JP2014200428A - Uniform magnetic field generation electromagnet device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve adjustment efficiency of a uniform magnetic field generation electromagnet device, and to achieve space saving of the device.SOLUTION: In a uniform magnetic field generation electromagnet device 1, a plurality of electromagnet units MU1-MU6 are aligned and held such that central axes of electromagnets EM1-EM8 of the respective electromagnet units MU1-MU 6 are coaxially positioned. In each of the electromagnets EM1-EM8, a winding is wound by alpha winding such that both of terminal portions 3a, 3b of a winding start and a winding end of each of the electromagnets EM1-EM8 are pulled out from the outer circumference of each coil 3.

Description

  The present invention relates to a uniform magnetic field generating electromagnet apparatus that can be suitably used as an electromagnet apparatus for a biological measurement apparatus that obtains a tissue image of a living body using various magnetic resonances such as electron spin resonance and nuclear magnetic resonance.

In a living body measuring apparatus using this type of magnetic resonance, a uniform magnetic field generating electromagnet apparatus that generates a uniform magnetic field is used as a static magnetic field generating source having high intensity and high uniformity (on the order of several ppm) and stable in time. ing.
In particular, a uniform magnetic field generating electromagnet apparatus used in a magnetic resonance imaging apparatus (MRI (Magnetic Resonance Imaging) apparatus) captures a precise and high-contrast biological tomographic image at a high speed and also acquires an imaging space for acquiring a high-functional image. In the spherical space (for example, 40 cm in diameter) in the center of the electromagnet, the temporal stability of the magnetic field and the magnetic field uniformity (position) are required on the order of several ppm (for example, see Patent Document 1). In order to achieve such high magnetic field uniformity, it is common to optimally arrange a plurality of coils, optimize the designed magnetic field uniformity by magnetic field analysis, and deal with the design.

  However, even if rigorous optimization is carried out and uniform magnetic field generating electromagnet devices are manufactured and assembled as designed, in practice, depending on the dimensional tolerance at the time of manufacture and the characteristics of the applied material, it may actually be several hundred to several thousand ppm. May be uneven. Therefore, such non-uniformity makes the magnetic field uniform by performing magnetic field correction in the manufacturing process. As the method, a method using a mechanical shim that adjusts the relative positional relationship of the coils, a passive shimming method that controls the magnetic field distribution by arranging a magnetic material (see, for example, Patent Document 2), and auxiliary coils other than the main coil are equally provided. In general, a method using an active shim coil that is arranged in a magnetic field generating electromagnet device and forms a magnetic field by energizing the electromagnet device to correct magnetic field inhomogeneity is used. For example, in the technique described in Patent Document 1, in order to adjust the magnetic field uniformity, a small piece of magnetic material is attached to the bore inner wall of the magnet for adjustment.

Japanese Patent Laid-Open No. 10-262947 JP 2009-273930 A (3rd page, paragraph 0004)

  However, it is desirable that the correction of the magnetic field in the manufacturing process should be minimized as much as possible, and the correction operation should be carried out efficiently by bringing it as close as possible to the design target only by assembling the reference position. In addition, magnetic field adjustment is an operation that repeats measurement and adjustment, and therefore, inevitably becomes a craftsman's work due to the accumulation of know-how in the field. Therefore, in order to improve the adjustment efficiency of the uniform magnetic field generating electromagnet device, it is also necessary to reduce craftsman work.

  Here, in order to solve such a problem of improving the adjustment efficiency, it is effective to manufacture a coil manufactured by winding as accurately as possible in order to improve the magnetic field uniformity. Moreover, since the crossover wiring that connects adjacent coils does not contribute to the uniformity of the magnetic field in terms of design, it is also effective not to bring the wiring close to the region where the specimen is imaged, where the uniformity of the magnetic field is important. It is also effective to consider the rigidity of the crossover wiring so that the position of the adjacent coil does not change when adjusting the mechanical shim for adjusting the relative positions of the plurality of coils.

  In order to save space in the uniform magnetic field generating electromagnet device, it is effective to reduce the size of the electromagnet. However, in order to reduce the size of the electromagnet, the current density is made as high as possible. For this reason, in a normal conducting uniform magnetic field generating electromagnet device, each coil is independently surrounded by a cooling water region defined by a cooling water tank, and the coil is directly immersed in the cooling water in the cooling water region. To do.

  However, since it is necessary to individually adjust the position of each coil in the crossover wiring portion between the plurality of coils, each coil is structured to be surrounded by a cooling water region defined by a cooling water tank independently. Therefore, since the crossover wiring portion between the coils is exposed to the air, it is necessary to increase the cross-sectional area of the conductor of the crossover wiring portion so that there is no problem even with air cooling.

On the other hand, when the cross-sectional area of the conductor of the transition wiring portion becomes large, if the connection portion between the transition wiring and the coil is arranged inside the coil, the space of the imaging area is taken into account, including the space of the gradient magnetic field coil and the reception / transmission coil. There is a problem that is limited. Moreover, since the crossover wiring between the coils must be drawn from the cooling water, there is a problem that a sealing property is required for a portion drawn from the cooling water tank (cooling water region).
Accordingly, the present invention has been made paying attention to the above-described problems, and an object thereof is to provide a uniform magnetic field generating electromagnet device capable of improving adjustment efficiency and realizing space saving of the device. And

  In order to solve the above-described problems, an equivalent magnetic field generating electromagnet device according to one aspect of the present invention is configured such that a coil is formed by winding a peripheral winding side of an annular winding core bar to form the coil. And a plurality of electromagnets configured to position and sandwich one or more of the plurality of electromagnets with a pair of support plates having a central opening, the plurality of electromagnet units configured by the coils. A plurality of electromagnet units, the central axes of the electromagnets being coaxial with each other. The uniform magnetic field generating electromagnet device is arranged and held so as to be positioned at both ends of the coil at the beginning and end of winding. Wherein the windings so as to be drawn et is wound.

  With such a configuration, the electromagnet is a so-called α-winding in which the winding is wound so that both of the coil winding start and winding end portions are drawn from the outer periphery of the coil. Therefore, compared to the normal winding in which the winding start is drawn from the inside of the coil, there is no cross point in the winding, so that it can be wound in a perfect circle, and the clearance in the thickness direction can be reduced. . Therefore, a highly efficient and high performance electromagnet can be obtained. In addition, the coil can be manufactured more accurately and more compactly, the crossover wiring can be kept away from the area where the specimen is imaged, and the space of the imaging area is limited by the crossover wiring. Does not occur. Therefore, adjustment efficiency can be improved and space saving of the apparatus can be realized.

  Here, in the uniform magnetic field generating electromagnet device according to one aspect of the present invention, the uniform magnetic field generating electromagnet device is provided in an annular shape on the outer peripheral portion of the coil so as to surround each coil in the plurality of electromagnet units. A cooling water region is provided, and the electromagnet has both the coil winding start and winding end portions drawn out into the cooling water region and is also used as a relay conductor in the cooling water region. If it is connected and connected to the transition wiring via the relay conductor, each coil is independently surrounded by the cooling water region, and the coil is directly immersed in the cooling water in the cooling water region. In the uniform magnetic field generating electromagnet device, it is suitable as a configuration in which wiring is connected to the terminal portion of the coil that is α-wound.

  The relay conductor includes a first relay conductor having one end connected to the end portion in the cooling water region, a third relay conductor having one end connected to the crossover wiring, and the first and first relay conductors. A second relay conductor connecting the other ends of the three relay conductors, and the second relay conductor has a columnar portion, and the columnar portion is supported by the support A circular through hole formed in the plate is inserted from the inside of the cooling water region to a region outside the cooling water region, and is connected to the transition wiring via the third relay conductor in the region outside the cooling water region. If it is, it is more suitable as a structure which connects wiring over the terminal part of the coil located in a cooling water area | region.

Further, the cylindrical portion of the second relay conductor is cooled if an O-ring is mounted at a position facing the inner peripheral surface of the through hole of the support plate so that cooling water can be sealed. Since the water sealing property can be improved, it is more preferable as a configuration in which the wiring is connected to the terminal portion of the coil located in the cooling water region.
In addition, the electromagnet is pulled out from the upper position in the cooling water region from the central axis of the electromagnet unit, and the upper end of each electromagnet unit is extended from the center axis of the electromagnet unit. If it is connected to the crossover wiring arranged so as to straddle, it is more suitable for saving the installation space of the apparatus.

Furthermore, in the uniform magnetic field generating electromagnet device according to an aspect of the present invention, if the crossover wiring is a flexible stranded copper wire, the adjacent coil is adjusted during mechanical shim adjustment for adjusting the relative position of the coils. Therefore, it is more suitable for improving the adjustment efficiency.
Moreover, in the uniform magnetic field generating electromagnet device according to one aspect of the present invention, when the coil of the electromagnet is a flat conducting wire, the accuracy of the inner and outer diameters of the coil is improved compared to a conducting wire having a circular cross section. Therefore, since it is closer to a perfect circle, the adjustment efficiency is improved by reducing the magnetic field adjustment range, and the winding can be wound with high density, so that more efficient and high-performance electromagnets can be obtained while saving equipment space. Is more suitable for realizing the above.

  As described above, according to the present invention, it is possible to improve the adjustment efficiency of the uniform magnetic field generating electromagnet device and to save the space of the device.

1 is a perspective view showing an overall configuration of a uniform magnetic field generating electromagnet device according to the present invention. It is sectional drawing of the uniform magnetic field generation electromagnet apparatus which concerns on this invention, The figure has shown the longitudinal cross-section containing an axis line. It is the fragmentary figure which expands and shows the principal part (coil terminal part) of an electromagnet unit, In the same figure, the support plate and cooling water tank of a near side are not displayed. It is the fragmentary figure which expands and shows the principal part (coil terminal part) of an electromagnet unit, In the same figure, the cooling water tank is not displayed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a uniform magnetic field generating electromagnet apparatus applied to a living body measuring apparatus that obtains a tissue image of a living body using various magnetic resonances such as electron spin resonance and nuclear magnetic resonance. This uniform magnetic field generating electromagnet device 1 is configured to have a plurality of electromagnets for generating a magnetic field, and in the example of this embodiment, as shown in a sectional view in FIG. 2, eight electromagnets formed in an annular shape are shown. EM1 to EM8 are arranged coaxially. Here, the electromagnets EM1, EM2, EM7, and EM8 arranged on both end sides in the axial direction shown in FIG. 2 are set to have small inner diameters and outer diameters. The inner diameter is sufficient to pass through.

  In addition, the electromagnets EM3 and EM6 disposed on the inner side in the axial direction of the electromagnets EM2 and EM7 are set to a medium level in which both the inner diameter and the outer diameter are larger than those of the electromagnets EM1, EM2, EM7, and EM8. Furthermore, the electromagnets EM4 and EM5 disposed on the inner side in the axial direction of the electromagnets EM3 and EM6, that is, the central portion in the axial direction, are both set to have larger inner diameters and outer diameters than the electromagnets EM3 and EM6. Therefore, the electromagnets EM1, EM2, EM7, and EM8, the electromagnets EM3 and EM6, and the electromagnets EM4 and EM5 are set to different constants.

  The electromagnets EM <b> 1 to EM <b> 8 are wound on the outer peripheral surface side of the winding core metal 2 corresponding to each diameter to form the coil 3, and the coil 3 is attached and fixed to the outer peripheral surface of the winding core metal 2. Thus, an electromagnet that generates a magnetic field composed of the winding cored bar 2 and the coil 3 is formed. As shown in FIGS. 2 and 4, the winding cored bar 2 is formed with engaging protrusions 2b and 2c that protrude in the axial direction, as shown in FIGS. Only the left end winding cored bar 2 is labeled). Toroidal grooves 2e and 2f for accommodating O-rings 4a and 4b are formed on the outer peripheral surface side of the engaging protrusions 2b and 2c. A seal portion is formed by the engagement protrusions 2b and 2c and the O-rings 4a and 4b, thereby preventing water leakage from the inner peripheral side of the cooling water region defined by cooperation with the cooling water tank 10 described later. It is prevented.

  The coil 3 sandwiches the winding core 2 from both sides with a winding jig (not shown), and attaches this to a winding machine for alpha winding (α winding) (not shown), thereby winding the winding core. A winding having a predetermined number of turns is applied to the outer peripheral side of the gold 2 by alpha winding, and is formed in an annular shape on the outer peripheral side of the core metal 2 for winding. As a result, the electromagnets EM1 to EM8 are wound so that both the winding start and winding end portions 3a and 3b (see FIG. 3) of the coil 3 are drawn from the outer periphery of the coil 3. It is wound. Each coil 3 is attached to a winding jig, and is impregnated with a varnish serving as an insulating material between the windings of the coil 3 by, for example, a vacuum pressure varnish impregnation treatment, and the windings of the coil 3 are fixed. In addition, it is preferable to perform the annealing process which removes the residual stress by the tension | tensile_strength at the time of winding with a winding machine, if needed. The residual stress of the coil 3 is removed by the annealing process, and the mounting accuracy to the winding core 2 can be maintained for a long time.

As shown in FIGS. 1 and 2, the electromagnets EM1 to EM8 are sandwiched from both sides in the axial direction by a pair of substantially square support plates P1a, P1b, to P6a, P6b. MU1 to MU6 are configured.
Each of the support plates P1a to P6a and P1b to P6b is formed in the same shape with high precision, and each has a central opening 5 and a large number of through holes 6 as shown in FIGS. Has been. A large number of through holes 6 are formed so as to penetrate on the same axis in the axial direction with a predetermined interval in the circumferential direction with reference to the central opening 5 of each support plate. The through hole 6 is formed in the vicinity of the inner periphery and the outer periphery of the electromagnets EM1 to EM8 at a position that does not interfere with other components. In addition, the through-hole 6 formed in the outermost periphery position among many through-holes 6 is a hole for inserting the positioning shaft (through bolt) (not shown).

  In addition, each of the support plates P1a to P6a and P1b to P6b is positioned at each of the pair of electromagnet units MU1 to MU6 that are paired and positioned at positions facing the positioning bushes 27 and 28 (see FIG. 2). It has a positioning structure for positioning in the radial direction composed of a cylindrical member (not shown). Each of the support plates P1a to P6a and P1b to P6b is engaged with the engagement protrusions 2b and 2c of the winding core metal 2 constituting the electromagnets EM1 to EM8, as shown in FIGS. An annular engaging groove 7 is formed, and a flat surface 8 is formed which is connected to the outer peripheral side of the engaging groove 7 and contacts both end faces facing the axial direction of the coils 3 of the electromagnet units MU1 to MU6. .

  Further, each of the support plates P1a to P6a and P1b to P6 is more than the outer peripheral edge of the coil 3 with the engagement protrusions 2b and 2c of the winding core metal 2 engaged with the engagement groove 7. The fitting step part 9 which the axial direction both ends of the annular | circular shaped cooling water tank 10 shown in FIG. 2 fit is formed in the outer position.

  Here, as shown in FIG. 2, each of the cooling water tanks 10 has a peripheral wall surface that prevents the cooling water that immerses the coil 3 from leaking to the outside when the electromagnet units MU <b> 1 to MU <b> 6 are water-cooled. The coils 3 of the electromagnets EM1 to EM8 are enclosed in an annular shape and attached to each unit. That is, the cooling water tank 10 is configured by an annular frame having an inner diameter larger than the outer diameter of each of the electromagnets EM1 to EM8, and joint portions 10a and 10b (for supplying and discharging cooling water) above and below itself. The cooling water tank 10 at the right end in FIG. 2 is provided with a reference numeral), and an O-ring or sealing adhesive is provided on the contact surface with the fitting step 9 of the support plates P1a, P1b, .about.P6a, P6b. By performing sealing, etc., a cooling water region (a part indicated by R in FIG. 2) provided in an annular shape on the outer peripheral part of the coil 3 is defined inside the peripheral wall surface of the cooling water tank 10.

  As shown in FIG. 2, the electromagnets EM1 and EM2 are clamped while being positioned by the positioning structure of the pair of support plates P1a and P1b, and the numerous through holes 6 are bolts and nuts 4 (see FIG. 1). By tightening in the axial direction, the electromagnets EM1 and EM2 are positioned and fixed between the support plates P1a and P1b at a predetermined position to constitute the electromagnet unit MU1. Similarly, the electromagnets EM7 and EM8 are sandwiched by bolts and nuts between a pair of support plates P6a and P6b to constitute an electromagnet unit MU6. Further, the electromagnets EM3, EM4, EM5, and EM6 are respectively sandwiched by a pair of support plates P2a, P2b, P3a, P3b, P4a, P4b and P5a, P5b by bolts and nuts, respectively, and electromagnet units MU2, MU3, MU4 and MU5 are configured.

  Then, as shown in FIG. 2, the cylinders that perform axial positioning at the positions of the positioning bushes 27 and 28 between the support plates adjacent to the support plates P1a, P1b to P6a, and P6b of the electromagnet units MU1 to MU6, respectively. With a member (not shown) arranged coaxially with the positioning bushes 27, 28, a positioning shaft (through bolt) (not shown) is placed coaxially at the outermost position over the entire electromagnet units MU1 to MU6. By inserting the formed through-hole 6, the entire electromagnet units MU <b> 1 to MU <b> 6 are positioned and aligned in the radial direction and the axial direction.

  In the aligned state of the electromagnet units MU1 to MU6, as shown in FIG. 2, the lower ends of the support plates P1a, P1b to P6a and P6b constituting the electromagnet units MU1 to MU6 are connected to the bases for the electromagnet units MU1 to MU6. Each of the electromagnet units MU1 to MU6 has six pieces AM1 to AM6, but the base plates AM2 to AM6 are not shown). Here, the base plate AM has a two-dimensional position adjustment mechanism capable of finely adjusting the axial position of each electromagnet unit MU1 to MU6 and the position orthogonal to the axial direction individually. The base plate AM is finely adjusted in the axial direction and in the direction orthogonal to the axial direction individually by the two-dimensional position adjusting mechanism, with the positioning shafts pulled out, and individually on the base plate AM1 to AM6. It is possible to do.

  Here, as shown in FIG. 1, each of the electromagnet units MU <b> 1 to MU <b> 6 has a plurality of connecting wires PW <b> 1 at the terminal portions at the start and end of winding of the coils 3 so that the adjacent coils 3 are connected in series. Are connected in series by PW6. In the example of this embodiment, a flexible twisted copper wire is used for the crossover wirings PW1 to PW6, and the outer skin is covered with an insulating member. The electromagnets EM1 to EM8 are such that the end portions 3a and 3b (see FIG. 3) at the beginning and end of winding of the coil 3 are the central axes of the electromagnet units MU1 to MU6 (the axis of the central opening 5). It is drawn from the upper position in the cooling water region R than the center). Furthermore, as shown in FIG. 1, all of the terminal portions 3a and 3b (see FIG. 3) are connected by connecting wires PW1 to PW6 arranged so as to straddle the upper portions of the electromagnet units MU1 to MU6. .

  Here, the principal part (coil terminal part 3a, 3b) of the structure based on this invention is shown in FIG. 3 and FIG. 3 and 4 are diagrams corresponding to a part of the electromagnet units MU2 to MU5. However, in the present invention, the end portions 3a and 3b at the beginning and end of winding of the coil 3 are shown. Since the configuration is commonly applied to all the electromagnet units MU1 to MU6, the illustration and description of the electromagnet units MU1 and MU6 are omitted.

  As shown in FIG. 3 and FIG. 4, in the example of this embodiment, each of the electromagnets EM <b> 1 to EM <b> 8 has both the winding start and winding end portions 3 a and 3 b of its own coil 3 in the cooling water region R. And is connected to the relay conductor 30 in the cooling water region R, and is connected to the transition wires PW1 to PW6 via the relay conductor 30. In the example of the present embodiment, the relay conductor 30 has a short rectangular parallelepiped first relay conductor 31 whose one end is directly connected to the coil terminal portions 3a and 3b, which are rectangular conductors, and one end directly to the transition wires PW1 to PW6. It has a long rectangular parallelepiped third relay conductor 33 to be connected, and a second relay conductor 32 that connects the other end of the first relay conductor 31 and the other end of the third relay conductor 33 to each other. The first to third relay conductors 31, 32, 33 are connected to each other by screws.

  Here, as shown in FIG. 4, among the relay conductors 31, 32, 33, the second relay conductor 32 is formed in a cylindrical shape. And while the 1st relay conductor 31 is arrange | positioned along the circumferential direction of the coil 3 at the rectangular parallelepiped long axis direction, the 2nd relay conductor 32 has the column-shaped axis line for each electromagnet unit MU1. It is arrange | positioned along the direction of the center axis | shaft of MU6, and, as for the 2nd relay conductor 32, the end surface of the own axis | shaft has faced the support plate (it is set as the typical code | symbol P).

  Furthermore, the second relay conductor 32 is connected from the first relay conductor 31 in the cooling water region R to the third relay conductor 33 outside the cooling water region R through a circular through hole Pm formed in the support plate P. As a result, the third relay conductor 33 is connected to the crossover wiring (represented by the reference symbol PW) outside the cooling water region R. The cylindrical second relay conductor 32 is provided with an O-ring on the peripheral surface portion facing the inner peripheral surface of the through hole Pm of the support plate P so that cooling water can be sealed. The long rectangular parallelepiped third relay conductor 33 is arranged such that its major axis direction is substantially along the radial direction of the coil 3, and the length of the major axis is connected to the connecting wires PW1 to PW6. The length of the support plate P is longer than the peripheral surface of the support plate P.

Next, the operation | movement of the said embodiment, an effect | action, and an effect are demonstrated.
In the manufacturing process, the uniform magnetic field generating electromagnet apparatus 1 is provided with the electromagnet units MU1 to MU6 mounted on the base plates AM (AM1 to AM6) and positioned at the intended positions, and the electromagnet units MU1 to MU6. The electromagnets EM1 to EM8 are aligned so that the central axes thereof are coaxially arranged, and the coil 3 of each of the electromagnet units MU1 to MU6 is energized within a spherical space (for example, 40 cm in diameter) in the electromagnet central portion that is the imaging space. Measure the magnetic field uniformity.

  When the magnetic field uniformity is within a predetermined range (several ppm or less), magnetic field adjustment is not necessary. On the other hand, when the coils 3 of the electromagnet units MU1 to MU6 are energized, the result of measuring the magnetic field uniformity in the spherical space at the electromagnet central portion that is the imaging space exceeds a predetermined range (several ppm or less). When the magnetic field is adjusted, the magnetic field uniformity in the spherical space is measured within a predetermined range (several ppm or less) by, for example, a two-dimensional position adjusting mechanism of the base plate AM (AM1 to AM6). Make adjustments.

  Here, in the uniform magnetic field generating electromagnet apparatus 1 of the present embodiment, the electromagnets EM1 to EM8 are each of the winding start and winding end portions 3a and 3b (see FIG. 3) of its own coil 3. Since the winding is wound with α winding so as to be drawn from the outer periphery of its own coil 3, the winding start is true because no cross point is generated in the winding compared to the normal winding drawn from the inside of the coil. It can be wound into a circle, and the thickness direction clearance can be reduced. Therefore, the electromagnets EM1 to EM8 can be made highly efficient and high performance. In addition, the coil 3 can be manufactured more accurately and more compactly than a normal winding, and the wiring can be kept away from the area where the specimen is imaged. Since the winding is wound with α winding so as to be drawn out from the above, there is no problem that the space of the imaging region is limited by the above-described transition wirings PW1 to PW6. Accordingly, it is possible to improve the efficiency of the magnetic field adjustment and to save the space of the apparatus.

  Further, the uniform magnetic field generating electromagnet device 1 includes a cooling water region R provided in an annular shape on the outer periphery of each of the coils 3 so as to surround each of the plurality of electromagnet units MU1 to MU6, and the electromagnet EM1. -EM8 is such that both of the winding start and end terminal portions 3a and 3b of its own coil 3 are drawn out into the cooling water region R and connected to the relay conductor 30 in the cooling water region R. Since it is connected and connected to the crossover wirings PW1 to PW6 via the relay conductor 30, each coil 3 is independently surrounded by the cooling water region R, and the coil 3 is the cooling water in the cooling water region R. Is suitable as a configuration in which the wirings PW1 to PW6 are connected to the terminal portions 3a and 3b of the coil 3 that is α-wound.

  Further, according to the uniform magnetic field generating electromagnet device 1, the relay conductor 30 is composed of a plurality of relay conductors 31, 32, 33, and the second relay conductor 32 is formed in a cylindrical shape, and is attached to the support plate P. Since it is connected to the transition wiring PW outside the cooling water region R from the inside of the cooling water region R through the formed circular through hole Pm, it crosses over the terminal portions 3a and 3b of the coil 3 located in the cooling water region R. It is more suitable as a configuration for connecting the wirings PW1 to PW6.

  Further, according to the uniform magnetic field generating electromagnet device 1, the cylindrical second relay conductor 32 can seal the cooling water on the peripheral surface portion facing the inner peripheral surface of the through hole Pm of the support plate P so as to seal the cooling water. 37 is installed, the sealing property of the cooling water can be improved, and the wirings PW1 to PW6 are further connected to the terminal portions 3a and 3b of the coil 3 located in the cooling water region R. Is preferred.

  In addition, according to the uniform magnetic field generating electromagnet device 1, the electromagnets EM1 to EM8 are configured such that both the winding start and winding end portions 3a and 3b of the coil 3 are more than the central axis of the electromagnet units MU1 to MU6. Since it is pulled out from the position of the upper part in each cooling water area | region R and is connected to the crossover wiring PW1-PW6 arrange | positioned so that the upper part of each electromagnet unit MU1-MU6 may be straddled, installation of the uniform magnetic field generation electromagnet apparatus 1 is carried out Space can be further saved.

Furthermore, according to this uniform magnetic field generating electromagnet device 1, since flexible twisted conductors are used as the transition wires PW1 to PW6, they are adjacent at the time of mechanical shim adjustment for adjusting the relative positions of the coils 3. Since the position change of the coil 3 is prevented or suppressed, the adjustment efficiency can be further improved.
In addition, according to the uniform magnetic field generating electromagnet device 1, the coil 3 of the electromagnets EM1 to EM8 uses a rectangular conductor for its winding, and therefore the accuracy of the inner and outer diameters of the coil 3 compared to a conductor having a circular cross section. Can be improved and can be made closer to a perfect circle. Therefore, the magnetic field adjustment range can be reduced to improve adjustment efficiency, and the winding can be wound with high density, so that space saving of the apparatus can be realized while obtaining highly efficient and high performance electromagnets EM1 to EM8. be able to.

  The uniform magnetic field generating electromagnet device according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the case where the uniform magnetic field generating electromagnet apparatus 1 is configured from the six electromagnet units MU1 to MU6 using the eight electromagnets EM1 to EM8 has been described, but the present invention is not limited thereto, The number of units and electromagnets used can be set arbitrarily.

  Further, for example, in the above embodiment, an example in which the electromagnet units MU1 and MU6 are configured by supporting the electromagnets EM1 and EM2 and the electromagnets EM7 and EM8 with a pair of support plates P1a and P1b and a pair of support plates P6a and P6b, respectively. However, not limited to this, the electromagnet unit may be configured by individually supporting the electromagnets EM1, EM2, EM7, and EM8 with a pair of support plates.

  Moreover, for example, in the above-described embodiment, the example in which the varnish impregnation treatment is performed after forming the coil 3 that is α-wound with a flat wire on the outer peripheral side of the winding core metal 2 using a winding jig has been described. However, the present invention is not limited to this, and the varnish impregnation treatment can be omitted when the shape of the coil 3 does not collapse after winding depending on the type of winding. Similarly, when the residual stress of the coil 3 is small, the annealing process can be omitted. Moreover, it is good also as a conducting wire with a circular cross section instead of a flat conducting wire. However, if the winding of the coil 3 is a flat wire, the accuracy of the inner and outer diameters of the coil 3 is improved compared to a wire having a circular cross section, so that it is closer to a perfect circle. Since the winding can be wound at a high density, it is more suitable for realizing space saving of the apparatus while obtaining a highly efficient and high performance electromagnet.

For example, in the said embodiment, although demonstrated by the example using the flexible twisted conducting wire as the connecting wiring PW1-PW6, not only this but a various conducting wire can be used as a connecting wiring. However, if the crossover wiring is a flexible stranded conductor, the position change of adjacent coils is prevented or suppressed during adjustment of the mechanical shim that adjusts the relative positions of the coils, thereby improving adjustment efficiency. More preferred above.
Further, for example, in the above-described embodiment, the uniform magnetic field generating electromagnet apparatus 1 has been described as an example of cooling by the water cooling method including the cooling water region R provided in an annular shape around the coil so as to surround the coil 3. However, the present invention is not limited to this, and the cooling water tank 10 can be omitted when a cooling method using a refrigerant other than liquid is employed.

DESCRIPTION OF SYMBOLS 1 Uniform magnetic field generating electromagnet apparatus 2 Core wire for winding 3 Coil 4 Bolt and nut 5 Center opening 6 Through hole 7 Engaging groove 8 Flat surface 9 Fitting step part 10 Cooling water tank 20 Spacer 30 Relay conductor 31 First relay conductor 32 Second relay conductor 33 Third relay conductor 35 Terminal 37 O-ring EM1 to EM8 Electromagnet MU1 to MU6 Electromagnet unit PW1 to PW6 Crossover wiring

Claims (7)

A plurality of electromagnets that form a coil by winding the outer periphery of an annular winding cored bar to generate a magnetic field composed of the winding cored bar and the coil, and one of the plurality of electromagnets A plurality of electromagnet units configured by positioning and sandwiching one or a plurality of them by a pair of support plates having a central opening, and windings of the coil windings so that adjacent coils of each of the electromagnet units are connected in series. A uniform magnetic field generating electromagnet device comprising a crossover wiring connecting a terminal portion at the beginning and the end of winding, wherein the plurality of electromagnet units are aligned and held so that a central axis of the electromagnet is coaxially located;
The electromagnet device according to claim 1, wherein the electromagnet is wound so that both of the winding start and winding end portions are drawn from the outer periphery of the coil. The uniform magnetic field generating electromagnet device includes a cooling water region provided in an annular shape on an outer peripheral portion of the coil so as to surround each coil in the plurality of electromagnet units,
In the electromagnet, both of the winding start and winding end terminal portions are drawn out into the cooling water region, and are connected to a relay conductor in the cooling water region. The uniform magnetic field generating electromagnet device according to claim 1, wherein the uniform magnetic field generating electromagnet device is connected to the crossover wiring.   The relay conductor includes a first relay conductor having one end connected to the end portion in the cooling water region, a third relay conductor having one end connected to the crossover wiring, and the first and third relay conductors. A second relay conductor connecting the other ends of the relay conductors, and the second relay conductor has a cylindrical portion, and the cylindrical portion is formed on the support plate. Inserted through the formed circular through hole from the inside of the cooling water region to a region outside the cooling water region, and connected to the crossover wiring via the third relay conductor in the region outside the cooling water region. The uniform magnetic field generating electromagnet device according to claim 2, wherein:   The cylindrical portion of the second relay conductor is provided with an O-ring at a position facing the inner peripheral surface of the through hole of the support plate so that cooling water can be sealed. The uniform magnetic field generating electromagnet device according to claim 3.   The electromagnet is such that both the coil winding start and winding end portions are drawn from the upper position in the cooling water region with respect to the central axis of the electromagnet unit and straddle the upper portions of the electromagnet units. The uniform magnetic field generating electromagnet device according to any one of claims 2 to 4, wherein the uniform magnetic field generating electromagnet device is connected to the crossover wiring arranged on the wire.   The said crossover wiring is a flexible twisted copper wire, The uniform magnetic field generation electromagnet apparatus as described in any one of Claims 1-5 characterized by the above-mentioned.   The uniform magnetic field generating electromagnet device according to any one of claims 1 to 6, wherein the coil of the electromagnet is a rectangular conductor.

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