JPH0685627B2 - Method for manufacturing magnetically anisotropic material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a magnetic anisotropic material capable of easily improving the space factor of a magnetic material and easily setting the space ratio of a magnetic material and a conductive material. It relates to a manufacturing method.

[Prior Art] As a magnetic anisotropic conductive material, for example, JP-A-57-46656.
As disclosed in the publication, there are those used for induction motors. 6 (a) and 6 (b) show a magnetic anisotropic conductive material used as a member constituting the rotor of the induction motor, and the rotor has a current-carrying jacket coaxial with the rotating shaft 11.
12 and a rotor core 13 are provided. As shown by the enlarged portion Q, the energizing jacket 12 is mainly composed of a magnetic anisotropic conductive material 16 composed of a magnetic material 14 extending in the radial direction and a conductive material 15 filling the space between them.

With the above configuration, a rotor having a radial magnetic permeability μr larger than the circumferential magnetic permeability μθ (μr> μθ) and a small axial resistivity ρx can be obtained. Here, when this induction motor is driven, magnetic coupling with less magnetic fluctuation is obtained between the stator and the stator due to the large magnetic permeability μr with little variation in the radial direction, and driving with less vibration noise can be performed. Moreover, since the winding is omitted from the rotor, it is possible to reduce the size and weight.

Further, the magnetic permeability and the resistivity can be controlled according to the space factor of the magnetic material and the conductive material.

In this magnetic anisotropic conductive material, for example, a large number of iron wires or steel wires having a predetermined length in the radial direction are radially arranged, and a conductive material such as copper or aluminum is cast between them. It is molded complicatedly.

[Problems to be Solved by the Invention] However, according to the above-described method for producing a magnetic anisotropic conductive material, it is difficult to radially align magnetic materials, and thus the alignment of magnetic materials may be disturbed. Therefore, it is difficult to manufacture a magnetic anisotropic conductive material having a uniform magnetic permeability as a whole, and the arrangement density of magnetic materials is increased to improve the space factor of the magnetic materials (specifically, (For example, if they are packed closely together), not only the gap between the magnetic materials becomes smaller, but sometimes they may come into contact with each other, so that the permeability of the molten conductive material deteriorates and voids occur inside the molded product. However, there is an inconvenience that the characteristics are deteriorated due to the deviation of the magnetic permeability. Therefore, in the conventional manufacturing method, the space factor of the magnetic material is limited to 20 to 30%. Further, in this casting method, there is a problem that the oxidation state of the surface of the steel wire has a great influence on the adhesion, and as a result, the higher the density of the magnetic material made of the iron wire or the steel wire, the more difficult it becomes to cast.

[Means for Solving the Problem] The present invention has been made in view of the above, and it is possible to improve the space factor of the magnetic material and to increase the space factor of the magnetic material and the conductive material without generation of cavities and characteristic deterioration. An object of the present invention is to provide a method of manufacturing a magnetic anisotropic material that can be easily set.

That is, the gist of the present invention is to provide a plurality of clad plates made of a magnetic material plate material and a conductive material plate material, which have been subjected to a large number of slits, by aligning the positions of the slit parts, and laminating a large number of the slit parts to the conductive material. The method for producing a magnetic anisotropic material is characterized in that a plurality of laminated clad plates are integrated by filling with the same molten conductive material as the conductive material.

In the present invention, the clad plate made of a magnetic material plate material and a conductive material plate material, for example, Cu-Fe clad plate,
A two-layer clad plate of Al-Fe clad plate, a Cu-Fe-Cu clad plate, and a three-layer clad plate of Al-Fe-Al clad plate are used.

The planar shape of the clad plate may be disc-shaped, square-plate-shaped, or the like.

Further, as the slit processing, various kinds of slits can be selected depending on the application and use form of the product, such as providing slits in a fixed direction or providing slits radially.

As a method of filling the slit with a conductive material, for example, a conductive material for filling is inserted between clad plates which are preliminarily laminated in the form of a metal film to be replenished, or it is replenished by pouring molten metal. It may be a method.

Then, as a method of filling and integrating the slit portion with a conductive material, for example, a method of heating pressure welding is used, or a method of casting by pouring molten metal of a conductive material (casting method) is performed. Method may be used. However, in this case, in order to obtain a satisfactory filling and integration, it is desirable that the clad plates are superposed so that the slit portions of the clad plates have the same positional relationship for all the clad plates to be laminated.

[Operation] In the method of using the clad plate whose surface is coated with a conductive material in advance, voids do not occur as compared with the conventional casting method, so that the magnetic material and the conductive material are completely adhered to each other. The space factor can be easily set and the space factor of the magnetic material can be increased to 40% or more.

Further, the use of the plate material has an advantage that the directionality of the magnetic material can be freely set depending on the shape and the way of providing the slit portion.

[Example] Next, an example of the magnetic anisotropic material of the present invention will be described with reference to the accompanying drawings.

First, as the clad plate, as shown in FIG.
A circular clad plate of Fe-Cu is used. The dimensions of this material are an outer diameter of 125 and a thickness of 0.5 mm-2.0 mm-05 mm. This clad plate 1 has a width of 1 mm and a length of 30 at intervals of 5 ° as shown in Figs.
The slit 2 of mm is processed.

Then, after the surface treatment for removing the oil content of the clad plate 1, 35 to 37 sheets are laminated so that the slit portions of the respective plates are in the same position as shown in FIG. As shown in FIG. 1, the laminated clad plate layers 8 are put into the mold 4 and fixed by the holding metal fittings 5 and the holding bolts 7.

After that, the surrounding atmosphere is vacuumed or filled with an inert gas so that oxygen is expelled so that the laminated clad plate layers 8 are not oxidized, and preheated by the electric heater 6 to perform casting in the same atmosphere. The preheating temperature is about 1000 to 1050 ° C, which is lower than the melting temperature of the conductive material (Cu = 1083 ° C). When the preheating temperature rises, the same molten metal 3 of copper as the above-mentioned conductive material is poured from between the holding metal fittings 5 above the mold 4. At this time, the molten metal temperature is about 10 to 15% of the melting temperature.
It is poured at a temperature as high as possible, after which the electric heater 6 is turned off, and cooled by water cooling or air cooling from the lower part of the mold to solidify.
After cooling, the cast clad plate layer can be taken out of the mold and finished into a cylindrical shape having a predetermined size and an outer diameter of 120φ, an inner diameter of 80φ, and a length of 100 mm to be used as a magnetic anisotropic material. The space factor of the magnetic material at this time was 43.8%.

Since the molten copper 3 in this case is the same as the so-called brazing filler metal for adhesion, in order to prevent voids from being formed inside the laminated clad plate layers, some molten copper stains are present between the laminated clad plate layers. It is advisable to press the clad plate layer with bolts 7 so that they come out. In this case, the exudation of molten copper is very small because the copper thickness itself is thin, but it also leads to an improvement in the space factor.

On the other hand, in addition to the above-mentioned integration method by pouring molten metal,
When the clad plate is laminated as in the figure, by inserting the Cu foil of a suitable thickness in the clad plates, which placed in the mold 5 in FIG. 1, 7 presser bolts 1 kg / cm ² or more of While applying pressure, the mold temperature was raised to 1083 ° C to 1200 ° C in an oxygen-free atmosphere, the inserted Cu foil and the Cu layer of the clad plate were heated and melted, and then cooled to obtain magnetic anisotropy of a predetermined dimension. Material can also be obtained.

[Effects of the Invention] As described above, according to the method for producing a magnetic anisotropic material of the present invention, a clad material composed of a magnetic material and a conductive material is used as a raw material, so that there is no generation of voids and deterioration of characteristics, and It is possible to manufacture a magnetic anisotropic conductive material in which the space factor of the material is improved, the space ratio of the magnetic material and the conductive material is set, and the direction of magnetism can be easily and freely set by a simple process.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional side view of a casting apparatus for producing a magnetic anisotropic material according to the present invention. FIG. 2 is a perspective view of a clad plate as an embodiment of the present invention, FIG. 3 is a perspective view of an embodiment of a clad plate slit processing used in the present invention, and FIG. 4 is a slit processing of FIG. FIG. 5 is an enlarged view of a portion, FIG. 5 is a perspective view in which the slit clad material of FIG. 2 is laminated, and FIGS. 6 (a) and 6 (b) show a rotor for an induction motor using a magnetic anisotropic material. FIG. 1: Clad plate, 2: Slit, 3: Molten metal, 4: Mold, 5: Press fitting, 6: Heater, 7: Press bolt, 8: Laminated clad plate layers.

Front page continued (72) Inventor Hiroshi Kainuma 1500 Kawajiri-cho, Hitachi, Ibaraki Prefecture, Toraura Plant, Hitachi Cable, Ltd.

Claims (1)

[Claims] 1. A clad plate made of a magnetic material plate material and a conductive material plate material, which has been subjected to a large number of slits, is laminated by aligning the positions of the slit parts, and the slit parts are made of the conductive material. A method for producing a magnetic anisotropic material, characterized in that a plurality of laminated clad plates are integrated by being filled with the same molten conductive material as described above.