Joint device

Abstract

To restrain misalignment when a power line terminal is joined to a stator coil wire.SOLUTION: A joint device includes an ultrasonic horn to be pressed against a power line terminal that is in contact with one end of a coil wire, and an anvil for supporting one end of the coil wire and the power line terminal from the opposite side of the ultrasonic horn. A contact surface of the anvil in contact with the coil wire has a first range in contact with a first side surface of the coil wire, and a second range in contact with a second side surface that is erected with respect to the first range and adjacent to the first side surface of the coil wire. A contact surface of the power line terminal in contact with the coil wire has a third range in contact with a third side surface that is located on the opposite side to the first side of the coil wire, and a fourth range in contact with a fourth side surface that is erected from the third range and located on the opposite side to the second side surface of the coil wire.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The technology disclosed in this specification relates to a joining device for joining a coil wire of a stator, which is a component of a rotating electric machine, to a power line terminal. The rotating electric machine referred to here broadly means a motor driven by electric power, and includes, for example, a DC (direct current) motor, an AC (alternating current) motor, a stepping motor, and a servo motor. [Background technology]

[0002] Patent Document 1 describes a conductor joining method. This conductor joining method is a joining method for joining an end of a coil wire arranged in a motor stator to a power line terminal, in which the portion of the coil wire where the insulating coating has not been peeled off and the power line are clamped, and the coil wire end and the power line terminal are clamped and then welded together, thereby suppressing the occurrence of misalignment between the coil wire end and the power line terminal.

[0003] Patent Document 2 describes an ultrasonic welding device. This ultrasonic welding device simultaneously welds multiple sets of members together. In this device, the members are supported by multiple supports provided on a receiving stand, and an ultrasonic horn located on the opposite side of the receiving stand is pressed against the members. Then, ultrasonic vibrations are applied from the ultrasonic horn to the members, thereby ultrasonically welding the members together. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-118200 A [Patent Document 2] JP 2005-219064 A Summary of the Invention [Problem to be solved by the invention]

[0005] There are arc welding devices and ultrasonic welding devices as joining devices for joining the ends of the coil wires installed in the stator of a motor to the power line terminals. Ultrasonic welding can reduce construction costs compared to arc welding, which uses expensive inert gas, and can reduce the cost of the product. On the other hand, if the joint surface between the end of the coil wire and the power line terminal is inclined with respect to the pressing direction (load direction) of the ultrasonic horn, there is a risk of misalignment between the coil wire and the power line terminal. In this case, for example, the area of ​​the joint surface is reduced, which may reduce the tensile strength of the joint.

[0006] In view of the above, the present specification provides a technique for positioning when ultrasonically joining an end of a coil wire of a stator and a power line terminal. [Means for solving the problem]

[0007] The technology disclosed in this specification is embodied in a joining device that ultrasonically joins one end of a coil wire arranged in a stator of a motor to a power line terminal provided at one end of a power line, and includes an ultrasonic horn that is pressed against the power line terminal that contacts one end of the coil wire, and an anvil that supports the one end of the coil wire and the power line terminal from the opposite side to the ultrasonic horn.

[0008] The contact surface of the anvil that contacts the coil wire has a first area that contacts a first side of the coil wire and a second area that is erected relative to the first area and contacts a second side of the coil wire adjacent to the first side.

[0009] The contact surface of the power line terminal that contacts the coil wire has a third area that contacts a third side surface of the coil wire located opposite the first side surface, and a fourth area that stands up from the third area and contacts a fourth side surface of the coil wire located opposite the second side surface.

[0010] According to the above-mentioned configuration, when one end of the coil wire and the power line terminal are clamped between the ultrasonic horn and the anvil, the anvil contacts the coil wire from two directions, and the power line terminal also contacts the coil wire from two directions facing the anvil. This restricts the positions of the coil wire and the power line terminal not only in the pressing direction (load direction) of the ultrasonic horn, but also in the direction perpendicular to the pressing direction. Therefore, even if the joint surface between them is inclined with respect to the pressing direction (load direction) of the ultrasonic horn, the positional deviation between the two is suppressed. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a diagram illustrating a structure of a stator. [Diagram 2] 2 shows a main part of a joining device according to an embodiment. [Diagram 3] 3 is a cross-sectional view taken along line III-III in FIG. 2 . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The joining device of the embodiment will be described with reference to the drawings. As shown in Fig. 2, the joining device of the embodiment is an apparatus for ultrasonic joining, and joins one end of a coil wire 12 arranged in a stator 2 to a power line terminal 14 provided at one end of a power line (not shown). As an example, the stator 2 in the embodiment is a component of a so-called motor driven by electricity. Note that the configuration described in the embodiment is not limited to DC (direct current) motors, and can be similarly adopted in other types of motors.

[0013] First, the stator 2 will be described with reference to Fig. 1. As shown in Fig. 1, the stator 2 includes a stator core 10 and a coil wire 12. The specific configuration and material of the stator core 10 are not particularly limited. As an example, the stator core 10 in this embodiment has a generally cylindrical shape and is configured by laminating a plurality of silicon steel plates. On the inner peripheral surface of the stator core 10, a plurality of slits extending in the axial direction are arranged along the circumferential direction.

[0014] The coil wire 12 is disposed in the slits of the stator core 10. The coil wire 12 is a so-called segment coil, and is made up of a plurality of conductive wires having a rectangular cross section. As an example, the coil wire 12 in this embodiment is made up of a metal wire such as copper. The coil wire 12 is a three-phase coil wire, and includes three coil wires 12 for U-phase, V-phase, and W-phase. The three coil wires 12 generate a rotating magnetic field in the stator core 10 when a three-phase AC current is passed through them.

[0015] A power line terminal 14 is connected to one end 12a (see FIG. 2) of the coil wire 12. The power line terminal 14 is provided at one end of a power line (not shown). The power line is electrically connected to an external power source and constitutes a current path for passing a current through the coil wire 12. The power line terminal 14 is made of a metal such as copper or aluminum. As an example, the power line terminal 14 in this embodiment is bifurcated and connected to two ends 12a of the coil wire 12 arranged in the circumferential direction. Although one power line terminal 14 is shown in FIG. 1, in reality, there are three power lines and power line terminals 14 for the U phase, V phase, and W phase. The three power line terminals 14 are connected to the three coil wires 12 for the U phase, V phase, and W phase, respectively.

[0016] Next, a joining device of the embodiment will be described with reference to Figures 2 and 3. As described above, the joining device of the embodiment joins the power line terminal 14 to one end 12a of the coil wire 12. One end 12a of the coil wire 12 is not covered with an insulating coating, and the metal (copper) wire is exposed.

[0017] As shown in Fig. 2, the joining device of the embodiment includes an ultrasonic horn 16 and an anvil 18. The ultrasonic horn 16 is connected to an ultrasonic generator and configured to generate ultrasonic vibrations. The ultrasonic horn 16 is pressed against the power line terminal 14 that contacts one end 12a of the coil wire 12. The anvil 18 is disposed so as to support one end 12a of the coil wire 12 and the power line terminal 14 from the opposite side to the ultrasonic horn 16. That is, the one end 12a of the coil wire 12 and the power line terminal 14 are held between the ultrasonic horn 16 and the anvil 18, and joined together by the ultrasonic vibrations applied from the ultrasonic horn 16.

[0018] 3, the contact surface 19 of the anvil 18 that contacts the coil wire 12 has a first area 19a and a second area 19b. The first area 19a of the contact surface 19 contacts the first side surface 13a of the coil wire 12. The second area 19b of the contact surface 19 stands upright relative to the first area 19a and contacts the second side surface 13b of the coil wire 12. The second side surface 13b of the coil wire 12 is adjacent to the first side surface 13a and forms an angle of approximately 90 degrees with respect to the first side surface 13a.

[0019] The contact surface 15 of the power line terminal 14 that contacts the coil wire 12 has a third area 15a and a fourth area 15b. The third area 15a of the contact surface 15 contacts the third side surface 13c of the coil wire 12. The fourth area 15b of the contact surface 15 stands upright from the third area 15a and contacts the fourth side surface 13d of the coil wire 12. The third side surface 13c of the coil wire 12 is a side surface located opposite to the first side surface 13a, and the fourth side surface 13d is a side surface located opposite to the second side surface 13b. The fourth side surface 13d is also a side surface adjacent to the third side surface 13c and forms an angle of approximately 90 degrees with respect to the third side surface 13c.

[0020] According to the configuration of this embodiment, when one end 12a of the coil wire 12 and the power line terminal 14 are clamped between the ultrasonic horn 16 and the anvil 18, the anvil 18 contacts the coil wire 12 from two directions, and the power line terminal 14 also contacts the coil wire 12 from two directions facing the anvil 18. This restricts the positions of the coil wire 12 and the power line terminal 14 not only in the pressing direction (load direction) of the ultrasonic horn 16, but also in the direction perpendicular thereto. This prevents misalignment between the coil wire 12 and the power line terminal 14.

[0021] In particular, in the joining device of this embodiment, the bifurcated power line terminal 14 is ultrasonically joined to two coil wires 12 at the same time. The two coil wires 12 are arranged along the circumferential direction of the stator 2. Therefore, as can be seen from FIG. 3, the joining surface between the coil wire 12 and the power line terminal 14 is not perpendicular to the pressing direction (load direction) of the ultrasonic horn 16, but is inclined. In such a case, when the ultrasonic horn 16 is pressed against the coil wire 12, a positional deviation between the coil wire 12 and the power line terminal 14 has been a problem in the past. However, according to the joining device of this embodiment, the contact surfaces 19, 15 of the anvil 18 and the power line terminal 14 contact the coil wire 12 from two directions, so that the positional deviation between the coil wire 12 and the power line terminal 14 is effectively suppressed. [Explanation of symbols]

[0022] 2: stator, 10: stator core, 12: coil wire, 14: power line, 16: ultrasonic horn, 18: anvil

Claims

[Claim 1] A joining device that ultrasonically joins a power line terminal provided at one end of a power line to one end of a coil wire arranged in a stator, an ultrasonic horn that is pressed against the power line terminal that is in contact with one end of the coil wire; an anvil that supports one end of the coil wire and the power line terminal from the opposite side of the ultrasonic horn; Equipped with a contact surface of the anvil that contacts the coil wire has a first area that contacts a first side surface of the coil wire, and a second area that is erected relative to the first area and contacts a second side surface of the coil wire adjacent to the first side surface, a contact surface of the power line terminal that contacts the coil wire has a third area that contacts a third side surface of the coil wire that is located opposite the first side surface, and a fourth area that stands up from the third area and contacts a fourth side surface of the coil wire that is located opposite the second side surface, Bonding equipment.

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