JP7045937B2

JP7045937B2 - Electromagnet device

Info

Publication number: JP7045937B2
Application number: JP2018113630A
Authority: JP
Inventors: 拓小山; 康則古閑
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2018-06-14
Filing date: 2018-06-14
Publication date: 2022-04-01
Anticipated expiration: 2038-06-14
Also published as: JP2019215295A

Description

本発明は、磁場分布の乱れを調整することが可能な電磁石装置に関する。 The present invention relates to an electromagnet device capable of adjusting the turbulence of the magnetic field distribution.

電磁石装置は、磁気共鳴イメージング（ＭＲＩ：Magnetic Resonance Imaging）装置などに用いられているが、ＭＲＩ装置に用いられる電磁石装置では、静磁場を発生させる静磁場コイルとして、超伝導コイルが用いられる。この超伝導コイルを永久電流モードで通電している場合、その超伝導コイルで発生する静磁場の磁場強度を時間的に一定に保つことができる。また、研究用加速器などに用いられる研究用磁石装置では、磁場が一定値またはある目標の磁場分布となるように、高精度な磁場分布調整が要求される。例えば、磁束密度が３Ｔである磁場が１ｐｐｍ以下の精度で空間的にも時間的にも一定に保たれるようにすることが求められる。 The electromagnet device is used in a magnetic resonance imaging (MRI) device or the like, but in the electromagnet device used in the MRI device, a superconducting coil is used as the static magnetic field coil for generating a static magnetic field. When the superconducting coil is energized in the permanent current mode, the magnetic field strength of the static magnetic field generated by the superconducting coil can be kept constant over time. Further, in a research magnet device used in a research accelerator or the like, highly accurate magnetic field distribution adjustment is required so that the magnetic field has a constant value or a certain target magnetic field distribution. For example, it is required that the magnetic field having a magnetic flux density of 3T be kept constant spatially and temporally with an accuracy of 1 ppm or less.

超伝導コイルを永久電流モードで通電している場合、超伝導コイル内部の磁束は保存され、その磁場強度は一定に保たれる。この性質を利用して、電磁石装置に超伝導コイルを用い、発生磁場を１年以上の長時間ほぼ一定に維持している例もある。これらの磁石装置では、主たる磁場を生成する超伝導コイルに加えて、磁場微調整用コイル（シムコイル）または鉄片（シム鉄）、および、磁束の磁路となるヨークを備え、磁石軸方向の磁場分布を微調整することが可能なようにされている。 When the superconducting coil is energized in the permanent current mode, the magnetic flux inside the superconducting coil is conserved and its magnetic field strength is kept constant. Taking advantage of this property, there is an example in which a superconducting coil is used for the electromagnet device and the generated magnetic field is maintained almost constant for a long time of one year or more. In addition to the superconducting coil that generates the main magnetic field, these magnet devices are equipped with a magnetic field fine adjustment coil (sim coil) or iron piece (sim iron), and a yoke that serves as a magnetic path for the magnetic field, and a magnetic field in the direction of the magnet axis. It is possible to fine-tune the distribution.

ところで、研究用磁石装置では、研究の目的に応じて種々の測定機器の入れ替えが行われるため、研究用磁石装置の励磁中に磁極を開閉する作業が発生する。この磁極の開閉作業は、研究用磁石装置の運転期間中に頻繁に行われるため、磁場微調整用シムコイルやシム鉄による磁場の微調整作業に加え、磁極の位置ずれに由来する誤差磁場を調整するメカニカルシムが行われる。 By the way, in the research magnet device, various measuring instruments are replaced according to the purpose of the research, so that the work of opening and closing the magnetic poles occurs during the excitation of the research magnet device. Since this opening and closing work of the magnetic pole is frequently performed during the operation period of the research magnet device, in addition to the fine adjustment work of the magnetic field by the shim coil for fine adjustment of the magnetic field and the shim iron, the error magnetic field caused by the misalignment of the magnetic pole is adjusted. A mechanical shim is performed.

例えば、特許文献１には、磁気ヨークに固定されて互いに対向する一対の永久磁石により形成される静磁場を調整するために、各永久磁石の磁極の対向面に非鉄材料からなるディスク２０の表面に複数の穴２２を設け、穴２２内に鉄の含有量の異なるペレット１４、１６、１８を挿入し、ディスク２０をＭＲＩ装置の対向するマグネット１２の内側に設けられたマウント装置に設けられている静磁場発生装置の例が開示されている（図８及び図９参照）。
図８において、縦軸方向は、上下に設けられた一対の磁石により形成される静磁場の方向に平行な方向であり、横平面は、その静磁場の方向に垂直な平面である。図８には、下側の対向する磁石間に固定されたプラスチックディスク１００が図示されている。
図９において、プラスチックディスク１００は、丸皿状をしており、その丸皿の表面上には、複数の穴２２が設けられ、穴２２には、鉄の含有量の異なるペレット１４、１６、１８が挿入されている。このようなプラスチックディスク１００を有する静磁場発生装置によって発生される静磁場に不均一が生じた場合には、プラスチックディスク１００の表面上に形成された複数の穴２２に鉄の含有量の異なるペレット１４、１６、１８を挿入することにより、その不均一を解消することができる。従って、ペレット１４、１６、１８は、前記のいわゆるシム鉄に相当するものである。 For example, in Patent Document 1, in order to adjust a static magnetic field formed by a pair of permanent magnets fixed to a magnetic yoke and facing each other, a surface of a disk 20 made of a non-iron material is provided on the facing surface of the magnetic poles of each permanent magnet. A plurality of holes 22 are provided in the hole 22, pellets 14, 16 and 18 having different iron contents are inserted into the holes 22, and the disk 20 is provided in a mounting device provided inside the facing magnet 12 of the MRI device. An example of a static magnetic field generator is disclosed (see FIGS. 8 and 9).
In FIG. 8, the vertical axis direction is a direction parallel to the direction of the static magnetic field formed by the pair of magnets provided above and below, and the horizontal plane is a plane perpendicular to the direction of the static magnetic field. FIG. 8 shows a plastic disk 100 fixed between the lower facing magnets.
In FIG. 9, the plastic disk 100 has a round dish shape, and a plurality of holes 22 are provided on the surface of the round dish, and the holes 22 have pellets 14, 16 having different iron contents. 18 is inserted. When the static magnetic field generated by the static magnetic field generator having such a plastic disk 100 becomes non-uniform, pellets having different iron contents are formed in a plurality of holes 22 formed on the surface of the plastic disk 100. By inserting 14, 16 and 18, the non-uniformity can be eliminated. Therefore, the pellets 14, 16 and 18 correspond to the so-called shim iron described above.

米国特許第６７７８０５４号明細書U.S. Pat. No. 6778054

上述のように、特許文献１に開示された構造を有する静磁場発生装置では、鉄の含有量の異なるペレット１４、１６、１８が上下に対向して設けられた丸皿状のプラスチックディスク１００の内側面に設けられている。また、この静磁場発生装置で発生される静磁場の均一性を調整する作業（以下、磁場調整作業という）は、このペレットの鉄含有量を調整することによって行われる。しかしながら、この例の場合、ペレット１４、１６、１８がプラスチックディスク１００の内側面に設けられているため、その磁場調整作業を行うためには、作業者が上下のプラスチックディスク１００の間に形成される静磁場の中に立ち入らなければならない。 As described above, in the static magnetic field generator having the structure disclosed in Patent Document 1, a round dish-shaped plastic disk 100 in which pellets 14, 16 and 18 having different iron contents are provided vertically facing each other is provided. It is provided on the inner surface. Further, the work of adjusting the uniformity of the static magnetic field generated by this static magnetic field generator (hereinafter referred to as magnetic field adjusting work) is performed by adjusting the iron content of the pellets. However, in the case of this example, since the pellets 14, 16 and 18 are provided on the inner surface of the plastic disc 100, an operator is formed between the upper and lower plastic discs 100 in order to perform the magnetic field adjusting work. You must enter into a static magnetic field.

一般に、高磁場での特に長時間の磁場調整作業は、作業者の安全などに配慮して、磁場が励磁されている状態では行うことはできないとされている。また、研究用の電磁石装置は、発生する均一静磁場が超伝導コイルやヨーク側板などによって取り囲まれているため、実質的に励磁中の均一磁場の中に人が立ち入ることはできない。 In general, it is said that the magnetic field adjustment work in a high magnetic field for a particularly long time cannot be performed in a state where the magnetic field is excited in consideration of the safety of the operator and the like. Further, in the electromagnet device for research, since the generated uniform static magnetic field is surrounded by a superconducting coil, a yoke side plate, and the like, a person cannot enter the uniform magnetic field during excitation.

即ち、特許文献１に開示された磁極の構造を有するような静磁場発生装置では、静磁場発生装置が励磁されているときには磁場調整作業を行うのが困難であるという技術上の問題がある。 That is, in the static magnetic field generator having the structure of the magnetic pole disclosed in Patent Document 1, there is a technical problem that it is difficult to perform the magnetic field adjustment work when the static magnetic field generator is excited.

本発明は、上記した課題を解決するためになされたものであり、励磁状態であっても、作業者が高磁場の影響を受けることなく磁場調整作業を行うことが可能な電磁石装置を提供することを課題とする。 The present invention has been made to solve the above-mentioned problems, and provides an electromagnet device capable of performing magnetic field adjustment work without being affected by a high magnetic field even in an excited state. That is the issue.

本発明に係る電磁石装置は、超伝導コイルと、開口部を有し、前記超伝導コイルの上面に設けられるヨーク天板と、前記開口部に取り付けられ、前記超伝導コイルが発生する磁束を集める磁極構造体と、前記ヨーク天板と前記磁極構造体とを締結する第１部材と、前記第１部材に交換可能に取り付けられて、異なる体積を有する複数の第２部材と、を備えることを特徴とする。 The electromagnet device according to the present invention has a superconducting coil, an opening, a yoke top plate provided on the upper surface of the superconducting coil, and is attached to the opening to collect magnetic flux generated by the superconducting coil. It is provided with a magnetic flux structure, a first member for fastening the yoke top plate and the magnetic flux structure, and a plurality of second members interchangeably attached to the first member and having different volumes . It is a feature.

本発明によれば、励磁状態であっても、作業者が高磁場の影響を受けることなく磁場調整作業を行うことが可能な電磁石装置を提供することができる。 According to the present invention, it is possible to provide an electromagnet device capable of performing a magnetic field adjusting operation without being affected by a high magnetic field even in an excited state.

第１実施形態に係る電磁石装置の構成の一例を示す概略断面斜視図である。It is a schematic cross-sectional perspective view which shows an example of the structure of the electromagnet device which concerns on 1st Embodiment. 第１実施形態に係る電磁石装置のヨーク天板に取り付けられた磁極構造体の断面構造の一例を示す拡大図である。It is an enlarged view which shows an example of the cross-sectional structure of the magnetic pole structure attached to the yoke top plate of the electromagnet device which concerns on 1st Embodiment. 第１実施形態に係る電磁石装置のヨーク天板に取り付けられたボルトの構成の一例を示す斜視図である。It is a perspective view which shows an example of the structure of the bolt attached to the yoke top plate of the electromagnet device which concerns on 1st Embodiment. 第２実施形態に係る電磁石装置のボルトの構成の一例を示す斜視図である。It is a perspective view which shows an example of the structure of the bolt of the electromagnet device which concerns on 2nd Embodiment. 第３実施形態に係る電磁石装置のボルトの構成の一例を示す斜視図である。It is a perspective view which shows an example of the structure of the bolt of the electromagnet device which concerns on 3rd Embodiment. 第４実施形態に係る電磁石装置のボルトの構成の一例を示す断面斜視図である。It is sectional drawing which shows an example of the structure of the bolt of the electromagnet device which concerns on 4th Embodiment. 第５実施形態に係る電磁石装置のボルトの構成の一例を示す断面斜視図である。It is sectional drawing which shows an example of the structure of the bolt of the electromagnet device which concerns on 5th Embodiment. 第５実施形態に係る電磁石装置のボルトの構成の一例を示す斜視図である。It is a perspective view which shows an example of the structure of the bolt of the electromagnet device which concerns on 5th Embodiment. 従来の静磁場発生装置の磁極の構成の一例を示す断面図である。It is sectional drawing which shows an example of the structure of the magnetic pole of the conventional static magnetic field generator. 従来の静磁場発生装置の磁極の構成の一例を示す拡大図である。It is an enlarged view which shows an example of the structure of the magnetic pole of the conventional static magnetic field generator.

以下、実施形態に係る電磁石装置について説明する。なお、以下の説明において参照する図面は、実施形態を概略的に示したものであるため、各部材のスケールや間隔、位置関係などが誇張、あるいは、部材の一部の図示が省略されている場合がある。また、例えば平面図とその断面図において、各部材のスケールや間隔が一致しない場合もある。また、以下の説明では、同一の名称及び符号については原則として同一又は同質の部材を示しており、詳細な説明を適宜省略することとする。また、本明細書において、「上」、「下」などは構成要素間の相対的な位置を示すものであって、絶対的な位置を示すことを意図したものではない。 Hereinafter, the electromagnet device according to the embodiment will be described. Since the drawings referred to in the following description schematically show an embodiment, the scale, spacing, positional relationship, etc. of each member are exaggerated, or a part of the members is not shown. In some cases. Further, for example, in the plan view and the cross-sectional view thereof, the scales and intervals of the members may not match. Further, in the following description, the same or the same quality members are shown in principle for the same name and reference numeral, and detailed description thereof will be omitted as appropriate. Further, in the present specification, "upper", "lower" and the like indicate relative positions between components, and are not intended to indicate absolute positions.

≪第１実施形態≫
図１乃至図３を参照して、第１実施形態に係る電磁石装置７０の構成について、説明する。図１及び図２において、中心軸ＣＬは、超伝導コイル３３が発生する磁束の中心に設けられる軸を意味するものとする。 << First Embodiment >>
The configuration of the electromagnet device 70 according to the first embodiment will be described with reference to FIGS. 1 to 3. In FIGS. 1 and 2, the central axis CL means an axis provided at the center of the magnetic flux generated by the superconducting coil 33.

図１に示すように、電磁石装置７０は、ヨーク天板３１、ヨーク側板３４、超伝導コイル３３、磁極構造体３２、３２Ｋ、第１部材３６（ボルト根元部）、第２部材３７（ボルト頭部）、ヨーク底板５２、脚部５５、超伝導コイル３３を駆動するための電気回路装置（不図示）、超伝導を実現するための冷却構造（不図示）、これらを支持するための支持構造（不図示）、などを備えている。なお、本明細書において、ヨーク天板３１、磁極構造体３２、ヨーク側板３４、ヨーク底板５２を、総称してヨーク構造体と呼ぶものとする。 As shown in FIG. 1, the electromagnet device 70 includes a yoke top plate 31, a yoke side plate 34, a superconducting coil 33, a magnetic pole structure 32, 32K, a first member 36 (bolt root portion), and a second member 37 (bolt head). Part), yoke bottom plate 52, leg 55, electric circuit device for driving superconducting coil 33 (not shown), cooling structure for realizing superconductivity (not shown), support structure for supporting these. (Not shown), etc. In the present specification, the yoke top plate 31, the magnetic pole structure 32, the yoke side plate 34, and the yoke bottom plate 52 are collectively referred to as a yoke structure.

超伝導コイル３３は、ヨーク天板３１、磁極構造体３２、ヨーク側板３４、ヨーク底板５２、によって囲まれた空間に設けられる。超伝導コイル３３の個数は、特に限定されるものではなく、１つであってもよいし、複数であってもよい。
超伝導コイル３３が発生する磁束は、図１に示すような超伝導コイル３３の輪の中で、例えば、下方から上方へと向かって発生する概ね直線状の磁束となる。超伝導コイル３３が発生する磁束の大半は、磁極構造体３２に集められた後、ヨーク天板３１の各方向へと分散し、ヨーク側板３４、ヨーク底板５２を経由して、ヨーク底板５２に設けられる磁極構造体３２Ｋで集束する。その後、磁束は、磁極構造体３２Ｋから吐出されて、再び、超伝導コイル３３の輪の中へと戻る。 The superconducting coil 33 is provided in a space surrounded by a yoke top plate 31, a magnetic pole structure 32, a yoke side plate 34, and a yoke bottom plate 52. The number of superconducting coils 33 is not particularly limited, and may be one or a plurality.
The magnetic flux generated by the superconducting coil 33 is, for example, a substantially linear magnetic flux generated from the lower side to the upper side in the ring of the superconducting coil 33 as shown in FIG. Most of the magnetic flux generated by the superconducting coil 33 is collected in the magnetic pole structure 32 and then dispersed in each direction of the yoke top plate 31, via the yoke side plate 34 and the yoke bottom plate 52, and then distributed to the yoke bottom plate 52. Focus on the magnetic flux structure 32K provided. After that, the magnetic flux is discharged from the magnetic pole structure 32K and returns to the inside of the ring of the superconducting coil 33 again.

ヨーク構造体は、超伝導コイル３３が発生する磁束の磁路となる。従って、ヨーク構造体は、鉄などの磁性材料によって形成されることが好ましい。 The yoke structure is a magnetic path of the magnetic flux generated by the superconducting coil 33. Therefore, the yoke structure is preferably formed of a magnetic material such as iron.

ヨーク天板３１は、超伝導コイル３３の上面に設けられ、ヨーク側板３４の上面を塞ぐように取り付けられる。ヨーク天板３１は、内側、即ち、磁極構造体３２に近い側に形成されるヨーク天板３１ａと、外側、即ち、磁極構造体３２から遠い側に形成されるヨーク天板３１ｂと、を備えている。
ヨーク底板５２は、超伝導コイル３３の下面に設けられ、ヨーク側板３４の下面を塞ぐように取り付けられる。また、ヨーク底板５２の下面には、脚部５５が取り付けられ、電磁石装置７０は、脚部５５によって支持され固定される。 The yoke top plate 31 is provided on the upper surface of the superconducting coil 33, and is attached so as to close the upper surface of the yoke side plate 34. The yoke top plate 31 includes a yoke top plate 31a formed on the inside, that is, on the side close to the magnetic pole structure 32, and a yoke top plate 31b formed on the outside, that is, on the side far from the magnetic pole structure 32. ing.
The yoke bottom plate 52 is provided on the lower surface of the superconducting coil 33, and is attached so as to close the lower surface of the yoke side plate 34. Further, a leg portion 55 is attached to the lower surface of the yoke bottom plate 52, and the electromagnet device 70 is supported and fixed by the leg portion 55.

ヨーク天板３１及びヨーク底板５２の中心部には、中心軸ＣＬを中心とする開口部２６が配置される。開口部２６の上部には、磁極構造体３２が着脱可能に取り付けられている。また、開口部２６の下部には、磁極構造体３２Ｋが取り付けられている。
ヨーク天板３１及びヨーク底板５２の形状は、円形状に限定されるものではなく、６角形状などの多角形状であってもよい。なお、ヨーク天板３１とヨーク底板５２との相違は、脚部５５を別にして、ヨーク側板３４の上面に取り付けられているか、ヨーク側板３４の下面に取り付けられているかの相違にすぎない。従って、本明細書におけるヨーク天板３１の説明は、特に断らない限り、ヨーク底板５２にもそのまま適用されるものとする。 An opening 26 centered on the central axis CL is arranged at the center of the yoke top plate 31 and the yoke bottom plate 52. A magnetic pole structure 32 is detachably attached to the upper portion of the opening 26. Further, a magnetic pole structure 32K is attached to the lower portion of the opening 26.
The shapes of the yoke top plate 31 and the yoke bottom plate 52 are not limited to a circular shape, and may be a polygonal shape such as a hexagonal shape. The difference between the yoke top plate 31 and the yoke bottom plate 52 is merely the difference between being attached to the upper surface of the yoke side plate 34 and being attached to the lower surface of the yoke side plate 34, apart from the legs 55. Therefore, the description of the yoke top plate 31 in the present specification shall be applied to the yoke bottom plate 52 as it is, unless otherwise specified.

ヨーク側板３４は、中心軸ＣＬを対称軸とする筒形状であり、上面には、ヨーク天板３１が取り付けられ、下面には、ヨーク底板５２が取り付けられている。ヨーク側板３４は、超伝導コイル３３の円周方向に沿って、超伝導コイル３３の側面を囲むように設けられる。ヨーク側板３４の形状は、円筒形状に限定されるものではなく、６角筒形状などの多角筒形状であってもよい。 The yoke side plate 34 has a tubular shape with the central axis CL as the axis of symmetry, and the yoke top plate 31 is attached to the upper surface and the yoke bottom plate 52 is attached to the lower surface. The yoke side plate 34 is provided so as to surround the side surface of the superconducting coil 33 along the circumferential direction of the superconducting coil 33. The shape of the yoke side plate 34 is not limited to a cylindrical shape, and may be a polygonal cylinder shape such as a hexagonal cylinder shape.

磁極構造体３２は、中心軸ＣＬを対称軸とする対称構造を有している。また、磁極構造体３２は、外周面において、磁石外側寄りの外径が大きく、且つ磁石内側寄りの外径が小さくなるような段付き構造を有している。また、磁極構造体３２は、内周面２７（図２参照）において、段付き構造を有していない。 The magnetic pole structure 32 has a symmetric structure with the central axis CL as the axis of symmetry. Further, the magnetic pole structure 32 has a stepped structure on the outer peripheral surface such that the outer diameter toward the outside of the magnet is large and the outer diameter toward the inside of the magnet is small. Further, the magnetic pole structure 32 does not have a stepped structure on the inner peripheral surface 27 (see FIG. 2).

磁極構造体３２は、開口部２６に着脱可能に取り付けられ、超伝導コイル３３が発生する磁束を集めてヨーク天板３１へと導いている。
磁極構造体３２は、図２に示すように、ヨーク接続部３２ａ、外周傾斜部３２ｂ、磁束集束円筒部３２ｃ、という３つの部分により構成されている。
ヨーク接続部３２ａは、外周側面に係合部５１及び係合部５３が形成される。ヨーク接続部３２ａは、貫通孔に第１部材３６が挿入されることで、ヨーク天板３１と締結する。
外周傾斜部３２ｂは、外周側面の径が、磁石外側から磁石内側へと向かって、次第に小さくなるように形成され、ヨーク接続部３２ａと磁束集束円筒部３２ｃとの間に設けられる。
磁束集束円筒部３２ｃは、外周側面の径が一定であり、円筒形状を有する。磁束集束円筒部３２ｃは、超伝導コイル３３が発生する磁束を集める役割を担っている。 The magnetic pole structure 32 is detachably attached to the opening 26, collects the magnetic flux generated by the superconducting coil 33, and guides the magnetic flux to the yoke top plate 31.
As shown in FIG. 2, the magnetic pole structure 32 is composed of three parts: a yoke connecting portion 32a, an outer peripheral inclined portion 32b, and a magnetic flux focusing cylindrical portion 32c.
The yoke connecting portion 32a has an engaging portion 51 and an engaging portion 53 formed on the outer peripheral side surface thereof. The yoke connecting portion 32a is fastened to the yoke top plate 31 by inserting the first member 36 into the through hole.
The outer peripheral inclined portion 32b is formed so that the diameter of the outer peripheral side surface gradually decreases from the outer side of the magnet to the inner side of the magnet, and is provided between the yoke connecting portion 32a and the magnetic flux focusing cylindrical portion 32c.
The magnetic flux focusing cylindrical portion 32c has a constant diameter on the outer peripheral side surface and has a cylindrical shape. The magnetic flux focusing cylindrical portion 32c plays a role of collecting the magnetic flux generated by the superconducting coil 33.

係合部５１は、磁極構造体３２の外周面に接するヨーク天板３１ａの内周面上側に、少なくとも１箇所以上形成される。或いは、係合部５１は、ヨーク天板３１ａの外周面上側に接するヨーク天板３１ｂの内周面に、少なくとも１箇所以上形成される。
係合部５１は、磁石外側寄りに位置する部分の内周面の径を、磁石内側寄りに位置する部分の外周面の径より大きくした内周面の段付き構造によって実現される。 At least one engaging portion 51 is formed on the upper side of the inner peripheral surface of the yoke top plate 31a in contact with the outer peripheral surface of the magnetic pole structure 32. Alternatively, at least one engaging portion 51 is formed on the inner peripheral surface of the yoke top plate 31b in contact with the upper side of the outer peripheral surface of the yoke top plate 31a.
The engaging portion 51 is realized by a stepped structure of the inner peripheral surface in which the diameter of the inner peripheral surface of the portion located closer to the outer side of the magnet is larger than the diameter of the outer peripheral surface of the portion located closer to the inner side of the magnet.

係合部５３は、ヨーク天板３１ａの内周面に接する磁極構造体３２の外周面下側に、少なくとも１箇所以上形成される。或いは、係合部５３は、ヨーク天板３１ｂの内周面下側に接するヨーク天板３１ａの外周面に、少なくとも１箇所以上形成される。
係合部５３は、磁石外側寄りに位置する部分の外周面の径を、磁石内側寄りに位置する部分の外周面の径より大きくした外周面の段付き構造によって実現される。 At least one engaging portion 53 is formed on the lower side of the outer peripheral surface of the magnetic pole structure 32 in contact with the inner peripheral surface of the yoke top plate 31a. Alternatively, at least one engaging portion 53 is formed on the outer peripheral surface of the yoke top plate 31a in contact with the lower side of the inner peripheral surface of the yoke top plate 31b.
The engaging portion 53 is realized by a stepped structure of the outer peripheral surface in which the diameter of the outer peripheral surface of the portion located closer to the outer side of the magnet is larger than the diameter of the outer peripheral surface of the portion located closer to the inner side of the magnet.

ボルト３５（３５ａ、３５ｂ）は、第１部材３６（ボルト根元部）と、第２部材３７（ボルト頭部）と、を備えている。ボルト３５ａは、磁極構造体３２に設置されて、磁極構造体３２とヨーク天板３１ａとを締結する。ボルト３５ｂは、ヨーク天板３１ａに設置されて、ヨーク天板３１ａとヨーク天板３１ｂとを締結する。なお、ボルト３５は、磁極構造体３２及びヨーク天板３１ａのみならず、磁極構造体３２Ｋ及びヨーク底板５２にも設けられることが好ましい。 The bolt 35 (35a, 35b) includes a first member 36 (bolt root portion) and a second member 37 (bolt head portion). The bolt 35a is installed in the magnetic pole structure 32 and fastens the magnetic pole structure 32 and the yoke top plate 31a. The bolt 35b is installed on the yoke top plate 31a and fastens the yoke top plate 31a and the yoke top plate 31b. The bolt 35 is preferably provided not only on the magnetic pole structure 32 and the yoke top plate 31a, but also on the magnetic pole structure 32K and the yoke bottom plate 52.

ボルト３５ａは、開口部２６を取り囲むように、超伝導コイル３３の円周方向に沿って、複数設けられる。ボルト３５ａは、磁極構造体３２の外面２８から挿入されて、ヨーク天板３１ａの内部までねじ込まれる。
磁極構造体３２には、外面２８からヨーク天板３１ａの内部まで貫通する複数の貫通孔が予め設けられ、該貫通孔には、ボルト３５ａをねじ込むための雌ネジのネジ山が形成されている。 A plurality of bolts 35a are provided along the circumferential direction of the superconducting coil 33 so as to surround the opening 26. The bolt 35a is inserted from the outer surface 28 of the magnetic pole structure 32 and screwed into the inside of the yoke top plate 31a.
The magnetic pole structure 32 is provided with a plurality of through holes penetrating from the outer surface 28 to the inside of the yoke top plate 31a in advance, and the through holes are formed with female threads for screwing the bolts 35a. ..

ボルト３５ｂは、開口部２６を取り囲むように、超伝導コイル３３の円周方向に沿って、複数設けられる。ボルト３５ｂは、ヨーク天板３１ａの外面２８から挿入されて、ヨーク天板３１ｂの内部までねじ込まれる。
ヨーク天板３１ａには、外面２８からヨーク天板３１ｂの内部まで貫通する複数の貫通孔が予め設けられ、該貫通孔には、ボルト３５ｂをねじ込むための雌ネジのネジ山が形成されている。 A plurality of bolts 35b are provided along the circumferential direction of the superconducting coil 33 so as to surround the opening 26. The bolt 35b is inserted from the outer surface 28 of the yoke top plate 31a and screwed into the inside of the yoke top plate 31b.
The yoke top plate 31a is provided with a plurality of through holes penetrating from the outer surface 28 to the inside of the yoke top plate 31b in advance, and the through holes are formed with female screw threads for screwing the bolts 35b. ..

第１部材３６は、例えば、ステンレス等の非磁性材料によって構成されることが好ましく、磁極構造体３２とヨーク天板３１ａとを締結する、或いは、ヨーク天板３１ａとヨーク天板３１ｂとを締結する。
即ち、第１部材３６は、係合部５１及び係合部５３の段差部分を介して、磁極構造体３２とヨーク天板３１ａとの両者を固定する。或いは、第１部材３６は、係合部５１及び係合部５３の段差部分を介して、ヨーク天板３１ａとヨーク天板３１ｂとの両者を固定する。 The first member 36 is preferably made of, for example, a non-magnetic material such as stainless steel, and fastens the magnetic pole structure 32 and the yoke top plate 31a, or fastens the yoke top plate 31a and the yoke top plate 31b. do.
That is, the first member 36 fixes both the magnetic pole structure 32 and the yoke top plate 31a via the stepped portion of the engaging portion 51 and the engaging portion 53. Alternatively, the first member 36 fixes both the yoke top plate 31a and the yoke top plate 31b via the stepped portions of the engaging portion 51 and the engaging portion 53.

磁場調整の作業者（磁場の乱れを調整する作業者）は、第１部材３６を、例えば、レンチ（ネジ回し）などで回転させることで、磁極構造体３２に設けられた貫通孔に、第１部材３６をねじ込む。或いは、磁場調整の作業者は、第１部材３６を、例えば、レンチ（ネジ回し）などで回転させることで、ヨーク天板３１ａに設けられた貫通孔に、第１部材３６をねじ込む。 The magnetic field adjusting worker (worker who adjusts the turbulence of the magnetic field) rotates the first member 36 with, for example, a wrench (screw turn) to insert the first member 36 into the through hole provided in the magnetic pole structure 32. 1 Screw the member 36. Alternatively, the magnetic field adjusting operator rotates the first member 36 with, for example, a wrench (screw turn) to screw the first member 36 into the through hole provided in the yoke top plate 31a.

図３に示すように、第１部材３６は、外面２８から突出する六角形状の突出部分３６＿１と、レンチ等でねじ回し可能なねじ回し部分３６＿２と、突出部分３６＿１の表面に形成される凸部３６＿３と、を備えている。第１部材３６に凸部３６＿３が形成されることで、第２部材３７を設ける際、第１部材３６に対する第２部材３７の位置が決定され易くなる。即ち、磁場調整の作業者は、第１部材３６の上に第２部材３７を配置し易くなる。 As shown in FIG. 3, the first member 36 has a hexagonal protruding portion 36_1 protruding from the outer surface 28, a screwdriver portion 36_1 that can be screwed with a wrench or the like, and a convex portion formed on the surface of the protruding portion 36_1. 36_3 and. By forming the convex portion 36_3 on the first member 36, the position of the second member 37 with respect to the first member 36 can be easily determined when the second member 37 is provided. That is, the operator of the magnetic field adjustment can easily arrange the second member 37 on the first member 36.

第２部材３７は、例えば、鉄等の磁性材料によって構成されることが好ましく、第１部材３６に対して着脱可能に取り付けられる。即ち、磁場調整の作業者は、第１部材３６の表面に、第２部材３７を設置する。
第２部材３７は、凸部３６＿３と対向する位置に、凹部３７＿３を備えている。これにより、磁場調整の作業者は、第１部材３６の凸部３６＿３と第２部材３７の凹部３７＿３とが嵌り合うように、第１部材３６の表面に、第２部材３７を設置することが可能になる。なお、凸部３６＿３及び凹部３７＿３の形状は、両者が嵌り合う形状であれば、特に限定されるものではない。 The second member 37 is preferably made of, for example, a magnetic material such as iron, and is detachably attached to the first member 36. That is, the magnetic field adjusting worker installs the second member 37 on the surface of the first member 36.
The second member 37 is provided with a concave portion 37_3 at a position facing the convex portion 36_3. As a result, the magnetic field adjusting worker can install the second member 37 on the surface of the first member 36 so that the convex portion 36_3 of the first member 36 and the concave portion 37_3 of the second member 37 fit into each other. It will be possible. The shapes of the convex portion 36_3 and the concave portion 37_3 are not particularly limited as long as they fit each other.

図３に示すように、第２部材３７は、体積が可変可能である。第２部材３７の体積が変化することで、電磁石装置７０（図１参照）において、励磁状態であっても、作業者が高磁場の影響を受けることなく磁場調整作業を行うことが可能になる。
例えば、磁場調整の作業者は、第１部材３６の表面に、第２部材３７Ｂより体積が大きい第２部材３７Ｃを取り付けることが可能である（図３（Ｃ）参照）。これにより、第２部材３７は、第２部材３７Ｂから第２部材３７Ｃへと体積を大きくすることが可能である。
例えば、磁場調整の作業者は、第１部材３６の表面に、第２部材３７Ｂより体積が小さい第２部材３７Ａを取り付けることが可能である（図３（Ａ）参照）。これにより、第２部材３７は、第２部材３７Ｂから第２部材３７Ａへと体積を小さくすることが可能である。
なお、磁場調整の作業者は、この磁場調整作業において、複数のボルト３５の全てに、第２部材３７を設置する必要はなく、磁場調整作業の状況に応じて、必要な箇所のボルト３５のみに対して、第２部材３７を設置すればよい。 As shown in FIG. 3, the volume of the second member 37 is variable. By changing the volume of the second member 37, in the electromagnet device 70 (see FIG. 1), the operator can perform the magnetic field adjustment work without being affected by the high magnetic field even in the excited state. ..
For example, a magnetic field adjusting worker can attach the second member 37C, which has a larger volume than the second member 37B, to the surface of the first member 36 (see FIG. 3C). As a result, the volume of the second member 37 can be increased from the second member 37B to the second member 37C.
For example, a magnetic field adjusting worker can attach the second member 37A, which has a smaller volume than the second member 37B, to the surface of the first member 36 (see FIG. 3A). As a result, the volume of the second member 37 can be reduced from the second member 37B to the second member 37A.
It should be noted that the magnetic field adjusting worker does not need to install the second member 37 on all of the plurality of bolts 35 in this magnetic field adjusting work, and only the bolts 35 at the necessary places depending on the situation of the magnetic field adjusting work. However, the second member 37 may be installed.

ここで、磁場調整の具体的な作業方法について、簡単に説明する。電磁石装置７０の超伝導コイル３３を励磁後、磁極構造体３２の開口部２６より超伝導コイル３３の中心に向かって磁気センサーを挿入する。挿入した磁気センサーで磁場強度分布計測を実施し、磁場均一度を評価する。
磁場均一度が、仕様値を満たしていれば、磁場調整作業は終了となる。磁場均一度が仕様値を満たしていない場合は、第２部材３７を第１部材３６に配置する。第２部材３７の配置作業後、磁気センサーによる磁場強度分布計測を実施し、磁場均一度を評価する。磁場均一度が仕様値を満たしていれば、磁場調整作業は終了となる。磁場均一度が仕様値を満たしていない場合は、第２部材３７Ｂを、より大きい第２部材３７Ｃ、あるいはより小さい第２部材３７Ａに変更し配置する。第２部材３７の配置作業後、磁気センサーによる磁場強度分布計測を実施し、磁場均一度を評価する。以降この作業を磁場均一度が仕様値以下になるまで繰り返す。 Here, a specific work method for adjusting the magnetic field will be briefly described. After exciting the superconducting coil 33 of the electromagnet device 70, a magnetic sensor is inserted from the opening 26 of the magnetic pole structure 32 toward the center of the superconducting coil 33. The magnetic field intensity distribution is measured with the inserted magnetic sensor, and the magnetic field uniformity is evaluated.
If the magnetic field uniformity satisfies the specification value, the magnetic field adjustment work is completed. If the magnetic field uniformity does not meet the specified value, the second member 37 is arranged in the first member 36. After the placement work of the second member 37, the magnetic field intensity distribution is measured by the magnetic sensor, and the magnetic field uniformity is evaluated. If the magnetic field uniformity meets the specification value, the magnetic field adjustment work is completed. If the magnetic field uniformity does not meet the specification value, the second member 37B is changed to a larger second member 37C or a smaller second member 37A and arranged. After the placement work of the second member 37, the magnetic field intensity distribution is measured by the magnetic sensor, and the magnetic field uniformity is evaluated. After that, this work is repeated until the magnetic field uniformity becomes less than the specified value.

上記、第２部材３７の配置作業により、磁極構造体３２の超伝導コイル３３の中心軸ＣＬからの偏芯による磁場均一度の低下を調整することができ、具体的には、磁極構造体３２の偏芯を０．２ｍｍまで許容できる。 By the above-mentioned arrangement work of the second member 37, it is possible to adjust the decrease in magnetic field uniformity due to the eccentricity from the central axis CL of the superconducting coil 33 of the magnetic pole structure 32, specifically, the magnetic pole structure 32. Eccentricity can be tolerated up to 0.2 mm.

ところで、超伝導コイル３３に永久電流モードの通電がされている場合、超伝導コイル３３には、一定の電流が流れ続けることから、超伝導コイル３３の輪をくぐり抜ける磁束は保存される。そのため、超伝導コイル３３の輪の中における静磁場の磁場強度は、時間的に一定に保たれる。また、超伝導コイル３３の輪をくぐり抜けた磁束は、ヨーク構造体を通過し、磁路を形成する。その際、磁極構造体３２及びヨークの磁気抵抗Ｒ_ｍは、次の式（１）で表される。 By the way, when the superconducting coil 33 is energized in the permanent current mode, a constant current continues to flow in the superconducting coil 33, so that the magnetic flux passing through the ring of the superconducting coil 33 is preserved. Therefore, the magnetic field strength of the static magnetic field in the ring of the superconducting coil 33 is kept constant over time. Further, the magnetic flux passing through the ring of the superconducting coil 33 passes through the yoke structure and forms a magnetic path. At that time, the magnetic resistance _Rm of the magnetic pole structure 32 and the yoke is expressed by the following equation (1).

一般に、直流の電磁石装置では、巻回されたコイルの中央部位置におけるコイル径方向の静磁場強度分布を一定に保つためには、コイル周囲に設けられるヨークの磁気抵抗をコイル周回方向で一定にする必要がある。 Generally, in a DC electromagnet device, in order to keep the static magnetic field strength distribution in the coil radial direction at the center position of the wound coil constant, the magnetic resistance of the yoke provided around the coil is made constant in the coil circumferential direction. There is a need to.

本実施形態では、複数のボルト３５が、磁極構造体３２からヨーク天板３１ａへとねじ込むように設けられ、或いは、ヨーク天板３１ａからヨーク天板３１ｂへとねじ込むように設けられ、第１部材３６が、外面２８から突出する。そして、複数のボルト３５は、超伝導コイル３３の円周方向に沿って所定の間隔で円形状に並んでいる。 In the present embodiment, a plurality of bolts 35 are provided so as to be screwed from the magnetic pole structure 32 to the yoke top plate 31a, or are provided so as to be screwed from the yoke top plate 31a to the yoke top plate 31b. 36 projects from the outer surface 28. The plurality of bolts 35 are arranged in a circular shape at predetermined intervals along the circumferential direction of the superconducting coil 33.

従って、本実施形態に係る電磁石装置７０によれば、ボルト３５の第１部材３６が外面２８から突出し、第１部材３６の表面に形成される凸部３６＿３に嵌り合うように設置される第２部材３７の体積を調整することにより、各周回位置（角度）における磁気抵抗、即ち、磁場強度の分布を調整することが可能になる。 Therefore, according to the electromagnet device 70 according to the present embodiment, the first member 36 of the bolt 35 is installed so as to protrude from the outer surface 28 and fit into the convex portion 36_3 formed on the surface of the first member 36. By adjusting the volume of the member 37, it becomes possible to adjust the magnetic resistance at each orbital position (angle), that is, the distribution of the magnetic field strength.

例えば、磁場強度分布が一定になるように磁場調整を実施しても、一旦、磁極構造体３２がヨーク天板３１から外され、その後、再度取り付けられた場合には、その取り付け時の機械的な誤差のために、磁場強度分布に乱れが発生することは避けられない。 For example, even if the magnetic field is adjusted so that the magnetic field strength distribution is constant, if the magnetic pole structure 32 is once removed from the yoke top plate 31 and then reattached, it is mechanically attached at the time of attachment. It is inevitable that the magnetic field strength distribution will be disturbed due to various errors.

しかしながら、本実施形態に係る電磁石装置７０によれば、ボルト３５の第２部材３７を、第２部材３７Ａ，３７Ｂ，３７Ｃに交換して体積を調整することにより、その磁場の乱れを解消することができる。また、磁場調整の作業者は、電磁石装置７０の外側から第２部材３７の体積を調整することができる。従って、磁場調整の作業者は、超伝導コイル３３が励磁状態であっても、超伝導コイル３３が発生する高磁場の中に立ち入ることなく、即ち、高磁場の影響を受けることなく磁場調整作業を行うことが可能になる。 However, according to the electromagnet device 70 according to the present embodiment, the disturbance of the magnetic field is eliminated by replacing the second member 37 of the bolt 35 with the second members 37A, 37B, 37C and adjusting the volume. Can be done. Further, the operator of the magnetic field adjustment can adjust the volume of the second member 37 from the outside of the electromagnet device 70. Therefore, even if the superconducting coil 33 is in an excited state, the magnetic field adjusting worker does not enter the high magnetic field generated by the superconducting coil 33, that is, without being affected by the high magnetic field. Will be able to do.

≪第２実施形態≫
図４を参照して、第２実施形態に係るボルト３５の構成について、説明する。なお、超伝導コイル３３、ヨーク構造体などに対するボルト３５の相対的な配置は、第１実施形態を参照できる。 << Second Embodiment >>
The configuration of the bolt 35 according to the second embodiment will be described with reference to FIG. 4. The relative arrangement of the bolt 35 with respect to the superconducting coil 33, the yoke structure, and the like can be referred to the first embodiment.

図４に示すように、ボルト３５は、第１部材３６Ｘと、第２部材３７Ｘと、を備えている。 As shown in FIG. 4, the bolt 35 includes a first member 36X and a second member 37X.

第１部材３６Ｘは、外面２８から突出する六角形状の突出部分３６Ｘ＿１と、レンチ等でねじ回し可能なねじ回し部分３６Ｘ＿２と、突出部分３６Ｘ＿１の表面に形成される第２部材取り付け用雄ネジ３６Ｘ＿３と、を備えている。第１部材３６Ｘに第２部材取り付け用雄ネジ３６Ｘ＿３が形成されることで、第２部材３７Ｘを設ける際、第１部材３６Ｘに対する第２部材３７Ｘの位置が決定され易くなる。即ち、磁場調整の作業者は、第１部材３６Ｘの上に第２部材３７Ｘを配置し易くなる。 The first member 36X includes a hexagonal protruding portion 36X_1 protruding from the outer surface 28, a screwdriver portion 36X_2 that can be screwed with a wrench or the like, and a second member mounting male screw 36X_1 formed on the surface of the protruding portion 36X_1. , Is equipped. By forming the second member mounting male screw 36X_3 on the first member 36X, the position of the second member 37X with respect to the first member 36X can be easily determined when the second member 37X is provided. That is, the operator of the magnetic field adjustment can easily arrange the second member 37X on the first member 36X.

第２部材３７Ｘは、第２部材取り付け用雄ネジ３６Ｘ＿３と対向する位置に、雌ネジ３７Ｘ＿３を備えている。これにより、磁場調整の作業者は、第１部材３６Ｘの第２部材取り付け用雄ネジ３６Ｘ＿３と第２部材３７の雌ネジ３７Ｘ＿３とが嵌り合うように、第１部材３６Ｘの表面に、第２部材３７Ｘを設置することが可能になる。なお、第２部材取り付け用雄ネジ３６Ｘ＿３及び雌ネジ３７Ｘ＿３の形状は、特に限定されるものではない。 The second member 37X is provided with a female screw 37X_3 at a position facing the male screw 36X_3 for attaching the second member. As a result, the worker of the magnetic field adjustment can perform the second member on the surface of the first member 36X so that the male screw 36X_3 for attaching the second member of the first member 36X and the female screw 37X_3 of the second member 37 fit into each other. It becomes possible to install 37X. The shapes of the male screw 36X_3 and the female screw 37X_3 for attaching the second member are not particularly limited.

第２実施形態に係るボルト３５の構成によれば、第１部材３６Ｘと第２部材３７Ｘとが強固に固定されるため、例えば、ヨーク底板５２に、ボルト３５を設置した場合であっても、磁場調整の作業者は、第２部材３７Ｘの落下などを気にする事無く安定した作業を行うことが可能となる。 According to the configuration of the bolt 35 according to the second embodiment, the first member 36X and the second member 37X are firmly fixed. Therefore, for example, even when the bolt 35 is installed on the yoke bottom plate 52, the bolt 35 is firmly fixed. The magnetic field adjusting worker can perform stable work without worrying about the drop of the second member 37X.

第２実施形態に係る電磁石装置７０によれば、第１実施形態と同様に、第２部材３７Ｘの体積量などを調整することで、磁場の乱れを調整することができる。また、第２実施形態に係る電磁石装置７０によれば、励磁状態であっても、作業者が高磁場の影響を受けることなく磁場調整作業を行うことができる。 According to the electromagnet device 70 according to the second embodiment, the turbulence of the magnetic field can be adjusted by adjusting the volume amount of the second member 37X and the like as in the first embodiment. Further, according to the electromagnet device 70 according to the second embodiment, the operator can perform the magnetic field adjusting work without being affected by the high magnetic field even in the excited state.

≪第３実施形態≫
図５を参照して、第３実施形態に係るボルト３５の構成について、説明する。なお、超伝導コイル３３、ヨーク構造体などに対するボルト３５の相対的な配置は、第１実施形態を参照できる。 << Third Embodiment >>
The configuration of the bolt 35 according to the third embodiment will be described with reference to FIG. The relative arrangement of the bolt 35 with respect to the superconducting coil 33, the yoke structure, and the like can be referred to the first embodiment.

図５に示すように、ボルト３５は、第１部材３６Ｙと、第２部材３７Ｙと、を備えている。 As shown in FIG. 5, the bolt 35 includes a first member 36Y and a second member 37Y.

第１部材３６Ｙは、外面２８から突出する六角形状の突出部分３６Ｙ＿１と、レンチ等でねじ回し可能なねじ回し部分３６Ｙ＿２と、突出部分３６Ｙ＿１の表面に形成される逆円錐台形状の凸部３６Ｙ＿３と、を備えている。第１部材３６Ｙに逆円錐台形状の凸部３６Ｙ＿３が形成されることで、第２部材３７Ｙを設ける際、第１部材３６Ｙに対する第２部材３７Ｙの位置が決定され易くなる。即ち、磁場調整の作業者は、第１部材３６Ｙの上に第２部材３７Ｙを配置し易くなる。 The first member 36Y includes a hexagonal protruding portion 36Y_1 protruding from the outer surface 28, a screwdriver portion 36Y_2 that can be screwed with a wrench or the like, and an inverted truncated cone-shaped convex portion 36Y_3 formed on the surface of the protruding portion 36Y_1. , Is equipped. By forming the inverted cone-shaped convex portion 36Y_3 on the first member 36Y, the position of the second member 37Y with respect to the first member 36Y can be easily determined when the second member 37Y is provided. That is, the operator of the magnetic field adjustment can easily arrange the second member 37Y on the first member 36Y.

第２部材３７Ｙは、逆円錐台形状の凸部３６Ｙ＿３と対向する位置に、逆円錐台形状の凹部３７Ｙ＿３を備えている。これにより、磁場調整の作業者は、第１部材３６Ｙの逆円錐台形状の凸部３６Ｙ＿３と第２部材３７Ｙの逆円錐台形状の凹部３７Ｙ＿３とが嵌り合うように、第１部材３６Ｙの表面に、第２部材３７Ｙを設置することが可能になる。 The second member 37Y is provided with a concave portion 37Y_3 having an inverted truncated cone shape at a position facing the convex portion 36Y_3 having an inverted truncated cone shape. As a result, the magnetic field adjusting worker can perform the magnetic field adjustment on the surface of the first member 36Y so that the inverted cone-shaped convex portion 36Y_3 of the first member 36Y and the inverted cone-shaped concave portion 37Y_3 of the second member 37Y fit into each other. , The second member 37Y can be installed.

また、第２部材３７Ｙは、第２部材半体３７Ｙ＿１と第２部材半体３７Ｙ＿２とに分割可能である。分割された第２部材半体３７Ｙ＿１と第２部材半体３７Ｙ＿２とは、ボルト６０によって締結される。ボルト６０は、例えば、ステンレス等の非磁性材料により形成されることが好ましい。 Further, the second member 37Y can be divided into a second member half body 37Y_1 and a second member half body 37Y_1. The divided second member half body 37Y_1 and the second member half body 37Y_1 are fastened by bolts 60. The bolt 60 is preferably formed of a non-magnetic material such as stainless steel.

第３実施形態に係るボルト３５の構成によれば、第１部材３６Ｙと第２部材３７Ｙとがボルト６０によって強固に固定されるため、例えば、ヨーク底板５２（図１参照）に、ボルト３５を設置した場合であっても、磁場調整の作業者は、第２部材３７Ｙの落下などを気にする事無く安定した作業を行うことが可能となる。 According to the configuration of the bolt 35 according to the third embodiment, the first member 36Y and the second member 37Y are firmly fixed by the bolt 60. Therefore, for example, the bolt 35 is attached to the yoke bottom plate 52 (see FIG. 1). Even when it is installed, the magnetic field adjusting worker can perform stable work without worrying about dropping of the second member 37Y.

第３実施形態に係る電磁石装置７０によれば、第１実施形態と同様に、第２部材３７Ｙの体積量などを調整することで、磁場の乱れを調整することができる。また、第３実施形態に係る電磁石装置７０によれば、励磁状態であっても、作業者が高磁場の影響を受けることなく磁場調整作業を行うことができる。 According to the electromagnet device 70 according to the third embodiment, the turbulence of the magnetic field can be adjusted by adjusting the volume amount of the second member 37Y and the like as in the first embodiment. Further, according to the electromagnet device 70 according to the third embodiment, the operator can perform the magnetic field adjusting work without being affected by the high magnetic field even in the excited state.

≪第４実施形態≫
図６を参照して、第４実施形態に係るボルト３５の構成について、説明する。なお、超伝導コイル３３、ヨーク構造体などに対するボルト３５の相対的な配置は、第１実施形態を参照できる。 << Fourth Embodiment >>
The configuration of the bolt 35 according to the fourth embodiment will be described with reference to FIG. The relative arrangement of the bolt 35 with respect to the superconducting coil 33, the yoke structure, and the like can be referred to the first embodiment.

図６に示すように、ボルト３５は、第１部材３６Ｚと、複数の第１部材３６Ｚと対向して設けられる第２部材３７Ｚと、を備えている。 As shown in FIG. 6, the bolt 35 includes a first member 36Z and a second member 37Z provided so as to face the plurality of first members 36Z.

第１部材３６Ｚは、外面２８から突出する六角形状の突出部分３６Ｚ＿１と、レンチ等でねじ回し可能なねじ回し部分３６Ｚ＿２と、突出部分３６Ｚ＿１の表面に形成される凸部３６Ｚ＿３と、を備えている。第１部材３６Ｚに凸部３６Ｚ＿３が形成されることで、複数の第１部材３６Ｚと対向して第２部材３７Ｚを設ける際、複数の第１部材３６Ｚに対する第２部材３７Ｚの位置が決定され易くなる。即ち、磁場調整の作業者は、複数の第１部材３６Ｚの上に第２部材３７Ｚを配置し易くなる。 The first member 36Z includes a hexagonal protruding portion 36Z_1 protruding from the outer surface 28, a screwdriver portion 36Z_1 that can be screwed with a wrench or the like, and a convex portion 36Z_3 formed on the surface of the protruding portion 36Z_1. .. By forming the convex portion 36Z_3 on the first member 36Z, when the second member 37Z is provided facing the plurality of first members 36Z, the position of the second member 37Z with respect to the plurality of first members 36Z can be easily determined. Become. That is, the operator of the magnetic field adjustment can easily arrange the second member 37Z on the plurality of first members 36Z.

第２部材３７Ｚは、複数の第１部材３６Ｚと対向する位置に、複数の凹部３７Ｚ＿３を備えている。これにより、磁場調整の作業者は、第１部材３６Ｚの複数の凸部３６Ｚ＿３と第２部材３７の複数の凹部３７Ｚ＿３とが嵌り合うように、複数の第１部材３６Ｚの表面に、第２部材３７Ｚを設置することが可能になる。なお、凸部３６Ｚ＿３及び凹部３７Ｚ＿３の形状は、両者が嵌り合う形状であれば、特に限定されるものではない。 The second member 37Z is provided with a plurality of recesses 37Z_3 at positions facing the plurality of first members 36Z. As a result, the operator of the magnetic field adjustment can perform the second member on the surface of the plurality of first members 36Z so that the plurality of convex portions 36Z_3 of the first member 36Z and the plurality of concave portions 37Z_3 of the second member 37 fit into each other. It becomes possible to install 37Z. The shapes of the convex portion 36Z_3 and the concave portion 37Z_3 are not particularly limited as long as they fit each other.

第４実施形態に係るボルト３５の構成によれば、１つの第２部材３７Ｚで、複数の第１部材３６Ｚを覆うことができるため、相対的な第２部材３７Ｚの体積を増やすことができ、磁場調整効果をより高めることが可能になる。 According to the configuration of the bolt 35 according to the fourth embodiment, since one second member 37Z can cover a plurality of first members 36Z, the relative volume of the second member 37Z can be increased. It becomes possible to further enhance the magnetic field adjustment effect.

第４実施形態に係る電磁石装置７０によれば、第１実施形態と同様に、第２部材３７Ｚの体積量などを調整することで、磁場の乱れを調整することができる。また、第４実施形態に係る電磁石装置７０によれば、励磁状態であっても、作業者が高磁場の影響を受けることなく磁場調整作業を行うことができる。 According to the electromagnet device 70 according to the fourth embodiment, the turbulence of the magnetic field can be adjusted by adjusting the volume amount of the second member 37Z and the like as in the first embodiment. Further, according to the electromagnet device 70 according to the fourth embodiment, the operator can perform the magnetic field adjusting work without being affected by the high magnetic field even in the excited state.

≪第５実施形態≫
図７Ａ及び図７Ｂを参照して、第５実施形態に係るボルト３５の構成について、説明する。なお、超伝導コイル３３、ヨーク構造体などに対するボルト３５の相対的な配置は、第１実施形態を参照できる。 << Fifth Embodiment >>
The configuration of the bolt 35 according to the fifth embodiment will be described with reference to FIGS. 7A and 7B. The relative arrangement of the bolt 35 with respect to the superconducting coil 33, the yoke structure, and the like can be referred to the first embodiment.

図７Ａ及び図７Ｂに示すように、ボルト３５は、第１部材３６Ｐと、第２部材３７Ｐと、を備えている。 As shown in FIGS. 7A and 7B, the bolt 35 includes a first member 36P and a second member 37P.

第１部材３６Ｐは、例えば、いもネジで構成される。
第１部材３６Ｐは、磁極構造体３２とヨーク天板３１ａとを締結する、或いは、ヨーク天板３１ａとヨーク天板３１ｂとを締結する。即ち、第１部材３６Ｐは、係合部５１及び係合部５３の段差部分を介して、磁極構造体３２とヨーク天板３１ａとの両者を固定する、或いは、ヨーク天板３１ａとヨーク天板３１ｂとの両者を固定する。
磁場調整の作業者は、第１部材３６Ｐを、例えば、レンチ（ネジ回し）などで回転させることで、磁極構造体３２に設けられた貫通孔に、第１部材３６をねじ込む。或いは、磁場調整の作業者は、第１部材３６Ｐを、例えば、レンチ（ネジ回し）などで回転させることで、ヨーク天板３１ａに設けられた貫通孔に、第１部材３６をねじ込む。 The first member 36P is composed of, for example, a potato screw.
The first member 36P fastens the magnetic pole structure 32 and the yoke top plate 31a, or fastens the yoke top plate 31a and the yoke top plate 31b. That is, the first member 36P fixes both the magnetic pole structure 32 and the yoke top plate 31a via the stepped portions of the engaging portion 51 and the engaging portion 53, or the yoke top plate 31a and the yoke top plate 31a. Both with 31b are fixed.
The operator of the magnetic field adjustment screwes the first member 36 into the through hole provided in the magnetic pole structure 32 by rotating the first member 36P with, for example, a wrench (screw turn). Alternatively, the operator of the magnetic field adjustment screwes the first member 36 into the through hole provided in the yoke top plate 31a by rotating the first member 36P with, for example, a wrench (screw turn).

第２部材３７Ｐは、例えば、円柱形状の鉄片で構成される。
第２部材３７Ｐは、磁極構造体３２と第１部材３６Ｐとの高さの差によって生じる隙間に挿入される。或いは、第２部材３７Ｐは、ヨーク天板３１ａとと第１部材３６Ｐとの高さの差によって生じる隙間に挿入される。 The second member 37P is composed of, for example, a cylindrical iron piece.
The second member 37P is inserted into the gap created by the difference in height between the magnetic pole structure 32 and the first member 36P. Alternatively, the second member 37P is inserted into the gap created by the difference in height between the yoke top plate 31a and the first member 36P.

第５実施形態に係るボルト３５の構成によれば、いもネジ及び円柱形状の鉄片の組み合わせによって、磁束密度の高い部位に、第２部材３７Ｐを設置することができるため、磁場調整効果を効率的に高めることが可能になる。 According to the configuration of the bolt 35 according to the fifth embodiment, the second member 37P can be installed in a portion having a high magnetic flux density by the combination of the potato screw and the cylindrical iron piece, so that the magnetic field adjustment effect is efficient. It will be possible to increase to.

第５実施形態に係る電磁石装置７０によれば、第１実施形態と同様に、第２部材３７Ｐの体積量などを調整することで、磁場の乱れを調整することができる。また、第５実施形態に係る電磁石装置７０によれば、励磁状態であっても、作業者が高磁場の影響を受けることなく磁場調整作業を行うことができる。 According to the electromagnet device 70 according to the fifth embodiment, the turbulence of the magnetic field can be adjusted by adjusting the volume amount of the second member 37P and the like as in the first embodiment. Further, according to the electromagnet device 70 according to the fifth embodiment, the operator can perform the magnetic field adjusting work without being affected by the high magnetic field even in the excited state.

なお、本発明は、以上に説明した実施形態および変形例に限定されるものではなく、さらに、様々な変形例が含まれる。例えば、前記した実施形態および変形例は、本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態や変形例の構成の一部を、他の実施形態や変形例の構成に置き換えることが可能であり、また、ある実施形態や変形例の構成に他の実施形態や変形例の構成を加えることも可能である。また、各実施形態や変形例の構成の一部について、他の実施形態や変形例に含まれる構成を追加・削除・置換することも可能である。 The present invention is not limited to the embodiments and modifications described above, and further includes various modifications. For example, the above-described embodiments and modifications have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. Further, it is possible to replace a part of the configuration of a certain embodiment or modification with the configuration of another embodiment or modification, and the configuration of a certain embodiment or modification can be replaced with another embodiment or modification. It is also possible to add the configuration of. Further, it is also possible to add / delete / replace the configuration included in other embodiments or modifications with respect to a part of the configurations of each embodiment or modification.

１０中心軸
２６開口部
２８外面
３１ヨーク天板（ヨーク端板）
３２磁極構造体
３３超伝導コイル
３４ヨーク側板
３５ボルト
３６第１部材
３６＿３、３６Ｙ＿３凸部
３６Ｘ＿３雄ネジ
３６Ｐいもネジ
３７第２部材
３７＿３、３７Ｙ＿３凹部
３７Ｘ＿３雌ネジ
３７Ｐ円柱形状の鉄片
５５脚部
６０ボルト
７０電磁石装置 10 Central axis 26 Opening 28 Outer surface 31 York top plate (yoke end plate)
32 Magnetic pole structure 33 Superconducting coil 34 York side plate 35 Bolt 36 First member 36_3, 36Y_3 Convex part 36X_3 Male screw 36P Imo screw 37 Second member 37_3, 37Y_3 Recessed 37X_3 Female screw 37P Cylindrical iron piece 55 Leg 60 Electromagnet device

Claims

With a superconducting coil
A yoke end plate having an opening and provided on one end surface side of the superconducting coil,
A magnetic pole structure attached to the opening and collecting the magnetic flux generated by the superconducting coil,
A first member for fastening the yoke end plate and the magnetic pole structure, and
With a plurality of second members interchangeably attached to the first member and having different volumes ,
An electromagnet device characterized by being equipped with.

The first member and the second member
A plurality of superconducting coils are provided along the circumferential direction.
The electromagnet device according to claim 1.

The first member has a convex portion on the surface and has a convex portion.
The second member has a concave portion at a position facing the convex portion.
The electromagnet device according to claim 1 or 2, wherein the electromagnet device is characterized in that.

The shape of the convex portion and the concave portion is an inverted truncated cone shape.
The electromagnet device according to claim 3.

The first member has a male screw on the surface and has a male screw.
The second member has a female screw at a position facing the male screw.
The electromagnet device according to claim 1 or 2, wherein the electromagnet device is characterized in that.

Further provided with bolts for fastening the divided second member.
The electromagnet device according to any one of claims 1 to 5, wherein the electromagnet device is characterized.

The second member is provided so as to face the plurality of the first members.
The electromagnet device according to any one of claims 1 to 6, wherein the electromagnet device is characterized.

The first member is a potato screw.
The second member is a cylindrical iron piece.
The electromagnet device according to claim 1 or 2, wherein the electromagnet device is characterized in that.

The yoke end plate is divided and configured.
The electromagnet device according to any one of claims 1 to 8, wherein the electromagnet device is characterized.

Further, a tubular yoke side plate provided so as to surround the side surface of the superconducting coil along the circumferential direction of the superconducting coil is provided.
The yoke end plate, the magnetic pole structure, and the yoke side plate are made of a magnetic material.
The electromagnet device according to any one of claims 1 to 9, wherein the electromagnet device is characterized.