces 72 and 73 of the connection portion 71 of the connection terminal 70.

  The groove 274 is formed in the longitudinal direction of the connecting portion 71 (the direction in which the winding end lead wire 42b is inserted). The plurality of groove portions 274 are arranged in parallel to each other in the longitudinal direction of the connection portion 71. A flat portion 275 having a flat surface is formed between the groove portions. As shown in FIG. 5B, the flat portion 275 includes a low flat portion 275a having a plane in the same plane as the surfaces 72 and 73, and a high flat portion 275b formed so as to protrude from the surfaces 72 and 73. It is composed of The low flat portions 275a and the high flat portions 25b are alternately arranged in the longitudinal direction of the connecting portion 71. 5A and 5B, the groove portion 274, the low flat portion 275a, and the high flat portion 275b formed on the surface 72, and the groove portion 274, the low flat portion 275a formed on the surface 73, and the high The flat portions 275b are formed at positions corresponding to each other, but need not be formed at corresponding positions.

  In the connection portion 71 of the connection terminal 70 configured as described above, a winding end lead wire 42b drawn from the coil 40 is inserted in the width direction of the connection portion 71, and the connection portion 71 and the winding end lead wire are formed by a fusing method. 42b is electrically connected.

  As described above, the following effects can be obtained in the second embodiment.

  The surfaces 72 and 73 of the connection portion 71 of the connection terminal 70 are formed between the groove portions so as to protrude from the surfaces 72 and 73 and a low flat portion 275a having a plane in the same plane as the surfaces 72 and 73. And a high flat portion 275b. In the second embodiment, since the high flat portion 275b that protrudes from the surfaces 72 and 73 and the winding end lead wire 42b first contact each other, the surface pressure at the time of connection can be made higher than that in the first embodiment. . Therefore, the high flat portion 275b of the connecting portion 71 and the winding end lead wire 42b can be connected at an early stage. When the high flat portion 275b is crushed after the high flat portion 275b and the winding end lead wire 42b are connected, the low flat portion 275a and the winding end lead wire 42b come into contact with each other. 71 and the end-of-winding lead wire 42b can be reliably connected.

  Further, since the insulating resin of the softened winding end lead wire 42b is discharged into the groove portion 274, the same effect as that of the first embodiment can be obtained.

(Third embodiment)
FIG. 6 is a diagram illustrating the connection portion 71 of the connection terminal 70 according to the third embodiment.

  The configuration of the split core 40 is substantially the same as that of the first embodiment, but is partially different in the configuration of the connection portion 71 of the connection terminal 70 to which the winding end lead wire 42b drawn from the coil 42 of the split core 40 is connected. That is, the groove portion 374 is provided in the longitudinal direction of the connection portion 71, and the difference will be mainly described below. In addition, since the structure of the connection terminal 60 connected with the winding start lead line 42a withdraw | derived from the split core 40 is also the same, description is abbreviate | omitted for convenience.

  FIG. 6A shows a perspective view of the connection portion 71 of the connection terminal 70. FIG. 3B shows a cross section of the connecting portion 71 on the surface indicated by the broken line B.

  As shown in FIGS. 6A and 6B, the connection portion 71 of the metal connection terminal 70 is formed with grooves 374 and a flat portion 375 on the surfaces 72 and 73.

  The groove portion 374 is formed in the longitudinal direction of the connection portion 71 (a direction orthogonal to the direction in which the winding end lead wire 42b is inserted). A plurality of groove portions 374 are arranged in the width direction of the connection portion 71 in parallel with each other. A flat portion 375 having a flat surface in the same plane as the surfaces 72 and 73 is formed between the groove portions. 6A and 6B, the groove portion 374 and the flat portion 375 formed on the surface 72 and the groove portion 374 and the flat portion 375 formed on the surface 73 are formed at positions corresponding to each other. However, it does not necessarily have to be formed at a corresponding position.

  In the connection portion 71 of the connection terminal 70 configured as described above, a winding end lead wire 42b drawn from the coil 40 is inserted in the width direction of the connection portion 71, and the connection portion 71 and the winding end lead wire are formed by a fusing method. 42b is electrically connected.

  As described above, in the third embodiment, the following effects can be obtained.

  A plurality of groove portions 374 are formed in the longitudinal direction of the connection portion 71 on the surfaces 72 and 73 of the connection portion 71 of the connection terminal 70, and a flat portion 75 is formed between the groove portions. Therefore, even if the winding end lead wire 42b and the connecting portion 71 are connected by a fusing method, the softened insulating resin of the winding end leading wire 42b can be discharged into the groove portion 374 of the connecting portion 71, and the winding end leading wire 42b is connected. Since the contact area with the part 71 can be increased and the contact pressure at the time of connection can be increased, the same effect as in the first embodiment can be obtained.

  It is obvious that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical idea.

  For example, in the first to third embodiments, the groove portions 74, 274, and 374 are formed as linear shapes, but are not limited to such shapes. That is, the grooves 74, 274, and 374 may be formed as grooves that allow the softened insulating resin to flow. For example, the grooves 74, 274, and 374 may be curved.

It is the schematic which shows the structure of the rotary electric machine which has a stator. It is a figure which shows the division | segmentation core which comprises a stator. It is the figure which expanded the vicinity of the connection part of a connection terminal. It is a figure which shows the connection method when connecting the connection part of a connection terminal, and the winding end leader line by a fusing method. It is a figure which shows the connection part of the connection terminal in 2nd Embodiment. It is a figure which shows the connection part of the connection terminal in 3rd Embodiment.

Explanation of symbols

100 Rotating electric machine 200 Crimping current crimping electrode (electrode)
10 Stator 30 Rotor 40 Divided Core 41 Laminated Steel Plate 42 Coil 42a Winding Lead Line (Coil Lead Line)
42b End of lead wire (coil lead wire)
421 Insulating resin 422 Conductor 50 Insulator 60, 70 Connection terminal 71 Connection part (insertion part)
71a Base end part 71b Folding part 71c Tip part 72, 73 Surface 74, 274, 374 Groove part 75, 275, 375 Flat part (contact part)
275a Low flat part (other contact part)
275b High flat part (one contact part)

Claims (10)

A connection terminal connectable to a coil lead wire drawn from a split core of a rotating electric machine,
An insertion portion for inserting the coil lead wire;
A contact portion that is formed in the insertion portion and contacts the coil lead wire when the coil lead wire and the insertion portion are connected;
Wherein a plurality of formed to the contact portion, provided with a groove and capable of collecting the softened insulating coating of the coil lead lines extruded by the contact portion at the time of connection,
The connection terminal is characterized in that at least one contact portion of the contact portions between the groove portions protrudes from the other contact portions . The insertion portion is folded so that a base end portion in which the coil lead wire is extended from the connection terminal body in a direction orthogonal to the direction of insertion, is bent from the base end portion surrounding said coil lead line includes a folded portion, and a distal portion that extends parallel to the base end portion from said folded portion being,
The contact portion, a connection terminal according to claim 1, characterized in that provided to connect to the coil lead wire and before Kimoto end to said distal end. The groove is formed in the same direction as the direction in which the coil lead wire is inserted.
The connection terminal according to claim 1, wherein: The groove is formed in a direction orthogonal to a direction in which the coil lead wire is inserted.
The connection terminal according to claim 1, wherein: The connection terminal according to claim 3, wherein the groove portions are provided so as to be parallel to each other. 6. The connection terminal according to claim 1, wherein the one contact portion and the other contact portion are alternately arranged. The coil lead wire has a flat cross section.
The connection terminal according to any one of claims 1 to 6 , wherein The stator which connected the connecting terminal as described in any one of Claim 1 to 7, and the coil lead wire withdraw | derived from the split core of the rotary electric machine. A stator manufacturing method for connecting a coil lead wire drawn from a split core of a rotating electrical machine and the connection terminal according to any one of claims 1 to 7 ,
An insertion step of inserting the coil lead wire into the insertion portion of the connection terminal;
Crimping and energizing caulking process in which the insertion part is crimped and energized by an electrode,
The contact portion formed in the insertion portion and the coil lead wire are brought into contact with each other, and further, the insulation coating softened by the coil lead wire is pushed out into the groove portion by heat during energization, and the conductor of the coil lead wire and the contact portion are A connection process for electrical connection;
A stator manufacturing method comprising: A temporary fixing step of temporarily fixing the coil lead wire and the insertion portion after the insertion step;
The stator manufacturing method according to claim 9 .

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