JP6685572B1 - Coil terminal connection method, twist jig, and stator of rotating electric machine - Google Patents

Abstract

For input, which is formed by the slot insertion portion (14b) located in the innermost layer of the slot insertion portions of the coil segment (14) inserted into the slots (4) of the core (6) of the stator (2) The lead wires (14U1, 14U2, 14V1, 14V2, 14W1, 14W2) surround the core (6) with the twist jig (22) together with the slot insertion part (12b) of another coil segment (12) located in the same layer. Bending in the same direction, and thereafter, the joint portion (10), which is a portion for joining the distal end portions of the slot insertion portions (12a) of the adjacent layers, lies in the gap (21) between the rows arranged in the radial direction. Thus, it is bent and led out in the outer peripheral direction, and connected to the terminal members (15U, 15V, 15W), respectively.

Description

  The present invention relates to a stator of a rotary electric machine such as a motor or a generator, a method of connecting terminals of coils in the stator, and a twist jig for implementing the method of connecting terminals.

As a coil of a stator in a rotating electric machine such as a motor or a generator, a plurality of U-shaped coil segments having a pair of linearly extending slot insertion portions are provided in a plurality of slots arranged along the circumferential direction of the stator core. Insert so as to straddle between the slots, twist the ends of these coil segments in the insertion direction protruding from the end face of the stator core, and then weld the ends of the layers adjacent in the radial direction of the stator core. There is known a so-called segment type coil which is electrically joined by.
The U-shaped coil segment is also called a hairpin.

JP, 2009-11116, A

Some of the above-mentioned coil segments serve as lead wires such as input wires and neutral wires, and these protrude from the end surface of the stator core more than ordinary coil segments whose ends are joined together. It is formed as a deformed segment having a large length.
When performing twisting (twisting and bending), insert the tip of a normal coil segment and the tip of a deformed segment located in the same layer as the tip of the normal coil segment into the same twist jig, It is practiced to twist the tip portions in the same circumferential direction and in the opposite direction to the tip portions of the layers adjacent in the radial direction by rotating the twist jig.

In this case, the position of the distal end of the deformed segment after twisting in the circumferential direction of the stator is the same as the position of the joining portion of the distal end of the normal coil segment aligned in the radial direction of the stator core.
With this positional relationship, for example, in the case of electrically connecting a lead wire formed by the tip of the deformed segment located in the innermost end layer of the stator core to the terminal member arranged on the outer side in the radial direction, Is inevitably configured to be connected so as to straddle over the joining portion row at the tip end portion of a normal coil segment.
Although the coil described in Patent Document 1 is not configured to insert a U-shaped coil, the above-described method is adopted to reduce the size by bending the end portion of the coil in the radial direction of the core.

However, as described above, in the connection structure that straddles the upper part of the joint line, it is necessary to increase the length of the drawn-out portion of the odd-shaped segment, which leads to an increase in the material cost of copper or aluminum.
Further, in this type of stator, the smaller the protruding amount of the coil from the end surface of the stator core is, the smaller the contribution of the motor or the like is to the motor, and the influence in millimeter units is exerted. .
Further, if the rising height of the lead wire is large, the rigidity of the connection portion with the terminal member also decreases, so the natural frequency of the lead portion decreases, and for example, the resonance occurs with the vibration accompanying the rotation of the vehicle engine and There is also a concern of causing a disconnection stress.

  The present invention has been devised in view of such a current situation, and in a stator of a rotary electric machine using a coil segment, the cost reduction and the rigidity improvement of the connecting portion between the coil segment and the terminal member are achieved. , It is intended to contribute to downsizing of a rotary electric machine. Another object of the present invention is to make it possible to easily manufacture a stator of a rotary electric machine that has such a low-cost and high-rigidity connection portion and can contribute to downsizing of the rotary electric machine.

  To achieve the above object, the coil terminal connection method according to the present invention has a plurality of slots arranged in the circumferential direction of the core, each of which has a coil segment having a pair of linearly extending slot insertion portions. A plurality of slots are inserted so as to straddle between the slots, and the slot insertion portions inserted in the respective slots form a plurality of layers in the radial direction of the core, and the tip portions of the respective slot insertion portions protruding from the end surface of the core are A method of connecting the terminals of the coil in a stator of a rotating electric machine, which is bent in the circumferential direction and in which a coil is formed by electrically joining the end portions of adjacent layers to each other. A second tip portion located in a layer at one end and having a protruding length from the core end surface that is larger than a first tip portion of the tip portions that are joined together at the tip portions is provided with the tip in the circumferential direction. The terminal member is laid out in a gap between the joints of the parts and led out to the layer side of the other end of the plurality of layers, and the derived second tip end portion is protruded from the layer of the other end. Electrically connect to.

The second tip portion may be bent so as to extend from the inner peripheral side of the core toward the outer peripheral side.
The second tip may be bent in the circumferential direction and then bent in the radial direction at a position corresponding to the gap.
The second tip portion, together with the first tip portion in the same layer as the second tip portion, is bent by one twist jig at a position corresponding to the gap by bending later than the first tip portion in the same layer. Twisting so as to stand up, and then bending the second tip end portion in the radial direction.

  The twist jig according to the present invention includes a pair of linearly extending slot insertion portions, is inserted into a plurality of slots arranged in the circumferential direction of the core so as to straddle the slots, and is inserted into each of the slots. A slot jig is a twist jig for bending the tip end portion of the plurality of coil segments forming a plurality of layers in the radial direction of the core in the circumferential direction, the tip end portion projecting from the end surface of the core, and having a cylindrical or columnar shape. A first housing that houses a body portion and a plurality of first tip portions that are formed in the body portion at intervals in the circumferential direction and that are to be electrically joined to each other in adjacent layers of the tip portions. A recess and a tip portion arranged in the same layer as the first tip portion accommodated in the first accommodating recess, the protrusion length of the core from the end face being larger than that of the first tip portion; House the tip It has a second accommodation recess, and the second accommodation recess is provided in the movable member movable in the circumferential direction with respect to the main body portion.

In a state before the bending is started, it is preferable that a plurality of accommodation recesses including the first accommodation recess and the second accommodation recess are arranged at equal intervals in the circumferential direction.
The main body is rotatable about an axis of the cylinder or the column, and a biasing member for biasing the movable member in the rotation direction of the main body is provided between the main body and the movable member. It is good to have been.
The movable range of the movable member with respect to the main body may be smaller than the arrangement interval of the first accommodating recesses.

A movable range of the movable member with respect to the main body may be ½ of an arrangement interval of the first accommodation recesses.
When the main body is rotatable about the axis of the cylinder or the cylinder, and the main body is rotated in a state where the second tip is inserted into the second storage recess, the second storage recess May move later than the first accommodating recess according to the rotation.

  The stator of the rotating electric machine of the present invention has a plurality of slots arranged in the circumferential direction of the core, and a plurality of coil segments each having a pair of slot insertion portions extending linearly are inserted so as to straddle the slots. The slot insertion portions inserted into the respective slots form a plurality of layers in the radial direction of the core, and the tip portions of the respective slot insertion portions protruding from the end surface of the core are bent in the circumferential direction and are adjacent to each other. A stator of a rotating electric machine in which tip portions between layers are electrically joined to each other, the first tip being located in one layer of the plurality of layers and joining the tip portions of the respective tip portions. A second tip portion, which has a larger projecting length from the end surface of the core than the end portion, is arranged so as to lie in the gap between the joint portions of the tip portions in the circumferential direction, and the other end of the plurality of layers On the layer side of It has been issued.

The second tip portion may be electrically connected to the terminal member at a position projecting in the radial direction from the layer at the other end.
The second tip portion may extend from the inner peripheral side of the core toward the outer peripheral side.
The second tip portion may have a portion bent in the circumferential direction and a portion bent in the radial direction at a position corresponding to the gap.

  ADVANTAGE OF THE INVENTION According to this invention, in the stator of the rotary electric machine using a coil segment, while reducing the cost and rigidity of the connection part between a coil segment and a terminal member, it can contribute to miniaturization of a rotary electric machine. Further, it is possible to easily manufacture such a stator of a rotary electric machine that has a low-cost and high-rigidity connection portion and can contribute to downsizing of the rotary electric machine.

It is a perspective view of the stator of the rotary electric machine which concerns on one Embodiment of this invention. It is a perspective view which shows an example of a coil segment. FIG. 6 is a perspective view showing an example of a modified coil segment. FIG. 3 is a perspective view showing an example of a coil segment different from that shown in FIGS. 2A and 2B. It is a principal part expanded perspective view of FIG. It is a schematic sectional drawing which follows the XX line of FIG. FIG. 3 is a perspective view of a twist jig for carrying out the coil terminal connection method according to the present invention. FIG. 6 is an exploded perspective view of the twist jig shown in FIG. 5. It is a schematic sectional drawing which follows the YY line of FIG. 5, and is a figure which shows the state before a twist jig rotates. FIG. 6 is a schematic cross-sectional view taken along the line YY of FIG. 5, showing a state immediately before the twist of the input lead wire is started by the rotation of the twist jig. It is a principal part perspective view which shows the lead wire for an input at the time of finishing a twist. It is a schematic diagram which shows the process of bending the lead wire for input after twisting, and is a figure which shows the state of the lead wire for input at the time of finishing a twist. FIG. 10B is a view illustrating a state in which the bending is finished, continued from FIG. 10A.

  An embodiment of the present invention will be described below with reference to the drawings.

First, an outline of a configuration of a stator of a rotary electric machine according to an embodiment of the present invention will be described with reference to FIG.
The stator 2 includes a cylindrical core 6 having a plurality of slots 4 arranged in the circumferential direction, and a plurality of U-shaped coil segments (segment conductors) inserted in the slots 4 so as to straddle the slots 4. And a three-phase (U-phase, V-phase, W-phase) coil 8 configured by connecting the coil segments. Reference numeral 5 indicates an insulating sheet for insulating between the core 6 and the coil segment. In the following description, reference numerals including "U" indicate configurations related to the U-phase coil. The same applies to "V" and "W".

Each coil segment is inserted into the slot 4 from the lower side of the core 6 in the drawing, and the tip end portion protruding to the upper side (input side or power feeding side) of the core 6 in the drawing is moved in the circumferential direction of the core 6 by a twist jig described later. Can be folded. Bending (twisting) is performed in the opposite direction for each layer adjacent in the radial direction of the core 6, and after twisting, the tip ends of the coil segments facing each other between the adjacent layers in the radial direction are electrically joined.
Although FIG. 1 shows the state before joining, in the following description, the joining portion 10 has a configuration in which the tip portions face each other (a portion in which the insulating coating formed on the surface of the coil segment has been removed faces each other). Called.

  Incidentally, in the stator 2, slot insertion portions (described later) of six coil segments are inserted into each slot 4. Since all the coil segments have the same thickness, the radial position of each slot insertion part inserted into one slot 4 is common to all the slots. Therefore, it can be considered that the six slot insertion portions into which one slot is inserted form six layers stacked from the outermost peripheral side to the innermost peripheral side, and when referred to as “layer” in this specification, Means the layer of the slot insertion portion unless otherwise specified.

The core 6 has a structure in which thin annular electromagnetic steel plates formed by punching or etching are laminated and integrated in the axial direction of the cylinder. On the inner peripheral side of the core 6, a plurality of teeth (magnetic pole teeth) 7 projecting toward the center are radially formed at predetermined intervals in the circumferential direction. The inner peripheral surface of the core 6 is generally formed by the surface on the tip side of each tooth 7, but the surfaces on the tip side of each tooth 7 are separated from each other (in order to make it easier to see the reference numerals near the center of FIG. Part of the tooth is white, but even in the filled part, the teeth 7 are separated from each other). Further, the slot 4 is formed between the adjacent teeth 7.
The number of poles (the number of magnetic poles) of a rotor (not shown) inserted in the stator 2 of the present embodiment is 8, and the number of slots per phase of the coil 8 of three phases with respect to the number of poles is 2. Therefore, a total of 48 slots 4 are arranged in the core 6.

  As shown in FIGS. 2A to 2C, each coil segment is formed by bending a rectangular wire whose surface is covered with an insulating film into a U shape by bending. Explaining in detail with reference to FIG. 2A, each coil segment 12 is composed of a pair of linearly extending slot insertion portions 12a and 12b and a coupling portion 12c that connects these, and one slot insertion portion 12a and the other slot insertion portion 12a. The connecting portion 12c has a step shape so that the slot inserting portions 12b can be arranged in different layers. Then, the insulating coating is removed from the portions (tip portions) of the predetermined lengths at the tips of the slot insertion portions 12a and 12b, and it is possible to electrically connect to the slot insertion portions of other coil segments, connection terminals, and the like. Is.

  The coil segment of the present embodiment includes a normal coil segment 12 (FIG. 2A) having a tip portion (first tip portion) connected to another coil segment at the joint portion 10, and a core 6 rather than the coil segment 12. The coil segment 14 (FIG. 2B) having a large protrusion length from the end face of the coil segment and the coil segment 16 (FIG. 2C) having the tip part serving as the neutral wire are included.

The deformed coil segment 14 shown in FIG. 2B is composed of a pair of linearly extending slot insertion portions 14a and 14b and a connecting portion 14c that connects them, and the connecting portion 14c has a step shape (crank shape). There is.
One slot insertion portion 14b of the deformed coil segment 14 is longer than the other slot insertion portion 14a, and its tip (second tip) serves as an input lead wire. The slot insertion portion 14a has substantially the same projecting length from the end surface of the core 6 as the slot insertion portions 12a and 12b of the coil segment 12, and the tip end portion thereof has the slot insertion portion 12b of either coil segment 12. Is joined to the tip of the.

  The pair of slot insertion portions 12a and 12b of the normal coil segment 12 have the same length, and the coil segment 16 having the tip end portion which is a neutral wire is connected to the pair of slot insertion portions 16b and 16c by the coupling portion 16c. Among them, the length of one slot insertion portion 16b is slightly longer than the length of the other slot insertion portion 16a. The length difference n between the slot insertion portions of the coil segment 16 is smaller than the length difference m between the slot insertion portions of the deformed coil segment 14.

  Strictly speaking, the slot insertion portions 12a and 12b of the normal coil segment 12 also correspond to different circumferential lengths between the slots 4 depending on the radial position of the core 6, and thus the slot insertion for each layer. The protruding length of the insertion portion from the end surface of the core 6 is slightly different. However, here, these differences in length are not included in the concept of "heteromorphic segment". The coil segment 16 is also not included in the concept of “an odd-shaped segment”.

  As described above, the six slot insertion portions are inserted into each slot 4 so as to be aligned in a row in the radial direction of the core 6. Then, the plurality of coil segments are connected in series by electrically connecting the tip portions of the pair of slot insertion portions that face each other in the joint portion 10, so that the positions where the core 6 makes approximately six turns are arranged in the circumferential direction. It is possible to form two coils displaced from each other for each phase. In the example of FIG. 1, two coils of the same phase are further connected in parallel to form each phase coil. Each coil that makes about six turns around the core 6 has a structure in which it is routed from the innermost layer to the outermost layer and returns to the innermost layer, and both ends are formed into the innermost layer. To position.

  As shown in FIG. 1, in the innermost layer of the core 6, input lead wires 14U1, 14U2, 14V1, 14V2, 14W1, which are formed by bending the longer slot insertion portion 14b of the deformed coil segment 14, are formed. 14W2 is arranged. The ends of these lead lines are electrically connected to, for example, terminal members 15U, 15V, 15W connected to the AC output section of the inverter. The input lead wires 14U1 to 14W2 denoted by reference numerals in FIG. 1 are respectively located at one end of each coil, and, for example, the terminal member 15U also plays a role of connecting two U-phase coils in parallel. The same applies to the V phase and the W phase.

  Further, neutral wires 16U1, 16U2, 16V1, 16V2, 16W1, 16W2 formed by the longer slot insertion portion 16b of the coil segment 16 are also arranged in the same layer as the input lead wires 14U1 to 14W2, These are electrically connected to a long plate-shaped common conductor (not shown) as a neutral point. The neutral wires 16U1 to 16W2 are located at the other end of each coil.

As shown in FIG. 3, the input lead wires 14U1, 14U2, 14V1 and 14V2 are provided in the circumferential direction of the core 6 between the joint portions 10 formed between the tip ends of the other coil segments 12 (in the radial direction). It is arranged so as to lie in (between the rows of the joined portions 10). The same applies to the input lead lines 14W1 and 14W2 that do not appear in FIG. 3 (appear in FIG. 1).
That is, from the end face of the core 6 rather than the slot insertion parts 12a, 12b, etc., which are located in the innermost layer that is one end side in the radial direction and have the tip parts (first tip parts) joined by the joining part 10. The distal end portion (second distal end portion) of the slot insertion portion 14b having a large protruding length of the slot insertion portion is arranged so as to lie in the gap 21 between the joint portions 10, and the other end side in the radial direction (outermost peripheral side). ) Has been derived.

More specifically, the input lead wires 14U1, 14U2, 14V1 and 14V2 have the slot insertion portions 14b of the irregular coil segments 14 and the slot insertion portions of the normal coil segment 12 in the same layer in the same circumferential direction. The bent portion 14b-1 formed by bending (twisting), the lead-out portion 14b-2 extending from the inner peripheral side toward the outer peripheral side in the gap 21 between the rows of the joint portions 10, and the outermost layer The core 6 has a rising portion 14b-3 rising in the axial direction of the core 6 from the tip of the lead-out portion 14b-2 at a position protruding outward in the radial direction, and the rising portion 14b-3 is connected to the terminal members 15U and 15V. Has been done.
The lead-out portion 14b-2 is a portion that is bent in the radial direction at a position corresponding to the gap 21. The input lead lines 14W1 and 14W2 shown in FIG. 1 have the same configuration.

By adopting the terminal connection method (terminal connection configuration) using the input lead wire and the terminal member as described above, the input lead wire 14U1 can be connected to the terminal member 15U by a shortcut as shown in FIG. . The same applies to the other input lead lines.
Thereby, the material cost of the coil segment can be reduced as compared with the configuration in which the input lead wire is raised to the position of the innermost layer and the terminal member is connected to the input lead wire across the upper part of the row of the joint portions 10. The height can be reduced and the height from the end surface of the core 6 in the axial direction of the core 6 of the lead-out portion 14b-2 for the input lead wire can be reduced, which greatly contributes to downsizing of the stator 2.

  In the configuration of FIG. 4, the rising length of the rising portion 14b-3 is relatively long, but in the terminal connection configuration described here, even if the rising length is shorter, the rising portion 14b-3 itself is also longer. It is possible to connect the coil and the terminal member without the provision of. With this configuration, the effect of reducing the material cost of the coil segment and the size reduction of the stator 2 can be further enhanced.

  Further, in the configuration of FIG. 4, since the height of the lead-out portion 14b-2 of the input lead wire in the axial direction of the core 6 can be reduced, the rigidity of the connection portion between the input lead wire and the terminal member can be increased. As a result, the natural frequency of the input lead wire can be increased. That is, when the rigidity of the connecting portion is low, the natural frequency of the input lead wire decreases, but this decrease can be suppressed. By increasing the natural frequency in this way, it is possible to reduce the risk of causing disconnection stress in the connection portion by resonating with the vibration associated with the rotation of the vehicle engine.

Next, with reference to FIG. 5 to FIG. 8, a twist jig for efficiently carrying out the above terminal connecting method will be described.
The twist jigs 22 shown in FIGS. 5 to 8 are inserted into the slots 4 of the core 6 shown in FIG. 1 and project from the end face of the core 6, and the coil segments 12, 14 in the innermost layer, This is a tool for bending the distal end portion of the slot insertion portion of 16 in the insertion direction in the circumferential direction of the core 6.

  The core 6 is fixed, and the main body 24 of the twist jig 22 is rotated in a state in which the distal end portions of the respective slot insertion portions are respectively accommodated in the first accommodation concave portion 26 and the second accommodation concave portion 28, which will be described later. Of the slot insertion portion projecting from the end face of 6, the range not accommodated in the first accommodating recess 26 or the second accommodating recess 28 (portion near the end face of the core 6) can be twisted in the rotation direction.

  As shown in FIGS. 5 and 6, the twist jig 22 has a cylindrical main body 24 having a connecting portion for connecting to a drive mechanism (not shown). The drive mechanism rotationally drives the main body 24 about its central axis. A plurality of first accommodating recesses 26 and second accommodating recesses 28 are formed in the main body 24 at intervals in the circumferential direction. In addition, in a state before the main body portion 24 is rotated for twisting (a state in which each movable member 32U, 32V, 32W is in an initial position described later), each accommodation including the first accommodation concave portion 26 and the second accommodation concave portion 28 is performed. The recesses are arranged at equal intervals.

  The first accommodating recess 26 basically constitutes the joint portion 10 of the coil segments 12, 14, 16 and accommodates the tip portions of the pair of slot insertion portions to be electrically joined to each other. The part of the first accommodating recesses 26 accommodates the distal end portion of the slot insertion portion of the coil segment 16 that is a neutral wire. The second accommodating recess 28 accommodates the distal end portion of the slot insertion portion 14b of the deformed coil segment 14 that serves as the input lead wires 14U1, 14U2, 14V1, 14V2, 14W1, 14W2.

  It should be noted that the respective tip portions accommodated in the first accommodating recessed portions 26 are approximately the core 6 in FIG. 1 from the tip ends of the slot insertion portions of the coil segments 12, 14, 16 (slot insertion portions 14a in the coil segment 14). It is the range up to the part that rises along the axis of. Each tip end accommodated in the second accommodating recess 28 is in a range from the tip end of the slot insertion portion 14b of each coil segment 14 to a portion that substantially constitutes the lead-out portion 14b-2 and the rising portion 14b-3 in FIG. .

An insertion hole 24a into which the drive shaft of the drive mechanism is inserted is formed on the upper surface of the main body 24.
Three concave portions 30U, 30V, 30W are formed on the side surface of the main body portion 24 at intervals in the circumferential direction. Block-shaped movable members 32U, 32V, 32W are provided in the recesses 30U, 30V, 30W so as to be slidable in the circumferential direction with respect to the main body 24. Two second housing recesses 28 are formed on the outer surface of each of the movable members 32U, 32V, 32W at intervals in the circumferential direction.
In this configuration, the slot insertion portions 14b, which are the input lead wires 14U1, 14U2, 14V1, 14V2, 14W1, 14W2, are provided in two sets at positions close to each other for the U phase, the V phase, and the W phase. Corresponding to the above, the two sets of each phase are to be housed in the second housing recesses 28 provided in the respective one movable member 32U, 32V, 32W.

Two guide protrusions 31 extending in the circumferential direction at intervals in the axial direction of the main body 24 are formed in each of the recesses 30U, 30V, 30W, and correspondingly, the movable members 32U, 32V, A fitting recess 32a (see FIG. 6) that fits into each guide projection 31 is formed on the inner peripheral side of 32W.
Each guide convex portion 31 is fixed to the main body portion 24 with a fixing screw (not shown) inserted through the screw hole 31a (see FIG. 6).

In addition, in order to prevent the movable members 32U, 32V, 32W from falling off to the outside, a band plate 34 extending in the circumferential direction is fixed to the main body portion 24 so as to be flush with the outer surface of the main body portion 24. It is fixed at 36 (see FIGS. 7 and 8). An annular groove 24b is formed on the outer surface of the body portion 24, and a screw hole 24c (FIG. 6) into which a fixing screw 36 is screwed is formed in the annular groove 24b. The band plate 34 is fitted into the annular groove 24b and is fixed by fixing screws 36 at four positions in the circumferential direction. Reference numeral 34a indicates an insertion hole for the fixing screw 36.
On the outer surface side of each of the movable members 32U, 32V, 32W, a fitting recess 32b (see FIG. 6) that fits into the band plate 34 is formed. As a result, the movable members 32U, 32V, 32W can be stably slid in the circumferential direction of the main body 24 while being supported inside and outside.

  As shown in FIG. 6, between the movable members 32U, 32V, 32W and the main body 24, the movable members 32U, 32V, 32W are attached in the rotation direction (arrow R direction) when the main body 24 is twisted. A coil spring 38, which is a biasing member for biasing, is provided. In the present embodiment, the coil springs 38 are installed at upper and lower two locations, but the number of installation locations is not limited to this. Further, the biasing member may be configured by using another elastic member instead of the coil spring. This biasing member removes the tip end of the coil segment from the twist jig 22 after twisting, and then sets the movable members 32U, 32V, 32W at the initial position (the front end face 30a of the concave portions 30U, 30V, 30W in the rotation direction). The position for contacting with the contact point) is required, and any function may be provided.

As shown in FIGS. 7 and 8, one end of the coil spring 38 is accommodated in a spring accommodating hole 32c, which is a spring seat formed in each of the movable members 32U, 32V, 32W, and the other end thereof is in each recess 30U, The configuration is such that it only abuts on the end face 30b on the rear side in the rotational direction of 30V and 30W.
7 and 8, the guide protrusions 31 of the recesses 30U, 30V, 30W are not shown.

The spring constant of the coil spring 38 is the same as that of the main body portion 24 when the twist jig 22 rotates with the ends of the coil segments 12, 14, 16 inserted into the first accommodation recess 26 and the second accommodation recess 28, respectively. The size of each movable member 32U, 32V, 32W does not move.
As a result, even if the main body portion 24 starts the rotation operation, in the initial stage thereof, the slot insertion for the input lead-out wires 14U1, 14U2, 14V1, 14V2, 14W1, 14W2 accommodated in the second accommodation recess 28 is performed. The twisting of the portion 14b does not start, the main body portion 24 rotates by a certain angle to reach the end of the movable range, and the movable members 32U, 32V, 32W come into contact with the end faces 30b of the recessed portions 30U, 30V, 30W in the rotational direction. You can start the twist afterwards.

That is, the second accommodating recess 28 moves in the circumferential direction later than the first accommodating recess 26 when the main body 24 rotates with the tip of the slot insertion portion 14b inserted in the second accommodating recess 28. It will be.
The dimension t (the length of the movable range of the second accommodating recess 28) corresponding to the delay of the second accommodating recess 28 with respect to the first accommodating recess 26 shown in FIG. 7 is the tip portion of the coil segment 12 in the first accommodating recess 26. Is 1/2 of the accommodation pitch P in the circumferential direction. The accommodation pitch P is a formation pitch of the first accommodation recesses 26, and is also an interval between the joint portions 10 in the stator 2.

  As a result, when the body portion 24 of the twist jig 22 starts to rotate, the twist of the slot insertion portion, the tip portion of which is accommodated in each first accommodation recess 26, is started at the same time as the rotation. However, twisting is not started at this point in the slot insertion portion 14b, which is the input lead wires 14U1, 14U2, 14V1, 14V2, 14W1, and 14W2, the leading end portion of which is accommodated in the second accommodation recess 28. This is because even if the main body portion 24 rotates, the respective movable members 32U, 32V, 32W only slide with it, and the absolute position of the second accommodation recess 28 does not change.

As shown in FIG. 8, since the coil spring 38 is compressed and the movable members 32U, 32V, 32W come into contact with the end faces 30b of the recesses 30U, 30V, 30W at the rear side in the rotation direction, the input lead wires 14U1, 14U2. , 14V1, 14V2, 14W1, 14W2, the twisting of the slot insertion portion 14b starts.
As a result, as shown in FIG. 9, when the body portion 24 is rotated by a predetermined angle and the slot insertion portions of the coil segments 12, 14, 16 are twisted, the input lead wires 14U1, 14U2, 14V1, 14V2, The slot insertion portions 14b, which are 14W1 and 14W2, are located at the circumferential positions corresponding to the gaps 21 between the rows of the joint portions 10 arranged in the radial direction of the core 6, and the portions accommodated in the second accommodation recesses 28 are The core 6 is in a state of standing vertically to the end surface of the core 6.

  Since the width of the gap 21 in the circumferential direction is larger than the width of the slot insertion portion 14b in the circumferential direction, the condition that the dimension t is 1/2 of the accommodation pitch P does not have to be strict. That is, when the twist jig 22 is rotated by a predetermined angle, the slot insertion portion 14b, which becomes the input lead wires 14U1, 14U2, 14V1, 14V2, 14W1, 14W2, in the gap 21 interferes with the secondary bending process described later. It suffices to set the dimension t so as to stand up at a non-existing position. However, it is preferable that t is sufficiently smaller than P so that the second accommodation recess 28 and the first accommodation recess 26 do not interfere with each other even at the end of the movable range of the second accommodation recess 28.

After twisting, connect the terminal insertion members 15U, 15V, 15W shown in FIG. 1 to the slot insertion portion 14b to be the input lead wires 14U1, 14U2, 14V1, 14V2, 14W1, 14W2 in a vertically standing state. Secondary bending is performed to achieve this.
Taking the input lead wire 14U1 as an example, the secondary bending process is performed in the following procedure.
First, as shown in FIG. 10A, the bending guide member 40 that guides the bending of the root of the input lead wire 14U1 is inserted from the outside in the radial direction of the core 6, and in this state, the tip portion of the input lead wire 14U1 is It is accommodated in the bending member 42 of the processing device.

The processing device obliquely moves the bending member 42 as shown by an arrow Q in FIG. 10B, so that the slot insertion portion 14b serving as the input lead wire 14U1 is bent to lie in the gap 21 and is led out. -2 is formed. After that, the tip end portion is further bent by the bending member 42 in the axial direction of the core 6 to form the rising portion 14b-3.
The same applies to the other input lead lines 14U2, 14V1, 14V2, 14W1 and 14W2.

  In the above description, the twisting of the coil segment of the innermost layer by the twist jig 22 has been described. However, for each of the other layers, the twist jig corresponding to each layer is used from the end surface of the core 6 of the coil segment. Twist the protruding part. Since there is no coil segment that serves as an input lead wire in the other layer, only the first accommodating recesses 26 need to be provided at equal intervals in the twist jig corresponding to the other layer. Also, the recess 30 and the movable member 32 for providing it are unnecessary. The twist direction of each layer is opposite to that of the adjacent layer. Further, the twisting may be performed in two layers by using two twist jigs.

In the above-described embodiment, the first accommodating recess 26 and the second accommodating recess 28 are formed in the shape of vertical grooves extending in the axial direction of the core 6, but the inner peripheral surfaces of the main body 24 and the movable members 32U, 32V, 32W. Alternatively, it may be formed inside, or may be formed inside the side surface of the main body 24 or inside each of the movable members 32U, 32V, 32W as a hole not exposed to the side surface.
Further, the main body portion 24 may have a cylindrical shape instead of the cylindrical shape.

  Further, in the above-described embodiment, an example in which the lead wire for input is laid out in the gap 21 between the joint portions 10 in the circumferential direction of the normal coil segment and the lead wire is led from the inner circumference side to the outer circumference side has been shown. The invention is not limited to this, and may be configured to lead from the outer peripheral side to the inner peripheral side. Further, the object to be laid in the gap 21 is not limited to the input lead line.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this particular embodiment, and various modifications and changes are possible. The above-described configuration of the present invention can be implemented by taking out only a part thereof, and the modifications described in the above description can be applied in an arbitrary combination as long as they do not contradict each other. The effects described in the embodiments of the present invention merely exemplify the most preferable effects that result from the present invention, and the effects according to the present invention are not limited to those described in the embodiments of the present invention. .

2 Stator of a rotary electric machine 4 Slot 6 Core 10 Joint part 12,16 Coil segment 14 Deformed coil segment 12a, 12b, 14a, 14b, 16a, 16b Slot insertion part 21 Gap 22 Twist jig 24 Main body part 26 1st accommodation recess 28 2nd accommodation recessed part 32U, 32V, 32W movable member 38 coil spring

Claims (14)

A plurality of coil segments each having a pair of linearly extending slot insertion portions are inserted into a plurality of slots arranged in the circumferential direction of the core so as to straddle between the slots, and the slot insertion inserted into each of the slots. Part forms a plurality of layers in the radial direction of the core, the tip part of each slot insertion part protruding from the end face of the core is bent in the circumferential direction, and the tip parts of adjacent layers are electrically connected to each other. In a stator of a rotating electric machine in which a coil is formed by being joined, a method of connecting terminals of the coil,
The second tip portion located at one layer of the plurality of layers and having a protrusion length from the core end surface larger than that of the first tip portion of the tip portions joined at the tip portions is provided with the second tip portion. In the gap between the joining portions of the tip portions in the direction, and is led out to the layer side of the other end of the plurality of layers, and the derived second tip portion is projected from the layer of the other end. A method for connecting terminals of a coil, comprising electrically connecting to a terminal member at a position. The method of connecting terminals of a coil according to claim 1, wherein
The method for connecting terminals of a coil, wherein the second tip portion is bent so as to extend from an inner peripheral side of the core toward an outer peripheral side thereof. The method of connecting terminals of a coil according to claim 2, wherein
A method for connecting terminals of a coil, comprising bending the second tip portion in the circumferential direction and then bending the second tip portion in the radial direction at a position corresponding to the gap. The method of connecting terminals of a coil according to claim 3,
The second tip portion, together with the first tip portion in the same layer as the second tip portion, is bent by one twist jig at a position corresponding to the gap by bending later than the first tip portion in the same layer. A method for connecting terminals of a coil, characterized by twisting to stand up and then bending the second tip in the radial direction. Each of the cores is provided with a pair of linearly extending slot insertion portions, is inserted into a plurality of slots arranged in the circumferential direction of the core so as to straddle the slots, and the slot insertion portions inserted in the respective slots are A plurality of coil segments forming a plurality of layers in the radial direction, a twist jig for bending the tip portion protruding from the end surface of the core in the circumferential direction,
A cylindrical or cylindrical main body,
A plurality of first accommodating recesses that are formed in the main body portion at intervals in the circumferential direction and accommodate first extremities of adjacent layers of the extremities that are to be electrically connected to each other;
A second tip portion that is arranged in the same layer as the first tip portion that is accommodated in the first accommodating recess and that has a protrusion length from the end surface of the core that is larger than that of the first tip portion. A second accommodating recess for accommodating,
The twist jig, wherein the second accommodating recess is provided in a movable member that is movable in the circumferential direction with respect to the main body. The twist jig according to claim 5,
In a state before starting the bending, the twist jig is characterized in that a plurality of housing recesses including the first housing recess and the second housing recess are arranged at equal intervals in the circumferential direction. The twist jig according to claim 6,
The main body is rotatable about the axis of the cylinder or the cylinder,
A twisting jig, characterized in that an urging member for urging the movable member in the rotation direction of the main body is provided between the main body and the movable member. The twist jig according to any one of claims 5 to 7,
A twist jig, wherein a movable range of the movable member with respect to the main body is smaller than an arrangement interval of the first accommodation recesses. The twist jig according to claim 8, wherein:
A twist jig, wherein a movable range of the movable member with respect to the main body portion is ½ of an arrangement interval of the first accommodation recesses. The twist jig according to any one of claims 5 to 9,
The main body is rotatable about the axis of the cylinder or the cylinder,
When the main body portion is rotated in a state where the second tip portion is inserted into the second accommodation recess, the second accommodation recess moves later than the first accommodation recess in response to the rotation. And twist jig. A plurality of coil segments each having a pair of linearly extending slot insertion portions are inserted into a plurality of slots arranged in the circumferential direction of the core so as to straddle between the slots, and the slot insertion inserted into each of the slots. Part forms a plurality of layers in the radial direction of the core, the tip part of each slot insertion part projecting from the end face of the core is bent in the circumferential direction, and the tip parts between adjacent layers are electrically connected to each other. A stator of a rotating electric machine that is joined,
A second tip portion located on one layer of the plurality of layers and having a protrusion length from the end surface of the core larger than that of the first tip portion of the tip portions joined to each other by the tip portions; A stator of a rotating electric machine, wherein the stator is arranged so as to lie in a gap between the joints of the tip portions in the circumferential direction and is led out to the layer side of the other end of the plurality of layers. The stator of the rotary electric machine according to claim 11,
The stator of a rotating electric machine, wherein the second tip portion is electrically connected to the terminal member at a position protruding from the layer at the other end in the radial direction. The stator of the rotary electric machine according to claim 11 or 12,
The stator of a rotating electric machine, wherein the second tip portion extends from an inner peripheral side of the core toward an outer peripheral side thereof. The stator of the rotary electric machine according to any one of claims 11 to 13,
The stator of a rotary electric machine, wherein the second tip portion has a portion bent in the circumferential direction and a portion bent in the radial direction at a position corresponding to the gap.

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