JPH09117082A - Laminated rotor and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the drive power and allowable r.p.m. while enduring a frequent intermittent operation and a long term operation being accompanied with extreme acceleration/deceleration by laminating a plurality of rotor elements each having a magnetic path where magnetic and nonmagnetic stripe parts are juxtaposed while being bent with respect to the center of a planar body. SOLUTION: A magnetic metal board 3 is composed of low carbon steel plates or silicon steel plates 0.3-2mm thick. The board 3 is provided with a plurality of strip holes 7 being bent with respect to the center of the board 3 and extending from the surface to the rear thereof. The holes 7 are filled with Mn 20wt.% of nonmagnetic manganese steel powder and sintered to produce a composite 1A. Outer circumferential part 3A is then cut off between the outer end of hole 7 and the end of composite 1A to obtain a rotor element 1 having nonmagnetic part 9 and magnetic part 11. The rotor elements 1 are laminated and bonded or pressed to obtain a laminated rotor. This structure realizes an inexpensive rotor having good characteristics and stabilized quality which can be manufactured automatically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated rotor for improving the characteristics of a rotor used in a reluctance synchronous motor (hereinafter referred to as RSM) or a reluctance generator (hereinafter referred to as RG) and a method for manufacturing the same. Regarding

[0002]

2. Description of the Related Art Conventionally, an RSM in which a rotor is attracted and rotated by a rotating magnetic field generated by a three-phase alternating current applied to a stator has been used as an AC generator for high-speed response, high efficiency, high-speed rotation, and the like. Since RG can expect advantageous characteristics such as slip ring-less, small size, and high speed rotation, various developments are underway.

For example, as shown in FIG. 5, a rotor 101 used in a large RSM has a center 10
3, a plurality of magnetic paths 105 bent in a convex shape are provided, and the magnetic flux of the rotating magnetic field emitted from the stator around the rotor 101 passes through each of the magnetic paths 105 to generate the magnetic path 105.
In order to magnetize, the magnetic force acting on this magnetic path 105 gives a rotational force to the rotor 101. Each of these magnetic paths 105 bends a plate of a plurality of magnetic materials and non-magnetic materials,
The rotor 1 is made by stacking and joining, or by filling and joining a non-magnetic material or a magnetic material between plates of a magnetic material or a non-magnetic material.
01. (See Japanese Patent Application No. 7-6518 and Japanese Patent Application No. 7-6524).
5A and the non-magnetic portion 105B, most of the magnetic flux of the rotating magnetic field passes through the magnetic portion 105A.

[0004]

By the way, since the magnetic portion 105A and the non-magnetic portion 105B of the rotor 101 are made of a commercially available plate material, pipe material or the like, mechanical characteristics and magnetic characteristics are obtained. However, there was a situation in which the rotor characteristics could not be optimized because sufficient characteristics could not be obtained. In addition, the magnetic part 105
In many cases of A and the non-magnetic portion 105B, since the metal material is used, the rotor 101 is a metal lump, and unless there is a rapid change in the amount and direction of the magnetic flux passing through the magnetic path 105, the rotor 101 Although the heat generated in the rotor 101 due to the eddy currents generated in the RSM is small, when the rotation speed of the rotor 101 is high and the three-phase AC current supplied to the RSM contains harmonics, intermittent operation of the RSM and sudden addition When there is deceleration, reversal of the rotation direction, etc., a large eddy current is generated in the rotor 101 for a long time, which causes the rotor 101 to generate heat and heat an adjacent mechanical device, which causes inconvenience. doing.

An object of the present invention is a mechanical device having good characteristics such as a large driving force and a large permissible rotational speed, and being forced to perform a severe long-term operation accompanied by frequent intermittent operation and extreme acceleration / deceleration. For further use R is more likely to generate eddy currents in the rotor
It is to provide a laminated rotor that can be used for G and a manufacturing method thereof.

[0006]

In order to achieve the above object, a laminated rotor of the present invention according to claim 1 is a linear magnetic portion and a non-magnetic portion bent in a convex shape with respect to the center of a plate-like body. And a plurality of rotor elements having magnetic paths alternately arranged side by side.

In the above structure, a rotor element having a magnetic path bent with respect to the center of the plate-like body is formed, and a plurality of rotor elements are superposed to form a laminated rotor. The driving force can be increased and eddy current is less generated.

According to a second aspect of the present invention, there is provided a method of manufacturing a laminated rotor in which a plurality of streak-like holes are provided which are bent in a convex shape with respect to the center of a magnetic or non-magnetic substrate and are provided therethrough. In, a non-magnetic or magnetic powder metal material is filled and sintered, the substrate and the metal material are joined to form a composite,
It is characterized in that rotor elements obtained by deleting the outer peripheral portion of this composite are overlapped.

According to a third aspect of the present invention, in the method for manufacturing a laminated rotor, nonmagnetic material layers and magnetic material layers are alternately laminated along concave portions formed by being bent in a convex shape with respect to the center of a cored bar. It is characterized in that rotor elements obtained by cutting the combined rotor material into thin slices are superposed.

According to a fourth aspect of the present invention, there is provided a laminated rotor manufacturing method according to the second or third aspect, wherein the rotor element is surface-treated or an insulating film is sandwiched between the rotor elements. It is characterized in that the matching rotor elements are electrically insulated to reduce the eddy current generated in the trunk of the laminated rotor.

According to the manufacturing methods of claims 2 and 3, there is an effect that the laminated rotor of claim 1 can be manufactured relatively easily. According to the manufacturing method of claim 4, the laminated rotor is manufactured. The characteristics of the laminated rotor can be further improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIGS. 1, 2 and 3, a magnetic metal substrate 3 constituting a rotor element 1 of a laminated rotor in RSM and RG has a low carbon thickness T of about 0.3 to 2 mm. Steel plates, silicon steel plates, etc. are used. The substrate 3 is provided with a plurality of streak-like holes 7 which are bent in a convex shape with respect to the center 5 and communicate from the front surface to the back surface of the substrate 3. These holes 7 are filled with non-magnetic metal powder such as high manganese steel (containing about 20% by weight of manganese) and sintered to form a composite 1A. After that, the outer peripheral portion 3A between the outer end of the hole 7 and the end of the composite body 1A is deleted to obtain the rotor element 1,
The magnetic powder is hard to pass through the non-magnetic portion 9 of the metal powder that has entered the hole 7.
Further, the end branch portion of the substrate 3 becomes the magnetic portion 11 through which magnetic flux easily passes. The rotor element 1 thus obtained is laminated and bonded by using an adhesive or mechanical means to obtain a substantially cylindrical laminated rotor 13. Low cost, easily available low carbon steel plate, silicon steel plate, and cheap metal powder of high manganese steel can be used for the substrate 3, so that a large-sized and inexpensive laminated rotor 13 can be produced and an output of 10 kw or more can be obtained. It is used for RSM or RG.

As shown in FIG. 4, the substrate 15 is made of a non-magnetic, high-manganese steel plate similar to the above, and the hole 1 connected to the end branch portion is formed.
7. Magnetic powder of magnetic cobalt alloy (containing 40% by weight of cobalt) having good characteristics is press-fitted into 7 and sintered to remove the outer peripheral portion 15A. There is a rotor element 23 with a part 21. The cobalt-based alloy has high magnetic permeability and magnetic susceptibility, and the driving force generated in the laminated rotor having the rotor element 23 becomes large, so that it is small and lightweight, but an RSM or RG having a large output can be formed. In FIG. 4, 25 is the center of the substrate 15.

Rotor 10 which is a conventional metal block shown in FIG.
When the rotor material having the same structure as 1 is cut into thin slices, rotor elements similar to the rotor elements 1 and 23 are obtained. When the rotor 101 is joined to the magnetic portion 105A, the non-magnetic portion 105B, and the core metal 107 by HIP processing or the like, the joint strength is about 1200 (N / mm ² ). Therefore, since the rotor element obtained from the rotor material made in the same manner as the rotor 101 has extremely high strength, it is used for RSM or RG having a rotation speed of about 30,000 to 50,000 (r.pm).

The above-mentioned rotor element according to the present invention is subjected to phosphoric acid treatment, phosphate coating, etc., an electrical insulating film is provided on the surface of the rotor element, and the processing is completed. Silicon resin adhesive, screws, bolts, etc. By using the joining means of (1), a large number of rotor elements are superposed on each other to obtain a laminated rotor in which eddy current is unlikely to occur.
Such a laminated rotor is used for RSM for main spindles of machine tools and the like for frequent intermittent operation, rapid acceleration / deceleration, small RG for vehicles, and the like. This type of rotor has a rotor element of 0.3
A thickness of up to 0.5 mm is preferred. In a large RSM that often rotates at a synchronous speed and has a small number of intermittent operations, a laminated rotor may be made by using a rotor element having a thickness of about 2 mm without performing electrical insulation treatment.

The high manganese steel used in making the rotor elements 1, 23, etc. has a low magnetic permeability and a stable non-magnetic structure. Especially, the coefficient of thermal expansion thereof is magnetic and low carbon which is easily magnetized. It is almost the same value as steel silicon and cobalt alloys,
Even if high-manganese steel forms a composite with other metals, no residual stress or thermal stress is generated, so the strength of the composite is high,
The high speed allowable speed is high.

Holes 7, 1 in the rotor elements 1, 23
7 is processed by etching, laser fusing, press working, electric discharge machining, etc., which is selected and carried out depending on the number of rotor elements 1 and 23 to be manufactured, required characteristics, size of shape, and the like.

The laminated rotor 13 thus obtained can be mass-produced by an automatic machine, and is manufactured by a process with few interventions, so that it has advantageous characteristics such as uniform characteristics and low cost.
M and RG can be provided.

The present invention is not limited to the example of the above-described embodiment, but can be modified appropriately to
It can be implemented in other forms.

[0021]

As can be understood from the above description of the embodiment, according to the invention of claim 1, the characteristics are good,
An inexpensive laminated rotor can be obtained. Further, it is possible to provide a rotor for RSM and RG, which can be automatically manufactured regardless of availability, has stable quality, is inexpensive, and has a wide range of uses.

According to the inventions of claims 2 and 3, the laminated rotor of the invention of claim 1 can be manufactured relatively easily. According to the invention of claim 4, the characteristics of the laminated rotor can be further improved.

[Brief description of the drawings]

FIG. 1 is an external view of a rotor element showing an example of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an external view of a laminated rotor for RSM and RG of the present invention obtained by superposing the rotor elements of FIG.

FIG. 4 is an external view of a rotor element showing an example of another embodiment alternative to FIG.

FIG. 5 is an external view of a conventional RSM rotor.

[Explanation of reference numerals] 1,23 Rotor element 3,15 Substrate 5,25 Center 7,17 Hole 9,19 Non-magnetic part 11,21 Magnetic part 3A, 21A Outer peripheral part 13 Laminated rotor

Claims (4)

[Claims] 1. A plurality of rotor elements, each having a magnetic path in which streaky non-magnetic portions and magnetic portions bent in a convex shape with respect to the center of the plate-like body are alternately juxtaposed, are stacked. Laminated rotor to. 2. A non-magnetic or magnetic powdery metal material is filled in a plurality of streak-shaped holes that are bent in a convex shape with respect to the center of a magnetic or non-magnetic substrate and are provided so as to penetrate therethrough. Then, the substrate and the metal material are sintered to form a composite body, and the rotor element obtained by removing the outer peripheral portion of the composite body is superposed on the rotor body. 3. A rotor material obtained by alternately stacking layers of a non-magnetic material and a magnetic material along a concave portion formed by being bent in a convex shape with respect to the center of a core metal, and obtained by thinly dividing the rotor material. A method of manufacturing a laminated rotor, which comprises laminating rotor elements. 4. A surface treatment is applied to a rotor element, or an insulating film is sandwiched between the rotor elements to electrically insulate adjacent rotor elements to reduce an eddy current generated in the trunk of the laminated rotor. The method of manufacturing a laminated rotor according to claim 2, wherein the laminated rotor is manufactured.