JP2008278704A - Stator for rotating electrical machine, connection structure between coil terminal and bus bar terminal, and connection method thereof - Google Patents

Abstract

An object of the present invention is to reduce the influence of a caulking force between connecting terminals 19A, 19B of bus bars 16U, 16V, 16W, 16N and coil terminals 8A, 8B on the bus bar.
A U-shaped connecting piece 22 of a lead terminal from each bus bar is caulked and connected to a coil terminal of each phase routed along the same circumference c concentric with the stator core 1. The pair of locking pieces 14A ₁ , 14A ₂ , 14B ₁ , 14B ₂ that support the coil terminals 8A, 8B are forwardly provided in the coil pulling direction 14A ₂ , 14B ₂ , and the terminals 8A, 8B are slits 15A, 15B. Because of the play, the coil terminals 8A and 8B move so that the bent lines of the opposing pieces at both ends of the connection piece 22 coincide with the line directions of the coil terminals. Minimize the movement of 19A and 19B. For this reason, the force applied to the terminals 19A and 19B is reduced as compared with the case where the coil terminal is stationary, and the connection failure between the bus bar terminals 19A and 19B and the bus bar 16W is difficult to occur.
[Selection] Figure 4

Description

  The present invention relates to a rotating electrical machine stator incorporated in a hybrid vehicle, a fuel cell vehicle, and the like, a connection structure between a coil terminal of the stator and a bus bar terminal, and a connection method thereof.

Hybrid vehicles and fuel cell vehicles use rotating electrical machines as drive units and regenerative brakes. As an example of a stator incorporated in the rotating electrical machine, a ring-shaped yoke 9 and teeth extending radially inward from the yoke 9 will be described with reference to FIGS. 5 for a rotating electrical machine having a stator core 1 composed of 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 disposed concentrically with the stator core 1. A stator is known (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.
Thus, by making each connection between each power supply terminal and each neutral point terminal and each coil terminal on the same circumference c, the connection jig can be moved on the same circumference c, etc. 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

The connection between the power supply terminal 19B and the neutral point terminal 19A and the terminals 8B and 8A of each coil 8 in this conventional stator for a rotating electric machine is obtained by drawing out a plate-like power supply and neutral point terminal from each bus bar. This is done by bending the lead-out end of the coil into a downward U-shape, placing the end of the coil in the U-shaped connection piece, and crimping the connection piece. At that time, the coil terminals are locked in a bridging state between the pair of terminal locking pieces by being inserted into the slits of the pair of terminal locking pieces opposed in the pulling direction (Patent Literature). 1 See FIGS. 3 and 7).
In the conventional state of locking the coil terminal, the coil terminal is fixedly pressed into the slits of the pair of both terminal locking pieces to increase the locking strength.

When the U-shaped connecting piece is caulked and connected to the coil terminal spanned between the two terminal locking pieces, the opposing pieces at both ends of the U-shaped portion of the connecting piece are bent in the middle. However, it is rare when the bent line coincides with the line direction of the coil terminal at the time of the caulking. For this reason, with the caulking action, the coil terminal and the connecting piece (terminal of the bus bar) move in the matching direction so that the bending direction and the line direction of the coil terminal match as much as possible.
At this time, as described above, if the coil terminal is stationary, the connecting piece is forced to move, and if the connecting piece moves, the moving direction of the connecting piece is usually the pulling-out direction of the bus bar terminal. There is a risk that a caulking force acts in the direction, causing 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.
Note that the influence of the caulking force on the bus bar and the problem that the connection 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 connection piece and the coil terminal by TIG welding or the like (FIG. 12). reference).

  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 ensure a sufficient cross-sectional area of the magnetic path formed by the yoke, this bus bar unit is thicker in the stator axial direction than the teeth (see FIG. 3 of this application). The bus bar unit is further placed on the upper portion, and the axial thickness of the stator is increased.

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

  In order to solve the first problem described above, the present invention is similar to the prior art in that when the coil terminals are supported by being inserted into the slits of the pair of terminal locking pieces, The coil terminal in front of the pulling direction supports the terminal immovably through the slit, and the one in front of the pulling direction supports the terminal with play (clearance) through the slit. is there.

If the coil ends are supported in a bridging manner with a pair of terminal locking pieces, the coil terminal is normally bent and locked to the pair of terminal locking pieces, and the bent state is supported by the pair of terminal locking pieces. Since it is maintained at a point, the pulling force can be sufficiently resisted by the frictional force with the inner surface of the slit due to the bending and the press-fitting into one terminal locking piece. For this reason, if the terminal is fixedly supported by the terminal locking piece in front of the pulling direction through the slit, the terminal locking piece in the front of the pulling direction supports the terminal with play through the slit. Does not affect the support strength.
On the other hand, when connecting the connecting piece to the coil terminal spanned between the two terminal locking pieces by caulking or welding, the coil terminal is one terminal locking piece in front of the pulling direction. In a state of being securely supported, the portion ahead of the support point is supported by the play of the other terminal locking pieces so that the line direction of the connecting piece and the coil terminal coincide within the play range. Therefore, the terminal of the bus bar does not need to move, and the force applied to the terminal at the time of connection is less than that when the coil terminal is stationary.

As means for achieving the second problem, 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 axis 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 advantageous.

  As a specific configuration for achieving each of the above problems, in the connection structure in which the terminal of each coil of the ring-shaped stator core of the rotating electrical machine and the terminal of the ring-shaped bus bar are connected on the side surface of the stator core, the side surface of the stator core A pair of terminal locking pieces opposed on the circumference along the same circumference of the same core as the stator core is provided according to the number of connections between the terminals of the coils and the terminals of the bus bars. Each terminal locking piece is formed with a slit into which each coil terminal is inserted and locked, and each coil terminal is routed along the same circumference on the side surface of the stator core and faces the opposite terminal. Inserted into the slit of the locking piece and locked in a bridging state between the pair of terminal locking pieces, and the pair of terminal locking pieces in front of the coil terminal in the pulling direction are Terminal A pair of terminals that are supported immovably through the slits and that support the terminals with play in the front in the pulling direction, and in which the connecting pieces of the bus bar terminals are along the same circumference. The structure connected to each coil terminal between locking pieces is employable.

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.
When the connection piece is U-shaped, the terminal of each coil along the same circumference enters the connection piece of each terminal of the bus bar, and the connection piece is crimped and connected to each terminal. It can be set as the structure which has.
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. 12).

In these configurations, the terminal of the bus bar is drawn out in the radial direction of the stator core, further bent along the same circumference, and the terminal of the coil is connected to the connecting piece at the bent end. The force at the time of connection is applied to the bus bar through the lead-out portion from the bent portion of the terminal along the same circumference, and the connection force is small due to the bending of the bent portion with respect to the pull-out portion. Since it is alleviated and transmitted to the bus bar through the lead-out portion, the connection force is less likely to be applied to the bus bar, and the possibility of poor connection between the terminal and the bus bar is reduced.
At this time, if the terminal of the bus bar is pulled out in the radial direction of the stator core, bent toward the stator core in the axial direction and further bent along the same circumference, the connecting piece provided at the tip is The connection force is also buffered by the portion bent in the axial direction toward the stator core.

  In addition, the bent portion of the lead terminal from each bus bar that is bent along the same circumference described above is shifted laterally from the lead-out direction of the terminal, and the connecting piece provided at the tip is shifted in the horizontal direction. Since it can be provided at an arbitrary position in the vertical direction with respect to the bent portion (see FIGS. 3 and 11 of the present application), it can be suppressed from being as high as possible with respect to the lead-out 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.

The connection structure between the terminal of the coil and the terminal for the bus bar can be applied individually to the connection between the bus bar for each phase and the coil terminal. For example, it can be applied to the connection between the terminal for the U-phase bus bar and the coil terminal. The other connection may be another known aspect or applied to the connection between each terminal of the power supply bus bar and the coil terminal, and the connection between the neutral point bus bar terminal and the coil terminal may be another known aspect. However, it is preferably applied 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.
When the connection structure of the present invention is applied to the connection between all terminals of the power supply bus bar and the neutral point bus bar and the coil terminal, the connection structure is a ring shape in which the bus bar terminal supplies power to each coil of each phase. It consists of a power supply terminal and a neutral point terminal drawn from the neutral point bus bar connecting the bus bar and each coil, and the coil terminal becomes a winding start terminal or each winding end terminal, and each of the power supply terminal and each neutral point terminal Each winding start terminal or each winding end terminal along the same circumference is connected to the connection piece.

  Such a connection structure between the stator coil and the bus bar can be easily achieved by providing each unit in the ring-shaped stator core when each bus bar is unitized. For example, the unit includes a ring-shaped bus bar that supplies power to each of the coils and a neutral point bus bar that connects the coils, and the power supply terminal and the neutral point terminal extend from the bus bar in the radial direction of the stator core. Each of the feeding terminals and the neutral point terminals is pulled out and bent further and bent so as to follow the circumferential direction of the same circle, or pulled out and axially toward the stator core. And a U-shaped connecting piece that opens toward the winding start terminal or the winding end terminal at the bent end. When the unit is provided on the same axis of the stator core, each winding start terminal and each winding end terminal that are routed along the circumferential direction of the same circle that is concentric with the stator core It may configured to enter into the connection piece of the feeding terminals and the neutral point terminal.

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. In addition, since the rod 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.

Each terminal of the bus bar is different from the bus bar, and is preferably formed by punching a shape obtained by returning each bent portion to a flat plate shape from a flat plate and bending the punched piece at each bent portion (this application). FIG. 11 (c) to (b)). Fabrication from a flat plate is easy, and the connecting action by caulking or the like of the terminal composed of the flat plate is easier than that of a bar (see FIG. 10 of the present application).
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. The stator for a rotating electrical machine can be used for a bus bar unit, and the winding start terminal or the winding end terminal of each coil is routed along the same circumference concentric with the stator core. In addition, each winding start terminal or each winding end terminal along the same circumference is connected to the connection piece of each neutral point terminal.

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 that is drawn out to reach the side surface of the yoke of the stator core, is bent in the axial direction toward the side surface of the yoke, and is further bent along the same circumference.

  In addition, in a stator for a rotating electrical machine comprising each coil of a ring-shaped stator core, a ring-shaped bus bar that supplies power to each coil provided on the same axis of the stator core, and a neutral point bus bar that connects the coils. The connection between the winding start terminal and the winding end terminal of each coil and the power supply terminal and neutral point terminal drawn out from each ring-shaped bus bar can be the connection structures described above.

  Further, in the method of connecting the winding start terminal and winding end terminal of each coil in the stator for a rotating electrical machine to the power supply terminal and neutral point terminal drawn from each ring bus bar, each ring bus bar is integrated. The power supply terminal and the neutral point terminal are pulled out from each bus bar to form a bus bar unit, and the bus bar unit is placed on the side surface of the stator core. It is possible to adopt a configuration in which a start terminal and each winding end terminal are inserted, and then both pieces of each connection piece are brought close together and caulking, and the connection piece is connected to each winding start terminal and each winding end terminal by the caulking.

At this time, one piece of the U-shaped connecting piece on the axial center side of the stator is facing downward, and the other piece is opened at 90 degrees or more with respect to the one piece. If it is placed on the side surface of the stator core, the insertion of each winding start terminal and each winding end terminal into each connection piece along with the placement of the bus bar unit on the side surface of the stator core becomes smooth, This is advantageous for automation of the work.
In addition, after crimping each connection piece, by energizing the crimped portion, the energized portion is softened and the adhesion between the two pieces is increased, and the connection piece (terminal) and the coil terminal are resistance welded, The electric joining force is improved.

Since the coil terminal can be moved as described above, the present invention can reduce the influence of the caulking force on the bus bar when the bus bar terminal and the coil terminal are connected by caulking.
Further, by arranging the bus bars in parallel along the side surface of the stator core, the axial length of the stator can be shortened.

  1 to 5 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 bus bar unit 3. .

  As shown in FIGS. 3 and 4, the split core 6 includes a back yoke 4 and a tooth 5 extending inward in the stator A radial direction from the back yoke 4, and the tooth 5 via an insulator 7. A coil 8 is wound. 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 of the magnetic path formed by the yoke 9.

  As shown in FIG. 3, 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 12 on the stator outer peripheral side. The extended portion 13 extends from the outer periphery to the outer peripheral side and overlaps the axial end surface of the back yoke 4. The cylindrical part 10, the flange parts 11 and 12, and the extending part 13 are all made of an integrally molded product of resin as an insulating material.

As shown in FIG. 3, the extending portion 13 has a pair of winding start terminal locking pieces 14A ₁ opposed to each other on the same circumference c (see FIGS. 1 and 4) concentric with the stator A (stator core 1). , 14A ₂ and a pair of winding end terminal locking pieces 14B ₁ , 14B _{2 which} are also opposed on the same circumference c, and are provided with each winding start terminal locking piece 14A ₁ , 14A ₂ and each winding end terminal. Long slits 15A and 15B are formed in the locking piece 14B ₁ and 14B ₂ in the axial direction of the stator A, one end of which is open. The respective locking pieces 14A ₁ , 14A ₂ , 14B ₁ , 14B ₂ face each other along the same circumference c, so that the slits 15A, 15B are located on the same circumference c concentric with the stator core 1.

In the coil 8, the winding start terminal 8A and the winding end terminal 8B are drawn from the winding portion 8C wound around the tooth 5 to the back yoke 4 side, and the winding start terminal 8A extends in the circumferential direction of the stator A. in both the winding start terminal locking pieces 14A _1, 14A ₂ to the slit 15A of the pair is locked in a passing state bridged by inserting 15A, also winding end terminal 8B, in a state extending in stator a circumferential direction The pair of winding end terminal locking pieces 14B ₁ and 14B ₂ are locked in a bridged state by being inserted into the slits 15B and 15B.

At this time, since the slits 15A and 15B are located on the same circumference c concentric with the stator core 1, the terminals 8A and 8B fitted in the slits 15A and 15B are concentric with the stator core 1. Located on circumference c (along the same circumference c).
Further, in the pair of terminal locking pieces 14A ₁ , 14A ₂ , 14B ₁ , 14B ₂ , the ones in front of the coil terminal in the pulling direction (front sides 14A ₁ , 14B ₁ in FIG. 4) are shown in FIG. As shown, the depth t of the slits 15A and 15B is set to be smaller than the diameter of the coil 8, and the side edges thereof bite into the coil 8 to support the coil terminals 8A and 8B in a stationary manner. things (front side _14A 2, 14B ₂ in FIG. 4), as shown in FIG. 5 (b), the slit 15A, the back of the width t of the 15B is set slightly larger than the diameter of the coil 8, the coil 8 The coil terminals 8A and 8B are supported in the slits 15A and 15B so as to be movable in the lateral direction, that is, with play.

  As shown in FIGS. 6 and 7, 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 into a flat plate shape from a flat plate, and bending the punched piece at each bent portion (see FIGS. 11B and 11C). . 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. 7, 8, and 11, the neutral point terminals 19 </ b> A and the power supply terminals 19 </ b> B extend from the bus bars 16U, 16V, 16W, and 16N to the outer peripheral side (extracted). , 20 and the extended portions 20 and 20 are bent along the same circumference c, and U-shaped opening at the ends of the bent portions 21 and 21 toward the winding start terminal 8A or the winding end terminal 8B. The connection pieces 22 and 22 are formed, and by connecting the connection pieces 22 and 22 in the radial direction of the stator A, the connection pieces 22 and 22 are connected to the terminals 8A and 8B of the coil 8 locked to the slits 15A and 15B. .

As shown in FIG. 7, the holder 17 has 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 excellent. It will be a thing.

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 8 </ _b > A of the coil 8 is started and locked to the slit 15 </ _b > A of the terminal locking pieces 14 </ _b > A ₁ and 14 </ _b > A _2. The terminal 8B is locked to the slit 15B of the terminal locking pieces 14B ₁ and 14B _{2 at} the end of winding.
At this time, in the pair of terminal locking pieces 14A ₁ , 14A ₂ , 14B ₁ , 14B ₂ , those in front of the coil terminal in the drawing direction (14A ₁ , 14B ₁ ) have a width t behind the slits 15A, 15B. Since it is set smaller than the diameter of the coil 8, its side edge bites into the coil 8 to support the coil 8 immovably, while the one in front of the pulling direction (14 A ₂ , 14 B ₂ ) and the slits 15 A, 15 B Since the inner width t is set slightly larger than the diameter of the coil 8, the coil 8 is supported with play in the slits 15A and 15B.
The divided core 6 with the coil 8 is arranged in an annular 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 arrow in FIG. 8, the bus bar unit 3 is arranged on the same axis on the stator core 1, and as shown in FIG. 9, each neutral point terminal 19A is connected to the winding start terminal 8A of the coil 8. And the connection piece 22 of each power supply terminal 19B is applied to the coil winding end terminal 8B.
At this time, the connecting piece 22 has the one piece 22A on the axial center side of the stator core 1 facing downward, and the other piece 22B is opened 90 degrees or more with respect to the one piece. When arrange | positioning on the same axis | shaft on the stator core 1, each winding start terminal 8A and each winding end terminal 8B can be smoothly inserted in each connection piece 22. FIG.

  Thereafter, as shown in FIG. 10, the crimping jig 31 faces the one connection piece 22, and one piece 31 </ b> A of the jig 31 is placed behind the one piece 22 </ b> A facing the U-shaped connection piece 22 (stator A). And the other piece 31B of the jig 31 is positioned on the other piece 22B, so that one piece of the jig 31 is positioned as shown in FIGS. While supporting the lower edge of the one piece 22A of the connection piece 22 with 31A, the other piece 22B of the connection piece 22 is plastically deformed toward the one piece 22A with the other piece 31B of the jig 31, and caulking, The caulking portion is energized and softened, and the connection piece 22 and the coil terminals 8A and 8B are resistance-welded to firmly connect the connection piece 22 to the coil terminals 8A and 8B.

At this time, the pair of locking pieces 14A ₁ , 14A ₂ , 14B ₁ , 14B ₂ supporting the coil terminals 8A, 8B in the front direction of the coil 14A ₂ , 14B ₂ has their terminals 8A, 8B slit 15A. 15B, the coil terminals 8A and 8B are bent by a bent line a of the opposing pieces 22A and 22B at both ends of the U-shaped connecting piece 22 (FIG. 10A). In order to suppress the movement of the bus bar terminals 19A and 19B as much as possible, the force applied to the terminals 19A and 19B is the same as that of the coil terminals 8A and 8B. Less than in some cases. For this reason, poor connection between the bus bar terminals 19A and 19B and the bus bar 16W is difficult to occur.

In particular, since the opposing pieces 22A and 22B of the connecting piece 22 are opened by 90 degrees or more, the bent wire a of the opposing pieces 22A and 22B of the connecting piece 22 and the line directions of the coil terminals 8A and 8B are the same at the time of caulking. Although it is difficult to do so, since the coil terminals 8A and 8B can move so as to coincide with each other, the movement of the bus bar terminals 19A and 19B is suppressed as much as possible, and the connection between the bus bar terminals 19A and 19B and the bus bar 16W. Is unlikely to occur. Further, as can be understood from FIG. 10, the other piece 22B having the moving space is moved and caulked, so that the caulking work is also smooth.
In addition, it is preferable that the caulking connection part of the connection piece 22 and coil terminal 8A, 8B strengthens the connection and improves electroconductivity by application | coating of a conductive adhesive.

Since the locking pieces 14A ₂ and 14B ₂ forward in the coil drawing direction in this embodiment support the terminals 8A and 8B with play not only in the horizontal direction but also in the vertical direction in the slits 15A and 15B. The action of relieving the force in the vertical direction is also exerted by the movement in the vertical direction. As the play direction, a lateral direction, a vertical direction, an oblique direction, and the like are appropriately selected in consideration of the caulking direction.

Further, at the time of the caulking, the caulking force is applied to the bus bars 16W, 16V, 16U, 16N from the bent portion 21 along the same circumference c via the extending portion 20, and the extending portion of the bent portion 21 Because the caulking force is not less relaxed and is transmitted to the bus bars 16W, 16V, 16U, and 16N through the extending portion 20 due to the bending / deformation of the terminal 20, the terminals 19A and 19B and the bus bars 16W, 16V, 16U, and 16N There is little risk of poor connection.
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 crimping (the radial direction of the stator A) is the same, the crimping jig 31 is attached to the same circle. The connection of the neutral point terminal 19A and the winding start terminal 8A and the connection of the power supply terminal 19B and the winding end terminal 8B can be performed by the same operation only by moving to the periphery. 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.

  In the above embodiment, the coil 8 winding start terminal 8A 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 coil winding start terminal 8A is connected to the power supply terminal 19B. It is possible to connect the winding end terminal 8B of the coil 8 to the neutral point terminal 19A while being connected to 19B.

  Furthermore, in the above embodiment, two coils are wound in parallel. However, one coil 8 may be wound, and conversely, three or more coils may be wound.

  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. 12, 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. 12 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 The cutting front view of the latching piece part of the coil terminal of the 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 Main part cutting front view for assembly explanation of the embodiment Caulking connection explanatory diagram of bus bar terminal and coil terminal of the same embodiment The bus-bar terminal of the embodiment is shown, (a) is a left side view, (b) is a perspective view of the main part, and (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 busbar unit 4 back yoke 5 teeth 6 split cores 8 coil 8A, terminal 9 stator core 8B coil yoke _14A 1, 14B ₁ coil withdrawing direction before the coil terminal locking pieces _14A 2, 14B ₂ coils drawer forward of the coil Terminal locking pieces 15A, 15B Slits 16U, 16V, 16W of coil terminal locking pieces Power supply bus bar 16N Neutral point bus bar 17 Holder 19B Power supply terminal 19A Neutral point terminal 20 Terminal lead-out part (extension part)
21 Bent part 22 Connection piece 22A One piece of connection piece 22B Other piece of connection piece 31 Caulking jig

Claims (5)

A winding start terminal (8A) and a winding end terminal (8B) of each coil (8) of the ring-shaped stator core (1) of the rotating electrical machine, and each coil (8) provided on the same axis of the stator core (1). A power supply terminal (19B) drawn out from a ring-shaped bus bar (16U, 16V, 16W) that feeds power and a ring-shaped bus bar (16N) that connects the coils (8) provided on the same axis to the stator core (1). A connection structure for connecting a neutral point terminal (19A) on the side surface of the stator core (1),
A pair of terminal locking pieces (14A ₁ , 14A ₂ ) facing on the circumference (c) along the same circumference (c) concentric with the stator core (1) on the side surface of the stator core (1). , 14B ₁ , 14B ₂ ) are provided according to the number of connections between the terminals (8A, 8B) of the coils (8) and the terminals (19B, 19A,) of the bus bars (16U, 16V, 16W, 16N). is, the respective terminal locking pieces _{(14A 1, 14A 2, 14B} 1, 14B 2) , a slit each terminal of each coil (8) (8A, 8B) is locked is inserted (15A, 15B) Is formed,
The terminals (8A, 8B) of the coils (8) are routed along the same circumference (c) on the side surface of the stator core (1), and the opposing pair of terminal locking pieces (14A _1). , 14A ₂ , 14B ₁ , 14B ₂ ) are inserted into the slits (15A, 15B) and locked between the pair of terminal locking pieces (14A ₁ , 14A ₂ , 14B ₁ , 14B ₂ ) Has been
And the terminal locking pieces of the pair _{(14A 1, 14A 2, 14B} 1, 14B 2) lead-out direction front of the terminal of the coil (8) (8A, 8B) of those _(14A 1, _14B 1,) is The terminals (8A, 8B) are immovably supported via the slits (15A, 15B), and the ones (14A ₂ , 14B ₂ ) in the leading direction are connected to the slits (15A, 8B). 15B) is supported with play through
Each coil terminal between the pair of terminal locking pieces (14A ₁ , 14A ₂ , 14B ₁ , 14B ₂ ) where the connecting piece (22) of each bus bar terminal (19A, 19B) is along the same circumference (c) (8A, 8B). A connection structure between a bus bar terminal of a stator for a rotating electrical machine and a coil terminal.   The connection piece (22) has a U-shape opening toward the terminal (8A, 8B) of the coil (8), and each terminal (19A, 19B) of the bus bar (16U, 16V, 16W, 16N). The terminals (8A, 8B) of the coils (8) along the same circumference (c) enter the connecting piece (22) of the connecting piece (22), and the connecting pieces (22) are inserted into the terminals (8A, 8B). The connecting structure of the bus bar terminal and the coil terminal of the stator for a rotating electrical machine according to claim 1, wherein: A ring-shaped stator core (1), a coil (8) of each tooth (5) of the stator core (1), and a ring shape for supplying power to each of the coils (8) provided on the same axis of the stator core (1) A stator (A) for a rotating electrical machine comprising a bus bar (16U, 16V, 16W) and a neutral point bus bar (16N) connecting the coils (8),
The winding start terminal (8A) and the winding end terminal (8B) of each coil (8), the power feeding terminal (19B) and the neutral point terminal (16B, 16V, 16W, 16N) drawn from each of the ring-shaped bus bars (16U, 16V, 16W, 16N) The stator for a rotating electrical machine, wherein the connection with 19A) is the connection structure according to claim 1 or 2. A winding start terminal (8A) and a winding end terminal (8B) of each coil (8) in the stator for a rotating electrical machine according to claim 3 having the connection structure according to claim 2, and each ring-shaped bus bar (16U). , 16V, 16W, 16N) to connect the power supply terminal (19B) and the neutral point terminal (19A),
Each of the ring-shaped bus bars (16U, 16V, 16W, 16N) is integrated, and the power supply terminal (19B) and the neutral point terminal (19A) are pulled out from the bus bars (16U, 16V, 16W, 16N). Configure unit (3),
The bus bar unit (3) is placed on the side surface of the stator core (1), and with the placement, each winding start terminal (8A) and each winding end terminal (8B) in each connection piece (22). It was placed,
Thereafter, both the pieces (22A, 22B) of the connecting piece (22) are caulked and energized, and the caulking and energizing cause the connecting piece (22) to be connected to each winding start terminal (8A) and each winding end terminal ( 8B) A method for connecting a coil terminal and a bus bar terminal in the stator for a rotating electrical machine to be connected.   A state in which the piece (22A) on the axial center side of the stator (A) of the connection piece (22) faces downward, and the other piece (22B) is opened 90 degrees or more with respect to the one piece (22A). In this state, the bus bar unit (3) is placed on the side surface of the stator core (1), and the bus bar terminal and the coil terminal of the stator for a rotating electrical machine according to claim 4, Connection method.

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