JP2014091863A - Aluminum alloy wire material and enameled wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminum alloy wire material in which the occurence of metal powder is suppressed, and to provide an enameled wire using the aluminum alloy wire material.SOLUTION: The aluminum alloy wire material is produced by adding at least 0.3 wt.% to 1.0 wt.% of iron to pure aluminum having a purity of 99.7% or more. The aluminum alloy wire material has: an electric conductivity of 60% IACS or more; a Vickers hardness of 50 Hv or more; and an elongation of 3% or more.

Description

  The present invention relates to an aluminum alloy wire and an enameled wire using the aluminum alloy wire.

  In recent years, automobiles that do not rely on oil as much as possible have been actively developed because of concerns about global warming and resource depletion. Examples of such vehicles include an electric vehicle (EV) and a hybrid electric vehicle (HEV). In such a motor (coil) mounted on an automobile, an enameled wire using a copper wire as a conductor is mainly used from the viewpoint of conductivity and strength (mechanical strength).

  Such automobiles are required to increase the distance traveled by one charge or one refueling. One effective means of increasing the travel distance is to reduce the weight of the vehicle body. In order to reduce the weight of the vehicle body, it is required to reduce the weight of the enamel wire used in the motor.

  For this reason, an enameled wire using a pure aluminum wire as a conductor has been proposed. The specific gravity of pure aluminum is 1/3 or less of the specific gravity of copper. Therefore, the pure aluminum wire is lighter than the copper wire. On the other hand, the conductivity of the pure aluminum wire is lower than the conductivity of the copper wire, and is about two-thirds of the conductivity of the copper wire. Therefore, when the same amount of current as the copper wire is passed through the pure aluminum wire (when the resistance of the pure aluminum wire is the same as the resistance of the copper wire), the cross-sectional area of the pure aluminum wire is about It needs to be 1.5 times. Even if the cross-sectional area of the pure aluminum wire is about 1.5 times the cross-sectional area of the copper wire, the weight of the pure aluminum wire is about half the weight of the copper wire having the same resistance. Therefore, the enameled wire can be reduced in weight.

  However, a pure aluminum wire has a problem that it has a lower strength (mechanical strength) than a copper wire and is soft. For this reason, the surface of the pure aluminum wire may be rubbed, and the surface of the pure aluminum wire may be damaged. That is, for example, when a pure aluminum wire drawn by a drawing die or the like is wound by a winder such as a capstan, a slip may occur, and the surface of the pure aluminum wire may be damaged. As a result, aluminum metal powder (hereinafter, also simply referred to as “metal powder”) was generated on the surface of the pure aluminum wire and sometimes adhered. An enameled wire manufactured using a pure aluminum wire in which such metal powder is generated may have a reduced breakdown voltage. That is, the insulation performance may be reduced.

  Further, when a pure aluminum wire is drawn using a wire drawing machine such as a wire drawing die, the metal powder on the surface of the pure aluminum wire may be strongly pressed against the pure aluminum wire by the wire drawing machine. Thereby, the metal powder adhering to the surface of the pure aluminum wire may be embedded in the surface of the pure aluminum wire. Therefore, it may be difficult to remove the metal powder from the surface of the pure aluminum wire.

  Moreover, the metal powder adhering to the surface of the pure aluminum wire sometimes peeled off in the wire drawing machine. As a result, the metal powder may clog the wire drawing machine, and the pure aluminum wire may be disconnected. When the pure aluminum wire was disconnected, metal powder was sometimes generated.

  In addition, for example, in an enameled wire manufacturing process for forming an enameled wire by forming an insulating film by applying an insulating paint to a pure aluminum wire, metal powder adhered to the surface of the pure aluminum wire may be peeled off. . That is, the metal powder may be peeled off from the pure aluminum wire due to vibration when the pure aluminum wire is conveyed. In addition, the metal powder may be peeled off from the pure aluminum wire even when the pure aluminum wire is bent or rubbed by a roll such as a guide roll in the enamel wire manufacturing process. In some cases, the metal powder peeled off from the pure aluminum wire is mixed into the insulating paint in the applicator provided in the enamel wire manufacturing process. Since the metal powder has conductivity, when the metal powder is mixed into the insulating paint, the insulating performance of the insulating coating may be deteriorated.

  Moreover, since pure aluminum wire has low strength as described above, it is soft. For this reason, the enameled wire using a pure aluminum wire as a conductor may have a low tensile strength. Therefore, the enameled wire may be stretched when the enameled wire is molded, for example, for automobiles or electrical equipment. That is, the insulating coating provided in the enameled wire may be stretched. When the insulating film is extended, the insulating performance (dielectric breakdown voltage) may be lowered.

  Therefore, for example, 0.2 to 1.0% by weight of iron (Fe) and 0.01 to 0.10% by weight of zirconium (Zr) are added to pure aluminum having a purity of 99.95% or more. There has been proposed an aluminum alloy wire using such an aluminum alloy (see, for example, Patent Document 1). For example, as an aluminum alloy wire, there is a technique of using an aluminum alloy obtained by adding appropriate amounts of magnesium (Mg), Fe, and rare earth elements to aluminum. Such an aluminum alloy wire is given moderate strength and elongation as compared with a pure aluminum wire. Thereby, generation | occurrence | production and disconnection of the metal powder by intensity | strength lack are suppressed.

Japanese Patent No. 3867636

  However, further weight reduction of enameled wire is required. For this reason, it is considered to make the diameter of the aluminum alloy wire thinner (for example, make the diameter 0.32 mm or less). Aluminum alloy wire has higher strength and elongation than pure aluminum alloy wire, but lower strength and elongation than copper wire. Therefore, when the diameter of the aluminum alloy wire is drawn to 0.32 mm or less using a wire drawing machine, there is a problem that the aluminum alloy wire is easily broken.

  In order to prevent disconnection of the aluminum alloy wire during wire drawing, it is conceivable to reduce the wire drawing speed of the wire drawing machine. However, if the wire drawing speed of the wire drawing machine is slowed down, the productivity is lowered. On the other hand, even if the wire drawing speed is reduced, the energy consumption of the wire drawing machine does not decrease in proportion to the wire drawing speed. Therefore, if the wire drawing speed is slowed down, the amount of energy used per production volume increases, which may go against energy savings and increase manufacturing costs.

  Therefore, it is considered to prevent disconnection during wire drawing by using a water-soluble lubricating oil having a low viscosity as the lubricating oil when the aluminum alloy wire is drawn. However, as described above, the aluminum alloy wire has a low strength and is soft. For this reason, if a water-soluble lubricating oil having a low viscosity, that is, a lubricating oil with low lubricity is used, slip occurs when the aluminum alloy wire drawn by the wire drawing machine is wound on the winder, and aluminum In some cases, metal powder was generated on the surface of the alloy wire.

  Then, an object of this invention is to provide the aluminum alloy wire which solves the said subject and suppresses generation | occurrence | production of metal powder, and the enamel wire using this aluminum alloy wire.

In order to solve the above problems, the present invention is configured as follows.
According to the first aspect of the present invention, at least iron is added to 0.3% by weight or more and 1.0% by weight or less to pure aluminum having a purity of 99.7% or more, and the conductivity is 60% IACS or more. An aluminum alloy wire having a Vickers hardness of 50 Hv or more and an elongation of 3% or more is provided.

  According to the second aspect of the present invention, there is provided the aluminum alloy wire according to the first aspect having a diameter of 0.32 mm or less.

  According to a third aspect of the present invention, an enamel comprising: a conductor composed of the aluminum alloy wire according to the first or second aspect; and an insulating film formed so as to cover the periphery of the conductor. A line is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the enamel wire using the aluminum alloy wire which this generation | occurrence | production of metal powder is suppressed, and this aluminum alloy wire can be obtained.

  Below, one embodiment of the aluminum alloy wire and enamel wire concerning the present invention is described.

(1) Aluminum alloy wire First, the aluminum alloy wire concerning this embodiment is explained.

  The aluminum alloy wire according to the present embodiment is formed using an aluminum alloy using pure aluminum (Al) having a purity of 99.7% or more as a base material. Thereby, favorable electroconductivity (electric conductivity) is obtained for the aluminum alloy wire. Aluminum has a lower specific gravity than copper. Accordingly, the aluminum alloy wire is lighter than the copper wire.

  In an aluminum alloy using pure aluminum as a base material, iron (Fe) is 0.3 wt% or more and 1.0 wt% or less, preferably 0.3 wt% or more and 0.7 wt% or less, more preferably 0.3 to 0.6% by weight is added. The aluminum alloy may contain 0.05% by weight or less of inevitable impurities. Thereby, the mechanical strength and elongation of the aluminum alloy wire can be improved. That is, the aluminum alloy wire has excellent mechanical strength and elongation compared to an aluminum wire (pure aluminum wire) formed of aluminum (pure aluminum). Therefore, for example, it is possible to suppress the surface of the aluminum alloy wire from being rubbed and scratching the surface of the pure aluminum wire in the wire drawing step described later. As a result, the aluminum alloy wire can suppress the generation of metal powder.

  In the present embodiment, the amount of elements (Fe, inevitable impurities, etc.) other than aluminum (Al) contained in the aluminum alloy is a little more than 1% by weight at the maximum. Thereby, the aluminum alloy wire can maintain the same specific gravity and conductivity as pure aluminum while improving the mechanical strength and elongation.

  Specifically, the aluminum alloy wire according to the present embodiment can have a conductivity of 60% IACS or more, a Vickers hardness of 50 Hv or more, and an elongation of 3% or more.

  In addition, when the addition amount of Fe is less than 0.3% by weight, the Vickers hardness (mechanical strength) and elongation of the aluminum alloy wire may decrease. On the other hand, when the added amount of Fe exceeds 1.0% by weight, the conductivity of the aluminum alloy wire may be lowered.

  The aluminum alloy wire can be a fine wire having a diameter of 0.32 mm or less (for example, a diameter of 0.25 mm). As described above, since the aluminum alloy wire has good conductivity, a desired current capacity can be maintained even with such a thin wire. Further, as described above, the aluminum alloy wire has excellent mechanical strength and elongation. Therefore, even such a thin wire can satisfy the mechanical strength and tensile strength desired by the enameled wire described later. Moreover, an aluminum alloy wire can be made lighter by making an aluminum alloy wire into a thin wire.

(2) Enameled wire Next, the enameled wire using the above-mentioned aluminum alloy wire will be described. The enameled wire according to the present embodiment is configured to include a conductor formed of the above-described aluminum alloy wire and an insulating film formed so as to cover the periphery of the conductor. The insulating coating is formed by applying an insulating paint around the aluminum alloy wire as a conductor. As the insulating paint, for example, polyester, polyamideimide, polyimide, or the like can be used.

  An enameled wire using such an aluminum alloy wire is lighter than an enameled wire using, for example, a copper wire as a conductor. Further, as described above, the aluminum alloy wire can suppress the generation of metal powder (aluminum alloy powder). Therefore, when the aluminum alloy wire is coated with the insulating paint, it is possible to prevent the metal powder as the conductor from being peeled off and mixed into the insulating paint. Therefore, it can suppress that the insulation performance (for example, dielectric breakdown voltage etc.) of an enamel wire (insulation film) falls. Moreover, the aluminum alloy wire has an excellent elongation. Therefore, the enameled wire formed using such an aluminum alloy wire has an excellent tensile strength (tensile strength). As a result, a decrease in the insulation performance of the enameled wire can be further suppressed.

(3) Enamel Wire Manufacturing Method Next, an embodiment of the enamel wire manufacturing method according to an embodiment of the present invention will be described.

(Aluminum alloy casting process)
In the enameled wire manufacturing method according to the present embodiment, an aluminum alloy ingot having the above composition is first cast. That is, first, 0.3 wt% or more and 1.0 wt% or less of Fe are added to a pure aluminum melt having a purity of 99.7% or more to prepare a molten aluminum alloy. The molten aluminum alloy is poured into a mold to form a cast body (ingot) having a predetermined shape.

(Drawing process)
Thereafter, the cast body is rolled by, for example, a continuous casting and rolling method until the cast body has a predetermined diameter, and an aluminum alloy rolled wire is formed (rolling step). After the rolling step is completed, cold drawing is performed until the rolled wire has a predetermined diameter (for example, 0.32 mm or less) by, for example, drawing with a wire drawing die using a slip-type continuous wire drawing machine. A wire is formed (cold drawing process). And until the aluminum alloy wire finally has a desired wire diameter (for example, 0.32 mm or less), the rolling process and the cold wire drawing process are performed once, or the rolling process and the cold wire drawing are performed once. Each process is repeated a predetermined number of times. Thereby, the aluminum alloy wire concerning this embodiment is manufactured.

  In the wire drawing step, for example, a water-soluble lubricating oil having a low viscosity used when a copper wire is drawn may be used as the lubricating oil. As such a lubricating oil, for example, a water-soluble lubricating oil obtained by diluting Lubrite (registered trademark) model number 2000 manufactured by Japan Oil Research Laboratories with water to 5% can be used.

(Enamel wire manufacturing process)
The aluminum alloy wire drawn by the wire drawing step is annealed (heat treatment) by heating at a predetermined temperature for a predetermined time (annealing step). The annealing may be batch annealing or continuous annealing.

  An insulating paint is applied so as to cover the periphery of the aluminum alloy wire after the annealing process (painting process). As the insulating paint, for example, polyester, polyamideimide, polyimide, or the like can be used. Thereafter, an insulating paint is baked to form an insulating film around the conductor. As a result, an enameled wire in which an aluminum alloy wire is used as a conductor and an insulating film is formed around the conductor is manufactured.

(4) Effects According to the Present Embodiment According to the present embodiment, one or more effects described below are exhibited.

(A) According to the present embodiment, pure aluminum having a purity of 99.7% or more is used as the base material of the aluminum alloy forming the aluminum alloy wire. Thereby, an aluminum alloy wire can be reduced in weight. Therefore, the enameled wire in which this aluminum alloy is used as a conductor can be reduced in weight. And when such an enameled wire is applied to apparatuses, such as a vehicle-mounted monitor, the weight ratio of the enameled wire to the whole apparatus can be made small. That is, the weight of the device can be reduced. As a result, the energy efficiency of the apparatus can be improved.

(B) According to the present embodiment, at least iron (Fe) is added to 0.3% by weight or more and 1.0% by weight or less to pure aluminum having a purity of 99.7% or more. Thereby, the aluminum alloy wire can improve mechanical strength and elongation. That is, the Vickers hardness of the aluminum alloy wire can be 50 Hv or more, and the elongation can be 3% or more. Therefore, for example, when the aluminum alloy wire is wound by a winder such as a capstan, it is possible to suppress the surface of the aluminum wire from being rubbed and scratching the surface of the aluminum alloy wire. As a result, it can suppress that metal powder generate | occur | produces and adheres to an aluminum alloy wire.

  (C) According to this embodiment, generation | occurrence | production of the metal powder of an aluminum alloy wire is suppressed. Thereby, the metal powder adhering to the aluminum alloy wire can be prevented from being peeled off inside, for example, a wire drawing die, and clogging of the wire drawing die, for example. Therefore, in the manufacturing process (for example, a wire drawing process or a coating process) of an aluminum alloy wire, the aluminum alloy wire can suppress disconnection, and generation of metal powder due to disconnection can be suppressed. Moreover, since generation | occurrence | production of the disconnection of an aluminum alloy wire is suppressed, without slowing a wire drawing speed, the operation rate of manufacturing equipment can be improved and productivity can be improved. As a result, the manufacturing cost of the aluminum alloy wire can be reduced.

(D) According to the present embodiment, the amount of elements other than aluminum (Al) contained in the aluminum alloy is set to 1% by weight at the maximum. Thereby, the aluminum alloy wire can maintain the same specific gravity and good electrical conductivity as a pure aluminum wire, improving mechanical strength and elongation. That is, the aluminum alloy wire has a Vickers hardness of 50 Hv or more, an elongation of 3% or more, is lightweight, and has a good conductivity of 60% IACS or more.

(E) According to this embodiment, the aluminum alloy wire has a good electrical conductivity of 60% IACS or higher. Therefore, when the resistance of the enameled wire in which the aluminum alloy wire is used as a conductor and the resistance of the enameled wire in which a copper wire is used as the conductor, for example, the weight of the enameled wire using the aluminum alloy wire is It becomes about half of the weight of enameled wire using copper wire. That is, the enameled wire can be made lighter.

(F) According to this embodiment, since the aluminum alloy wire has good conductivity, energy loss associated with generation of Joule heat is reduced. Therefore, when an enameled wire in which an aluminum alloy wire is used as a conductor is applied to a device such as an on-vehicle monitor, energy efficiency can be improved.

(G) According to this embodiment, the diameter of the aluminum alloy wire can be set to 0.32 mm or less. That is, since the aluminum alloy wire has good conductivity, a desired current capacity can be maintained even with such a thin wire. In addition, the aluminum alloy wire has excellent mechanical strength and elongation. Therefore, even with such a thin wire, the mechanical strength of the enameled wire can be satisfied. Moreover, even if it is such a thin wire | line, it can suppress that metal powder generate | occur | produces on the surface of an aluminum alloy wire. Moreover, an aluminum alloy wire can be made lighter by making an aluminum alloy wire into a thin wire.

  Further, when the aluminum alloy wire having the above-mentioned diameter of 0.32 mm or less is used as the conductor, the diameter of the enameled wire can be reduced. Therefore, when such an enameled wire is applied to a device such as an in-vehicle monitor, the volume of the enameled wire occupying the entire device can be reduced. As a result, the volume of the apparatus can be reduced.

(H) According to the present embodiment, the enameled wire includes the conductor formed of the above-described aluminum alloy wire and the insulating coating formed so as to cover the periphery of the conductor. Thereby, the fall of the insulation performance of an enameled wire can be suppressed. That is, by using an aluminum alloy wire that suppresses the generation of metal powder as a conductor, it is possible to prevent the metal powder from being mixed into the insulating paint when an insulating coating is formed on the conductor.

  Further, if the thickness of the insulating coating is the same, the enameled wire with higher tensile strength has a better insulating performance. An enameled wire using the above-described aluminum alloy as a conductor has an excellent tensile strength. Therefore, the enameled wire according to the present embodiment can further suppress a decrease in insulation performance.

  Next, examples of the present invention will be described, but the present invention is not limited to these examples.

(Evaluation of aluminum alloy wire)
Example 1
In Example 1, a pure aluminum (Al) having a purity of 99.7% is used as a base material, and an ingot having a predetermined shape is cast using an aluminum alloy in which Fe is added in an amount of 0.3% by weight. did. This ingot was rolled by a continuous casting and rolling method (propelty method) until the diameter became 8 mm to produce a rolled wire. Subsequently, using a slip-type continuous wire drawing machine, cold drawing was performed on the rolled wire until the diameter became 0.9 mm. In rolling and cold wire drawing, a water-soluble lubricating oil obtained by diluting Lubrite (registered trademark) model number 2000 manufactured by Nippon Oil Research Laboratory Co., Ltd. to 5% with water was used as the lubricating oil. Thereafter, the above rolling and cold drawing were performed a predetermined number of times to produce an aluminum alloy wire having a diameter of 0.25 mm. This was used as the sample of Example 1.

(Example 2)
In Example 2, an ingot having a predetermined shape was cast using an aluminum alloy in which pure aluminum (Al) having a purity of 99.7% was used as a base material and 0.6% by weight of Fe was added to the base material. . Otherwise, in the same manner as in Example 1 above, an aluminum alloy wire having a diameter of 0.25 mm was manufactured. This was used as the sample of Example 2.

(Comparative Example 1)
In Comparative Example 1, a tough pitch copper ingot was cast. And the ingot of tough pitch copper was rolled by the continuous casting rolling system (SCR system) until the diameter became 8 mm, and the rolled wire rod was manufactured. Other than that, a copper wire having a diameter of 0.195 mm was manufactured in the same manner as in Example 1 described above. This was used as a sample of Comparative Example 1.

(Comparative Example 2)
In Comparative Example 2, an ingot having a predetermined shape was cast using pure aluminum having a purity of 99.7%. Other than that, a pure aluminum wire having a diameter of 0.25 mm was manufactured in the same manner as in Example 1 described above. This was used as a sample of Comparative Example 2.

(Comparative Example 3)
In Comparative Example 3, pure aluminum (Al) having a purity of 99.7% was used as a base material. In this base material, 0.23% by weight of Fe, 0.11% by weight of magnesium (Mg), and silicon (Si ) And 0.03 wt% of antimony (Sb) were added to cast an ingot of a predetermined shape. Otherwise, in the same manner as in Example 1 above, an aluminum alloy wire having a diameter of 0.25 mm was manufactured. This was used as the sample of Comparative Example 3.

  About each sample of these Examples 1-2 and Comparative Examples 1-3, the generation amount of the metal powder was measured and evaluated. The amount of metal powder generated was measured by the following method. That is, first, each sample of Examples 1-2 and Comparative Examples 1-3 was cut into a certain length. Next, the surface of each cut sample was wiped with a test paper. Thereafter, the weight of the test paper after wiping was measured. And the weight difference of the test paper before and after wiping was regarded as the amount of metal powder generated in each sample. The amount of metal powder generated was evaluated based on the weight ratio of metal residue when the amount of metal powder generated in the sample of Comparative Example 2 (pure aluminum alloy wire) was 100%.

  Here, the metal powder which generate | occur | produces on the surface of each sample of Examples 1-2 and Comparative Example 3 is a metal powder of an aluminum alloy. The metal powder generated on the surface of the sample of Comparative Example 1 is copper powder. The metal powder generated on the surface of the sample of Comparative Example 2 is aluminum (pure aluminum) metal powder.

  Moreover, the Vickers hardness and elongation were measured about each sample of the above-mentioned Examples 1-2 and Comparative Examples 1-3, respectively. Table 1 collectively shows the measurement results of the generation amount of metal powder, Vickers hardness, and elongation of each sample of Examples 1-2 and Comparative Examples 1-3 described above.

  From Table 1, it can confirm that generation | occurrence | production of metal powder is suppressed compared with the sample of Example 1 and Example 2 compared with the sample of Comparative Example 2. Moreover, it can be confirmed that the samples of Example 1 and Example 2 have improved Vickers hardness and elongation as compared with the sample of Comparative Example 2. That is, it can be confirmed that the Vickers hardness is 50 Hv or more and the elongation is 3% or more. As described above, in the aluminum alloy wire according to the example of the present invention, the mechanical strength and the elongation are improved as compared with the pure aluminum wire by adopting a suitable setting of the composition described in the above embodiment. It can be confirmed that the generation of metal powder is suppressed.

  On the other hand, in the sample of Comparative Example 1, it can be confirmed that the elongation is 2% below the target value, and in the sample of Comparative Example 3, the elongation is 1% below the target value. Moreover, in the sample of the comparative example 3, it can confirm that there is much generation amount of metal powder.

(Evaluation of enameled wire)
Next, an insulating coating was provided around the aluminum alloy wire, the copper wire, and the aluminum wire to produce samples of Examples 3 to 4 and Comparative Examples 4 to 6 that were enamel wires. Then, the conductivity, weight and tensile strength of each enamel wire were evaluated.

(Example 3)
In Example 3, the aluminum alloy wire manufactured in Example 1 was used as a conductor. This conductor was heated and annealed. And the polyamide imide insulation coating (Hitachi Chemical Industry Co., Ltd. model number HI-404-30) was apply | coated so that the circumference | surroundings of the annealed conductor might be coat | covered. Thereafter, an insulating paint was baked to form an insulating film having a thickness of 0.014 mm around the conductor, and an enameled wire was manufactured. This was used as the sample of Example 3.

(Example 4 and Comparative Examples 4 to 6)
In Example 4, the aluminum alloy wire manufactured in Example 2 was used as a conductor. In Comparative Example 4, the copper wire manufactured in Comparative Example 1 was used as a conductor. In Comparative Example 5, the aluminum wire manufactured in Comparative Example 2 was used as a conductor. In Comparative Example 6, the aluminum alloy wire manufactured in Comparative Example 3 was used as a conductor. Otherwise, an enameled wire was produced in the same manner as in Example 3 above. These were used as samples of Example 4 and Comparative Examples 4 to 6, respectively.

  About each sample of these Examples 3-4 and Comparative Examples 4-6, insulation performance, electroconductivity, a weight, and a tensile strength were measured and evaluated. These measurement results are collectively shown in Table 2.

  The insulation performance was evaluated by measuring the dielectric breakdown voltage (kV). That is, each of the samples of Examples 3 to 4 and Comparative Examples 4 to 6 is cut into a certain length, and 100 test pieces are manufactured. Then, each test piece is connected to the electrodes, and AC (50 Hz) is applied between the electrodes in the air, and the voltage is increased in steps of 1 kV / min, and the voltage at which dielectric breakdown occurs is measured. And the average value of each voltage value of 100 test pieces was made into the dielectric breakdown voltage of each sample.

  Moreover, electroconductivity evaluation was performed by measuring the electrical conductivity and conductor resistance of each sample of Examples 3-4 and Comparative Examples 4-6. At this time, the conductivity was measured under the condition of room temperature of 20 ° C. Moreover, the ratio of conductor resistance is a ratio when the conductor resistance value of the enameled wire (Comparative Example 4) manufactured using a copper wire as a conductor is 100%.

  Moreover, weight evaluation was performed by measuring the weight per unit length of each sample of Examples 3-4 and Comparative Examples 4-6. In addition, the ratio in the item of weight evaluation is a ratio when the weight of Comparative Example 4 is 100%.

  Moreover, tensile strength evaluation was performed by measuring the tensile strength of each sample of Examples 3-4 and Comparative Examples 4-6. In addition, the ratio in the item of tensile strength evaluation is a ratio when the tensile strength of Comparative Example 4 is 100%.

  From Table 2, it can be confirmed that the samples of Example 3 and Example 4 are superior in insulation performance, that is, have a high dielectric breakdown voltage, as compared with the sample of Comparative Example 5. As a result, when the insulating paint is formed on the conductor, it can be confirmed that the amount of the metal powder mixed in the insulating paint is small. Moreover, it can confirm that the sample of Example 3 and Example 4 is maintaining the weight and electroconductivity comparable as the sample of the comparative example 5. FIG. In addition, it can be confirmed that the samples of Example 3 and Example 4 are about half as heavy as those of the sample of Comparative Example 4, even though they have the same conductor resistance value. That is, it can be confirmed that the samples of Example 3 and Example 4 are lightweight and have a conductivity of 60% IACS or more and a conductor resistance. In addition, it can be seen that the samples of Example 3 and Example 4 have improved tensile strength compared to the sample of Comparative Example 5.

  On the other hand, it can be confirmed that the sample of Comparative Example 4 is heavy. In the sample of Comparative Example 6, it can be confirmed that the conductivity is low, that is, the conductivity is 58.6% IACS, which is lower than the target value. Further, it can be confirmed that the insulation performance of the sample of Comparative Example 6 is lower than that of the samples of Example 3 and Example 4.

  From the above results, the aluminum alloy wire and the enamel wire according to this example obtained by adding at least 0.3 wt% to 1.0 wt% of iron to pure aluminum having a purity of 99.7% or more are: It was confirmed that the electrical conductivity was 60% IACS or higher, the Vickers hardness was 50Hv or higher, and the elongation was 3% or higher. Moreover, even if the diameter of the aluminum alloy wire was 0.32 mm or less, it was confirmed that the generation of metal powder was suppressed.

  Such an aluminum alloy wire and enameled wire according to an embodiment of the present invention are optimal for use in, for example, electric vehicles and hybrid electric vehicles, and can be expected to reduce the weight of the vehicle body.

Claims (3)

Add at least 0.3 wt% to 1.0 wt% of iron to pure aluminum with a purity of 99.7% or more,
Conductivity is 60% IACS or higher,
Vickers hardness is 50Hv or more,
An aluminum alloy wire characterized by an elongation of 3% or more. The aluminum alloy wire according to claim 1, wherein the diameter is 0.32 mm or less. A conductor composed of the aluminum alloy wire according to claim 1;
An enameled wire comprising: an insulating film formed so as to cover the periphery of the conductor.