CN115940542A - twisting device - Google Patents

Abstract

A twisting device (1) twists the end portions of a plurality of first conductors and second conductors protruding in the axial direction of a stator core, among a plurality of first conductors (105) and second conductors (106) inserted into slots (103) of a stator core (101) having a cylindrical stator core body (102) and a plurality of teeth (103) located on the inner peripheral side of the stator core body and extending radially inward, and further comprises: a cylindrical third holding jig (5) which is arranged in a circumferential direction and holds a plurality of holding sections (7) for holding end sections of the first and second conductors and which is movable in the circumferential direction; a circumferential driving device (8) which moves at least one of the third holding jig and the stator core relative to the other in the circumferential direction under the state that the axis (P) of the stator core is consistent with the axis of the third holding jig; and a partition wall (11) which is arranged adjacent to the third holding jig in the radial direction and protrudes in the axial direction of the third holding jig than the third holding jig.

Description

Twisting device

Technical Field

The present invention relates to a twisting device.

Background

In a stator of a rotating electrical machine, a plurality of conductors constituting a stator coil are inserted into a plurality of slots of a stator core in which a plurality of electromagnetic steel plates are laminated, respectively. The plurality of conductors are inserted into the plurality of slots, and then conductors adjacent to each other in the circumferential direction are joined to each other, thereby forming the stator coil. In order to join the conductors adjacent to each other in the circumferential direction among the plurality of conductors inserted into the plurality of slots, it is necessary to twist an end portion protruding from the stator core in the circumferential direction of the stator core.

A twisting device is known which twists the end portions of the plurality of conductors in the circumferential direction in such a stator. The twisting device twists the end portions of the conductors inserted into the slots of the stator core in the circumferential direction by moving a cylindrical holding jig having a plurality of conductor insertion portions arranged in the circumferential direction. For example, patent document 1 discloses a twisting device including a plurality of cylindrical holding jigs. The holding jig has a conductor insertion portion that is a plurality of holes that open in the axial direction of the holding jig. The radial position of the conductor introduction portion in the holding jig is determined based on the position of the conductor. The twisting device twists the end portions of the conductors in the circumferential direction by moving the plurality of cylindrical holding jigs in the circumferential direction while holding the end portions of the conductors by the conductor insertion portions.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2000-92797

Disclosure of Invention

Problems to be solved by the invention

Conductors that need to ensure electrical insulation and conductors that do not need to ensure electrical insulation are sometimes inserted into the slots of the stator core. In such a stator structure, the radial interval between the conductors that need to be electrically insulated needs to be wider than the interval between the conductors that do not need to be electrically insulated. Therefore, it is necessary to control the radial interval of the conductor insertion portion in the holding jig according to the distance of electrical insulation required for the conductor.

However, the conductor inserted into the slot has a large radial position variation due to a forming error, deflection, deformation, or the like of the conductor. Therefore, when the end portion of the conductor is twisted in the circumferential direction by the twisting device, it is necessary to insert the end portion of the conductor into the conductor insertion portion while suppressing the radial positional deviation of the conductor. Thus, the conventional twisting apparatus becomes a factor that hinders the productivity improvement of the stator.

The present invention provides a twisting device capable of improving productivity of the stator by easily twisting the conductors in the circumferential direction and forming a gap in the radial direction between the conductors.

Means for solving the problems

A twisting device according to an embodiment of the present invention twists end portions of a plurality of conductors, which protrude in an axial direction of a stator core, among the plurality of conductors inserted into slots of the stator core, and the stator core includes a cylindrical stator core main body portion and a plurality of teeth located on an inner peripheral side of the stator core main body portion and extending radially inward. The twisting device comprises: a cylindrical holding jig which has a plurality of holding portions arranged in a circumferential direction and holding end portions of the plurality of conductors, and which is movable in the circumferential direction; a circumferential driving device that moves at least one of the holding jig and the stator core in a circumferential direction relative to the other in a state where an axis of the stator core and an axis of the holding jig coincide with each other; and a partition wall that is disposed adjacent to the holding jig in the radial direction and protrudes in the axial direction of the holding jig from the holding jig.

Effects of the invention

According to the twisting device of one embodiment of the present invention, the productivity of the stator can be improved by easily performing the circumferential twisting of the conductors and the formation of the radial gap between the conductors.

Drawings

Fig. 1 is a perspective view of a stator core and conductors.

Fig. 2 is a partial plan view of the stator as viewed in the axial direction.

Fig. 3 is a longitudinal sectional view of a twisting device according to embodiment 1 of the present invention.

Fig. 4 is a plan view and a side view of a holding jig in the twisting device according to embodiment 1 of the present invention.

Fig. 5 is a partial cross-sectional view of a holding portion and a partition wall of a holding jig in a twisting apparatus according to embodiment 1 of the present invention, as viewed in a circumferential direction.

Fig. 6 is a partial cross-sectional view, as viewed in the circumferential direction, showing a state in which a conductor is moved in the radial direction by a partition wall in the twisting device according to embodiment 1 of the present invention.

Fig. 7 is a partial cross-sectional view of a holding portion and a partition wall of a holding jig in a twisting device according to a second embodiment of the present invention as viewed in a circumferential direction.

In the figure:

1-twisting means, 2-load receiving member, 2 a-positioning portion, 2 b-placing surface, 3-first holding jig, 3 a-connecting portion, 4-second holding jig, 4 a-connecting portion, 5-third holding jig, 5 a-connecting portion, 6-fourth holding jig, 6 a-connecting portion, 7-holding portion, 8-circumferential driving means, 9-placing table, 9 a-through hole, 10-axial direction driving means, 11, 12-partition wall, 11 a-inner guide surface, 11 b-outer guide surface, W1-radial width of outer guide surface, W2-axial width of outer guide surface, W3-radial width of inner guide surface, W4-axial width of inner guide surface, 100-stator, 101-stator core, 102-stator core main body portion, 103-tooth, 103 a-through hole, 104-groove, 105-first conductor, 105 a-inner leg portion, 105 b-outer leg portion, 105 c-bending portion, 106 a-second conductor, 106 a-inner leg portion, 106 c-bending portion, 106 b-inner leg portion.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated. The dimensions of the components in the drawings do not faithfully represent the actual dimensions of the components, the dimensional ratios of the components, and the like.

In the following description of the twisting device 1 as an exemplary embodiment of the present invention, a direction parallel to the axis P of the stator 100 is referred to as an "axial direction", a direction orthogonal to the axis P is referred to as a "radial direction", and a direction along an arc centered on the axis P is referred to as a "circumferential direction". The vertical direction in which the twisting device 1 is installed is referred to as the "up-down direction". However, the orientation of the twisting device 1 in use is not intended to be defined by the definition of this direction.

In the following description, expressions such as "fixing", "connecting", "joining", and "attaching" (hereinafter, fixing and the like) include not only a case where components are directly fixed to each other and the like, but also a case where components are fixed via other components and the like. In other words, in the following description, expressions such as fixing include direct and indirect fixing of members.

In the following description, the stator 100 is an armature on the stationary side of a rotating electrical machine, and includes a stator core 101, which is a housing formed by laminating electromagnetic steel plates in the thickness direction, and a plurality of first conductors 105 and a plurality of second conductors 106. The stator 100 is cylindrical. The stator 100 has a through hole for receiving the rotor. In the present embodiment, four conductors are positioned in the slots 104 of the stator core 101.

(Structure of stator 100)

The stator 100 will be described with reference to fig. 1 and 2. Fig. 1 is a perspective view of stator core 101 and first conductor 105 and second conductor 106. Fig. 2 is a partial plan view as viewed in the axial direction of the stator 100.

As shown in fig. 1 and 2, the stator 100 has a stator core 101, a plurality of first conductors 105, and a plurality of second conductors 106. Stator core 101 is formed of a plurality of annular electromagnetic steel plates formed into a predetermined shape and laminated in the thickness direction. The stacked electromagnetic steel sheets have a plurality of portions on the outer peripheral surface welded to each other in the thickness direction. Stator core 101 includes a cylindrical stator core body 102, a plurality of teeth 103 extending radially inward from the inner circumferential side of stator core body 102, and slots 104 into which first and second conductors 105 and 106 are inserted between adjacent teeth 103 among the plurality of teeth 103. The stator 100 has a through hole 103a for accommodating a rotor, not shown.

The first conductor 105 is a member constituting a part of a stator coil, not shown. The first conductor 105 is a linear member having a predetermined length and is bent at a central portion. First conductor 105 includes inner leg 105a, outer leg 105b, and bend 105c. Inner leg 105a and outer leg 105b of first conductor 105 are linear portions having substantially the same length. The inner leg 105a and the outer leg 105b of the first conductor 105 are arranged at intervals of the number of slots determined by the number of magnetic poles of the stator 100 in the circumferential direction with the longitudinal direction as the axial direction. The bent portion 105c of the first conductor 105 is a bent portion located between the inner leg 105a and the outer leg 105b of the first conductor 105. Bent portion 105c of first conductor 105 is coupled to the same-direction end portions of inner leg 105a and outer leg 105b of first conductor 105.

The second conductor 106 is a member constituting a part of a stator coil, not shown. The second conductor 106 is a linear member having a predetermined length and is bent at a central portion. The second conductor 106 includes an inner leg 106a, an outer leg 106b, and a bend 106c. The inner leg 106a and the outer leg 106b of the second conductor 106 are linear portions having substantially the same length. The inner leg 106a and the outer leg 106b of the second conductor 106 are arranged at intervals of the number of slots determined by the number of magnetic poles of the stator 100 in the circumferential direction with the longitudinal direction as the axial direction. Further, the inner leg 106a and the outer leg 106b of the second conductor 106 are arranged at a larger interval than the radial width of the first conductor 105 in the radial direction, with the longitudinal direction as the axial direction. The bent portion 106c of the second conductor 106 is a bent portion located between the inner leg 106a and the outer leg 106b of the second conductor 106. The bent portion 106c of the second conductor 106 is connected to the same-direction end portions of the inner leg portion 106a and the outer leg portion 106b of the second conductor 106.

The first conductor 105 and the second conductor 106 are inserted as a set of conductors into two slots 104 separated by a gap T determined by the number of poles through an insulator 107. The first conductor 105 has the longitudinal direction of the inner leg 105a and the outer leg 105b as the axial direction, and the inner leg 105a and the outer leg 105b are respectively located in two slots 104 separated by a gap T determined by the number of magnetic poles. Inner leg 105a of first conductor 105 is located radially inward of outer leg 105b of first conductor 105. The second conductor 106 has the longitudinal direction of the inner leg 106a and the outer leg 106b as the axial direction, and the inner leg 106a and the outer leg 106b are respectively located in two slots 104 separated by a gap T determined by the number of magnetic poles. The inner leg 106a of the second conductor 106 is located radially inward of the outer leg 106b of the second conductor 106. In this way, in each slot 104, the outer leg 106b of the second conductor 106, the outer leg 105b of the first conductor 105, the inner leg 105a of the first conductor 105, and the outer leg 106b of the second conductor 106 are arranged in this order from the radially outer side toward the radially inner side.

The end portions of inner leg portion 105a and outer leg portion 105b of first conductor 105 and the end portions of inner leg portion 106a and outer leg portion 106b of second conductor 106 protrude from stator core 101 in one axial direction. Bent portion 105c of first conductor 105 and bent portion 106c of second conductor 106 protrude from stator core 101 in the other axial direction. The end portions of the inner leg portion 105a and the outer leg portion 105b of the first conductor 105 and the end portions of the inner leg portion 106a and the outer leg portion 106b of the second conductor 106 are twisted in the circumferential direction by a twisting device 1 described later.

(embodiment mode 1)

Next, an exemplary embodiment 1 of the twisting device 1 according to the present invention will be described with reference to fig. 3 to 5. Fig. 3 is a longitudinal sectional view of the twisting device 1. Fig. 4 is a plan view and a side view of the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6 in the twisting device 1. Fig. 5 is a partial sectional view of the holding portion 7 and the partition wall 11 of the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6 in the twisting device 1 as viewed in the circumferential direction.

As shown in fig. 3, the twisting device 1 is a device for twisting an end portion of the first conductor 105 and an end portion of the second conductor 106 of the stator 100 in the circumferential direction. The twisting apparatus 1 includes a load receiving member 2, a first holding jig 3, a second holding jig 4, a third holding jig 5, a fourth holding jig 6, a circumferential driving device 8, a mounting table 9, an axial driving device 10, and a partition wall 11.

The load receiving member 2 is a member that supports the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6 to which a load is applied from the axial direction driving device 10. The load receiving member 2 is supported by a base of the twisting device 1, not shown. The load receiving member 2 has a columnar positioning portion 2a that positions the radial position of the first holding jig 3. The positioning portion 2a is disposed such that the axis is in the vertical direction. The load receiving member 2 has a mounting surface 2b for rotatably supporting the first holding jig 3. The mounting surface 2b is perpendicular to the axis of the positioning portion 2a.

The first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6, which are holding jigs, hold the inner leg portion 105a, i.e., the outer leg portion 105b of the first conductor 105 and the inner leg portion 106a and the outer leg portion 106b of the second conductor 106. The first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6 have a cylindrical shape.

The first holding jig 3 holds the holding jig of the inner leg portion 106a of the second conductor 106 positioned radially innermost in the stator 100. The first holding jig 3 is a holding jig with the smallest inner diameter. The first holding jig 3 is placed on the placement surface 2b of the load receiving member 2 with the axis thereof oriented in the vertical direction. In addition, the radial position of the first holding jig 3 is held by a part of the circumferential driving device 8. At this time, the axis of the first holding jig 3 coincides with the axis of the positioning portion 2a. Further, the first holding jig 3 is rotatably supported by the load receiving member 2. The first holding jig 3 has a connecting portion 3a that transmits power of the circumferential driving device 8. The first holding jig 3 has a holding portion 7 for holding the inner leg portion 106a of the second conductor 106 at the upper end portion in the axial direction.

Second holding jig 4 is a holding jig for holding inner leg 105a of first conductor 105 positioned adjacent to inner leg 106a of second conductor 106 and radially outward of inner leg 106a of stator 100. The second holding jig 4 is adjacently located radially outward of the first holding jig 3. The second holding jig 4 is supported rotatably by the first holding jig 3 with its axis in the vertical direction. In addition, the radial position of the second holding jig 4 is held by a part of the circumferential driving device 8. At this time, the axis of the second holding jig 4 coincides with the axis of the first holding jig 3. The second holding jig 4 has a connecting portion 4a that transmits power of the circumferential driving device 8. The second holding jig 4 has a holding portion 7 for holding the inner leg portion 105a of the first conductor 105 at an upper end portion in the axial direction.

Third holding jig 5 is a holding jig for holding outer leg 105b of first conductor 105 positioned adjacent to inner leg 105a of first conductor 105 in the radial direction in stator 100. The third holding jig 5 is adjacently located radially outward of the second holding jig 4. The third holding jig 5 is supported rotatably by the second holding jig 4 with its axis in the vertical direction. In addition, the radial position of the third holding jig 5 is held by a part of the circumferential driving device 8. At this time, the axis of the third holding jig 5 coincides with the axis of the second holding jig 4. The third holding jig 5 has a connecting portion 5a that transmits power of the circumferential driving device 8. The third holding jig 5 has a holding portion 7 for holding the outer leg portion 105b of the first conductor 105 at an upper end portion in the axial direction.

Fourth holding jig 6 is a holding jig for holding outer leg 106b of second conductor 106 positioned adjacent to and radially outward of outer leg 105b of first conductor 105 in stator 100. The fourth holding jig 6 is adjacently located radially outward of the third holding jig 5. The fourth holding jig 6 is supported rotatably by the third holding jig 5 with its axis in the vertical direction. In addition, the radial position of the fourth holding jig 6 is held by a part of the circumferential driving device 8. At this time, the axis of the fourth holding jig 6 coincides with the axis of the third holding jig 5. Therefore, the axes of the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6 coincide. The fourth holding jig 6 has a connecting portion 6a that transmits power of the circumferential driving device 8. The fourth holding jig 6 has a holding portion 7 that holds the outer leg portion 106b of the second conductor 106 at the upper end portion in the axial direction.

As shown in fig. 4, the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6, which are cylindrical, have a plurality of holding portions 7 that are positioned side by side in the circumferential direction at the upper end portion in the axial direction. The plurality of holding portions 7 are provided at the same interval as the interval between the slots 104 of the stator core 101. The holding portion 7 is a concave portion that is concave in the upper direction of the axial direction. Further, the holding portion 7 is opened in the radial direction. That is, the first holding jig 3 has a holding portion 7 as a cutout extending in the axial direction from the upper end portion.

As shown in fig. 3, the circumferential driving device 8 is a driving device that moves the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6 in the circumferential direction. The circumferential driving device 8 is constituted by a servomotor capable of controlling a movement amount, a movement speed, a torque, and the like, for example. The circumferential driving device 8 is supported by a base of the twisting device 1, not shown. The circumferential driving device 8 includes a first driving motor 8a for moving the first holding jig 3, a second driving motor 8b for moving the second holding jig 4, a third driving motor 8c for moving the third holding jig 5, and a fourth driving motor 8d for moving the fourth holding jig 6. The first drive motor 8a is connected to the connecting portion 3a of the first holding jig 3. The second drive motor 8b is connected to the connecting portion 4b of the second holding jig 4. The third drive motor 8c is connected to the connecting portion 5a of the third holding jig 5. The fourth drive motor 8d is connected to the connecting portion 6a of the fourth holding jig 6. The first drive motor 8a, the second drive motor 8b, the third drive motor 8c, and the fourth drive motor 8d are independently driven.

The mounting table 9 is a table for positioning the stator 100 with respect to the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6. The mounting table 9 is positioned above the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6. The mounting table 9 is supported by the circumferential driving device 8. The mounting table 9 is configured to be movable in the axial direction. The mounting table 9 has a through hole 9a. The mounting table 9 supports the stator 100 at a position where the axis of the stator 100 coincides with the axes of the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6. Only the stator core 101 of the stator 100 contacts the table 9. That is, the first conductor 105 and the second conductor 106 are located in the through hole 9a.

The axial direction driving device 10 is a device that moves the stator 100 in the axial direction. The axial direction driving device 10 is constituted by a servo motor capable of controlling a moving amount, a moving speed, a torque, and the like, for example. The axial direction driving device 10 is supported by a base of the twisting device 1, not shown. The axial direction driving device 10 is located above the mounting table 9. The axial direction driving device 10 moves the stator 100 mounted on the mounting table 9 in the axial direction. At this time, the axial direction driving device 10 presses the stator core 101 and the first and second conductors 105 and 106 in the axial direction.

As shown in fig. 4 and 5, the twisting device 1 has a partition wall 11. The partition wall 11 is a member that enlarges the radial distance between the inner leg 105a of the first conductor 105 and the outer leg 105b of the first conductor 105. The partition wall 11 has a cylindrical shape. The partition wall 11 is located between the second holding jig 4 and the third holding jig 5. That is, the partition wall 11 is adjacent to the second holding jig 4 and the third holding jig 5 in the radial direction. Further, the partition wall 11 is located radially inward of the third holding jig with respect to the holding portion 7 of the third holding jig. The radial position of the partition wall 11 is held by the inner peripheral surface of the third holding jig 5. At this time, the axis P1 of the partition wall 11 coincides with the axis of the third holding jig 5. The partition wall 11 is rotatably supported by the load receiving member 2. In the present embodiment, the partition wall 11 is fixed to the third holding jig 5. The partition wall 11 moves in the circumferential direction together with the third holding jig 5. The partition wall 11 may be a member integrated with the third holding jig 5.

The partition wall 11 protrudes in the axial direction from an opening-side end portion of the third holding jig 5, which is a recess of the holding portion 7. That is, the partition wall 11 protrudes in the axial direction beyond the axial upper end of the third holding jig 5. The upper end portion of the partition wall 11, which is the end portion in the axial direction protruding from the third holding jig, has an inner guide surface 11a and an outer guide surface 11b as end portion guide surfaces. The inner guide surface 11a is located radially inward of the partition wall 11. The outer guide surface 11b is located radially outward of the partition wall 11.

The inner guide surface 11a is located radially outward as it goes upward in the axial direction. The outer guide surface 11b is located radially inward as it goes upward in the axial direction. That is, the partition wall 11 has an inner guide surface 11a and an outer guide surface 11b as end guide surfaces whose radial thickness becomes smaller toward the front end in the direction protruding from the upper end portion of the third holding jig 5. The inner end of the outer guide surface 11b and the outer end of the inner guide surface 11a are connected at the upper end of the partition wall 11.

In the twisting apparatus 1 configured as described above, the stator 100 mounted on the mounting table 9 is moved in the downward direction, which is the direction of the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6, by the axial direction driving device 10. First, first conductor 105 and second conductor 106 of stator 100 are inserted between inner leg 105a and outer leg 105b of first conductor 105 by partition wall 11. The twisting device 1 enlarges the radial interval between the inner leg 105a and the outer leg 105b of the first conductor 105 by the partition wall 11. The end portions of the first conductor 105 and the second conductor 106 are inserted into the holding portions 7 of the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6, respectively.

Next, in the twisting device 1, in a state where the end portions of the plurality of first conductors 105 and second conductors 106 are inserted into the first holding jig 3, second holding jig 4, third holding jig 5, and fourth holding jig 6, the first holding jig 3, second holding jig 4, third holding jig 5, and fourth holding jig 6 are moved in the circumferential direction by the circumferential driving device 8, and the stator 100 is moved downward by the axial driving device 10. Thus, the twisting device 1 twists the respective end portions of the first conductor 105 and the second conductor 106 in the circumferential direction by the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6 while separating the inner leg portion 105a and the outer leg portion 105b of the first conductor 105 by the partition wall 11.

In the twisting device 1 configured as described above, the partition walls 11 are inserted between the plurality of inner leg portions 105a and the outer leg portions 105b from the axial direction before the plurality of first conductors 105 and the plurality of second conductors 106 are inserted into the holding portions 7 of the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6, respectively. The partition 11 moves the first conductor 105 and the second conductor 106 in the radial direction until the ends of the first conductor 105 and the second conductor 106 contact the bottom surface of the holding portion 7 and the like and the movement in the radial direction is restricted.

Even if the first conductor 105 and the second conductor 106 are displaced in the radial direction, the twisting device 1 can easily insert the partition wall 11 between the inner leg portion 105a and the outer leg portion 105b of the first conductor 105 by the deflection of the first conductor 105 and the second conductor 106.

Next, the movement of the first conductor 105 and the second conductor 106 in the radial direction by the partition wall 11 of the twisting device 1 according to embodiment 1 will be described in detail with reference to fig. 5 and 6. Fig. 6 is a partial cross-sectional view, as viewed in the circumferential direction, showing a state in which the first conductor 105 and the second conductor 106 are moved in the radial direction by the partition wall 11 in the twisting device 1.

As shown in fig. 5, the partition wall 11 has an inner guide surface 11a and an outer guide surface 11b as end guide surfaces. The inner guide surface 11a is located radially inward of the partition wall 11. The outer guide surface 11b is located radially outward of the partition wall 11. The radial width W1 of the outer guide surface 11b is larger than the radial width W3 of the inner guide surface 11 a. Further, the axial width W2 of the outer guide surface 11b is larger than the axial width W4 of the inner guide surface 11 a.

As shown in fig. 6, in the twisting apparatus 1, the partition wall 11 is moved upward with respect to the first conductor 105 and the second conductor 106 by the axial driving device 10. The partition wall 11 enters between the inner leg 105a of the first conductor 105 and the outer leg 105b of the first conductor 105.

When the inner leg 105a of the first conductor 105 contacts the inner guide surface 11a, the partition wall 11 generates a force (see an arrow) directed radially inward from the inner guide surface 11a to the inner leg 105a of the first conductor 105. Thereby, the holding portion 7 moves the inner leg portion 105a of the first conductor 105 radially inward. When the outer leg 105b of the first conductor 105 contacts the outer guide surface 11b, the partition wall 11 generates a force (see an arrow) directed radially outward from the outer guide surface 11b to the outer leg 105b of the first conductor 105. Thereby, the holding portion 7 moves the outer leg portion 105b of the first conductor 105 outward in the radial direction.

The radial width W1 of the outer guide surface 11b of the partition wall 11 is larger than the radial width W3 of the inner guide surface 11a (see fig. 5). Therefore, in the case where the coupling portion of the outer guide surface 11b and the inner guide surface 11a of the partition wall 11 is located between the inner leg 105a and the outer leg 105b of the first conductor 105, the amount of movement of the outer guide surface 11b to move the outer leg 105b of the first conductor 105 radially outward is larger than the amount of movement of the inner guide surface 11a to move the inner leg 105a of the first conductor 105 radially inward. Thus, the partition wall 11 moves the outer leg 105b of the first conductor 105 and the outer leg 106b of the second conductor 106a lot to the outside in the radial direction where the interval is easily expanded in the radial direction.

The twisting device 1 spreads the radial gap between the inner leg 105a and the outer leg 105b of the first conductor 105 mainly radially outward by the partition wall 11, and twists the end portions of the first conductor 105 and the second conductor 106 in the circumferential direction by the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6.

The twisting device 1 according to the present invention is a twisting device for twisting the end portions of a plurality of first conductors 105 and second conductors 106 protruding in the direction of the axis P of a stator core 101 out of a plurality of first conductors 105 and second conductors 106 inserted into slots 104 of the stator core 101, wherein the stator core 101 has a cylindrical stator core body 102 and a plurality of teeth 103 located on the inner circumferential side of the stator core body 102 and extending radially inward. The twisting device 1 includes: a first holding jig 3, a second holding jig 4, a third holding jig 5, and a fourth holding jig 6 each having a plurality of holding portions 7 arranged in a row in the circumferential direction and holding end portions of the first conductor 105 and the second conductor 106, and being movable in the circumferential direction; a circumferential driving device 8 that moves at least one of the first holding jig 3, the second holding jig 4, the third holding jig 5, the fourth holding jig 6, and the stator core 101 in a circumferential direction relative to the other in a state where the axis P of the stator core 101 coincides with the axes of the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6; and a partition wall 11 that is disposed adjacent to the third holding jig 5 in the radial direction and protrudes in the axial direction from the third holding jig 5.

Further, an axial direction driving device 10 is provided, and the axial direction driving device 10 moves at least one of the first holding jig 3, the second holding jig 4, the third holding jig 5, the fourth holding jig 6, the partition wall 11, and the stator core 101 relative to the other in the axial direction of the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6.

In the above-described configuration, the partition wall 11 is inserted between the inner leg portion 105a and the outer leg portion 105b of the adjacent first conductor 105 held by the holding portion 7 from the axial direction of the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6. The partition wall 11 moves the adjacent inner leg 105a and outer leg 105b in the radial direction with respect to each other before the end of the first conductor 105 contacts the bottom surface of the holding portion 7 and the radial movement of the first conductor 105 is restricted. Even if the positions of the inner leg portion 105a and the outer leg portion 105b in the radial direction are deviated, the partition wall 11 can be easily inserted between the inner leg portion 105a and the outer leg portion 105b by the flexure of the inner leg portion 105a and the outer leg portion 105 b. Accordingly, twisting of the first conductor 105 and the second conductor 106 in the circumferential direction and formation of the radial gap between the inner leg portion 105a and the outer leg portion 105b are facilitated, and productivity of the stator 100 can be improved.

Further, since the first holding jig 3, the second holding jig 4, the third holding jig 5, the fourth holding jig 6, and at least one of the partition wall 11 and the stator core 101 are moved relative to the other in the axial direction of the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6, the holding portion 7 twists the first conductor 105 and the second conductor 106 in the circumferential direction while maintaining the positions relative to the first conductor 105 and the second conductor 106. The partition wall 11 radially expands the inner leg 105a and the outer leg 105b while applying an axial force to the inner leg 105a and the outer leg 105 b. Accordingly, even if the assembly accuracy of the first conductor 105 and the second conductor 106 is low, the first conductor 105 and the second conductor 106 can be easily twisted in the circumferential direction and the gap in the radial direction between the inner leg portion 105a and the outer leg portion 105b can be easily formed, and thus the productivity of the stator 100 can be improved.

Further, the partition wall 11 has an inner guide surface 11a and an outer guide surface 11b as end guide surfaces whose radial thickness becomes smaller toward the front end in the protruding direction than the third holding jig 5 at the end in the protruding direction.

In the above structure, the end portions of the inner leg 105a and the outer leg 105b are inserted into the holding portion 7 and are expanded in the radial direction along the inner guide surface 11a or the outer guide surface 11b of the partition wall 11. Further, since the partition wall 11 has a smaller radial thickness in the direction protruding from the third holding jig 5, it is easy to insert the partition wall between the inner leg 105a and the outer leg 105b adjacent to each other. Accordingly, twisting of the first conductor 105 and the second conductor 106 in the circumferential direction and formation of the radial gap between the inner leg portion 105a and the outer leg portion 105b can be easily performed, thereby improving productivity of the stator 100.

In addition, the partition wall 11 is moved together with the third holding jig 5 by the circumferential driving device 8. The partition wall 11 is moved by the same movement amount as the movement amount of the third holding jig 5 in the same direction as the movement direction of the third holding jig 5 and at the same speed as the movement speed of the third holding jig. Therefore, the partition wall 11 prevents friction from being generated between the first conductor 105 and the second conductor 106 when the first conductor 105 and the second conductor 106 are twisted. This facilitates twisting of the first and second conductors 105 and 106 in the circumferential direction and formation of a radial gap between the inner leg 105a and the outer leg 105b, thereby improving productivity of the stator 100.

Further, the partition wall 11 is located radially inward of the third holding jig 5 with respect to the holding portion 7. The ends of the inner leg 105a and the outer leg 105b are inserted into the holding portion 7, and are opened outward in the radial direction of the holding portion 7 by the partition wall 11. The inner leg 105a and the outer leg 105b are twisted in the circumferential direction while being held at the radial positions by the partition wall 11, and therefore the radial positions are not changed by the twisting. Accordingly, twisting of the first conductor 105 and the second conductor 106 in the circumferential direction and formation of the radial gap between the inner leg portion 105a and the outer leg portion 105b can be easily performed, thereby improving productivity of the stator 100.

The partition wall 11 is cylindrical, and the axis P1 of the partition wall 11 coincides with the axis of the third holding jig 5. The partition wall 11 opens the inner leg 105a and the outer leg 105b on an arc of the same diameter. The twisting in the circumferential direction of the first conductor 105 and the second conductor 106 and the formation of the radial gap between the inner leg 105a and the outer leg 105b can be easily performed, thereby improving the productivity of the stator 100.

(embodiment mode 2)

Hereinafter, an exemplary embodiment 2 of the twisting device 1 according to the present invention will be described with reference to fig. 3 and 7. Fig. 7 is a partial cross-sectional view of the holding portion 7 and the partition wall 12 of the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6 in the twisting device 1 as viewed in the circumferential direction. In the following description, the same components as those in embodiment 1 are denoted by the same reference numerals, and description thereof is omitted, and only portions different from embodiment 1 will be described.

As shown in fig. 3, the twisting device 1 has a first holding jig 3, a second holding jig 4, a third holding jig 5, and a fourth holding jig 6.

As shown in fig. 7, the third holding jig 5 has a holding portion 7 and a partition wall 12. The holding portion 7 is located at an upper end portion in the axial direction of the third holding jig 5. The partition wall 12 is located radially inward of the holding portion 7 and extends axially upward from the bottom surface of the holding portion 7. The partition wall 12 protrudes above the opening-side end of the holding portion 7 in the axial direction. The partition wall 12 is in close contact with the holding portion 7 and covers the radially inward side of the holding portion 7. In this way, the partition wall 12 constitutes a part of the third holding jig 5. That is, the partition wall 12 and the third holding jig 5 are an integral member.

The partition wall 12 has a shorter width in the axial direction than in the case where it is provided separately from the third holding jig 5. Therefore, the partition wall 12 has higher rigidity than the case where it is provided separately from the third holding jig 5. Therefore, the partition wall 12 can spread the plurality of first conductors 105 and second conductors 106 in the radial direction at the same time.

The partition wall of the twisting device 1 of the present invention is an integral member with the third holding jig 5. The partition wall 12 extends as a part of the third holding jig 5 in the axial direction of the third holding jig 5. That is, the strength of the partition wall 12 can be increased by the third holding jig 5. Therefore, the partition wall 12 can spread the plurality of first conductors 105 and second conductors 106 in the radial direction at the same time. Accordingly, twisting of the first conductor 105 and the second conductor 106 in the circumferential direction and formation of the radial gap between the inner leg portion 105a and the outer leg portion 105b are facilitated, and productivity of the stator 100 can be improved.

(other embodiments)

The embodiments of the present invention have been described above, but the above embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above embodiment, and can be implemented by appropriately modifying the above embodiment without departing from the scope of the invention.

In the above embodiment, the circumferential driving device 8 moves the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6 in the circumferential direction. However, the circumferential moving device may move the stator 100 in the circumferential direction in a state where the axis of the stator 100 and the axis of each holding jig coincide with each other. The circumferential moving device may move the stator 100 and the holding jigs in the circumferential direction in a state where the axis of the stator 100 and the axis of the holding jigs are aligned with each other. That is, the circumferential moving device moves at least one of the holding jig and the stator in the circumferential direction with respect to the other in a state where the axis of the stator 100 and the axis of the holding jig coincide with each other.

In the above embodiment, the axial direction driving device 10 moves the stator 100 in the axial direction. However, the axial direction driving device may move the first holding jig, the second holding jig, the third holding jig, and the fourth holding jig in the axial direction. The axial direction moving device may move the stator 100 and the holding jigs in the axial direction. That is, the axial direction moving device moves the holding jig and at least one of the partition wall and the stator core relative to the other in the axial direction of the holding jig.

In the above-described embodiment, the twisting device 1 forms the radial gap between the inner leg 105a and the outer leg 105b of the first conductor 105 by the partition wall 11, and then twists the first conductor 105 and the second conductor 106 in the circumferential direction by the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6. However, the twisting device may simultaneously perform formation of the radial gap between the inner leg portion 105a and the outer leg portion 105b by the partition wall and circumferential twisting by the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6.

In the above-described embodiment, the twisting device 1 has the first holding jig 3, the second holding jig 4, the third holding jig 5, and the fourth holding jig 6. However, the twisting device may have only one or more holding jigs.

In the above embodiment, the partition wall 11 and the partition wall 12 are positioned between the second holding jig 4 and the third holding jig 5. However, the partition wall may be disposed adjacent to any holding jig.

In the above-described embodiment, the partition wall 11 is moved together with the third holding jig 5 by the circumferential drive device 8. However, the partition wall may not move in the circumferential direction together with the holding jig. The partition wall may be constant in both the radial position and the axial position with respect to the holding jig.

Availability in production

The invention is applicable to twisting devices.

Claims (7)

1. A twisting device twists end portions of a plurality of conductors inserted into slots of a stator core, the plurality of conductors protruding in an axial direction of the stator core, the stator core having a cylindrical stator core main body portion and a plurality of teeth located on an inner peripheral side of the stator core main body portion and extending radially inward,

the twisting device is characterized by comprising:

a cylindrical holding jig which has a plurality of holding portions arranged in a row in a circumferential direction and holding end portions of the plurality of conductors, and which is movable in the circumferential direction;

a circumferential driving device that moves at least one of the holding jig and the stator core in a circumferential direction relative to the other in a state where an axis of the stator core and an axis of the holding jig are aligned; and

and a partition wall that is disposed adjacent to the holding jig in the radial direction and protrudes in the axial direction of the holding jig from the holding jig.

2. The twisting device according to claim 1,

the partition wall has an end guide surface at an end in a direction protruding from the holding jig, and a radial thickness of the end guide surface decreases toward a front end in the protruding direction.

3. The twisting device according to claim 1 or 2,

the partition wall is moved together with the holding jig by the circumferential driving means.

4. The twisting device according to any one of claims 1 to 3,

the partition wall is located radially inward of the holding jig with respect to the holding portion.

5. The twisting device according to any one of claims 1 to 4,

the partition wall is cylindrical, and an axis of the partition wall coincides with an axis of the holding jig.

6. Twisting device according to any of claims 1 to 5, wherein the drive shaft is a hollow shaft

The partition wall and the holding jig are a single member.

7. The twisting device according to any one of claims 1 to 6,

the stator core holding device includes an axial direction driving device that moves the holding jig and at least one of the partition wall and the stator core relative to the other in the axial direction of the holding jig.

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