Mounting structure, fastening method, manufacturing method of mounting structure, electromagnet system, and particle beam therapy apparatus

Abstract

The present invention provides a mounting structure, fastening method, manufacturing method of the mounting structure, electromagnet system, and particle beam therapy apparatus that can suppress the increase in magnetic resistance of electromagnets and improve productivity. [Solution] In the mounting structure 50, the magnetic body 3 has a hole 46 that extends in the stacking direction. A part of the fastening means 60 is also arranged in the hole 46. For example, if a configuration is adopted in which a hole is formed in a direction perpendicular to the stacking direction and a bolt or the like is directly screwed into the hole, problems such as stacking cracks will occur. In contrast, by making the hole 46 extend in the stacking direction, stacking cracks can be suppressed. Also, the side plates 40 and 41 are attached to the magnetic body 3 by fastening with the fastening means 60. In this way, the side plates 40 and 41 can be fixed to the magnetic body 3 by the fastening means 60 instead of by welding. Therefore, the increase in magnetic resistance of the electromagnet 30 due to the effect of welding can be suppressed, and the decrease in productivity due to welding can be suppressed.

Description

Technical Field

[0001] The present invention relates to an attachment structure, a fastening method, a method for manufacturing an attachment structure, an electromagnetic system, and a particle beam therapy apparatus.

Background Art

[0002] Conventionally, as a particle beam therapy apparatus that performs treatment by irradiating a particle beam to an affected part of a patient, for example, an apparatus described in Patent Document 1 is known. In the particle beam therapy apparatus described in Patent Document 1, the particle beam is irradiated from an irradiation unit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a particle beam therapy apparatus as described above, an electromagnetic system for deflecting a particle beam is used. Such an electromagnetic system includes a coil that generates a magnetic field for deflecting a particle beam, and a magnetic body disposed in an opening on the inner peripheral side of the coil. Such a magnetic body may be configured by laminating a plurality of laminated steel plates. Here, a magnetic body using laminated steel plates may have constraints in hole processing, etc., and a tap hole for holding and fixing an electromagnet may be separately drilled in a solid side plate, and the plate may be welded to the electromagnet. However, when welding the side plate, there was a problem that deterioration of magnetic characteristics due to heat caused an increase in magnetic resistance. Therefore, it was necessary to design the electromagnet slightly larger in consideration of the influence. Therefore, it has been required to suppress an increase in magnetic resistance of the electromagnet and improve productivity by omitting welding.

[0005] Accordingly, the present invention aims to provide a mounting structure, a fastening method, a method for manufacturing the mounting structure, an electromagnet system, and a particle beam therapy apparatus that can suppress the increase in magnetic resistance of an electromagnet and improve productivity. [Means for solving the problem]

[0006] One aspect of the present invention relates to a mounting structure in which a side plate is attached to a magnetic material of an electromagnet, wherein the magnetic material is constructed by stacking a plurality of laminated steel plates in the stacking direction and has holes extending in the stacking direction, a part of the fastening means is arranged in the holes, and the side plate is attached to the magnetic material by fastening with the fastening means.

[0007] In the mounting structure, the magnetic material has holes that extend in the stacking direction. Part of the fastening means is positioned within these holes. For example, if holes extending perpendicular to the stacking direction are formed and bolts are directly screwed into these holes, problems such as stack cracking can occur. However, by making the holes extend in the stacking direction, stack cracking can be suppressed. Furthermore, the side plates are attached to the magnetic material by fastening with the fastening means. Thus, the side plates can be fixed to the magnetic material by fastening means rather than by welding. Therefore, the increase in the magnetic resistance of the electromagnet due to welding is suppressed, and the decrease in productivity due to welding is suppressed. As a result, the increase in the magnetic resistance of the electromagnet can be suppressed, and productivity can be improved.

[0008] The magnetic material has a communication hole that extends from the side in a direction intersecting the stacking direction and communicates with the hole, and a bolt of fastening means may be inserted into the communication hole. As a result, the side plate can be fastened to the side by inserting the bolt through the communication hole.

[0009] The holes may be located at the outer edge of the magnetic material. This makes it possible to place the holes where the magnetic flux is small, thereby suppressing the increase in magnetic resistance.

[0010] A fastening method according to one aspect of the present invention is a fastening method for fastening a side plate to a magnetic material of an electromagnet, wherein the magnetic material is constructed by stacking a plurality of laminated steel plates in the stacking direction, a hole extending in the stacking direction is formed in the magnetic material, a part of the fastening means is placed in the hole, and the side plate is fastened to the magnetic material with the fastening means.

[0011] This fastening method allows for the same function and effect as the mounting structure described above to be obtained.

[0012] A hole can be formed by pre-forming through-holes in laminated steel sheets and then laminating multiple laminated steel sheets to connect the through-holes to each other. In this case, the processing work for the holes after lamination can be omitted, thus suppressing laminate cracking and other problems.

[0013] Holes may be formed in the magnetic material of the laminated steel sheet after lamination by processing. In this case, the processing effort of the laminated steel sheet can be reduced compared to when the shape corresponding to the hole is pre-processed in the laminated steel sheet.

[0014] By processing the magnetic material of the laminated steel sheet after lamination, communication holes can be formed that extend from the side in a direction intersecting the lamination direction and communicate with the holes. In this case, the processing effort of the laminated steel sheet can be reduced compared to when the laminated steel sheet is pre-processed with a shape corresponding to the communication holes.

[0015] A method for manufacturing a mounting structure according to one aspect of the present invention is a method for manufacturing a mounting structure in which a side plate is attached to a magnetic material of an electromagnet, wherein the magnetic material is constructed by stacking a plurality of laminated steel plates in the stacking direction, a hole extending in the stacking direction is formed in the magnetic material, a part of the fastening means is placed in the hole, and the side plate is fastened to the magnetic material with the fastening means.

[0016] An electromagnetic system according to one aspect of the present invention is an electromagnetic system including a coil, an electromagnet having a magnetic body, and a side plate attached to the magnetic body. The magnetic body is formed by laminating a plurality of laminated steel plates in the lamination direction, has a hole portion extending in the lamination direction, and a part of fastening means is disposed in the hole portion. The side plate may be attached to the magnetic body by being fastened with the fastening means.

[0017] A particle beam therapy apparatus according to one aspect of the present invention is a particle beam therapy apparatus that irradiates a subject with a particle beam, and includes an electromagnetic system that deflects the particle beam. The electromagnetic system includes a coil, an electromagnet having a magnetic body, and a side plate attached to the magnetic body. The magnetic body is formed by laminating a plurality of laminated steel plates in the lamination direction, has a hole portion extending in the lamination direction, and a part of fastening means is disposed in the hole portion. The side plate is attached to the magnetic body by being fastened with the fastening means.

[0018] According to these manufacturing methods of the mounting structure, the electromagnetic system, and the particle beam therapy apparatus, the same operations and effects as those of the above-described mounting structure can be obtained.

Effect of the Invention

[0019] According to the present invention, it is possible to provide a mounting structure, a fastening method, a manufacturing method of the mounting structure, an electromagnetic system, and a particle beam therapy apparatus that can suppress an increase in the magnetic resistance of an electromagnet and improve productivity.

Brief Description of the Drawings

[0020] [Figure 1] It is a schematic configuration diagram showing a particle beam therapy apparatus according to an embodiment of the present invention. [Figure 2] It is a schematic configuration diagram showing an accelerator. [Figure 3] It is a perspective view of an electromagnet. [Figure 4] It is a schematic cross-sectional view of a mounting structure. [Figure 5] It is a plan view showing a communication hole. [Figure 6] It is a view showing a laminated steel plate. [Figure 7] It is a schematic cross-sectional view showing an attachment structure according to a modified example.

Embodiments for Carrying out the Invention

[0021] Hereinafter, an accelerator according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are given to the same elements, and duplicate descriptions are omitted.

[0022] FIG. 1 is a schematic configuration diagram showing a particle beam therapy apparatus 101 according to an embodiment of the present invention. The particle beam therapy apparatus 101 is a system used for cancer treatment and the like by radiation therapy. The particle beam therapy apparatus 101 includes an accelerator 100 that accelerates charged particles generated by an ion source device and emits them as a particle beam, an irradiation unit 102 that irradiates a subject with the particle beam, and a transport path 131 that transports the particle beam emitted from the accelerator 100 to the irradiation unit 102. The irradiation unit 102 is attached to a rotating gantry 105 provided so as to surround a treatment table 104. The irradiation unit 102 is rotatable around the treatment table 104 by the rotating gantry 105.

[0023] The accelerator 100 is a device that accelerates charged particles and emits a particle beam having a preset intensity. Examples of the accelerator 100 include a cyclotron, a synchrocyclotron, and the like. The particle beam generated by the accelerator 100 is transported to the irradiation unit 102 by the transport path 131.

[0024] The irradiation unit 102 irradiates tumors within the patient's (irradiated body) body with a particle beam. A particle beam is a charged particle accelerated to high speed, such as a proton beam, heavy ion beam, or electron beam. Specifically, the irradiation unit 102 is a device that irradiates tumors 114 with a particle beam emitted from an accelerator 100 that accelerates charged particles generated by an ion source (not shown) and transported through a transport path 131. The irradiation unit 102 irradiates with the particle beam using a scanning method. The scanning method is not particularly limited, and line scanning, raster scanning, spot scanning, etc., may be used. Furthermore, the irradiation method of the irradiation unit 102 is not limited to the scanning method.

[0025] The irradiation unit 102 includes a scanning electromagnet 150, various monitors 151, etc. The scanning electromagnet 150 consists of an X-axis scanning electromagnet 150X and a Y-axis scanning electromagnet 150Y. The X-axis scanning electromagnet 150X and Y-axis scanning electromagnet 150Y constitute an electromagnet system 1, which changes the magnetic field of the electromagnet system 1 in accordance with the current supplied from the control unit 7, scanning the particle beam passing through the electromagnet system 1. The X-axis scanning electromagnet 150X scans the particle beam in the X-axis direction, and the Y-axis scanning electromagnet 150Y scans the particle beam in the Y-axis direction. The scanning electromagnet 150 scans the particle beam so that it is irradiated according to a scan pattern pre-planned by the treatment planning device.

[0026] The transport path 131 connects the accelerator 100 and the output port of the irradiation unit 102, transporting the particle beam emitted from the accelerator 100 to the irradiation unit 102. The transport path 131 has a beam adjustment unit 130 that adjusts the beam size, beam position, beam symmetry, and transmission efficiency of the particle beam. The beam adjustment unit 130 is equipped with multiple electromagnets. The beam adjustment unit 130 includes a quadrupole electromagnet for adjusting the beam size, a deflection electromagnet for adjusting the beam position, and the like.

[0027] The electromagnet system 1 described later can be applied to the scanning electromagnet 150 of such a particle beam therapy device 101. However, any electromagnet that deflects the particle beam in the particle beam therapy device 101 can be used with the electromagnet system 1 described later.

[0028] Figure 2 is a schematic diagram showing the accelerator 100. The accelerator 100 is a device that accelerates charged particles and emits a particle beam B of a predetermined intensity. Examples of accelerators 100 include cyclotrons, synchrotrons, and synchrocyclotrons. Figure 2(a) shows a cyclotron 110 as an example of accelerator 100. The cyclotron 110 has an acceleration space sandwiched between a pair of magnetic poles within a vacuum vessel 111. Coils are arranged around the magnetic poles to form a magnetic field between them. The cyclotron 110 generates an electric field in the acceleration space to accelerate charged particles using a deelectrode. As a result, the cyclotron 110 generates a particle beam B by accelerating the charged particles by causing them to spiral in the acceleration space. The cyclotron 110 deflects the particle beam B with an electromagnet system 1 and emits it from the outlet 112. In the cyclotron 110, the electromagnet system 1 is used to deflect the accelerated particle beam B.

[0029] Figure 2(b) shows a synchrotron 120 as an example of accelerator 100. The synchrotron 120 injects accelerated particles into a ring-shaped orbit 121, deflects them with an electromagnet system 1, makes them orbit 121, and accelerates them in an accelerating cavity 122. The synchrotron 120 emits a sufficiently accelerated particle beam B from an exit port 123. In the synchrotron 120, the electromagnet system 1 is used to deflect the particle beam B in the orbit for acceleration. Note that the application of the electromagnet system 1 is not limited to those described above, and can be applied to transformers, motor cores, generators, etc.

[0030] Next, the configuration of the electromagnet system 1 will be described with reference to Figure 3. Figure 3 is a perspective view of the electromagnet system 1. For the purpose of explanation, XYZ coordinates will be set. The Z-axis direction is set parallel to the axis along which the beam axis CL of particle beam B extends. The beam axis CL will be described as the axis when the electromagnet system 1 is not deflected. The X-axis direction is perpendicular to the Z-axis direction. The Y-axis direction is perpendicular to both the X-axis and Y-axis directions. As shown in Figure 3, the electromagnet system 1 comprises an electromagnet 30 and side plates 40, 41. The electromagnet 30 comprises coils 2A, 2B and a magnetic material 3.

[0031] Coils 2A and 2B generate a magnetic field that deflects particle beam B. Coils 2A and 2B are positioned opposite each other, spaced apart in the Y-axis direction. Coil 2A is positioned on the positive side of the Y-axis direction. Coil 2B is positioned on the negative side of the Y-axis direction. The beam axis CL of particle beam B is set in the space between coils 2A and 2B. In this space, the beam axis CL is positioned in the center in the X-axis direction.

[0032] Coils 2A and 2B are saddle-shaped coils. Coils 2A and 2B are formed by bending both ends in the longitudinal direction of a rectangular, annular, racetrack-shaped coil having its longitudinal direction in the Z-axis direction. Coils 2A and 2B are constructed by winding a conductor multiple times. Coils 2A and 2B have a pair of coil-side ends 4, 4 extending in the Z-axis direction, which is the longitudinal direction, and a pair of coil-side ends 6, 6 at both ends in the Z-axis direction. The coil-side ends 4, 4 are spaced apart from each other in the X-axis direction and extend parallel to the Z-axis direction. An opening is formed between the coil-side ends 4, 4, penetrating in the Y-axis direction. The coil-side ends 6, 6 are spaced apart from each other in the Z-axis direction and extend parallel to the X-axis direction.

[0033] Furthermore, coils 2A and 2B have bent portions 8, 8 at both ends in the Z-axis direction that bend in the Y-axis direction, which is intersecting the axial direction. The bent portions 8, 8 of coil 2A bend towards the positive side in the Y-axis direction. The bent portion 8 comprises a pair of coil-side ends 9, 9 and the aforementioned coil end 6. The coil-side ends 9, 9 extend from the Z-axis direction ends of the aforementioned coil-side ends 4, 4 towards the positive side in the Y-axis direction. The corner between the coil-side ends 9, 9 and the coil-side ends 4, 4 is curved. The positive Y-axis direction ends of the coil-side ends 4, 4 are connected by the coil end 6. With this configuration, an opening SP2 is formed in the bent portion 8 between the beam axis CL and the coil end 6. The opening SP2 is formed between the pair of coil-side ends 9, 9. The opening SP2 is a space that communicates with the opening SP1 between the coil-side ends 4, 4. The bent portions 8, 8 of coil 2B bend towards the negative side in the Y-axis direction. Except for the bending direction of the bent portions 8,8 of coil 2B, it has the same configuration as coil 2A.

[0034] The magnetic material 3 is a component arranged around the coils 2A and 2B. The magnetic material 3 includes a yoke portion 11.

[0035] The yoke portion 11 extends in the axial direction along which the beam axis CL of the particle beam B extends. The yoke portion 11 has a rectangular annular shape when viewed from the Z-axis direction. The yoke portion 11 has end wall portions 21A and 21B extending in the X-axis direction and connecting wall portions 23A and 23B extending in the Y-axis direction.

[0036] The end wall portion 21A is positioned on the positive side in the Y-axis direction relative to the coil 2A. The end wall portion 21B is positioned on the negative side in the Y-axis direction relative to the coil 2B. The end walls 21A and 21B are configured to extend outward on the positive and negative sides in the X-axis direction compared to the coils 2A and 2B. The connecting wall portion 23A extends in the Y-axis direction to connect the positive ends in the X-axis direction of the end walls 21A and 21B. The connecting wall portion 23A is positioned on the positive side in the X-axis direction of the coils 2A and 2B. The connecting wall portion 23B extends in the Y-axis direction to connect the negative ends in the X-axis direction of the end walls 21A and 21B. The connecting wall portion 23B is positioned on the negative side in the X-axis direction of the coils 2A and 2B. The yoke portion 11 has a leg portion 26 that extends to the negative side in the Y-axis direction and enters the opening of the coil 2A (see Figure 4).

[0037] The yoke portion 11 has yoke end faces 11a and 11b in the Z-axis direction. The yoke portion 11 has side faces 11c and 11d in the Y-axis direction. The yoke portion 11 has side faces 11e and 11f in the X-axis direction. The yoke end face 11a is formed on the positive side in the Z-axis direction. The yoke end face 11b is formed on the negative side in the Z-axis direction. The yoke end faces 11a and 11b are the Z-axis end faces of the end wall portions 21A and 21B, and the connecting wall portions 23A and 23B. Side face 11c is formed on the positive side in the Y-axis direction. Side face 11d is formed on the negative side in the Y-axis direction. Side face 11e is formed on the positive side in the X-axis direction. Side face 11f is formed on the negative side in the X-axis direction. These surfaces 11a to 11f define the outer shape of the yoke portion 11. The yoke portion 11 may have protrusions 12A and 12B positioned at the openings in the bent portions 8 of the coils 2A and 2B.

[0038] The yoke section 11 has a split structure comprising a split section 11A on the positive side in the Y-axis direction (see also Figure 5) and a split section 11B on the negative side in the Y-axis direction. The split sections 11A and 11B have a vertically symmetrical shape when viewed from the Z-axis direction. Therefore, side plates 40A are attached to the sides 11e and 11f of the split section 11A, and side plates 40B are attached to the sides 11e and 11f of the split section 11B. The side plates 40A and 40B are long, plate-like members that extend in the Z-axis direction. Furthermore, the side plates 40A and 40B of side 11e are connected by a connecting member 42. The side plates 40A and 40B of side 11f are connected by a connecting member 42. The connecting member 42 is a rod-shaped member that extends in the Y-axis direction between the side plates 40A and 40B and is fastened to the side plates 40A and 40B. This connects the split portion 11A and the split portion 11B to each other.

[0039] A side plate 41A is attached to the side surface 11c of the split portion 11A of the yoke portion 11. A side plate 41B is attached to the side surface 11d of the split portion 11B of the yoke portion 11. The side plates 41A and 41B are plate-shaped members that extend parallel to the XZ plane. The side plates 41A and 41B can be used as connecting members to the base and other members connected to the electromagnet 30. In the example shown in Figure 3, the side plate 41A is configured as a single member, but it may be configured as multiple members.

[0040] Here, the yoke portion 11 of the magnetic material 3 is constructed by stacking multiple laminated steel plates 44 in the stacking direction (see Figure 6). In this embodiment, the stacking direction is set to the Z-axis direction. Therefore, multiple laminated steel plates 44 having the shape of a half-split portion 11A when viewed from the Z-axis direction are prepared, and the half-split portion 11A is formed by stacking and fixing them in the Z-axis direction. Multiple laminated steel plates 44 having the shape of a half-split portion 11B when viewed from the Z-axis direction are prepared, and the half-split portion 11B is formed by stacking and fixing them in the Z-axis direction.

[0041] Next, the mounting structure 50 according to this embodiment will be described with reference to Figure 4. Figure 4 is a schematic cross-sectional view of the mounting structure 50. Although only the mounting structure 50 in the split portion 11A is shown in Figure 4, the same configuration applies to the split portion 11B. The mounting structure 50 is a structure in which side plates 40A and 41A are attached to the split portion 11A, which is the magnetic material 3 of the electromagnet 30. Each side plate 40A is fastened to the sides 11e and 11f of the magnetic material 3 by fastening means 60. The side plate 41A is fastened to the side 11c of the magnetic material 3 by fastening means 60.

[0042] The magnetic material 3 has holes 46A, 46B, and 46C extending in the Z-axis direction (stacking direction). Hole 46A is formed at a position spaced apart from the side surface 11e toward the negative side in the X-axis direction. Hole 46A has a rectangular cross-sectional shape extending in the Y-axis direction, but its shape is not particularly limited. Hole 46A is located in the connecting wall portion 23A, closer to the side surface 11e. Therefore, hole 46A is located at the outer end of the magnetic material 3 (the end near the side surface 11e). The magnetic material 3 has a communication hole 47A that extends from the side surface 11e toward the negative side in the X-axis direction intersecting the stacking direction and communicates with hole 46A.

[0043] The hole 46B is formed at a position spaced apart from the side surface 11f toward the positive side in the X-axis direction. The hole 46B has a rectangular cross-sectional shape extending in the Y-axis direction, but its shape is not particularly limited. The hole 46B is located on the connecting wall 23B, closer to the side surface 11f. Therefore, the hole 46B is located on the outer edge end (the end near the side surface 11f) of the magnetic material 3. The magnetic material 3 has a communication hole 47B that extends from the side surface 11f toward the positive side in the X-axis direction intersecting the stacking direction and communicates with the hole 46B.

[0044] The hole portion 46C is formed at a position spaced apart from the side surface 11c on the negative side in the Y-axis direction. The hole portion 46C has a rectangular cross-sectional shape extending in the X-axis direction, but its shape is not particularly limited. The hole portion 46C is located on the end wall portion 21A, closer to the side surface 11c. Therefore, the hole portion 46C is located at the outer end of the magnetic material 3 (the end near the side surface 11c). The magnetic material 3 has a communication hole 47C that extends from the side surface 11c on the negative side in the Y-axis direction intersecting the stacking direction and communicates with the hole portion 46C. In the example shown in Figure 4, three holes 46C are provided, but the number is not particularly limited.

[0045] The fastening means 60 includes a bolt 61 and a receiving member 62 into which the bolt 61 is screwed. The receiving member 62, which is part of the fastening means 60, is positioned in the holes 46A, 46B, and 46C. The shaft portion of the bolt 61 of the fastening means 60 is inserted into the communication holes 47A, 47B, and 47C. The tip of the shaft portion of the bolt 61 is screwed into the receiving member 62, passing through the side plates 40A, 41A and the communication holes 47A, 47B, and 47C. As a result, the side plate 40A is fastened to the side surfaces 11e and 11f by being pressed against them by the head of the bolt 61. The side plate 41A is fastened to the side surface 11c by being pressed against it by the head of the bolt 61.

[0046] Here, each fastening means may have a plurality of bolts 61 at predetermined intervals in the Z-axis direction. As shown in Figure 5(a), the communication holes 47C may be formed not only at the locations where the bolts 61 are inserted, but also in a continuous manner along the Z-axis direction. Alternatively, as shown in Figure 5(b), the communication holes 47C may be formed at predetermined intervals in the Z-axis direction so as to be provided at the locations where the bolts 61 are inserted. The same applies to the communication holes 47A and 47B. The holes 46A, 46B, and 46C may be formed over the entire Z-axis direction of the split portion 11A. In this case, the holes 46A, 46B, and 46C may be formed to penetrate between the yoke end face 11a and the yoke end face 11b. However, as long as the receiving member 62 can be inserted, the holes 46A, 46B, and 46C may be formed in only a part of the Z-axis direction of the split portion 11A. For example, the holes 46A, 46B, and 46C may be open on one of the yoke end faces 11a and 11b, and closed on the other. The receiving member 62 may be positioned to extend continuously along the Z-axis direction, not only at the locations where the bolt 61 is inserted among the holes 46A, 46B, and 46C. Alternatively, the receiving member 62 may be positioned only at the locations of the holes 46A, 46B, and 46C corresponding to the locations where the bolt 61 is inserted.

[0047] A method for forming the holes 46A, 46B, 46C and the connecting holes 47A, 47B, 47C will now be described. As shown in Figure 5, through-holes 49 are formed in advance in the laminated steel plate 44. Each through-hole 49 has a shape that corresponds to the holes 46A, 46B, 46C and the connecting holes 47A, 47B, 47C when viewed from the Z-axis direction. Multiple laminated steel plates 44 are stacked and the through-holes 49 are connected to each other to form the holes 46A, 46B, 46C and the connecting holes 47A, 47B, 47C.

[0048] In the example shown in Figures 4 to 6, receiving members are placed for the holes 46A, 46B, and 46C. Alternatively, as shown in Figure 7(a), the base portion 63 of the anchor bolt 63a may be placed for the holes 46A, 46B, and 46C. The anchor bolt 63a extends upward from the base portion 63, passing through the communication hole 47C and the side plate 41A. By attaching a nut 64 to the anchor bolt 63a, the side plate 41A can be fastened to the side surface 11c.

[0049] As shown in Figure 7(b), a communication hole 47C may be formed by processing the magnetic material 3 after the laminated steel sheets 44 have been laminated, extending from the side surface 11c in a direction intersecting the lamination direction and communicating with the hole 46C. In the example shown in Figure 7(b), the hole 46C is formed by laminating the through portion 49 (see Figure 6) of the laminated steel sheets 44. In contrast, the communication hole 47 is formed by drilling a hole in the magnetic material 3 after lamination.

[0050] Furthermore, as shown in Figure 7(c), holes 46C may be formed by processing the magnetic material 3 after the laminated steel sheets 44 (see Figure 6). As shown in the left-hand diagram of Figure 7(c), the magnetic material 3 immediately after lamination does not have holes 46C. Holes 46C are formed by processing holes at the locations indicated by dashed lines in Figure 7(c). In addition, by processing holes in the magnetic material 3 after the laminated steel sheets 44, communication holes 47C are formed that communicate from the side surface 11c to the holes 46C.

[0051] Next, the mounting structure 50, the fastening method, the manufacturing method of the mounting structure 50, the electromagnet system 1, and the operation and effects of the particle beam therapy device 101 will be described.

[0052] In the mounting structure 50, the magnetic body 3 has a hole 46 that extends in the stacking direction. A part of the fastening means 60 is also positioned in the hole 46. For example, if a configuration is adopted in which a hole is formed in a direction perpendicular to the stacking direction and a bolt or the like is directly screwed into the hole, problems such as stacking cracks will occur. In contrast, by making the hole 46 extend in the stacking direction, stacking cracks can be suppressed. The side plates 40 and 41 are attached to the magnetic body 3 by fastening with the fastening means 60. In this way, the side plates 40 and 41 can be fixed to the magnetic body 3 by the fastening means 60 rather than by welding. Therefore, the increase in the magnetic resistance of the electromagnet 30 due to the effects of welding can be suppressed, and the decrease in productivity due to welding can be suppressed. As a result, the increase in the magnetic resistance of the electromagnet 30 can be suppressed, and productivity can be improved.

[0053] The magnetic material 3 has communication holes 47 that extend from the side surfaces 11c, 11e, and 11f in a direction intersecting the stacking direction and communicate with the hole portion 46, and bolts of the fastening means 60 may be inserted into the communication holes 47. As a result, the side plates 40 and 41 can be fastened to the side surface by inserting bolts through the communication holes 47.

[0054] The hole 46 may be located at the outer edge of the magnetic material 3. This makes it possible to place the hole 46 in an area with low magnetic flux, thereby suppressing an increase in magnetic resistance.

[0055] The fastening method according to this embodiment is a fastening method for fastening side plates 40 and 41 to a magnetic body 3 of an electromagnet 30, wherein the magnetic body is constructed by stacking a plurality of laminated steel plates in the stacking direction, a hole is formed in the magnetic body extending in the stacking direction, a part of the fastening means is placed in the hole, and the side plates are fastened to the magnetic body with the fastening means.

[0056] This fastening method allows for the same function and effect as the mounting structure described above to be obtained.

[0057] A hole 46 can be formed by pre-forming through-holes 49 in the laminated steel sheet 44 and then laminating multiple laminated steel sheets 44 to connect the through-holes 49 to each other. In this case, the processing work for the hole 46 after lamination can be omitted, thus suppressing laminate cracking and other problems.

[0058] The holes 46 may be formed by processing the magnetic material 3 after the laminated steel sheets 44 have been laminated. In this case, the processing effort for the laminated steel sheets 44 can be reduced compared to the case in which the laminated steel sheets 44 are pre-processed to have shapes corresponding to the holes 46.

[0059] By processing the magnetic material 3 after the laminated steel sheets 44 are stacked, communication holes 47 can be formed that extend from the side surfaces 11c, 11e, and 11f in a direction intersecting the stacking direction and communicating with the holes 46. In this case, the effort required to process the laminated steel sheets 44 can be reduced compared to the case where the laminated steel sheets 44 are pre-processed with shapes corresponding to the communication holes 47.

[0060] The manufacturing method for the mounting structure 50 according to this embodiment is a method for manufacturing a mounting structure 50 in which side plates 40 and 41 are attached to the magnetic body 3 of an electromagnet 30, wherein the magnetic body 3 is constructed by stacking a plurality of laminated steel plates 44 in the stacking direction, a hole portion 46 extending in the stacking direction is formed in the magnetic body 3, a part of the fastening means 60 is placed in the hole portion 46, and the side plates 40 and 41 are fastened to the magnetic body 3 with the fastening means 60.

[0061] The electromagnet system 1 according to this embodiment comprises an electromagnet 30 having coils 2A, 2B and a magnetic body 3, and side plates 40, 41 attached to the magnetic body 3, wherein the magnetic body 3 is constructed by stacking a plurality of laminated steel plates 44 in the stacking direction and has holes 46 extending in the stacking direction, a part of the fastening means 60 is arranged in the holes 46, and the side plates 40, 41 may be attached to the magnetic body 3 by fastening with the fastening means 60.

[0062] The particle beam therapy apparatus 101 according to this embodiment is a particle beam therapy apparatus 101 that irradiates an object to be irradiated with a particle beam, and comprises an electromagnet system 1 for deflecting the particle beam, the electromagnet system 1 comprises coils 2A, 2B, an electromagnet 30 having a magnetic material 3, and side plates 40, 41 attached to the magnetic material 3, the magnetic material 3 is constructed by stacking a plurality of laminated steel plates 44 in the stacking direction, and has a hole portion 46 extending in the stacking direction, a part of the fastening means 60 is arranged in the hole portion 46, and the side plates 40, 41 are attached to the magnetic material 3 by fastening with the fastening means 60.

[0063] According to the manufacturing method of these mounting structures 50, the electromagnet system 1, and the particle beam therapy apparatus 101, the same functions and effects as those of the mounting structure 50 described above can be obtained.

[0064] The present invention is not limited to the embodiments described above.

[0065] For example, the configuration of the electromagnet system shown in Figure 3 is merely an example and may be modified as appropriate without departing from the spirit of the present invention. [Explanation of Symbols]

[0066] 1...Electromagnet system, 2A, 2B...Coil, 3...Magnetic material, 30...Electromagnet, 40, 41...Side plate, 44...Laminated steel plate, 46...Hole, 47...Communication hole, 49...Penetration part, 60...Fastening means, 100...Accelerator, 101...Particle beam therapy device.

Claims

1. A mounting structure in which a side plate is attached to the magnetic material of an electromagnet, The magnetic material is constructed by stacking multiple laminated steel plates in the stacking direction, and has holes extending in the stacking direction. A part of the fastening means is placed in the aforementioned hole. The mounting structure wherein the side plate is attached to the magnetic material by fastening with the fastening means.

2. The magnetic material has a communication hole that extends from the side in a direction intersecting the stacking direction and communicates with the hole portion. The mounting structure according to claim 1, wherein a bolt of the fastening means is inserted into the communication hole.

3. The mounting structure according to claim 1, wherein the hole is located at the outer end of the magnetic material.

4. A fastening method for fastening a side plate to the magnetic material of an electromagnet, The magnetic material is constructed by stacking multiple laminated steel plates in the stacking direction, A hole is formed in the magnetic material that extends in the stacking direction. A portion of the fastening means is placed in the aforementioned hole, A fastening method comprising fastening the side plate to the magnetic material using the fastening means.

5. The fastening method according to claim 4, wherein a through portion is formed in the laminated steel plate in advance, and the hole is formed by stacking a plurality of the laminated steel plates and connecting the through portions to each other.

6. The fastening method according to claim 4, wherein the hole is formed by processing the magnetic material after the laminated steel plates have been laminated.

7. The fastening method according to claim 4, wherein a processing is performed on the magnetic material after the laminated steel plates are laminated to form a communication hole that extends from the side in a direction intersecting the lamination direction and communicates with the hole.

8. A method for manufacturing a mounting structure in which a side plate is attached to the magnetic material of an electromagnet, The magnetic material is constructed by stacking multiple laminated steel plates in the stacking direction, A hole is formed in the magnetic material that extends in the stacking direction. A portion of the fastening means is placed in the aforementioned hole, A method for manufacturing a mounting structure, wherein the side plate is fastened to the magnetic material using the fastening means.

9. An electromagnet having a coil and a magnetic material, An electromagnet system comprising a side plate attached to the magnetic material, The magnetic material is constructed by stacking multiple laminated steel plates in the stacking direction, and has holes extending in the stacking direction. A part of the fastening means is placed in the aforementioned hole. An electromagnet system in which the side plate is attached to the magnetic material by fastening with the fastening means.

10. A particle beam therapy device that irradiates an object with a particle beam, The system comprises an electromagnet system for deflecting the aforementioned particle beam, The electromagnet system comprises a coil, an electromagnet having a magnetic material, and a side plate attached to the magnetic material. The magnetic material is constructed by stacking multiple laminated steel plates in the stacking direction, and has holes extending in the stacking direction. A part of the fastening means is placed in the aforementioned hole. The particle beam therapy apparatus wherein the side plate is attached to the magnetic material by fastening with the fastening means.

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