JP2019140189A - Magnetic field generation device - Google Patents

Abstract

To provide a magnetic field generation device capable of exerting a magnetic field far.SOLUTION: A magnetic field generation device 10 includes a plurality of magnetomotive force generation regions 20 having a square cross section and capable of generating a magnetomotive force in a direction along the cross section, and a plurality of conductors 30 provided at least at the corners of each of the magnetomotive force generation regions 20 and arranged to intersect the magnetomotive force generation region 20. The magnetomotive force generation regions 20 are arranged along a predetermined direction with n (n is an integer of 5 or more) as a set and rotating the magnetomotive force by 2π/n [rad].SELECTED DRAWING: Figure 7

Description

  The present invention relates to a magnetic field generating device that generates a magnetic field by a current flowing in a conductive wire.

  An electromagnetic cooker (IH cooker) supplies a high-frequency current to a coil to form a magnetic field, generates an eddy current due to electromagnetic induction in an induction heating device arranged in this magnetic field, and heats the induction heating device. To do. In the induction heating cooker of Patent Document 1, a central coil is arranged, and a plurality of peripheral coils are arranged around the central coil, and a high-frequency current is supplied to the central coil and the plurality of peripheral coils. A magnetic field is formed. Moreover, in patent document 1, the induction heating cooking utensil placed above the central coil and the peripheral coil is detected, and the high frequency current is selectively applied to the central coil and the peripheral coil where the induction heating utensil is detected above. By supplying, generation | occurrence | production of the unnecessary magnetic flux which does not contribute to the heating of the induction heating instrument is suppressed.

International Publication No. 2010/101202

  By the way, in a coil wound in a flat plate shape (flat shape), a magnetic field is generated on one surface side and the other surface side (back surface side) of the flat coil. For this reason, in the electromagnetic cooker, a magnetic shielding member using a ferromagnetic material or the like is arranged on the opposite side (the back side of the apparatus) from the induction heating device of the coil, and the magnetic flux generated toward the back side of the apparatus is generated by the electromagnetic cooker. Leakage into the interior space is suppressed. Moreover, in an electromagnetic cooker, heat is generated in the coil that forms the magnetic field, and heat is also generated in the magnetic shielding member. For this reason, the electromagnetic cooker is provided with cooling means such as a cooling fan and a heat radiating fin to suppress overheating of the coil and the magnetic shielding member.

  On the other hand, attaching a cooling means such as a cooling fan or a heat radiating fin increases the size of the apparatus, leading to an increase in cost. In order to solve these problems, the magnetic field generated by the flat coil group formed in a flat plate shape can be concentrated only on one side of the flat coil group, and the magnetic field generated on the other side of the coil group can be extremely reduced. A magnetic field generator in which the magnetomotive force rotates by 90 degrees has been proposed, but it has been a problem that the magnetic field does not reach far compared with a conventional electromagnetic cooker such as Patent Document 1.

  The present invention has been made in view of the above-described facts, and an object thereof is to provide a magnetic field generator capable of exerting a magnetic field far.

  The magnetic field generator of the first aspect has a square cross section, and is provided at least in a plurality of magnetomotive force generation regions capable of generating a magnetomotive force in a direction along the cross section, and at a corner of each of the magnetomotive force generation regions. A plurality of conducting wires arranged to intersect the magnetomotive force generation region, wherein the magnetomotive force generation region is a set of n (n is an integer of 5 or more), and the magnetomotive force is 2π. It is arranged along a predetermined direction while being rotated by / n [rad].

  A 1st aspect is a magnetic field generator which has arrange | positioned the magnetomotive force generation | occurrence | production area | region with a square cross section along a predetermined direction. In this magnetic field generator, the Halbach array can be configured by rotating the magnetomotive force in the magnetomotive force generation region by 2π / n [rad] in a predetermined direction. Further, in this magnetic field generator, the amount of change in the angle of the magnetomotive force in the magnetomotive force generation region can be changed. Therefore, the magnetic field generated on one side of the magnetomotive force generation region can be exerted farther by reducing the amount of change in the magnetomotive force angle.

  In the magnetic field generator of the second aspect, in the first aspect, when the reference current value is I, the k-th magnetomotive force generation region from the predetermined magnetomotive force generation region is a diagonal corner. Currents obtained by I × (sin (2π × k / n) + cos (2π × k / n)) are supplied to the conductors of one set of the two with the opposite polarities and become diagonal. Currents obtained by I × (sin (2π × k / n) −cos (2π × k / n)) are supplied to the other set of the conductors in the corners with the polarity reversed.

  In the magnetic field generator of the second aspect, a conducting wire is disposed at least at the corner of the magnetomotive force generating region. And the 2nd mode prescribes | regulates the electric current value which should be supplied in a kth magnetomotive force generation area | region when the magnetomotive force generation | occurrence | production area | region where the angle of a magnetomotive force is 0 [rad] is made into the reference position. . Here, “the currents are supplied to the conductors of one (the other) of the corners that are opposite to each other, ... Means that a negative current flows in the other conductor of the opposite corner.

  In the magnetic field generator of the third aspect, when the reference current value is I and the deviation of the magnetomotive force in the predetermined magnetomotive force generation region from the predetermined direction is α [rad], the predetermined magnetomotive force generation region To the kth magnetomotive force generation region, I × (sin (2π × k / n + α) + cos (2π × k / n + α) with respect to one set of the conductors in the diagonal corners. ) Are supplied with the polarities exchanged with each other, and I × (sin (2π × k / n + α) −cos (2π × k / n + α)) are supplied with their polarities reversed.

  In the magnetic field generator of the third aspect, a conducting wire is disposed at least at the corner of the magnetomotive force generating region. And the 3rd mode prescribes | regulates the electric current value which should be supplied in a kth magnetomotive force generation area | region when the magnetomotive force generation | occurrence | production area | region where the angle of a magnetomotive force becomes (alpha) [rad] is made into the reference position. .

  In the magnetic field generator of the 4th mode in the 2nd or 3rd mode, in the magnetomotive force generation field, the above-mentioned conducting wire which makes a pair in at least one of the above-mentioned predetermined direction and the perpendicular direction orthogonal to the above-mentioned predetermined direction, A plurality of sets are provided so as to be symmetric with respect to the diagonal of the corner, and the same current as that of the nearest conductor of the corner is supplied to the conductors on the diagonal.

  In the 4th mode, conducting wire is arranged besides the corner of the magnetomotive force generating region. Each conducting wire is paired in at least one of a predetermined direction and an orthogonal direction. The plurality of conductive wires are arranged so as to be symmetric with respect to the diagonal line of the magnetomotive force generation region. According to the 4th aspect, the intensity | strength of a magnetic field can be increased compared with the case where conducting wire is distribute | arranged only to a corner | angular part.

  In the fourth aspect, the magnetic field generator of the fifth aspect is between the first conductive wire on one of the diagonal lines and the second conductive wire on the diagonal line adjacent to the one diagonal line. An average current of the first conductor and the second conductor is supplied to the sandwiched conductor.

  A 5th aspect prescribes | regulates about the electric current supplied to conducting wires other than the conducting wire on a diagonal.

  In the magnetomotive force generating region of the fourth aspect, the magnetic field generator of the sixth aspect is located on the one corner part side of the predetermined direction center and the one corner part side of the orthogonal direction center. The same current as that of the conductive wire at the one corner is supplied to the conductive wire.

  In the sixth aspect, the current supplied to the conductor group at each corner is defined by regarding the conductors around the corner as an integral body.

  In the magnetic field generator of the seventh aspect, in any one of the first to sixth aspects, each of the conductive wires adjacent to each other across the boundary of the adjacent magnetomotive force generation regions is fused to one fusion conductive wire, The fusion conducting wire is supplied with a current that is the sum of the adjacent conducting wires when the conducting wires adjacent to each other across the boundary are not fused.

  According to the 7th aspect, in addition to the effect of said each aspect, an apparatus can be simplified by reducing the number of conducting wires.

  In any one of the first to seventh aspects, the magnetic field generator of the eighth aspect does not have a hollow portion inside the cross section of the magnetomotive force generation region.

  In the eighth aspect, the conducting wire is arranged without a gap inside the cross section of the magnetomotive force generation region. According to the 8th aspect, the intensity | strength of a magnetic field can be increased compared with the case where it has a hollow part inside a cross section.

  In the magnetic field generation device according to the ninth aspect, in the plurality of magnetomotive force generation regions according to any one of the first to eighth aspects, the conducting wires having the same current value are configured by one litz wire.

  According to the 9th aspect, an apparatus can be simplified by sharing the conducting wire with the same electric current value.

  According to the aspect of the present invention, it is possible to provide a magnetic field generator that can exert a magnetic field far.

It is a schematic block diagram of a magnetic field generator. It is a coil which generates a magnetomotive force, and is a diagram showing an example of generating a magnetomotive force on the (A) + Y side, and a diagram showing an example of generating a magnetomotive force on the (B) + X side. It is a figure which shows the example which is a conducting wire which produces a magnetomotive force, Comprising: (A) + Y side generates a magnetomotive force, (B) + X side produces | generates a magnetomotive force. It is a figure explaining the principle which changes the angle of the magnetomotive force in a magnetic field generation | occurrence | production area | region. It is a simulation result of the magnetic flux density in the Halbach array, and is a diagram when the magnetomotive force is rotated by 90 degrees. It is a simulation result of the magnetic flux density in the Halbach array, and is a diagram when the magnetomotive force is rotated by 45 degrees. It is a schematic sectional drawing of the magnetic field generation part of 1st Embodiment. It is a schematic sectional drawing of the magnetic field generation part of 2nd Embodiment. It is a schematic sectional drawing of the magnetic field generation part of 3rd Embodiment. It is a perspective view (partial cross section figure) which shows the example of arrangement | positioning of the conducting wire in the magnetic field generation part of 3rd Embodiment. It is a perspective view (partial cross section figure) which shows the example of arrangement | positioning of the conducting wire in the magnetic field generation part of 3rd Embodiment. It is a schematic sectional drawing of the magnetomotive force generation area | region of 4th Embodiment. It is a schematic sectional drawing of the magnetomotive force generation area | region of 5th Embodiment. It is a schematic sectional drawing of the magnetomotive force generation area | region of 6th Embodiment, Comprising: It is the example which distribute | arranged the odd number of conducting wires to one side. It is a schematic sectional drawing of the magnetomotive force generation area | region of 6th Embodiment, Comprising: It is the example which distribute | arranged the even number of conducting wire to one side. It is a schematic sectional drawing of the magnetomotive force generation area | region of 7th Embodiment, Comprising: It is the example which distribute | arranged the odd number of conducting wires to one side. It is a figure explaining the electricity supply pattern at the time of generating the magnetomotive force of (A) X direction in the conducting wire pattern of FIG. 16, and generating the magnetomotive force of (B) Y direction. It is a schematic sectional drawing of the magnetomotive force generation area | region of 7th Embodiment, Comprising: It is the example which distribute | arranged the even number of conducting wires to one side. It is a figure explaining the electricity supply pattern at the time of generating (A) the magnetomotive force of the X direction in the conducting wire pattern of FIG. 18, and (B) the magnetomotive force of the Y direction. (A) is a schematic block diagram which shows a Halbach magnet arrangement | sequence, (B) is a schematic block diagram which shows a general magnet arrangement | sequence.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the description of each figure, when a current flows through a conductor crossing the cross section of the magnetomotive force generation region, the current flowing on the + Z side (front side in the figure) is positive (+), -Z side (the back side in the figure). The current flowing through is negative (−).

[Explanation of basic principle]
FIG. 20A shows a Halbach magnet array 100, and FIG. 20B shows a general magnet array 102 as a comparative example. 20A and 20B are development views in which the arrangement of magnets is developed linearly. In the drawing, the S pole side of the magnet is indicated by shading, the magnetization direction (the direction from the S pole to the N pole in the magnet) is indicated by an arrow, and the lines of magnetic force are indicated by a broken line.

  A magnet array 102 shown in FIG. 20B is formed around a rotation axis in an electric rotating machine such as an electric motor (motor) or a generator. In the magnet arrangement 102, a plurality of magnets (permanent magnets) 104 are arranged such that the magnetization directions are alternately directed in opposite directions, and an N pole and an S pole are sequentially arranged on both sides of the direction intersecting the arrangement direction. Has been placed. For this reason, in the magnet arrangement | sequence 102, a magnetic field (magnetic field) is formed in the both sides of the direction which cross | intersects the arrangement direction of the magnet 104. FIG.

  Further, as shown in FIG. 20A, the magnet array includes a Halbach magnet array 100 in which the magnetization direction is changed by approximately 90 degrees (π / 2 [rad]) between adjacent magnets 104. is there. In the Halbach magnet arrangement 100, the magnetization direction of the magnets 104B and 104C on both sides of the arrangement direction is directed to the magnet 104A side with respect to the magnet 104A whose magnetization direction is directed to one side in the direction intersecting the arrangement direction. . In addition, the magnets 104D and 104E adjacent to the magnets 104B and 104C on the opposite side to the magnet 104A have the magnetization direction opposite to the magnetization direction of the magnet 104A. A magnet 104 (a magnet 104 similar to the magnet 104C) whose magnetizing direction is directed to the opposite side of the magnet 104B is disposed on the opposite side of the magnet 104D from the magnet 104B. What is the magnet 104C of the magnet 104E? On the opposite side, a magnet 104 (a magnet 104 similar to the magnet 104B) whose magnetizing direction is directed to the opposite side of the magnet 104C is disposed (all not shown).

  Thereby, in the Halbach magnet array 100, a magnetic field stronger than the magnet array 102 is formed in the magnetization direction of the magnet 104A, and the magnetic field in the direction opposite to the magnetization direction of the magnet 104A is compared with the magnetic field of the magnet array 102. And weakened. The magnet 104 used in such a Halbach magnet array 100 is, for example, substantially rectangular parallelepiped (a square with a side length of a cross section parallel to the magnetization direction), and may be arranged so as to be in close contact with each other. preferable.

  Here, in order to apply the Halbach magnet arrangement to a magnetic field generator such as an electromagnetic cooker (IH cooker), it is necessary to generate an eddy current by electromagnetic induction. That is, in a magnetic field generator having a Halbach magnet array, in order to generate electromagnetic induction, it is necessary to generate an alternating magnetic field by passing an alternating current through a conductive wire (conductive wire).

  FIG. 1 shows a schematic configuration of the magnetic field generator 10. The magnetic field generation device 10 includes a magnetic field generation unit 12 and a power supply unit 14 as a current supply unit. The power supply unit 14 supplies a high frequency current (alternating current) to the magnetic field generation unit 12.

  In general, when a current is passed through a pair of conducting wires (electric wires) or a coil around which the conducting wires are wound, the pair of conducting wires or coils function as an electromagnet, and the electromagnet can form a magnetic field like the magnet 104.

  2A and 2B show an example in which coils 132 and 134 made of a conducting wire 130 are arranged in the magnetomotive force generation region 20 having a square cross section. As shown in FIGS. 2A and 2B, the coils 132 and 134 are solenoids (solenoid coils) formed by winding a conductive wire (electric wire) 130 as a conductive wire in a spiral shape. .

  The coils 132 and 134 have substantially the same diameter (the diameter of the winding portion) and the length of the winding portion along the axial direction (both are distance L). The coils 132 and 134 function as magnets (electromagnets) by generating a magnetic force line (magnetic flux line) penetrating through the hollow interior when a current flows through the conductive wire 130. In addition, the coils 132 and 134 are alternately switched in the direction of the magnetic flux lines when an alternating current such as a high-frequency current is supplied to the conducting wire 130. 2A and 2B, the direction of the magnetomotive force generated in the coils 132 and 134 at a predetermined timing is indicated by an arrow, and the direction of the magnetomotive force of the coils 132 and 134 is determined by the magnet 104. Corresponds to the magnetic direction.

  As shown in FIG. 2A, a magnetomotive force can be generated on the + Y side by arranging the coil 132 with the Y direction as an axis and passing a current in the rotational direction in which the right screw is advanced on the + Y side. In addition, a magnetomotive force can be generated on the -Y side by causing a current to flow in the rotational direction in which the right screw is advanced to the -Y side.

  As shown in FIG. 2B, a magnetomotive force can be generated on the + X side by arranging the coil 134 with the X direction as an axis and passing a current in the rotational direction in which the right screw is advanced to the + X side. In addition, a magnetomotive force can be generated on the −X side by flowing a current in the rotation direction in which the right screw is advanced to the −X side.

  As described above, the magnetomotive force generation region 20 is replaced with the magnet 104 in the Halbach magnet array 100 shown in FIG. 20A by adjusting the direction of the coils 132 and 134 and the direction of the current flowing through the coils 132 and 134. be able to. Then, a magnetic field approximate to the magnetic field of the Halbach magnet array 100 is electrically formed by the power (high-frequency current) supplied from the power supply unit 14. Further, in the magnetic field generation device 10, the power supply unit 14 supplies a high frequency current having a predetermined frequency to the magnetic field generation unit 12, so that the magnetic field generation unit 12 generates a high frequency alternating magnetic field. Thereby, the magnetic field generator 10 can be applied to electromagnetic induction equipment such as an electromagnetic cooker.

  As shown in FIGS. 3A and 3B, in the magnetomotive force generation region 20, a plurality of pairs of conductive wires 30 perpendicular to the magnetomotive force generation region 20 are provided instead of the above-described coils 132 and 134 made of the conductive wire 130. It is arranged. Here, in the magnetomotive force generation region 20, the distance between the sides facing each other in the X direction and the distance between the sides facing each other in the Y direction are both the distance L, and the cross section has a square shape. In FIGS. 3A and 3B, the direction of the magnetomotive force generated in the magnetomotive force generation region 20 at a predetermined timing is indicated by an arrow (hereinafter the same as FIGS. 4 to 19).

  In the magnetomotive force generation region 20, the lead wire 30 has a lead wire 30 </ b> Aa at the −X side + and Y side corner, a lead wire 30 </ b> Ba at the + X side and + Y side corner, and the −X side and −Y side corner. The conducting wire 30Ab is provided with conducting wires 30Bb at corners on the + X side and the −Y side, respectively. Further, in the magnetomotive force generation region 20, the lead wire 30 has a lead wire 30 As at the center of the −X side, a lead wire 30 Bs at the center of the + X side, a lead wire 30 Sa at the center of the + Y side, and the −Y side. Conductive wires 30Sb are provided in the center of each side.

  The conducting wire 30 may be a copper wire or a metal wire other than a copper wire. In addition, a litz wire may be used as the conducting wire 30, and in particular, a litz wire is preferably used when a high-frequency current (current having a frequency of several kHz or more) is supplied from the power supply unit 14. Moreover, although the conducting wire 30 may be a bare wire, in each embodiment described later, a heat-resistant covered wire is used.

  Here, as shown in FIG. 3 (A), the current flowing toward the + Z side to the -X side conducting wire 30Aa, the conducting wire 30As and the conducting wire 30Ab, and the + X side conducting wire 30Ba, the conducting wire 30Bs and the conducting wire 30Bb to the -Z side. A magnetomotive force toward the + Y side can be generated by causing each of the currents to flow. In addition, by passing a current toward the -Z side to the -X side conductor 30Aa, the conductor 30As and the conductor 30Ab, and a current toward the + Z side to the + X side conductor 30Ba, the conductor 30Bs and the conductor 30Bb, respectively, to the -Y side A magnetomotive force can be generated. Note that when magnetomotive force is generated in the Y direction, no current flows through the conducting wire 30Sa and the conducting wire 30Sb provided at both ends at the center in the X direction.

  On the other hand, as shown in FIG. 3B, a current directed to the -Z side to the + Y side conducting wire 30Aa, the conducting wire 30Sa, and the conducting wire 30Ba is directed to the -Y side conducting wire 30Ab, a conducting wire 30Sb, and the conducting wire 30Bb to the + Z side. By causing each current to flow, a magnetomotive force toward the -X side can be generated. Further, a current flowing toward the + Z side is supplied to the + Y side conducting wire 30Aa, the conducting wire 30Sa, and the conducting wire 30Ba, and a current flowing toward the −Z side is supplied to the −Y side conducting wire 30Ab, the conducting wire 30Sb, and the conducting wire 30Bb, respectively. Magnetomotive force can be generated. When magnetomotive force is generated in the X direction, no current flows through the conducting wire 30As and the conducting wire 30Bs provided at both ends at the center in the Y direction.

  As described above, it is possible to replace the coils 132 and 134 shown in FIGS. 2A and 2B by adjusting the arrangement of the conductive wires 30 and the direction of the current. A magnetic field approximate to the magnetic field of the Halbach magnet array 100 can be electrically formed by the power (high-frequency current) supplied from the power supply unit 14. Further, in the magnetic field generation device 10, the power supply unit 14 supplies a high frequency current having a predetermined frequency to the magnetic field generation unit 12, so that the magnetic field generation unit 12 generates a high frequency alternating magnetic field. Thereby, the magnetic field generator 10 can be applied to electromagnetic induction equipment such as an electromagnetic cooker.

  Next, a method of generating an oblique magnetomotive force in the magnetomotive force generation region 20 will be described. If the gradient of the magnetomotive force with respect to the X axis (+ X side) is θ [rad], for example, as shown in FIG. 4, the magnetomotive force on the + X side (θ = 0) and the + Y side (θ = π / 2) The magnetomotive force of 45 degrees (θ = π / 4) can be generated by synthesizing with the magnetomotive force. Here, assuming that the magnitude of the magnetomotive force when the magnetomotive force is 0 degree (θ = 0) in the magnetomotive force generation region 20 is Vm, the magnetomotive force having the magnitude Vm is obtained when the magnetomotive force is oriented in the θ direction. In order to generate the magnetomotive force, it is necessary to generate a magnetomotive force having a size Vm × cos θ in the X direction and a size Vm × sin θ in the Y direction.

  Here, in order to generate a magnetomotive force having a magnitude of Vm when facing the + X side (θ = 0), when the current passed through each conductor 30 is I, that is, the current for each of the conductors 30Aa, 30Sa, and 30Ba. I and the conducting wires 30Ab, 30Sb, and 30Bb, when the current −I is supplied, the magnetomotive force Vm is proportional to the current I. Therefore, in order to generate a magnetomotive force having a magnitude Vm in the θ direction, a current of I × cos θ is caused to flow through the conducting wires 30Aa, 30Sa, and 30Ba that generate a magnetomotive force in the X direction, respectively, thereby conducting the conducting wires 30Ab, 30Sb, and 30Bb. It is necessary to pass a current of −I × cos θ. Further, it is necessary to pass a current of I × sin θ through the conducting wires 30Aa, 30As, and 30Ab that generate magnetomotive force in the Y direction, and a current of −I × sin θ through the conducting wires 30Ba, 30Bs, and 30Bb.

  And since the conducting wire 30 which comprises the corner | angular part of the magnetomotive force generation area | region 20 is concerned with both magnetomotive forces of a X direction and a Y direction, about the electric current which flows into the conducting wire 30 of these corner | angular parts, it is the electric current of each component. The sum of That is, a current of I × (cos θ + sin θ) flows through the conducting wire 30Aa, a current of I × (cos θ−sin θ) flows through the conducting wire 30Ba, and a current of I × (−cos θ + sin θ) flows through the conducting wire 30Ab. Causes a current of −I × (cos θ + sin θ) to flow (see FIG. 4).

  Next, the relationship between the magnetomotive force rotation angle and the magnetic field when the magnetomotive force generation regions 20 are arranged side by side will be described. FIG. 5 and FIG. 6 show the magnetic flux density distribution when the magnetomotive force generating regions 20 having the arrangement of the conductive wires 30 shown in FIG. 4 are arranged along the X direction and a magnetic field is generated so as to form a Halbach array. The Halbach array by the conducting wires 30 is configured by arranging magnetomotive forces generated along a square cross section while rotating them at a predetermined rotation angle. When the number of magnetomotive forces per unit in the Halbach array is n, the rotation angle is 360 / n degrees (2π / n [rad]) by a predetermined rotation angle.

  For example, FIG. 5 shows an example in which the magnetomotive force in the magnetomotive force generation region 20 is arranged while being rotated by 90 degrees (n = 4), and FIG. 6 is an example in which the magnetomotive force is arranged while being rotated by 45 degrees (n = 8). It is. For example, if the length of a piece of a square cross section constituting the magnetomotive force generation region 20 is lm and the pole pitch (distance between N poles and S poles) is τ, for example, the magnetomotive force is + Y side (θ = π / 2). The magnetic flux density at the point P at the distance τ immediately above the point O on the + Y side of the magnetomotive force generation region 20 facing the direction of γ is the same when the rotation angle is 90 degrees and 45 degrees. Since the rotation angle of the magnetomotive force is determined by dividing 360 degrees by the integer n, the pole pitch τ can be expressed as lm × n / 2. For this reason, when the length lm of the piece of the square cross section is fixed, it is understood that the rotation angle should be reduced in order to increase the magnetic flux density in the space farther from the arrangement surface in the Halbach array. That is, the number n of magnetomotive forces per unit in the Halbach array may be increased.

  As described above, in the present invention, as shown in FIG. 4, the direction of the magnetomotive force can be freely changed by providing a plurality of pairs of conducting wires 30 in the direction intersecting the cross section constituting the magnetomotive force generation region 20. It is. Thus, it is possible to provide a magnetic field generator that can increase the magnetic flux density in a farther space, that is, the magnetic field can extend far.

[First Embodiment]
As shown in FIG. 7, the magnetic field generator 10 of the first embodiment arranges a plurality of magnetomotive force generation regions 20 side by side in the X direction, which is a predetermined direction, and magnetomotive force of adjacent magnetomotive force generation regions 20. Has a magnetic field generator 12A in which the rotation angle is changed by 60 degrees (θ = π / 3). That is, n = 6, where n is the number of magnetomotive forces per unit in the Halbach array.

  In the present embodiment, the magnetomotive force generation region 20 is a region 21 where a magnetomotive force is generated in the direction of 0 degrees (θ = 0), and a region 22 where the magnetomotive force is generated in a direction of 60 degrees (θ = π / 3), 120 degrees ( A region 23 in which a magnetomotive force is generated in the direction of θ = 2π / 3) is provided. In the present embodiment, the magnetomotive force generation region 20 is a region 24 in which magnetomotive force is generated in the direction of 180 degrees (θ = π), and regions 25 and 300 in which magnetomotive force is generated in the direction of 240 degrees (θ = 4π / 3). A region 26 in which magnetomotive force is generated in the direction of degrees (θ = 5π / 3) is provided. The regions 21 to 26 are arranged along the X direction and constitute a Halbach array. In the region 26, the region 21 is disposed again on the side opposite to the region 25.

  In this embodiment, eight conductive wires 30 are arranged in the Z direction, which is the crossing direction of the cross section constituting the magnetomotive force generation region 20, to generate a magnetomotive force. Specifically, the lead wire 30 has a lead wire 30Aa provided at a corner portion on the −X side and the + Y side, a lead wire 30Ba provided at a corner portion on the + X side and the + Y side, and a corner portion on the −X side and the −Y side. Conductive wire 30Ab provided and conductive wire 30Bb provided at the corners on the + X side and the -Y side (see FIGS. 3A and 3B).

  Further, the conductive wire 30 includes a conductive wire 30Sa provided at the center of the side on the + Y side, a conductive wire 30Sb provided at the center of the side on the −Y side, a conductive wire 30As provided at the center of the side on the −X side, and + X. And a conductive wire 30Bs provided at the center of the side portion (see FIGS. 3A and 3B).

  In addition, in each magnetomotive force generation area | region 20, when conducting wire 30Aa, 30Ba, 30Ab, 30Bb, 30Sa, 30Sb, 30As, 30Bs is specified, it shall attach | subject the code | symbol as follows. For example, in the area | region 21, it is set as conducting wire 31Aa, 31Ba, 31Ab, 31Bb, 31Sa, 31Sb, 31As, 31Bs. Further, for example, in the region 22, the conductive wires are 32Aa, 32Ba, 32Ab, 32Bb, 32Sa, 32Sb, 32As, and 32Bs. The same applies to the regions 23 to 26.

  In the magnetic field generation unit of the present embodiment, when the reference current is I and the region 21 where the magnetomotive force is 0 degrees (θ = 0) is the reference position, the kth magnetomotive force generation region from the region 21 to the + X side. The current flowing through each of the 20 conductive wires 30 is as follows.

  That is, at the corner, a current obtained by I × (cos (π × k / 3) + sin (π × k / 3)) flows through the conductive wire 30Aa, and I × (cos (π × k) flows through the conductive wire 30Ba. / 3) -sin (π × k / 3)) flows, and the conductor 30Ab has a current determined by I × (−cos (π × k / 3) + sin (π × k / 3)). The electric current calculated | required by -I * (cos ((pi) * k / 3) + sin ((pi) * k / 3)) flows into the conducting wire 30Bb.

  In the side portion, a current obtained by I × cos (π × k / 3) flows through the conducting wire 30Sa, and a current obtained by −I × cos (π × k / 3) flows through the conducting wire 30Sb. A current obtained by I × sin (π × k / 3) flows through 30 As, and a current obtained by −I × sin (π × k / 3) flows through the conductive wire 30 Bs.

  As described above, according to the present embodiment, the angle of the magnetomotive force can be freely adjusted in the magnetomotive force generation region 20. A plurality of magnetomotive force generation regions 20 are arranged side by side along the X direction, and the rotation angle of the magnetomotive force of the adjacent magnetomotive force generation regions 20 is changed by a predetermined angle, whereby the magnetic field generation unit 12A having a Halbach array. Can be configured. When the magnetomotive force angle changes counterclockwise as the magnetomotive force generation region 20 moves toward the + X side as in the present embodiment, the magnetic field is suppressed on the −Y side of the magnetomotive force generation region 20 and on the + Y side. A magnetic field can be generated widely.

  According to the configuration of the magnetic field generator 12A of the present embodiment, a magnetic field can be generated on the + Y side by reducing the amount of change in the magnetomotive force rotation angle. That is, the magnetic flux density in a distant space can be increased. In this embodiment, the number of magnetomotive forces per unit in the Halbach array is set to 6 (n = 6) so that the magnetomotive force changes by 60 degrees (θ = π / 3). In contrast to the Halbach array (see FIG. 5) having an angle of 90 degrees, the number of magnetomotive forces per unit in the Halbach array is preferably 5 (n = 5) or more.

  In this case, when the reference current is I, the number of magnetomotive forces per unit in the Halbach array is n, and the magnetomotive force generation region 20 where the magnetomotive force is 0 degrees (θ = 0) is the reference position, the reference position is The current flowing through each conductor 30 of the kth magnetomotive force generation region 20 on the + X side is as follows.

  That is, at the corner, a current obtained by I × (cos (2π × k / n) + sin (2π × k / n)) flows through the conductor 30Aa, and I × (cos (2π × k) through the conductor 30Ba. / N) −sin (2π × k / n)) flows, and the current obtained by I × (−cos (2π × k / n) + sin (2π × k / n)) flows through the conductor 30Ab. The electric current calculated | required by -I * (cos (2 (pi) * k / n) + sin (2 (pi) * k / n)) flows into conducting wire 30Bb.

  In the side portion, a current obtained by I × cos (2π × k / n) flows through the conducting wire 30Sa, and a current obtained by −I × cos (2π × k / n) flows through the conducting wire 30Sb. A current obtained by I × sin (2π × k / n) flows through 30 As, and a current obtained by −I × sin (2π × k / n) flows through the conductive wire 30 Bs.

  In the present embodiment, only the rotation angle is adjusted with the reference current value being I, in other words, the point away from the magnetomotive force generation region 20 to the + Y side by adjusting the amount of change in the rotation angle of the magnetomotive force. The magnetic flux density at can be increased or decreased. That is, when the magnetic field generator 10 of this embodiment is applied to a cooking utensil, it can be adjusted so that the eddy current becomes maximum according to the distance from the top plate of the cooking utensil to the cooking utensil (eg, pan bottom).

  In the present embodiment, in the region 21 where the magnetomotive force is 0 degree (θ = 0), the currents of the conducting wire 31As and the conducting wire 31Bs are zero. In the region 24 where the magnetomotive force is 180 degrees (θ = π), the currents of the conducting wire 34As and the conducting wire 34Bs are zero. That is, when the rotation angle of the magnetomotive force is not changed, these conducting wires 31As, 31Bs, 34As, and 34Bs can be omitted.

(Modification)
In the magnetic field generator 12A of the first embodiment, the region 21 where the magnetomotive force is 0 degrees (θ = 0) is set as the reference position, but this is not restrictive. For example, when the magnetomotive force generation region 20 in which the magnetomotive force is α [rad] (α × 180 / π degrees) is set as the reference position, the reference current is I, and the number of magnetomotive forces per unit in the Halbach array is Assuming n, the current flowing through each conductor 30 of the kth magnetomotive force generation region 20 on the + X side is as follows.

  That is, at the corner, a current obtained by I × (cos (2π × k / n + α) + sin (2π × k / n + α)) flows through the conductive wire 30Aa, and I × (cos (2π × k) flows through the conductive wire 30Ba. / N + α) −sin (2π × k / n + α)) flows, and the conductor 30Ab has a current determined by I × (−cos (2π × k / n + α) + sin (2π × k / n + α)). The electric current calculated | required by -I * (cos (2 (pi) * k / n + (alpha)) + sin (2 (pi) * k / n + (alpha))) flows into conducting wire 30Bb.

  In the side portion, a current obtained by I × cos (2π × k / n + α) flows through the conducting wire 30Sa, and a current obtained by −I × cos (2π × k / n + α) flows through the conducting wire 30Sb. A current obtained by I × sin (2π × k / n + α) flows through 30 As, and a current obtained by −I × sin (2π × k / n + α) flows through the conductive wire 30 Bs.

[Second Embodiment]
In the magnetic field generator 12A of the first embodiment, the conducting wires 30 are arranged at the corners and sides of the magnetomotive force generation region 20, but the magnetic field generator 12B of the second embodiment is shown in FIG. As shown in the figure, conductive wires are arranged only at the corners of the magnetomotive force generation region 20. In the second embodiment, the same functional parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted.

  The rotation angle of the magnetomotive force in the magnetomotive force generation region 20 of the present embodiment is the same as that of the first embodiment. That is, the region 21 to the region 26 are arranged along the X direction to form a Halbach array.

  In the present embodiment, the conducting wire 30 includes a conducting wire 30Aa provided at a corner on the −X side and the + Y side, a conducting wire 30Ba provided on a corner on the + X side and the + Y side, and a corner on the −X side and the −Y side. A conductive wire 30Ab provided at the corner, and a conductive wire 30Bb provided at the corner on the + X side and the −Y side.

  In addition, when specifying conducting wire 30Aa, 30Ba, 30Ab, 30Bb in each magnetomotive force generation | occurrence | production area | region 20, suppose that a code | symbol is attached | subjected as follows. For example, in the region 21, the conductive wires 31Aa, 31Ba, 31Ab, and 31Bb are used. Further, for example, in the region 22, the conducting wires are 32Aa, 32Ba, 32Ab, and 32Bb. The same applies to the regions 23 to 26.

  In the magnetic field generation unit of the present embodiment, when the reference current is I, the current flowing through each conductive wire 30 is as follows. That is, a current obtained by I × (cos (π × k / 3) + sin (π × k / 3)) flows through the conductor 30Aa, and I × (cos (π × k / 3) −sin through the conductor 30Ba. (Π × k / 3)) flows, and the conductor 30Ab flows with the current calculated by I × (−cos (π × k / 3) + sin (π × k / 3)), and the conductor 30Bb Current flowing through −I × (cos (π × k / 3) + sin (π × k / 3)) flows.

  The magnetic field generator 12B of the second embodiment configured as described above also has the same operational effects as the first embodiment.

[Third Embodiment]
In the magnetic field generator 12A of the first embodiment, the conducting wires 30 are arranged at the corners and sides of the magnetomotive force generating region 20, but the magnetic field generator 12C of the third embodiment is shown in FIG. As shown, adjacent conductors 30 at the boundary between adjacent magnetomotive force generation regions 20 are fused together as a fusion conductor 300. In the third embodiment, the same functional parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted.

  The rotation angle of the magnetomotive force in the magnetomotive force generation region 20 of the present embodiment is the same as that of the first embodiment. That is, the region 21 to the region 26 are arranged along the X direction to form a Halbach array.

  Looking at the region 22, the lead wire 30 is a corner of the fusion lead wire 312 a provided at the −X side and + Y side corner which is the boundary portion with the region 21, and the + X side and + Y side corner which is the boundary portion with the region 23. The fusion conductor 323a provided at the portion, the fusion conductor 312b provided at the corner on the −X side and −Y side that is the boundary between the region 21 and the + X side and −Y that is the boundary between the region 23 And a fusion conducting wire 323b provided at the corner portion on the side.

  Further, the conductive wire 30 in the region 22 is a side on the −X side that is a boundary portion between the conductive wire 32Sa provided in the center of the side on the + Y side, the conductive wire 32Sb provided in the center on the −Y side, and the region 21. A fusion conducting wire 312 s provided at the center of the part and a fusion conducting wire 323 s provided at the center of the side on the + X side which is a boundary part with the region 23.

  In addition, when specifying the conducting wire 30 in each magnetomotive force generation area | region 20, suppose that a code | symbol is attached | subjected as follows. For example, the fusion conducting wire 300 at the boundary between the region 26 and the region 21 is assumed to be the fusion conducting wires 361a, 361s, and 361b from the + Y side. For example, the fusion conducting wire 300 at the boundary between the region 23 and the region 24 is assumed to be the fusion conducting wires 334a, 334s, and 334b from the + Y side. The same applies to the boundary with other regions.

  Further, for example, the conductors 30 at the center of the side on the + Y side and −Y side of the region 21 are the conductors 31Sa and 31Sb, respectively, and the conductors 30 at the center of the side on the + Y side and −Y side of the region 23 are the conductors 33Sa, respectively. 33Sb. The same applies to the regions 24 to 26.

  Here, the combined current 300 of the present embodiment is supplied with the sum of currents of the adjacent conductors 30 when the adjacent conductors 30 are not fused across the boundary (see FIG. 7). That is, assuming that the reference current is I and the region 21 where the magnetomotive force is 0 degrees (θ = 0) is the reference position, the kth magnetomotive force generation region 20 and the k + 1th magnetomotive force from the region 21 to the + X side. The current flowing in the fusion conducting wire 300 at the boundary with the generation region 20 is as follows.

  The fusion conducting wire 300 at the corner on the + Y side has I × (cos (π × k / 3) −sin (π × k / 3) + cos (π × (k + 1) / 3) + sin (π × (k The current required in +1) / 3)) flows.

  Further, the fusion conducting wire 300 at the corner on the −Y side has I × (−cos (π × k / 3) −sin (π × k / 3) −cos (π × (k + 1) / 3) + sin. The current obtained by (π × (k + 1) / 3)) flows.

  Furthermore, a current obtained by I × (−sin (π × k / 3) + sin (π × (k + 1) / 3)) flows through the fusion conducting wire 300 at the central portion in the Y direction.

  Note that a current obtained by I × cos (π × k / 3) flows through the conductor 30Sa in the kth magnetomotive force generation region 20 from the region 21 to the + X side, and −I × cos (π × k) through the conductor 30Sb. / 3) The electric current calculated | required flows.

  By the way, in this embodiment, when the direction of the magnetomotive force becomes symmetrical between the adjacent magnetomotive force generation regions 20, the fusion conducting wire 300 at the boundary portion between the adjacent magnetomotive force generation regions 20 can be omitted. That is, in this embodiment, the fusion conducting wires 323a, 323s, and 323b, which are the fusion conducting wires 300 at the boundary between the region 22 and the region 23, can be omitted. Moreover, the fusion conducting wires 356a, 356s, and 356b, which are the fusion conducting wires 300 at the boundary between the region 25 and the region 26, can be omitted.

  10 and 11 are perspective views of the magnetic field generator 12C of the present embodiment, showing a cross-sectional state when a part is cut away. As shown in FIG. 10, it can be formed by a coil group formed of litz wires arranged in an annular shape. Moreover, as shown in FIG. 11, it can be formed by a coil group arranged in a short shape. The device can be simplified by sharing the conductors having the same current value. In FIG. 10 and FIG. 11, the litz wire where the supplied current is 0 is omitted.

  In the present embodiment, the number of magnetomotive forces per unit in the Halbach array is 6 (n = 6), but is not limited thereto. In the configuration of the magnetic field generator 12C of the present embodiment, when the number of magnetomotive forces per unit in the Halbach array is n, the reference current is I, and the region 21 where the magnetomotive force is 0 degrees (θ = 0). Is a reference position, the current supplied to the conducting wire 30 is as follows.

  First, the current flowing through the fusion conducting wire 300 at the boundary between the kth magnetomotive force generation region 20 and the (k + 1) th magnetomotive force generation region 20 from the region 21 to the + X side is as follows.

  The fusion conducting wire 300 at the corner on the + Y side has I × (cos (2π × k / n) −sin (2π × k / n) + cos (2π × (k + 1) / n) + sin (2π × (k The current obtained in +1) / n)) flows.

  Further, the fusion conducting wire 300 at the corner on the −Y side has I × (−cos (2π × k / n) −sin (2π × k / n) −cos (2π × (k + 1) / n) + sin. A current obtained by (2π × (k + 1) / n)) flows.

  Furthermore, a current obtained by I × (−sin (2π × k / n) + sin (2π × (k + 1) / n)) flows through the fusion conducting wire 300 at the central portion in the Y direction.

  A current obtained from I × cos (2π × k / n) flows through the conductor 30Sa in the k-th magnetomotive force generation region 20 from the region 21 to the + X side, and −I × cos (2π × k) through the conductor 30Sb. / N) flows the current required.

  The magnetic field generation unit 12C of the third embodiment configured as described above also has the same operational effects as the first embodiment. And according to this embodiment, the number of the conducting wires 30 arrange | positioned in the magnetomotive force generation area | region 20 can be reduced.

  According to the configuration of the magnetic field generation unit 12C of the present embodiment, the Halbach array has symmetry when the number n of magnetomotive forces per unit in the Halbach array is an even number. Therefore, as shown in FIG. 11, the magnetic field generation unit 12 </ b> C can be formed by folding a litz wire bundle. In the case of FIG. 11, the conductor 33Sa and the conductor 32Sa, the conductor 33Sb and the conductor 32Sb, the conductor 34Sa and the conductor 31Sa, the conductor 34Sb and the conductor 31Sb, the conductor 35Sa and the conductor 36Sa, the conductor 35Sb and the conductor 36Sb, respectively. Can be summarized. Further, the fusion conducting wire 334a and the fusion conducting wire 312a, the fusion conducting wire 334s and the fusion conducting wire 312s, and the fusion conducting wire 334b and the fusion conducting wire 312b can be combined into one. Further, the fusion conducting wire 345a and the fusion conducting wire 361a, the fusion conducting wire 345s and the fusion conducting wire 361s, and the fusion conducting wire 345b and the fusion conducting wire 361b can be combined into one.

[Fourth Embodiment]
The magnetic field generator 12D of the fourth embodiment is different from the conductors 30 of the magnetic field generator 12A of the first embodiment in the arrangement of the conductors 40 in the magnetomotive force generation region 20. As shown in FIG. 12, in the present embodiment, a Halbach array can be configured by arranging a plurality of magnetomotive force generation regions 20 along the X direction. And in this embodiment, while arrange | positioning the conducting wire 40 at each corner | angular part of the magnetomotive force generation area | region 20, the 5 conducting wires 40 are arranged along the side part. That is, in the present embodiment, 24 conductors 40 are arranged so as to intersect the cross section constituting the magnetomotive force generation region 20 and surround the magnetomotive force generation region 20.

  Specifically, the conductive wire 40 has a conductive wire 40Aa provided at the corner on the −X side and the + Y side, a conductive wire 40Ba provided at the corner on the + X side and the + Y side, and a corner on the −X side and the −Y side. Conductive wire 40Ab provided and conductive wire 40Bb provided at the corners on the + X side and the −Y side.

  The conductive wire 40 includes five conductive wires 40Sa provided on the + Y side, five conductive wires 40Sb provided on the −Y side, and five provided on the −X side. Lead wire 40As and five lead wires 40Bs provided on the side on the + X side.

  In the present embodiment, when the reference current is I, the number of magnetomotive forces per unit in the Halbach array is n, and the magnetomotive force generation region 20 where the magnetomotive force is 0 degrees (θ = 0) is the reference position. The currents flowing in the respective conductive wires 40 of the kth magnetomotive force generation region 20 on the + X side from the reference position are as follows.

  That is, at the corner, a current obtained by I × (cos (2π × k / n) + sin (2π × k / n)) flows through the conductor 40Aa, and I × (cos (2π × k) through the conductor 40Ba. / N) −sin (2π × k / n)) flows, and the current obtained by I × (−cos (2π × k / n) + sin (2π × k / n)) flows through the conductor 40Ab. The electric current calculated | required by -I * (cos (2 (pi) * k / n) + sin (2 (pi) * k / n)) flows into conducting wire 40Bb.

  In the side portion, a current obtained by I × cos (2π × k / n) flows through the conductor 40Sa, and a current obtained by −I × cos (2π × k / n) flows through the conductor 40Sb. A current obtained by I × sin (2π × k / n) flows through 40 As, and a current obtained by −I × sin (2π × k / n) flows through the conductive wire 40 Bs.

  According to the magnetic field generator 12D of the present embodiment, the number of the conductive wires 40 that generate the magnetomotive force is larger than that of the conductive wire 30 of the first embodiment, and therefore a larger magnetomotive force than that of the first embodiment is generated. Can do.

[Fifth Embodiment]
In the magnetic field generator 12D of the fourth embodiment, the conductive wires 40 are arranged at the corners and sides of the magnetomotive force generating region 20, but the magnetic field generator 12E of the fifth embodiment is shown in FIG. As described above, adjacent conductors 40 at the boundary portion between adjacent magnetomotive force generation regions 20 are fused together as a fusion conductor 400. Note that in the fifth embodiment, functional components similar to those in the fourth embodiment are denoted by the same reference numerals as in the fourth embodiment, and detailed description thereof is omitted.

  In this embodiment, when the magnetomotive force generation region 20 in which the magnetomotive force is 0 degree (θ = 0) is set as the reference position, the kth magnetomotive force generation region 20 and the (k + 1) th magnetomotive force generation from the reference position to the + X side. The next fusion conducting wire 400 is provided at the boundary with the region 20.

  That is, as the conductive wire 40 in the kth magnetomotive force generation region 20, the fusion conductive wire 40Ua provided at the corner on the −X side and the + Y side that is a boundary with the k−1th magnetomotive force generation region 20, and k + 1 The fusion conductor 40Va provided at the corner of the + X side and the + Y side that is the boundary with the th magnetomotive force generation region 20, and the −X side that is the boundary between the k−1th magnetomotive force generation region 20 and A fusion conducting wire 40Ub provided at a corner on the −Y side, and a fusion conducting wire 40Vb provided at a corner on the + X side and the −Y side that is a boundary between the k + 1-th magnetomotive force generation region 20; ing.

  Further, the conductor 40 in the k-th magnetomotive force generation region 20 includes five conductors 40Sa provided on the + Y side, five conductors 40Sb provided on the −Y side, and k−1. + X side side part which is a boundary part between five fusion conducting wires 40Us provided on the side part on the −X side which is the boundary part with the 20th magnetomotive force generation area 20 and the k + 1th magnetomotive force generation area 20 And 5 fusion conductors 40Vs provided in the.

  In the present embodiment, when the reference current is I, the number of magnetomotive forces per unit in the Halbach array is n, and the magnetomotive force generation region 20 where the magnetomotive force is 0 degrees (θ = 0) is the reference position. The current flowing through the fusion conducting wire 400 at the boundary between the k-th magnetomotive force generation region 20 and the (k + 1) -th magnetomotive force generation region 20 on the + X side from the reference position is as follows.

  The fusion conductor 400 (40Va) at the corner on the + Y side has I × (cos (2π × k / n) −sin (2π × k / n) + cos (2π × (k + 1) / n) + sin (2π X (k + 1) / n)).

  Further, the fusion conducting wire 400 (40 Vb) at the corner on the −Y side has I × (−cos (2π × k / n) −sin (2π × k / n) −cos (2π × (k + 1) / n) + sin (2π × (k + 1) / n)) flows.

  Furthermore, each of the five fused conductors 400 (40 Vs) in the Y-direction side has a current obtained by I × (−sin (2π × k / n) + sin (2π × (k + 1) / n)). Flowing.

  Note that a current obtained by I × cos (2π × k / n) flows through the conductor 40Sa in the k-th magnetomotive force generation region 20 on the + X side from the reference position, and −I × cos (2π × k) through the conductor 40Sb. / N) flows the current required.

  The magnetic field generation unit 12E of the fifth embodiment configured as described above also has the same operational effects as the fourth embodiment. And according to this embodiment, the number of the conducting wires 40 arrange | positioned in the magnetomotive force generation area | region 20 can be reduced.

[Sixth Embodiment]
The magnetic field generator 12F of the sixth embodiment is different from the conductors 30 of the magnetic field generator 12A of the first embodiment in the arrangement of the conductors 50 in the magnetomotive force generating region 20. As shown in FIG. 14 and FIG. 15, in the present embodiment, the conductor 50 is arranged at each corner and side of the magnetomotive force generation region 20, and a plurality of conductors 50 are also provided inside the cross section of the magnetomotive force generation region 20. Are arranged side by side.

  Specifically, the lead wire 50 has a lead wire 50Aa provided at a corner portion on the −X side and the + Y side, a lead wire 50Ba provided at a corner portion on the + X side and the + Y side, and a corner portion on the −X side and the −Y side. Conductive wire 50Ab provided and conductive wire 50Bb provided at the corners on the + X side and the −Y side.

  The conductor 50 is disposed on a diagonal line connecting the corners of the magnetomotive force generation region 20, and includes a plurality of conductors 50c1 that are closest to the corner conductor 50Aa and a plurality of conductors 50c2 that are closest to the corner conductor 50Ba. , A plurality of conductors 50c3 that are closest to the corner conductor 50Ab, and a plurality of conductors 50c4 that are closest to the corner conductor 50Bb.

  Furthermore, in this embodiment, the conducting wire 50 is arrange | positioned in the place pinched | interposed into the diagonal line which connects a corner | angular part. That is, the conducting wire 50 includes a plurality of conducting wires 50Sa arranged between the conducting wires 50Aa and 50c1 and the conducting wires 50Ba and 50c2, and a plurality of conducting wires 50Ab and 50c3, and a plurality of conducting wires 50Bb and 50c4. Conductor 50Sb, a plurality of conductors 50As disposed between conductor 50Aa and conductor 50c1, conductor 50Ab and conductor 50c3, and a plurality of conductors 50Bs disposed between conductor 50Ba and conductor 50c2, conductor 50Bb and conductor 50c4. And have.

  In the present embodiment, the conductive wires 50 provided in the magnetomotive force generation region 20 are arranged in odd numbers in the X direction and Y direction (see FIG. 14) and in even numbers in the X direction and Y direction (see FIG. 15). it can. However, the conducting wire 50 needs to be paired in at least one of the X direction and the Y direction. Therefore, as shown in FIG. 14, when an odd number is arranged in the X direction and the Y direction, the conducting wire 50 is not arranged in the central portion of the magnetomotive force generation region 20.

  In the present embodiment, when the reference current is I, the number of magnetomotive forces per unit in the Halbach array is n, and the magnetomotive force generation region 20 where the magnetomotive force is 0 degrees (θ = 0) is the reference position. The currents flowing in the respective conductive wires 40 of the kth magnetomotive force generation region 20 on the + X side from the reference position are as follows.

  That is, at the corner, a current obtained by I × (cos (2π × k / n) + sin (2π × k / n)) flows through the conductor 50Aa, and I × (cos (2π × k) through the conductor 50Ba. / N) −sin (2π × k / n)) flows, and the electric current obtained by I × (−cos (2π × k / n) + sin (2π × k / n)) flows through the conductor 50Ab. The electric current calculated | required by -I * (cos (2 (pi) * k / n) + sin (2 (pi) * k / n)) flows into conducting wire 50Bb.

  Further, at a location sandwiched between diagonal lines, a current obtained by I × cos (2π × k / n) flows through the conductor 50Sa, and a current obtained by −I × cos (2π × k / n) flows through the conductor 50Sb. The electric current calculated | required by I * sin (2 (pi) * k / n) flows into the conducting wire 50As, and the electric current calculated | required by -I * sin (2 (pi) * k / n) flows into the conducting wire 50Bs.

  According to the magnetic field generator 12F of the present embodiment, the number of the conductive wires 50 that generate magnetomotive force is larger than the number of the conductive wires 30 of the first embodiment and the conductive wires 40 of the third embodiment. A magnetomotive force larger than that of the third embodiment can be generated. In particular, in this embodiment, the distortion of the magnetic field in the vicinity of the surface of the magnetomotive force generation region 20 (side on the + Y side) is reduced as compared with the other embodiments. Similar to the fourth embodiment, adjacent conductors 50 may be fused across the magnetomotive force generation region 20 at the boundary between the adjacent magnetomotive force generation regions 20.

[Seventh Embodiment]
The magnetic field generator 12G of the seventh embodiment has the same arrangement of the conductors 60 in the magnetomotive force generation region 20 as that of the conductors 50 of the sixth embodiment, but is different from the magnetic field generator 12F of the sixth embodiment in current. The supply method is different.

  As shown in FIGS. 16 and 18, the conducting wire 60 of this embodiment includes a plurality of conducting wires 60 </ b> Aa provided on the −X side from the X direction center and on the + Y side from the Y direction center, and on the + X side and Y from the X direction center. A plurality of conductors 60Ba provided on the + Y side from the center in the direction, a plurality of conductors 60Ab provided on the −X side from the center in the X direction and on the −Y side from the center in the Y direction, and the center in the + X side and the Y direction from the center in the X direction. And a plurality of conductive wires 60Bb provided on the -Y side.

  Here, in the present embodiment, the conductive wires 60 provided in the magnetomotive force generating region 20 are arranged in odd numbers in the X direction and Y direction (see FIG. 16) and in even numbers in the X direction and Y direction (see FIG. 18). be able to. However, the conducting wire 60 needs to be paired in at least one of the X direction and the Y direction. Therefore, as shown in FIG. 16, when odd numbers are arranged in the X direction and the Y direction, the conducting wire 60 is not arranged in the central portion of the magnetomotive force generation region 20.

  When odd-numbered conductors 60 are arranged in the X and Y directions, the conductors 60 are arranged in the center of the X direction and do not form a pair in the X direction, and are arranged in the center of the Y direction and form a pair in the Y direction. There will be a conductive wire 60 that is not. That is, as shown in FIG. 16, the conducting wire 60 includes a plurality of conducting wires 60Da disposed between the conducting wires 60Aa and 60Ba, a plurality of conducting wires 60Db disposed between the conducting wires 60Ab and 60Bb, There are a plurality of conductors 60Ad disposed between the conductors 60Aa and 60Ab, and a plurality of conductors 60Bd disposed between the conductors 60Ba and 60Bb.

  Here, in this embodiment, when the odd number of conductors 60 are arranged in the X direction and the Y direction, the bundle of the conductor 60Aa, the conductor 60Da and the conductor 60Ba and the bundle of the conductor 60Ab, the conductor 60Db and the conductor 60Bb are in the X direction. Magnetomotive force is generated (see FIG. 17A). Further, a magnetomotive force in the Y direction is generated by the bundle of the conducting wire 60Aa, the conducting wire 60Ad, and the conducting wire 60Ab and the bundle of the conducting wire 60Ba, the conducting wire 60Bd, and the conducting wire 60Bb (see FIG. 17B).

  Further, when even number of conductors 60 are arranged in the X direction and the Y direction, magnetomotive force in the X direction is generated by the bundle of the conductors 60Aa and 60Ba and the bundle of the conductors 60Ab and 60Bb (FIG. 19 ( A)). Further, a magnetomotive force in the Y direction is generated by the bundle of the conducting wires 60Aa and 60Ab and the bundle of the conducting wires 60Ba and 60Bb (see FIG. 19B).

  As described above, the magnetomotive force in the magnetomotive force generation region 20 of the present embodiment can be regarded as a combination of the magnetomotive force in the X direction and the magnetomotive force in the Y direction. Therefore, the current supplied to each conducting wire 60 can be regarded as a combined value of the currents supplied to generate the magnetomotive force in each direction.

  That is, in this embodiment, when the reference current is I, the number of magnetomotive forces per unit in the Halbach array is n, and the magnetomotive force generation region 20 where the magnetomotive force is 0 degrees (θ = 0) is the reference position. The currents flowing in the respective conductive wires 40 of the kth magnetomotive force generation region 20 on the + X side from the reference position are as follows.

  That is, a current obtained by I × (cos (2π × k / n) + sin (2π × k / n)) flows through the conductor 60Aa, and I × (cos (2π × k / n) −sin through the conductor 60Ba. (2π × k / n)) flows, and the current obtained by I × (−cos (2π × k / n) + sin (2π × k / n)) flows in the conductor 60Ab, and the conductor 60Bb Current flowing through −I × (cos (2π × k / n) + sin (2π × k / n)) flows.

  In the case where the odd number of conductors 60 are arranged in the X direction and the Y direction (see FIG. 16), the current obtained by I × cos (2π × k / n) flows through the conductor 60Da, and the conductor 60Db passes through the conductor 60Db. A current obtained by −I × cos (2π × k / n) flows, a current obtained by I × sin (2π × k / n) flows through the conductor 60Ad, and −I × sin (2π × 2) through the conductor 60Bd. The current required by k / n) flows.

  According to the magnetic field generator 12G of the present embodiment, the number of the conductive wires 60 that generate magnetomotive force is larger than the number of the conductive wires 30 of the first embodiment and the conductive wires 40 of the third embodiment. A magnetomotive force larger than that of the third embodiment can be generated. Similar to the fourth embodiment, adjacent conductors 60 may be fused across the magnetomotive force generation region 20 at the boundary between adjacent magnetomotive force generation regions 20.

[Summary]
The magnetic field generators 12A, 12B, 12C, 12D, 12E, 12F, and 12G according to the first to seventh embodiments described above are not limited to an electromagnetic cooker, but a large-capacity induction heating such as an industrial heater. It can be applied to the device. Further, the present invention can be applied to various devices such as a power feeding device (charging device) that transmits electric energy (electric power) by electromagnetic induction. According to each embodiment, since the magnetic field for transmitting energy can be formed efficiently, the efficiency of energy transmission can be improved. At this time, since the magnetic flux leaking around the magnetic field generation unit can be suppressed, energy loss can be suppressed, and the shielding member for suppressing the magnetic flux leaking around can be simplified.

  Further, according to each embodiment, the direction of the magnetomotive force can be freely changed by providing a plurality of pairs of conductive wires in a direction intersecting the cross section constituting the magnetomotive force generation region 20. As a result, the magnetic flux density in a farther space can be increased, that is, the magnetic field can be exerted far.

DESCRIPTION OF SYMBOLS 10 Magnetic field generator 12 (12A-12G) Magnetic field generation part 14 Power supply part 20 (21-26) Magnetomotive force generation area 30, 40, 50, 60 Conductor 300, 400 Fusion conductor

Claims (9)

A plurality of magnetomotive force generation regions having a square cross section and capable of generating a magnetomotive force in a direction along the cross section;
A plurality of conductive wires provided at least at the corners of each of the magnetomotive force generation regions and disposed so as to intersect with the magnetomotive force generation region,
The magnetomotive force generation region is
A magnetic field generator arranged in a predetermined direction with n (n is an integer of 5 or more) as a set and rotating the magnetomotive force by 2π / n [rad]. When the reference current value is I, in the kth magnetomotive force generation region from the predetermined magnetomotive force generation region,
A current obtained by I × (sin (2π × k / n) + cos (2π × k / n)) is supplied to one set of the conductors in the diagonal corners with the polarity reversed. And
Currents obtained by I × (sin (2π × k / n) −cos (2π × k / n)) are exchanged with respect to each other with respect to the other set of the conductors in the diagonal corners. The magnetic field generator according to claim 1 to be supplied. When the reference current value is I, and the deviation of the magnetomotive force in the predetermined magnetomotive force generation region from the predetermined direction is α [rad],
In the kth magnetomotive force generation region from the predetermined magnetomotive force generation region,
Currents obtained by I × (sin (2π × k / n + α) + cos (2π × k / n + α)) are exchanged with respect to each other with respect to one set of the conductors in the diagonal corners. Supplied,
Currents obtained by I × (sin (2π × k / n + α) −cos (2π × k / n + α)) are exchanged with respect to each other with respect to the other conductors in the diagonal corners. The magnetic field generator according to claim 1, wherein the magnetic field generator is supplied. In the magnetomotive force generation region, a plurality of sets of the conducting wires paired in at least one of the predetermined direction and the orthogonal direction orthogonal to the predetermined direction are provided so as to be symmetric with respect to the diagonal line of the corner portion,
4. The magnetic field generator according to claim 2, wherein the same current as that of the conductor at the nearest corner is supplied to the conductor on the diagonal line. 5.   The conductive wire sandwiched between the first conductive wire on one diagonal and the second conductive wire on the diagonal adjacent to the one diagonal includes the first conductive wire and the second conductive wire. The magnetic field generator according to claim 4, wherein an average current is supplied to the lead wire.   In the magnetomotive force generation region, the same current as that of the conductive wire at the one corner is applied to the conductive wire located at the one corner portion side from the center in the predetermined direction and the one corner portion side from the center in the orthogonal direction. The magnetic field generator according to claim 4, wherein Each of the adjacent conductors straddling the boundary of the adjacent magnetomotive force generation region is fused to one fusion conductor,
The magnetic field according to any one of claims 1 to 6, wherein a current that is the sum of the adjacent conductors when the adjacent conductors across the boundary are not fused is supplied to the fusion conductor. Generator.   The magnetic field generator of any one of Claims 1-7 which does not have a hollow part inside the cross section of the said magnetomotive force generation area | region.   The magnetic field generator according to any one of claims 1 to 8, wherein, in the plurality of magnetomotive force generation regions, the conducting wires having the same current value are configured by one litz wire.