JP2002031135A - Magnetic bearing structure and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic bearing structure and a manufacturing method thereof capable of facilitating the production of laminated steel plate, enhancing the yield of the steel plate, facilitating the machining of the laminated steel plate, preventing the peeling off of an insulation material and reducing a production/processing cost and an eddy current generated at a stator part. SOLUTION: In the homo-polar type magnetic bearing structure, tooth end parts, at which a coil 31 is disposed, of a stator core 29 mounted in a casing 22 surrounding a rotation rotor 23 in the floating state and forming a cross section to u-shape are axially disposed in adjacent to each other to constitute N pole and S pole. A laminated direction of a cross grain 32 of a steel plate 25 in the laminated state of the tooth end part of the stator core 29 formed by the laminated steel plate 28 is directed in a direction perpendicular to the axis direction of the rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic bearing structure for supporting a rotating shaft without contact, and more particularly to a homopolar magnetic bearing structure and a method of manufacturing the same.

[0002]

2. Description of the Related Art Turbo compressors are more suitable for larger capacity and smaller size than reciprocating compressors and screw compressors, and are easy to be oil-free. Because of this, the factory air source,
It is widely used as a general-purpose compressor such as a source air for air separation or an air source related to a process.

On the other hand, gas bearings, sliding bearings, and magnetic bearings have conventionally been used for turbo compressors in order to support a high-speed rotating shaft for a high-speed motor that is directly connected to the turbo compressor. In particular, high-speed rotation (for example, 100,000 min ^-1 or more)
One of the radial magnetic bearings for high-speed rotating shafts is a homopolar magnetic bearing that supports a rotating rotor that forms a high-speed rotating shaft for high-speed motors by passing magnetic flux through the magnetic attraction force and supporting it without contact. is there.

FIG. 5 is a schematic view showing the structure of a conventional homopolar magnetic bearing, and FIG. 6 is a view taken along the line CC of FIG. In FIG. 5, a magnetic bearing structure 1 for a homopolar magnetic bearing includes a rotor 3 having a predetermined length, which is arranged at the axis of a casing 2 and parallel to the axial direction, is rotatable at high speed, and has an outer diameter D1. A stator core 8 having a U-shaped plate width W1 and having a predetermined gap G with an outer peripheral surface 4 of the rotor 2 and being mounted in a concave portion 7 of an inner peripheral surface 6 of the casing 2, facing the outer peripheral surface 4 of the rotor 3 of the stator core 8; It is composed of two tooth ends 9, 9 arranged on the inner peripheral side and coils 10, 10 surrounding the tooth ends 9, 9.

[0005] Further, as shown in FIG.
Are arranged in a plurality (four in this figure) equally (4 equally) with a predetermined gap G from the outer peripheral portion 4 of the rotor 3.
Although not shown, the stator cores 8 are usually arranged at at least two places at predetermined intervals in the axial direction of the rotor 3. Therefore, high-speed rotation can be performed in a stable state. Further, the stator core 8 is made of a thin steel plate 11 having a thickness T.
Then, an insulating material 12 also serving as an adhesive is applied between adjacent steel plates 11, and the laminated steel plates 14 are composed of a plurality of platelets 13 in a laminated state having a predetermined length L1 by sequentially bonding one by one. In addition, as shown in FIG.
The lamination (lamination) direction of 3 is arranged so as to be horizontal to the axial direction of the rotor 3.

As described above, in the magnetic bearing structure 1 for a homopolar magnetic bearing, the tooth ends 9, 9 of the stator core 8 surrounding the rotor 3 are axially adjacent to each other, and the coils 10, 10 are used to connect the N pole and the S pole of the electromagnet. Since the poles are formed, the rotor 3 can be levitated and supported in a non-contact manner by controlling the suction force of the tooth ends 9 and 9 at the opposing positions. Therefore, the homopolar magnetic field is oriented along the rotor axis on the outer peripheral surface 4 of the rotor 3 as shown by the dotted arrow in FIG.

[0007]

FIG. 7 is a schematic view showing a step of forming a laminated shape of a laminated steel sheet of a conventional stator core. Generally, the stator core 8 of the magnetic bearing 1 for a homopolar magnetic bearing has a plate thickness T as shown in FIG.
In this method, a rectangular thin steel plate 11 having a width H1 and a height H1 is manufactured one by one by using a punching die (not shown). However, since the punching die is formed by using an expensive die such as a wear-resistant alloy tool steel, there is a problem in that it takes time and increases the manufacturing cost. Further, since the U-shaped punching process is performed, a portion having a width H2 near the center and a height H2 becomes scrap, thereby causing a problem that the material yield is reduced. In addition, as shown in FIG.
7 are sequentially stacked while applying the insulating material 12 one by one to finally form a laminated steel plate 14 having a predetermined length L1 in a laminated state as shown in FIG. 7C, which further increases the manufacturing cost. There were also problems.

FIG. 8 is a schematic view showing a state in which the stator core manufactured in FIG. 7 is machined on the tooth end side of the laminated steel plate. In FIG. 8A, the four stator cores 8 are arranged on a mounting jig table (not shown) so that the grain direction of the grain 13 of the steel sheet 11 in a stacked state is horizontal (final) with respect to the axial direction of the rotor 3. The stator core 8 is fixed in the direction of the ceiling (in the figure, the ceiling) so that the tooth end 9 side of the stator core 8 is inside. next,
By operating a rotary cutting machine tool (not shown), for example, a normal lathe or a vertical lathe, the inner peripheral surface 15 of the tooth end 9 is made to have an inner diameter D2 (=
D1 + 2G) The area K indicated by oblique lines until roundness is secured.
Minutes are cut by rotary cutting. However, as shown in FIG. 8B, since a large rotary cutting load is continuously applied from the side surface of the grain 13 of the laminated steel sheet 11 during the rotary cutting, the tip of the laminated steel sheet 14 is bent. However, the bending load causes peeling such as crushing of the insulating material 12 in the rotation direction, or tearing by the cutting blade. Therefore, FIG.
As shown in (c), there is a problem that the steel plates 11 come into contact with each other and the eddy current in the stator portion increases, thereby deteriorating the levitation force on the rotor 3 and the rotation characteristics. Further, using an upright cutting machine or the like in place of these lathes, the inner peripheral surface 15 of the tooth end 9 is cut in the direction parallel to the grain 13 of the laminated steel sheet 11 so as to have an inner diameter D2. Also adjacent steel plate 1
There is also a problem that it is difficult to ensure smoothness and roundness because a step occurs between the first plate 13.

The present invention has been made to solve such a problem. That is, an object of the present invention is to facilitate the production of laminated steel sheets and improve the yield of the steel sheets, to facilitate the cutting of the laminated steel sheets and to prevent the peeling of the insulating material, to reduce the production and processing costs, and to improve the stator portion. An object of the present invention is to provide a magnetic bearing structure capable of reducing an eddy current generated in a magnetic field and a method for manufacturing the same.

[0010]

According to the present invention, the rotor is mounted in a casing that surrounds the rotating rotor in a floating state,
A homopolar magnetic bearing structure in which the teeth of the stator core, in which the coils of the stator core are formed to have a U-shaped cross section, are arranged adjacent to each other in the axial direction to form N poles and S poles, is a stator core formed of laminated steel sheets. A magnetic bearing structure is provided, wherein the lamination direction of the steel plates in the lamination state of the tooth ends is arranged in a direction orthogonal to the axial direction of the rotor.

According to the configuration of the present invention, the lamination direction of the laminated steel plates at the respective tooth ends where the coils of the stator core of the laminated steel plates having a U-shaped cross section are arranged is set to the axis of the rotor. Are arranged in a direction orthogonal to the direction, and a homopolar magnetic bearing structure is formed adjacent to each other in the axial direction to form an N pole and an S pole. Therefore, each of two tooth ends of the stator core surrounding the rotor extends in the axial direction. By arranging two coils adjacent to each other, an N pole and an S pole of the electromagnet can be formed. Thus, the rotor can be floated without contact by controlling the suction force of the tooth end located at the opposing position, and can be stably supported at high speed.

[0012] According to a preferred embodiment of the present invention, the stator core is manufactured by winding and shaping a continuous steel sheet having a U-shape while applying an insulating material to a continuous steel sheet, and then cutting it into equal parts. . According to this configuration, the stator core of the laminated steel sheet having a U-shaped cross section is formed along the outer peripheral surface of a winding mold having a rectangular cross section of a predetermined size as shown in an embodiment described later. An insulating material that also serves as an adhesive is applied to the surface of a steel sheet, and a predetermined thickness is applied to a continuous strip-shaped thin steel sheet, and a winding rectangular shape having a space portion of a predetermined thickness can be quickly and easily formed by winding. . Furthermore, if this winding rectangular shape is equally divided by a cutting machine, a U-shaped laminated steel plate separated by an insulating material can be easily manufactured. On the other hand, it is possible to manufacture with a simple and simple winding die without using expensive punching dies, thereby reducing manufacturing costs and omitting the application of insulating material to steel sheets and lamination work, which had been done one by one. Productivity can be improved. In addition, since the scraping near the center of the steel sheet generated during the punching operation of the punching die can be prevented, the yield rate of the steel sheet can be significantly improved.

According to another preferred embodiment of the present invention, the stator core is formed by laminating steel plates in a laminated state on an inner peripheral surface side of a tooth end portion arranged in a direction orthogonal to an outer peripheral surface of the rotor. Perform rotary cutting in the horizontal and vertical directions. According to this configuration, the lathe or the vertical lathe is operated to maintain a predetermined gap with the outer peripheral surface of the rotor, thereby performing the rotary cutting process on the inner peripheral surface of the tooth end portion, and the inner peripheral surface of the tooth end portion. It can be processed from the lamination direction and the horizontal direction of the laminated plate on the side. As a result, the rotational cutting load can always be applied in the horizontal direction to the grain of the laminated steel sheet at the tooth end, so that uneven load and bending do not occur, so secure the grain of the steel sheet and crush the insulating material. The smoothness and roundness can be ensured by preventing peeling such as slipping or shredding. Therefore, contact between the laminated steel sheets caused by peeling of the insulating material due to machining or the like is prevented, eddy current in the stator portion is prevented, and the levitation force and rotational characteristics of the rotor are not deteriorated.

Further, according to the present invention, a tooth end portion on which a coil of a stator core, which is mounted in a casing surrounding a rotating rotor in a floating state and has a U-shaped cross section, is arranged adjacent to the axial direction. A homopolar magnetic bearing structure comprising an N pole and an S pole, wherein (A) a steel sheet continuous to a winding die is wound to a predetermined thickness while applying tension to the steel sheet, and an insulating material is applied to the steel sheet during winding. (B) Next, the wound core released from the winding die is cut into equal parts to form a stator core having a U-shaped laminated plate. (C) Next, a predetermined rotary cutting process is performed in the direction parallel to the laminating direction of the lamination state of the laminated state of the plate, which is arranged orthogonally to the outer peripheral surface of the rotor on the inner peripheral surface side of the tooth end portion of the stator core, D) Next, the coils are arranged at the respective tooth ends of the stator core. The method of manufacturing a magnetic bearing, characterized in that there is provided.

According to the method of the present invention, along the outer peripheral surface of the winding mold having a rectangular cross section of a predetermined size,
An insulating material that also serves as an adhesive is applied to the surface of a steel sheet, and a predetermined thickness is applied to a continuous strip-shaped thin steel sheet, and a winding rectangular shape having a space portion of a predetermined thickness can be quickly and easily formed by winding. . Further, since the winding core of the laminated steel sheet can be manufactured by a simple and simple winding die, the manufacturing cost can be reduced. In addition, since an insulating material can be applied to the steel plate during winding and bonded, the productivity can be improved. Furthermore, since the winding core of the laminated steel sheet is formed by winding the steel sheet, the generation of scrap can be prevented, and the yield rate of the steel sheet can be greatly improved. Further, the winding core released from the winding die is cut into equal parts by a cutting machine to form a stator core having a U-shaped laminated plate. For this reason, a U-shaped laminated steel plate separated by an insulating material can be easily and efficiently manufactured.

Next, on the inner peripheral surface side of the tooth end of the stator core manufactured in the U-shape as described above, a predetermined rotary cutting process is performed in a direction parallel to the laminating direction of the laminated steel sheets.
This prevents uneven load and bending, so that the rotational cutting load can always be applied in the horizontal direction to the laminated steel sheet at the tooth end. Therefore, a predetermined inner diameter cutting process can be performed while securing the grain of the steel plate and preventing the insulating material from being crushed, shredded, or peeled, and a smooth inner peripheral surface and roundness can be secured. Furthermore, since the contact between the laminated steel plates caused by the peeling of the insulating material due to the machining does not occur, the eddy current in the stator portion is prevented, and the levitation force and the rotation characteristics of the rotor are not deteriorated. Also, after such machining is completed, an electromagnet (coil) is arranged on the outer periphery of each tooth end of the stator core that has been cleaned by removing chips and the like,
The stator core on which the coils are arranged is mounted in a recess on the inner peripheral surface in the casing. Therefore, since it is not necessary to take care of troublesome cutting work after the rotary cutting, productivity can be improved.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In each of the drawings, common portions are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is an overall configuration diagram showing the configuration of a homopolar magnetic bearing according to the present invention, and FIG.
FIG. In FIG. 1, a magnetic bearing structure 21 for a homopolar magnetic bearing according to the present invention includes a rotor 23 having a predetermined length, which is arranged at the axis of a casing 22 and parallel to the axial direction and is rotatable at high speed and has an outer diameter D1. And the rotor 23
A U-shaped laminated steel sheet 28 having a predetermined gap G and an inner peripheral surface 26 of the casing 22, which is mounted in a recess 27 of the inner peripheral surface 26 of the casing 22 and is laminated by a predetermined number of thin steel plates 25 having a thickness T. Stator core 29 having a cross-sectional shape and length L2
And two tooth ends 30, 30 disposed on the inner peripheral side of the stator core 29 facing the outer peripheral surface 24 of the rotor 23;
Electromagnets (coils) 31, 31 are arranged so as to surround the tooth ends 30, 30. The lamination direction of the meshes 32, 32 of the steel plates 25 in the laminated state of the laminated steel plates 28 of the respective tooth ends 30, 30 of the stator core 29 having a U-shaped cross section is in the axial direction of the rotor 23. On the other hand, they are arranged so as to be orthogonal to each other.

As shown in FIG. 2, the stator core 29 having the plate width W2 is divided into a plurality (four in the present figure) of the stator core 29 having a predetermined gap G with the outer peripheral portion 24 of the rotor 23. It is arranged in the recess 27 of the inner peripheral surface 26 of the casing 22 equally. Although the stator core 29 is not shown,
Usually, at least two at predetermined intervals in the axial direction of the rotor 23.
It is located in two places. Therefore, high-speed rotation can be performed in a stable state.

As described above, according to the present invention, the grain direction of the laminated steel sheets in the laminated state is rotated by 90 degrees with respect to the outer peripheral surface of the rotor as compared with the conventional art. As described above, the magnetic bearing structure for the homopolar type magnetic bearing arranged by rotating the grain direction of the laminated steel sheets by 90 degrees as described above has a structure in which the respective tooth ends of the stator core surrounding the rotor are arranged in the axial direction as in the related art. Since the N and S poles of the electromagnet are formed by the adjacent coils, the attraction force of the two tooth ends at the opposing positions can be controlled so that the rotor can be levitated and supported without contact. Therefore, this homopolar magnetic field is represented by a dotted arrow in FIG.
It is oriented along the rotor axis on the outer peripheral surface of the rotor.

FIG. 3 is a production view showing a step of forming the laminated shape of the laminated steel sheet of the status core of the present invention. FIG.
As shown in (a), the stator core 29 is wound while applying the insulating material 34 from the supply spray 33 onto the surface of the steel plate 25 of the strip having the thickness T and the width W2 continuous with the winding die 41. After being formed and formed, as shown in FIG. 3 (b), the winding core 42 is cut into equal parts by a cutting machine 43 to produce the U-shaped laminated steel sheet 28. As described above, the stator core of the laminated steel sheet having the U-shaped cross section can be formed quickly and easily. Furthermore, since it can be manufactured without using an expensive punching die, the manufacturing cost can be reduced, and the application of the insulating material to the steel sheet and the lamination work, which have been performed one by one, can be omitted, so that the productivity can be improved. In addition, since a laminated steel sheet can be manufactured from continuous strips, scrapping of the steel sheet can be prevented, and the yield rate of the steel sheet can be significantly improved.

FIG. 4 is a machining diagram showing a machine (rotational cutting) machining state on the tooth end side of the laminated steel sheet of the stator core manufactured in FIG. 3 described above. As shown in FIG. 4A, the stator core 29 fixed on a mounting jig table (not shown)
The inner diameter D2 (in the horizontal direction and the laminating direction of the plate 32 of the steel plate 25 in a laminated state on the inner peripheral surface 35 side of the respective tooth ends 30, 30 arranged in a direction orthogonal to the outer peripheral surface 24 of the rotor 23). =
D1 + 2G), an area K indicated by oblique lines is cut by rotary cutting by operating a lathe, a vertical lathe, or the like until a smooth roundness is secured. Thus, the rotational cutting load is always applied in the horizontal direction to the laminated grain at the tooth end. Therefore, no uneven load or bending occurs, and as shown in FIG. 4B, which is a view taken along the line BB in FIG. 4A, the grain of the steel plate 25 is properly secured, and a thick solid line is used. The insulating material 34 shown can be prevented from being crushed, shredded, or peeled, and the predetermined inner diameter cutting can be smoothly performed. As a result, it is possible to prevent the laminated steel plates from coming into contact with each other due to breakage of the steel plate due to machining, peeling of the insulating material, etc., to prevent eddy currents in the stator portion, and to deteriorate the levitation force and rotational characteristics of the rotor. Absent.

Next, a method of manufacturing the magnetic bearing structure of the homopolar magnetic bearing according to the present invention will be described with reference to FIGS. 1, 3 and 4. A tooth end 30 on which a coil 31 of a stator core 29 having a U-shaped cross section is disposed, which is mounted in a casing 22 surrounding the rotating rotor 23 in a floating state.
Is a homopolar type magnetic bearing structure in which an N pole and an S pole are formed adjacent to each other in the axial direction. (A) First, a plate thickness continuous with a winding mold 41 having a rectangular cross section of a predetermined size. T
While applying a tension to the steel plate 25 having the plate width W2 with the predetermined length L.
2 is formed, and an insulating material 34 is uniformly applied from the supply spray 33 onto the surface of the steel plate 25 during the winding and adhered to form a winding core 42 of the laminated steel plate 28.
(B) Next, the winding core 42 released from the winding die 41
Is cut into equal parts by a cutting machine 43 to form a stator core 29 in which the meshes 32 of the laminated steel plates 25 have a U-shape,
(C) Next, the inner peripheral surface 3 of the tooth end 30 of the stator core 29
On the fifth side, a predetermined (inner diameter D2) rotary cutting process is performed in a direction parallel to the laminating direction of the plate 32 of the steel plate 25 in a laminated state orthogonal to the outer peripheral surface 24 of the rotor 23. After cleaning the powder or the like, each tooth end 30 of the stator core 29
The coil 31 is attached and arranged. Finally, usually, after the stator core is put in the case, the inside of the stator core is cut.

As described above, the stator core is wound along the outer peripheral surface of the die, the insulating material also serving as an adhesive is applied to the surface of the steel plate, and a predetermined tension is applied to the continuous strip-shaped thin steel plate while applying a predetermined tension. The winding rectangular shape having the portion can be formed quickly and easily. Further, since the winding core of the laminated steel sheet can be manufactured by a simple and simple winding die, the manufacturing cost can be reduced. In addition, since an insulating material can be applied to the steel plate during winding and bonded, the productivity can be improved. Furthermore, since the winding core of the laminated steel sheet is formed by winding the steel sheet, the occurrence of scrap can be prevented, and the yield rate of the steel sheet can be greatly improved. Furthermore, the winding core released from the winding die can be cut into equal parts to easily form a stator core having a U-shaped laminated mesh. Thus, a U-shaped laminated steel sheet separated by an insulating material can be easily and efficiently manufactured.

On the other hand, on the inner peripheral surface side of the tooth end portion of the stator core manufactured in a U-shape, a predetermined rotary cutting process is performed by a lathe, a vertical lathe, or the like in a direction parallel to the lamination direction of the laminated steel plates. it can. For this reason, the rotational cutting load can always be applied in the horizontal direction to the lamination state of the tooth end portion without generating an uneven load or bending. Therefore, it is possible to properly secure the grain of the steel sheet, and also to prevent the insulation material from being crushed or shredded or peeled off, and to cut the tooth end to ensure a smooth inner peripheral surface and roundness by accurate inner diameter cutting. can do. Furthermore, since the contact between the laminated steel plates caused by the peeling of the insulating material due to the machining does not occur, the eddy current in the stator portion is prevented, and the levitation force and the rotation characteristics of the rotor are not deteriorated. Further, after such machining is completed, an electromagnet (coil) is arranged on the outer periphery of each tooth end of the stator core that has been cleaned by removing chips and the like. Finally, usually, after the stator core is put in the case, the inside of the stator core is cut.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[0027]

As described above, according to the magnetic bearing structure and the method of manufacturing the same of the present invention, it is easy to manufacture a laminated steel sheet, to improve the yield of the steel sheet, to cut the laminated steel sheet easily, and to use an insulating material. It has excellent effects such as prevention of peeling, reduction of manufacturing and processing costs, and reduction of eddy current generated in the stator portion.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a configuration of a homopolar magnetic bearing according to the present invention.

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a production view showing a step of forming a laminated shape of the laminated steel sheet of the status core of the present invention.

FIG. 4 is a machining diagram showing a machine (rotational cutting) machining state of a manufactured stator core on a tooth end side of a laminated steel plate.

FIG. 5 is a schematic diagram showing a configuration of a conventional homopolar magnetic bearing.

6 is a view taken in the direction of the arrows CC in FIG. 5;

FIG. 7 is a schematic view showing a step of forming a laminated shape of a laminated steel sheet of a conventional stator core.

FIG. 8 is a schematic view showing a conventional stator core machined on a tooth end side of a laminated steel plate.

[Explanation of symbols]

 1,21 Magnetic bearing structure 2,22 Casing 3,23 Rotor 4,24 Outer surface 6,15,26,35 Inner surface 7,27 Recess 8,29 Stator core 9,30 Tooth end 10,31 Coil (electromagnet) 11, 25 Steel plate 12, 34 Insulation material 13, 32 Plate 14, 28 Laminated steel plate 33 Supply spray 41 Winding die 42 Winding core 43 Cutting machine T Plate thickness W1, W2 Plate width G Gap D1 Outer diameter D2 Inner diameter K Area L1, L2 Predetermined length H1 H2 Height

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Takahashi 3-16-16 Toyosu, Koto-ku, Tokyo Ishikawa-Shimaharima Heavy Industries, Ltd. Tokyo Engineering Center (72) Inventor Takeshi Kuwata 3-chome Toyosu, Koto-ku, Tokyo No. 2-16 Ishikawa Shima-Harima Heavy Industries, Ltd. Tokyo Engineering Center (72) Inventor Suneya 3-2-1 Toyosu Koto-ku, Tokyo Ishikawa Shima-Harima Heavy Industries Co., Ltd. Tokyo Engineering Center F-term (reference) 3J102 AA01 BA03 BA17 CA16 CA29 DA03 DA09 DA16 DA30 GA08 5H607 AA00 BB01 CC01 GG21

Claims (4)

[Claims] 1. A stator, which is mounted in a casing that surrounds a rotating rotor in a floating state and has a U-shaped cross-sectional shape, is provided with a stator core coil disposed adjacent to each other in the axial direction. A homopolar magnetic bearing structure to be configured, wherein the lamination direction of the steel plates in the laminated state at the tooth ends of the stator core formed of laminated steel plates is arranged in a direction orthogonal to the axial direction of the rotor. A magnetic bearing structure. 2. The stator core according to claim 1, wherein the U-shaped laminated steel sheet is formed by winding and shaping a continuous steel sheet while applying an insulating material to the continuous steel sheet, and then cutting the steel sheet into equal parts. 2. The magnetic bearing structure according to 1. 3. The rotary machine according to claim 1, wherein the stator core performs rotary cutting in a lamination direction and a horizontal direction on a lamination state of steel plates on an inner peripheral surface side of a tooth end arranged in a direction orthogonal to an outer peripheral surface of the rotor.
The magnetic bearing structure according to claim 1, wherein: 4. A stator end mounted on a casing surrounding a rotating rotor in a floating state and having a coil shape of a stator core having a U-shaped cross section, has N and S poles adjacent to each other in the axial direction. A homopolar magnetic bearing structure comprising: (A) winding to a predetermined thickness while applying tension to a steel sheet continuous to a winding die, and applying and bonding an insulating material to the steel sheet during winding and laminating the steel sheet Forming a winding core of steel sheet,
(B) Next, the winding core released from the winding mold is cut into equal parts to form a stator core having a U-shaped laminated plate, and (C) a tooth end of the stator core is formed. A predetermined rotary cutting process is performed in a direction parallel to the laminating direction of the laminated plate on the inner peripheral surface that is orthogonal to the outer peripheral surface of the rotor. (D) Next, a coil is attached to each tooth end of the stator core. Deploy,
A method for manufacturing a magnetic bearing, comprising: