KR940008890B1 - Apparatus for magnetizing and making method thereof - Google Patents

Abstract

The apparatus for applying the variable magnetic field, of which direction and magnitude are controlled arbitrarily, to the amorphous toroidal core includes inner and outer vertical wires (2,6) placed around the annealing furnace, and a helical solenoid type wire (8) placed around the outer vertical wire (6). The direction of the currents flowing through vertical wires are opposite to each other so that the magnetic field is applied to the toroidal core stacked between the wires in the direction of cylinder.

Description

Magnetic field application method and apparatus therefor during heat treatment of toroidal core

Figure 1 shows a magnetic field applying method and an example during heat treatment of the toroidal core according to the present invention, (a) is a perspective view thereof, (b) is a planar cross-sectional view along the line I-I of (a).

* Explanation of symbols for main parts of the name

1: magnetic field applying device of toroidal core 2: internal vertical lead wire

4: toroidal core 5: external vertical lead

8: Solenoid Wire

The present invention relates to a method of applying a magnetic field during a heat treatment of a toroidal core used as a magnetic core, and a device thereof, that is, a toroidal core made of an amorphous alloy during heat treatment, regardless of its composition, to apply the magnetic field intensity and direction to an electric signal. The present invention relates to a method and an apparatus for preventing static or rotating magnetic fields in a large amount of cores at one time while being arbitrarily changed.

In general, the amorphous magnetic core, i.e., the core, has a higher permeability, squareness, low iron loss, and coercive force, compared to permalloy and ferrite, which are used as saturation reactors and electromagnetic interference (EMI) countermeasures of the conventional switching regulators. Eggplant has recently attracted attention as a material. Amorphous alloys are generally prepared by quenching a molten alloy of a predetermined composition at a cooling rate of 10 ⁵ ° C / sec or more, and thus there is residual stress in the material, so that it is difficult to obtain excellent soft magnetic properties in the amorphous manufacturing state. Therefore, annealing heat treatment for stress removal is performed at a suitable temperature below the crystallization temperature (Tx) to remove residual stress. However, at the time of heat treatment, a local magnetic anisotropy is formed inside the amorphous material below the Curie temperature (Tc), causing a problem of deterioration of magnetic properties. In order to solve this problem, after annealing heat treatment at a temperature above the Curie temperature and below the crystallization temperature, the cooling rate is corrected and cooled to room temperature or the heat treatment is applied while applying a magnetic field to the magnetic core. In particular, when heat treatment is applied while applying a magnetic field, it is possible to form magnetic domains in a certain direction, thereby increasing permeability, reducing coercive force and iron loss, and thus obtaining excellent soft magnetic properties. However, in the toroidal core, the magnetic field application needs to be applied in the circumferential direction of the core, which makes it difficult to apply the magnetic field. Conventionally, windings are made on a toroidal core, or as disclosed in Japanese Patent Laid-Open Publication No. 59-40503, passing a conductor through the center of the toroidal core and applying a current to the conductor to form a magnetic field in the circumferential direction of the toroidal core. This method is to apply magnetic field or to apply magnetic field by using permanent magnet. These methods are difficult to heat-treat a large number of cores at the same time, and it is difficult to apply isotropic magnetic field to toroidal core due to the problem that a large current must flow through the wire. There is a problem.

In addition, if the magnetic field is applied during heat treatment, the static magnetic properties are improved, but when using high frequency alternating current, it is known that the dynamic magnetic properties are not improved. Is required. Conventionally, the rotating magnet is applied by rotating permanent magnets or rotating cores or wires in order to apply the rotating magnetic field. However, these methods are difficult to apply isotropic magnetic field and the difficulty of mechanical movement during core heat treatment. There is a problem.

The present invention has been made to solve the above drawbacks, and provides an advantage of applying a static or dynamic magnetic field to a large number of cores at one time. In addition, the present invention provides an advantage of having dynamic magnetic properties of the toroidal core during heat treatment even without installing a separate mechanical motion device. In addition, it provides the advantage of applying the required magnetic field to the core during heat treatment even by flowing a small current, and easily induces the magnetic field in the inclination angle (θ) direction, which is a vector sum of the circumferential magnetic field and the vertical magnetic field. In providing an advantage that is formed.

That is, the present invention is a means for achieving the above object, in the method of applying the magnetic field during the heat treatment of the toroidal core, while placing several inner and outer vertical conducting lines inside the heat treatment furnace, Toroidal cores arranged in a stacked state between inner and outer vertical conductors by arranging spiral solenoid conductors outside the arranged outer vertical conductors and applying opposite currents through the respective inner and outer vertical conductors. Is a method of applying a magnetic field during heat treatment of a toroidal core in which magnetic fields are applied in the circumferential direction, respectively.

In addition, several internal and external vertical conductors are arranged at a predetermined distance inside the heat treatment furnace, and spiral solenoid conductors are disposed outside the external vertical conductors arranged in a circular shape, and stacked between internal and external vertical conductors. The toroidal cores, which are arranged several times, are a magnetic field applying device during heat treatment of the toroidal core, which is subjected to a magnetic field by a current applied to the conductor.

The above and other features and advantages will become more apparent from the embodiments according to the accompanying drawings.

The present invention is in no way limited by the following examples.

Figure 1 shows an example of a device (1) for implementing the magnetic field applying method of the core according to the present invention installed in the heat treatment furnace, the heat treatment furnace of the general structure has been omitted, and only the magnetic field applying device of the core in detail.

As shown in FIG. 1, the magnetic field applying device 1 arranges several vertical conducting wires 2 in a circle inside the toroidal core 4, which has been subjected to a heat treatment, and the internal vertical conducting wires 2 The outer vertical conductors 6 are arranged outside, and the spiral solenoid conductors 8 are arranged outside the external vertical conductors 6, and the inner and outer vertical lines 2, 6, Alternatively, by applying a current to any one of the solenoid conductive wires 8 or the inner and outer vertical planes 2 and 6 and the solenoid conductive wires 8, a large amount of toroidal cores 4 can be placed at a time in a desired direction. A magnetic field of magnitude can be applied.

In the drawing according to the above embodiment, only the solenoid wire 8 is installed outside the external vertical wire 6, but is shown as an example. Alternatively, the solenoid wire 8 is inside the external vertical wire 6, i.e., the toro. The magnetic field having the same effect as in the above-described embodiment can also be applied to the toroidal core 4 by arranging it between the core 4 and the outer vertical lead 6.

The number of the toroidal cores 4 is arbitrarily determined according to the height of the inner and outer vertical degrees (2) and 6 corresponding to the size of the heat treatment furnace.

In addition, the magnetic field is applied to the toroidal core 4 during the heat treatment of the core 4 or at the temperature rise and the cooling before and after the heat treatment, and the magnetic field is applied to the outside of the external vertical conductor 6 by the solenoid type conductor 8. In the case where the toroidal core 4 is placed between the inner and outer vertical conductors 2 and 6, the solenoid conductor 8 is located inside the outer vertical conductor 6 The toroidal core 4 is executed in a state located between the solenoid conductive line 8 and the internal vertical lead 2.

Since the heat treatment method of the core is a generalized technique, a detailed description thereof will be omitted in this embodiment. Next, the application of the magnetic field of the toroidal core 4 will be described in detail.

Example 1

Magnetically circumferentially to the toroidal core

As shown in FIG. 1, when the toroidal core 4 is subjected to an opposite current to the inner vertical conductors 2 and the outer vertical conductors 6 during the heat treatment in the heat treatment furnace, the toroidal core 4 has a circumferential direction. In (a) the magnetic field is applied. At this time, the magnitude and direction of the magnetic field applied to each of the cores can be arbitrarily changed by changing the intensity and direction of the current flowing in the inner and outer vertical degrees (2) (6).

Example 2

Magnetic field perpendicular to toroidal core

If a current is applied only to the solenoid conductor 8 without applying a current to the inner and outer vertical planes (2) and (6), it is in a direction parallel to the inner and outer vertical planes (2) and (6), that is, a vertical direction (b). The magnetic field is induced. At this time, the induced magnetic field size and direction can also be arbitrarily changed by changing the magnitude and direction of the current applied to the solenoid lead 8 as in the first embodiment.

Example 3

Magnetic field applied to the toroidal core in the inclination angle (θ) direction

When a current is simultaneously applied to the inner and outer vertical planes (2) and (6) and the solenoid wires (8), the magnetic core applied to the toroidal core (4) results in the vertical direction (generated by the solenoid wires (8). b) the magnetic field and the magnetic field in the inclined direction (c), forming an angle (θ) with the toroidal core (4) by the vector sum of the magnetic field and the circumferential direction (a) generated in the internal and external perpendicularity (2) (6) This is induced. Here, the inclination angle θ of the magnetic field can be arbitrarily adjusted from 0 to 360 ° by adjusting the intensity and direction of the current applied to the inner and outer vertical degrees (2) and (6), and the size is also adjustable. In addition, the magnitude and direction of the magnetic field applied to the toroidal core 4 by changing the magnitude and direction of the current flowing through the inner and outer vertical conductors 2 and 6 or the current flowing through the solenoid conductor 8 with time. By changing the direction over time, the effect of the rotating magnetic field can be obtained as an electrical signal without mechanical movement.

In the above embodiment, the magnitude of the magnetic field applied to the toroidal core 4 is expressed as follows.

The strength of the magnetic field in the circumferential direction a of the toroidal core 4 is

Where N is half of the sum of the number of external vertical conductors (6) and the number of internal vertical conductors (2), i is the strength (A) of the current flowing through the vertical conductors, and L is the internal vertical conductors (2) and the external vertical conductors ( 6) The center circumference (cm) between. In addition, the intensity of the magnetic field in the vertical direction (b) generated by the current flowing in the solenoid conductor 8 is

Where N is the number of turns of the solenoid lead 8, i is the current A flowing through the solenoid lead, and L is the length (cm) of the solenoid lead 8.

As a result, the magnitude of the magnetic field applied to the toroidal core 4 and the inclination angle θ are

Is given by

Therefore, the magnitude and direction of the magnetic field applied to the toroidal core 4 depend on the number of internal and external vertical conductors 2 and 6, the number of turns of the solenoid conductor 8, and the strength of the current flowing through the conductors. The descriptions of the above embodiment, which can be arbitrarily changed by replacement, are further demonstrated from the above equation.

As described above, according to the present invention, there is an effect that magnetic field can be applied to a large number of cores at one time, and each conductor is different from the one in which a large current flows through a conventional conductor due to the arrangement of several conductors. Even if a small current is applied, the magnetic field induction can be induced in the core by the same effect as in the conventional art. Also, in the case of applying the rotating magnetic field, there is a difficulty in mechanically rotating either the conventional lead wire or the toroidal core. According to the present invention, the magnetic field can be provided to the toroidal core only by an electrical signal without changing the magnitude of the current by changing the magnitude and direction of the current flowing in the spirally arranged solenoid type conductor or the vertical conductor. There is a special feature.

Claims (7)

In a method of applying a magnetic field during heat treatment of a toroidal core, a plurality of inner and outer vertical conductors (2) and (6) are arranged in a heat treatment furnace, and a spiral outside the outer vertical conductors (6) arranged in a circular shape. Each of the toroidal cores 4 arranged in a stacked state between the inner and outer vertical conductors by arranging solenoid conductors 8 of each other and applying opposite currents through the inner and outer vertical conductors A method of applying a magnetic field during heat treatment of a toroidal core in which a magnetic field is applied in the circumferential direction. 2. A method according to claim 1, wherein the solenoid type conductors (8) are installed between the toroidal core (4) and the external vertical conductors (6) so that a magnetic field is applied to the toroidal core. The magnetic field application method according to claim 1 or 2, wherein a current is applied only to the solenoid lead (8), so that a magnetic field is induced in the toroidal core therein in the vertical direction. The method of claim 1 or 2, wherein a current is applied to the inner and outer vertical conductors and the solenoid conductors together, and the toroidal core is driven by the circumferential magnetic field and the current flowing through the solenoid conductors. A method of causing a magnetic field to be applied in an inclination angle (θ) direction, which is a vector sum with a vertical magnetic field. The method according to claim 1 or 2, wherein the magnitude and direction of the current flowing in at least one of the leads is changed over time so that the magnitude and direction of the magnetic field applied to the toroidal core can be changed. Several inner and outer vertical conductors 2 and 6 are arranged inside the heat treatment furnace, and spiral solenoid conductors 8 are disposed outside the external vertical conductors 6 arranged in a circular shape. The toroidal cores (4), which are stacked several times between the outer vertical conductors, have a magnetic field applied by all of the conductors or by a current applied selectively. 7. The magnetic field applying device according to claim 6, wherein the solenoid type conductor (8) is provided between the external vertical conductor (6) and the toroidal core (4).