JP2008278703A - Stator for rotary electric machine, bus bar unit used for the same, and connection structure between terminal for bus bar and coil terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the influence on bus bars by a connection caulking force between lead terminals 19A, 19B of bus bars 16U, 16V, 16W, 16N and coil terminals 8A, 8B and to shorten the length of a shaft direction of a stator A. <P>SOLUTION: Coil terminals of each of phases are led out so as to follow the circumference c concentric with a stator core 1, the led terminals from each of bus bars are led out in the diameter direction of the stator and bent 21 so as to follow the same circumference, and a coil terminal is inserted into a U-shaped connection piece 22 of its end and caulked. Since the caulking force is eased not a little due to warpage-deformation of a bent portion 21 and transmitted to the bus bars through a leading portion 20, no connection failure between a terminal and the bus bar is caused. Since the bent portion 21 is shifted in a lateral direction from the leading portion 20, a connection piece is provided on an any position in a vertical direction of the bent portion and is prevented from being positioned above the leading portion 20. This prevention can suppress the length of the axial direction of the stator can also be suppressed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stator for a rotating electric machine incorporated in a hybrid vehicle or a fuel cell vehicle, a bus bar unit of the stator, and a connection structure between a coil terminal of the stator and a terminal of the bus bar.

Hybrid vehicles and fuel cell vehicles use rotating electrical machines as drive units and regenerative brakes. An example of the stator constituting the rotating electrical machine will be described with reference to FIGS. 1 to 4 showing an embodiment of the present invention. A ring-shaped yoke 9 and teeth extending radially inward from the yoke 9 are described. 5, a coil 8 wound around each tooth 5 of the stator core 1 via an insulator 7, and a ring-shaped bus bar unit 3 arranged on the same axis on the stator core 1. (See Patent Document 1).
JP 2006-67740 A

In this stator A for rotating electrical machines, each of the winding start terminals 8A and each winding end terminal 8B is routed along the same circumference c concentric with the stator core 1, and the winding start terminal 8A of each coil 8 or A power supply terminal 19B drawn from the power supply bus bars 16W, 16V, 16U of the bus bar unit 3 is connected to the winding end terminal 8B, and the neutral point bus bar of the bus bar unit 3 is connected to the winding end terminal 8B or the winding start terminal 8A of each coil 8. A neutral point terminal 19A drawn from 16N is connected.
As described above, the connection jigs are moved on the same circumference c by making the connections between the power supply terminals 19B and the neutral point terminals 19A and the coil terminals 8B and 8A on the same circumference c. Therefore, the connection workability is excellent.

The bus bar unit 3 is generally a unit in which the bus bars 16W, 16V, 16U, and 16N are stacked and integrated via an insulating layer (Patent Document 2: Code 16, Patent Document 3: Code 20), and a stator core. 1 (see FIG. 2 of Patent Document 2 and FIG. 4 of Patent Document 3).
Japanese Patent Laid-Open No. 06-234383 JP 2004-56873 A

  In the conventional stator A for rotating electrical machines, connection between the power supply terminal 19B and the neutral point terminal 19A and the terminals 8B and 8A of the coils 8 is performed by feeding and neutralizing the plate bars from the bus bars 16W, 16V, 16U and 16N. The point terminals 19B and 19A are pulled out, the leading ends of the terminals 19A and 19B are bent downward in a U-shape, and the terminals 8B and 8A of the coil 8 are placed in the U-shaped connection piece 22 to connect the connection pieces 22 (See Patent Document 1 FIGS. 2 and 3).

However, the U-shaped connection piece is formed on the same axis as the terminal drawing direction in plan view (see FIG. 2 of Patent Document 1), and when the connection piece is caulked to the coil terminal, the connection piece is coiled. Since it is performed close to the terminal, the caulking force is applied to the bus bar via the terminal, which may cause a connection failure between the terminal and the bus bar.
Further, when the U-shaped connecting piece is formed on the same axis as the drawing direction of the terminal in plan view, the U-shaped connecting piece has to be on the upper side from the drawing axis (see Patent Document 1 FIG. 3), When the connecting piece is on the upper side, the axial direction of the stator becomes longer, which is an obstacle when it is required to reduce the length.
The influence of the caulking force on the bus bar and the problem that the connecting piece is on the same axis as the direction in which the terminal is pulled out are the same in other connection modes between the connecting piece and the coil terminal by TIG welding or the like (see FIG. 12). .

Furthermore, the bus bar units of Patent Documents 1 and 3 have a power supply bus bar and a neutral point bus bar when a coil terminal drawn from the coil winding portion to the yoke side is connected to the power supply terminal and the neutral point terminal. Is arranged so as to overlap the yoke as viewed from the axial direction of the stator. For this reason, in order to secure a sufficient cross-sectional area of the magnetic path formed by the yoke, when the yoke is thicker in the stator axial direction than the teeth (see FIG. 3), the bus bar is further placed on the thickened yoke. Since the unit is placed, the axial direction of the stator A becomes longer.

  The first object of the present invention is to reduce the influence of the connection force on the bus bar when the terminal pulled out from the bus bar and the coil terminal are connected, and the axial length of the stator due to the structure of the connection portion and the like. It is a second problem to shorten it.

In order to solve the above first problem, the present invention provides a bus bar terminal that is drawn out in the radial direction of the stator core, further bent along the circumferential direction of the stator core, and a coil terminal at the bent portion. It is assumed that it has a connecting piece that faces, and a coil terminal is connected to the connecting piece of the bus bar terminal.
In this way, the force at the time of connection of the terminal and the terminal by caulking or the like is applied to the bus bar from the bent portion along the circumferential direction of the terminal via the lead portion, and the bent portion is pulled out. Since it is bent (laterally) with respect to the portion, when the connecting force is applied, the portion bent with respect to the drawer portion is bent. For this reason, due to the bending or the like, the connection force is not less relaxed and is transmitted to the bus bar via the lead-out portion, so that the connection force is less likely to be applied to the bus bar than in the past, and a connection failure between the terminal and the bus bar may occur. Will be less.

  In addition, the bent portion of the lead terminal from each bus bar that is bent along the circumferential direction described above is displaced laterally from the lead-out direction of the terminal, and the connection piece provided at the tip of the bent terminal is bent laterally. Since it can be easily provided at an arbitrary position in the vertical direction with respect to the part (see FIGS. 8 to 11 of the present application), it is possible to suppress the upper side as much as possible with respect to the lead axis of the terminal. For this reason, it is possible to eliminate as much as possible the axial direction of the stator as long as the conventional connecting piece is on the upper side with respect to the lead-out axis of the terminal. That is, the second problem is achieved.

As another means for achieving the second problem, it is possible to employ a configuration in which the bus bars are arranged in parallel along the side surface of the stator core.
In general, the radial direction of the ring-shaped stator core becomes longer as the rotating electrical machine (stator) becomes larger, and the side surface of the stator core also becomes wider accordingly. The expansion of the stator in the axial direction by the bus bar is only the thickness of the bus bar. This is advantageous for downsizing the stator.
At this time, if the bus bars arranged in parallel are provided in the teeth portion of the stator core, the bus bars are installed in the thick space on the teeth even if the yoke is thick. Is even more advantageous.

  As a specific configuration for achieving each of the above problems, in the connection structure between the terminal of each coil of the ring-shaped stator core of the rotating electrical machine and the bus bar terminal drawn from the ring-shaped bus bar provided on the same axis of the stator core, the bus bar The terminal is pulled out in the radial direction of the stator core, further bent along the circumferential direction of the stator core, and has a connecting piece toward the coil terminal at the bent portion, and the coil is connected to the connecting piece of the bus bar terminal A configuration in which a terminal is connected can be employed.

As connection means between the connection piece of the bus bar terminal and the coil terminal, well-known means such as caulking, adhesion, welding and the like can be adopted. In the case of caulking, as the shape of the connection piece, various conventionally known shapes can be considered, but for example, it can be U-shaped with the opening facing the side surface of the tooth.
Moreover, well-known TIG welding etc. can be employ | adopted for welding, In that case, a connection piece can be made into a flat plate piece shape etc. (refer FIG. 11).

In this configuration, the bus bar terminal is drawn out in the radial direction of the stator core, bent in the axial direction toward the stator core, and further bent along the circumferential direction of the stator core. The connecting piece provided in the above-described connection force is also buffered by the portion bent in the axial direction toward the stator core.
Further, if the bus bar terminal is bent so as to be along the circumferential direction of the stator core, the bus bar terminal is arranged on the same circumference concentric with the stator core, and the coil terminal is also routed on the same circumference. By making each connection with each coil terminal on the same circumference, the connection jig can be moved on the same circumference, and the connection workability is excellent.

  The connection structure between the coil terminal and the bus bar terminal can be individually applied to the connection between each phase bus bar terminal and the coil terminal. For example, the connection structure between the coil terminal and the bus terminal can be applied to the connection between the U phase bus bar terminal and the coil terminal. In addition, other connections can be made in a conventional manner, or applied to the connection between each terminal of the power supply bus bar and the coil terminal, and the connection between the terminal of the neutral point bus bar and the coil terminal can be made in the conventional manner. However, it is preferable to apply to connection between all terminals of the power supply bus bar and the neutral point bus bar and the coil terminal. In this way, there is an advantage that each connection point can be on the same circumference.

  In such a connection structure between the stator coil and the bus bar, when each bus bar is unitized, each bus bar is attached to the stator core only by providing the unit on the ring-shaped stator core. For example, the unit includes a ring-shaped bus bar that supplies power to each coil of each phase and a neutral point bus bar that connects the coils, and the power supply terminal and the neutral point terminal from each bus bar have a diameter of the stator core. The feed terminal and the neutral point terminal are further bent and bent along the circumferential direction of the stator core, or bent in the axial direction toward the stator core and further bent to It can be configured to bend along the circumferential direction and have a connecting piece at the bent end toward the winding start terminal or the winding end terminal.

When this unit is provided on the same axis of the stator core, each winding start terminal and each winding end terminal drawn out along the circumferential direction of the stator core are opposed to the connection pieces of the respective power supply terminals and neutral point terminals. The facing connection piece and the terminal are connected by an appropriate means.
As the shape of the connecting piece and the connecting means, as described above, well-known things such as U-shape, caulking, TIG welding, etc. are appropriately employed. In addition, the circumferential direction in which the bus bar terminal bends along the circumferential direction of the stator core may be on the same circumference concentric with the stator core, and the coil terminal may be routed on the same circumference.

In this bus bar unit, each bus bar may be made of a bar material, and may be arranged in parallel so as to be electrically insulated from each other in the holder and along the side surface of the stator core. The bar-shaped bus bar may have various cross-sectional shapes such as a perfect circular shape, an elliptical shape, and a polygonal shape.
Forming by punching from a metal plate is wasteful in material, but a rod is formed by drawing or the like, and is much cheaper than its punched product. Further, since the bar has shape retention, it can be easily formed into a ring shape.
The electrical insulation can be performed by partition walls between the bus bars provided in the holder, or can be performed by insulating coating the bar material forming the bus bar to form an insulated coated electric wire (cable). In the latter case, at the connection portion between each coil and the bus bar, the insulation of the bus bar is peeled off for the connection. Therefore, it is preferable to provide a partition to electrically insulate the connection portion. However, it is not necessary to provide a partition wall at the connection portion as long as the insulation between the bus bars is maintained by the insulation coating of the other bus bars.

Further, in the bus bar unit of this configuration, each power supply terminal and neutral point terminal are different from the bus bar, and the shape obtained by returning the bent portions to a flat plate shape is punched from the flat plate, and the punched piece is bent at each bent portion. It is good to be formed. Manufacture from a flat plate is easy, and the connecting action such as caulking is easier than that of a bar.
At this time, if the connecting piece is in a bent portion shifted laterally, the terminal is formed by punching / bending from the flat plate even if the connecting piece is provided at any position in the vertical direction with respect to the bent portion. Easy to manufacture. This is because, when the punching member from the flat plate is made into a terminal shape, the bent portion does not require an action such as twisting the bent portion (see FIGS. 8 and 10 to 11 (c) to (b)). .

These bus bar units include a ring-shaped stator core, a coil wound around each phase of the stator core teeth, and a ring-shaped bus bar unit provided on the same axis of the stator core. Can be used for busbar units.
At that time, if the connecting piece is U-shaped and the bus bar unit is provided on the ring-shaped stator core, each winding start terminal or each winding end terminal enters the U-shaped connecting piece. The connection work becomes easy. For that purpose, for example, the winding start terminal or winding end terminal of each coil is drawn out along the same circumference concentric with the stator core, and each power supply terminal and each neutral point terminal are also along the same circumference. Bend.

In this configuration, if the bus bar unit is stacked on the side surface of each tooth of the stator core, as described above, the bus bar is installed in the thick space on the tooth even if the yoke is thick. Therefore, it is advantageous for downsizing the stator.
At this time, each winding start terminal and each winding end terminal are drawn out along the same circumference on the side of the yoke of the stator core so as to be concentric with the stator core, and the feed terminal and the neutral point terminal are in the radial direction of the stator core. It is possible to adopt a configuration in which after being pulled out to reach the side surface of the yoke of the stator core, bent in the axial direction toward the side surface of the yoke and further bent along the same circumference.

  In the present invention, as described above, the lead terminals from the respective bus bars are drawn out in the radial direction of the stator core, further bent along the circumferential direction of the stator core, and the terminal of the coil is connected to the connecting piece at the bent end. As a result, the influence of the connection force on the bus bar when connecting the terminal and the coil terminal can be reduced, and the axial length of the stator can be shortened.

  1 to 4 show a rotating electrical machine stator A according to an embodiment of the present invention. The stator A for a rotating electrical machine includes a ring-shaped stator core 1 in which the divided cores 6 shown in FIG. 4 are arranged in an annular shape, a cylindrical housing 2 that clamps the stator core 1 from the outer periphery, and a ring-shaped ring that has the same axis as the stator core 1. It consists of a bus bar unit 3.

  As shown in FIGS. 3 and 4, the split core 6 includes a back yoke 4 and teeth 5 that extend inward in the stator radial direction from the back yoke 4. The coil 8 is wound around. The split core 6 is formed of a compact of a metal magnetic powder compact. The split yoke 6 is arranged in an annular shape as shown in FIG. 2, and the back yoke 4 is connected to form a ring-shaped yoke (stator core yoke). 9 is configured. Further, the back yoke 4 is thicker in the stator axial direction than the teeth 5, thereby ensuring a large cross-sectional area in the magnetic path formed by the yoke 9.

  As shown in FIG. 1, the insulator 7 includes a cylindrical portion 10 attached to the tooth 5, flange portions 11 and 12 formed at one end and the other end of the cylindrical portion 10, and a flange portion on the outer periphery side of the stator A. 12 includes an extending portion 13 that extends from the outer peripheral side to 12 and overlaps the end surface of the back yoke 4 in the axial direction. The cylindrical portion 10, the flange portions 11 and 12, and the extending portion 13 are all made of an insulating material resin and are integrally formed.

  The extending portion 13 includes a pair of winding start terminal locking pieces 14A and 14A facing each other on the same circumference c (see FIG. 1) concentric with the stator A (stator core 1), and also on the same circumference c. A pair of winding end terminal locking pieces 14B, 14B facing each other is formed, and slits 15A, 15B having one end (upper end) opened at the top of each winding start terminal locking piece 14A and each winding end terminal locking piece 14B. Are formed respectively. Each of the slits 15 </ b> A and 15 </ b> B is on the same circumference c concentric with the stator core 1.

In the coil 8, the winding start terminal 8 </ b> A and the winding end terminal 8 </ b> B are drawn out to the back yoke 4 side from the winding portion 8 </ b> C wound around the tooth 5, and the winding start terminal 8 </ b> A extends in the circumferential direction of the stator A. The winding end terminal locking piece 14A is press-fitted and locked in the slit 15A, and the winding end terminal 8B is also press-fitted into the winding end terminal locking piece 14B in the slit 15B while extending in the circumferential direction of the stator A. It has been stopped.
At this time, since the slits 15A and 15B are on the same circumference c concentric with the stator core 1, the terminals 8A and 8B fitted (press-fitted) into the slits 15A and 15B are the same as the stator core 1. Located on the same circumference c of the heart (along the same circumference c).

  As shown in FIGS. 5 and 6, the bus bar unit 3 includes ring-shaped power supply bus bars 16U, 16V, and 16W made of bars arranged concentrically in order from the outer peripheral side to the inner peripheral side, and each power supply bus bar. From the ring-shaped neutral point bus bar 16N made of the same bar, which is arranged on the outer peripheral side than 16U, 16V, and 16W, and the power supply bus bars 16U, 16V, and 16W and the holder 17 that holds the neutral point bus bar 16N Become. The power supply bus bars 16U, 16V, and 16W are respectively provided with primary-side terminals 18U, 18V, and 18W that are connected to three-phase AC U, V, and W-phase power supplies. The neutral point bus bar 16N can be the innermost side (the inner side of the power supply bus bar 16W). In this embodiment, the rod-shaped member is formed in a ring shape to form each bus bar 16U, 16V, 16W, 16N, and both ends of the ring-shaped rod-shaped member are drawn out in the radial direction of the stator A, Terminals 18U, 18V, and 18W are formed.

  The bus bar unit 3 includes a power supply terminal 19B extending from the power supply bus bar 16U to the outer peripheral side, a power supply terminal 19B extending from the power supply bus bar 16V to the outer peripheral side, and a power supply bus bar 19W extending from the power supply bus bar 19W to the outer peripheral side. The power supply terminal 19B is provided in order in the circumferential direction, and a neutral point terminal 19A extending from the neutral point bus bar 16N to the outer peripheral side is provided between the adjacent power supply terminals 19B and 19B. These terminals 19A and 19B are formed by punching a shape obtained by returning the following bent portions 21 into flat plate shapes from a flat plate, and bending the punched pieces 19 'at the respective bent portions 21 (from FIG. 8C to (b) )reference). The terminals 19A, 19B are connected and fixed to the bus bars 16U, 16V, 16W, 16N by welding or the like.

  As shown in FIGS. 5, 6, and 8 (b), the neutral point terminals 19 </ b> A and the power supply terminals 19 </ b> B extend (extracted) from the bus bars 16U, 16V, 16W, and 16N to the outer peripheral side. Bending from the protruding portions 20 and 20 and the extending portions 20 and 20 along the same circumference c, opening toward the winding start terminal 8A or winding end terminal 8B at the ends of the bending portions 21 and 21 U-shaped connecting pieces 22, 22 are formed, and the connecting pieces 22, 22 are crimped in the radial direction of the stator A (a arrow direction in FIG. 9), and further, the crimped portion is energized and softened. The connection piece 22 is firmly connected to the terminals 8A and 8B of the coil 8 locked to the terminal locking pieces 14A and 14B by resistance welding the connection piece 22 and the coil terminals 8A and 8B.

As shown in FIG. 6, the holder 17 includes a partition wall 23 extending in the circumferential direction of the stator between the power supply bus bar 16U and the neutral point bus bar 16N. The partition wall 23 extends from the position of the power supply terminal 19B extending from the power supply bus bar 16U to the position of the neutral point terminal 19A adjacent to the power supply terminal 19B in the circumferential direction. A groove 24 that is continuous in the circumferential direction is formed.
By forming the groove 24 in the partition wall 23, the creepage distance between the power supply bus bar 16U and the neutral point bus bar 16N is large, and the insulation reliability between the power supply bus bar 16U and the neutral point bus bar 16N is increased. It will be excellent.

This stator A for rotating electrical machines is assembled as follows, for example. First, the coil 8 is wound around the split core 6 via the insulator 7, and the winding start terminal 8A of the coil 8 is locked to the slits 15A and 15A of the pair of winding start terminal locking pieces 14A and 14A. The winding end terminal 8B is locked to the slits 15B and 15B of the pair of winding end terminal locking pieces 14B and 14B.
The split core 6 with the coil 8 is arranged in an annular shape (ring shape), and the housing 2 is shrink-fitted on the outer periphery thereof to constitute the ring-shaped stator core 1.

Next, as shown by the arrows in FIG. 7, the bus bar unit 3 is arranged on the same axis on the stator core 1, and the winding start terminal 8A of each coil 8 is placed in the connection piece 22 of each neutral point terminal 19A. At the same time, the winding end terminal 8B of each coil 8 is introduced into the connection piece 22 of each power supply terminal 19B.
The terminals 8A and 8B are introduced into the connecting piece 22 in such a manner that the stator core 1 and the bus bar unit 3 are ring-shaped on the same axis, and the terminals 19A and 19B and the coil terminals 8A and 8B are concentric with the stator core. Since it is along the circumference c, it is made smoothly.
Further, at the time of introduction, even if there is a deviation in the circumferential direction (direction in FIG. 9b) between the both terminals 8A, 8B and the connection piece 22, at the same circumference c between the terminals 8A, 8B and the connection piece 22. If there is an overlap, there is no problem. For this reason, the lengths along the same circumference c of the terminals 8A and 8B are appropriately set so that the degree of overlap always occurs.

With the terminals 8A and 8B being introduced into the connection piece 22, as shown in FIG. 9, the connection pieces 22 of both terminals 19A and 19B are caulked with the crimping tool D and joined to the coil terminals 8A and 8B ( Connecting.
At this time, a caulking force acts in the direction of the arrow a in FIG. 10. This caulking force is bent along the same circumference c of the terminals 19A and 19B (displaced laterally at right angles to the caulking direction). ) It is applied to the bus bars 16U, 16V, 16W, 16N from the bent portion 21 through the extended portion 20, and the caulking force is somewhat relaxed and extended due to the bending / deformation of the bent portion 21 in the a direction. Since it is transmitted to the bus bar through the outlet 20, the caulking force is not easily applied to the bus bar, and there is little possibility that a connection failure between the terminals 19A, 19B and the bus bars 16U, 16V, 16W, 16N will occur.
Further, the displacement of the connection piece 22 or the terminals 8A and 8B in the circumferential direction (direction b in the figure) at the time of the caulking does not cause any trouble unless the terminals 8A and 8B are detached from the connection piece 22.
Further, since the connecting pieces 22 of the terminals 19A and 19B and the terminals 8A and 8B are on the same circumference c and the direction of caulking (the radial direction of the stator A) is the same, the caulking jig is attached to the same circumference. c, since the neutral point terminal 19A and the winding start terminal 8A can be connected in the same manner as the connection between the feeding terminal 19B and the winding end terminal 8B, the connection piece 22 and the terminal 8A, The workability of connection with 8B is good.

  As shown in FIG. 3, the connection states of the terminals 19A, 19B and the coil terminals 8A, 8B are as follows. The power supply bus bars 16U, 16V, 16W and the neutral point bus bar 16N (bus bar unit 3) are placed on the teeth 5. The overlapping arrangement does not overlap the back yoke 4 (yoke 9). Therefore, even if the thickness of the back yoke 4 in the stator axial direction is larger than that of the teeth 5, the axial thickness of the stator A is difficult to increase, and the installation space for the stator A (the axial length of the stator A) Can be suppressed.

  In the above embodiment, since the divided core 6 is a molded product made of a green compact of metal magnetic powder, it is easy to make the thickness of the back yoke 4 larger than that of the teeth 5, but the ring-shaped electromagnetic The stator core 1 is formed of a laminate of steel plates, and the number of back yokes 4 (yoke 9) of the stator core 1 is increased more than the number of teeth 5 to make the thickness of the yoke 9 in the stator A axial direction the teeth. The stator core 1 can be made larger than 5. The split core 6 can also be made the stator core 1 by the split core 6 as a laminated body of similar electromagnetic steel sheets.

  Further, in the above embodiment, the winding start terminal 8A of the coil 8 is connected to the neutral point terminal 19A and the coil winding end terminal 8B is connected to the power supply terminal 19B, but the winding start terminal 8A of the coil 8 is fed. It is also possible to connect the coil winding end terminal 8B to the neutral point terminal 19A while being connected to the terminal 19B.

  Furthermore, in the above embodiment, two coils are wound in parallel to increase the space factor of the coil 8. However, one coil 8 may be wound, and conversely, three coils are wound. It can also be set as above.

Further, if the neutral point terminal 19A and the power supply terminal 19B are pulled out in the radial direction of the stator core 1 and then bent along the same circumference c, the connecting point 22 is provided at the bent end. As long as there is no risk of poor connection between the terminals 19A and 19B and the bus bars 16W, 16V, 16U, and 16N, the mode is arbitrary. For example, FIGS. 10A to 10C are conceivable. .
However, as shown in FIG. 8 and FIG. 10, the end portion of the extending portion 20 is bent and a bent portion 21 is formed from the distal end portion to reach the middle of the U-shaped connection piece 22 (FIG. 8 ( If the bent portion 21 shown in b) and one piece of the connecting piece 22 are in a T-shaped form indicated by a chain line in FIG. 2, the caulking force of the connecting piece 22 is buffered even in the bent portion 21 ′ of the extending portion 20. Therefore, the fear of the above-mentioned connection failure is less likely to occur. In this case, the bent portion 21 ′ has a higher buffering action as shown in FIG. 8 than in FIG. 10 (since FIG. 10 is only bent by the plate thickness), there is a risk of poor connection. Few.

  As a connection mode between the connection piece 22 and the coil terminals 8A and 8B, a well-known one other than the above caulking can be adopted. For example, as shown in FIG. 11, TIG welding can also be used. That is, the connection piece 22 is formed in a flat plate shape, and the coil terminals 8A and 8B are placed along the connection piece 22 and both are welded by the TIG welding machine E as shown in FIG. In this case, the coil terminals 8A and 8B may be started up as shown in FIG. 11 after being routed along the circumferential direction of the stator core 1 or along the same circumference c. May be.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

The top view of one Embodiment of the stator for rotary electric machines concerning this invention Cross-sectional view of the same embodiment Main part cutting front view of the same embodiment Main part cutting perspective view of the same embodiment Plan view of the bus bar unit of the same embodiment The principal part expansion perspective view of the bus bar unit Assembly explanatory diagram of the same embodiment The terminal of the embodiment is shown, (a) is a left side view, (b) is a perspective view of the main part, (c) is a plan view of a punched state from a flat plate before molding Caulking action diagram of the terminal The other example of the terminal of the embodiment is shown, (a) is a left side view, (b) is a perspective view of the main part, (c) is a plan view of a punched state from a flat plate before molding The connection state of the bus-bar terminal and coil terminal of other embodiment is shown, (a) is a principal part perspective view, (b) is a side view.

Explanation of symbols

1 Stator Core 3 Bus Bar Unit 5 Teeth 6 Divided Core 7 Insulator 8 Coil 8A, 8B Coil Terminals 16U, 16V, 16W Power Supply Bus Bar 16N Neutral Point Bus Bar 17 Holder 19B Power Supply Terminal 19A Neutral Point Terminal 20 Exit)
21 bending part 22 connection piece D crimping tool E TIG welding machine

Claims (5)

Electricity is fed to the winding start terminal (8A) and winding end terminal (8B) of each coil (8) of the ring-shaped stator core (1) of the rotating electrical machine, and to each coil (8) provided on the same axis of the stator core (1). From the ring-shaped bus bar (16U, 16V, 16W) and the neutral point bus bar (16N) connecting the coils (8) provided on the same axis to the stator core (1). A connection structure with a neutral point terminal (19A),
The power supply terminal (19B) and the neutral point terminal (19A) are drawn out in the radial direction of the stator core (1) and further bent along the circumferential direction of the stator core (1). ) Having a connection piece (22) directed toward the winding start terminal (8A) or the winding end terminal (8B),
The stator for a rotating electrical machine, wherein the winding start terminal (8A) or the winding end terminal (8B) is connected to the connecting piece (22) of each of the power supply terminals (19B) or the neutral point terminal (19A). Connection structure for busbar terminals and coil terminals.   The power feeding terminal (19B) and the neutral point terminal (19A) are drawn out in the radial direction of the stator core (1), bent in the axial direction toward the stator core (1), and further the stator core (1). The connection structure between the bus bar terminal and the coil terminal of the stator for a rotating electrical machine according to claim 1, wherein the connection structure is bent along the circumferential direction. A feed terminal (19B) and a neutral point terminal (19A) of the stator (A) for a rotating electrical machine according to claim 1 or 2, and a winding start terminal (8A) and a winding end terminal (8B) of the coil (8). A bus bar unit (3) for forming a connection structure,
Each bus bar (16U, 16V) includes a ring-shaped bus bar (16U, 16V, 16W) for supplying power to each coil (8) and a neutral point bus bar (16N) for connecting the coils (8). , 16W, 16N), the feed terminal (19B) and the neutral point terminal (19A) are respectively drawn out in the radial direction of the stator core (1),
Each of the power supply terminals (19B) and the neutral point terminal (19A) is further bent along the circumferential direction of the stator core (1), or is bent in the axial direction toward the stator core (1). It bends along the circumferential direction of the stator core (1), and has a connecting piece (22) toward the winding start terminal (8A) or winding end terminal (8B) at the bending part (21). A bus bar unit for stators of rotating electrical machines. A ring-shaped stator core (1), a coil (8) wound around each tooth (5) of the stator core (1) for each phase, and a ring-shaped busbar unit provided on the same axis on the stator core (1) (3) a stator for a rotating electrical machine,
The said ring-shaped bus-bar unit (3) is a bus-bar unit of Claim 3, The winding start terminal of the said coil (8) to the connection piece (22) of each electric power feeding terminal (19B) or neutral point terminal (19A) (8A) or a winding end terminal (8B) is connected to the stator for a rotating electrical machine.   The stator for a rotating electrical machine according to claim 4, wherein the bus bar unit (3) is overlapped on a side surface of each tooth (5) of the stator core (1).

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