Coil device, power transmission system, and power transmission method

Abstract

To enable efficient power transmission or reception.SOLUTION: A coil device according to the present disclosure includes a power transmitting and receiving unit provided on one side of a wall of a magnetic body for transmitting and receiving power between the unit and a device provided on the other side of the wall, and a saturation magnetic flux generating unit provided on one side of the wall for magnetically saturating the wall, and the power transmitting and receiving unit includes a coil unit including a wound conductor and two magnetic action ends facing the wall, and the saturation magnetic flux generating unit includes two magnetic action ends facing the wall and positioned between the two magnetic action ends of the power transmitting and receiving unit.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a coil device, a power transmission system, and a power transmission method. [Background technology]

[0002] Patent Document 1 discloses technology related to a power supply device. This power supply device includes a power transmission unit and a power receiving unit. The power transmission unit has an iron core around which a primary coil is wound. The primary coil is supplied with AC power via a secondary cable. The power receiving unit has an iron core around which a secondary coil is wound. When power is transmitted from the power transmission unit to the power receiving unit, the end face of the iron core of the power transmission unit and the end face of the iron core of the power receiving unit are in close contact with each other. When AC power is supplied to the primary coil in the power transmission unit via the secondary cable, an induced electromotive force is generated in the secondary coil by electromagnetic induction, and power is supplied to the power receiving unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2-32721 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when transmitting power to underwater devices, in order to reduce the risk of water leakage at the point where the iron cores of the power transmitting unit and the power receiving unit come into contact, a contactless power transfer method that does not directly contact the iron cores is sometimes adopted. In contactless power transfer, the power transmitting unit and the power receiving unit are placed on either side of a wall, and an induced electromotive force is generated in the power receiving unit by the magnetic field generated by the power transmitting unit. However, if the wall is made of a magnetic material, magnetic flux is likely to be generated throughout the wall, which may make it difficult to generate magnetic flux from the power transmitting unit to the power receiving unit through the wall. This increases the amount of magnetic flux leakage during contactless power transfer from the power transmitting unit to the power receiving unit, which may make it difficult to efficiently transfer power to the power receiving unit.

[0005] The present disclosure describes a coil device, a power transmission system, and a power transmission method that are capable of efficiently transmitting or receiving power. [Means for solving the problem]

[0006] A coil device according to one embodiment of the present disclosure comprises a power transmitting and receiving unit provided on one side of a wall of a magnetic material for transmitting or receiving power between the unit and a device provided on the other side of the wall, and a saturation magnetic flux generating unit provided on one side of the wall for magnetically saturating the wall, wherein the power transmitting and receiving unit has a coil portion including a wound conductor and two magnetic action ends facing the wall, and the saturation magnetic flux generating unit has two magnetic action ends facing the wall and positioned between the two magnetic action ends of the power transmitting and receiving unit.

[0007] In the coil device disclosed herein, the two magnetically active ends of the saturated magnetic flux generator face a wall and are disposed between the two magnetically active ends of the power transmitting and receiving units. The wall is magnetically saturated by the magnetic field generated by the two magnetically active ends of the saturated magnetic flux generator. Because the portion of the wall between the two magnetically active ends of the power transmitting and receiving units is magnetically saturated, magnetic flux is less likely to flow directly from a portion of the wall facing one of the magnetically active ends of the power transmitting and receiving units to a portion of the wall facing the other magnetically active end of the power transmitting and receiving units. This minimizes the amount of magnetic flux leakage in the wall between the two magnetically active ends of the power transmitting and receiving units, allowing efficient generation of magnetic flux between the two magnetically active ends of the power transmitting and receiving units and a device located on the other side of the wall. The generation of magnetic flux can, for example, generate an induced electromotive force in the device, allowing the power transmitting and receiving units to transmit power to the device. Furthermore, the generation of magnetic flux can, for example, generate an induced electromotive force in the power transmitting and receiving units, allowing the power transmitting and receiving units to receive power. Therefore, this coil device can efficiently transmit or receive power in a contactless power supply.

[0008] In some embodiments, the conductor wire of the coil section of the power transmitting and receiving unit may form two openings facing the wall section as two magnetically active ends, and the saturated magnetic flux generating unit may have a saturated coil section including a conductor wire wound to form two openings facing the wall section as two magnetically active ends. For example, when a current flows through the conductor wire of the coil section, magnetic flux is generated from the opening of the coil section. This generates an induced electromotive force in a device provided on the other side of the wall section, allowing the coil section to transmit power to the device. For example, when a magnetic flux is generated in the opening of the coil section, induced electromotive force is generated in the coil section. This causes a current to flow in the conductor wire of the coil section, allowing the power transmitting and receiving unit to receive power. Furthermore, when a current flows through the conductor wire of the saturated coil section, magnetic flux is generated. This allows the saturated magnetic flux generating unit to magnetically saturate a portion of the wall section between the two magnetically active ends of the power transmitting and receiving unit.

[0009] In some embodiments, the saturated magnetic flux generating unit may have two magnets as the two magnetic force acting ends, respectively covering the two magnetic force acting ends of the power transmitting and receiving unit along the wall portion. The two magnets of the saturated magnetic flux generating unit can magnetically saturate a portion of the wall portion between the two magnetic force acting ends of the power transmitting and receiving unit. Furthermore, since the saturated magnetic flux generating unit does not need to be provided with a coil, costs can be reduced.

[0010] In some embodiments, the power transmitting and receiving unit may have a power transmitting and receiving core including two contacts facing the wall as two magnetically active ends, and the conductor of the coil unit may be wound around the power transmitting and receiving core. The saturation magnetic flux generating unit may include two contacts facing the wall as two magnetically active ends, a saturated core disposed between the two contacts of the power transmitting and receiving core, and a saturated coil unit including a conductor wound around the saturated core. In this case, even if the coil unit does not have two openings facing the wall, the power transmitting and receiving core having two contacts can generate magnetic flux between the power transmitting and receiving unit and a device provided on the other side of the wall. Even if the saturation coil unit does not have two openings facing the wall, the saturated core having two contacts can generate magnetic flux toward the wall. In this way, this coil device can reduce the amount of conductor used in the coil unit and the saturated coil unit.

[0011] In some embodiments, the power transmitting and receiving unit may have a power transmitting and receiving core including two contacts facing a wall portion as the two magnetically active ends, the saturated magnetic flux generating unit may have two contacts facing the wall portion as the two magnetically active ends and a saturated core disposed between the two contacts of the power transmitting and receiving core, and the coil unit of the power transmitting and receiving unit may be wound around both the power transmitting and receiving core and the saturated core. In this case, the number of power sources that supply current to the power transmitting and receiving unit and the saturated magnetic flux generating unit may be reduced. This may reduce the number of steps required to connect the power transmitting and receiving unit and the saturated magnetic flux generating unit to the power sources.

[0012] In some embodiments, the coil device may further include a DC power supply and an AC power supply electrically connected to the coil unit. In this case, by using a DC current component from the DC power supply in the saturation magnetic flux generating unit that magnetically saturates the wall unit, the magnetic flux generated in the wall unit between the two magnetically acting ends of the saturation magnetic flux generating unit becomes constant, and the saturation magnetic flux generating unit can efficiently magnetically saturate the wall unit between the two magnetically acting ends of the power transmitting and receiving unit. Furthermore, by using AC current from the AC power supply in the power transmitting and receiving unit, the strength of the magnetic field of the power transmitting and receiving unit changes over time. As a result, the power transmitting and receiving unit can generate an induced electromotive force in a device provided on the other side of the wall unit.

[0013] In some embodiments, at least one of the power transmitting / receiving core and the saturation core may be more magnetic than the wall portion. In this case, in the magnetic force generated on the wall portion from a device provided on the other side of the wall portion, the power transmitting / receiving core is more magnetic than the wall portion, which suppresses the generation of magnetic flux toward the wall portion outside the two magnetic force action ends of the power transmitting / receiving core, and makes it easier for magnetic flux to be generated toward the power transmitting / receiving core. Therefore, magnetic flux leakage to the wall portion is suppressed. Furthermore, the saturation core is more magnetic than the wall portion, which makes it easier for magnetic flux to be generated from one magnetic force action end of the saturation core to the other magnetic force action end via the wall portion, and makes it easier for magnetic flux to be generated toward the wall portion outside the two magnetic force action ends of the saturation core. Therefore, the saturation magnetic flux generating unit can be efficiently magnetically saturated at the wall portion.

[0014] In some embodiments, the saturated core may extend along the wall portion, and at least a portion of the saturated core may be located between the two magnetically active ends of the power transmitting and receiving units. In this case, the saturated core extending along the wall portion can magnetically saturate the wall portion in the range in which the saturated core extends. This can further suppress the generation of magnetic flux from one magnetically active end of the power transmitting and receiving units to the other magnetically active end through the wall portion.

[0015] In some embodiments, the coil device may further include a DC power supply electrically connected to the saturation coil section. In this case, by passing a DC current from the DC power supply through the saturation coil section that magnetically saturates the wall section, the magnetic flux generated in the wall section between the two magnetically acting ends of the saturated magnetic flux generating section becomes constant, and the saturated magnetic flux generating section can efficiently magnetically saturate a portion of the wall section between the two magnetically acting ends of the power transmitting and receiving section.

[0016] In some embodiments, the saturation magnetic flux generation unit may include two contacts facing the wall portion as two magnetically active ends, and a saturation core disposed between the two magnetically active ends of the power transmitting and receiving unit, with at least one of the two magnetically active ends of the saturation core being composed of a magnet. In this case, the magnetic force of the magnet can be used to magnetically saturate the wall portion, thereby reducing the power supplied to the saturation magnetic flux generation unit that generates the magnetic flux required for magnetic saturation. Furthermore, when the two magnetically active ends are composed of magnets, the saturation magnetic flux generation unit does not need to be provided with a coil, thereby reducing costs.

[0017] In some embodiments, at least one of the two magnetically acting ends of the saturated core may be formed of a variable magnetic force magnet. In this case, the magnetic flux generated by supplying current to the saturated coil section in the saturated magnetic flux generating section and the magnetic flux generated by magnetizing the variable magnetic force magnet act on the wall section, so that this coil device can efficiently magnetically saturate the wall section.

[0018] In some embodiments, the coil device may have two magnetically acting ends facing the wall portion, and may further include another saturated magnetic flux generator provided on one side of the wall portion to magnetically saturate the wall portion, with at least a portion of the power transmitting and receiving unit and the saturated magnetic flux generator being disposed between the two magnetically acting ends of the other saturated magnetic flux generator. In this case, the other saturated magnetic flux generator magnetically saturates the wall portion outside the two magnetically acting ends of the power transmitting and receiving unit, thereby suppressing the generation of magnetic flux in the power transmitting and receiving unit toward the outer wall portion and facilitating the generation of magnetic flux between the power transmitting and receiving unit and a device provided on the other side of the wall portion. This suppresses magnetic flux leakage into the wall portion.

[0019] A power transmission system according to one embodiment of the present disclosure includes a first coil device having a first power transmission / reception unit that is provided on one side of a wall portion of a magnetic material and is capable of transmitting or receiving power, and a saturation magnetic flux generating unit that is provided on one side of the wall portion and magnetically saturates the wall portion, and a second coil device that is provided on the other side of the wall portion and has a power transmission / reception unit that transmits or receives power between the first power transmission / reception unit, wherein the first power transmission / reception unit has a first coil unit including a wound conductor and two magnetic action ends facing the wall portion, and the second power transmission / reception unit has a second coil unit including a wound conductor and two magnetic action ends facing the wall portion, and the first power transmission / reception unit can be positioned opposite the two magnetic action ends of the second power transmission / reception unit across the wall portion, and the saturation magnetic flux generating unit may have two magnetic action ends facing the wall portion and positioned between the two magnetic action ends of the first power transmission / reception unit.

[0020] In the power transmission system of the present disclosure, the two magnetically active ends of the saturated magnetic flux generator face a wall and are disposed between the two magnetically active ends of the power transmitting and receiving units. The wall becomes magnetically saturated due to the magnetic field generated by the two magnetically active ends of the saturated magnetic flux generator. Because the portion of the wall between the two magnetically active ends of the first power transmitting and receiving unit is magnetically saturated, magnetic flux is less likely to flow directly from a portion of the wall facing one of the magnetically active ends of the first power transmitting and receiving unit to a portion of the wall facing the other magnetically active end of the first power transmitting and receiving unit. This minimizes the amount of magnetic flux leakage in the wall between the two magnetically active ends of the first power transmitting and receiving unit, allowing efficient generation of magnetic flux between the two magnetically active ends of the first power transmitting and receiving unit and a second power transmitting and receiving unit provided on the other side of the wall. The generation of magnetic flux generates, for example, an induced electromotive force in the second power transmitting and receiving unit, allowing the first power transmitting and receiving unit to transmit power to the second power transmitting and receiving unit. Furthermore, the generation of magnetic flux generates, for example, an induced electromotive force in the first power transmitting and receiving unit, and the first power transmitting and receiving unit receives power transmitted from the second power transmitting and receiving unit. Therefore, this power transmission system can transmit or receive power efficiently in a contactless power supply.

[0021] A power transmission method according to one embodiment of the present disclosure is a power transmission method for transmitting and receiving power between a first power transmission and receiving unit provided on one side of a wall portion of a magnetic material and a second power transmission and receiving unit provided on the other side of the wall portion, and includes the steps of generating a magnetic field in the wall portion and magnetically saturating a partial area of ​​the wall portion, and transmitting and receiving power between the first power transmission and receiving unit and the second power transmission and receiving unit by the first power transmission and receiving unit or the second power transmission and receiving unit generating a variable magnetic field in another area of ​​the wall portion between which the magnetically saturated partial area is sandwiched.

[0022] In the power transmission method disclosed herein, a magnetic field generated in the wall portion causes magnetic saturation in a portion of the wall portion. For example, by generating a fluctuating magnetic field in other regions sandwiching the magnetically saturated region of the first power transmitting / receiving unit, a state in which magnetic flux is less likely to be generated that travels directly from one end of the first power transmitting / receiving unit to the other end of the first power transmitting / receiving unit via the magnetically saturated region. Alternatively, for example, by generating a fluctuating magnetic field in other regions sandwiching the magnetically saturated region of the second power transmitting / receiving unit, a state in which magnetic flux is less likely to be generated that travels directly from one end of the second power transmitting / receiving unit to the other end of the second power transmitting / receiving unit via the magnetically saturated region. This reduces the amount of magnetic flux leakage in the magnetically saturated region of the wall portions of the first power transmitting / receiving unit and the second power transmitting / receiving unit, thereby efficiently generating a fluctuating magnetic field (magnetic flux) between the first power transmitting / receiving unit and the second power transmitting / receiving unit. The generation of the fluctuating magnetic field (magnetic flux) generates, for example, an induced electromotive force in the second power transmitting / receiving unit, allowing the first power transmitting / receiving unit to transmit power to the second power transmitting / receiving unit. Furthermore, the generation of magnetic flux generates an induced electromotive force in the first power transmitting and receiving unit, for example, and the first power transmitting and receiving unit receives power transmitted from the second power transmitting and receiving unit. Therefore, this power transmitting method enables efficient power transmission and reception in a contactless power supply. [Effects of the Invention]

[0023] According to some aspects of the present disclosure, a coil device, a power transmission system, and a power transmission method are provided that are capable of efficiently transmitting or receiving power in a contactless power supply. [Brief explanation of the drawings]

[0024] [Figure 1]FIG. 1 is a schematic configuration diagram showing an application example of a power transmission system according to an embodiment. [Figure 2] FIG. 2 is a perspective view of the water current power generation device shown in FIG. [Figure 3] 3 is a side view showing the power generation pod of the water current power generation device shown in FIG. 2. FIG. [Figure 4] FIG. 4 is a schematic side view illustrating an example of a power transmission system according to an embodiment. [Figure 5] FIG. 5 is a schematic plan view illustrating an example of a power transmission system according to an embodiment. [Figure 6] FIG. 6 is a conceptual diagram illustrating an example of magnetic resistance of a power transmission system according to an embodiment. [Figure 7] FIG. 7 is a schematic side view showing an example of a power transmission system according to a modified example. [Figure 8] FIG. 8 is a schematic side view showing an example of a power transmission system according to a modified example. [Figure 9] FIG. 9 is a schematic side view showing an example of a power transmission system according to a modified example. [Figure 10] FIG. 10 is a schematic side view showing an example of a power transmission system according to a modified example. [Figure 11] FIG. 11 is a graph showing an example of power transmitted to the power transmission system shown in FIG. [Figure 12] FIG. 12 is a schematic side view illustrating an example of a power transmission system according to a modified example. [Figure 13] FIG. 13 is a schematic side view showing an example of a power transmission system according to a modified example. [Figure 14] FIG. 14 is a schematic side view illustrating an example of a power transmission system according to a modified example. [Figure 15] FIG. 15 is a graph showing an example of the relationship between magnetic flux generated by the power transmission system shown in FIG. 14 and time. [Figure 16] FIG. 16 is a schematic side view illustrating an example of a power transmission system according to a modified example. [Figure 17] FIG. 17 is a graph showing an example of the relationship between magnetic flux generated by the power transmission system shown in FIG. 16 and time. [Figure 18] FIG. 18 is a schematic plan view illustrating an example of a power transmission system according to a modified example. [Figure 19] FIG. 19 is a schematic plan view illustrating an example of a power transmission system according to a modified example. [Figure 20] FIG. 20 is a schematic plan view illustrating an example of a power transmission system according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0025] An embodiment will be described below with reference to the drawings. In the description of the drawings, identical or corresponding elements are designated by the same reference numerals, and redundant description may be omitted. The dimensional proportions in the drawings do not necessarily correspond to those in the description.

[0026] 1 is a schematic diagram showing an application example of a power transmission system according to an embodiment. In the figure, the X-axis and Y-axis directions are horizontal directions, and the Z-axis direction is vertical directions. The X-axis, Y-axis, and Z-axis directions are mutually orthogonal axes in a Cartesian coordinate system in three-dimensional space. Hereinafter, the direction along the XY plane is also referred to as the horizontal direction, and the Z-axis direction is also referred to as the up-down direction.

[0027] As shown in FIG. 1, a water current power generation device 1 to which a power transmission system 100 is applied generates power by utilizing an ocean current FW. The water current power generation device 1 is, for example, a submersible floating power generation device that is installed and floats underwater. FIG. 2 is a perspective view of the water current power generation device shown in FIG. 1. As shown in FIG. 2, the water current power generation device 1 includes, for example, a pair of power generation pods 2 arranged spaced apart on the left and right, a central pod 3 arranged between the pair of power generation pods 2, and a cross beam 4 that is a connecting part that connects the pair of power generation pods 2 and the central pod 3.

[0028] FIG. 3 is a side view showing the power generation pod of the water current power generation device shown in FIG. 2. As shown in FIGS. 2 and 3, a power generation turbine 5 is provided in the rear part 2a of the power generation pod 2. The rear part 2a has, for example, a cylindrical shape. Hereinafter, the power generation turbine 5 will be referred to as the "turbine 5." The power generation pod 2 has, for example, a cylindrical shape and rotatably supports the turbine 5. A so-called downwind turbine is used as the turbine 5. However, the turbine 5 may also be an upwind turbine. The power generation pod 2 is equipped with a generator 9 (see FIG. 3) that generates electricity using the rotational driving force of the turbine 5.

[0029] Referring again to FIG. 1 , the water current power generation device 1 is connected to a sinker 6 installed on the bottom B via a mooring line 7. Note that instead of the sinker 6, the mooring line 7 may be connected to an anchor fixed to the bottom B. The upper end (one end) of the mooring line 7 is connected to the power generation pod 2, and the lower end (the other end) of the mooring line 7 is connected to the sinker 6. For example, one mooring line 7 is connected to each of a pair of power generation pods 2 (a total of two). Note that the upper end of the mooring line 7 may be connected to the cross beam 4. Furthermore, no depth-adjusting ropes or the like that would change the depth of the power generation pods 2, central pod 3, and cross beam 4 by, for example, adjusting the distance are connected to the power generation pods 2, central pod 3, and cross beam 4.

[0030] A power transmission cable 8 is also connected to the water current power generation device 1. The power transmission cable 8 is arranged along a mooring rope 7. One end of the power transmission cable 8 is connected to a generator 9 mounted on the power generation pod 2, and the other end of the power transmission cable 8 is connected to a repeater provided on the sinker 6, as shown in FIG. 4. The repeater includes a transformer. The repeater on the sinker 6 is connected to an underwater power transmission cable 10 that is laid on the bottom B and extends to the ground. This underwater power transmission cable 10 is connected to an onshore power system (external power source, etc.).

[0031] A communication cable 11 is also connected to the water current power generation device 1. The communication cable 11 is connected to electronic devices such as a control unit 19 mounted on the power generation pod 2. The communication cable 11 is arranged together with the power transmission cable 8 or the underwater power transmission cable 10. The communication cable 11 is connected to a control unit of an operation center located on land, for example.

[0032] Furthermore, in the water current power generation device 1, power transmitted from another power system can be supplied to the generator 9, and the generator 9 can be used as an electric motor. In the water current power generation device 1, the generator 9 can be driven as an electric motor to rotate the turbine 5. Furthermore, the water current power generation device 1 may be configured to include another electric motor to apply rotational force to the turbine 5.

[0033] The manner in which each cable is provided is not limited to the above. For example, a power transmission cable for transmitting the power generated by the generator 9 and a power transmission cable for transmitting the power to drive the electric motor may be provided separately. The repeater may be set on the bottom B outside the sinker 6.

[0034] 3, the turbine 5 includes a hub 13 and a plurality of (for example, two) blades 14 attached to the hub 13. The hub 13 is disposed at the rear end of the power generation pod 2. In a water current power generation device 1 employing a downwind turbine, the blades 14 are disposed downstream of the power generation pod 2 with respect to the direction of the ocean current FW.

[0035] The hub 13 is connected to a rotating shaft 15 and is rotatable about the axis. The hub 13 and the blades 14 rotate as a unit. The rotation of the blades 14 is transmitted to the generator 9 via the rotating shaft 15. The rotating shaft 15 is provided, for example, along the central axis of the power generation pod 2. When the generator 9 is driven as an electric motor, the rotation of the rotating shaft 15 causes the hub 13 and the blades 14 to rotate.

[0036] The cross beam 4 is a plate-like member including a hollow portion, and has a rectangular shape in a plan view. The cross beam 4 may have other shapes. For example, the cross beam can be formed by combining multiple cylindrical members.

[0037] In the water current power generation device 1, the pitch angle of the blades 14 is variable. The water current power generation device 1 is equipped with a blade pitch angle adjustment device 16 that can adjust the pitch angle of the blades 14. The blade pitch angle adjustment device 16 includes, for example, a hydraulic drive device 17 and a blade shaft 18. More specifically, the blade shaft 18 is provided at the base end of each blade 14. The drive device 17 is connected to the blade shaft 18. The drive device 17 is mounted, for example, inside the hub 13. The drive device 17 includes, for example, a gear mechanism. A known mechanism can be used as the drive device 17. The drive device 17 is controlled by a control unit 19 (described later) to rotate the blade shaft 18, thereby adjusting the pitch angle of the blades 14 to any angle. The drive method for the blade shaft 18 does not have to be hydraulic; an electric drive method using an electric motor or the like may also be used.

[0038] The water current power generation device 1 also includes a buoyancy adjustment device (not shown) and an attitude adjustment device (not shown) that adjusts the attitude of the float. The buoyancy adjustment device provided on the central pod 3 changes the weight of the entire water current power generation device 1 by, for example, injecting or discharging seawater between the central pod 3 and the outside. The float includes a pair of power generation pods 2, the central pod 3, and a cross beam 4. The attitude adjustment device changes the attitude (pitch angle) of the float by changing the center of gravity of the float. The pitch angle of the float can be defined as the angle of the axis L2 (Figure 3) of the power generation pod 2 with respect to a reference line extending horizontally. The axis L2 is an imaginary straight line extending in the direction in which the rotation axis 15 of the power generation pod 2 extends. 2, if an imaginary line extending in the longitudinal direction of the central pod 3 is defined as axis L3, an imaginary line extending in the direction in which the pair of power generation pods 2 move apart is defined as axis L4, and an imaginary line extending in the vertical direction is defined as axis L5, the pitch angle is the angle of rotation around axis L4. Axes L3 to L5 are perpendicular to one another.

[0039] The water current power generation device 1 includes a power source 12. The power source 12 is a battery. The power source 12 transmits electric power to the generator 9. This allows the generator 9 to operate as an electric motor and rotate the turbine 5.

[0040] The water current power generation device 1 includes a control unit 19. The control unit 19 is arranged, for example, inside the power generation pod 2. The control unit 19 may also be arranged inside the central pod 3. The control unit 19 is a computer configured with hardware such as a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory), and software such as a program stored in the ROM. The control unit 19 can also perform control of the water current power generation device 1 other than measuring the position of the float.

[0041] The control unit 19 transmits a signal. The control unit 19 transmits a signal related to the charging status of the power source 12. The control unit 19 transmits a signal related to the charging status of the power source 12 to, for example, a ship S on which the AC power source BA1 and the DC power source BA2 are loaded. The ship S has an external control unit CU that is capable of communicating with the control unit 19 and controls the power transmission of the AC power source BA1 and the DC power source BA2 (see FIG. 4). Note that, although the present embodiment shows an example in which the AC power source BA1 and the DC power source BA2 are loaded on the ship S, at least one of the AC power source BA1 and the DC power source BA2 may be provided on land.

[0042] The power transmission system 100 transmits power to the power source 12 of the water current power generator 1. The power transmission system 100 is a contactless power supply system in which a core that generates a magnetic field on the power transmission side and a core that generates a magnetic field on the power receiving side are not in direct contact with each other. The contactless power supply of this embodiment includes a case in which a core that generates a magnetic field on the power transmission side and a core that generates a magnetic field on the power receiving side are not in direct contact with each other. The contactless power supply of this embodiment also includes a case in which a core that generates a magnetic field on the power transmission side and a core that generates a magnetic field on the power receiving side are in indirect contact with each other via a wall portion.

[0043] The power transmission system 100 includes a coil device 200 and a power receiving device. The power receiving device in this embodiment is, for example, a power generation pod 2. The coil device 200 is configured to supply power to a power source 12 of the power generation pod 2, which is the power receiving device. The coil device 200 includes a housing 20, a first power transmitting and receiving module 30, and a saturated magnetic flux generating module 40. The first power transmitting and receiving module 30 is an example of a first power transmitting and receiving unit. The saturated magnetic flux generating module 40 is an example of a saturated magnetic flux generating unit. A rear portion 2a of the power generation pod 2, which is the power receiving device, includes a second power transmitting and receiving module 50. The second power transmitting and receiving module 50 is an example of a second power transmitting and receiving unit.

[0044] The first power transmitting and receiving module 30 and the second power transmitting and receiving module 50 housed in the power generation pod 2 are arranged within a predetermined distance, so that power can be transmitted and received between the first power transmitting and receiving module 30 and the second power transmitting and receiving module 50. In this embodiment, the first power transmitting and receiving module 30 performs a power transmitting function, and the second power transmitting and receiving module 50 performs a power receiving function, thereby supplying power to the power source 12 of the power generation pod 2.

[0045] The housing 20 houses the first power transmitting and receiving module 30 and the saturated magnetic flux generating module 40. For example, the housing 20 houses the first power transmitting and receiving module 30 and the saturated magnetic flux generating module 40 inside and covers the outside of the first power transmitting and receiving module 30 and the saturated magnetic flux generating module 40. The housing 20 ensures watertightness of the interior. This prevents the first power transmitting and receiving module 30 and the saturated magnetic flux generating module 40 from becoming waterlogged.

[0046] The housing 20 can be placed along the rear part 2a of the power generation pod 2. The housing 20 can be placed in contact with the rear part 2a of the power generation pod 2. The housing 20 can be placed within a predetermined distance from the rear part 2a of the power generation pod 2. In this embodiment, when supplying power to the power source 12 of the power generation pod 2, the housing 20 is placed in contact with the upper part (the part in the negative direction in the Z-axis direction) of the rear part 2a of the power generation pod 2 facing downward (the positive direction in the Z-axis direction).

[0047] A wall 21 is formed by the rear portion 2a of the power generation pod 2 and a part of the housing 20 that is in contact with or close to the rear portion 2a. When the rear portion 2a and the housing 20 of the power generation pod 2 are used underwater, the rear portion 2a and the housing 20 may each be made of a hard material so that the shapes of the rear portion 2a of the power generation pod 2 and the housing 20 are not changed by water pressure. The rear portion 2a and the housing 20 of the power generation pod 2 are made of, for example, a magnetic material. The rear portion 2a and the housing 20 of the power generation pod 2 are made of, for example, a metal containing iron.

[0048] The power transmission system 100 further includes a power transmission cable L that electrically connects the AC power supply BA1 and the DC power supply BA2 to the first power transmitting and receiving module 30 and the saturated magnetic flux generating module 40. The power transmission cable L transmits power from the AC power supply BA1 to the first power transmitting and receiving module 30 in the housing 20. The power transmission cable L transmits power from the DC power supply BA2 to the saturated magnetic flux generating module 40 in the housing 20. Note that the coil device 200 may be configured to include the AC power supply BA1, the DC power supply BA2, and the power transmission cable L.

[0049] Fig. 4 is a schematic side view showing an example of a power transmission system according to an embodiment. Fig. 5 is a schematic plan view showing an example of a power transmission system according to an embodiment. The first power transmission and reception module 30 shown in Figs. 4 and 5 is provided on one side of a wall 21 made of a magnetic material, and transmits or receives power between it and a device provided on the other side of the wall 21. The power receiving device is an example of a device provided on the other side of the wall 21. The first power transmission and reception module 30 of this embodiment is provided in a housing 20 on one side of the wall 21, and transmits power to a second power transmission and reception module 50 provided in a rear part 2a of a power generation pod 2 provided on the other side of the wall 21.

[0050] The first power transmitting and receiving module 30 has a first core 31 and a first coil portion 35. The first core 31 is an example of a power transmitting and receiving core. The first core 31 has higher magnetic properties than the wall portion 21, for example. The first core 31 is, for example, an iron core. The first core 31 extends along the Y axis, for example, and has a C-shape.

[0051] The first core 31 has a first core body 32 extending along the wall 21 and two magnetically active end portions 33, 34 facing the wall 21. The first core body 32 and the two magnetically active end portions 33, 34 each have, for example, a rectangular parallelepiped shape. The first core body 32 and the two magnetically active end portions 33, 34 may have, for example, a cylindrical shape or a prismatic shape with a polygonal cross section. The longitudinal direction of the first core body 32 is, for example, the Y-axis direction. The two magnetically active end portions 33, 34 protrude from, for example, both ends of the first core body 32. The two magnetically active end portions 33, 34 extend along the Z-axis. The two magnetically active end portions 33, 34 include, for example, two contact points facing the wall 21.

[0052] The first coil portion 35 includes a wound first coil conductor 36. The first coil portion 35 is an example of a coil portion. The first coil conductor 36 is wound around the first core 31. The first coil conductor 36 is wound around, for example, the first core body portion 32 of the first core 31. The first coil conductor 36 is connected to the AC power supply BA1 via the power transmission cable L. This allows an AC current to be applied to the first coil portion 35.

[0053] Next, the saturated magnetic flux generating module 40 will be described. The saturated magnetic flux generating module 40 is provided on one side of the wall 21 of the magnetic material and magnetically saturates the wall 21. The saturated magnetic flux generating module 40 of this embodiment is provided inside the housing 20 on one side of the wall 21 and magnetically saturates at least a portion of the region MFC of the wall 21 formed by a portion of the housing 20 and a portion of the rear portion 2a of the power generation pod 2. The region MFC is an example of a saturated magnetic flux region. Here, the portion of the housing 20 includes at least a portion between the magnetically active end 33 and the magnetically active end 34 of the first power transmitting and receiving module 30. The portion of the rear portion 2a of the power generation pod 2 includes at least a portion between the magnetically active end 53 and the magnetically active end 54 of the second power transmitting and receiving module 50.

[0054] The saturated magnetic flux generating module 40 includes a saturated core 41 and a saturated coil portion 45. The saturated core 41 has higher magnetic properties than the wall portion 21, for example. The saturated core 41 is, for example, an iron core. The saturated core 41 has, for example, a C-shape.

[0055] The saturated core 41 has a saturated core body 42 extending along the wall 21 and two magnetically active end portions 43, 44 facing the wall 21. The saturated core body 42 and the two magnetically active end portions 43, 44 each have, for example, a rectangular parallelepiped shape. The saturated core body 42 and the two magnetically active end portions 43, 44 may also have, for example, a cylindrical shape or a prismatic shape with a polygonal cross section.

[0056] If the saturation core 41 becomes magnetically saturated, the saturation magnetic flux generating module 40 cannot magnetically saturate the wall portion 21. For this reason, the material of the saturation core 41 is a material with a higher saturation magnetic flux density than the wall portion 21 (a material that is less likely to become magnetically saturated). In addition, the ratio of the magnetic path cross-sectional area of ​​the saturation core 41 is appropriately designed based on the material of the wall portion 21. By making the saturation core 41 have a higher saturation magnetic flux density and a larger magnetic path cross-sectional area than the wall portion 21, it is possible to prevent the saturation core 41 from becoming magnetically saturated and to preferentially magnetically saturate the wall portion 21.

[0057] The two magnetically active ends 43, 44, for example, protrude from both end portions of the saturated core body 42. The two magnetically active ends 43, 44 extend, for example, along the Z axis. The two magnetically active ends 43, 44 include, for example, two contact points facing the wall 21. The two magnetically active ends 43, 44 are disposed between the two magnetically active ends 33, 34 of the first power transmitting and receiving module 30.

[0058] A specific example of the arrangement of the two magnetic action ends 43, 44 of the saturated magnetic flux generating module 40 includes that at least a portion of each of the two magnetic action ends 43, 44 is arranged on a line segment connecting the two magnetic action ends 33, 34. On this line segment, the magnetic action end 33 of the first power transmitting and receiving module 30, the magnetic action end 43 of the saturated magnetic flux generating module 40, the magnetic action end 44 of the saturated magnetic flux generating module 40, and the magnetic action end 34 of the first power transmitting and receiving module 30 are arranged in this order. In the Z-axis direction, the distance between the two magnetic action ends 43, 44 of the saturated magnetic flux generating module 40 is shorter than the distance between the saturated core 41 and the first core 31. This reduces magnetic flux leakage from the saturated core 41 to the first core 31.

[0059] As shown in FIG. 5 , the saturated core 41 extends along the wall 21. The saturated core 41 extends along the wall 21 wider than the first core 31 or the first coil 35. The saturated core 41 extends, for example, in a direction intersecting the first core body 32 of the first core 31 and along the wall 21. The saturated core 41 of this embodiment extends, for example, along the X-axis direction, which is perpendicular to the first core body 32 of the first core 31. The longitudinal direction of the saturated core body 42 and the longitudinal direction of the two magnetically active end portions 43, 44 are, for example, the X-axis direction. In the X-axis direction, the saturated core 41 extends longer than the first core 31. That is, in the X-axis direction, the two magnetically active end portions 43, 44 extend longer than the two magnetically active end portions 33, 34. The distance of the saturated core 41 in the X-axis direction is longer than the distance of the first core 31 in the Y-axis direction.

[0060] The saturated coil section 45 includes a wound saturated coil conductor 46. The saturated coil section 45 is an example of a coil section. The saturated coil conductor 46 is wound around the saturated core 41. The saturated coil conductor 46 is wound, for example, around the saturated core main body 42 of the saturated core 41. The saturated coil conductor 46 is connected to a DC power supply BA2 via a power transmission cable L. This allows a DC current to be applied to the saturated coil section 45. The saturated coil conductor 46 may also be connected to an AC power supply BA1 via the power transmission cable L.

[0061] Next, the second power transmitting and receiving module 50 will be described. The second power transmitting and receiving module 50 is provided on the other side of the magnetic wall 21, and transmits and receives power between it and the first power transmitting and receiving module 30 provided on one side of the wall 21. The second power transmitting and receiving module 50 of this embodiment is provided in the rear part 2a of the power generation pod 2 on the other side of the wall 21, and receives power from the first power transmitting and receiving module 30 provided in the housing 20 provided on one side of the wall 21.

[0062] The second power transmitting and receiving module 50 has a second core 51 and a second coil portion 55. The second core 51 is an example of a power transmitting and receiving core. The second core 51 has a higher magnetic property than the wall portion 21, for example. The second core 51 is, for example, an iron core. The second core 51 has, for example, a C-shape.

[0063] The second core 51 has a second core body 52 extending along the wall 21 and two magnetically active end portions 53, 54 facing the wall 21. The second core body 52 and the two magnetically active end portions 53, 54 each have, for example, a rectangular parallelepiped shape. The second core body 52 and the two magnetically active end portions 53, 54 may have, for example, a cylindrical shape or a prismatic shape with a polygonal cross section. The longitudinal direction of the second core body 52 is, for example, the Y-axis direction. The two magnetically active end portions 53, 54 protrude from, for example, both ends of the second core body 52. ​​The two magnetically active end portions 33, 34 extend along the Z-axis. The two magnetically active end portions 53, 54 include, for example, two contact points facing the wall 21.

[0064] The second coil portion 55 includes a wound second coil conductor 56. The second coil portion 55 is an example of a coil portion. The second coil conductor 56 is wound around the second core 51. The second coil conductor 56 is wound around, for example, the second core body portion 52 of the second core 51. The second coil conductor 56 is connected to the power source 12 of the power generation pod 2 via the power transmission cable L.

[0065] The second power transmitting and receiving module 50 has a second core 51 and a second coil portion 55. The second core 51 is an example of a power transmitting and receiving core. The second core 51 has a higher magnetic property than the wall portion 21, for example. The second core 51 is, for example, an iron core. The second core 51 has, for example, a C-shape. The second core 51 has a second core body portion 52 extending along the wall portion 21 and two magnetically active end portions 53, 54 facing the wall portion 21. The two magnetically active end portions 53, 54 protrude, for example, from both end portions of the second core body portion 52. The two magnetically active end portions 53, 54 include, for example, two contact points facing the wall portion 21.

[0066] The second coil portion 55 includes a wound second coil conductor 56. The second coil portion 55 is an example of a coil portion. The second coil conductor 56 is wound around the second core 51. The second coil conductor 56 is wound around, for example, the second core body portion 52 of the second core 51. The second coil conductor 56 is connected to the power source 12 of the power generation pod 2.

[0067] Next, the relationship between magnetic resistance and electromotive force in the power transmission system 100 will be described. FIG. 6 is a conceptual diagram showing an example of magnetic resistance in a power transmission system according to one embodiment. As shown in FIG. 6, magnetic flux is generated in the first core 31, the saturated core 41, and the second core 51 by magnetomotive forces generated by the AC power source BA1 and the DC power source BA2. In the first core 31, the magnetic resistance of one portion extending from the AC power source BA1 and the DC power source BA2 toward the wall 21 is defined as R1, and the magnetic resistance of the other portion is defined as R2. In the saturated core 41, the magnetic resistance of one portion extending from the AC power source BA1 and the DC power source BA2 toward the wall 21 is defined as R8, and the magnetic resistance of the other portion is defined as R10. In the second core 51, the magnetic resistance of one portion extending from the center toward the wall 21 is defined as R3, the magnetic resistance of the center is defined as R4, and the magnetic resistance of the other portion extending from the center toward the wall 21 is defined as R5. In the wall portion 21, the magnetic resistance of an area MFA (see FIG. 4) where the magnetic action end 33 of the first core 31 faces the magnetic action end 53 of the second core 51 is R2, the magnetic resistance of an area MFB (see FIG. 4) where the magnetic action end 34 of the first core 31 faces the magnetic action end 54 of the second core 51 is R6, and the magnetic resistance of an area MFC (see FIG. 4) is R9. In the wall portion 21, the magnetic resistance of a portion between the areas MFA and MFC is R29, and the magnetic resistance of a portion between the areas MFB and MFC is R69.

[0068] Here, the route of the magnetic flux that travels from the first core 31 through the region MFA of the wall portion 21, the second core 51, and the region MFB of the wall portion 21 and returns to the first core 31 again is referred to as a main magnetic flux path CR1. Also, the route of the magnetic flux that travels from the saturable core 41 through the region MFC of the wall portion 21 and returns to the saturable core 41 again is referred to as a saturation magnetic flux path CR2 (see FIGS. 4 and 6).

[0069] In order to appropriately generate magnetic flux in the main magnetic flux path CR1 and to suppress the generation of magnetic flux returning from the first core 31 to the first core 31 via only the wall portion 21, the magnetic resistance of the main magnetic flux path CR1 needs to be smaller than the magnetic resistance of the wall portion 21. That is, in the relationship between the magnetic resistance of the main magnetic flux path CR1 and the magnetic resistance of the wall portion 21, a first condition may be satisfied, that is, the sum of the magnetic resistances R1, R2, R3, R4, R5, R6, and R7 of the main magnetic flux path CR1 is smaller than the sum of the magnetic resistances R29 and R69 of the regions MFA and MFB of the wall portion 21.

[0070] Furthermore, even if the first condition is not satisfied, the second condition may be satisfied, that is, in the relationship between the magnetic resistance of the main magnetic flux path CR1 and the magnetic resistance of the wall portion 21, the sum of the magnetic resistances R1, R2, R3, R4, R5, R6, and R7 of the main magnetic flux path CR1 is smaller than the sum of the magnetic resistances R29, R69, and R9 of the regions MFA, MFB, and MFC of the wall portion 21. Either the first condition or the second condition can suppress the generation of a magnetomotive force that passes from the magnetic action end 34 of the first core 31 through the wall portion 21 and returns to the first core 31 via the magnetic action end 33. Also, it can suppress the generation of a magnetomotive force (magnetic flux) that passes from the magnetic action end 54 of the second core 51 through the wall portion 21 and returns to the second core 51 via the magnetic action end 53.

[0071] When the first and second conditions are not satisfied, in order to appropriately generate magnetic flux in the main flux path CR1, suppress the generation of magnetic flux returning from the first core 31 via the wall portion 21 and the saturated core 41, and suppress the generation of magnetic flux returning from the second core 51 via the wall portion 21 and the saturated core 41, the magnetic reluctance of the main flux path CR1 may be smaller than the sum of the magnetic reluctance of the wall portion 21 and the magnetic reluctance of the saturated core 41. That is, in the relationship between the magnetic reluctance of the main flux path CR1, the magnetic reluctance of the wall portion 21, and the magnetic reluctance of the saturated core 41, a third condition may be satisfied, in which the sum of the magnetic reluctances R1, R2, R3, R4, R5, R6, and R7 of the main flux path CR1 is smaller than the sum of the magnetic reluctances R29, R69, R8, and R10 of the regions MFA and MFB of the wall portion 21 and the saturated core 41. This makes it possible to suppress the generation of a magnetomotive force that flows from the magnetically active end 34 of the first core 31 through the wall 21, through the saturated core 41 via the magnetically active end 44, through the wall 21 via the magnetically active end 43, and back to the first core 31 via the magnetically active end 33. It also makes it possible to suppress the generation of a magnetomotive force (magnetic flux) that flows from the magnetically active end 54 of the second core 51 through the wall 21, through the saturated core 41 via the magnetically active end 44, through the magnetically active end 43, and back to the second core 51 via the magnetically active end 53 described below.

[0072] Each magnetic resistance is a value obtained by dividing the distance between each portion of the first core 31, saturated core 41, second core 51, and wall portion 21 by the product of the magnetic permeability and the cross-sectional area of ​​the portion. Therefore, to satisfy the first, second, or third condition described above, the first core 31 and the second core 51 may be made of, for example, a material having higher magnetic properties than the wall portion 21 (high-magnetic material). To satisfy the first, second, or third condition described above, the first core 31 and the second core 51 may be made of, for example, a material having a larger cross-sectional area than the wall portion 21. To satisfy the first, second, or third condition described above, the first core 31 and the second core 51 may be configured to minimize the distance between each portion extending from the center of the first core 31 and the second core 51 toward the wall portion 21. The first core 31, saturated core 41, and second core 51 may be appropriately set based on, for example, the thickness and material of the wall portion 21.

[0073] Furthermore, since the saturated magnetic flux generating module 40 must magnetically saturate the region MFC (see FIG. 4) of the wall portion 21, it is necessary to prevent the magnetic flux generated by the saturated magnetic flux generating module 40 from flowing to portions other than the region MFC. That is, it is necessary to properly generate magnetic flux in the saturated magnetic flux magnetic path CR2, and to prevent magnetic flux from being generated from the saturated core 41 through the wall portion 21 in portions other than the region MFC (see FIG. 4) of the wall portion 21, such as the region MFA (see FIG. 4) and the region MFB (see FIG. 4) of the wall portion 21, the first core 31, and the second core 51.

[0074] Therefore, the wall portion 21 may satisfy a fourth condition that the magnetic resistance R9 of the region MFC of the wall portion 21 is smaller than the sum of the magnetic resistances R29 and R69 of the regions MFA and MFB of the wall portion 21. In this case, the generation of a magnetomotive force (magnetic flux) from the magnetic action end 43 of the saturated core 41 toward the region MFA or a magnetomotive force (magnetic flux) from the magnetic action end 44 of the saturated core 41 toward the region MFB is suppressed (see FIG. 4).

[0075] Here, as shown in the calculation formula of FIG. 6, there is no difference in magnetic permeability μ for each of the magnetic resistances R29, R69, and R9, and each of the magnetic resistances R29, R69, and R9 is determined by the cross-sectional area S of the wall portion 21. A , and the distances D1, D2, and D3 of the respective portions. A and is proportional to the distances D1, D2, and D3 of the respective portions. Therefore, as shown in FIG. 4, the saturated core 41 may be sufficiently separated from the first core 31, and the distance between the magnetically active ends 43 and 44 may be sufficiently short. The saturated core 41 and the first core 31 being sufficiently separated means, for example, that the distance D1 between the magnetically active ends 33 and 43 and the distance D2 between the magnetically active ends 34 and 44 in the Y-axis direction are equal to or greater than a predetermined distance. Furthermore, the distance D3 between the magnetically active ends 43 and 44 being sufficiently short means that the distance D3 between the magnetically active ends 43 and 44 is less than a predetermined distance. In this embodiment, the sum of the distance D1 and the distance D2 is greater than the distance D3. As a result, the sum of the magnetic resistance R29 between the magnetic force acting end 33 and the magnetic force acting end 43 and the magnetic resistance R69 between the magnetic force acting end 34 and the magnetic force acting end 44 becomes larger than the magnetic resistance R9 between the magnetic force acting end 43, 44. The cross-sectional area of ​​the region MFC of the wall portion 21 may be configured to be larger than the cross-sectional areas of the regions MFA and MFB of the wall portion 21.

[0076] Furthermore, in the saturated magnetic flux magnetic path CR2, a fifth condition may be satisfied, in which the sum of the magnetic resistances R8 and R10 of the saturated core 41 is smaller than the magnetic resistance R9 of the region MFC of the wall portion 21. In this case, the magnetic flux in the region MFC is more likely to return to the saturated core 41, and the generation of a magnetic flux from the region MFC toward the region MFA or a magnetomotive force (magnetic flux) from the region MFC toward the region MFB is suppressed (see FIG. 4). To satisfy the fifth condition, the saturated core 41 may be made of, for example, a material having higher magnetic properties than the wall portion 21 (highly magnetic material). To satisfy the fifth condition, the saturated core 41 may be made of, for example, a member having a larger cross-sectional area than the wall portion 21. To satisfy the fifth condition, the distance between each portion of the saturated core 41 extending from the center toward the wall portion 21 may be minimized.

[0077] As described above, by satisfying at least one of the first, second, and third conditions described above, a magnetomotive force (magnetic flux) is appropriately generated in the main magnetic flux magnetic path CR1, and power can be appropriately received between the first power transmitting and receiving module 30 and the second power transmitting and receiving module 50. Furthermore, by satisfying the fourth and fifth conditions, a magnetomotive force (magnetic flux) is appropriately generated in the saturated magnetic flux magnetic path CR2, and the region MFC of the wall portion 21 can be appropriately magnetically saturated.

[0078] Next, a method of transmitting and receiving power in the power transmission system 100 will be described. The control unit 19 acquires information about the charging status of the power source 12 from the power source 12 in the power generation pod 2. The information includes, for example, the ratio of the remaining charge amount of the power source 12 at the time the information about the charging status was acquired to the full charge of the power source 12. The control unit 19 determines whether charging of the power source 12 is necessary based on the information about the charging status. For example, the control unit 19 determines that charging of the power source 12 is necessary when the charge amount ratio included in the information about the charging status falls below a predetermined first threshold. This determination is performed at predetermined time intervals. If the control unit 19 determines that charging of the power source 12 is necessary, it transmits a first signal about the charging status to the external control unit CU. The first signal includes information requesting that charging is necessary.

[0079] The coil device 200, which is connected to the AC power source BA1 and the DC power source BA2 via the power transmission cable L, is disposed so as to be in contact with or spaced apart from the rear part 2a (power receiving device) of the power generation pod 2 by a predetermined distance. The coil device 200 of this embodiment is disposed so as to be in contact with the rear part 2a (power receiving device) of the power generation pod 2. The coil device 200 may be disposed on the rear part 2a of the power generation pod 2 by an operator, or may be disposed on the rear part 2a of the power generation pod 2 automatically by a robot. The coil device 200 is disposed so that the first power transmitting and receiving module 30 and the second power transmitting and receiving module 50 face each other with respect to the rear part 2a (power receiving device) of the power generation pod 2. For example, a highlighted region is provided outside the rear part 2a of the power generation pod 2 to indicate the position where the second power transmitting and receiving module 50 is provided on the rear part 2a (power receiving device) of the power generation pod 2. By arranging the housing 20 in the highlighted region, the first power transmitting and receiving module 30 and the second power transmitting and receiving module 50 are arranged in opposing positions.

[0080] After the coil device 200 is placed relative to the rear part 2a (power receiving device) of the power generation pod 2, the external control unit CU controls the DC power supply BA2 to send power from the DC power supply BA2 to the saturated magnetic flux generating module 40. When a current flows from the DC power supply BA2 to the saturated coil conductor 46, a magnetic field is generated by the saturated coil section 45. The saturated core 41 strengthens the magnetic field generated by the saturated coil section 45. The magnetic flux passes through the saturated core 41. A magnetic field (magnetic flux) directed toward the wall section 21 is generated at the magnetic action end 43 of the saturated core 41. A magnetic field (magnetic flux) directed from the magnetic action end 43 to the magnetic action end 44 via the wall section 21 is generated in the saturated core 41.

[0081] By generating a magnetic field in at least a portion of the region MFC of the wall portion 21 by the saturable core 41 for a predetermined time, at least a portion of the region MFC of the wall portion 21 is magnetized and magnetically saturated. That is, the magnetization strength in the region MFC reaches a maximum value and changes little with increasing magnetic field strength. In this way, the saturated magnetic flux generating module 40 can generate a magnetic field in the wall portion 21 and magnetically saturate a portion of the region MFC of the wall portion 21. In the horizontal direction, the region MFC includes, for example, the region between the two magnetically active ends 43 and 44. In the Z-axis direction, the region MFC is, for example, a region including the housing 20 and the rear portion 2a of the power generation pod 2. The region MFC may also include, for example, the region between the two magnetically active ends 33 and 34 and the region between the two magnetically active ends 53 and 54.

[0082] Simultaneously with, immediately after, or after a predetermined time has elapsed since the external control unit CU performed control to send power from the DC power supply BA2 to the saturated magnetic flux generating module 40, the external control unit CU controls the AC power supply BA1 to send power from the AC power supply BA1 to the first power transmitting and receiving module 30. In this embodiment, after a time estimated to have occurred when the region MFC is magnetically saturated has elapsed since the external control unit CU performed control to send power from the DC power supply BA2 to the saturated magnetic flux generating module 40, the external control unit CU controls the AC power supply BA1 to send power from the AC power supply BA1 to the first power transmitting and receiving module 30.

[0083] When a current flows from the AC power supply BA1 through the first coil conductor 36, a magnetic field is generated by the first coil unit 35. The first core 31 strengthens the magnetic field generated by the first coil unit 35. Magnetic flux passes through the first core 31. For example, during a predetermined first period when AC current is applied from the AC power supply BA1, a magnetic field H1 (magnetic flux) is generated in the magnetic action end 33 of the first core 31, and directed toward the magnetic action end 53 of the second power transmitting and receiving module 50 via the region MFA of the wall unit 21. The region MFA is a part of the wall unit 21 that faces the magnetic action end 33 and the magnetic action end 53.

[0084] A magnetic field generated by the magnetically active end 33 of the first core 31 is generated at the magnetically active end 53 of the second power transmitting and receiving module 50 through the region MFA of the wall 21. The magnetic field generated in the second core 51 causes a change in magnetic flux, resulting in electromagnetic induction in the second coil unit 55. A current is generated in the second coil conductor 56 of the second coil unit 55, thereby supplying power to the power source 12. The magnetic field in the second core 51 is generated in a direction from the magnetically active end 53 toward the magnetically active end 54 through the second core body 52. ​​A magnetic field (magnetic flux) H2 is generated from the magnetically active end 54 of the second core 51 toward the magnetically active end 34 of the first power transmitting and receiving module 30 through the region MFB of the wall 21. The region MFB is a part of the wall 21 that faces the magnetically active end 34 and the magnetically active end 54. As a result, the magnetic field in the first core 31 is generated in a direction from the magnetically active end 34 toward the magnetically active end 33 through the first core body 32.

[0085] For example, during a predetermined second period in which an alternating current is applied from the AC power supply BA1, a magnetic field (magnetic flux) is generated at the magnetic action end 34 of the first core 31, directed toward the magnetic action end 54 of the second power transmitting and receiving module 50 via the region MFB of the wall portion 21.

[0086] A magnetic field generated by the magnetically active end 34 of the first core 31 is generated at the magnetically active end 54 of the second power transmitting and receiving module 50 via the region MFB of the wall portion 21. A magnetic field is generated in the second core 51, causing a change in magnetic flux, which in turn causes electromagnetic induction in the second coil portion 55. A current is generated in the second coil conductor 56 of the second coil portion 55, thereby supplying power to the power source 12. The magnetic field in the second core 51 is generated in a direction from the magnetically active end 54 toward the magnetically active end 53 via the second core body portion 52. A magnetic field is generated from the magnetically active end 53 of the second core 51 toward the magnetically active end 33 of the first power transmitting and receiving module 30 via the region MFA of the wall portion 21, generating magnetic flux.

[0087] A magnetic field is generated in the magnetically active end 33 of the first core 31, directed from the magnetically active end 53 of the second power transmitting and receiving module 50 through the region MFA of the wall 21, generating a magnetic flux. As a result, the magnetic field in the first core 31 is generated in a direction from the magnetically active end 33 toward the magnetically active end 34 through the first core body 32. In this manner, the first power transmitting and receiving module 30 or the second power transmitting and receiving module 50 generates a fluctuating magnetic field in the regions MFA and MFB of the wall 21, which sandwich the magnetically saturated region MFC, thereby enabling power transmission and reception between the first power transmitting and receiving module and the second power transmitting and receiving module 50. In this embodiment, the first power transmitting and receiving module 30 generates a fluctuating magnetic field in the regions MFA and MFB of the wall 21, allowing the first power transmitting and receiving module 30 to transmit power to the second power transmitting and receiving module 50.

[0088] The control unit 19 acquires information about the charging status of the power source 12 from the power source 12 of the power generation pod 2. The control unit 19 determines whether charging of the power source 12 is necessary based on the information about the charging status. The control unit 19 determines that charging of the power source 12 is unnecessary (sufficient) when, for example, the percentage of the charged amount included in the information about the charging status exceeds a predetermined second threshold. This determination is performed at predetermined time intervals. When the percentage of the charged amount included in the information about the charging status is equal to or less than the predetermined second threshold, the control unit 19 continues transmitting power from the AC power source BA1 to the first power transmitting and receiving module 30, and therefore does not need to send a signal to the external control unit CU. When the control unit 19 determines that charging of the power source 12 is unnecessary, it sends a second signal about the charging status to the external control unit CU. The second signal includes information that charging is unnecessary. The coil device 200, which is connected to the AC power source BA1 via the power transmission cable L, is separated from the rear part 2a of the power generation pod 2. The coil device 200 may be moved away from the rear part 2a of the power-generating pod 2 by an operator, or may be moved away from the rear part 2a of the power-generating pod 2 automatically by a robot. This completes the power transmission to the power source 12 by the power transmission system 100.

[0089] Next, the effects achieved by the coil device 200, the power transmission system 100, and the power transmission method according to this embodiment will be described together with the problems with the related art.

[0090] In order to reduce the risk of water leakage at the point where a core generating a magnetic field on the power transmitting side and a core generating a magnetic field on the power receiving side come into contact, a contactless power transfer method that does not allow the cores to come into direct contact with each other is sometimes adopted, such as when transmitting power to an underwater device. When contactless power transfer is performed, the power transmitting side (hereinafter referred to as the power transmitting unit) and the power receiving side (hereinafter referred to as the power receiving unit) are arranged on either side of a wall, and the magnetic field generated by the power transmitting unit generates an induced electromotive force in the power receiving unit. However, compared to walls made of non-magnetic materials, walls made of magnetic material are more easily magnetized. Therefore, if the walls made of magnetic material are not magnetically saturated, magnetic flux is more likely to be generated throughout the wall, which may make it difficult for magnetic flux to be generated from the power transmitting unit to the power receiving unit via the wall.

[0091] For example, in the configuration of this embodiment, when power is transmitted, in the first power transmitting / receiving module 30, a magnetic field directed outward is generated at one of the magnetic action ends 33, 34, and a magnetic field directed inward (toward the first core body 32) is generated at the other magnetic action end. Furthermore, because the rear portion 2a of the power generation pod 2 and the housing 20 included in the wall portion 21 are made of a magnetic material, the wall portion 21 is more easily magnetized than a wall portion made of a non-magnetic material. Therefore, if the region MFC of the wall portion 21 is not magnetically saturated during the first period, it is considered that at least a portion H3 of the magnetic field generated in the region MFA is generated in the wall portion 21 in a direction from the region MFA to the region MFB via the region MFC. Furthermore, if the region MFC of the wall portion 21 is not magnetically saturated during the second period, it is considered that at least a portion H3 of the magnetic field generated in the region MFB is generated in the wall portion 21 in a direction from the region MFB to the region MFA via the region MFC. That is, when the region MFC of the wall portion 21 is not magnetically saturated, the magnetic field generated in the wall portion 21 may not be generated or may be generated only slightly in the second power transmitting and receiving module 50. As such, the amount of magnetic flux leakage during contactless power supply from the power transmitting unit to the power receiving unit increases, which may make it difficult to efficiently transmit power to the power receiving unit.

[0092] Furthermore, it is conceivable to construct the wall portion from a non-magnetic material to prevent magnetic flux from being generated in the wall portion. However, depending on the environment in which the device in which the power receiving unit is installed is used, constructing the wall portion from a non-magnetic material may be disadvantageous. For example, in an underwater device in which the power receiving unit is installed, it is necessary to prevent deformation and damage of the wall portion due to the influence of water pressure, so a highly rigid magnetic material may be used for the wall portion. Therefore, there has been a demand for a coil device and a power transmission system that can efficiently transmit or receive power in a contactless power supply even when the wall portion is made of a magnetic material.

[0093] In contrast to this, in the coil device 200, the power transmission system 100, and the power transmission method of this embodiment, the saturated magnetic flux generating module 40 of this embodiment can magnetically saturate the wall portion 21 with the magnetic field generated by the two magnetic action ends 43, 44. Since the portion of the wall portion 21 (region MFC) between the two magnetic action ends 33, 34 of the first power transmitting and receiving module 30 (an example of a power transmitting and receiving unit) is magnetically saturated, even if the magnetic field of the region MFA or the region MFB is strengthened by the first power transmitting and receiving module 30, the magnetization of the region MFC remains almost unchanged.

[0094] This results in a state in which magnetic flux is less likely to be generated directly from a portion (region MFA) of the wall 21 facing one magnetically acting end 33 of the first power transmitting and receiving module 30 to a portion (region MFB) of the wall 21 facing the other magnetically acting end 34 via the wall 21. Similarly, this results in a state in which magnetic flux is less likely to be generated directly from a portion (region MFB) of the wall 21 facing one magnetically acting end 34 of the first power transmitting and receiving module 30 to a portion (region MFA) of the wall 21 facing the other magnetically acting end 33 via the wall 21. This makes it possible to keep the amount of magnetic flux leakage in the wall 21 between the two magnetically acting ends 33, 34 of the first power transmitting and receiving module 30 small.

[0095] Furthermore, a magnetic flux (variable magnetic field) can be efficiently generated between the two magnetically active ends 33, 34 of the first power transmitting and receiving module 30 and the second power transmitting and receiving module 50 of the power generating pod 2, which is a device provided on the other side (positive direction of the Z axis) of the wall portion 21. That is, in the first period, a magnetic field is easily formed from one magnetically active end 33 of the first power transmitting and receiving module 30 toward one magnetically active end 53 of the second power transmitting and receiving module 50 via the region MFA of the wall portion 21. In the first period, a magnetic field is easily formed from the other magnetically active end 54 of the second power transmitting and receiving module 50 toward the other magnetically active end 34 of the first power transmitting and receiving module 30 via the region MFB of the wall portion 21. In addition, in the second period, a magnetic field is easily formed from the other magnetically active end 34 of the first power transmitting and receiving module 30 toward the other magnetically active end 54 of the second power transmitting and receiving module 50 via the region MFB of the wall portion 21. In the second period, a magnetic field is likely to be formed that flows from one magnetically acting end 53 of the second power transmitting and receiving module 50 toward one magnetically acting end 33 of the first power transmitting and receiving module 30 via the region MFA of the wall portion 21. In this way, the generation of magnetic flux in the second power transmitting and receiving module 50 generates an induced electromotive force in, for example, the second power transmitting and receiving module 50 in the rear portion 2a of the power generating pod 2, and the first power transmitting and receiving module 30 can transmit power to the power source 12 of the power generating pod 2. Therefore, the coil device 200 and the power transmitting system 100 can transmit power efficiently in a contactless power supply.

[0096] In the present embodiment, even if the first coil section 35 does not have two openings formed to face the wall section 21, the first core 31 has two contacts, so that a magnetic flux can be generated between the first power transmitting and receiving module 30 and a device (second power transmitting and receiving module 50) provided on the other side of the wall section 21. Even if the saturating coil section 45 does not have two openings formed to face the wall section 21, the saturating core 41 has two contacts, so that a magnetic flux can be generated toward the wall section 21. In this way, the coil device 200 can reduce the amount of wire used for the first coil section 35 and the saturating coil section 45 compared to when the first coil section 35 has two openings formed to face the wall section 21 and when the saturating coil section 45 has two openings formed to face the wall section 21.

[0097] In this embodiment, in the magnetic force generated on the wall 21 from a device (second power transmitting and receiving module 50) provided on the other side of the wall 21, the first core 31 has a higher magnetic property than the wall 21, which suppresses the generation of magnetic flux toward the wall 21 outside the two magnetically active ends 33, 34 of the first core 31 and makes it easier for magnetic flux to be generated toward the first core 31. Therefore, magnetic flux leakage to the wall 21 is suppressed. Furthermore, the saturated core 41 has a higher magnetic property than the wall 21, which makes it easier for magnetic flux to be generated from one magnetically active end 43 of the saturated core 41 to the other magnetically active end 44 via the wall 21 and makes it easier for magnetic flux to be generated toward the wall outside the two magnetically active ends 43, 44 of the saturated core 41. Therefore, the saturated magnetic flux generating module 40 can be magnetically saturated efficiently at the wall 21.

[0098] In the present embodiment, the saturated core 41 extends along the wall 21, and at least a portion of the saturated core 41 is located between the two magnetically active ends 33, 34 of the first power transmitting and receiving module 30. In this case, since the saturated core 41 extends along the wall 21, the wall 21 can be magnetically saturated in the range in which the saturated core 41 extends. This further suppresses the generation of magnetic flux from one magnetically active end 33 to the other magnetically active end 34 of the first power transmitting and receiving module 30 through the wall 21 (or from the magnetically active end 34 to the other magnetically active end 33). In other words, the saturated magnetic flux generating module 40 can reduce magnetic flux leakage in the first power transmitting and receiving module 30. The coil device may further include a DC power supply electrically connected to the saturated coil unit. In this case, by passing a DC current from a DC power source through the saturation coil section that magnetically saturates the wall section, the magnetic flux generated in the wall section between the two magnetic action ends of the saturated magnetic flux module becomes constant, and the saturated magnetic flux module can efficiently magnetically saturate a portion of the wall section between the two magnetic action ends of the power transmitting and receiving section.

[0099] The coil device 200 of this embodiment is disposed so as to be in contact with the rear part 2a (power receiving device) of the power generation pod 2. When the power generation pod 2 is disposed in the sea and the coil device 200 is disposed away from the rear part 2a of the power generation pod 2, generating magnetic flux, eddy currents may be generated in the seawater located between the coil device 200 and the power generation pod 2, generating a magnetomotive force in the direction opposite to the magnetic flux direction. This reduces the magnetic flux from the first power transmitting and receiving module 30 to the second power transmitting and receiving module 50, or the magnetic flux from the second power transmitting and receiving module 50 to the first power transmitting and receiving module 30. By disposing the coil device 200 of this embodiment so as to be in contact with the rear part 2a of the power generation pod 2, the possibility of the magnetic flux being reduced as described above can be reduced.

[0100] The coil device 200 and the power transmission system 100 of the present disclosure are not limited to the above-described embodiment. The coil device 200 and the power transmission system 100 of the present disclosure may be modified in specific aspects as appropriate within the scope of the claims.

[0101] For example, the target to which the power transmission system 100 transmits power is not limited to the water current power generation device 1. The target to which the power transmission system 100 transmits power may be a device located on land, a device located on water, or a device located in the air.

[0102] For example, the saturated magnetic flux generating module 40 may be provided on the other side of the wall portion 21. For example, the saturated magnetic flux generating module 40 may be provided inside the power generation pod 2. In this case, the saturated magnetic flux generating module 40 has two magnetically acting ends that are arranged horizontally between the two magnetically acting ends 53, 54 of the second power transmitting and receiving module 50. That is, the two magnetically acting ends of the saturated magnetic flux generating module 40 protrude from the saturated core main body 42 in the negative direction of the Z axis. The saturated magnetic flux generating module 40 may transmit power from the generator 9 or the power source 12. The coil device 200 may be a power receiving device that does not have a first power transmitting and receiving module 30 that has a power transmitting function, and that includes the saturated magnetic flux generating module 40 and the second power transmitting and receiving module 50.

[0103] <First Modification> Fig. 7 is a schematic side view showing an example of a power transmission system according to a modified example. In the power transmission system 100A and the coil device 200A shown in Fig. 7, the first coil conductor 36A of the first coil section 35A of the first power transmitting and receiving module 30A forms two openings facing the wall section 21 as two magnetically acting end sections 33A, 34A. The power transmission system 100A and the coil device 200A differ from the power transmission system 100 and the coil device 200 of the embodiment in that the first power transmitting and receiving module 30A does not have a first core 31 (power transmitting and receiving core) and that the first coil section 35A forms two openings as two magnetically acting end sections 33A, 34A.

[0104] 7, a saturated magnetic flux generating module 40A has a saturated coil section 45A including a saturated coil conductor 46A wound so as to form two openings facing the wall section 21 as two magnetic force action ends 43A, 44A. The power transmission system 100A and the coil device 200A differ from the power transmission system 100 and the coil device 200 of the embodiment in that the saturated magnetic flux generating module 40A does not have a saturated core 41 and that the saturated coil section 45A forms two openings as the two magnetic force action ends 43A, 44A.

[0105] 7, the second coil conductor 56A of the second coil section 55A of the second power transmitting and receiving module 50A forms two openings as two magnetically acting ends 53A, 54A facing the wall section 21. The power transmitting system 100A and the coil device 200A differ from the power transmitting system 100 and the coil device 200 of the embodiment in that the second power transmitting and receiving module 50A does not have a second core 51 and the second coil section 55A forms two openings as two magnetically acting ends 53A, 54A.

[0106] When a current flows through the first coil conductor 36A of the first coil section 35A, a magnetic flux is generated from the opening (magnetic action ends 33A, 34A) of the first coil section 35A. This generates an induced electromotive force in a device (second power transmitting and receiving module 50A) provided on the other side of the wall section 21, and the first coil section 35A can transmit power to the power source 12 of the power generation pod 2. For example, when a magnetic flux is generated at the opening of the first coil section 35A, an induced electromotive force is generated in the first coil section 35A. This causes a current to flow through the first coil conductor 36A of the first coil section 35A, and the first power transmitting and receiving module 30A can receive power. Furthermore, a magnetic flux is generated when a current flows through the saturation coil conductor 46A of the saturation coil section 45A. This allows the saturation magnetic flux generating module 40A to magnetically saturate a portion (region MFC) of the wall section 21 between the two magnetic action ends 33, 34 of the first power transmitting and receiving module 30.

[0107] Thus, in the power transmission system 100A and the coil device 200A, the first power transmitting and receiving module 30 does not have the first core 31, and the saturated magnetic flux generating module 40 does not have the saturated core 41. In the power transmission system 100A, the second power transmitting and receiving module 50 does not have the second core 51. As a result, since the first core 31, saturated core 41, and second core 51 are not provided, the weight of the power transmission system 100A and the coil device 200A can be reduced.

[0108] In the power transmission system 100A and the coil device 200A, a configuration with a core and a configuration without a core may be combined among the first power transmitting and receiving module 30, the saturated magnetic flux generating module 40, and the second power transmitting and receiving module 50. That is, when at least one of the saturated magnetic flux generating module 40A and the second power transmitting and receiving module 50A does not have a core (the saturated core 41 and the second core 51), the first power transmitting and receiving module 30A may have the first core 31 like the first power transmitting and receiving module 30 of the embodiment. When at least one of the first power transmitting and receiving module 30A and the saturated magnetic flux generating module 40A does not have a core (the first core 31 and the saturated core 41), the second power transmitting and receiving module 50A may have the second core 51 like the second power transmitting and receiving module 50 of the embodiment. If at least one of the first power transmission and reception module 30A and the second power transmission and reception module 50A does not have a core (first core 31 and second core 51), the saturated magnetic flux generating module 40A may have a saturated core 41 like the saturated magnetic flux generating module 40 of the embodiment.

[0109] <Second Modification> Fig. 8 is a schematic side view showing an example of a power transmission system according to a modified example. In a power transmission system 100B and a coil device 200B shown in Fig. 8, a first coil section 35B of a first power transmitting and receiving module 30B and a saturated coil section 45B of a saturated magnetic flux generating module 40 are connected in parallel to an AC power supply BA1. The power transmission system 100 and the coil device 200 of the embodiment differ from each other in that the first coil section 35B of the first power transmitting and receiving module 30B is connected to the AC power supply BA1 and the saturated coil section 45 of the saturated magnetic flux generating module 40 is connected to a DC power supply BA2.

[0110] As described above, the power transmission system 100B and the coil device 200B do not necessarily need to include either the AC power supply BA1 or the DC power supply BA2. The first coil section 35B of the first power transmitting and receiving module 30B and the saturation coil section 45 of the saturation magnetic flux generating module 40 may be connected in series to the AC power supply BA1 or the DC power supply BA2. The external control unit CU may control the power from each of the AC power supply BA1 and the DC power supply BA2 so that an AC voltage and a DC voltage are superimposed and supplied to the first coil section 35B and the saturation coil section 45B.

[0111] <Third Modification> Fig. 9 is a schematic side view showing an example of a power transmission system according to a modified example. In the power transmission system 100C and coil device 200C shown in Fig. 9, a saturated coil conductor 46C of a saturated coil section 45C of a saturated magnetic flux generating module 40C is connected midway through a spiral-shaped first coil conductor 36C constituting a first coil section 35C of a first power transmitting and receiving module 30C. The power transmission system 100C and the coil device 200C differ from those of the embodiment in that the first coil section 35C of the first power transmitting and receiving module 30B is connected to an AC power supply BA1 and the saturated coil section 45 of the saturated magnetic flux generating module 40C is connected to a DC power supply BA2.

[0112] In this way, in the power transmission system 100C and the coil device 200C, the first coil section 35 and the saturated coil section 45 may be shunt wound. In the power transmission system 100C and the coil device 200C, either the AC power supply BA1 or the DC power supply BA2 does not have to be provided. Note that at least one of the first coil section 35C, the saturated coil section 45C, and the second coil section 55C may have multiple coils. In the power transmission system 100C and the coil device 200C, either the AC power supply BA1 or the DC power supply BA2 does not have to be provided.

[0113] <Fourth Modification> 10 is a schematic side view showing an example of a power transmission system according to a modified example. In a power transmission system 100D and a coil device 200D shown in FIG. 10, a first coil section 35D of a first power transmitting and receiving module 30D is wound around both the first core 31 and the saturated core 41, and a saturated magnetic flux generating module 40D does not have a saturated coil section 45. This is different from the power transmission system 100 and the coil device 200 of the embodiment. The size of the surface of the magnetically active ends 33 and 34 of the first core 31 facing the wall 21 is larger than the size of the surface of the magnetically active ends 43 and 44 of the saturated core 41 facing the wall 21. As a result, even when the same power is transmitted to the first power transmitting and receiving module 30 and the saturated magnetic flux generating module 40, the magnetic flux density at the magnetically active ends 33 and 34 is smaller than the magnetic flux density at the magnetically active ends 43 and 44 of the saturated core 41. Therefore, the first power transmitting and receiving module 30 for transmitting and receiving power prevents the wall portion 21 from becoming magnetically saturated, enabling appropriate power transmission and reception. Also, the first core 31 and the saturated core 41 are disposed within the opening of the first coil portion 35D.

[0114] Fig. 11 is a graph showing an example of power transmitted to the power transmission system shown in Fig. 10. As shown in Fig. 11, the external control unit CU may control power from each of the AC power supply BA1 and the DC power supply BA2 so that an AC voltage and a DC voltage are superimposed and supplied to the first coil unit 35D. The external control unit CU controls the AC power supply BA1 and the DC power supply BA2 so that the first coil unit 35 generates a magnetic flux in the first core 31 that can supply power to the second power transmitting and receiving module 50, and so that the first coil unit 35 magnetically saturates the wall unit 21 with respect to the saturation core 41.

[0115] For example, among the superimposed powers supplied, the AC component passing through the first coil portion 35D generates a magnetic field in the first core 31. This generates a magnetic field in the second core 51, causing electromagnetic induction in the second coil portion 55. Note that the DC component passing through the first coil portion 35D also generates a magnetic field in the first core 31, but does not contribute to electromagnetic induction in the second core 51. To suppress magnetic saturation in the regions MFA and MFB and appropriately generate electromagnetic induction, the cross-sectional areas of the magnetically active ends 33, 34 of the first core 31 and the magnetically active ends 53, 54 of the second core 51 facing the wall portion 21 are set to be sufficiently large. The cross-sectional areas of the magnetically active ends 33, 34 of the first core 31 and the magnetically active ends 53, 54 of the second core 51 facing the wall portion 21 are larger than the cross-sectional areas of the magnetically active ends 43, 44 of the saturation core 41, for example.

[0116] Furthermore, for example, among the superimposed power components, the AC and DC components passing through the first coil portion 35D generate a magnetic field in the saturable core 41. Although the DC component inhibits the magnetic field generated by the AC component for half a cycle of one AC component, the magnetic field generated by the DC component is generated at a constant intensity, thereby biasing the direction of the magnetic field generated by the superimposed power components. As a result, the saturable core 41 can magnetize the wall portion 21 until the wall portion 21 is magnetically saturated during one cycle of the AC component. To promote magnetic saturation in the region MFC, the cross-sectional areas of the magnetically active ends 43 and 44 of the saturable core 41 facing the wall portion 21 may be set small enough to allow magnetic saturation of the wall portion 21 before the saturable core 41 is magnetically saturated. The cross-sectional areas of the magnetically active ends 43 and 44 of the saturable core 41 facing the wall portion 21 may be smaller than the cross-sectional areas of the magnetically active ends 33 and 34 of the first core 31 and the magnetically active ends 53 and 54 of the second core 51, for example.

[0117] Here, if the frequency of the AC component generated by the saturable core 41 is high, a demagnetizing field may be generated in the wall portion 21. Therefore, in order to suppress the generation of a demagnetizing field while magnetically saturating the wall portion 21, the AC component of the superimposed power supplied that passes through the first coil portion 35D has a lower frequency than the power supplied by the AC power supply BA1 of the embodiment. Also, in order to suppress the generation of a demagnetizing field while magnetically saturating the wall portion 21, the contribution of the DC component of the superimposed power supplied that passes through the first coil portion 35D is adjusted to be large.

[0118] In this way, the power transmission system 100D and the coil device 200D can transmit or receive power efficiently even when the first coil portion 35D of the first power transmitting and receiving module 30D is wound around both the first core 31 and the saturated core 41. Furthermore, since there is no need to provide the saturated coil portion 45 for the saturated core 41, the number of steps required to manufacture the saturated magnetic flux generating module 40 can be reduced.

[0119] The external control unit CU does not have to control the power from each of the AC power supply BA1 and the DC power supply BA2 so that an AC voltage and a DC voltage are superimposed and supplied to the first coil unit 35D. In this case, for example, the external control unit CU may control the power from the AC power supply BA1 so that an AC voltage is supplied to the first coil unit 35D. In this case, the external control unit CU controls the AC power supply BA1 so that the first coil unit 35D generates a magnetic flux in the first core 31 that can supply power to the second power transmitting and receiving module 50, and so that the first coil unit 35D magnetically saturates the wall unit 21 with respect to the saturation core 41. In this case, the DC power supply BA2 is not required as a power source for transmitting power to the coil device 200D, thereby reducing the number of steps required to install a power supply on the ship S, etc., and to connect the conductors.

[0120] <Fourth Modification> Fig. 12 is a schematic side view showing an example of a power transmission system according to a modified example. The power transmission system 100E and the coil device 200E shown in Fig. 12 differ from the power transmission system 100 and the coil device 200 of the embodiment in that a saturated magnetic flux generating module 40E has two magnets as two magnetic action ends 43E, 44E that respectively cover the two magnetic action ends 33, 34 of the first power transmitting and receiving module 30 along the wall 21. That is, the saturated magnetic flux generating module 40E does not have a saturated core 41 or a saturated coil section 45. The magnetic action ends 43E, 44E are, for example, permanent magnets. The size of the permanent magnets and the magnitude of the magnetic force are designed based on the thickness of the wall 21.

[0121] The magnetically active end 43E covers the periphery of the magnetically active end 33 of the first core 31. For example, the magnetically active end 43E covers at least the portion of the magnetically active end 33 that faces the magnetically active end 34 (the portion on the negative side of the Y-axis). For example, the magnetically active end 43E covers the entire periphery of the magnetically active end 33 of the first core 31 in the horizontal direction. In the Z-axis direction, the magnetically active end 33 of the first core 31 is exposed to the wall portion 21 from an opening formed by the magnetically active end 43E.

[0122] The magnetically active end 44E covers the periphery of the magnetically active end 34 of the first core 31. For example, the magnetically active end 44E covers at least the portion of the magnetically active end 34 that faces the magnetically active end 33 (the portion on the positive side of the Y-axis). For example, the magnetically active end 44E covers the entire periphery of the magnetically active end 34 of the first core 31 in the horizontal direction. In the Z-axis direction, the magnetically active end 34 of the first core 31 is exposed to the wall portion 21 from an opening formed by the magnetically active end 44E.

[0123] The two magnets (magnetic force acting ends 43E, 44E) of the saturated magnetic flux generating module 40E can magnetically saturate an area MFC, which is a part of the wall portion 21 between the two magnetic force acting ends 33, 34 of the first power transmitting and receiving module 30. Furthermore, the saturated magnetic flux generating module 40 does not require a coil and a core (iron core), thereby reducing costs. Furthermore, in the power transmitting system 100E and the coil device 200E, the saturated magnetic flux generating module 40E does not require power, so it is not necessary to provide either the AC power supply BA1 or the DC power supply BA2 that supplies power to the saturated magnetic flux generating module 40. As a result, the power transmitting system 100E and the coil device 200E can reduce the man-hours required to install the power supplies.

[0124] The magnetic action end 43E may cover the magnetic action end 33A of the first coil section 35A in the first modification. The magnetic action end 44E may cover the magnetic action end 34A of the first coil section 35A in the first modification. The power transmission system 100A and the coil device 200A may not have the saturation coil section 45A of the saturation magnetic flux generating module 40A. The saturation magnetic flux generating module 40E may have only one of the magnetic action end sections 43E and 44E. That is, the saturation magnetic flux generating module 40E may have a magnet that covers at least one of the two magnetic action end sections 33 and 34 of the first power transmitting and receiving module 30 along the wall section 21. In this case, the saturation magnetic flux generating module 40E magnetically saturates the region MFC of the wall section 21 with one magnet. In this case, the size of the permanent magnet and the magnitude of the magnetic force are designed to be larger than when two magnets are provided.

[0125] <Fifth Modification> FIG. 13 is a schematic side view showing an example of a power transmission system according to a modification. In the power transmission system 100F and coil device 200F shown in FIG. 13, the saturated magnetic flux generating module 40F includes two contacts facing the wall portion 21 as two magnetically active ends 43F, 44F, and has a saturated core 41 disposed between the two magnetically active ends 33, 34 of the first power transmitting / receiving module 30, and at least one of the two magnetically active ends 43F, 44F of the saturated core 41 is configured with a magnet. The saturated magnetic flux generating module 40F differs from the power transmission system 100 and coil device 200 of the embodiment in that it does not have a saturated coil portion 45. In the fifth modification shown in FIG. 13, the magnetically active ends 43F, 44F of the saturated core 41 are, for example, permanent magnets. The size and magnetic force of the permanent magnet are designed based on the thickness of the wall portion 21. The saturated core 41 may be entirely magnetized.

[0126] The magnets provided at the magnetic action ends 43F, 44F of the saturated magnetic flux generating module 40F can magnetically saturate the region MFC, which is a part of the wall portion 21 between the two magnetic action ends 33, 34 of the first power transmitting and receiving module 30. Furthermore, the saturated magnetic flux generating module 40 does not require a coil, thereby reducing costs. Furthermore, in the power transmission system 100F and the coil device 200F, the saturated magnetic flux generating module 40F does not require power, so either the AC power supply BA1 or the DC power supply BA2 that supplies power to the saturated magnetic flux generating module 40 does not need to be provided. This allows the power transmission system 100F and the coil device 200F to reduce the man-hours required to install the power supplies. The magnetic action end 43F does not need to be composed of a magnet. The magnetic action end 44F does not need to be composed of a magnet.

[0127] <Sixth Modification> Fig. 14 is a schematic side view showing an example of a power transmission system according to a modified example. In a power transmission system 100G and a coil device 200G shown in Fig. 14, at least one of the two magnetic action ends of the saturated core 41 of a saturated magnetic flux generating module 40G may be configured with a variable magnetic force magnet. In the example shown in Fig. 14, in the saturated magnetic flux generating module 40G, the two magnetic action ends 43G of the saturated core 41 are configured with variable magnetic force magnets. This differs from the power transmission system 100 and the coil device 200 of the embodiment in that the magnetic action end 43G is configured with a variable magnetic force magnet.

[0128] Fig. 15 is a graph showing an example of the relationship between time and magnetic flux generated by the power transmission system shown in Fig. 14. (a) of Fig. 15 is a graph showing an example of the relationship between time and magnetic flux generated by the first coil unit of the power transmission system shown in Fig. 14. As shown in (a) of Fig. 15, the magnetic flux generated in the first coil unit 35 changes periodically. The external control unit CU controls the power from the AC power supply BA1 so that an AC voltage is supplied to the first coil unit 35, and therefore the direction of the magnetic field generated by the first coil unit 35 changes periodically, and therefore the value of the magnetic flux generated in the first coil unit 35 changes periodically.

[0129] The external control unit CU may control power from the AC power supply BA1 so that an AC pulse voltage is supplied to the saturated coil unit 45. In this case, current flows from the AC power supply BA1 to the saturated coil conductor 46, causing the saturated coil unit 45 to generate a magnetic field. The saturated core 41 strengthens the magnetic field generated by the saturated coil unit 45. Magnetic flux passes through the saturated core 41. The magnetic action end 43G, which is a variable magnetic force magnet, is magnetized by the magnetic field passing through the saturated core 41, becoming a magnet that generates a magnetic field (magnetic flux) toward the wall 21. In the saturated core 41, a magnetic field (magnetic flux) is generated from the magnetic action end 43G through the wall 21 toward the magnetic action end 44.

[0130] Fig. 15(b) is a graph showing an example of the relationship between time and the magnetic flux generated by the saturated coil section and the magnetic action end section of the power transmission system shown in Fig. 14. As shown in Fig. 15(b), the magnetic action end section 43G, which is a variable magnetic force magnet, is magnetized by the magnetic flux generated in the saturated coil section 45, so that a magnetic field is generated by the magnetic action end section 43G even during a period when power is not supplied to the saturated coil section 45.

[0131] In this way, the magnetic flux generated by magnetizing the variable magnetic force magnet (magnetic force acting end 43G) in the saturated magnetic flux generating module 40G acts on the wall portion 21, so the power transmission system 100G and the coil device 200G can efficiently magnetically saturate the wall portion 21.

[0132] In the saturated magnetic flux generating module 40G, the two magnetic force acting ends 44 of the saturated core 41 may be configured with variable magnetic force magnets. Also, the external control unit CU may control the power from the DC power supply BA2 so that a DC pulse voltage is supplied to the saturated coil unit 45.

[0133] Fig. 16 is a schematic side view showing an example of a power transmission system according to a modified example. In a power transmission system 101G and a coil device 201G shown in Fig. 16, at least one of the two magnetic action ends of the saturated core 41 of a saturated magnetic flux generating module 40G may be configured with a variable magnetic force magnet. In the example shown in Fig. 16, in the saturated magnetic flux generating module 40G, the two magnetic action ends 43G of the saturated core 41 are configured with a variable magnetic force magnet. Furthermore, in the power transmission system 101G and the coil device 201G, a saturated coil conductor 46G of a saturated coil section 45G of the saturated magnetic flux generating module 40G is connected to an end of a spiral-shaped first coil conductor 36G constituting a first coil section 35G of a first power transmitting and receiving module 30G. The power transmission system 100G and coil device 200G shown in Figure 14 above differ from the power transmission system 101G and coil device 201G shown in Figure 16 in that a periodic voltage is supplied to the first coil section 35 of the first power transmission and reception module 30G and a pulse voltage is supplied to the saturated coil section 45 of the saturated magnetic flux generating module 40.

[0134] Fig. 17 is a graph showing an example of the relationship between time and magnetic flux generated by the power transmission system shown in Fig. 16. Fig. 17 is a graph showing an example of the relationship between time and magnetic flux generated by the saturated coil section of the power transmission system shown in Fig. 16. As shown in Fig. 17, the magnetic flux generated in the first coil section 35G changes suddenly when a pulse voltage is supplied and changes periodically when a pulse voltage is not supplied. The external control unit CU controls the power from the AC power supply BA1 so that an AC voltage is supplied to the first coil section 35G and the saturated coil section 45G and so that a pulse voltage is not supplied. As a result, the direction of the magnetic field generated by the first coil section 35G and the saturated coil section 45G changes periodically, and therefore the value of the magnetic flux generated in the first coil section 35G and the saturated coil section 45G changes periodically.

[0135] The external control unit CU may control power from the AC power supply BA1 so that an AC pulse voltage is supplied to the first coil portion 35G and the saturated coil portion 45G. In this case, current flows from the AC power supply BA1 to the saturated coil conductor 46G, causing the saturated coil portion 45G to generate a magnetic field. The saturated core 41 strengthens the magnetic field generated by the saturated coil portion 45G. Magnetic flux passes through the saturated core 41. The magnetic action end 43G, which is a variable magnetic force magnet, is magnetized by the magnetic field passing through the saturated core 41, becoming a magnet that generates a magnetic field (magnetic flux) toward the wall portion 21. In the saturated core 41, a magnetic field (magnetic flux) is generated from the magnetic action end 43G through the wall portion 21 toward the magnetic action end 44.

[0136] In this way, the first coil section 35G and the saturation coil section 45G may be connected in series. Alternatively, as in the second modified example, the first coil section 35G and the saturation coil section 45G may be connected in parallel. Furthermore, as in the fourth modified example, the first core 31 and the saturation core 41 may be commonly wound by the first coil section 35D. In these cases, the magnetic flux generated by supplying a current to the saturation coil section 45 in the saturation magnetic flux generating module 40G and the magnetic flux generated by magnetizing the variable magnetic force magnet (magnetic force acting end section 43G) act on the wall section 21, so that the power transmission system 100G and the coil device 200G can efficiently magnetically saturate the wall section 21.

[0137] <Seventh Modification> Fig. 18 is a schematic plan view showing an example of a power transmission system according to a modified example. In a power transmission system 100H and a coil device 200H shown in Fig. 18, a saturated core 41H of a saturated magnetic flux generating module 40H extends, for example, in a direction intersecting the first core body 32 of the first core 31 and in a direction along the wall 21. The saturated core 41H of the seventh modified example differs from the power transmission system 100 and the coil device 200 of the embodiment in that it does not extend along the X-axis direction orthogonal to the first core body 32 of the first core 31.

[0138] Even if the saturated core 41H of the saturated magnetic flux generating module 40H is not perpendicular to the first core 31, the saturated core 41H extends along the wall 21, and thus the wall 21 can be magnetically saturated in the range in which the saturated core 41H extends. Therefore, in the horizontal direction, at least a part H3 of the magnetic field generated in the wall 21 from the magnetic action end 33 of the first power transmitting and receiving module 30 is prevented from traveling only through the wall 21 toward the magnetic action end 34. In other words, the saturated magnetic flux generating module 40H can reduce magnetic flux leakage in the first power transmitting and receiving module 30.

[0139] <Eighth Modification> Fig. 19 is a schematic plan view showing an example of a power transmission system according to a modification. In a power transmission system 100I and a coil device 200I shown in Fig. 19, a saturated core 41I of a saturated magnetic flux generating module 40I extends, for example, in a direction intersecting the first core body 32 of the first core 31 and along the wall 21. The saturated core 41I of the eighth modification differs from the power transmission system 100 and the coil device 200 of the embodiment in that it does not extend along the X-axis direction orthogonal to the first core body 32 of the first core 31.

[0140] Furthermore, at least a portion of the saturated core 41I is located between the two magnetically active ends 33, 34 of the first power transmitting and receiving module 30, and extends longer in the Y-axis direction (extension direction of the first core 31) than the first core 31 of the first power transmitting and receiving module 30. A portion of the saturated core 41I may be located outward in the Y-axis direction (extension direction of the first core 31) than the first core 31 of the first power transmitting and receiving module 30. In the example shown in FIG. 19 , one end of the saturated core 41I in the X-axis direction is located in the positive direction of the Y-axis relative to the magnetically active end 33 of the first power transmitting and receiving module 30. The eighth modification differs from the power transmitting system 100H and the coil device 200H of the seventh modification in that one end of the saturated core 41I in the X-axis direction is located in the positive direction of the Y-axis relative to the magnetically active end 33 of the first power transmitting and receiving module 30.

[0141] Even if the saturated core 41I of the saturated magnetic flux generating module 40I is not perpendicular to the first core 31 and a part of the saturated core 41I of the saturated magnetic flux generating module 40I is disposed outside the first power transmitting and receiving module 30, the saturated core 41I extends along the wall 21, thereby magnetically saturating the wall 21 in the range in which the saturated core 41I extends. Therefore, in the horizontal direction, at least a part H3 of the magnetic field generated in the wall 21 from the magnetic force action end 33 of the first power transmitting and receiving module 30 is prevented from traveling only through the wall 21 toward the magnetic force action end 34. In other words, the saturated magnetic flux generating module 40I can reduce magnetic flux leakage in the first power transmitting and receiving module 30.

[0142] <Ninth Variation> Fig. 20 is a schematic plan view showing an example of a power transmission system according to a modified example. The power transmission system 100J and the coil device 200J shown in Fig. 20 differ from the power transmission system 100 and the coil device 200 of the embodiment in that they further include a second saturation magnetic flux generator 60 and a third saturation magnetic flux generator 70 as other saturation magnetic flux generators. The second saturation magnetic flux generator 60 and the third saturation magnetic flux generator 70 are each provided on one side of the wall portion 21 and magnetically saturate the wall portion 21.

[0143] In the example shown in FIG. 20 , the second saturated magnetic flux generator 60 has a second saturated core 61. The second saturated magnetic flux generator 60 may have a second saturated core main body 62. The second saturated magnetic flux generator 60 has two magnetically acting ends 63, 64 facing the wall 21. At least a portion of the first power transmitting and receiving module 30 and the saturated magnetic flux generating module 40 is disposed between the two magnetically acting ends 63, 64 of the second saturated magnetic flux generator 60. In the example shown in FIG. 20 , the first power transmitting and receiving module 30 and the saturated magnetic flux generating module 40 are disposed between the two magnetically acting ends 63, 64 of the second saturated magnetic flux generator 60 in the X-axis direction. In the Y-axis direction, the two magnetically acting ends 63, 64 may cover the first power transmitting and receiving module 30 and the saturated magnetic flux generating module 40.

[0144] In the example shown in FIG. 20 , the third saturated magnetic flux generator 70 has a third saturated core 71. The third saturated magnetic flux generator 70 may have a third saturated core main body 72. The third saturated magnetic flux generator 70 has two magnetically acting end portions 73, 74 facing the wall portion 21. At least a portion of the first power transmitting and receiving module 30 and the saturated magnetic flux generating module 40 is disposed between the two magnetically acting end portions 73, 74 of the third saturated magnetic flux generator 70. In the example shown in FIG. 20 , the first power transmitting and receiving module 30 and the saturated magnetic flux generating module 40 are disposed between the two magnetically acting end portions 73, 74 of the third saturated magnetic flux generator 70 in the Y-axis direction. The two magnetically acting end portions 73, 74 may cover the first power transmitting and receiving module 30 and the saturated magnetic flux generating module 40 in the X-axis direction. 20 , in the Y-axis direction, the second saturation magnetic flux generator 60 is disposed between the two magnetic force application ends 73, 74 of the third saturation magnetic flux generator 70. In the X-axis direction, the two magnetic force application ends 73, 74 may cover the second saturation magnetic flux generator 60. Other configurations of the second saturation magnetic flux generator 60 and the third saturation magnetic flux generator 70 are the same as the configuration of the saturation magnetic flux generating module 40.

[0145] The second saturation magnetic flux generating unit 60 and the third saturation magnetic flux generating unit 70 magnetically saturate the wall portion 21 on the outer side of the two magnetic force acting ends 33, 34 of the first power transmitting and receiving module 30, thereby suppressing the generation of magnetic flux toward the outer wall portion 21 in the first power transmitting and receiving module 30 and facilitating the generation of magnetic flux between the first power transmitting and receiving module 30 and a device (second power transmitting and receiving module 50) provided on the other side of the wall portion 21. This suppresses magnetic flux leakage to the wall portion 21. In particular, in a configuration in which the coil device 200J is disposed, such as the rear portion 2a of the housing 20 or the power generating pod 2, even if the wall portion 21 has a closed shape (annular or frame-like), the generation of magnetic flux circulating around the wall portion 21 can be suppressed.

[0146] [Note] The coil device and the power transmission system include the following components.

[0147] The present disclosure provides: [1] "a power transmitting and receiving unit provided on one side of a wall of a magnetic body, which transmits or receives power between the power transmitting and receiving unit and a device provided on the other side of the wall; a saturation magnetic flux generating section provided on one side of the wall section and magnetically saturating the wall section; Equipped with the power transmitting and receiving unit has a coil portion including a wound conductor and two magnetically acting end portions facing the wall portion, The saturated magnetic flux generating unit has two magnetic force acting end portions facing the wall portion and disposed between the two magnetic force acting end portions of the power transmitting and receiving unit. Coil device."

[0148] The present disclosure states that [2] "the conductor of the coil portion of the power transmitting and receiving unit forms two openings facing the wall portion as the two magnetic force acting ends, The coil device according to the above [1], wherein the saturated magnetic flux generating section has a saturated coil section including a conductor wound so as to form two openings facing the wall section as the two magnetic force acting end sections.

[0149] The present disclosure states, [3] "The saturated magnetic flux generating unit has, as the two magnetic force acting end portions, two magnets that respectively cover the two magnetic force acting end portions of the power transmitting and receiving unit along the wall portion, The coil device described in [1] above.

[0150] The present disclosure states, [4] "The power transmitting and receiving unit has a power transmitting and receiving core including two contacts facing the wall portion as the two magnetically acting ends, the conducting wire of the coil portion is wound around the power transmitting and receiving core, The saturated magnetic flux generating unit is a saturated core including two contacts facing the wall portion as the two magnetically acting ends and disposed between the two contacts of the power transmitting / receiving core; a saturated coil portion including a conductive wire wound around the saturated core; The coil device according to the above [1],

[0151] The present disclosure states, [5] "The power transmitting and receiving unit has a power transmitting and receiving core including two contacts facing the wall portion as the two magnetically acting ends, the saturated magnetic flux generating unit includes two contact points facing the wall portion as the two magnetic force acting end portions, and has a saturated core disposed between the two contact points of the power transmitting and receiving core; The coil device according to the above [1], wherein the coil portion of the power transmitting and receiving portion is wound around both the power transmitting and receiving core and the saturated core.

[0152] The present disclosure is [6] "The coil device described in [5] above, further comprising a DC power supply and an AC power supply electrically connected to the coil portion."

[0153] The present disclosure is [7] "The coil device according to any one of the above [4] to [6], wherein at least one of the transmitting and receiving core and the saturated core is more magnetic than the wall portion."

[0154] The disclosure states, [8] "The saturation core extends along the wall portion, The coil device according to any one of the above [4] to [6], wherein at least a part of the saturated core is located between the two magnetically acting end portions of the power transmitting and receiving unit.

[0155] The present disclosure is [9] "A coil device according to the above [2] or [4], further comprising a DC power supply electrically connected to the saturated coil portion."

[0156] The present disclosure states,

[10] "The saturated magnetic flux generating unit includes two contacts facing the wall portion as the two magnetic force acting ends, and has a saturated core disposed between the two magnetic force acting ends of the power transmitting and receiving unit, The coil device according to any one of the above [4] to [8], wherein at least one of the two contact points of the saturated core is configured by a magnet.

[0157] The present disclosure is

[11] "A coil device described in any one of [4] to [8] and

[10] above, wherein at least one of the two contact points of the saturated core is constituted by a variable magnetic force magnet."

[0158] The present disclosure further provides,

[12] "a magnetic flux generating section having two magnetic force acting ends facing the wall portion, provided on one side of the wall portion, and magnetically saturating the wall portion, The coil device according to any one of the above [1] to

[11] , wherein at least a part of the power transmitting and receiving unit and the saturated magnetic flux generating unit is disposed between the two magnetic force acting end portions of the other saturated magnetic flux generating unit.

[0159] The present disclosure

[13] provides a first coil device including: a first power transmitting / receiving unit provided on one side of a wall portion of a magnetic body and capable of transmitting or receiving power; and a saturation magnetic flux generating unit provided on one side of the wall portion and magnetically saturating the wall portion; a second coil device provided on the other side of the wall portion and having a second power transmitting and receiving unit that transmits or receives power between the second power transmitting and receiving unit and the first power transmitting and receiving unit; Equipped with the first power transmitting / receiving unit has a first coil unit including a wound conductor and two magnetically acting end portions facing the wall portion; the second power transmitting / receiving unit has a second coil unit including a wound conductor and two magnetically acting end portions facing the wall portion, the first power transmitting and receiving unit can be arranged to face the two magnetically acting ends of the second power transmitting and receiving unit across the wall, the saturated magnetic flux generation unit faces the wall portion and has two magnetic force action ends disposed between the two magnetic force action ends of the first power transmitting and receiving unit, Power transmission system.

[0160] The present disclosure provides

[14] "a power transmission method for transmitting and receiving power between a first power transmitting and receiving unit provided on one side of a wall of a magnetic body and a second power transmitting and receiving unit provided on the other side of the wall, generating a magnetic field in the wall portion to magnetically saturate a portion of the wall portion; transmitting and receiving power between the first power transmitting and receiving unit and the second power transmitting and receiving unit by the first power transmitting and receiving unit or the second power transmitting and receiving unit generating a fluctuating magnetic field in another area of ​​the wall portion sandwiching the magnetically saturated area; "A method of transmitting electricity, including: [Explanation of symbols]

[0161] 1. Water current power generation device (example of device) 21 Wall 30, 30A, 30B, 30C, 30D First power transmitting and receiving module (an example of a first power transmitting and receiving unit) 31 First Core 33,34,33A,34A,43,43A,43E,43F,43G,44,44A,44E,44F,53,53A,54,54A,63,64,73,74 Magnetic force action end 35, 35A, 35B, 35C, 35D First coil section 36, 36A, 36C First coil conductor (example of conductor) 46, 46A, 46C Saturated coil conductor (example of conductor) 56, 56A Second coil conductor (example of conductor) 40, 40A, 40C, 40D, 40E, 40F, 40G, 40H, 40I Saturation magnetic flux generating module (an example of a saturation magnetic flux generating unit) 41,41H,41I saturated core 45, 45A, 45C saturated coil section 50,50A Second power transmission / reception module (an example of a second power transmission / reception unit) 55, 55A, 55C Second coil section 100, 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J Power Transmission System 200, 200A, 200B, 200C, 200c, 200D, 200E, 200F, 200G, 200H, 200I, 200J Coil device BA1 AC power supply BA2 DC power supply MFA,MFB,MFC area

Claims

1. a power transmitting / receiving unit provided on one side of a wall portion of the magnetic body and configured to transmit or receive power between the power transmitting / receiving unit and a device provided on the other side of the wall portion; a saturation magnetic flux generating section provided on one side of the wall section and magnetically saturating the wall section; Equipped with the power transmitting and receiving unit has a coil portion including a wound conductor and two magnetically acting end portions facing the wall portion, the saturated magnetic flux generating unit has two magnetic force acting end portions facing the wall portion and disposed between the two magnetic force acting end portions of the power transmitting and receiving unit, Coil device.

2. the conductor of the coil portion of the power transmitting and receiving unit forms two openings facing the wall portion as the two magnetic force acting end portions, 2. The coil device according to claim 1, wherein the saturated magnetic flux generating portion has a saturated coil portion including a conductor wound so as to form two openings facing the wall portion as the two magnetic force acting end portions.

3. the saturated magnetic flux generating unit has, as the two magnetic force action ends, two magnets that respectively cover the two magnetic force action ends of the power transmitting and receiving unit along the wall portion; The coil device according to claim 1 .

4. the power transmitting and receiving unit has a power transmitting and receiving core including two contacts facing the wall portion as the two magnetic force acting end portions, the conducting wire of the coil portion is wound around the power transmitting and receiving core, The saturated magnetic flux generating unit is a saturated core including two contacts facing the wall portion as the two magnetically acting ends and disposed between the two contacts of the power transmitting / receiving core; a saturated coil portion including a conductive wire wound around the saturated core; The coil device of claim 1 , comprising:

5. the power transmitting and receiving unit has a power transmitting and receiving core including two contacts facing the wall portion as the two magnetic force acting end portions, the saturated magnetic flux generating unit includes two contact points facing the wall portion as the two magnetic force acting end portions, and has a saturated core disposed between the two contact points of the power transmitting and receiving core; The coil device according to claim 1 , wherein the coil portion of the power transmitting and receiving portion is wound around both the power transmitting and receiving core and the saturated core.

6. The coil device according to claim 5 , further comprising a DC power supply and an AC power supply electrically connected to the coil portion.

7. 7. The coil device according to claim 4, wherein at least one of the power transmitting and receiving core and the saturation core has higher magnetic properties than the wall portion.

8. the saturated core extends along the wall; 7. The coil device according to claim 4, wherein at least a portion of the saturated core is located between the two magnetically acting ends of the power transmitting and receiving unit.

9. The coil device according to claim 2 or 4, further comprising a DC power supply electrically connected to the saturated coil portion.

10. the saturated magnetic flux generating unit includes two contacts facing the wall portion as the two magnetic force action ends, and has a saturated core disposed between the two magnetic force action ends of the power transmitting and receiving unit; The coil device according to claim 1 , wherein at least one of the two contact points of the saturated core is formed by a magnet.

11. 7. The coil device according to claim 4, wherein at least one of the two contact points of the saturated core is formed by a variable magnetic force magnet.

12. a second saturation magnetic flux generating section provided on one side of the wall section and having two magnetic force acting ends facing the wall section, the second saturation magnetic flux generating section magnetically saturating the wall section; The coil device according to any one of claims 1 to 6, wherein at least a portion of the power transmitting and receiving unit and the saturated magnetic flux generating unit are arranged between the two magnetic force acting ends of the other saturated magnetic flux generating unit.

13. a first coil device including a first power transmitting / receiving unit provided on one side of a wall portion of a magnetic body and capable of transmitting or receiving power, and a saturation magnetic flux generating unit provided on one side of the wall portion and magnetically saturating the wall portion; a second coil device provided on the other side of the wall portion and having a second power transmitting and receiving unit that transmits and receives power between the second coil device and the first power transmitting and receiving unit; Equipped with the first power transmitting and receiving unit has a first coil unit including a wound conductor and two magnetically acting end portions facing the wall portion, the second power transmitting and receiving unit has a second coil unit including a wound conductor and two magnetically acting end portions facing the wall portion, the first power transmitting and receiving unit can be arranged to face the two magnetically acting ends of the second power transmitting and receiving unit across the wall, the saturated magnetic flux generation unit has two magnetic force action ends that face the wall portion and are disposed between the two magnetic force action ends of the first power transmitting and receiving unit, Power transmission system.

14. A power transmission method for transmitting and receiving power between a first power transmitting and receiving unit provided on one side of a wall portion of a magnetic body and a second power transmitting and receiving unit provided on the other side of the wall portion, generating a magnetic field in the wall portion to magnetically saturate a portion of the wall portion; transmitting and receiving power between the first power transmitting and receiving unit and the second power transmitting and receiving unit by the first power transmitting and receiving unit or the second power transmitting and receiving unit generating a fluctuating magnetic field in another region of the wall portion that sandwiches the magnetically saturated region; A power transmission method comprising:

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