JP2568018B2 - Laminated bending magnet and method for manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated deflecting electromagnet for controlling deflection of accelerated charged particles, and more particularly to a sector type laminated deflecting electromagnet suitable for use in a synchroton and a method for manufacturing the same. .

[0002]

2. Description of the Related Art Generally, an accelerator, especially a synchrotron, is provided with a ring for accelerating charged particles (beams), and this ring has a deflection electromagnet for deflecting the beam. Such a beam deflecting electromagnet is composed of an electromagnet core formed by laminating a plurality of thin steel plates and a coil. In addition to the deflecting magnet, there are bump electromagnets, septum electromagnets, and the like so that stacked electromagnets for performing pattern operation can be used, but these have the same configuration as the deflecting electromagnet. Then, the bending electromagnet is formed by punching thin steel sheets for lamination in advance into a predetermined shape or machining it to form a gap between magnetic poles, and after obtaining a predetermined accuracy in this state, a lamination apparatus or the like is formed. The steel plates are laminated using these, and necessary deformation processing such as pressure processing is performed, at that time, the lamination length is corrected, and then the laminated steel plates are welded, bonded, etc. I was making an iron core for an electromagnet. As a conventional technique of the iron core of a sector type bending electromagnet, there is a technique disclosed in Japanese Patent Application No. 61-156064. The conventional technique will be specifically described with reference to FIGS. 7 and 8. That is, in the deflection electromagnet core 6 shown in the same figure, a thin steel plate 1 is punched to have a C-shaped cross section and has a gap 5 between magnetic poles, and a predetermined number of the steel plates 1 are laminated in the beam deflection angle direction (θ). The end plate 2 and the side plate 3 are integrally fixed thereto by a weld bead 4, and the cross-sectional shape is vertically symmetrical with respect to the horizontal axis O-O 'as shown in FIG. In this case, in the sector type electromagnet core, when the thin steel plates 1 are stacked in the deflection angle direction θ due to the difference in the inner circumference and the outer circumference, the thicknesses of both ends of the respective steel plates 1 are the same. A gap is formed as the air layer 7, and therefore, when the air layer 7 is generated, the space factor of the iron core 6 is reduced by that amount, which causes variations in the multipole component magnetic field and the deflection angle for each electromagnet. In order to prevent this, iron plate spacers 8a and 8b are inserted in the air layer 7. Further, in the wide space of the gap 5 between the magnetic poles, as shown in FIG.
As shown in (1), the coil 9 is arranged and the beam duct 10 for passing the beam through the narrow portion is installed.

[0003]

By the way, in the synchrotrons up to now, the magnetic field of the multi-pole component, the variation of the deflection angle for each electromagnet, and the like were within the range that the conventional technique can sufficiently cope with. In that case, a higher space factor is required. However, in the iron core of the sector type deflection electromagnet formed by stacking the thin steel plates 1 in the longitudinal direction of the iron core 6 in the sector type, the rolled steel plate forming this has a thickness deviation called edge drop,
Although the gap generated at the end of the iron core due to the deviation is reduced by inserting the iron core spacers 8a and 8b,
It is not possible to completely eliminate the gap that occurs at the end of the core. In particular, unlike the iron core 6 of the bending electromagnet, the gaps generated inside the iron core cannot be completely filled with the iron core spacers 8a and 8b, and this is not possible even in the iron core of the linear bending electromagnet. That is, since the gap shape is a complicated shape depending on the manufacturing conditions and the like, it is substantially impossible to process the iron plate spacers 8a and 8b to that shape each time, so the gap is completely filled. It cannot be done, and it will inevitably become an iron core with a low space factor. In particular, when the iron core 6 is used in an accelerator such as a therapeutic synchrotron,
Since the bending electromagnet has an important function of directly determining the design trajectory of the charged particle beam moving in the synchrotron, when the above-mentioned defect (decrease in space factor) occurs in the electromagnet core, the space factor is reduced. There are problems such as generation of irregular quadrupole component, distortion of design trajectory due to variation of each electromagnet, and reduction of beam stable acceleration space.

The object of the present invention is to eliminate the gap (air layer) in the iron core even if a predetermined number of laminated steel plates are laminated, and further improve the space factor to reduce irregular quadrupole components and the like. To provide a laminated bending electromagnet capable of
Another object is to provide a laminated bending electromagnet that can be reliably manufactured.

[0005]

In the laminated deflecting electromagnet of the present invention, a laminated steel sheet is formed in a tapered shape whose thickness gradually decreases from the outer peripheral arc surface side of the sector core to the inner peripheral arc surface. There is. Further, in the method for manufacturing a laminated deflecting electromagnet of the present invention, a laminated steel plate, a taper step of forming a taper shape, the thickness of which gradually becomes narrower from the outer peripheral arc surface side of the sector core to the inner peripheral arc surface side,
A forming step of forming a sector type iron core by stacking a predetermined number of the laminated steel plates in the thickness direction.

[0006]

According to the present invention, when a predetermined number of laminated steel plates are stacked on each other to form a sector type iron core, the thickness of the laminated steel plates gradually decreases from the outer peripheral circular arc surface side to the inner peripheral circular arc surface as described above. Since it has a shape, the laminated steel sheets can be closely stacked, and at the same time, even if an iron core gap occurs, the iron core gap can be made as small as possible, so that the space factor of the iron core is reduced accordingly. It can be improved more reliably. Further, in the method of the present invention, as described above, a laminated steel sheet is formed by a taper process in which the thickness of the laminated steel sheet is gradually reduced in advance from the outer circumferential arc surface side of the sector core to the inner circumferential arc surface side, and the laminated steel sheet. And a forming step of forming a sector type iron core by stacking a predetermined number of them on each other in the thickness direction, the laminated bending electromagnet can be reliably manufactured.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 show a first embodiment of a laminated bending electromagnet according to the present invention, in which the same reference numerals as those in FIGS. 7 and 8 represent the same or corresponding ones. The deflection electromagnet of the embodiment has an iron core 6 whose cross section is punched into an H shape, as shown in FIG. In the iron core 6, the thin laminated steel plate 1 is punched into an H shape,
The laminated steel plates 1 are stacked on each other along the beam deflection angle direction, and the side plates 3 are fixed to the outer peripheral arc surface side A and the inner peripheral arc surface side B of the stacked laminated steel plates 1 by welding beats 4, respectively, A sector type is formed by fixing the end plates 2 to both end faces in the beam deflection angle direction with welding beats 4. Therefore, this deflecting electromagnet has the laminated steel plates 1 and the iron core 6 for laminating a predetermined number of the laminated steel plates 1 in the deflection angle direction. The laminated steel sheets 1 are tapered so that the thickness dimensions at both ends are not the same but different. That is, as shown in FIG. 1B, when the thickness of the outer end of the iron core 6 defining the outer peripheral arc surface side A of the iron core is about 0.5 mm, the inner peripheral arc surface side B is The thickness of the defining inner end is reduced to about 0.4 mm, and therefore the thickness becomes smaller from the outer peripheral arc surface side A to the inner peripheral arc surface side B, so that there is a difference in the thickness dimension of both ends. The core gap (air layer) is prevented from being generated as much as possible when laminated. In this case, the laminated steel plates 1 are formed in a tapered shape by providing inclined surfaces 1a and 1b on both surfaces.

In order to manufacture the iron core 6 of such a bending electromagnet, first, a plurality of laminated steel plates 1 are punched into a desired shape. Actually, however, a beam duct (not shown) for passing the charged particle beam into the iron core gap. ) Is installed, the laminated steel plate 1 is divided into two upper and lower blocks with a horizontal axis OO ′ shown in FIG. 1 (c) as a boundary into an almost E shape, and the E shape is shown in FIG. Punch as shown in a). In this case, the laminated steel plate 1 is formed in advance by providing slopes 1a and 1b on both sides as shown in FIG. 1 (b). Then, after the surface of the punched laminated steel sheet 1 is subjected to insulation treatment, the laminated steel sheet 1
As shown in FIGS. 2B and 2C, a predetermined number of sheets are stacked on each other along the deflection angle direction. This is performed for each block. Then, as shown in FIG. 2D, the side plate 3 is pressed against the laminated steel plates 1 stacked in each block, and this is pressed and fixed using a pressing device or the like. Further, as shown in FIG. 2E, the sector type side plates 3 are pressed against the upper surface and the side surface of the laminated steel sheet 1 while being pressed and fixed, and are welded by the welding beats 4, so that each block The laminated steel plate 1 is manufactured. As a result, the sector block iron cores 6A and 6B are formed. Then, a predetermined object such as a beam duct (not shown) is installed between the laminated steel plates 1 of each block, and then the laminated steel plates 1 of the upper and lower blocks are attached to each other as shown in FIG.
The end plates 2 are abutted as shown in FIG. 2 and the end plates 2 are welded with a welding beat 4 or the like to form the iron core 6 of the sector type bending electromagnet.

That is, in the laminated bending electromagnet of the embodiment, when a predetermined number of laminated steel plates 1 are stacked on each other to form a sector type iron core 6, the thickness of the laminated steel plate 1 is changed from the outer peripheral arc surface side of the iron core 6 to the inner peripheral arc surface. Since it has a taper shape that gradually becomes narrower as it gets closer, the laminated steel sheets can be closely stacked, and at that time, even if an iron core gap occurs, the iron core gap can be made as small as possible. The space factor of the iron core 6 can be more reliably improved. Moreover, since the iron core gap can be reduced, the amount of iron plate spacers used can be significantly reduced, and the number of working steps can be reduced. Further, in the manufacturing process of the laminated deflection electromagnet, a taper step of forming the laminated steel sheet 1 in a tapered shape and a forming step of forming the iron core 6 by stacking the tapered laminated steel sheets 1 on each other in the deflection angle direction. Therefore, the sector type iron core 6 can be reliably manufactured. According to the present embodiment, the iron core 6 is formed by the laminated steel plate 1 having a tapered shape with one end having a size of 0.5 mm and the other end having a size of 0.4 mm, and a bending electromagnet is formed by using the iron core 6. In this case, as compared with the conventional technique using laminated steel sheets having the same thickness, the space factor of the sector core is 95% and the magnetic field distribution obtained by the magnetic field analysis has an accuracy of 1 × 10 to ^{3 in} the related art. It was 97.
It was confirmed that the space factor can be improved to 5%, and thereby the magnetic field distribution can be improved to ± 2 × 10 to ⁴ .

3 and 4 show a second embodiment of the bending electromagnet according to the present invention. In this embodiment, the width dimension of the laminated steel sheet 1 forming the iron core 6 is large, and it is difficult to process the laminated steel sheet 1 into a taper shape at one time.
That is, in this case, the laminated steel plate 1 is divided into upper and lower blocks about the horizontal axis O-O 'as shown in FIG. 3, and the laminated steel plate 1 is laterally centered on the vertical axis P-P'. It will be divided into four blocks, and the shape will be divided into four on the left and right under the accounting.
At that time, as shown in FIG. 4A, the thickness of the end of the outer circular arc surface of one of the laminated steel plates 10A and 11A to be divided in the width direction in each block is set to 0.5 mm, and the end of the inner circumference is The thickness is 0.45 mm and it is formed in a taper shape.
As shown in FIG. 5, the other laminated steel plates 10B and 11B are formed in a tapered shape with the outer end portion having a thickness of 0.45 mm and the inner circumferential arc surface having an end portion having a thickness of 0.4 mm. Then, each block is formed by stacking a predetermined number of the divided laminated steel plates 10A, 10B, 11A, 11B along the deflection angle direction, and thereafter, each of these blocks is formed as shown in FIG.
Sector type iron core 6 by abutting as shown in
To form. According to this embodiment, when the width dimension of the laminated steel sheet 1 is large, the laminated steel sheet 1 is divided in the width direction, and
Each of the divided laminated steel plates 1 is formed into a taper shape, and the sector-shaped iron core 6 is formed by stacking the tapered laminated steel plates 1. Therefore, even when the width of the laminated steel plate 1 is large, the sector-shaped iron core 6 is surely formed. It is possible to obtain the same effects as those of the first embodiment.

FIGS. 5 and 6 respectively show still another embodiment according to the present invention. The embodiment of FIG. 5 is applied when the deflection radius of the electromagnet is large (the deflection angle is small). That is, in this case, an iron core having a small deflection angle is formed by combining the laminated steel sheet 1 having both ends formed in a tapered shape and the ordinary laminated steel sheet 21 not formed in a tapered shape. Is. Therefore,
According to this embodiment, even a small deflection angle can be easily manufactured, and if the usage amount of the tapered laminated steel sheet 1 is adjusted according to the size of the deflection angle, sectors corresponding to various deflection angles can be obtained. Can make a mold iron core.

In the embodiment shown in FIG. 6, when an iron core is formed by using a laminated steel sheet 1 that has been tapered, a thickness deviation (edge drop) occurs in the rolling process of the laminated steel sheet 1. Therefore, an iron plate spacer is used. Even if it is adjusted, an air layer may be undesirably generated. Therefore, a filling material 71 containing iron powder is used, and the filling material 71 is filled in the air layer portion to achieve a high space factor of the iron core. In particular, the occurrence of the irregular quadrupole magnetic field in the horizontal magnetic field distribution of the iron core cross section is considered to be due to the unevenness of the iron core space factor in the longitudinal direction at the horizontal position of the iron core cross section. Changing the mixing ratio of the powder can suppress unevenness in the space factor of the iron core, which is extremely effective. Moreover, if an adhesive is used as the filling material 71,
Since the rigidity of the entire iron core can be increased by the adhesive, it is also advantageous in strength.

In each of the illustrated embodiments, an example is shown in which both sides of the laminated steel plate 1 are shaved to form a taper shape. However, for example, only one surface is shaved to form a taper shape, and It is also possible to stack the laminated steel plates 1 on top of each other to form a sector core. Generally, laminated steel sheet 1
The surface of the laminated steel sheet is subjected to an insulation treatment, and the laminated steel sheet subjected to the insulation treatment is stacked. However, as described above, when only one surface of the laminated steel sheet 1 is formed in a tapered shape, the tapered surface is adjacent to the adjacent laminated steel sheet. When it is stacked on the insulating surface that is not formed in the taper shape, the insulation between the laminated steel sheets can be secured. Therefore, it is not necessary to insulate one of the tapered surfaces one by one. If the iron core is formed of this laminated steel sheet, the labor of the insulating treatment can be saved and the iron core can be manufactured so much. .

[0014]

As described above, according to the first and second aspects of the present invention, the laminated steel plates are formed in a tapered shape, and the tapered laminated steel plates are used to form the iron core. Therefore, the laminated steel sheets can be closely stacked along the deflection angle, and the core gap can be made as small as possible. As a result, the space factor of the iron core can be improved more reliably. There is an effect that various problems such as generation of components, distortion of design trajectory due to variation of each electromagnet, reduction of beam stable acceleration space, and the like can be suppressed. In particular, claim 1 can significantly reduce the amount of iron plate spacers used, The work man-hour can be reduced by that much, and claim 2
Can easily form an iron core having a small deflection angle. Also,
According to the third aspect, since the filler containing the magnetic powder is used, the space factor can be further increased, and according to the fourth aspect, the insulation between the laminated steel sheets can be secured, so that the iron core can be manufactured more easily. Becomes Therefore, it is possible to easily manufacture a sector type laminated bending electromagnet having a high-precision magnetic field distribution, so that the end portion magnetic field converging effect (edge) obtained by using the linear bending electromagnet is improved.
There is also a side effect that it is possible to design a simple synchrotron electromagnet without having to consider the focus. According to Claims 5 and 7, the laminated bending electromagnet according to Claims 1 and 2 can be reliably manufactured, and according to Claim 6, even if the width of the laminated core is large, it can be easily and reliably manufactured. There is. According to claim 8, claims 5 to 7
In addition to the above effect, the third aspect can be realized, and according to the ninth aspect, the rigidity of the entire iron core is increased accordingly, so that the strength can be increased accordingly.

[Brief description of drawings]

FIG. 1 shows a first embodiment of a laminated bending electromagnet according to the present invention, showing a plan view of the entire iron core (a), an explanatory plan view of a laminated steel plate (b), and a sectional view taken along the line I-I of FIG. (C).

FIG. 2 is an explanatory view sequentially showing a process of forming an iron core.

FIG. 3 is a sectional view for explaining a second embodiment of the laminated bending electromagnet according to the present invention and corresponding to FIG. 1 (c).

FIG. 4 shows the thickness of the laminated core corresponding to FIG. 1 (b),
Explanatory drawing (a) which shows the left half in FIG. 3, and explanatory drawing (b) which similarly shows the right half.

FIG. 5 is an explanatory view of a main part showing another embodiment of the laminated bending electromagnet.

FIG. 6 is an explanatory view of a main part showing still another embodiment of the laminated bending electromagnet.

FIG. 7 is a plan view showing a configuration example of a conventional laminated bending electromagnet.

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Laminated steel plate, 1a, 1b ... Tapered slope, 6 ... Iron core, 7 ... Iron core gap (air layer), 10A, 10B, A
… Both the outer peripheral arc surface of the iron core, B… the inner arc surface of the iron core.

Claims (9)

(57) [Claims] 1. A laminated deflection electromagnet having a laminated steel sheet formed in a desired shape and a sector type iron core formed by laminating a predetermined number of the laminated steel sheets on each other in a deflection angle direction, wherein the laminated steel sheets have respective thicknesses. Of the sector type iron core has a taper shape which gradually becomes narrower from the outer peripheral circular arc surface side to the inner peripheral circular arc surface. 2. A laminated bending electromagnet having a laminated steel sheet formed in a desired shape and a sector type iron core formed by stacking a predetermined number of the laminated steel sheets on each other in a deflection angle direction. It consists of a laminated steel plate that is formed in a tapered shape that gradually narrows from the outer peripheral circular arc surface side of the mold to the inner peripheral circular arc surface side, and a laminated steel plate with the same thickness dimension at both ends. A laminated bending electromagnet, which is formed by appropriately laminating the same laminated steel sheets with each other to form a laminated iron core. 3. The laminated deflecting electromagnet according to claim 1, further comprising a filler which is arranged in an air layer between the laminated steel plates and which contains a magnetic material. 4. The laminated bending electromagnet according to claim 1, wherein the tapered laminated steel plate is formed by providing an inclined surface on one surface. 5. A method for manufacturing a laminated deflection electromagnet, wherein a predetermined number of laminated steel sheets are stacked on each other in a deflection angle direction to form a sector type iron core. Lamination characterized in that it has a taper step of forming a taper shape that becomes gradually narrower toward the inner circumferential arc surface side, and a forming step of forming a sector type iron core by laminating a predetermined number of the laminated steel plates in the thickness direction. Bending electromagnet manufacturing method. 6. A method of manufacturing an electromagnet in which a predetermined number of laminated steel plates are stacked on each other in the deflection angle direction to form a sector type iron core, the laminated steel plates are divided into a plurality of blocks in advance along the width direction, and the blocks are divided into blocks. A taper process in which each laminated steel core is formed into a tapered shape in which the thickness of each laminated iron core gradually becomes narrower from the outer peripheral arc surface side to the inner peripheral arc surface side of the sector core, and each laminated steel plate is block by block. A method for manufacturing a laminated deflection electromagnet, characterized by having a step of stacking in a thickness direction and a forming step of forming a sector type iron core by abutting block laminated steel sheets laminated for each block in a width direction of the laminated steel sheets. . 7. A method for manufacturing an electromagnet in which a predetermined number of laminated steel plates are stacked on each other in the deflection angle direction to form a sector-type iron core, wherein the laminated steel plates are preliminarily made to have an inner circular arc whose thickness is from the outer circumferential arc surface side of the sector-shaped iron core. A taper process that forms a taper shape that gradually narrows toward the surface side and a tapered laminated steel plate formed by the taper process and a laminated steel plate having the same thickness at both ends are stacked as appropriate to form an iron core. A method of manufacturing a laminated bending electromagnet, comprising: a forming step. 8. The method according to claim 5, wherein when an air layer is formed between the laminated steel sheets, there is a step of filling the air layer with a filler mixed with a magnetic material. A method for manufacturing the laminated bending electromagnet described. 9. The method for manufacturing a laminated deflecting electromagnet according to claim 8, wherein an adhesive containing a magnetic material is used as the filling material.