JPH11144930A - Stripe-like magnetic path forming member and manufacture of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate manufacture and improve strength, by stacking stripe-shaped metal pieces formed by alternately and metallurgically joining a magnetic metal material to be a magnetic region and a non-magnetic metal material to be a non-magnetic region and laid out in one direction within a plane. SOLUTION: A rotor core for a reluctance motor needs to have a structure such that a magnetic region 2 and a non-magnetic region 3 are made continuous in the extending direction of a rotation axis 6. A cross section of a core member, viewed perpendicularly to the rotation axis 6, is stripe-shaped from one pole toward the other pole of the outer circumference of the core member by the magnetic region 2 for leading a magnetic flux and the non-magnetic region 3 where a magnetic flux is less likely to pass, and the cross-sectional shape is extended in the longitudinal direction of the rotation axis 6, thus forming the core member. The core member has a structure such that stripe-shaped metal pieces, formed by alternately and metallurgically joining a magnetic metal material to be the magnetic region 2 and a non- magnetic metal material to be the non-magnetic region 3 and laid out in one direction within a plane, are stacked in the longitudinal direction of the rotation axis. Thus, the eddy-current loss in the motor actuation can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stripe-shaped magnetic path forming member for forming a magnetic path by a laminated portion in which non-magnetic layers and magnetic layers are alternately laminated, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Recently, in the field of dynamo or motor, a synchronous dynamo or motor has been used. For example, a summary of the 1995 IEEJ National Convention
5-29-30, JP-A-6-31677 or JP-A-6-31677
JP-A-274460 discloses a reluctance motor utilizing the magnetoresistance effect as a synchronous motor (synchronous motor).

In a reluctance motor, a magnetic material and a non-magnetic material are alternately stacked on a core of the motor so as to form a magnetic path in order to use a magnetoresistive effect. Specifically, for example, Japanese Unexamined Patent Publication No. 6-31677 discloses a material for forming the magnetic region, such as silicon steel, and a material for forming the non-magnetic region 2 such as aluminum and resin. The reluctance rotor does not require a permanent magnet, is considered to be excellent in cost and mechanical strength, and is promising as a rotor for a synchronous motor suitable for high-speed rotation.

[0004]

As described above, the rotor of a reluctance motor requires a laminated structure of a non-magnetic region and a magnetic region.
In the method described in No. 1677, in which a component to be a non-magnetic layer and a magnetic layer are prepared as separate components and obtained by mechanically fixing or fixing with an adhesive, the number of components is large,
There is a problem that the manufacturing process becomes complicated. Further, in the method of mechanically fixing, there is a problem that the magnetic properties are deteriorated due to the stress applied to the fixed portion. Further, a non-magnetic material portion is punched out from a thin disk of a magnetic material disclosed in JP-A-7-274460 as a method for manufacturing a part of a rotor by pressing or the like, and a plurality of the non-magnetic materials are stacked in the axial direction. There is a way to make it a core. This method has an advantage that it can be easily manufactured because it can be manufactured by simple machining such as punching with a press.

However, according to the study of the present inventors, there is a problem in strength and processing accuracy in a structure in which a non-magnetic material portion is punched. That is, in order to improve the performance of the motor,
A structure in which a striped magnetic path in which the non-magnetic material portion and the magnetic material portion are arranged as narrowly as possible must be formed. However, if the punching interval is narrow, the strength is reduced accordingly. In addition, it is quite difficult to punch a large number of portions in a slit shape at intervals of, for example, 1 mm or less, and extremely high press accuracy is required, which leads to an increase in cost. An object of the present invention is to provide a striped magnetic path forming member which is particularly easy to manufacture, has high strength, and can obtain excellent magnetic properties, and a method for manufacturing the same, in view of the above-mentioned problems.

[0006]

Means for Solving the Problems The present inventors have studied a configuration in which a non-magnetic region and a magnetic region can be arranged at as small an interval as possible in order to improve magnetic characteristics. Then, they have found that a magnetic metal material and a non-magnetic metal material can be used in a metallurgical manner to use a striped metal plate which is arranged in a plane in a one-way striped shape, and arrived at the present invention.

That is, the present invention provides a striped metal piece in which a magnetic metal material serving as a magnetic region and a nonmagnetic metal material serving as a nonmagnetic region are alternately metallurgically joined and arranged in a stripe in one direction in a plane. Are formed as a striped magnetic path forming member. Preferably, an insulator is inserted between the striped metal plates to be stacked.

In the above-mentioned striped magnetic path forming member, for example, a magnetic metal plate and a non-magnetic metal plate are alternately laminated, and the laminated body is integrated by hot isostatic pressing, and then the laminated body appears in a layered form. Rolled from the surface side to form a striped metal plate, and after the striped metal plate is processed into a predetermined shape into a striped metal piece, the striped metal piece substantially changes the direction of the striped metal piece between the striped metal pieces. It can be manufactured by laminating the same.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, an important feature of the present invention is that a striped magnetic path is constituted by striped metal pieces.
For example, in a rotor core for a reluctance motor, as shown in FIG. 1, the magnetic region 2 and the non-magnetic region 3 must have a structure that is continuous in the direction in which the rotation axis extends.

When the present invention is applied to a rotor core for a reluctance motor, more specifically, it has a rotating shaft and a core member, and the sectional shape of the core member as viewed in a section perpendicular to the rotating shaft is a magnetic region for guiding a magnetic flux. And a non-magnetic region where the magnetic flux is difficult to pass, forming a stripe shape from one pole to the other pole on the outer periphery of the core member, and the cross-sectional shape is extended in the longitudinal direction of the rotating shaft to form a reluctance having a core member. A rotor core for a motor, wherein the core member is formed by alternately metallurgically joining a magnetic metal material to be a magnetic region and a non-magnetic metal material to be a non-magnetic region, and is arranged in a stripe in one direction in a plane. The striped metal pieces are laminated in the longitudinal direction of the rotating shaft to form a rotor core for a reluctance motor.

For example, by using a hot isostatic press, it is possible to metallurgically bond dissimilar metal plates or thin strips, and the laminated body obtained as shown in FIG. By rolling with the roll 4 from the surface side, a striped, in other words, a striped metal plate is obtained. The striped metal plate 1 joined in a metallurgical manner is a single piece, and can solve the problem of insufficient strength as in the case where a non-magnetic portion is formed by a punched space.

In the present invention, instead of the above-mentioned hot isostatic pressing, it is also possible to integrate them by a rolling technique such as hot pack rolling. In addition, the method by hot isostatic pressing is a preferable method in that a thick laminated body can be obtained without being restricted by the rollable thickness.
The fact that a thick laminated body can be obtained means that the surface where the laminated body appears in a layered form can be widened, and a wide striped metal plate can be obtained in which the number of materials can be increased.

In the present invention, when a rotor core for a reluctance motor is used, a striped metal plate is processed into a core piece 5 as shown in FIG. 2, but press stamping is performed from a thin striped metal plate. It is possible to obtain a core piece substantially processed into the cross-sectional shape of the rotor core by water jet, laser cutting, or the like. Among them, press punching is an excellent method for producing core pieces having the same shape, because the number of processing steps is small. The obtained core piece 5 is shown in FIG.
The shaft hole and the rotating shaft 6
By integrally combining and, the rotor core for a reluctance motor shown in FIG. 1 can be obtained.

The striped metal plate shown in FIG. 1 or 2 has a simplified structure. For example, the dissimilar metal plate prepared for manufacturing the striped metal plate which is an important component of the present invention has, in its thickness, substantially the thickness of the magnetic region and the non-magnetic region (corresponding to the width of the stripe). ) Can be set. That is, by cold rolling or the like, 1 mm or less,
Alternatively, it is easy to manufacture a metal or alloy thin plate of 0.5 mm or less, and a thin plate of 0.1 mm or less can be obtained. This thickness can be used as the width of the magnetic region or the non-magnetic region. Therefore,
The actual striped state is several tens to several hundreds layers or more. In particular, as a rotor core for a reluctance motor, it is required that the width of the magnetic region and the non-magnetic region be as small as possible, and the above-described structure in which thin plates are stacked is effective.

Further, in the present invention, according to the structure in which the striped metal pieces are stacked, the eddy current loss during the operation of the motor and the like is reduced as compared with a simple integrated structure due to the contact resistance between the striped metal pieces or insulation by the space. It is possible to In the present invention, it is desirable to insert an insulator between the striped metal pieces because the above-mentioned eddy current loss can be reliably suppressed. As a rotor core for a reluctance motor,
It is also possible to form a keyway or the like in the core piece so as not to disturb the magnetic path as much as possible.

As the magnetic metal material used in the present invention, pure iron, silicon steel (Fe-3 wt% Si), or Fe-N
A ferromagnetic material such as an i-based alloy can be used.
As the non-magnetic material, a non-magnetic austenitic stainless steel or a non-magnetic metal such as Cu can be used. As the insulator that can be inserted between the striped metal pieces, resin, ceramic, or the like can be used. However, it is desirable that the insulator be as thin as possible, and that it is desirable from the viewpoint of magnetic characteristics, and is preferably resin.

[0017]

According to the present invention, a multi-layer striped magnetic path forming member having a magnetic metal layer and a non-magnetic layer and having excellent magnetic properties can be easily obtained and has high strength.
Therefore, this is an effective technique for practically and mass-producing a reluctance motor that applies a high-speed rotation of 10,000 rpm or more.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory view showing an example of the manufacturing method of the present invention.

[Explanation of symbols]

1 striped metal plate, 2 magnetic region, 3 non-magnetic region, 4
Roll, 5 core pieces, 6 rotating axes

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Ichiro Kishigami 2107-2 Yasugi-cho, Yasugi-shi, Shimane Hitachi Metals Co., Ltd. (72) Inventor Akira Kawakami 2107-2 Yasugi-cho, Yasugi-shi, Shimane Hitachi Metals, Ltd. Yasugi Factory

Claims (3)

[Claims] 1. A lamination of a striped metal piece in which a magnetic metal material to be a magnetic region and a nonmagnetic metal material to be a nonmagnetic region are alternately metallurgically joined and arranged in one direction in a plane. A striped magnetic path forming member, characterized by being formed by: 2. The striped magnetic path forming member according to claim 1, wherein an insulator is inserted between the striped metal pieces to be stacked. 3. A magnetic metal plate and a non-magnetic metal plate are alternately laminated, and the laminated body is integrated by hot isostatic press molding. Then, after forming the striped metal plate into a striped metal piece processed into a predetermined shape, laminating the striped metal pieces so that the striped metal pieces have substantially the same stripe direction. A method for producing a striped magnetic path forming member.