JPH0636614A - Electrically conductive wire - Google Patents

Abstract

PURPOSE:To provide an electrically conductive wire having a shape memory by processing the wire in such a way that a Ti-Ni shape memory alloy having high shape recoverability and giving a less change with the elapse of time comes to be an outer layer, while a conductive material such as Cu, Al, C and Sn forms a core. CONSTITUTION:An electrically conductive wire is provided by forming an outer layer out of a Ti-Ni shape memory alloy, and a core out of a conductive material such as Cu, Al, C, and Sn. This electrically conductive wire is used as a coil for a rotary core at the outside of a coaxial type rotary transformer. In this case, a pre-deformed winding coil 10 available from the wire processed into a toroidal shape at a temperature equal to or below the martensite transformation temperature of a shape memory alloy, is deformed inward and a winding coil 11 after deformation is inserted in the rotary core. After insertion, a winding coil 12 recovered due to the shape memory alloy at a service environment temperature is obtained. Thus, the winding coil using the wire for the rotary transformer core can be easily fixed to the core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to coils and lead wires for transformers and the like used in home appliances, communications and the like.

[0002]

2. Description of the Related Art It is well known that shape memory alloys such as Ti-Ni alloys have a remarkable shape memory effect in the reverse transformation of martensitic transformation. It is also well known that it has superelasticity at the temperature after reverse transformation. Among shape memory alloys, Ti-Ni alloys are used in a wide range of fields as practical alloys because of their good performance. However, since this alloy has an electric resistance comparable to that of nichrome wire, it generates a large amount of heat when energized and is not suitable for practical use as a conductive wire.

[0003]

Generally, a Cu base line of brass or the like is used for a coil of a transformer or the like. However, the wiring of a coaxial transformer such as a VTR is apt to be deformed at the time of wiring because the storage space is small, which makes it difficult to automate. On the other hand, Cu-Zn-Al alloys and other Cu-based alloys are considered to be used as conductive shape memory alloy wires because of their low electric resistance, but they are not put to practical use in terms of weak shape recovery force and change over time. It has not been. Therefore, the technical problem of the present invention is, in view of the above drawbacks, that the shape recovery force is large,
The purpose is to practically use a shape memory alloy having a small change with time, particularly a Ti—Ni alloy as a conductive wire.

[0004]

According to the present invention, an arbitrary shape can be maintained by using a shape memory alloy as an outer skin and a conductive material such as Cu, Al, C or Sn as an inner core. A conductive wire is obtained. Further, according to the present invention, the shape memory alloy is transformed into a shape that can be easily attached to the conductive wire disposition portion at an environmental temperature equal to or lower than the martensitic transformation temperature, and after the attachment is completed, the alloy is used as a matrix phase at an operating environmental temperature. As a result, a conductive wire that restores the set shape and maintains the shape of the portion is obtained. Further, according to the present invention, a conductive wire characterized in that the outer cover is a Ti-Ni alloy tube can be obtained.

[0005]

Function: Conductive material such as Cu, Al, C, Sn is 0.03
By using a Ti-Ni-based shape memory alloy as an inner core of φmm to 0.07φmm and covering the outer skin with 0.005 mm or more, a conductive wire having good shape memory while having good conductivity can be obtained. It is very difficult to wind the winding coil around the groove of the inner diameter by using this conductive wire, for example, when winding the outer rotor core of the coaxial rotary transformer core. By using it, you can freely transform it in cold water (0 to 5 ° C), insert the winding coil into the groove of the inner diameter, and after mounting it, heat it to room temperature (20 to 25 ° C) It can be restored and the winding coil can be fixed to the coaxial rotary transformer core. It is possible to provide a conductive wire using a shape memory alloy having a large shape recovery force and a small change with time.

[0006]

EXAMPLES Examples will be described in detail below.

[0007]

Example 1 Ti-50.5 obtained by a high frequency melting method
Outside diameter of 3.0φm by hot working and cold working of at% Ni alloy
m, 2.5 dia.
Cu wire of m was inserted into the tube. After that, annealing was repeated every cold working ratio of 30 to 50% to obtain a wire having a diameter of 0.08 mm by drawing. The cross section of the obtained wire is Ti-N
The thickness of the i alloy coating was 0.005 mm, and the diameter of the Cu wire was 0.07 mm. Next, the wires were bundled and processed into a coil shape having a diameter of 3 mm, and heat-treated at 400 ° C for about 1 hour. After that, this wire is deformed in cold water (0 to 5 ° C.), inserted into a bobbin with an inner diameter of 3φ mm, and heated to room temperature (20 to 2
Heated to 5 ° C). The coil has completely recovered its shape and is in close contact with the inner diameter of the bobbin of the transformer. The electric resistance of the coil showed the same value as that of the Cu wire having a diameter of 0.07 mm. The cross section of the obtained wire has a Ti—Ni alloy coating thickness of 0.005 mm and a Cu wire diameter of 0.03 φm.
It was confirmed that the diameter of the Cu wire was 0.03 mm, and the diameter of the Cu wire was 0.03 mm.
Even in the case of m and 0.05 mm, the shape memory property was completely recovered, and the conductivity was as good as the Cu wire having a diameter of 0.07 mm.

[0008]

Example 2 Ti-50.5 obtained by a high frequency melting method
Outside diameter of 3.0φm by hot working and cold working of at% Ni alloy
m, 2.5mm diameter after making a tube with 2.6mm inner diameter
m Al wire was inserted into the tube. After that, the cold working rate was repeatedly annealed at every 30 to 50%, and a wire with a diameter of 0.04 mm was obtained by drawing. The cross section of the obtained wire is Ti
The thickness of the -Ni alloy coating was 0.005 mm, and the diameter of the Al wire was 0.03 mm. Next, the wires were bundled and processed into a coil shape having a diameter of 3 mm, and heat-treated at 400 ° C for about 1 hour. After that, this wire is deformed in cold water (0 to 5 ° C.), inserted into a bobbin with an inner diameter of 3φ mm, and cooled to room temperature (20
~ 25 ° C). The coil has completely recovered its shape and is in close contact with the inner diameter of the bobbin of the transformer. Further, the electric resistance of the coil showed the same value as that of the Al wire having a diameter of 0.03φ mm. The cross section of the obtained wire had a Ti-Ni alloy coating thickness of 0.005 mm and an Al wire diameter of 0.05φ.
In the case of mm, the shape memory property is slightly inferior to the complete recovery and is almost recovered, and the conductivity is 0.05φ in diameter.
The electric resistance was the same as that of the Al wire of mm, which was good. Al
In the case of the wire of 0.07φ mm, almost no recovery of the shape memory was observed, and the conductivity was good, showing the same electric resistance as the diameter of the Al wire of 0.07 φmm, but the diameter of the shape memory was 0. Do not use Al wire of 0.07 mm.

[0009]

Example 3 Ti-50.5 obtained by a high frequency melting method
Outside diameter of 3.0φm by hot working and cold working of at% Ni alloy
m, 2.5mm diameter after making a tube with 2.6mm inner diameter
The C line of m (C electrode rod) was inserted into the tube. After that, the cold working rate was repeatedly annealed at every 30 to 50%, and a wire with a diameter of 0.04 mm was obtained by drawing. The cross section of the obtained wire has a Ti-Ni alloy coating thickness of 0.005 mm,
The diameter of the C wire was 0.03 mm. Next, the wires are bundled and processed into a coil with a diameter of 3 mm, and the temperature is about 1 at 400 ° C.
Heat treated for hours. Then, this line is cold water (0-5
C.), deformed in a bobbin with an inner diameter of 3 mm, and heated to room temperature (20 to 25 ° C.). The coil has completely recovered its shape and is in close contact with the inner diameter of the bobbin of the transformer.
The electric resistance of the coil showed the same value as that of the C wire having a diameter of 0.03 mm. The cross section of the obtained wire had a Ti-Ni alloy coating thickness of 0.005 mm and a C wire diameter of 0.0.
In the case of 5 mm, the shape memory is almost recovered, and the conductivity is as good as the C wire with a diameter of 0.05 mm, and the diameter is 0.0 mm.
It showed the same electric resistance as the C line of 5 mm. When the diameter of the C wire was 0.07φ mm, the shape memory property was hardly recovered, and the conductivity was good, showing the same electric resistance as that of the C wire having the diameter of 0.07 φmm, but the shape memory ability was good. Is 0.07φ
The mm C line is not used. Similar results were obtained with the Al line.

[0010]

Example 4 Ti-50.5 obtained by a high frequency melting method
Outside diameter of 3.0φm by hot working and cold working of at% Ni alloy
m, 2.5mm diameter after making a tube with 2.6mm inner diameter
m Sn wire was inserted into the tube. After that, annealing was repeated every cold working ratio of 30 to 50% to obtain a wire having a diameter of 0.08 mm by drawing. The cross section of the obtained wire is Ti-N
The thickness of the i alloy coating was 0.005 mm and the diameter of the Sn wire was 0.07 mm. Next, the wires were bundled and processed into a coil shape having a diameter of 3 mm, and heat-treated at 400 ° C for about 1 hour. After that, this wire is deformed in cold water (0 to 5 ° C.), inserted into a bobbin with an inner diameter of 3φ mm, and heated to room temperature (20 to 2
Heated to 5 ° C). The coil has completely recovered its shape and is in close contact with the inner diameter of the bobbin of the transformer. The electric resistance of the coil showed the same value as that of the Sn wire having a diameter of 0.07φmm. The cross section of the obtained wire has a Ti-Ni alloy coating thickness of 0.005 mm and a Sn wire diameter of 0.03 mm.
In the case of No. 2, the shape memory property was good with complete recovery, and the conductivity was good with the same electric resistance as the Sn wire having a diameter of 0.03 mm. When the diameter of Sn wire is 0.05φmm, shape memory property is fully recovered and good, and the conductivity is 0.05φmm.
The Sn wire showed the same electric resistance and was good.

The results of Examples 1 to 4 are shown in Table 1 above.

[0012]

[Table 1] The circles in Table 1 are completely recovered, and the triangles are almost recovered (90%
Above), x indicates almost no recovery (recovery of 50% or less).

[0013]

Fifth Embodiment As shown in FIG. 1, a coaxial rotary transformer used in an electronic device such as a VTR is composed of an inner stator core 7 and an outer rotor core 1 and has a number of coils corresponding to the required number of channels. Are provided at opposite positions of each core. As shown in FIG. 2A, the coil of the transformer core of this type is composed of a winding coil 10 before deformation, which is obtained by processing a wire into a toroidal shape. In the inner stator core 7 shown in FIG. 1, there is no particular problem in coil assembly, but in the outer rotor core 1, as shown by the arrow in FIG. The deformed winding coil 11 is inserted into the core. A conductive wire having a shape memory alloy as an outer skin and a conductive material as an inner core is used for this winding coil. That is, at a temperature equal to or lower than the martensitic transformation temperature of the shape memory alloy, as shown by the arrow in FIG. 2B, a part of the wound coil is deformed inward and inserted into the core. After the mounting is completed, the shape memory alloy is used as the mother phase at the operating environment temperature to recover the set shape in the direction of the arrow in FIG. 2C, and the recovered wound coil 12 can be easily fixed. it can. That is, a wire is wound into a toroidal shape and deformed, and the shape memory alloy is used as an outer skin and a conductive wire of the present invention having a conductive material as an inner core is inserted into the core at a use environment temperature. After mounting, by using the shape memory alloy of this conductive wire as the matrix phase at the operating environment temperature,
The wound coil can be fixed and installed very efficiently so as to recover in the direction of the arrow (c) and return to the set shape.

[0014]

As described above, a shape memory alloy, particularly a Ti-Ni alloy is used as a tube-shaped outer cover, and Cu, A
A conductive material such as l, C, or Sn is used as a core material to form a composite material of a shape memory alloy and a conductive material. Using this composite material, the shape memory alloy of the outer shell is transformed into a shape that can be easily mounted at an environmental temperature of the martensitic transformation temperature or lower, and after the mounting is completed, the shape memory alloy is used as a matrix phase at the operating environmental temperature, Restores the set shape. The conductive wire of the present invention is used for a winding coil of a rotor core of a coaxial rotary transformer, a winding coil of an electromagnet, and other transformer coils. The wound coil recovers to the set shape and is fixed, so that the wound coil that is difficult to mount becomes easy to mount, the workability is improved, the shape recovery force that helps improve the yield is large, and the change with time is small. The conductive wire of the memory alloy skin is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a coaxial rotary transformer core.

FIG. 2 is a perspective view of the inventive wound coil of the rotor core outside the coaxial rotary transformer core. 2 (a) is a perspective view of the wound coil before deformation, FIG. 2 (b) is a perspective view of the deformed wound coil, and FIG. 2 (c) is originally a conductive wire using a shape memory alloy. The perspective view of the winding coil which was recovered to the shape.

[Description of Reference Signs] 1 rotor core 7 stator core 8 winding coil of conductive wire using shape memory alloy 9 winding coil of stator core 10 winding coil before deformation 11 winding coil after deformation 12 recovered winding coil

Claims (3)

[Claims] 1. A conductive wire, which has a shape memory alloy as an outer skin and a conductive material as an inner core to maintain an arbitrary shape. 2. The alloy according to claim 1, wherein the shape memory alloy is transformed into a shape that can be easily attached to a conductive wire arranging portion at an ambient temperature of a martensitic transformation temperature or lower, and after the attachment is completed, the alloy is treated at an operating ambient temperature. A conductive wire that recovers to a set shape by maintaining a phase and maintains shape retention for the portion. 3. A conductive wire, wherein the outer cover according to claim 1 is a Ti—Ni alloy tube.