JP6166674B2 - Axial gap generator - Google Patents

Description

  The present invention relates to an axial gap generator including a stator including a coil, and a rotor including a magnet and opposed to the stator at an interval in a rotation axis direction.

  In recent years, there has been an increasing need for marine buoys (sensors) suitable for various uses to monitor, for example, water temperature, water quality, tsunami and ship invasion, for the purposes of submarine resource development, fishing, natural disasters and territorial defense. is there. Conventionally, such a marine buoy includes a battery, and the battery is replaced every predetermined period (for example, one and a half years). However, if the number of ocean buoys installed in the ocean increases in response to the activation of the above purpose, maintenance work such as battery replacement becomes unrealistic. Therefore, there is a demand for an unmaintained ocean buoy equipped with a private generator capable of generating power even at a very low speed (≦ 0.5 m / s) but stably flowing. In order to achieve maintenance-free for more than 10 years, in such an ocean buoy, it is essential to keep the mechanical mechanism to a minimum and hermetically enclose the electrical system, but it is not easy to realize it with a general generator. Absent. For example, Patent Document 1 discloses a so-called Randel-type rotating electrical machine that is used for an alternator of an automobile or the like as a conventional generator.

  The rotating electrical machine disclosed in Patent Document 1 includes a boss portion, first and second yoke portions that are arranged coaxially with the boss portion, and extend radially outward from both axial end portions of the boss portion, And a pole core having a plurality of claw-shaped magnetic pole portions alternately extending in the axial direction from the respective outer diameter portions of the first and second yoke portions and meshingly arranged in the circumferential direction, the boss portion, the first A rotor having a first and a second yoke part, and a field coil housed in a space surrounded by the plurality of claw-shaped magnetic pole parts, and a fixed held by the case so as to surround the rotor In a rotating electrical machine comprising a child, a fitting portion whose fitting direction is an axial direction is formed on an outer diameter portion of the first and second yoke portions, and is fitted to the fitting portion. A joint portion is formed on the claw-shaped magnetic pole portion, and the claw-shaped magnetic pole portion engages the fitted portion with the fitting portion. Parts in fitted by being held by the first and second yoke portions above.

  When a rotating electric machine (generator) having such a structure is applied to an ocean buoy, a generator installed in a casing of a controlled environment such as the atmospheric environment is used to rotate the tidal swirl placed in the sea. However, it is difficult to achieve long-term durability over a decade. Even if the rotation of the tidal swirl can be transmitted into the housing in a non-contact manner by a magnetic coupling or the like, the tidal swirl rotates at a low speed at the very low tidal current (≦ 0.5 m / s). Therefore, in order to generate electric power necessary for the generator, for example, it is necessary to use a speed increasing gear, and mechanical friction and durability problems may arise separately.

  On the other hand, in order to generate electric power efficiently even at a low speed, it is conceivable to use a multi-pole radial PM motor having a rotor having a plurality of permanent magnets having a strong magnetic force as a generator. However, since such a generator is a radial type, it is geometrically difficult to dispose the partition wall as a part of the housing between the stator and the rotor. Also, the cogging torque accompanying the attractive force between the magnetic poles of the stator and the magnet poles makes the tidal swirl rotating at a low speed by the very low tidal current easily stand still by static friction.

  Therefore, an axial gap generator (for example, see Patent Document 2) in which a stator and a rotor are opposed in the rotation axis direction, or an axial gap type brushless motor (for example, see Patent Document 3) is used as a generator. Conceivable.

  The axial gap generator disclosed in Patent Document 2 is an axial gap generator including a rotor having a magnet and a stator having a coil, and an air gap is provided between the magnet and the coil. And the rotor is configured such that the air gap changes according to the rotation of the rotor. Further, the axial gap type brushless motor disclosed in Patent Document 3 includes a stator including a coil, a rotor including a permanent magnet, and a rotor disposed at an interval in the axial direction from the stator, The coil is a strip-shaped wire, and is wound in a spiral shape so that the width direction of the strip-shaped wire is substantially coincident with the direction of the magnetic flux formed by the permanent magnet of the rotor. In such a generator, since it is an axial gap type, a partition wall having a predetermined thickness can be easily sandwiched between the stator and the rotor, and the stator, which is an inferior electrical component, is placed inside the casing. Can be isolated.

JP 2011-120419 A Japanese Patent Laid-Open No. 2002-325412 JP2012-50312A

  However, in the above-described generator, the extraction of the respective leads at the start and end of winding in a plurality of coils and the series connection thereof cannot be extracted from the rotor side, and must be skillfully incorporated in the yoke of the stator. The problem arises.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an axial gap generator that does not need to take out each lead at the start and end of winding in a plurality of coils and connect them in series. Is to provide.

  As a result of various studies, the present inventor has found that the above object is achieved by the present invention described below. That is, an axial gap generator according to one aspect of the present invention includes a stator including a coil, a rotor including a magnet, and a rotor disposed at a distance from the stator in a rotation axis direction. Are wound in a coil shape so as to finish winding on the outer peripheral side for the first time from the inner peripheral side, and have a long strip-shaped conductor member whose width in the coil axial direction is longer than the thickness in the coil radial direction, A plurality of sub-coils having a single pancake structure including an insulating member disposed between the turns of the wound strip-shaped conductor member, and the plurality of sub-coils are arranged in the circumferential direction around the position of the rotation axis The sub-coils adjacent to each other are connected in series with one winding end being the other winding start, and the coil portion at the one winding end position and the coil portion at the other winding start position. Doo is characterized by being overlapped with the coil axis direction.

  In such an axial gap generator, adjacent subcoils of a plurality of subcoils having a single pancake structure are connected in series with one winding end being the other winding start, and the one winding end position is The coil portion and the coil portion at the other winding start position are overlapped in the coil axis direction. For this reason, in order to connect a plurality of subcoils in series, such an axial gap generator does not need to take out the leads at the start and end of winding, and does not need to connect them in series.

  In another aspect, in the above-described axial gap generator, the conductor member is a wire formed of a superconductive material.

  According to this structure, an axial gap type generator provided with the coil of the subcoil which wound the wire formed of the superconducting material is provided. According to this configuration, the sub-coils adjacent to each other are connected in series with one winding end being the other winding start, and thus such an axial gap generator has one coil. It can be formed of a strip-like long conductor member. And according to this configuration, since the coil portion at the one winding end position and the coil portion at the other winding start position are overlapped in the coil axis direction, such an axial gap generator is Longitudinal twist can be almost eliminated. Therefore, such an axial gap type generator can maintain superconducting characteristics. In particular, such an axial gap generator is suitable when the wire is formed of an oxide-based superconducting material for which connection is not established while maintaining superconducting characteristics.

  In another aspect, in the above-described axial gap generator, the stator further includes a stator-side yoke that is provided on a surface opposite to a surface facing the rotor and is formed of a magnetic material. It is characterized by that.

  In such an axial gap type generator, since the stator side yoke is provided, the magnetic flux lines coming out from the magnet surface of the rotor penetrate the subcoil, and through the stator side yoke with a relatively low magnetic resistance, It passes through the subcoil adjacent to the penetrating subcoil and is guided to the adjacent magnet surface having the opposite polarity. Therefore, such an axial gap generator can make the magnetic circuit in such a closed loop. As a result, such an axial gap generator can make the magnetic flux lines near the coil parallel to the coil axis, lower the magnetic resistance of the entire magnetic circuit, and increase the magnetic field strength. As a result, An axial gap generator can improve power generation capacity. And since the magnetic flux lines near the coil can be made parallel to the coil axis, such an axial gap generator can suppress the magnetic flux lines penetrating from the side of the strip-shaped conductor member, and suppress the eddy current generated by the magnetic flux lines. The braking torque resulting from the eddy current can be suppressed. Therefore, such an axial gap generator can generate a larger amount of electric power compared to a case where the stator side yoke is not provided.

  In another aspect, in the above-mentioned axial gap generator, the stator side yoke is a member formed by compression molding soft magnetic powder having an insulating film. Preferably, the soft magnetic powder is iron-based soft magnetic powder, and more preferably, the soft magnetic powder is pure iron powder.

  Unlike the rotor-side yoke, the magnetic flux lines that penetrate the stator-side yoke change the direction and strength of the magnetic field in a sinusoidal shape due to the movement of the magnet due to the rotation of the rotor. For this reason, when the stator side yoke is formed of a magnetic material having conductivity, an eddy current is generated in the stator, and braking torque resulting from the eddy current is applied to the rotor. However, in the axial gap generator, the stator side yoke is a compression-molded member made of soft magnetic powder having an insulating film, so the axial gap type generator has a magnetic flux line penetrating the stator side yoke. The current path through which the accompanying eddy current flows can be inhibited, and the eddy current can be suppressed.

  Moreover, in another aspect, in the above-described axial gap generator, the stator side yoke is wound in a coil shape and has a long strip shape in which the width in the coil axial direction is longer than the thickness in the coil radial direction. Characterized in that it is a member of a single pancake structure comprising: electromagnetic soft iron or pure iron, and an insulating member disposed between the turns of the strip-shaped electromagnetic soft iron or pure iron wound in the coil shape. .

  In such an axial gap generator, the stator side yoke is a band-shaped electromagnetic soft iron or pure iron single pancake structure member wound through an insulating member. Therefore, the axial gap generator By means of the insulating member provided for each turn, the current path through which the eddy current accompanying the magnetic flux lines passing through the stator side yoke flows can be inhibited, and the eddy current can be suppressed.

  In another aspect, in the above-described axial gap generator, the band-shaped electromagnetic soft iron or pure iron has a thickness equal to or less than a skin depth corresponding to a power generation frequency.

  In such an axial gap generator, the strip-shaped electromagnetic soft iron or pure iron has a thickness less than or equal to the skin depth. Therefore, the axial gap generator generates an eddy current generated in the strip-shaped electromagnetic soft iron or pure iron. Furthermore, it can suppress effectively.

  In another aspect, in the above-described axial gap generator, the rotor further includes a rotor-side yoke formed of a magnetic material on a surface opposite to a surface facing the stator. It is characterized by.

  In such an axial gap generator, since the rotor side yoke is provided, the magnetic flux lines coming out from the back surface of the magnet in the rotor (the surface opposite to the surface facing the stator) are rotated with a relatively low magnetic resistance. It is led to the back of the magnet having the opposite polarity next to it through the child side yoke. Therefore, such an axial gap generator can make the magnetic circuit in such a closed loop. As a result, such an axial gap generator can make the magnetic flux lines near the coil parallel to the coil axis, lower the magnetic resistance of the entire magnetic circuit, and increase the magnetic field strength. Can be improved. And since the magnetic flux lines near the coil can be made parallel to the coil axis, such an axial gap generator can suppress the magnetic flux lines penetrating from the side of the strip-shaped conductor member, and suppress the eddy current generated by the magnetic flux lines. The braking torque resulting from the eddy current can be suppressed. Therefore, such an axial gap generator can generate a larger amount of electric power compared to a case where the stator side yoke is not provided.

  In another aspect, the above-described axial gap generator further includes a casing that can be hermetically sealed, the stator is disposed in the casing, and the rotor is disposed outside the casing. The portion of the casing interposed between the stator and the rotor is made of a non-magnetic and insulating material, or the skin depth corresponding to the power generation frequency is 10 times the thickness of the portion of the casing. It is characterized by being formed of a material having a large resistance value.

  In such an axial gap generator, since the stator is arranged in a sealable casing, the axial gap generator can seal the electrical components such as the stator coil in the casing, and is relatively long. Insulation can be stably maintained over a period of time. In the axial gap generator, the casing portion (partition wall) interposed between the stator and the rotor is formed of a nonmagnetic and insulating material. The type generator can be directly guided to the stator coil without reducing the magnetic flux lines emitted from the rotor magnet, and can prevent a decrease in power generation capacity. Alternatively, in the axial gap generator, the casing portion (partition wall) interposed between the stator and the rotor is formed of a high-resistance material having the resistance value. The gap generator does not generate an eddy current in the housing portion even if the magnetic flux lines are pulled in the circumferential direction as the rotor rotates (even if the strength changes at the fixed position). As a result, in the axial gap generator, the magnetic field is not attenuated due to the eddy current, so that a decrease in the power generation capacity can be suppressed.

  In another aspect, in the above-described axial gap generator, the non-magnetic and insulating material further has a heat insulating property. The non-magnetic and insulating material is preferably any one of glass, ceramic and glass fiber reinforced resin.

  In such an axial gap generator, since the casing portion is made of a heat insulating material, it is possible to suppress the intrusion of heat from the outside. In particular, the axial gap generator is suitable when the strip-shaped conductor member is a superconductive material.

In another aspect, in the above-described axial gap generator, the magnet is a permanent magnet, and the width and thickness in the rotation direction of the magnet are W _PM and T _PM , respectively. was a _{T C,} the distance between the facing surfaces of the said magnet coil when the _g, and _{W PM / (T PM + T} C + g) wherein flat satisfy conditions of ≧ 1.5 is.

  Since such an axial gap type generator satisfies the above flat condition, even if a portion (partition wall) of the casing is interposed between the stator and the rotor, as will be analyzed later, preferably, Reduction in power generation capacity can be suppressed.

  According to another aspect, the above-described axial gap generator further includes a core disposed in each core of each of the plurality of subcoils.

  Such an axial gap generator has a core in each core part of each subcoil, so that more magnetic flux lines emitted from the rotor magnet can be guided into the core part of the coil, and its power generation capacity can be improved. .

  The axial gap generator according to the present invention does not need to take out each lead at the start and end of winding in a plurality of coils and connect them in series.

It is a perspective view which shows the structure of the ocean buoy in 1st Embodiment. It is a partial cross section figure which shows the part concerning the axial gap type generator of the 1st aspect in the ocean buoy of 1st Embodiment. It is a figure which shows the structure of the axial gap type generator of the 1st aspect in the ocean buoy of 1st Embodiment. It is a figure for demonstrating the coil in the axial gap type generator shown in FIG. It is a figure for demonstrating the item in the axial gap type generator shown in FIG. It is a figure which shows the magnetic characteristic of the permanent magnet in the axial gap type generator shown in FIG. It is a figure which shows the magnetic characteristic of various permanent magnets. It is a partial cross section figure which shows the structure of the ocean buoy in 2nd Embodiment. It is a partial cross section figure which shows the part concerning the axial gap type generator of the 2nd aspect in the ocean buoy of 2nd Embodiment. It is sectional drawing which shows the structure of the axial gap type generator of a 3rd aspect. It is sectional drawing which shows the structure of the axial gap type generator of a 4th aspect. It is sectional drawing which shows the structure of the axial gap type generator of a 5th aspect.

  Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted suitably. Further, in this specification, when referring generically, it is indicated by a reference symbol without a suffix, and when referring to an individual configuration, it is indicated by a reference symbol with a suffix.

(First embodiment)
FIG. 1 is a perspective view showing the configuration of the ocean buoy in the first embodiment. FIG. 2 is a partial cross-sectional view showing a portion related to the axial gap generator of the first mode in the ocean buoy of the first embodiment. FIG. 3 is a diagram illustrating a configuration of an axial gap generator according to a first aspect of the ocean buoy according to the first embodiment. FIG. 3A shows a cross-sectional view, and FIG. 3B is a top view of the coil. A dashed line in FIG. 3B indicates a cross-sectional line in FIG. FIG. 4 is a view for explaining a coil in the axial gap generator shown in FIG. 3.

  The axial gap generator in the present embodiment includes a stator including a coil, and a rotor including a magnet and spaced from the stator in the rotation axis direction, and the coil extends from the inner peripheral side. The strip-shaped conductor member wound in a coil shape so as to finish winding on the outer peripheral side for the first time, and having a long strip-shaped conductor member whose width in the coil axial direction is longer than the thickness in the coil radial direction, and the strip shape wound in the coil shape A plurality of sub-coils having a single pancake structure including an insulating member disposed between the turns of the conductor member, the plurality of sub-coils being arranged in the circumferential direction around the rotation axis, and the sub-coils adjacent to each other being One winding end is connected in series with the other winding start, and the coil portion at the one winding end position and the coil portion at the other winding start position overlap in the coil axis direction. It is. Such an axial gap generator can generate electric power by rotating the rotor around the rotation axis with respect to the stator, and can be applied to various applications. In this embodiment, in the submarine resource development, fishery, natural An axial gap generator applied to marine buoys (sensors) suitable for various uses to monitor water temperature, water quality, tsunami, ship invasion, etc., for disaster and territorial defense, etc. will be described below. .

  In FIG. 1, the ocean buoy Sa in the first embodiment includes a floating FL, an axial gap generator (hereinafter abbreviated as “AG generator”) PGa, a swirl vane WW, a tail CA, and a weight. WE.

  The floating FL is a device that generates buoyancy, and is, for example, a hollow cylindrical body formed of a metal material and hermetically sealed. The floating FL is connected to the AG type generator PGa by a first wire WI1 formed of, for example, a metal material.

  The AG type generator PGa is an axial gap type generator including a stator STa including a coil 12a and a rotor RTa including a magnet 14a and spaced from the stator STa in the rotation axis direction. . For the ocean buoy Sa of the present embodiment, the AG generator PGa of the first aspect is used, and the AG generator PGa of the first aspect will be described in detail later.

  The swirl vane WW is a device that receives a fluid flow and causes the rotary shaft 41 to generate a rotational motion. The rotary shaft 41 is connected to the rotor RTa of the AG generator PGa, and the rotary motion generated by the swirl vane WW is transmitted to the AG generator PGa via the rotary shaft 41 to rotate the rotor RTa. In this embodiment, the swirl wing WW is mounted on the ocean buoy Sa, and is used by being submerged in the ocean during use of the ocean buoy Sa. In this embodiment, for example, as shown in FIG. 2, the swirl vane WW includes two first and second swirl vanes WW-1 and WW2. These first and second swirl vanes WW-1 and WW-2 are arranged in parallel in the cylindrical first support body MB1 having a rectangular cross section so that the axial directions of the rotary shafts 41 are aligned.

  Each of the first and second swirl vanes WW-1 and WW-2 includes the rotary shaft 41, the vane member 42, the spoke 43, and the fixed member 44, but has the same shape. Therefore, it demonstrates below, without distinguishing both.

  The rotating shaft 41 is a cylindrical member that is long in one direction, and as described above, one end thereof is connected to and fixed to the rotor RTa of the AG generator PGa.

  The wing member 42 is a member for receiving a flow of seawater (tidal current), and is, for example, a flat plate-shaped member. The wing member 42 may be an arbitrary number, but in the example shown in FIG. 2, the first to fourth wing members 42-1 to 42-4 are provided.

  The fixing member 44 is a member for connecting and fixing the wing member 42 to the rotating shaft 41 via the spoke 43, and is, for example, a mesh-like disk in the example shown in FIG. In this embodiment, for example, as shown in FIG. 2, the fixing member 44 includes two pairs of first and second fixing members 44 for supporting the wing member 42 at both ends via spokes 43. -1 and 44-2. Each of the pair of first and second fixing members 44-1 and 44-2 is formed with a through-opening through which the rotation shaft 41 is inserted at the center position. The first fixing member 44-1 is fixed by the rotation shaft 41 being inserted into the through opening, and the second fixing member 44-2 is the first fixing member 44 having the rotation shaft 41 inserted through the through opening. -1 to the rotation axis direction, and is fixed with an interval corresponding to the length between both ends of the wing member 42.

  The spoke 43 is a member for connecting the wing member 42 and the fixing member 44 to each other, and is, for example, a wire. In the present embodiment, for example, as shown in FIG. 2, the spoke 43 is composed of four first to fourth pieces to connect one wing member 42 with four pieces and two pairs of spokes 43 at both ends. In accordance with the wing members 42-1 to 42-4, sixteen, eight pairs of eleventh to forty-second spokes 43-11 to 43-42 are provided.

  The pair of spokes 43 includes two wires connected at one end and fixed in a substantially V shape. Each of the eleventh and twelfth spokes 43-11, 43-12 is the substantially V-shaped connecting portion, and at each one end portion orthogonal to the axial direction at both axial end portions of the first wing member 42, Each of the first and second fixing members 44-1 and 44-2 is connected and fixed at each of the substantially V-shaped tip portions. Each of the 21st and 22nd spokes 43-21 and 43-22, each of the 31st and 32nd spokes 43-31 and 43-32, and each of the 41st and 42nd spokes 43-41 and 43-42, respectively. Similarly to the 12th spokes 43-11 and 43-12, the second to fourth wing members 42-2 to 42-4 and the first and second fixing members 44-1 and 44-2 are connected to each other. It is fixed. These first to fourth wing members 42-1 to 44-4 are equally spaced in the circumferential direction (see FIG. 2) by the sixteen, eight pairs of eleventh to forty-second spokes 43-11 to 43-42. In the example shown, they are arranged at intervals of 360/4 = 90 degrees. The first to fourth wing members 42-1 to 44-4 are connected so as to be adjustable in angle at the substantially V-shaped connecting portions of the eleventh to forty-second spokes 43-11 to 43-42. Therefore, the angle with respect to the rotating shaft 41 can be adjusted. The angle with respect to the rotating shaft 41 is formed by the rotating shaft 41 and a plane formed by the rotating shaft that becomes the axis of rotation of the wing member 42 when adjusting the angle, and a plane of the flat plate-shaped wing member 42. Is an angle. Thereby, the swirl vane WW of the present embodiment can be set at an appropriate angle according to the flow velocity of the tidal current (for example, annual average velocity).

  The tail CA is a member for directing the first and second swirl wings WW-1 and WW-2 in a direction corresponding to the flow direction of the tidal current. For example, as shown in FIG. 2, the tail blade CA is a flat plate-like member, and one end portion of the tail blade CA is close to the other end of the second support member MB2 having a prismatic shape that is long in one direction. Thus, the second support member MB2 is connected and fixed. One end of the second support member MB2 is connected to the bottom surface of the first support member MB1 at a substantially central position in the juxtaposition direction of the first and second swirl blades WW-1 and WW-2 arranged side by side. Has been fixed.

  The weight WE is a member for sinking the first and second swirl wings WW-1 and WW-2, and is, for example, a cylindrical body having a predetermined weight. One end of the weight WE is connected to the first support member MB1 by a second wire WI2 formed of, for example, a metal material, and the other end thereof is, for example, an anchor or the like by a third wire WI3 formed of, for example, a metal material. It is connected to an approximate fixture.

  Each member FL, WI1, MB1, WW, MB2, CA, WI2, WE, WI3 of such a marine buoy Sa is formed of a material having high corrosion resistance, such as stainless steel, reinforced plastic, and carbon fiber. It is preferable.

  The AG generator PGa described above will be described in more detail below. The generator used for the ocean buoy Sa in the first embodiment is the AG generator PGa of the first aspect, and two generators corresponding to the two first and second swirl vanes WW-1 and WW-2. First and second AG type generators PGa-1 and PGa-2. The rotating shaft 41 of the first swirl vane WW-1 is connected and fixed to the rotor RTa of the first AG generator PGa-1, and the rotating shaft 41 of the second swirl vane WW-2 is the second AG generator. It is connected and fixed to the rotor RTa of PGa-2. Each of the first and second AG type generators PGa-1 and PGa-2 includes a casing 31a, a stator STa, and a rotor RTa, which are substantially similar to each other. Except for the difference of the parts, the following description will be made without distinguishing between the two.

  The casing 31a is a hollow box having a substantially rectangular parallelepiped shape that can be hermetically sealed, and includes a stator STa. The housing 31a may be provided for each of the first and second AG type generators PGa-1 and PGa-2, but in the present embodiment, the first and second AG type generators PGa-1 and PGa-2 are provided. Commonly provided.

  In the example shown in FIG. 2, the housing 31 a further incorporates an information acquisition unit 21 a so that part of the information acquisition unit 21 a faces outside, and further incorporates an electrical component 22 a. The information acquisition unit 21a is a device that acquires predetermined information. For example, the information acquisition unit 21a is a camera that captures an underwater state, for example, a water quality sensor that detects water quality such as salt concentration, a water temperature sensor that detects water temperature, and the like. When the information acquisition unit 21a requires electric power for driving, the information acquisition unit 21a is supplied with power from the AG generator PGa via the electrical component 22a or directly. The electrical component 22a is a device for supplying power from the AG generator PGa, controlling the information acquisition unit 21a, storing the information acquired by the information acquisition unit 21a, and transmitting the information to the outside at a predetermined interval. is there. The electrical component 22a converts the AC power supplied from the AG generator PGa into power suitable for the information acquisition unit 21a as necessary. For example, the electrical component 22a converts AC power into DC power or converts a voltage value into a predetermined value.

  The inside of the housing 31a is fully filled with, for example, an incompressible liquid 33a such as oil, and a volume adjustment bellows or the like for eliminating a pressure difference between the inside and outside of the housing 31a is provided at an appropriate position of the housing 31a. The pressure regulating mechanism 32 is provided.

The casing 31a has a first support member such that the stator STa disposed inside the casing 31a is coupled to the rotating shaft 41 of the swirl vane WW and faces the rotor RTa disposed outside the casing 31a. It is connected and fixed to MB1. The portion (partition wall) 13a of the casing 31a interposed between the stator STa and the rotor RTa is made of a nonmagnetic and insulating first material or a skin depth corresponding to the power generation frequency. It is made of a second material having a resistance value that is at least 10 times greater than the thickness of the portion 31a. As the first material of the partition wall 13a, for example, ceramic, glass, glass fiber, and reinforced plastic are desirable. The coil 12a of the stator STa includes a plurality of subcoils 12a as will be described later, and the power generation frequency is a value obtained by multiplying the rotational speed of the rotor RTa by the number of subcoils 12a ( (Power generation frequency) = (Rotation speed of rotor RTa) × (Number of subcoils 12a) Skin depth (skin thickness) δ is generally δ = (ρ / πfμ) ^1/2 depending on the material properties of the partition wall 13a. ² (where f is the power generation frequency, μ is the magnetic permeability of the partition wall 13a, ρ is the electrical conductivity of the partition wall 13a), the frequency is sufficiently small, and the strength can be secured even if the partition wall 13a is sufficiently thin. For example, a metal such as stainless steel or titanium can be used as the second material of the partition wall 13a.

  The stator STa is a non-rotating part and includes a coil 12a including a plurality of subcoils 121a arranged in the circumferential direction.

  More specifically, the stator STa includes, for example, a stator side yoke 11a, a coil 12a, and a core 16, as shown in FIGS.

  The stator side yoke 11a is a disk-shaped member made of a magnetic material that supports the coil 12a. Therefore, the stator side yoke 11a is provided on the surface of the stator STa opposite to the surface facing the rotor RTa.

  Such a stator side yoke 11a may be a member formed by compressing soft magnetic powder having an insulating film, for example. Such a stator side yoke 11a is magnetically isotropic. For example, the magnetic permeability is isotropic. The soft magnetic powder is a ferromagnetic metal powder, and more specifically, for example, pure iron powder, iron-based alloy powder (Fe-Al alloy, Fe-Si alloy, Sendust, Permalloy, etc.), amorphous powder, etc. Is mentioned. These soft magnetic powders can be produced, for example, by a method of making fine particles by an atomizing method or the like, or a method of finely pulverizing iron oxide or the like and then reducing it. In general, since the saturation magnetic flux density is large when the magnetic permeability is the same, the soft magnetic powder is particularly preferably a metal-based material such as the above pure iron powder, iron-based alloy powder, and amorphous powder. The stator side yoke 11a obtained by compression-molding such a soft magnetic powder having an insulating film can be formed by known conventional means such as powder formation in the case of manufacturing a so-called powder core.

  The stator side yoke 11a composed of such a dust core can control the magnetic properties by the particle size and particle size distribution of the powder and the density of the molded body. For example, by increasing the density of the molded body, It is possible to suppress eddy current loss by increasing the magnetic susceptibility and reducing the particle size of the powder. For this reason, in order to implement | achieve the electromagnetic characteristic calculated | required by the stator side yoke 11a, the particle size of the powder used for a compact, the density of a molded object, etc. are adjusted.

  Further, for example, the stator side yoke 11a is wound in a coil shape, and has a long strip-shaped electromagnetic soft iron or pure iron whose width in the coil axis direction is longer than the thickness in the coil radial direction, and the coil shape. It may be a member of a single pancake structure provided with an insulating member disposed between each turn in the band-shaped electromagnetic soft iron or pure iron wound around. Such a stator-side yoke 11a has, for example, a long strip-shaped electromagnetic soft iron or pure iron having an insulation coating such as an insulating resin on one or both sides and having a width in the coil axis direction longer than a thickness in the coil radial direction. May be formed by winding so that the width direction is parallel to the coil axis direction. Further, for example, such a stator side yoke 11a is a long band-shaped member in which one insulating layer is laminated on one electromagnetic soft iron layer or pure iron layer, and the width direction is parallel to the coil axis direction. It may be formed by winding so as to be. In addition, for example, the stator side yoke 11a has the long band-shaped electromagnetic soft iron or pure iron sandwiched between the long band-shaped insulating member (for example, a tape made of a resin material) and the width direction is You may form by winding so that it may become parallel to a coil axial direction. The tape made of the resin material is a tape such as PEN (polyethylene naphthalate).

  The coil 12a is wound in a coil shape so that the coil 12a is wound from the inner peripheral side for the first time on the outer peripheral side, and is a long strip-shaped conductor member whose width in the coil axial direction is longer than the thickness in the coil radial direction, A plurality of subcoils 121a having a single pancake structure including an insulating member disposed between the turns of the strip-shaped conductor member wound in a shape. The band-shaped conductor member may be a superconductive material as will be described later, but here, it is a metal material having a relatively low resistance such as pure copper. As shown in FIG. 4, the sub-coil 121a having such a single pancake structure has a long strip-shaped conductor member whose width in the coil axis direction is longer than the thickness in the coil radial direction, and the width direction is the coil axis direction. It is formed by being wound around the coil bobbin 16 while being insulated by an insulating member so as to be parallel and to be wound from the inner peripheral side for the first time on the outer peripheral side. The coil bobbin 16 is a cylindrical member having a relatively low height. More specifically, such a sub-coil 121a has, for example, an insulating coating such as an insulating resin on one or both sides, and the long strip-shaped conductor member has a width direction parallel to the coil axis direction. It may be formed by winding. Further, for example, such a subcoil 121a is formed by winding a long band-shaped member in which one insulating layer is laminated on one conductor layer so that the width direction is parallel to the coil axis direction. May be. In addition, for example, such a sub-coil 121a has a width direction parallel to the coil axis direction while sandwiching the long strip-shaped conductor member with a long strip-shaped insulating member (for example, a tape made of a resin material). It may be formed by winding so as to be. The tape made of the resin material is a tape such as PEN (polyethylene naphthalate).

  As shown in FIGS. 3 and 4, the plurality of subcoils 121a are arranged in the circumferential direction around the position of the rotation shaft 41 (projection position of the rotation shaft when the rotation shaft is projected onto the stator side yoke 11a). The sub-coils 121a that are arranged and adjacent to each other in the circumferential direction are connected in series with one winding end being the other winding start, and the coil portion at the one winding end position and the coil at the other winding start position. The part is overlapped in the coil axis direction. In the example shown in FIGS. 3 and 4, the coil 12 a includes six subcoils 121 a-1 to 121 a-6, which are equally arranged concentrically in the circumferential direction around the position of the rotation shaft 41. Yes. In this way, the adjacent subcoils 121a are connected in series, with one winding end being the other winding start, and such a coil 12a can be formed of a single strip-like long conductor member. It is. In such a coil 12a, the coil portion at the one winding end position and the coil portion at the other winding start position are overlapped in the coil axial direction in the adjacent subcoils 121a. Such a coil 12a can substantially eliminate the twist in the longitudinal direction.

  Further, when a current flows due to the generation of dielectric electromotive force in the coil 12a, the plurality of subcoils 121a are configured as described above, and the permanent magnet 14a of the rotor RTa is also arranged in the same phase as described later. The subcoils 121a adjacent to each other in the circumferential direction are overlapped in the coil axis direction, and if the magnetic field at the center of one subcoil 121a increases, the other decreases, so both subcoils 121a cause reverse rotation. Electric power is generated and current flows in the opposite direction. However, since the coil portion at the one winding end position in one subcoil 121a and the coil portion at the other winding start position in the other subcoil 121a are connected in series, eventually, current flows in the same direction. It becomes a flowing arrangement. For this reason, it is possible to generate power efficiently by adding the induced electromotive force in series in each of the coil portions that are overlapped in the coil axis direction between the subcoils 121a adjacent to each other in the circumferential direction.

  In the present embodiment, each of the plurality of subcoils 121a in the coil 12a formed as described above is arranged on one main surface of the stator side yoke 11a in a state where each coil bobbin 16 is disposed in each core portion. Arranged. Such a coil bobbin 16 functions as a core if formed of a magnetic material. In the present embodiment, the coil bobbin 16 includes six coil bobbins 16-1 to 16-6 according to the six subcoils 121a-1 to 121a-6. The coil bobbin 16 functioning as such a core may be a member formed by compressing soft magnetic powder having an insulating film, for example, like the stator side yoke 11a. Note that the coil bobbin 16 composed of such a powder core can control the magnetic properties by the particle size and particle size distribution of the powder and the density of the molded body, and in order to realize the electromagnetic properties required for the coil bobbin 16, The particle size of the powder used for the body, the density of the molded body, and the like are adjusted. Although it is desirable to make the core 16 a magnetic material having a high magnetic permeability in order to gain even a little power generation capability, this embodiment does not necessarily require this. When the core 16 is a magnetic body, the core 16 and the permanent magnet 14a of the rotor RTa attract each other depending on the positional relationship, so that cogging torque is generated to some extent. In order to completely eliminate the cogging torque, it is one of the design options that the core portion 16 also serving as the bobbin is made of a magnetic material that is nonmagnetic or has a relatively low permeability.

  The rotor RTa is a rotating part and is a plurality of subcoils 121a (six subcoils 121a-1 to 121a-6 in the example shown in FIGS. 2 and 3) arranged in the circumferential direction in the coil 12a. Different numbers (number of poles) of magnets 14a are provided.

  More specifically, the rotor RTa includes, for example, a plurality of magnets 14a and a rotor-side yoke 15a as shown in FIGS.

  The rotor-side yoke 15a is a disk-shaped member made of a magnetic material that supports the plurality of magnets 14a. Therefore, the rotor side yoke 15a is provided on the opposite surface of the rotor RTa from the surface facing the stator STa. A through opening for inserting the rotating shaft 41 of the swirl vane WW is formed at the center position of the rotor side yoke 15a. The rotating shaft 41 of the swirl vane WW is inserted through the through opening and fixed. As a result, the rotor RTa is connected and fixed to the rotating shaft 41 of the swirl vane WW.

  The plurality of magnets 14a are magnets for generating a magnetic field and causing an induced electromotive force in the coil 12a by interacting with the coil 12a, and are, for example, permanent magnets. The plurality of magnets 14a are fixed at equal intervals in the circumferential direction on one main surface of the rotor-side yoke 15a. Each of the plurality of magnets 14a is magnetized in the axial direction (thickness direction), and the magnets 14a adjacent to each other are arranged such that the magnetic poles are in opposite directions. The plurality of magnets 14a rotate around the rotation shaft 41 when the rotor side yoke 15a rotates with the rotation of the rotation shaft 41 of the swirl vane WW.

  The ocean buoy Sa equipped with the AG generator PGa of the first aspect is substantially fixed at a predetermined longitude and latitude position by the second wire WI2, the weight WE, and the third wire WI3, and the buoyancy of the floating FL And the weight of the weight WE are arranged in the ocean so that the first and second swirl wings WW-1 and WW-2 are located at a predetermined depth. In the ocean buoy Sa arranged in the ocean, the tail wing CA is directed along the flow direction of the tidal current, whereby the tidal current flows from the opening at one end of the first support member MB1. Each wing member 42 of swirl wing WW-1 and WW-2 is pushed, and a tidal current flows out from the opening of the other end in the 1st support member MB1. When the blade members 42 of the first and second swirling blades WW-1 and WW-2 are pushed by the flowing current, the rotary shafts 41 of the first and second swirling blades WW-1 and WW-2 are pressed. Rotates, and each rotational motion of each rotating shaft 41 is transmitted to each rotor RTa in the first and second AG type generators PGa-1 and PGa-2. In each of the first and second AG type generators PGa-1 and PGa-2, each magnet 14a moves relative to each coil 12a of each stator RTa by the rotation of each rotor RTa. An induced electromotive force is generated in each coil 12a of the stator RTa, and each of the first and second AG generators PGa-1 and PGa-2 generates power.

  And in such a marine buoy Sa and AG type generator PGa, the mutually adjacent subcoils 121a in the plurality of subcoils 121a of the single pancake structure are connected in series with one winding end being the other winding start. The coil portion at the one winding end position and the coil portion at the other winding start position are overlapped in the coil axis direction. For this reason, the ocean buoy Sa and the AG type generator PGa do not need to take out the respective leads at the start and end of winding in order to connect the plurality of subcoils 121a in series, and also need to connect them in series. do not do.

  Further, since the ocean buoy Sa and the AG type generator PGa described above include the stator side yoke 11a, the magnetic flux lines coming out from the magnet 14a surface of the rotor RTa pass through the subcoil 121a and have a relatively low magnetic resistance. The stator side yoke passes through the subcoil 121a adjacent to the penetrating subcoil 121a through the stator side yoke 11a and is guided to the surface of the magnet 14a having the next opposite polarity. Therefore, the marine buoy Sa and the AG generator PGa can make the magnetic circuit in such a closed loop. As a result, the ocean buoy Sa and the AG type generator PGa can make the magnetic flux lines near the coil 12a parallel to the coil axis, reduce the magnetic resistance of the entire magnetic circuit, and increase the magnetic field strength. Such an ocean buoy Sa and the AG type generator PGa can improve the power generation capacity as a result. Since the magnetic flux lines in the vicinity of the coil 12a can be made parallel to the coil axis, such an ocean buoy Sa and the AG generator PGa can suppress the magnetic flux lines penetrating from the side surface of the strip-shaped conductor member. The eddy current generated by the wire can be suppressed, and the braking torque caused by the eddy current can be suppressed. Therefore, such an ocean buoy Sa and the AG type generator PGa can generate larger electric power than the case where the stator side yoke 11a is not provided.

  In addition, unlike the rotor side yoke 15a, the magnetic flux direction that penetrates the stator side yoke 11a changes the direction and strength of the magnetic field into a sine wave shape by the movement of the magnet 14a due to the rotation of the rotor RTa. For this reason, when the stator side yoke 11a is formed of a magnetic material having conductivity, an eddy current is generated inside the yoke 11a, and a braking torque resulting from the eddy current is applied to the rotor. However, in the above-described marine buoy Sa and AG generator PGa, when the stator side yoke 11a is a member formed by compression molding a soft magnetic powder having an insulating film, such marine buoy Sa and The AG generator PGa can inhibit the current path through which the eddy current associated with the magnetic flux lines passing through the stator side yoke 11a flows, and can suppress the eddy current.

  On the other hand, in the above-described marine buoy Sa and AG generator PGa, when the stator side yoke 11a is a band-shaped electromagnetic soft iron or pure iron single pancake structure member wound through an insulating member, Such an ocean buoy Sa and the AG type generator PGa can obstruct a current path through which an eddy current accompanying a magnetic flux line passing through the stator side yoke 11a flows by the insulating member arranged for each turn. Can be suppressed.

  In the case where the stator side yoke 11a is a band-shaped electromagnetic soft iron or pure iron single pancake structure member wound via an insulating member, preferably the band-shaped electromagnetic soft iron or pure iron The thickness is below the skin depth corresponding to the frequency. Such an ocean buoy Sa and the AG type generator PGa can more effectively suppress eddy currents generated in the band-shaped electromagnetic soft iron or pure iron.

  Further, since the ocean buoy Sa and the AG type generator PGa described above include the rotor-side yoke 15a, the magnetic flux lines emitted from the back surface of the magnet 14a in the rotor RTa (the surface opposite to the surface facing the stator STa) are Then, it is guided to the back surface of the adjacent magnet 14a having the opposite polarity through the rotor side yoke 15a with a relatively low magnetic resistance. Therefore, the marine buoy Sa and the AG generator PGa can make the magnetic circuit in such a closed loop. As a result, the ocean buoy Sa and the AG type generator PGa can make the magnetic flux lines near the coil 12a parallel to the coil axis, reduce the magnetic resistance of the entire magnetic circuit, and increase the magnetic field strength. Such an ocean buoy Sa and the AG type generator PGa can improve the power generation capacity as a result. And since the magnetic flux line in the vicinity of the coil 12a can be made parallel to the coil axis, such an ocean buoy Sa and the AG type generator PGa can suppress the magnetic flux line penetrating from the side surface of the strip-shaped conductor member, and are generated by the magnetic flux line. The eddy current can be suppressed, and the braking torque resulting from the eddy current can be suppressed. Therefore, such a marine buoy Sa and the AG type generator PGa can generate larger electric power as compared with the case where the stator side yoke is not provided.

  In the marine buoy Sa and the AG generator PGa described above, preferably, the strip-shaped conductor member forming the coil 12a has a thickness equal to or less than the skin depth corresponding to the power generation frequency. In general, the current flowing through the coil flows only in the range up to the skin depth, and the current does not flow uniformly throughout the conductor cross section. Therefore, by setting the thickness of the strip-shaped conductor member to a skin depth or less, such an ocean buoy Sa and the AG type generator PGa can suppress eddy currents caused by magnetic flux lines penetrating the strip-shaped conductor member from the axial direction. The braking torque caused by the eddy current can be suppressed.

  Further, in the above-described marine buoy Sa and AG type generator PGa, the stator STa is disposed in the hermetically sealable casing 31a. Therefore, such marine buoy Sa and AG type generator PGa has the stator STa. Electrical components such as the coil 12a can be sealed in the housing 31a, and the insulation can be stably maintained for a relatively long period of time.

  In the ocean buoy Sa and the AG generator PGa described above, the partition wall 13a of the casing 31a interposed between the stator STa and the rotor RTa is formed of a nonmagnetic and insulating material. Then, such an ocean buoy Sa and the AG type generator PGa can guide the magnetic flux lines emitted from the magnet 14a of the rotor RTa to the coil 12a of the stator STa as they are without reducing the power generation capacity. Can be prevented.

  On the other hand, in the marine buoy Sa and the AG type generator PGa described above, the partition wall 13a of the casing 31a interposed between the stator STa and the rotor RTa is formed of a high resistance material having the resistance value. In such a case, such an ocean buoy Sa and the AG type generator PGa can be used even if the magnetic flux lines are run in the circumferential direction as the rotor RTa rotates (even if the strength changes at a fixed position). No eddy current is generated in the partition wall 13a of the body 31a. As a result, in such a marine buoy Sa and the AG type generator PGa, the magnetic field is not attenuated due to the eddy current, so that a decrease in the power generation capacity can be suppressed.

  FIG. 5 is a diagram for explaining the specifications of the axial gap generator shown in FIG. FIG. 6 is a diagram showing the magnetic characteristics of the permanent magnet in the axial gap generator shown in FIG. FIG. 7 is a diagram showing magnetic characteristics of various permanent magnets. 6 and 7, each horizontal axis is a magnetizing force, and each vertical axis is a magnetic flux density.

In the ocean buoy Sa and the AG type generator PGa described above, the magnet 14a is a permanent magnet, and as shown in FIG. 5, the width and thickness in the rotation direction of the magnet 14a are W _PM and T _PM , respectively. , the thickness of the coil and _{T C,} the distance between the facing surfaces of the said magnet coil when the _{g, W PM / (T PM} + T C + g) of ≧ 1.5 flat condition is satisfied Is preferred. By satisfying this flat condition, the ocean buoy Sa and the AG-type generator PGa preferably generate power even if the partition wall 13a is interposed between the stator STa and the rotor RTa as will be analyzed below. Can be prevented from decreasing.

First, the magnetic field formed by the permanent magnet 14a will be described. W The _{PM / (T PM + T C} + g) equivalent magnetic circuit model of flat conditions of ≧ 1.5, permeance B / H, the following equation (1-1), and the magnetic properties of the permanent magnets 14a B = f When linearly approximating (H) ≈Br (1-H / He), the following equation (1-2) is obtained. Note that _TY is the thickness of the stator side yoke 11a, and s is the circumferential distance between the magnets 14a adjacent to each other in the circumferential direction (gap length in the circumferential direction between the magnets 14a). Here, larger the permeability of the stator side yoke 11a and the rotor side yoke 15a is sufficiently, if a Myu»myu _0, the third term in the denominator of the equation (1-2) is negligible The expression (1-2) becomes the following expression (1-3). Here, (μ ₀ × He) / Br is a value specific to the material of the permanent magnet 14 ((μ ₀ × He) / Br≈1). Μ ₀ is the magnetic permeability in vacuum, He is the holding force of the permanent magnet, and Br is the residual magnetic flux density.

As shown in FIG. 6, the permeance is an inclination on a permeance line connecting the magnetic flux density B and the magnetic field strength H at the origin and the operating point. FIG. 7 shows the magnetic flux density B and the magnetic field strength H at the operating point. The magnetic properties of various permanent magnets used to determine are shown. More specifically, FIG. 7 shows magnetic characteristics of an alnico magnet, an Nd—Fe—B magnet, an SmCo ₅ magnet, and a ferrite magnet.

  Next, the magnetic field formed by the coil current of the coil 12a will be described.

The _{W PM / (T PM + T} C + g) ≧ 1.5 in equivalent magnetic circuit model of flat conditions, the magnetic field generated in the vicinity of the coil 12a is represented by the following formula (2-1). Like the above, greater the permeability of the stator side yoke 11a and the rotor side yoke 15a is sufficiently, if a Myu»myu _0, the second term in the denominator of the equation (2-1) is to be ignored The equation (2-1) becomes the following equation (2-2).

Next, the maximum power generation capacity of the AG generator PGa is estimated. Here, assuming that the material of the coil 12a is a closed circuit (short-circuited state) of a perfect conductor (zero resistance, that is, a superconductor), a magnetic field ^BPM generated by a permanent magnet and a coil flowing in the coil 12a according to the Lenz rule and the magnetic field B ^C generated by the current is, to cancel and cancel each other. In this case, the coil current value Imax is an index representing the maximum power generation capacity. That is, the magnetic field ^{B PM} is represented by the above formula (1-3), the magnetic field ^{B C} is represented by the formula (2-2) above, and these the magnetic field ^{B PM} and the magnetic field ^{B C} are equal to each other (B ^PM ≡B ^C ). This leads to the following equation (3). When the geometric parameter x is defined as x≡T _PM / (T _c + g), the following equation (4) is obtained. Therefore, generating capacity, by satisfying the flat condition _{W PM / (T PM + T} C + g) ≧ 1.5, mainly the and strength He of the permanent magnets 14a, depending on the product of the thickness _{T PM,} geometric The structure is insensitive and independent.

  By satisfying the flat condition as described above, the ocean buoy Sa and the AG generator PGa are not dependent on the geometric structure, and even if the partition wall 13a is interposed between the stator STa and the rotor RTa, Preferably, a decrease in power generation capacity is suppressed. That is, the magnetic flux emitted from the magnet 14a can flow into the adjacent magnet 14a after intersecting the coil 12a with more magnetic flux lines without immediately flowing into the adjacent magnet 14a by satisfying the flat condition. It is possible to suppress a decrease in power generation capacity. Therefore, it is possible to generate power even at a very low speed (≦ 0.5 m / s).

  Next, another embodiment will be described.

(Second Embodiment)
FIG. 8 is a partial cross-sectional view showing the configuration of the ocean buoy in the second embodiment. FIG. 9 is a partial cross-sectional view showing a portion related to the axial gap generator of the second mode in the ocean buoy of the second embodiment.

  The ocean buoy Sa according to the first embodiment includes the housing 31a filled with the incompressible liquid 33a. The ocean buoy Sb according to the second embodiment uses a housing sealed at the atmospheric pressure 33b. Is.

  The ocean buoy Sb in the second embodiment includes the AG generator PGb of the second aspect, the swirl wing WW, and the weight WE. The swirl wing WW and the weight WE in the ocean buoy Sb of the second embodiment are the same as the swirl wing WW and the weight WE in the ocean buoy Sb of the second embodiment, respectively, and thus description thereof is omitted.

  AG type generator PGb of the 2nd mode is provided with case 31b, stator STb, and rotor RTb.

  The casing 31b is, for example, a hollow sphere (spherical shell) that can be sealed at atmospheric pressure 33b, and includes a stator STb. The casing 31a of the first embodiment includes the stator STa, the information acquisition unit 21a, and the electrical component 22a in one box, but in the second embodiment, the casing 31b includes three first to first It comprises three housings 31b-1 to 31b-3.

  The first to third housings 31b-1 to 31b-3 have the same shape, and upper and lower hemispherical shells 31b-11, 31b-12; 31b-21, 31b-22; 31b-31, respectively. 31b-32. In the first to third housings 31b-1 to 31b-3, the upper and lower hemispherical shells 31b-11, 31b-12; 31b-21, 31b-22; 31b-31, 31b-32 are respectively sealed. By connecting the end faces to each other using a member, a spherical shell sealed in a waterproof state is obtained. These first to third casings 31b-1 to 31b-3 are combined with the swirl vane WW into the swirl vane WW from one end to the other end inside the third support body MB3 having a rectangular cross section. The first casing 31b-1, the second casing 31b-2, and the third casing 31b-3 are arranged in this order. And 3rd support body MB3 is connected with the weight WE via the 2nd wire WI2 like 1st support body MB1 of 1st Embodiment, This weight WE is anchored via the 3rd wire WI3, for example It connects with the fixture of omission of illustrations.

  And the 1st housing | casing 31b-1 incorporates the stator STb in AG type generator PGb of the 2nd aspect, the 1st electrical component 22b-1, and the 1st non-contact electric power transmission part 23-1. Yes. The second casing 31b-2 includes an information acquisition unit 21b and second and third non-contact power transmission units 23-2 and 23-3. The third casing 31b-3 includes a second electrical component 22b-2 and a fourth non-contact power transmission unit 23-4.

  These first to fourth non-contact power transmission units 23-1 to 23-4 are devices for transmitting power from one to the other in a non-contact manner, that is, without using a wiring. It is prepared for. In the first to fourth non-contact power transmission units 23-1 to 23-4 using this coil, the first non-contact power transmission unit 23-1 disposed in the first housing 31 b-1 When power is supplied, the second non-contact power transmission unit 23-2 is disposed in the second casing 31b-2 so as to face the first non-contact power transmission unit 23-1, so that the first 2 Induction electromotive force is generated in the non-contact power transmission unit 23-2. As a result, power is transmitted from the first non-contact power transmission unit 23-1 to the second non-contact power transmission unit 23-2. Similarly, when the AC power is supplied to the third contactless power transmission unit 23-3 disposed in the second casing 31b-2, the fourth contactless power transmission unit 23-4 becomes the third contactless power transmission unit 23-4. By being arranged in the third casing 31b-3 so as to face the contact power transmission unit 23-3, an induced electromotive force is generated in the fourth non-contact power transmission unit 23-4. As a result, power is transmitted from the third contactless power transmission unit 23-3 to the fourth contactless power transmission unit 23-4.

  The first electrical component 22b-1 supplies the power supplied from the AG generator PGa to the second casing 31b- by the first non-contact power transmission unit 23-1 and the second non-contact power transmission unit 23-2. 2 and the second electrical component 22b in the third housing 31b-3 by the third non-contact power transmission unit 23-3 and the fourth non-contact power transmission unit 23-4. -2 to transmit to -2. Similar to the information acquisition unit 21a of the first embodiment, the information acquisition unit 21b is a device that acquires predetermined information. When power is required for driving the information acquisition unit 21b, the first contactless power transmission unit 23- The power transmitted by the first and second contactless power transmission unit 23-2 is used. The information acquisition unit 21b transmits the acquired information to the second electrical component 22b-2 in the third housing 31b-3 by a transmission unit (communication unit) (not shown). The information acquisition unit 21b uses the third non-contact power transmission unit 23-3 and the fourth non-contact power transmission unit 23-4 to transfer the acquired information to the second electrical component 22b in the third housing 31b-3. -2 may be transmitted. The second electrical component 22b-2 uses the power transmitted by the first to fourth non-contact power transmission units 23-1 to 23-4, stores the information acquired by the information acquisition unit 21a, and stores the information. It is a device for transmitting the information to the outside at intervals.

  Similarly to the stator STb and the stator STa of the first embodiment, the stator STb includes a coil 12b that is a non-rotating portion and includes a plurality of subcoils 121b arranged in the circumferential direction. More specifically, the stator STb includes, for example, a stator side yoke 11b, a coil 12b, and a core 16, as shown in FIG. In the second embodiment, as described above, the first housing 31b-1 is a spherical shell. For this reason, the stator side yoke 11b in this 2nd Embodiment is formed so that the shape may follow the inner surface shape of the said spherical shell. Except for this point, the stator side yoke 11b is the same as the stator side yoke 11a in the first embodiment, and the description thereof is omitted. In addition, the coil 12b in the second embodiment is also configured such that the overall shape of the plurality of subcoils 121a matches the shape of the stator side yoke 11b along the inner surface shape of the spherical shell as described above. Yes. That is, each subcoil 121a in the coil 12b is arranged on the curved surface of the stator side yoke 11b. Except for this point, the coil 12b is the same as the coil 12a in the first embodiment, and a description thereof will be omitted. Moreover, since the core 16 in 2nd Embodiment is the same as that of the core (coil bobbin) 16 in 1st Embodiment, the description is abbreviate | omitted.

  Similar to the rotor RTa of the first embodiment, the rotor RTb is a rotating portion and includes magnets 14b having a different number (number of poles) from the plurality of subcoils 121a in the coil 12b arranged in the circumferential direction. More specifically, the rotor RTb includes a plurality of magnets 14b and a rotor-side yoke 15b as shown in FIG. In the second embodiment, as described above, the first housing 31b-1 is a spherical shell. For this reason, the rotor side yoke 15b in this 2nd Embodiment is formed so that the shape may follow the outer surface shape of the said spherical shell. That is, the rotor side yoke 15b has a shape of a part of a spherical shell. Except for this point, the rotor-side yoke 15b is the same as the rotor-side yoke 15a in the first embodiment, and the description thereof is omitted. Further, the plurality of magnets 14b in the second embodiment are also shaped to match the shape of the rotor side yoke 15b along the outer surface shape of the spherical shell as described above. That is, each magnet 14b is arranged on the curved surface of the rotor side yoke 15b. Except for this point, the plurality of magnets 14b are the same as the plurality of magnets 14a in the first embodiment, and thus description thereof is omitted.

  These stators STb are arranged in the first housing 31b-1 and built in the first housing 31b-1, and the rotor RTb is a stator STb arranged in the first housing 31b-1. And disposed outside the first housing 31b-1 so as to face each other via the first housing 31b-1.

  The ocean buoy Sb in the second embodiment and the AG type generator PGb of the second aspect have the same effects as the ocean buoy Sa and the AG type generator PGa of the first aspect in the first embodiment.

  Next, another aspect of the axial gap generator will be described.

(Other aspects of axial gap generator)
FIG. 10 is a cross-sectional view showing the configuration of the axial gap generator of the third aspect. FIG. 11: is sectional drawing which shows the structure of the axial gap type generator of a 4th aspect. FIG. 12 is a cross-sectional view showing the configuration of the axial gap generator of the fifth aspect.

  In the first and second embodiments, the AG generators PGa and PGb of the first and second modes have been described. However, the present invention is not limited to these modes, and other modes can be taken. Hereinafter, the AG type generators PGc to PGe of the third to fifth aspects will be described.

  The AG type generator PGc of the third aspect includes a coil 12c wound with a wire formed of a superconductive material. The AG-type generator PGc of the third aspect requires a coolant such as liquid nitrogen, and is used, for example, as a generator for thermal power plants, a generator for cogeneration power generation, and a generator for hydroelectric power plants. It is done. More specifically, the AG generator PGc of the third aspect includes a casing 31c, a stator STc, and a rotor RTa as shown in FIG.

  Since the rotor RTa in the AG generator PGc of the third aspect is the same as the rotor RTa in the AG generator PGa of the first aspect, description thereof is omitted. The rotor RTa is connected to the rotating shaft of a predetermined turning mechanism WM that generates a rotating motion on the rotating shaft of the turbine screw by combustion gas or water flow, and the rotating motion obtained by the turning mechanism WM is the rotating shaft. The rotor RTa rotates around the rotation axis.

  The stator STc is a non-rotating portion, like the stator STa in the AG generator PGa of the first aspect, and includes a coil 12c including a plurality of subcoils 121c arranged in the circumferential direction. More specifically, the stator STc includes, for example, a stator side yoke 11a, a coil 12c, and a core 16. Since the stator side yoke 11a and the core 16 in the stator STc of the third mode are the same as the stator side yoke 11a and the core 16 of the stator STa of the first mode, respectively, description thereof is omitted. The coil 12c in the stator STc of the third aspect is the same as the coil 12a in the stator STa of the first aspect except that the conductor member is a wire formed of a superconducting material, and thus the description thereof is omitted. To do.

  The casing 31c is a hollow box having a substantially rectangular parallelepiped shape that can be sealed, for example, in the same manner as the casing 31a in the AG generator PGa of the first aspect, and includes the stator STa. Then, as described above, since the coil 12c is formed of a superconductive material, the coil 12c is configured to cope with this. More specifically, the housing 31c is formed of a heat insulating material having a heat insulating property or a heat insulating structure such as a double structure. The inside of the casing 31c is filled with a coolant 33c for cooling the coil 12c of superconducting material, such as liquid nitrogen, for example, and inside and outside of the casing 31c are placed at appropriate positions in the casing 31c. A pressure adjusting mechanism 32 for eliminating the pressure difference is disposed, and for cooling the coolant 33c at an appropriate position of the casing 31c (in the example shown in FIG. 10, the pressure adjusting mechanism 32 is disposed). A refrigerator 34 is provided.

  A rotor RTa is disposed outside the casing 31c so as to face the stator STc disposed in the casing 31c. A portion (partition wall) 13c of the casing 31c interposed between the stator STc and the rotor RTa is a non-magnetic and insulating first material or a skin depth corresponding to the power generation frequency. It is made of a second material having a resistance value that is at least 10 times greater than the thickness of the portion 31a. And in the 3rd mode, these 1st and 2nd materials are materials with heat insulation further. The first material of the partition wall 13c is ceramic, glass, glass fiber, reinforced plastic, or the like. The second material of the partition wall 13c can be, for example, a thin metal material such as stainless steel or titanium that satisfies the skin depth condition.

  Such an AG type generator PGc of the third aspect has the same effects as the AG type generator PGa of the first aspect in the first embodiment.

  In the AG type generator PGc of the third mode, the adjacent subcoils 121c in the coil 12c are connected in series with one winding end being the other winding start, so the AG type power generation of the third mode The machine PGc can form the coil 12c with one strip-like long conductor member. And according to this structure, since the coil part of said one winding end position and the coil part of said other winding start position are piled up in the coil axial direction, AG type generator PGc of the 3rd mode is The twist in the longitudinal direction can be almost eliminated. Therefore, the AG type generator PGc of the third aspect can maintain superconducting characteristics. In particular, the AG-type generator PGc of the third aspect is suitable when the conductor member of the coil 12c is formed of an oxide-based superconducting material whose connection method is not established while maintaining superconducting characteristics. is there.

  Moreover, in the AG type generator PGc of the third aspect, since the casing 31c is formed of a heat insulating material including the partition wall 13c, it is possible to suppress the intrusion of heat from the outside. Therefore, also from this viewpoint, when the conductor member in the coil 12c is a superconductive material as described above, the AG type generator PGc of the third aspect is suitable.

  The AG type generator PGd of the fourth aspect is an inner rotor type generator. More specifically, the AG generator PGd of the fourth aspect includes a casing 31d, a stator STd (STd-1, STd-2), and a rotor RTd as shown in FIG.

  Since the stator STd is of an inner rotor type, the stator STd includes two first and second stators STd-1 and STd-2 so that they can be arranged on both sides of the rotor RTd. Each of the first and second stators STd-1 and STd-2 is a non-rotating portion, like the stator STc in the AG generator PGc of the third aspect, and has a plurality of subcoils arranged in the circumferential direction. The coil 12c provided with 121c is provided. More specifically, the first stator STd-1 includes, for example, a first stator side yoke 11a-1, a first coil 12c-1, and a first core 16-1. Since the first stator side yoke 11a and the first core 16-1 in the first stator STd of the fourth aspect are the same as the stator side yoke 11a and the core 16 of the stator STa of the first aspect, respectively. The description is omitted. The first coil 12c-1 in the first stator STd-1 of the fourth aspect is the same as the coil 12a in the stator STa of the first aspect, except that the conductor member is a wire formed of a superconductive material. Therefore, the description thereof is omitted. The second stator STd-2 includes, for example, a second stator side yoke 11a'-2, a second coil 12c-1, and a second core 16-2. Since the second stator side yoke 11a′-2 in the second stator STd of the fourth aspect is an inner rotor type, it penetrates through the rotation shaft of the turning mechanism WM formed at the center position thereof. Since it is the same as that of the stator side yoke 11a in the stator STa of the first aspect except that it further includes an opening, the description thereof is omitted. Since the core 16-2 is the same as the core 16 in the stator STa of the first aspect, the description thereof is omitted. Since the second core 16-2 in the second stator STd of the fourth aspect is the same as the core 16 in the stator STa of the first aspect, description thereof is omitted. The second coil 12c-2 in the second stator STd-2 of the fourth aspect is the same as the coil 12a in the stator STa of the first aspect except that the conductor member is a wire formed of a superconductive material. Therefore, the description thereof is omitted.

  The rotor RTd is a rotating part like the rotor RTa of the first aspect, and is different from the plurality of subcoils 121c in the first and second coils 12c-1 and 12c-2 arranged in the circumferential direction. The number (pole number) of magnets 14b is provided. More specifically, as shown in FIG. 11, the rotor RTd of the fourth aspect includes a plurality of magnets 14d and a rotor-side yoke 15d. In this fourth mode, since it is an inner rotor type, the plurality of magnets 14d are arranged on the rotor side yoke 15d so that both surfaces of the rotor 14d face the outside so that the magnetic flux is generated from both sides of the rotor RTd. ing. That is, the rotor-side yoke 15d is a disk-shaped member formed of a magnetic material, and is formed in a plurality of shapes corresponding to the outer shape of the magnet 14d at equal intervals in the circumferential direction at equal distances from the center position. The through-opening is provided. Each of the plurality of magnets 14d is fitted in each of the plurality of through openings and fixed by, for example, an adhesive, so that the rotor side yoke 15d has a plurality of magnets 14d so that both surfaces of the magnet 14d face the outside. The magnet 14a is supported. A through-opening for inserting the rotation shaft of the predetermined turning mechanism WM is formed at the center position of the rotor side yoke 15d. The rotation shaft of the turning mechanism WM is inserted through the through opening and fixed. As a result, the rotor RTd is connected and fixed to the rotation shaft of the turning mechanism WM, and the rotational motion obtained by the turning mechanism WM is transmitted through the rotation shaft and rotates around the rotation shaft.

  The casing 31d is, for example, a substantially rectangular parallelepiped hollow box that can be sealed, like the casing 31a in the AG generator PGa of the first aspect, and the first and second stators STd-1, STd- 2, the coil 12c is also formed of a superconducting material as described above, so that it can be adapted to this. And in the 4th mode, since it is an inner rotor type, case 31d has the 1st chamber for incorporating 1st stator STd-1, and the 2nd for incorporating 2nd stator STd-2. Two plate-shaped first and second partition walls 13c-1 and 13c for partitioning into a chamber and a third chamber for arranging a rotor between the first chamber and the second chamber -2. The first and second partition walls 13c-1 and 13c-2 are sequentially arranged in the housing 31d with a predetermined interval from the top surface to the bottom surface of the box housing 31d. The first and second partition walls 13c-1 and 13c-2 have a nonmagnetic and insulating first material or skin depth corresponding to the power generation frequency of the casing 31a, as in the partition wall 13c of the third mode. It is formed of a second material having a resistance value that is 10 times or more larger than the thickness of the portion, and these first and second materials are materials having heat insulation properties. A first stator STd-1 is disposed on the first partition 13c-1 facing the first chamber, and a second stator STd-2 is disposed on the second partition facing the second chamber. The A rotor RTd is disposed in the third chamber so as to face the first and second stators STd-1 and STd-21 disposed in the first and second chambers, respectively. Accordingly, the first partition 13c-1 is interposed between the first stator STd-1 and the rotor RTd, and the second partition 13c-2 is between the second stator STd-2 and the rotor RTd. Intervene in.

  Further, a through opening is formed at a substantially central position in each of the bottom surface of the box housing 31d and the second partition wall 13c-2, and the third chamber has a bottom surface and a second partition wall in the box housing 31d. 13c-2 is provided with a cylindrical member 35 that communicates with each of the through opening formed in the bottom surface of the box casing 31d and the through opening formed in the second partition wall 13c-2. A rotating shaft of a turning mechanism WM connected to the rotor RTd is inserted into the cylindrical member 35.

  The first and second chambers of the housing 31d are filled with the coolant 33c, the pressure adjusting mechanism 32 is disposed at an appropriate position of the housing 31d, and an appropriate position ( In the example shown in FIG. 11, a refrigerator 34 for cooling the coolant 33 c is disposed at a location where the pressure adjusting mechanism 32 is disposed. The casing 31d is provided with a plurality of flow pipes (not shown) for allowing the coolant 33c in the first chamber and the coolant 33c in the second chamber to flow through each other.

  Such an AG type generator PGd of the fourth aspect has the same effects as the AG type generator PGa of the first aspect in the first embodiment. And since AG type generator PGd of a 4th aspect is provided with the two 1st and 2nd coils 12a-1 and 12a-2 which are each arrange | positioned at the both sides of rotor RTd, one piece arrange | positioned at one side. As compared with the case of the coil 12, the rotational motion generated by the turning mechanism WM can be more efficiently converted into electric power.

  The AG generator PGe of the fifth aspect is an outer rotor type generator. More specifically, the AG-type generator PGe of the fifth aspect includes a casing 31e, a stator STe, and a rotor RTe as shown in FIG.

  The stator STe is a non-rotating portion, like the stator STc in the AG generator PGc of the third aspect, and includes a coil 12c including a plurality of subcoils 121c arranged in the circumferential direction. More specifically, the stator STe includes a coil 12c and a core 16, for example. In this fifth aspect, since it is an outer rotor type, the stator STe receives the magnetic flux from the rotor RTe from both surfaces of the coil 12c, so that the stator side yoke such as the stator side yoke 11a of the first aspect is used. Not equipped. Since the core 16 in the stator STe of the fifth aspect is the same as the core 16 in the stator STa of the first aspect, description thereof is omitted. The coil 12c in the stator STe of the fifth aspect is the same as the coil 12a in the stator STa of the first aspect except that the conductor member is a wire formed of a superconducting material, and thus the description thereof is omitted. To do.

  Since the rotor RTe is of an outer rotor type, the rotor RTe includes two first and second rotors STe-1 and STe-2 so that they can be arranged on both sides of the stator STe. The first and second rotations STe-1 and STe-2 are rotating portions, respectively, in the stator STe arranged in the circumferential direction, like the rotor STa in the AG generator PGa of the first aspect. A number (number of poles) of magnets 14a different from the plurality of subcoils 121c of the coil 12c are provided. More specifically, the first rotor RTe-1 includes, for example, a plurality of first magnets 14a-1 and a first rotor-side yoke 15a-1. The plurality of first magnets 14a-1 and the first rotor side yoke 15a-1 in the first rotor RTe-1 of the fifth aspect are respectively the plurality of magnets 14a and the rotor in the rotor RTa of the first aspect. Since it is the same as that of the side yoke 15a, its description is omitted. The second rotor RTe-2 includes, for example, a plurality of second magnets 14a-2 and a second rotor side yoke 15a-2. The plurality of second magnets 14a-2 and the second rotor side yoke 15a-2 in the second rotor RTe-2 of the fifth aspect are also respectively the plurality of magnets 14a and the rotor in the rotor RTa of the first aspect. Since it is the same as that of the side yoke 15a, its description is omitted. The first and second rotors RTe-1 and RTe-2 are arranged to face each other on the surfaces where the magnets 14a-1 and 14a-2 are arranged via the stator STe. It is connected to the rotating shaft of the WM. As a result, the first and second rotors RTe-1 and RTe-2 are rotated about the rotation axis by transmitting the rotation motion obtained by the turning mechanism WM via the rotation axis.

  The casing 31e is, for example, a relatively flat, substantially rectangular parallelepiped hollow box that can be hermetically sealed and has a built-in stator STe, similar to the casing 31a in the AG generator PGa of the first aspect. In the fifth aspect, the coil 12c is formed of a superconducting material as described above, and is configured to cope with this. In the fifth aspect, since the outer rotor type is used, the first rotor RTe-1 is disposed on the outer surface of the upper surface of the box-shaped casing 31e so as to face the stator STe disposed in the casing 31e. The second rotor RTe-2 is disposed outside the bottom surface so as to face the stator STe disposed in the housing 31e. A portion (ring plate-shaped first partition) 13d-1 of the casing 31e interposed between the first rotor RTe-1 and the stator STe, and the second rotor RTe-2 and the stator STe The part (ring plate-shaped second partition wall) 13d-2 interposed between them is the same as the third embodiment partition wall 13c, or a non-magnetic and insulating first material, or power generation The skin depth corresponding to the frequency is formed of a second material having a resistance value 10 times or more larger than the thickness of the portion of the casing 31a, and these first and second materials are further heat insulating materials.

  Further, a through opening is formed at a substantially central position on each of the upper surface and the bottom surface of the relatively flat box body 31e, and the upper surface and the bottom surface of the housing 31e are formed on the upper surface. A cylindrical member 36 communicating with each of the through-opening and the through-opening formed on the bottom surface thereof is disposed, and the second rotor RTe-2 is inserted into the cylindrical member 36 and connected to the first rotor d. The rotating shaft of the turning mechanism WM is inserted.

  The inside of the housing 31e is filled with the coolant 33c, the pressure regulating mechanism 32 is disposed at an appropriate position of the housing 31e, and an appropriate position of the housing 31c (example shown in FIG. 12). Then, the refrigerator 34 is disposed at a position where the pressure adjusting mechanism 32 is disposed.

  Such an AG type generator PGe of the fifth aspect has the same effects as the AG type generator PGa of the first aspect in the first embodiment. And since AG type generator PGe of a 5th aspect is provided with two 1st and 2nd rotors RTe-1 and RTe-2 each arrange | positioned at the both sides of stator STe, 1 arrange | positioned at one side. Compared to the case of the single rotor RT, the rotational motion generated by the turning mechanism WM can be more efficiently converted into electric power.

  In order to express the present invention, the present invention has been properly and fully described through the embodiments with reference to the drawings. However, those skilled in the art can easily change and / or improve the above-described embodiments. It should be recognized that this is possible. Therefore, unless the modifications or improvements implemented by those skilled in the art are at a level that departs from the scope of the claims recited in the claims, the modifications or improvements are not covered by the claims. To be construed as inclusive.

Sa, Sb Marine buoys PGa, PGb, PGc, PGd, PGe Axial gap generators STa, STb, STc, STd, STe Stator
RTa, RTb, RTc, RTd, RTe Rotor (rotor)
WW Swivel blade WM Swivel mechanism 11a, 11b Stator side yokes 12a, 12b, 12c Coils 13a, 13b, 13c, 13d Bulkheads 14a, 14b, 14c Magnets 15a, 15b, 15d Rotor side yoke 16 Cores 31a, 31b, 31c body

Claims (12)

A stator with a coil;
A magnet, and a rotor arranged at an interval from the stator in the direction of the rotation axis,
The coil is wound in a coil shape so that the coil is wound from the inner circumference side for the first time and finished on the outer circumference side, and a long strip-shaped conductor member whose width in the coil axial direction is longer than the thickness in the coil radial direction, and the coil A plurality of subcoils having a single pancake structure including an insulating member disposed between the turns in the strip-shaped conductor member wound in a shape;
The plurality of subcoils are arranged in the circumferential direction around the position of the rotation axis, and adjacent subcoils are connected in series, with one winding end being the other winding start, and the one winding end position being An axial gap generator, wherein the coil portion and the coil portion at the other winding start position are overlapped in the coil axis direction. The axial gap generator according to claim 1, wherein the conductor member is a wire formed of a superconducting material. 3. The axial gap according to claim 1, wherein the stator further includes a stator-side yoke that is provided on a surface opposite to a surface facing the rotor, and is formed of a magnetic material. Type generator. The axial gap generator according to claim 3, wherein the stator side yoke is a member formed by compression molding soft magnetic powder having an insulating film. The stator-side yoke is wound in a coil shape, the length of the strip-shaped electromagnetic soft iron or pure iron whose width in the coil axial direction is longer than the thickness in the coil radial direction, and the coil-shaped winding 4. The axial gap generator according to claim 3, wherein the axial gap generator is a single pancake structure member including an insulating member disposed between each turn in a band-shaped electromagnetic soft iron or pure iron. The axial gap generator according to claim 5, wherein the strip-shaped electromagnetic soft iron or pure iron has a thickness equal to or less than a skin depth corresponding to a power generation frequency. The said rotor is further equipped with the rotor side yoke formed from the magnetic body on the surface opposite to the surface which faces the said stator. The Claim 1 thru | or 6 characterized by the above-mentioned. Axial gap type generator. The axial gap generator according to any one of claims 1 to 7, wherein the strip-shaped conductor member has a thickness equal to or less than a skin depth corresponding to a power generation frequency. Further equipped with a sealable housing,
The stator is disposed in the housing;
The rotor is disposed outside the housing;
The casing portion interposed between the stator and the rotor is made of a non-magnetic and insulating material, or the skin depth corresponding to the power generation frequency is 10 times or more than the thickness of the casing portion. The axial gap generator according to any one of claims 1 to 8, wherein the generator is made of a material having a large resistance value. The axial gap generator according to claim 9, wherein the non-magnetic and insulating material further has a heat insulating property. The magnet is a permanent magnet,
When the W _PM and T _PM width in the rotational direction and a thickness in the magnet, respectively, the thickness of the coil and T _C, the distance between the facing surfaces of the said magnet coil and g, W _{PM / (T PM + T C +} g) axial gap dynamo according to any one of claims 1 to 10, characterized in that ≧ 1.5 flat condition is satisfied. The axial gap generator according to any one of claims 1 to 11, further comprising a core disposed in each core portion of each of the plurality of subcoils.

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