JP2679044B2 - Method for manufacturing magnetically anisotropic conductive member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention has the same space factor of a magnetic material and a conductive material at any point, and a magnetic material having a large space factor of a magnetic material. The present invention relates to a method of manufacturing a magnetic anisotropic conductive member used for a squirrel cage rotor of an induction motor, which is capable of manufacturing the anisotropic conductive member without complicating the process and reducing the surface quality. [Prior Art] As a magnetic anisotropic conductive member, for example, JP-A-57-46657.
There is one shown in Japanese Patent Publication No. FIGS. 7A and 7B show the magnetic anisotropic conductive member, which is used for the rotor of the induction motor. That is, the energization jacket 2 is coaxial with the rotating shaft 1.
And a rotor core 3 are provided, and the energization jacket 2 is a magnetic anisotropic conductive member 6 composed of a magnetic material 4 extending in the radial direction and a conductive material 5 filling the space between them, as shown by an enlarged portion Q. The main part is composed. With the above configuration, a rotor having a radial magnetic permeability μ _r larger than the circumferential magnetic permeability μ ^θ (μ _r > μ _θ ) and a small axial resistivity ρ _x can be obtained. When the induction motor is driven, magnetic coupling with less magnetic fluctuation is obtained between the stator and the stator due to the large magnetic permeability μ _{r with} little variation in the radial direction, and driving with less vibration noise can be performed. In addition, since the winding is omitted from the rotor, the size and weight can be reduced. Further, the magnetic permeability and the resistivity can be controlled according to the space factor of the magnetic material and the conductive material. As a method of manufacturing this magnetic anisotropic conductive member, for example,
The ones shown in FIGS. 8 (a) and (b) and FIGS. 9 (a) and (b) have been proposed. FIGS. 8 (a) and 8 (b) show a composite material 13 composed of a magnetic material 11 such as a steel wire and a conductive material 12 such as copper or aluminum covering the outer periphery thereof, and FIG. ) And (b), filling the gap between the composite materials 13 that expands the composite material 13 according to the distance from the center point 0 with a powder 14 of a conductive material such as copper or aluminum, and heating and pressing these. Shows that a ring-shaped magnetic anisotropic conductive member having an inner diameter r and an outer diameter R is manufactured (actually,
The layers shown in FIGS. 9 (a) and 9 (b) will be arranged in multiple layers, but they are omitted in the drawing). According to this method of manufacturing a magnetic anisotropic conductive member, as compared with a manufacturing method in which a conductive material is cast between a magnetic material and a composite material made of a conductive material, the ease of manufacture and the space factor of the magnetic material are reduced. It is possible to improve. [Problems to be Solved by the Invention] However, according to the above-described magnetic anisotropic conductive member, the gap between the composite materials becomes large according to the distance from the center point 0 (Fig. 10 (a)). ), The space factor of the magnetic material differs from that of the conductive material in the radial direction, and the space factor of the magnetic material is limited by the inner peripheral dimension (Fig. 10 (b)). There is an inconvenience that the rate cannot be, for example, 40% or more. Furthermore, according to the manufacturing method, the gap between the composite materials is filled with the powder of the conductive material and then heated and pressed, so that there is a problem in that there is a limit to simplification of the process. [Means for Solving the Problems] The present invention has been made in view of the above, and the space ratios of the magnetic member and the conductive material are the same at any point, and the space ratio of the magnetic material is In order to increase the size of the composite member, a composite member having a large cross-sectional area depending on the distance from the center point 0 is used to simplify the process, and to prevent the deterioration of the surface quality, the composite member is divided into spaces. A method of manufacturing a magnetic anisotropic conductive member used for a squirrel-cage rotor of an induction motor, which is arranged so as not to be aligned and then cold-pressed. That is, the method of manufacturing a magnetic anisotropic conductive member of the present invention comprises the steps of manufacturing a composite member by coating a magnetic member having a cross-sectional area increased from one end to the other end by a linear change in width with a conductive material, Aligning the composite members of the book along a radial line extending from a center point, and arranging the one end of the composite member so as to be adjacent to the center point in a ring shape; and the plurality of composite members arranged in an annular shape. There is a step of forming a hollow cylindrical body in which a large number of the magnetic members are integrated with the conductive material by pressurizing in a cold state in a state where the members are stacked in multiple stages. As described above, in the present invention, since the cold pressurization is adopted, the surface deterioration due to the oxidation can be suppressed as compared with the case where the heat pressurization is adopted. In the following description, as the cold pressurization, the hydrostatic pressurization in which the pressurization condition can be easily set is adopted, but the present invention is not limited to this. Hereinafter, a method for manufacturing the magnetic anisotropic conductive member used in the squirrel cage rotor of the induction motor of the present invention will be described in detail. [Examples] FIGS. 1 (a), (b), and (c) show a composite member 13 used in the present invention, which has a rectangular cross section, and the distance from one end to the other end is different from a center point 0 described later. And a magnetic member 11 such as a steel wire having a large cross-sectional area, and copper coated on the outer periphery thereof,
It is composed of a conductive material 12 such as aluminum, and the above-mentioned change in cross-sectional area does not change one side 1 while the other side changes from l ₁
This is done by increasing l ₂ in direct proportion to the distance from the center point 0. In this case, even if the coating thickness of the conductive material 12 is constant, the cross-sectional area of the conductive material 12 changes according to the change of the outer circumference of the magnetic member 11. FIGS. 2 (a) and 2 (b) show a state in which the composite member 13 is annularly arranged along the radiation extending from the center point 0, and FIGS. 3 (a) and 3 (b) show it in two stages. Then, the cross sections of b ₁ -b ₂ and c ₁ -c ₂ in (a) of FIG. ₂ are shown. Here, since the composite member 13 has the above-described change in cross-sectional area, it can be densely arranged at any point in the radial direction. FIG. 2C shows a magnetic anisotropic conductive member manufactured by the manufacturing method described later, in which the magnetic member 11 is integrated with the conductive material 12. FIG. 4 shows a cold isostatic press for use in the present invention, which includes an upper lid 14 and a lower lid having high pressure oil inlets 14a and 19a.
19 and a high-pressure cylinder 18 that forms a cylindrical space by the upper and lower lids 14 and 19, and the high-pressure liquid 15 of castor oil is present in the cylindrical space. In the above apparatus, the above-mentioned composite members 13 are arranged in a line, for example, 182 per stage, and are laminated in multiple stages so as to have a predetermined height. After putting this in a rubber bag 17 and sealing it with a rubber stopper 16, it is put in the cylindrical space of the cold isostatic press and the high pressure oil inlets 14a and 19a are turned on by a high hydraulic pressure generation pump (not shown). The high-pressure liquid 15 is fed into the cylindrical space through the rubber bag 17 and the entire rubber bag 17 is cold pressed at a pressure of 1500 kg / cm ² or more. As a result, the laminated composite members can be uniformly pressed and integrated. After this pressurization, the pressure is reduced and the integrated composite member 13 is taken out and finished into a predetermined shape and size to obtain a magnetic anisotropic conductive member used in a squirrel cage rotor of an induction motor. 5 (a), (b), and (c) show another embodiment of the present invention, and parts common to those in FIGS. 1 (a), (b), and (c) are common reference numerals. Although it is shown, redundant description will be omitted, but it is different in that the corners of the rectangle have curved surfaces. The curvature of this curved surface may be set to such an extent that a gap is not created between the magnetic members 11 due to plastic deformation of the composite members 13 arranged in a line and stacked in multiple stages and pressed by cold. 6 (a) and (b) are shown in FIG. 1 (a), (b),
An example is shown in which the composite member 13 described in (c) is aligned in a case 30 for poor placement, and after the composite member 13 is aligned in the case 30 outside the mold, the cylindrical space 18 It should be stored in. In this case, the case 30 is made of the same material as the conductive material 12, and the width l of the case 30 is a space.
Designed to fit 18 in 38mm wide. Also, the case
It is preferable that the thickness t of 30 is as thin as possible, so that the reduction of the space factor of the magnetic member 11 can be suppressed. By this method, it is possible to improve the workability of aligning and arranging the composite members 13 and multi-stage stacking. Of course, the workability can be further improved by dividing the case 30 into a plurality of pieces in the circumferential direction. In this case, the end of the composite member is the case 30.
Since it has a shape that smoothly matches with the engaging portion 30a and both ends of the magnetic member 11 are exposed on both sides of the case 30, the magnetic permeability in the radial direction is not affected. [Effects of the Invention] As described above, according to the method of manufacturing the magnetic anisotropic conductive member used for the squirrel cage rotor of the induction motor of the present invention, the cross-sectional areas of the magnetic material and the conductive material are from one end to the other end. Since a composite member that becomes large over time is used and the composite members are aligned and arranged so that there is no space between them and then pressed by cold, the ratio of the magnetic material and the conductive material is the same at any point. In addition, the space factor of the magnetic material can be increased. Further, it is possible to simplify the process and suppress deterioration of the surface quality due to oxidation.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 (a), (b), and (c) are explanatory views showing a composite member used in the present invention, and FIGS. 2 (a) and (b) align the composite members. FIG. 2 (C) is an explanatory view showing the state of arrangement, FIG. 2 (C) is an explanatory view showing the magnetic anisotropic conductive member obtained by the present invention, and FIGS. 3 (A) and 3 (B) are in FIG. 2 (A). A cross-sectional view and FIG. 4 are explanatory views showing a cold isostatic pressing device used in the method for producing a magnetic anisotropic conductive member of the present invention, and FIGS. 5 (a), 5 (b) and 5 (c) are Explanatory drawing which shows the other example of a composite member, FIG. 6 (a), (b) is explanatory drawing which shows the other example of the manufacturing method of the magnetic anisotropic conductive member of this invention. 7A and 7B are explanatory views showing a rotor for an induction motor having a magnetic anisotropic conductive member, and FIG. 8A and FIG.
(B) is an explanatory view showing a composite member in which the problems are solved by the present invention, FIGS. 9 (A) and (B) are FIG. 8 (A),
FIG. 10 is an explanatory view showing a state in which the composite members shown in (B) are arranged in an array, and FIGS. 10 (A) and 10 (B) are sectional views of FIG. 9 (A). Explanation of code 11 …… Magnetic material 12 …… Conductive material 13 …… Composite member 14 …… Top cover 15 …… High pressure liquid 16 …… Rubber stopper 17 …… Rubber bag 18 …… High pressure cylinder

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Hiroshi Kainuma               1500 Kawajiri-cho, Hitachi City Hitachi Cable Stock Association               Company Toyoura factory (72) Inventor Shigeru Okamoto               2-1-2 Marunouchi, Chiyoda-ku, Tokyo               Hitachi Cable, Ltd.                (56) References JP-A-62-23345 (JP, A)                 JP-A-62-53161 (JP, A)

Claims (1)

(57) [Claims] A large number of magnetic members are integrated by a conductive material to form a hollow cylindrical body, and the plurality of magnetic members are arranged along the radiation extending from the central axis of the hollow cylindrical body so that the magnetic permeability in the radial direction is reduced. In a squirrel cage rotor of an induction motor, a magnetic material whose cross-sectional area increases from one end to the other due to a linear change in width. And manufacturing a composite member by coating the same with a conductive material, and aligning a plurality of the composite members along the radiation extending from the center point and with the one end positioned at the center point side and annularly adjacent to each other. Arranging and forming a hollow cylindrical body in which a large number of the magnetic members are integrated by the conductive material by cold pressing in a state where the large number of composite members arranged in an annular shape are stacked in multiple stages Method for producing a magnetic anisotropy conductive member used in the cage rotor for an induction motor and having a that stage.