JP4816356B2 - Conductor twisting device - Google Patents

Description

  The present invention relates to a conductor twisting device that chucks and holds a plurality of conductors arranged in a multilayer ring shape.

2. Description of the Related Art Conventionally, a stator coil twisting device that performs coil forming by inserting a U-shaped conductor into a plurality of slots formed in an annular stator core and twisting a conductor protruding from an axial end face on the opposite side in the circumferential direction is known. (For example, refer to Patent Document 1). In this stator coil twisting device, a plurality of twisting jigs and a plurality of twisting jigs that rotate separately are twisted to twist a plurality of (four along the radial direction) conductors protruding from the axial end surface of the stator core. It is equipped with a rotational drive mechanism.
Japanese Patent No. 319638 (page 4-7, FIG. 1-8)

  By the way, in the stator coil twisting device disclosed in Patent Document 1, in order to twist the conductor protruding from the axial end surface of the stator core in the circumferential direction, the number of twisting jigs and rotations corresponding to the number of conductors arranged along the radial direction are rotated. Since a drive mechanism is required, there is a problem that the configuration becomes complicated when the number of conductors increases. For example, in the case of a stator in which eight or more conductors are arranged in the radial direction, the number of twisting jigs and rotational drive mechanisms is also eight or more.

  The present invention has been created in view of such a point, and an object of the present invention is to provide a conductor twisting device that can twist a plurality of multilayered conductors in the circumferential direction with a simple configuration.

  In order to solve the above-described problem, the conductor twisting device of the present invention twists a plurality of electric conductors protruding in the axial direction from the end face of the annular stator core and arranged in the radial direction in the circumferential direction. A plurality of ring-shaped holding parts having a cylindrical shape for holding the tip of the ring and a part of the plurality of ring-shaped holding parts directly or indirectly through a connecting part. The first rotation drive mechanism that rotates in the direction and the remainder of the plurality of ring-shaped holding portions are connected directly or indirectly via a connecting portion, and the remaining ring-shaped holding portions are rotated by the first rotation driving mechanism. A second rotation drive mechanism that rotates in the direction opposite to the direction. Since a plurality of (for example, eight) electric conductors arranged along the radial direction can be twisted in the circumferential direction using the first and second rotary drive mechanisms, the number of electric conductors arranged along the radial direction The configuration can be simplified as compared with the case where the same number of rotational drive units are provided.

In addition, the first rotation drive mechanism described above includes a first rotation drive ring group that is separately connected to each of the ring-shaped holding portions via a connection portion and is rotatable, and a first rotation drive ring. A second rotation drive mechanism that rotates the group at the same time, and the second rotation drive mechanism is connected to each of the remaining ring-shaped holding portions separately via a connection portion and is rotatable. A drive ring group and a second rotational drive unit that simultaneously rotationally drives the second rotational drive ring group are provided. By providing the first and second rotary drive ring groups separately from the ring-shaped holding portion, it becomes easy to make these sizes and shapes suitable for rotational drive.

The first rotational drive unit described above includes a first drive lever coupled to the first rotational drive ring group, and the second rotational drive unit is coupled to the second rotational drive ring group. A second drive lever is provided, and the first and second drive levers are rotated in opposite directions using a common drive source (for example, a ball screw) . Thereby, the number of motors for rotating the ball screw can be reduced, and the configuration can be further simplified.

  In addition, a part of the ring-shaped holding portions that are rotated in one direction by the first rotation driving mechanism and the other ring-shaped holding portions that are rotated in the opposite direction by the second rotation driving mechanism are along the radial direction. It is desirable that they are arranged alternately. As a result, the electric conductors arranged in a row in the radial direction in the slots of the stator core can be regularly twisted to the opposite sides in the circumferential direction.

  Hereinafter, a conductor twisting apparatus according to an embodiment to which the present invention is applied will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view in the axial direction of a motor as a rotating electrical machine of one embodiment used for generating compressor power of a vehicle air conditioner. FIG. 2 is a perspective view of a segment forming a part of the stator coil. FIG. 3 is a partial cross-sectional view showing a state in which segments are accommodated in slots provided in the stator core.

  As shown in FIG. 1, the motor 100 of this embodiment includes a stator core (stator core) 1, a rotor 2, a stator coil (stator winding) 3, a housing 4, and a rotating shaft 7. The stator core 1 is fixed to the inner peripheral surface of the peripheral wall of the housing 4. The stator coil 3 is wound around each slot of the stator core 1. The rotor 2 is an IPM type rotor that is fixed to a rotating shaft 7 that is rotatably supported by the housing 4, and is disposed on the inner diameter side of the stator core 1. The stator coil 3 is a three-phase armature winding and is fed by a three-phase inverter connected to an external battery.

  The motor 100 is a permanent magnet type three-phase brushless DC motor (synchronous motor) that generates compressor power for a vehicle air conditioner of a secondary battery vehicle, a fuel cell vehicle, or a hybrid vehicle. Can be replaced with a format. Since such various types of synchronous machines are well known, a detailed description of the operation principle is omitted.

  The stator coil 3 is inserted into the slots 33 of the stator core 1 from one end face side of the stator core 1 through segments 33 as electric conductors having a predetermined shape (U-shape) shown in FIG. Is projected to the other end face side of the stator core 1 by a necessary length, and the protruding end portions of the segments 33 are respectively twisted by π / 2 in the circumferential direction at an electrical angle of approximately, and the tip end portions of the protruding end portions of the segments 33 ( The joint portion) is welded in a predetermined combination. The segment 33 has a long plate U shape that is covered with a resin film (insulating film) except for a welded portion, that is, a tip end portion of the protruding end portion (also referred to as an end tip portion).

  As shown in FIG. 1, in the stator coil 3 of the present embodiment, each of the segment set S1 arranged on the inner peripheral side and the segment set S2 arranged on the outer peripheral side has the large and small segments 33 shown in FIG. It has a combined structure (FIG. 3).

  Next, details of the segment set S1 composed of two segments 33 (the same applies to the segment set S2) will be described in more detail. The segment set S1 includes a head portion as a substantially U-shaped turn portion, a pair of slot conductor portions that extend linearly from both ends of the head portion and are accommodated in slots, and from the tip ends of both slot conductor portions. It consists of two segments 33 each having a pair of extending end portions that extend. Of these two segments 33, the smaller one is called a small segment 332, and the larger one surrounding the small segment 332 is called a large segment 331. In the state before being inserted into each slot 35 of the stator core 1, the protruding end portion twisted in the circumferential direction is not formed, and the portion corresponding to the slot conductor portion and the protruding end portion forms a straight portion. ing.

  The stator coil 3 includes a first coil end portion (head-side coil end portion) 31 that exists in a ring shape as a whole on one end face side of the stator core 1 and a ring shape as a whole on the other end face side of the stator core 1. It is divided into a second coil end portion (end side coil end portion) 32 that exists and a slot conductor portion that exists in the slot. That is, in FIG. 1, the head-side coil end 31 is constituted by the head portion of each segment 33, and the end-side coil end 32 is constituted by the protruding end portion of each segment 33.

  The large segment 331 has slot conductor portions 331a and 331b, a head portion 331c, and protruding end portions 331f and 331g. Since the tip end portions 331d and 331e of the protruding end portions 331f and 331g are joint portions, they are also referred to as end tip portions or joint portions.

  The small segment 332 includes slot conductor portions 332a and 332b, a head portion 332c, and protruding end portions 332f and 332g. Since the leading end portions 332d and 332e of the protruding end portions 332f and 332g are joint portions, they are also referred to as end tip portions or joint portions.

  The symbol “′” indicates the same portion as the portion without the symbol “′” of the large segment 331 or the small segment 332 (not shown). Accordingly, in FIG. 2, the joint portion 332 d and the joint portion 331 d ′ that are adjacent to each other in the radial direction are welded, and the joint portion 332 e and the joint portion 331 e ′ that are adjacent to each other in the radial direction are welded.

  In FIG. 2, when the innermost slot conductor 331a and the innermost slot conductor 332a are accommodated in one slot 35 of the stator core 1, the outermost slot conductor 331b of the same large segment 331 and small segment 332 is provided. The slot conductor portion 332b in the middle and outer layers is accommodated in another slot 35 that is a predetermined odd-numbered magnetic pole pitch T (for example, one magnetic pole pitch (electrical angle π)) from this one slot 35. The head 332c of the small segment 332 is disposed so as to be surrounded by the head 331c of the large segment 331.

  The arrangement state of the segments in each slot 35 of the stator core 1 will be described with reference to FIG. In each slot 35, eight conductor housing positions P1 to P8 are set along the radial direction, and one slot conductor portion is housed in each conductor housing position P1 to P8. Each slot 35 sequentially accommodates the two segment sets S1 and S2 described above in the radial direction, the conductor accommodating positions P1 to P4 accommodate the segment set S1, and the conductor accommodating positions P5 to P8 accommodate the segment set S2. .

  The inner segment set S1 will be described in detail as an example. The innermost slot conductor portion 331a is disposed on the radially innermost side of the slot 35 of the stator core 1, and hereinafter, the innermost slot conductor portion 332a, The slot conductor portions 332b ′ in the middle and outer layers are arranged in this order in the order of the slot conductor portion 331b ′ in the outermost layer. As a result, each slot 35 accommodates four slot conductor portions in the four layers and one row with respect to the segment set S1. In FIG. 3, the slot conductor portions 331 b ′ and 332 b ′ belong to a large segment 331 and a small segment 332 that are different from the large segment 331 and the small segment 332 having the slot conductor portions 332 a and 331 a. The segment set S2 has the same arrangement as described above. FIG. 4 is a diagram illustrating a state in which the segment set S1 including the large segment 331 and the small segment 332 is inserted into the slot 35.

  By the way, the protruding end portions 331f, 331g, 332f, and 332g included in the two segment sets S1 and S2 described above are simultaneously formed using a conductor twisting device. FIG. 5 is a partial cross-sectional view of the conductor twisting device. The conductor twisting device 200 of the present embodiment shown in FIG. 5 includes a coil pressing portion 210, eight ring-shaped holding portions 211 to 218, and workpiece fixing portions 220 and 222.

  The coil holding portion 210 is disposed outside when the protruding end portions 331f, 332f, 332g, and 331g are twisted to the opposite sides in the circumferential direction with the segment sets S1 and S2 inserted into the slots 35 of the stator core 1. This is for limiting the axial movement of the head 331c of the large segment 331. The workpiece fixing parts 220 and 222 are fixed so that the stator core 1 does not move during twisting.

  The eight ring-shaped holding portions 211 to 218 have a cylindrical shape, and when the segment sets S1 and S2 are inserted into the slots 35 of the stator core 1, protruding end portions 331f, 332f, 332g, and 331g before twisting. Hold the tip of. These ring-shaped holding portions 211 to 218 also serve as pressing portions that press the protruding end portions in the axial direction.

  FIG. 6 is a partial plan view of the ring-shaped holding portions 211 to 218, showing the shape of the side facing the protruding end. The ring-shaped holding portions 211 to 218 are arranged concentrically, and are rotationally driven alternately in opposite directions in the circumferential direction by a rotation driving mechanism (described later). Further, as shown in FIG. 6, insertion portions 211 a to 218 a are provided on the respective front end surfaces of the ring-shaped holding portions 211 to 218 as concave portions in which the leading ends of the protruding end portions before being twisted are inserted and held. ing. These eight insertion portions 211a to 218a are arranged in a row in the radial direction before the protruding end portion is twisted, and adjacent ones form a pair to form one recess (a total of four recesses). Is forming.

  Specifically, the insertion portion 211a formed in the ring-shaped holding portion 211 holds the end portion of one protruding end portion 331f of the large segment 331 of the segment set S1, and the insertion portion formed in the ring-shaped holding portion 212. 212a holds the end of one protruding end 332f of the small segment 332 of the segment set S1. These two protruding end portions 331f and 332f are joined to each other after the twist forming, and the two insertion portions 211a and 212a corresponding to these form one concave portion as a whole. Further, the insertion portion 213a formed in the ring-shaped holding portion 213 holds the end of the other protruding end portion 332g of the small segment 332 of the segment set S1, and the insertion portion 214a formed in the ring-shaped holding portion 214 is a segment. The other protruding end portion 331g of the large segment 331 of the set S1 is held. The two protruding end portions 332g and 331g are joined to each other after the twist forming, and the two insertion portions 213a and 214a corresponding to the two protruding end portions 213a and 214a form one concave portion as a whole. Similarly, the insertion portion 215a formed in the ring-shaped holding portion 215 holds the end portion of one protruding end portion 331f of the large segment 331 of the segment set S2, and the insertion portion 216a formed in the ring-shaped holding portion 216 includes The end of one protruding end 332f of the small segment 332 of the segment set S2 is held. These two protruding end portions 331f and 332f are joined to each other after the twist forming, and the two insertion portions 215a and 216a corresponding to these form a concave portion as a whole. Further, the insertion portion 217a formed in the ring-shaped holding portion 217 holds the end of the other protruding end portion 332g of the small segment 332 of the segment set S2, and the insertion portion 218a formed in the ring-shaped holding portion 218 is the segment. The other protruding end 331g of the large segment 331 of the set S2 is held. These two protruding end portions 332g and 331g are joined to each other after the twist forming, and the two insertion portions 217a and 218a corresponding thereto form a single concave portion as a whole.

  In the example shown in FIG. 6, assuming that the ring-shaped holding portion 211 arranged on the innermost circumference is the first and the ring-shaped holding portion 218 arranged on the outermost circumference is the eighth, four ring shapes arranged oddly The holding portions 211, 213, 215, and 217 are rotationally driven counterclockwise, and the even-numbered ring-shaped holding portions 212, 214, 216, and 218 are rotationally driven clockwise. In FIG. 6, the rotational drive direction is indicated by an arrow.

  Next, a rotational drive mechanism that rotationally drives the eight ring-shaped holding portions 211 to 218 will be described. FIG. 7 is a partial cross-sectional view showing details of the rotation drive mechanism. As shown in FIG. 7, the rotational drive mechanism provided in the conductor twisting device 200 of the present embodiment includes eight rotational drives connected to the eight ring-shaped holding parts 211 to 218 via connecting parts 311 to 318, respectively. Rings 321 to 328, two drive levers 340 and 342, and a rotational drive unit 350 as a drive source that rotationally drives these drive levers 340 and 342 to opposite sides along the circumferential direction are configured. Yes. The connecting portions 311, 313, 315, 317, the rotation drive rings 321, 323, 325, 327, the drive lever 340, and the rotation drive unit 350 constitute a first rotation drive mechanism. The coupling portions 312, 314, 316, 318, the rotation drive rings 322, 324, 326, 328, the drive lever 342, and the rotation drive portion 350 constitute a second rotation drive mechanism. Also, the rotation drive rings 321, 323, 325, and 327 are in the first rotation drive ring group, the rotation drive rings 322, 324, 326, and 328 are in the second rotation drive ring group, and the rotation drive unit 350 is in the first and second rotation drive ring groups. Each corresponds to a second rotation drive unit. The drive lever 340 corresponds to the first drive lever, and the drive lever 342 corresponds to the second drive lever.

  Each of the eight rotational drive rings 321 to 328 has a one-to-one correspondence with each of the eight ring-shaped holding portions 211 to 218. That is, the rotation drive ring 321 is connected to the ring-shaped holding part 211, and the ring-shaped holding part 211 can be rotated by rotating the rotation drive ring 321. Similarly, the rotation drive ring 322 is connected to the ring-shaped holding portion 212, and the ring-shaped holding portion 212 can be rotated by rotating the rotation drive ring 322. The rotation drive ring 323 is connected to the ring-shaped holding portion 213, and the ring-shaped holding portion 213 can be rotated by rotating the rotation drive ring 323. The rotation drive ring 324 is connected to the ring-shaped holding portion 214, and the ring-shaped holding portion 214 can be rotated by rotating the rotation drive ring 324. The rotation drive ring 325 is connected to the ring-shaped holding portion 215, and the ring-shaped holding portion 215 can be rotated by rotating the rotation drive ring 325. The rotation drive ring 326 is connected to the ring-shaped holding portion 216, and the ring-shaped holding portion 216 can be rotated by rotating the rotation drive ring 326. The rotation drive ring 327 is connected to the ring-shaped holding portion 217, and the ring-shaped holding portion 217 can be rotated by rotating the rotation drive ring 327. The rotation drive ring 328 is connected to the ring-shaped holding portion 218, and the ring-shaped holding portion 218 can be rotated by rotating the rotation drive ring 328.

  8 is a cross-sectional view taken along line VIII-VIII in FIG. As shown in FIG. 8, one drive lever 340 has an end fixed to a rotary drive ring 321 disposed on the innermost periphery. Further, assuming that the rotational drive ring 321 disposed on the innermost periphery is the first and the rotational drive ring 328 disposed on the outermost periphery is the eighth, this drive lever 340 is an odd number other than the innermost rotational drive ring 321. The second rotation drive rings 323, 325, and 327 are penetrated so as not to have a gap in the circumferential direction. Therefore, by rotating the drive lever 340 counterclockwise in FIG. 8, the odd-numbered four rotation drive rings 321, 323, 325, and 327 can be integrally rotated. In order to prevent the drive lever 340 from interfering with the even-numbered rotation drive rings 322, 324, 326, and 328 during this rotation drive, the even-numbered rotation drive rings have relief portions 322a, 324a, 326a and 328a are formed.

  9 is a cross-sectional view taken along line IX-IX in FIG. As shown in FIG. 9, the other drive lever 342 has an end fixed to the second rotational drive ring 322. The drive lever 342 passes through the even-numbered rotation drive rings 324, 326, and 328 other than the second rotation drive ring 322 so that there is no gap in the circumferential direction. Therefore, by rotating the drive lever 342 in the clockwise direction in FIG. 9, the even-numbered four rotation drive rings 322, 324, 326, and 328 can be integrally rotated. In order to prevent the drive lever 342 from interfering with the odd-numbered rotation drive rings 323, 325, 327 during this rotation drive, the odd-numbered rotation drive rings have escape portions 323a, 325a, 327a along the circumferential direction. Is formed.

  FIG. 10 is a cross-sectional view taken along the line XX of FIG. 7 and shows details of the rotation drive unit 350. 10 includes a motor 351, a speed reducer 352, a coupling 353, a bearing 354, a ball screw 355, and movable parts 356 and 358. In addition, the shape of the rotational drive part 350 shown in FIG. 7 has shown the VII-VII line cross section of FIG.

  The rotational force of the motor 351 is transmitted to the ball screw 355 via the speed reducer 352 and the coupling 353. One movable part 356 arranged on the non-motor side moves away from the motor 351 when the ball screw 355 rotates in a predetermined direction, and the other movable part 358 arranged on the motor side has the ball screw 355 arranged in a predetermined direction. The direction of the female thread groove provided in each is set so as to move toward the motor 351 when rotated in the direction.

  As shown in FIG. 8, the movable portion 356 has a concave portion 340a in which the cylindrical tip portion of the drive lever 340 is accommodated and the tip portion can be moved and rotated within a predetermined range. When the movable portion 356 moves in one direction (the direction from left to right in FIG. 8) along the direction in which the ball screw 355 extends, the drive lever 340 rotates about the central axis of the rotary drive ring 321 as the rotation center. Driven. Similarly, the movable portion 358 has a concave portion 342a in which the cylindrical tip portion of the drive lever 342 is accommodated and the tip portion can be moved and rotated within a predetermined range. When the movable portion 358 moves in one direction (the direction from right to left in FIG. 9) along the direction in which the ball screw 355 extends, the drive lever 342 rotates about the central axis of the rotation drive ring 322 as the rotation center. Driven. Accordingly, the rotation drive rings 321, 323, 325, and 327 are simultaneously rotated counterclockwise in FIG. 8 along with the rotation of the drive lever 340, and the rotation drive rings 322, 324, and 326 are rotated along with the rotation of the drive lever 342. 328 are simultaneously rotated in the clockwise direction in FIG.

  As described above, in the conductor twisting device 200 of the present embodiment, the eight electric conductors arranged along the radial direction can be twisted in the circumferential direction using the rotational drive mechanism including the drive levers 340 and 342. The number of drive levers equal to the number of electric conductors arranged along the radial direction and the configuration for individually driving these are not necessary, and the configuration can be simplified. Further, since the two drive levers 340 and 342 are simultaneously driven by using one ball screw 355, the number of motors required for rotationally driving the drive levers 340 and 342 can be reduced.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. In the embodiment described above, the two drive levers 340 and 342 are rotationally driven by the common rotational drive unit 350. However, a rotational drive unit may be provided corresponding to each of the two drive levers 340 and 342. Further, although the drive levers 340 and 342 are rotated in opposite directions by the rotation drive unit 350 as a drive source using the ball screw 355, other drive sources may be used.

  In addition, although the eight rotary drive rings 321 to 328 are rotated using the two drive levers 340 and 342, the drive lever is connected to each of the eight rotary drive rings 321 to 328, for a total of eight drives. The levers may be divided into two groups and rotated in different directions for each group.

  Moreover, in embodiment mentioned above, the ring-shaped holding | maintenance parts 211-218 are attached by attaching the drive levers 340 and 342 to the rotational drive rings 321-328 connected with the ring-shaped holding | maintenance parts 211-218 via the connection parts 311-318. Although the drive levers 340 and 342 are indirectly attached, the drive levers 340 and 342 may be directly attached to the ring-shaped holding portions 211 to 218.

It is an axial sectional view of a motor as a rotating electrical machine of one embodiment used for generating compressor power of a vehicle air conditioner. It is a perspective view of the segment which makes a part of stator coil. It is a fragmentary sectional view which shows the accommodation state of the segment in the slot provided in the stator core. It is a figure which shows the state which inserts into the slot the segment set which consists of a large segment and a small segment. It is a fragmentary sectional view of a conductor twist device. It is a partial top view of a ring-shaped holding part. It is a fragmentary sectional view showing details of a rotation drive mechanism. It is the VIII-VIII sectional view taken on the line of FIG. It is the IX-IX sectional view taken on the line of FIG. It is the XX sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator core 2 Rotor 3 Stator coil 4 Housing 7 Rotating shaft 33 Segment 100 Motor 200 Conductor twisting device 210 Coil pressing part 211-218 Ring-shaped holding | maintenance part 220, 222 Work fixing | fixed part 311-318 Connection part 321-328 Rotation drive ring 331 Large Segment 332 Small segment 340, 342 Drive lever 350 Rotation drive part 351 Motor 352 Reducer 353 Coupling 354 Bearing 355 Ball screw 356, 358 Movable part

Claims (2)

In a conductor twisting device that twists a plurality of electric conductors protruding in the axial direction from the end surface of the annular stator core and arranged in the radial direction in the circumferential direction,
A plurality of ring-shaped holding portions having a cylindrical shape for holding the tips of the plurality of electrical conductors;
A first rotation drive mechanism that is directly or indirectly connected to a part of the plurality of ring-shaped holding parts, or that rotates the part of the ring-shaped holding parts in one direction;
The second ring-shaped holding part is connected directly or indirectly via a connecting part to the rest of the plurality of ring-shaped holding parts, and the second ring-shaped holding part is rotated in the direction opposite to the rotation direction by the first rotation drive mechanism. A rotation drive mechanism ,
The first rotation drive mechanism includes a first rotation drive ring group that is separately connected to each of the partial ring-shaped holding portions via the connection portion and is rotatable, and the first rotation drive ring. A first rotational drive unit that rotationally drives the group simultaneously,
The second rotation drive mechanism includes a second rotation drive ring group that is separately connected to each of the remaining ring-shaped holding portions via the connection portion and is rotatable, and the second rotation drive ring group. A second rotational drive unit that simultaneously rotationally drives
The first rotation drive unit includes a first drive lever coupled to the first rotation drive ring group,
The second rotation drive unit includes a second drive lever connected to the second rotation drive ring group,
Wherein the first and second driving levers, conductor twisting apparatus according to claim Rukoto rotate in opposite directions using a common drive source. In claim 1,
The part of the ring-shaped holding portion that is rotated in one direction by the first rotation driving mechanism and the remaining ring-shaped holding portion that is rotated in the opposite direction by the second rotation driving mechanism are along the radial direction. A conductor twisting device characterized by being alternately arranged.

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