JP5825108B2 - Power receiving device and power transmitting device - Google Patents

Description

  The present invention relates to a power reception device, a power transmission device, and a power transmission system.

  In recent years, various proposals have been made for a power receiving device, a power transmitting device, and a power transmission system for transmitting power in a non-contact manner, and such a power receiving device and a power transmitting device are provided with a coil.

  And electric power is transmitted non-contactedly to the coil provided in the power receiving apparatus by flowing an electric current through the coil provided in the power transmitting apparatus.

  For example, each of the power receiving device and the power transmitting device described in Japanese Patent Application Laid-Open No. 2011-142177 includes a coil unit that transmits electric power, and the coil unit has a tape-like conductor member facing the tape surface. And a coil formed by spirally winding and a magnetic core that supports the back surface of the coil.

  The conductor member is formed by laminating a tape-like conductor layer and a tape-like insulating layer in the thickness direction. For this reason, the coil is arrange | positioned so that a conductor layer and an insulating layer may become alternate centering on the winding center. The said magnetic body core is formed in the substantially disc shape, and the said coil is arrange | positioned at the upper surface or the lower surface.

  Moreover, the power receiving apparatus and power transmission apparatus described in JP2011-187559A include a non-contact power transmission film.

  The non-contact power transmission film includes a base film having a first main surface and a second main surface arranged in the thickness direction, a first antenna pattern layer formed on the first main surface by screen printing, and a second main pattern. A second antenna pattern layer formed on the surface by screen printing; a first insulation pattern layer formed on the first antenna pattern layer; a second insulation pattern layer formed so as to cover the second antenna pattern layer; including.

JP 2011-142177 A JP 2011-187559 A

  However, the coil described in Japanese Patent Application Laid-Open No. 2011-142177 is formed so that the width of the conductor layer and the width of the insulating layer coincide.

  For this reason, the insulation distance between the conductor layers facing each other with a coil pitch is short, and there is a possibility that electric discharge occurs between the conductor layers during power transmission.

  In the non-contact power transmission film described in JP 2011-187559 A, the thermal expansion coefficient of the base film, the thermal expansion coefficients of the first antenna pattern layer and the second antenna pattern layer, and the first insulating pattern layer And the thermal expansion coefficient of the second insulating pattern layer is different.

  For this reason, when the temperature of the first antenna pattern layer or the second antenna pattern layer rises during power transmission, there is a gap between the first antenna pattern layer and the base film and between the first insulating pattern layer and the base film. May occur. Similarly, there may be a gap between the second antenna pattern layer and the base film and between the second insulating pattern layer and the base film.

  When gaps are generated between the members in this way, discharge may occur in adjacent portions of the first antenna pattern with a coil pitch. Similarly, in the second antenna pattern, a discharge may occur in a portion adjacent to the coil pitch.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a power receiving device, a power transmitting device, and a power transmission system in which discharge generated between coil pitches is suppressed. .

  The power receiving device according to the present invention includes a power receiving unit that receives electric power in a non-contact manner from a power transmitting unit provided outside. The power receiving unit includes a first coil formed by winding the first conductive wire with a pitch so as to surround the first winding center line, and a first insulating paper provided on the first coil. Including. The first coil includes a first portion and a second portion adjacent to the first portion with a pitch. The first insulating paper is disposed between the first part and the second part. The first insulating paper protrudes outward from a first region sandwiched between the first portion and the second portion in a cross section perpendicular to the extending direction of the first coil.

  Preferably, the first insulating paper is arranged in the arrangement direction of the first part and the second part in a cross section perpendicular to the extending direction of the first coil, and is arranged so as to sandwich the first conductor. And a second side part, and a connection part that connects the first side part and the second side part. Preferably, the first insulating paper includes a first side portion and a second side portion arranged so as to sandwich the first conductive wire, and a connection portion connecting the first side portion and the second side portion. The length of the first conductor in the direction perpendicular to the arrangement direction of the first part and the second part is the width of the first conductor, and the length of the first side and the second side in the direction perpendicular to the arrangement direction Is the width of the first side portion and the second side portion, the width of the first side portion and the second side portion is larger than the width of the first conductor.

  Preferably, the first coil includes a first end and a second end. The first coil extends from the first end toward the second end so as to surround the first winding center line and is displaced in the extending direction of the first winding center line. It is formed by bending a conducting wire. The connecting portion is provided so as to cover a portion of the first conducting wire located on the opposite side to the portion facing the first winding center line in a cross section perpendicular to the extending direction of the first coil. The part is provided so as to extend in a direction in which the first coil extends. Preferably, the first coil includes a first end and a second end. The first coil extends from the first end toward the second end so as to surround the first winding center line and is displaced in the extending direction of the first winding center line. It is formed by bending a conducting wire. In the cross section perpendicular to the direction in which the first coil extends, the connection portion includes a first covering portion that covers a portion of the surface of the first conductor facing the first winding center line, and a surface of the first conductor. A second covering portion covering a portion located on the opposite side of the portion facing the first winding center line. The first covering portion is provided in the first portion, and the second covering portion is provided in the second portion.

  Preferably, the first coil includes a first end and a second end. The first coil extends from the first end toward the second end so as to surround the first winding center line and to extend away from the first winding center line. It is formed by bending. The connecting portion covers a first end surface of the first end surface and the second end surface of the first conducting wire arranged in the extending direction of the first winding center line in a cross section perpendicular to the extending direction of the first coil. Provided so as to extend in the extending direction of the first coil.

  Preferably, the first coil includes a first end and a second end. The first coil extends from the first end toward the second end so as to surround the first winding center line and to extend away from the first winding center line. It is formed by bending. The connecting portion covers a first end surface of the first end surface and the second end surface of the first conducting wire arranged in the extending direction of the first winding center line in a cross section perpendicular to the extending direction of the first coil. A third covering portion provided, and a fourth covering portion provided so as to cover the second end face. The third covering portion is provided in the first portion, and the fourth covering portion is provided in the second portion.

  Preferably, the first coil includes a first end and a second end. The first coil extends from the first end toward the second end so as to surround the first winding center line and is displaced in the extending direction of the first winding center line. It is formed by bending a conducting wire. The first insulating paper is formed to extend from the first region to the first winding center line side and to extend to the opposite side of the first region with respect to the first winding center line.

  Preferably, the first coil includes a first end and a second end. The first coil extends from the first end toward the second end so as to surround the first winding center line and to extend away from the first winding center line. It is formed by bending. In a cross section perpendicular to the extending direction of the first coil, the first conducting wire includes a first end surface and a second end surface arranged in the extending direction of the first winding center line. In a cross section in a direction perpendicular to the direction in which the first coil extends, the first insulating paper is formed to extend outward from the first region to the outside of the first end surface, and from the first region to the second end surface. It is formed to extend to the outside.

  Preferably, the difference between the natural frequency of the power transmission unit and the natural frequency of the power reception unit is 10% or less of the natural frequency of the power reception unit.

Preferably, the coupling coefficient between the power reception unit and the power transmission unit is 0.1 or less.
Preferably, the power reception unit includes a magnetic field that is formed between the power reception unit and the power transmission unit and vibrates at a specific frequency, and an electric field that is formed between the power reception unit and the power transmission unit and vibrates at a specific frequency. Power is received from the power transmission unit through at least one of them.

  The power transmission device according to the present invention includes a power transmission unit that transmits electric power in a non-contact manner to a power reception unit provided outside. The power transmission unit includes a second coil formed by winding the second conducting wire with a pitch so as to surround the second winding center line, and a second insulating paper provided on the second coil. Including. The second coil includes a third portion and a fourth portion adjacent to the third portion with a pitch. The second insulating paper is disposed between the third portion and the fourth portion. The second insulating paper is disposed between the third portion and the fourth portion, and protrudes outward from the second region sandwiched between the third portion and the fourth portion.

  Preferably, the second insulating paper is arranged in the arrangement direction of the third portion and the fourth portion in a cross section perpendicular to the extending direction of the second coil, and the third side portion is arranged so as to sandwich the second conductor. And a fourth side part, and a connection part that connects the third side part and the fourth side part. Preferably, the second insulating paper includes a third side portion and a fourth side portion that are arranged so as to sandwich the second conductive wire, and a connection portion that connects the third side portion and the fourth side portion. The length of the second conductor in the direction perpendicular to the arrangement direction of the third part and the fourth part is defined as the width of the second conductor, and the lengths of the third and fourth sides in the direction perpendicular to the arrangement direction Is the width of the third side portion and the fourth side portion, the width of the third side portion and the fourth side portion is larger than the width of the second conductor.

  Preferably, the second coil includes a third end and a fourth end. The second coil extends from the third end portion toward the fourth end portion so as to surround the periphery of the second winding center line and is displaced in the extending direction of the second winding center line. It is formed by bending a conducting wire. The connecting portion is provided so as to cover a portion of the second conducting wire located on the opposite side to the portion facing the second winding center line in a cross section perpendicular to the extending direction of the second coil. The part is provided so as to extend in a direction in which the second coil extends.

  Preferably, the second coil includes a third end and a fourth end. The second coil extends from the third end portion toward the fourth end portion so as to surround the periphery of the second winding center line and is displaced in the extending direction of the second winding center line. It is formed by bending a conducting wire. In the cross section perpendicular to the direction in which the second coil extends, the connection portion includes a third covering portion that covers a portion of the surface of the second conductor facing the second winding center line, and a surface of the second conductor. And a fourth covering portion that covers a portion located on the opposite side of the portion facing the second winding center line. The third covering portion is provided in the third portion, and the fourth covering portion is provided in the fourth portion.

  Preferably, the second coil includes a third end and a fourth end. The second coil extends from the third end to the fourth end so as to surround the second winding center line and to extend away from the second winding center line. It is formed by bending. The connecting portion covers a third end surface of the third end surface and the fourth end surface of the second conducting wire arranged in the extending direction of the second winding center line in a cross section perpendicular to the extending direction of the second coil. Provided so as to extend in the extending direction of the second coil.

  Preferably, the second coil includes a third end and a fourth end. The second coil extends from the third end to the fourth end so as to surround the second winding center line and to extend away from the second winding center line. It is formed by bending. The connecting portion covers a third end surface of the third end surface and the fourth end surface of the second conducting wire arranged in the extending direction of the second winding center line in a cross section perpendicular to the extending direction of the second coil. A third covering portion provided, and a fourth covering portion provided so as to cover the fourth end face. The third covering portion is provided in the third portion, and the fourth covering portion is provided in the fourth portion.

  Preferably, the second coil includes a third end and a fourth end. The second coil extends from the third end portion toward the fourth end portion so as to surround the periphery of the second winding center line and is displaced in the extending direction of the second winding center line. It is formed by bending a conducting wire. The second insulating paper is formed to extend from the second region to the second winding center line side and to extend to the opposite side of the second region with respect to the second winding center line.

  Preferably, the second coil includes a third end and a fourth end. The second coil extends from the third end to the fourth end so as to surround the second winding center line and to extend away from the second winding center line. It is formed by bending. In a cross section perpendicular to the extending direction of the second coil, the second conducting wire includes a third end surface and a fourth end surface arranged in the extending direction of the second winding center line. In a cross section in a direction perpendicular to the direction in which the second coil extends, the second insulating paper is formed to extend outward from the second region to the third end surface, and from the second region to the fourth end surface. It is formed to extend to the outside.

  Preferably, the difference between the natural frequency of the power transmission unit and the natural frequency of the power reception unit is 10% or less of the natural frequency of the power reception unit. Preferably, the coupling coefficient between the power reception unit and the power transmission unit is 0.1 or less.

  Preferably, the power reception unit includes a magnetic field that is formed between the power reception unit and the power transmission unit and vibrates at a specific frequency, and an electric field that is formed between the power reception unit and the power transmission unit and vibrates at a specific frequency. Power is received from the power transmission unit through at least one of them.

  The power transmission system according to the present invention is a power transmission system including a power transmission device including a power transmission unit and a power reception device including a power reception unit that receives power from the power transmission unit in a contactless manner. The power receiving unit includes a first coil formed by winding the first conductive wire with a pitch so as to surround the first winding center line, and a first insulating paper provided on the first coil. Including. The first coil includes a first portion and a second portion adjacent to the first portion with a pitch. The first insulating paper is disposed between the first portion and the second portion, and extends in the extending direction of the first coil. The insulating paper includes a pitch insulating portion protruding outward from a first region sandwiched between the first portion and the second portion in a cross section perpendicular to the extending direction of the first coil. The power transmission unit includes a second coil formed by winding the second conducting wire with a pitch so as to surround the second winding center line, and a second insulating paper provided on the second coil. Including. The second coil includes a third portion and a fourth portion adjacent to the third portion with a pitch. The second insulating paper is disposed between the third portion and the fourth portion, and extends in the direction in which the second coil extends. The second insulating paper includes a pitch insulating portion protruding outward from a second region sandwiched between the third portion and the fourth portion in a cross section perpendicular to the extending direction of the second coil.

  According to the power reception device, the power transmission device, and the power transmission system according to the present invention, it is possible to suppress the occurrence of discharge between coil pitches.

It is a schematic diagram which shows typically the power receiving apparatus which concerns on this Embodiment, a power transmission apparatus, and an electric power transmission system. It is a schematic diagram which shows the simulation model of an electric power transmission system. It is a graph which shows the simulation result of the simulation model shown in FIG. It is a graph which shows the relationship between the electric power transmission efficiency when changing the air gap AG in the state which fixed the natural frequency f0, and the frequency f3 of the electric current supplied to the resonance coil 24. It is the figure which showed the relationship between the distance from an electric current source (magnetic current source), and the intensity | strength of an electromagnetic field. 3 is a perspective view showing a resonance coil 11 provided in the power receiving device 40 and members provided around the resonance coil 11. FIG. It is a perspective view which shows the state which removed the insulating paper 30 from the state shown in FIG. It is sectional drawing in the VIII-VIII line of FIG. It is sectional drawing in the IX-IX line shown in FIG. 3 is a perspective view showing a resonance coil 24 and insulating paper provided in the resonance coil 24. FIG. It is a perspective view which shows the state which removed the insulating paper 130 from the state shown in FIG. It is sectional drawing in the XII-XII line | wire shown in FIG. It is sectional drawing in the XIII-XIII line | wire shown in FIG. 3 is a perspective view showing a resonance coil 11 provided in the power receiving device 40 and insulating paper provided in the resonance coil 11. FIG. It is a perspective view which shows the state which removed the insulating paper 230 from the state shown in FIG. It is sectional drawing in the XVI-XVI line shown in FIG. It is sectional drawing in the XVII-XVII line shown in FIG. 3 is a perspective view showing a resonance coil 24 and insulating paper provided in the resonance coil 24. FIG. It is a perspective view which shows the state which removed the insulating paper 330 from the state shown in FIG. It is sectional drawing in the XX-XX line shown in FIG. It is sectional drawing in the XXI-XXI line shown in FIG. 3 is a perspective view showing a resonance coil 11 provided in a power reception unit 27 and insulating paper provided in the resonance coil 11. FIG. It is sectional drawing in the XXIII-XXIII line shown in FIG. 10 is a perspective view showing a resonance coil 11 provided in a power receiving device 40 according to Embodiment 4 and insulating paper provided in the resonance coil 11. FIG. It is sectional drawing in the XXV-XXV line | wire shown in FIG. 10 is a perspective view showing a resonance coil 11 provided in a power receiving device 40 according to a fifth embodiment and an insulating paper 630 provided in the resonance coil 11. FIG. It is sectional drawing in the XXVII-XXVII line shown in FIG. 10 is a perspective view showing a resonance coil 11 of a power receiving device 40 provided in the sixth embodiment and an insulating paper 730 provided in the resonance coil 11. FIG. FIG. 29 is a cross-sectional view in which a part of FIG. 28 is enlarged. It is a perspective view which shows the power receiving part 27 provided in the power receiving apparatus 40 of this Embodiment. 5 is a perspective view showing a coil holding member 802. FIG. 6 is a cross-sectional view showing a part of a groove 806. FIG. It is a perspective view which shows the power transmission part 28 of the power transmission apparatus 41 which concerns on this Embodiment. It is a perspective view which shows the coil support member 852. 5 is a cross-sectional view showing a part of a coil support member 852. FIG.

  A power receiving device, a power transmission device, and a power transmission system according to the present invention will be described with reference to FIGS.

(Embodiment 1)
FIG. 1 is a schematic diagram schematically showing a power reception device, a power transmission device, and a power transmission system according to the present embodiment.

  The power transmission system according to the first embodiment includes the electric vehicle 10 including the power receiving device 40 and the external power supply device 20 including the power transmission device 41. The power receiving device of the electric vehicle 10 stops at a predetermined position of the parking space 42 where the power transmission device 41 is provided, and mainly receives power from the power transmission device 41.

  The parking space 42 is provided with a line indicating a wheel stop, a parking position, and a parking range so that the electric vehicle 10 stops at a predetermined position.

  The external power supply device 20 includes a high frequency power driver 22 connected to the AC power source 21, a control unit 26 that controls driving of the high frequency power driver 22, and a power transmission device 41 connected to the high frequency power driver 22. The power transmission device 41 includes a power transmission unit 28 and an electromagnetic induction coil 23. The power transmission unit 28 includes a resonance coil 24 and a capacitor 25 connected to the resonance coil 24. The electromagnetic induction coil 23 is electrically connected to the high frequency power driver 22. In the example shown in FIG. 1, the capacitor 25 is provided, but the capacitor 25 is not necessarily an essential configuration.

  The power transmission unit 28 includes an electric circuit formed by the inductance of the resonance coil 24, the stray capacitance of the resonance coil 24, and the capacitance of the capacitor 25.

  The electric vehicle 10 includes a power receiving device 40, a rectifier 13 connected to the power receiving device 40, a DC / DC converter 14 connected to the rectifier 13, a battery 15 connected to the DC / DC converter 14, a power A control unit (PCU (Power Control Unit)) 16, a motor unit 17 connected to the power control unit 16, a vehicle ECU (Electronic Control Unit) for controlling driving of the DC / DC converter 14, the power control unit 16, and the like 18. Electric vehicle 10 according to the present embodiment is a hybrid vehicle including an engine (not shown), but includes an electric vehicle and a fuel cell vehicle as long as the vehicle is driven by a motor.

  The rectifier 13 is connected to the electromagnetic induction coil 12, converts an alternating current supplied from the electromagnetic induction coil 12 into a direct current, and supplies the direct current to the DC / DC converter 14.

  The DC / DC converter 14 adjusts the voltage of the direct current supplied from the rectifier 13 and supplies it to the battery 15. The DC / DC converter 14 is not an essential component and may be omitted. In this case, the DC / DC converter 14 can be substituted by providing a matching unit for matching impedance with the external power supply device 20 between the power transmission device 41 and the high-frequency power driver 22.

  The power control unit 16 includes a converter connected to the battery 15 and an inverter connected to the converter, and the converter adjusts (boosts) a direct current supplied from the battery 15 and supplies it to the inverter. The inverter converts the direct current supplied from the converter into an alternating current and supplies it to the motor unit 17.

  The motor unit 17 employs, for example, a three-phase AC motor and is driven by an AC current supplied from an inverter of the power control unit 16.

  When electric vehicle 10 is a hybrid vehicle, electric vehicle 10 further includes an engine. The motor unit 17 includes a motor generator that mainly functions as a generator and a motor generator that mainly functions as an electric motor.

  The power receiving device 40 includes a power receiving unit 27 and the electromagnetic induction coil 12. The power receiving unit 27 includes the resonance coil 11 and the capacitor 19. The resonance coil 11 has a stray capacitance. For this reason, the power reception unit 27 has an electric circuit formed by the inductance of the resonance coil 11 and the capacitances of the resonance coil 11 and the capacitor 19. The capacitor 19 is not an essential configuration and can be omitted.

  In the power transmission system according to the present embodiment, the difference between the natural frequency of power transmission unit 28 and the natural frequency of power reception unit 27 is 10% or less of the natural frequency of power reception unit 27 or power transmission unit 28. By setting the natural frequency of each power transmission unit 28 and power reception unit 27 in such a range, power transmission efficiency can be increased. On the other hand, when the difference between the natural frequencies becomes larger than 10% of the natural frequency of the power receiving unit 27 or the power transmitting unit 28, the power transmission efficiency becomes smaller than 10%, which causes problems such as a longer charging time of the battery 15. .

  Here, the natural frequency of the power transmission unit 28 is the vibration frequency when the electric circuit formed by the inductance of the resonance coil 24 and the capacitance of the resonance coil 24 freely vibrates when the capacitor 25 is not provided. Means. When the capacitor 25 is provided, the natural frequency of the power transmission unit 28 is a vibration frequency when the electric circuit formed by the capacitance of the resonance coil 24 and the capacitor 25 and the inductance of the resonance coil 24 freely vibrates. means. In the electric circuit, the natural frequency when the braking force and the electric resistance are zero or substantially zero is also referred to as a resonance frequency of the power transmission unit 28.

  Similarly, the natural frequency of the power receiving unit 27 is the vibration frequency when the electric circuit formed by the inductance of the resonance coil 11 and the capacitance of the resonance coil 11 freely vibrates when the capacitor 19 is not provided. Means. When the capacitor 19 is provided, the natural frequency of the power receiving unit 27 is the vibration frequency when the electric circuit formed by the capacitance of the resonance coil 11 and the capacitor 19 and the inductance of the resonance coil 11 freely vibrates. means. In the above electric circuit, the natural frequency when the braking force and the electric resistance are zero or substantially zero is also referred to as a resonance frequency of the power receiving unit 27.

  A simulation result obtained by analyzing the relationship between the natural frequency difference and the power transmission efficiency will be described with reference to FIGS. 2 and 3. FIG. 2 shows a simulation model of the power transmission system. The power transmission system 89 includes a power transmission device 90 and a power reception device 91, and the power transmission device 90 includes an electromagnetic induction coil 92 and a power transmission unit 93. The power transmission unit 93 includes a resonance coil 94 and a capacitor 95 provided in the resonance coil 94.

  The power receiving device 91 includes a power receiving unit 96 and an electromagnetic induction coil 97. The power receiving unit 96 includes a resonance coil 99 and a capacitor 98 connected to the resonance coil 99.

  The inductance of the resonance coil 94 is defined as an inductance Lt, and the capacitance of the capacitor 95 is defined as a capacitance C1. An inductance of the resonance coil 99 is an inductance Lr, and a capacitance of the capacitor 98 is a capacitance C2. When each parameter is set in this way, the natural frequency f1 of the power transmission unit 93 is represented by the following equation (1), and the natural frequency f2 of the power receiving unit 96 is represented by the following equation (2).

f1 = 1 / {2π (Lt × C1) ^1/2 } (1)
f2 = 1 / {2π (Lr × C2) ^1/2 } (2)
Here, when the inductance Lr and the capacitances C1 and C2 are fixed and only the inductance Lt is changed, the relationship between the deviation of the natural frequency of the power transmission unit 93 and the power reception unit 96 and the power transmission efficiency is shown in FIG. . In this simulation, the relative positional relationship between the resonance coil 94 and the resonance coil 99 is fixed, and the frequency of the current supplied to the power transmission unit 93 is constant.

  In the graph shown in FIG. 3, the horizontal axis indicates the deviation (%) of the natural frequency, and the vertical axis indicates the transmission efficiency (%) at a constant frequency. The deviation (%) in the natural frequency is expressed by the following equation (3).

(Deviation of natural frequency) = {(f1-f2) / f2} × 100 (%) (3)
As is clear from FIG. 3, when the deviation (%) in the natural frequency is ± 0%, the power transmission efficiency is close to 100%. When the deviation (%) in natural frequency is ± 5%, the power transmission efficiency is 40%. When the deviation (%) of the natural frequency is ± 10%, the power transmission efficiency is 10%. When the deviation (%) in natural frequency is ± 15%, the power transmission efficiency is 5%. That is, by setting the natural frequency of each power transmitting unit and the power receiving unit such that the absolute value (difference in natural frequency) of the deviation (%) of the natural frequency falls within the range of 10% or less of the natural frequency of the power receiving unit 96. It can be seen that the power transmission efficiency can be increased. Furthermore, the power transmission efficiency can be further improved by setting the natural frequency of each power transmission unit and the power receiving unit so that the absolute value of the deviation (%) of the natural frequency is 5% or less of the natural frequency of the power receiving unit 96. I understand that I can do it. As simulation software, electromagnetic field analysis software (JMAG (registered trademark): manufactured by JSOL Corporation) is employed.

Next, the operation of the power transmission system according to the present embodiment will be described.
In FIG. 1, AC power is supplied to the electromagnetic induction coil 23 from the high frequency power driver 22. When a predetermined alternating current flows through the electromagnetic induction coil 23, an alternating current also flows through the resonance coil 24 by electromagnetic induction. At this time, electric power is supplied to the electromagnetic induction coil 23 so that the frequency of the alternating current flowing through the resonance coil 24 becomes a specific frequency.

  When a current having a specific frequency flows through the resonance coil 24, an electromagnetic field that vibrates at the specific frequency is formed around the resonance coil 24.

  The resonance coil 11 is disposed within a predetermined range from the resonance coil 24, and the resonance coil 11 receives electric power from an electromagnetic field formed around the resonance coil 24.

  In the present embodiment, so-called helical coils are employed for the resonance coil 11 and the resonance coil 24. For this reason, a magnetic field that vibrates at a specific frequency is mainly formed around the resonance coil 24, and the resonance coil 11 receives electric power from the magnetic field.

  Here, a magnetic field having a specific frequency formed around the resonance coil 24 will be described. The “specific frequency magnetic field” typically has a relationship with the power transmission efficiency and the frequency of the current supplied to the resonance coil 24. First, the relationship between the power transmission efficiency and the frequency of the current supplied to the resonance coil 24 will be described. The power transmission efficiency when power is transmitted from the resonance coil 24 to the resonance coil 11 varies depending on various factors such as the distance between the resonance coil 24 and the resonance coil 11. For example, the natural frequency (resonance frequency) of the power transmission unit 28 and the power reception unit 27 is the natural frequency f0, the frequency of the current supplied to the resonance coil 24 is the frequency f3, and the air gap between the resonance coil 11 and the resonance coil 24 is Air gap AG.

  FIG. 4 is a graph showing the relationship between the power transmission efficiency and the frequency f3 of the current supplied to the resonance coil 24 when the air gap AG is changed with the natural frequency f0 fixed.

  In the graph shown in FIG. 4, the horizontal axis indicates the frequency f3 of the current supplied to the resonance coil 24, and the vertical axis indicates the power transmission efficiency (%). The efficiency curve L1 schematically shows the relationship between the power transmission efficiency when the air gap AG is small and the frequency f3 of the current supplied to the resonance coil 24. As shown in the efficiency curve L1, when the air gap AG is small, the peak of power transmission efficiency occurs at frequencies f4 and f5 (f4 <f5). When the air gap AG is increased, the two peaks when the power transmission efficiency is increased change so as to approach each other. As shown in the efficiency curve L2, when the air gap AG is made larger than a predetermined distance, the peak of the power transmission efficiency is one, and the power transmission efficiency is increased when the frequency of the current supplied to the resonance coil 24 is the frequency f6. It becomes a peak. When the air gap AG is further increased from the state of the efficiency curve L2, the peak of power transmission efficiency is reduced as shown by the efficiency curve L3.

  For example, the following first method can be considered as a method for improving the power transmission efficiency. As a first method, the power transmission unit 28 and the power reception unit are changed by changing the capacitances of the capacitors 25 and 19 while keeping the frequency of the current supplied to the resonance coil 24 shown in FIG. 27, a method of changing the characteristic of the power transmission efficiency with the terminal 27 can be considered. Specifically, the capacitances of the capacitor 25 and the capacitor 19 are adjusted so that the power transmission efficiency reaches a peak in a state where the frequency of the current supplied to the resonance coil 24 is constant. In this method, the frequency of the current flowing through the resonance coil 24 and the resonance coil 11 is constant regardless of the size of the air gap AG. As a method for changing the characteristics of the power transmission efficiency, a method using a matching unit provided between the power transmission device 41 and the high-frequency power driver 22, a method using the converter 14, or the like can be employed. .

  The second method is a method of adjusting the frequency of the current supplied to the resonance coil 24 based on the size of the air gap AG. For example, in FIG. 4, when the power transmission characteristic is the efficiency curve L <b> 1, a current having a frequency f <b> 4 or a frequency f <b> 5 is supplied to the resonance coil 24. When the frequency characteristic becomes the efficiency curves L2 and L3, a current having a frequency f6 is supplied to the resonance coil 24. In this case, the frequency of the current flowing through the resonance coil 24 and the resonance coil 11 is changed in accordance with the size of the air gap AG.

  In the first method, the frequency of the current flowing through the resonance coil 24 is a fixed constant frequency, and in the second method, the frequency flowing through the resonance coil 24 is a frequency that changes as appropriate depending on the air gap AG. A current having a specific frequency set so as to increase the power transmission efficiency is supplied to the resonance coil 24 by the first method, the second method, or the like. When a current having a specific frequency flows through the resonance coil 24, a magnetic field (electromagnetic field) that vibrates at the specific frequency is formed around the resonance coil 24. The power reception unit 27 receives power from the power transmission unit 28 through a magnetic field that is formed between the power reception unit 27 and the power transmission unit 28 and vibrates at a specific frequency. Therefore, the “magnetic field oscillating at a specific frequency” is not necessarily a magnetic field having a fixed frequency. In the above example, the frequency of the current supplied to the resonance coil 24 is set by paying attention to the air gap AG. However, the power transmission efficiency is the horizontal shift between the resonance coil 24 and the resonance coil 11. The frequency of the current supplied to the resonance coil 24 may be adjusted based on the other factors.

  In this embodiment, an example in which a helical coil is used as the resonance coil has been described. However, when an antenna such as a meander line is used as the resonance coil, a current having a specific frequency flows in the resonance coil 24. Thus, an electric field having a specific frequency is formed around the resonance coil 24. And electric power transmission is performed between the power transmission part 28 and the power receiving part 27 through this electric field.

  In the power transmission system according to the present embodiment, the efficiency of power transmission and power reception is improved by using a near field (evanescent field) in which the “electrostatic field” of the electromagnetic field is dominant. FIG. 5 is a diagram showing the relationship between the distance from the current source (magnetic current source) and the strength of the electromagnetic field. Referring to FIG. 5, the electromagnetic field is composed of three components. A curve k1 is a component inversely proportional to the distance from the wave source, and is referred to as a “radiating electric field”. A curve k2 is a component inversely proportional to the square of the distance from the wave source, and is referred to as an “induced electric field”. The curve k3 is a component that is inversely proportional to the cube of the distance from the wave source, and is referred to as an “electrostatic field”. When the wavelength of the electromagnetic field is “λ”, the distance at which the “radiation electric field”, the “induction electric field”, and the “electrostatic field” are approximately equal to each other can be expressed as λ / 2π.

  The “electrostatic field” is a region where the intensity of the electromagnetic wave suddenly decreases with the distance from the wave source. In the power transmission system according to the present embodiment, the near field (evanescent field) in which the “electrostatic field” is dominant is defined. Energy (electric power) is transmitted using this. That is, in the near field where the “electrostatic field” is dominant, by resonating the power transmitting unit 28 and the power receiving unit 27 (for example, a pair of LC resonance coils) having adjacent natural frequencies, the power transmitting unit 28 and the other power receiving unit 27 are resonated. Transmit energy (electric power) to Since this “electrostatic field” does not propagate energy far away, the resonance method can transmit power with less energy loss than electromagnetic waves that transmit energy (electric power) by “radiant electric field” that propagates energy far away. it can.

  As described above, in the power transmission system according to the present embodiment, power is transmitted from the power transmission device 41 to the power reception device by causing the power transmission unit 28 and the power reception unit 27 to resonate with the electromagnetic field. The coupling coefficient (κ) between the power transmission unit 28 and the power reception unit 27 is preferably 0.1 or less. Note that the coupling coefficient (κ) is not limited to this value, and may take various values that improve power transmission. Generally, in power transmission using electromagnetic induction, the coupling coefficient (κ) between the power transmission unit and the power reception unit is close to 1.0.

  For example, “magnetic resonance coupling”, “magnetic field (magnetic field) resonance coupling”, “electromagnetic field (electromagnetic field) resonance coupling”, or “electric field (electromagnetic field) resonance coupling” in the power transmission of the present embodiment. Electric field) Resonant coupling.

  The “electromagnetic field (electromagnetic field) resonance coupling” means a coupling including any of “magnetic resonance coupling”, “magnetic field (magnetic field) resonance coupling”, and “electric field (electric field) resonance coupling”.

  Since the resonance coil 24 of the power transmission unit 28 and the resonance coil 11 of the power reception unit 27 described in this specification employ a coil-shaped antenna, the power transmission unit 28 and the power reception unit 27 are mainly generated by a magnetic field. The power transmitting unit 28 and the power receiving unit 27 are “magnetic resonance coupled” or “magnetic field (magnetic field) resonant coupled”.

  For example, an antenna such as a meander line can be used as the resonance coils 24 and 11. In this case, the power transmission unit 28 and the power reception unit 27 are mainly coupled by an electric field. At this time, the power transmission unit 28 and the power reception unit 27 are “electric field (electric field) resonance coupled”.

  FIG. 6 is a perspective view showing the resonance coil 11 provided in the power receiving device 40 and members provided around the resonance coil 11. As shown in FIG. 6, the power receiving device 40 includes a resonance coil 11 and insulating paper 30 provided on the resonance coil 11. Note that the capacitor 19 is not shown in FIG. 6 and FIG.

  FIG. 7 is a perspective view showing a state in which the insulating paper 30 is removed from the state shown in FIG. As shown in FIG. 7, the resonance coil 11 includes a first end 31 and a second end 32, and the resonance coil 11 has a pitch P1 so as to surround the winding wire 33 around the winding center line O1. It is formed by opening and winding the conducting wire 33. The resonance coil 11 is formed to extend from the first end portion 31 toward the second end portion 32 so as to surround the winding center line O1 and away from the winding center line O1.

  In the example shown in FIG. 7, the resonance coil 11 is formed in a circular spiral shape when viewed from above the winding center line O1, but the resonance coil 11 is viewed from above on the winding center line O1. In this case, it may be formed in a polygonal vortex like a square vortex.

  8 is a cross-sectional view taken along line VIII-VIII in FIG. As shown in FIG. 8, in the cross section perpendicular to the extending direction of the resonance coil 11, the resonance coil 11 includes a first portion 35, a second portion 36, and a third portion 37 that are part of the resonance coil 11. Are arranged in a direction perpendicular to the winding center line O1. Note that the first portion 35, the second portion 36, and the third portion 37 are close to the winding center line O1 in this order.

  The pitch indicates a distance between the first portion 35 and the second portion 36 in a direction perpendicular to the winding center line O1 and a distance between the second portion 36 and the third portion 37. In the example shown in FIG. 8, the pitch between the first portion 35 and the second portion 36 is equal to the pitch between the second portion 36 and the third portion 37, and the resonance coil 11 has an equal pitch. It is formed by winding the conducting wire 33.

  In the example shown in FIG. 8, the arrangement direction of the first portion 35 and the second portion 36 from the first portion 35 toward the second portion 36, and the second portions 36 and 37 from the second portion 36 toward the third portion 37. And the arrangement direction coincide with each other in the arrangement direction D1. Note that the arrangement direction D1 and the direction of the pitch P1 match, but the directions do not necessarily have to match.

  The conducting wire 33 is formed to have a substantially rectangular shape in a cross section perpendicular to the extending direction of the resonance coil 11. Specifically, the conductive wire 33 includes a side surface 50 and a side surface 51 arranged in the thickness direction of the conductive wire 33, and an end surface 52 and an end surface 53 provided so as to connect the end portions of the side surface 50 and the side surface 51. . The end surface 52 and the end surface 53 are arranged in the extending direction of the winding center line O1.

  Then, the side surface 50 of the first portion 35 and the side surface 51 of the second portion 36 face each other with a pitch P1, and the side surface 50 of the second portion 36 and the side surface 51 of the third portion 37 open the pitch P1. Facing each other.

  Here, a virtual plane that is perpendicular to the arrangement direction D1 and is located closer to the winding center line O1 than the third portion 37 is referred to as a virtual plane 60. A virtual plane that extends parallel to the arrangement direction D1 and is spaced from the end face 53 is referred to as a virtual plane 61.

  Then, the side surface 51 is projected onto the imaginary plane 60 in the arrangement direction D1 from a position on the side opposite to the winding center line O1 with respect to the side surface 51. At this time, the length of the projection portion of the side surface 51 in the winding center line O1 direction is defined as a length L4. Further, the end surface 52 is projected onto the virtual plane 61 in a direction perpendicular to the arrangement direction D1 from a position located on the opposite side of the end surface 53 with respect to the end surface 52. The length of the projection unit in the direction perpendicular to the winding center line O1 is defined as a length L5.

  Here, as is apparent from FIG. 8, the length L4 is larger than the length L5. For this reason, the resonance coil 11 has a large opposing area with a pitch P1 therebetween, so that the capacitance formed in the resonance coil 11 increases. The length L4 is the width of the conducting wire 33, and the length L5 is the thickness of the conducting wire 33. In addition, although the example which employ | adopted the rectangular-shaped conducting wire as a cross-sectional shape of the conducting wire 33 was demonstrated, as a cross-sectional shape of the conducting wire 33, it is not restricted to such a shape. For example, various shapes such as a circular shape, an elliptical shape, and a polygonal shape can be adopted as the cross-sectional shape of the conducting wire 33.

  In the resonance coil 11 thus formed, a region sandwiched between the first portion 35 and the second portion 36 is defined as a region R1. Similarly, a region sandwiched between the second portion 36 and the third portion 37 is defined as a region R2. Further, a region other than the region R1 and the region R2 is defined as a region R3.

  9 is a cross-sectional view taken along line IX-IX shown in FIG. FIG. 9 is a cross-sectional view in a direction perpendicular to the extending direction of the resonance coil 11. As shown in FIG. 9, the resonance coil 11 is provided with insulating paper 30.

  The insulating paper 30 includes side portions 62 and side portions 63 arranged in the arrangement direction D1 and a connection portion 64 connecting the side portions 62 and the side portions 63 in a cross section perpendicular to the extending direction of the resonance coil 11. The insulating paper 30 is formed from a deformable insulating material. The side parts 62 and 63 and the connection part 64 are also made of a material that can be bent or bent. For this reason, the side parts 62 and 63 and the connection part 64 may have a wall surface shape or a curved surface shape when attached to the resonance coil 11.

  The side portion 62 and the side portion 63 are arranged so as to sandwich the conducting wire 33, and the side portion 62 and the side portion 63 extend in the extending direction of the resonance coil 11. The connection portion 64 also covers the end surface 53 of the conducting wire 33 and extends in the direction in which the resonance coil 11 extends. As is clear from FIG. 6, the insulating paper 30 is arranged over the entire length of the resonance coil 11 so as to reach the second end 32 from the first end 31 of the resonance coil 11.

  Here, the configuration of the insulating paper 30 will be described in detail. 9 and 6, the side portion 62 is disposed so as to cover the side surface 51, and the side portion 63 is disposed so as to cover the side surface 50. Similarly, the connection part 64 is arrange | positioned so that the end surface 53 may be covered.

  In FIG. 9, attention is focused on a portion of the insulating paper 30 that covers the first portion 35. A portion of the insulating paper 30 that covers the first portion 35 includes a side portion 62a, a side portion 63a, and a connection portion 64a that connects the side portion 62a and the side portion 63a. Similarly, the portion of the insulating paper 30 that covers the second portion 36 includes a side portion 62b, a side portion 63b, and a connecting portion 64b that connects the side portion 62a and the side portion 63b. Of these, the portion covering the third portion 37 includes a side portion 62c, a side portion 63c, and a connecting portion 64c that connects the side portion 62c and the side portion 63c. Note that the side part 62a, the side part 62b, and the side part 62c all extend in the direction in which the resonance coil 11 extends, and each end part is connected. Similarly, the side part 63a, the side part 63b, and the side part 63c all extend in the direction in which the resonance coil 11 extends, and the respective end parts are connected.

  Here, the side portion 62 a is provided so as to cover the side surface 51 of the conducting wire 33. The side portion 63a enters the region R1 from the region R3, passes through the region R1, and is drawn out to the region R3. Thus, the side part 62a protrudes from the region R1 to the outside of the region R1. And the side part 63a is connected to the connection part 64 by area | region R3. The side part 63a is formed so as to protrude outward from the end face 52 from between the first part 35 and the second part 36.

  The side portion 62b enters the region R1 from the region R3, passes through the region R1, and is drawn out to the region R3. The side portion 62b is connected to the connection portion 64b in the region R3. The side portion 63b is formed in the same manner as the side portion 63a, and the side portion 63b is provided so as to enter the region R2 from the region R3 and to be drawn out to the region R3 through the region R2. The side part 63b is connected to the connection part 64b in the region R3. The side part 63 b and the side part 62 b protrude outward from the end face 52 from between the second part 36 and the third part 37.

  The side portion 62c enters the region R2 from the region R3, passes through the region R2, and is drawn out to the region R3. And the side part 62c is connected to the connection part 64c in area | region R3. The side part 62c protrudes outward from the end face 52.

  Thus, the first portion 35 and the second portion 36 are insulated by the side portion 63a and the side portion 62b. Furthermore, since the side part 63a and the side part 62b are drawn out from between the first part 35 and the second part 36, the creeping distance between the first part 35 and the second part 36 becomes longer. Yes. For this reason, even if an electric current flows in the resonance coil 11 at the time of electric power transmission, it can suppress that discharge arises between the 1st part 35 and the 2nd part 36. FIG.

  Furthermore, since the end surface 53 of the first portion 35 is covered with the connection portion 64a, and the end surface 53 of the second portion 36 is also covered with the connection portion 64b, the end portion 53 is between the first portion 35 and the second portion 36. The occurrence of discharge is suppressed.

  Similarly, an insulation distance is secured between the second portion 36 and the third portion 37 by the side portion 63b and the side portion 62c, and the end surfaces 53 of the second portion 36 and the third portion 37 are connected to each other. Since it is covered with the parts 64b and 64c, the occurrence of discharge between the second part 36 and the third part 37 is suppressed.

  Here, the side parts 62a to 62c and the side parts 63a to 63c are projected onto the virtual plane 60 in the arrangement direction D1. The length in the direction perpendicular to the arrangement direction D1 of the projection parts at this time is defined as a length LL1. This length LL1 is longer than the length L4.

  Furthermore, the part which protrudes from the end surface 52 among the side parts 62a-side part 62c and the side parts 63a-63c is projected on the virtual plane 60 in the arrangement direction D1. The length of the projection unit in the direction perpendicular to the arrangement direction D1 is defined as a length LL2. This length LL2 is, for example, not more than length L4 and not less than half of length L4. If the length by which the side portion 63 or the like protrudes is longer than the length L4, the insulating paper 30 may come into contact with the surrounding members and breakage may occur. Furthermore, if the protruding length is shorter than half the length L4, the creeping distance is shortened.

  The side surface 50 of the third portion 37 defines the inner peripheral surface of the resonance coil 11, and the side surface 50 of the third portion 37 is covered with the side portion 63 c. Further, the side surface 50 of the first portion 35 is covered with the side portion 62a. For this reason, most of the resonance coil 11 is covered with the insulating paper 30, and the occurrence of discharge between the resonance coil 11 and an external member is suppressed.

  As described above, according to the power receiving device 40 according to the first embodiment, it is possible to suppress discharge from occurring in the resonance coil 11.

  Next, the resonance coil 24 provided in the power transmission device 41 and the insulating paper provided in the resonance coil 24 will be described. The resonance coil 24 of the power transmission device 41 and the insulating paper provided in the resonance coil 24 are basically the same configuration as the resonance coil 11 provided in the power receiving device 40 and the insulation paper provided in the resonance coil 11. It has become.

  FIG. 10 is a perspective view showing the resonance coil 24 and insulating paper provided on the resonance coil 24. In FIG. 10 and FIG. 11 described later, the capacitor 25 is not shown. As shown in FIG. 10, a resonance coil 24 and an insulating paper 130 provided on the resonance coil 24 are included.

  FIG. 11 is a perspective view showing a state in which the insulating paper 130 is removed from the state shown in FIG. As shown in FIG. 11, the resonance coil 24 includes a third end 131 and a fourth end 132, and the resonance coil 24 has a pitch P2 so as to surround the winding wire 133 around the winding center line O2. It is formed by winding the conductive wire 133 with a gap. Note that the resonance coil 24 is formed so as to extend around the winding center line O2 and away from the winding center line O2 from the third end 131 toward the fourth end 132.

  In the example shown in FIG. 11, when the resonance coil 24 is viewed in plan from the winding center line O2, the resonance coil 24 is formed in a circular vortex, but it resonates from the winding center line O2. When the coil 24 is viewed in plan, it may be formed in a polygonal vortex shape such as a square vortex shape.

  12 is a cross-sectional view taken along line XII-XII shown in FIG. As shown in FIG. 12, in the cross section perpendicular to the extending direction of the resonance coil 24, the resonance coil 24 includes a fourth portion 135, a fifth portion 136, and a sixth portion 137 that are part of the resonance coil 24. Are arranged in a direction perpendicular to the winding center line O2. The fourth portion 135, the fifth portion 136, and the sixth portion 137 are arranged in this order so as to be close to the winding center line O2.

  In the resonance coil 24, the pitch is the distance between the fourth portion 135 and the fifth portion 136 in the direction perpendicular to the winding center line O2, and the distance between the fifth portion 136 and the sixth portion 137. Indicates distance. Note that the pitch between the fourth portion 135 and the fifth portion 136 is equal to the pitch between the fifth portion 136 and the sixth portion 137, and the resonance coil 24 winds the conducting wire 133 at an equal pitch. Is formed.

  In the example shown in FIG. 12, the arrangement direction of the fourth portion 135 and the fifth portion 136 from the fourth portion 135 toward the fifth portion 136 and the fifth direction from the fifth portion 136 toward the sixth portion 137 are shown. The arrangement direction of the part 136 and the sixth part 137 is the same, and both are in the arrangement direction D2. In addition, although the direction of arrangement direction D2 and the direction of pitch P2 correspond, each direction does not necessarily need to correspond.

  The conducting wire 133 is formed to have a substantially rectangular shape in a cross section perpendicular to the extending direction of the resonance coil 24. Specifically, the conductive wire 133 includes a side surface 150 and a side surface 151 arranged in the thickness direction, and an end surface 152 and an end surface 153 provided so as to connect the end portions of the side surface 150 and the side surface 151.

  The end surface 152 and the end surface 153 are arranged in the extending direction of the winding center line O2. The side surface 150 of the fourth portion 135 and the side surface 151 of the fifth portion 136 are opposed to each other with a pitch P2, and the side surface 150 of the fifth portion 136 and the side surface 151 of the sixth portion 137 are the pitch P2. Opposite to each other.

  Here, a virtual plane that is perpendicular to the arrangement direction D <b> 2 and that is disposed closer to the winding center line O <b> 2 than the sixth portion 137 is referred to as a virtual plane 160. A virtual plane that extends parallel to the arrangement direction D2 and is spaced from the end surface 153 is referred to as a virtual plane 161.

  Then, the side surface 151 is projected onto the imaginary plane 160 in the arrangement direction D2 from the position opposite to the winding center line O2 with respect to the side surface 151. At this time, the length of the side surface 151 in the direction perpendicular to the arrangement direction D2 of the projection portions is defined as a length L6. The end surface 152 is projected onto the virtual plane 161 in a direction perpendicular to the arrangement direction D2 from a position located on the opposite side of the end surface 153 with respect to the end surface 152. The length of the projection unit in the arrangement direction D2 is defined as a length L7. Here, as is clear from FIG. 12, the length L6 is longer than the length L7.

  For this reason, the resonance coil 24 has a large area facing each other with a pitch P2, and the capacitance formed in the resonance coil 24 is large. The length L6 is the width of the conducting wire 133, and the length L7 is the thickness of the conducting wire 133. Here, the conductor 133 can also have various cross-sectional shapes.

  In the resonance coil 24 formed in this manner, a region sandwiched between the fourth portion 135 and the fifth portion 136 is defined as a region R4. Similarly, a region sandwiched between the fifth portion 136 and the sixth portion 137 is referred to as a region R5. Furthermore, a region other than the region R4 and the region R5 is defined as a region R6.

  13 is a cross-sectional view taken along line XIII-XIII shown in FIG. In the example shown in FIG. 13, the insulating coil 130 is provided in the resonance coil 24.

  The insulating paper 130 includes a side portion 162 and a side portion 163 arranged in the arrangement direction D2 and a connection portion 164 connecting the side portion 162 and the side portion 163 in a cross section perpendicular to the extending direction of the resonance coil 24. The side part 162 and the side part 163 are arranged so as to sandwich the conducting wire 133, and the side part 162 and the side part 163 extend in the extending direction of the resonance coil 24. The connection part 164 covers the end surface 153 and extends in the direction in which the resonance coil 24 extends. As is clear from FIG. 10, the insulating paper 130 is arranged over the entire length of the resonance coil 24 so as to reach the fourth end 132 from the third end 131 of the resonance coil 24.

  Next, the configuration of the insulating paper 130 will be described in detail. 13 and 10, the side portion 162 is disposed so as to cover the side surface 151, and the side portion 163 is provided so as to cover the side surface 150. The connection part 164 is arrange | positioned so that the end surface 153 may be covered. The insulating paper 130 is made of a deformable insulating material. The side portions 162 and 163 and the connecting portion 164 are also made of a material that can be bent or bent. For this reason, the side parts 162 and 163 and the connection part 164 may have a wall surface shape or a curved surface shape when mounted on the resonance coil 24.

  In FIG. 13, attention is focused on the portion of the insulating paper 130 that covers the fourth portion 135. The portions of the insulating paper 130 that cover the fourth portion 135 are the side portion 162 a that covers the side surface 151 of the fourth portion 135, the side portion 163 a that covers the side surface 150 of the fourth portion 135, the side portion 162 a, and the side portion 163 a. And the connection portion 164a is provided so as to cover the end surface 153 of the fourth portion 135.

  The side part 163a enters the region R4 from the region R6 and passes through the region R4. Further, the side portion 163a is disposed so as to enter the region R6 after passing through the region R4.

  Of the insulating paper 130, the portion covering the fifth portion 136 includes a side portion 162 b that covers the side surface 151 of the fifth portion 136, a side portion 163 b that covers the side surface 150 of the fifth portion 136, a side portion 162 b, and a side portion 163 b. And the connecting portion 164b is provided so as to cover the end surface 153 of the fifth portion 136.

  The side portion 162b enters the region R4 from the region R6 and passes through the region R4. Further, the side portion 162b of the insulating paper 130 is drawn from the region R4 to the region R6. Further, the side portion 163b enters the region R5 from the region R6. The side portion 163b passes through the region R5 and reaches the region R6.

  A portion of the insulating paper 130 that covers the sixth portion 137 includes a side portion 162 c that covers the side surface 151 of the sixth portion 137, a side portion 163 c that covers the side surface 150, and a connection portion 164 c that covers the end surface 153. The side portion 162c enters the region R5 from the region R6, and the side portion 162c is drawn from the region R5 to the region R6.

  For this reason, since the side part 163a and the side part 162b are arrange | positioned between the 4th part 135 and the 5th part 136, the insulation between the 4th part 135 and the 5th part 136 is ensured. Has been.

  The end surface 153 of the fourth portion 135 and the fifth portion 136 is covered with the connection portion 164a and the connection portion 164b, and the side portion 163a and the side portion 162b protrude from the end surface 152 into the region R6. The creepage distance between the first portion 136 and the fifth portion 136 is longer.

  Similarly, since the side part 163b and the side part 162c are disposed between the fifth part 136 and the sixth part 137, the insulation between the fifth part 136 and the sixth part 137 is improved. It is secured.

  End surfaces 153 of the fifth portion 136 and the sixth portion 137 are covered with the connection portions 164b and 164c, and the side portions 163b and 162c are arranged so as to protrude from the end surface 152 into the region R6. Therefore, the creeping distance between the fifth portion 136 and the sixth portion 137 is long. For this reason, also in the resonance coil 24, it is suppressed that discharge arises between pitches.

  Here, a virtual plane that is located on the winding center line O2 side of the sixth portion 137 and extends in a direction perpendicular to the arrangement direction D2 is defined as a virtual plane 160. The sixth portion 137 is projected onto the virtual plane 160 from the position on the opposite side of the winding center line O2 with respect to the sixth portion 137 in the arrangement direction D2. At this time, the length in the direction extending in a direction perpendicular to the arrangement direction D2 of the projection units is defined as a length L16.

  Similarly, the insulating paper 130 is projected onto the virtual plane 160. At this time, the length of the projection unit in the direction perpendicular to the arrangement direction D2 is defined as a length LL3. As can be seen from FIG. 13, the length LL3 of the insulating paper 130 is longer than the length L16 of the conducting wire 133. Here, the length LL3 indicates the width of the insulating paper 130, and the length L16 indicates the width of the conducting wire 133.

  As described above, the width of the insulating paper 130 is formed to be larger than the width of the conducting wire 133. Here, a portion of the insulating paper 130 that protrudes from the end surface 152 is projected onto the virtual plane 160. At this time, the length of the projection unit in the direction perpendicular to the arrangement direction D2 is defined as a length LL4. This length LL4 is not less than half of the length L16 and smaller than the length L16. By setting the length LL4 to such a length, a creepage distance between the fourth portion 135, the fifth portion 136, and the sixth portion 137 can be ensured.

(Embodiment 2)
A power receiving device and a power transmitting device according to the second embodiment will be described with reference to FIGS. 14 to 21. Of the configurations shown in FIGS. 14 to 21, configurations that are the same as or correspond to the configurations shown in FIGS. 1 to 13 are given the same reference numerals, and descriptions thereof may be omitted.

  FIG. 14 is a perspective view showing the resonance coil 11 provided in the power receiving device 40 and the insulating paper provided in the resonance coil 11. As shown in FIG. 14, the resonance coil 11 is covered with insulating paper 230.

  FIG. 15 is a perspective view showing a state in which the insulating paper 230 is removed from the state shown in FIG. As shown in FIG. 15, the resonance coil 11 includes a first end 231 and a second end 232. Here, as the resonance coil 11 extends from the first end 231 toward the second end 232, the resonance coil 11 extends so as to surround the winding center line O3 and is displaced in the extending direction of the winding center line O3. The conductive wire 233 is wound around. The resonance coil 11 is formed by winding a conducting wire 233 with a pitch P3. The direction of the pitch P3 is the direction in which the winding center line O3 extends.

  16 is a cross-sectional view taken along line XVI-XVI shown in FIG. As shown in FIG. 16, in the cross section perpendicular to the extending direction of the resonance coil 11, the resonance coil 11 has a first portion 235, a second portion 236, and a third portion 237 having a pitch P3 in the arrangement direction D3. Open and arranged. In the third embodiment, the arrangement direction D3 and the extending direction (pitch direction) of the winding center line O3 coincide with each other, but the directions do not necessarily coincide with each other.

  The conducting wire 233 is formed in a rectangular shape. Specifically, the conductive wire 233 includes a side surface 250 and a side surface 251 arranged in the thickness direction, and an end surface 252 and an end surface 253 arranged so as to connect the end portions of the side surface 250 and the side surface 251. The end surface 252 and the end surface 253 are arranged in a direction perpendicular to the winding center line O3, and the end surface 253 is disposed on the opposite side of the winding center line O3 with respect to the end surface 252.

  The side surface 250 of the first portion 235 and the side surface 251 of the second portion 236 face each other with a pitch P3. The side surface 250 of the second portion 236 and the side surface 251 of the third portion 237 face each other with a pitch P3. Each end surface 252 is disposed on the winding center line O3 side with respect to the end surface 253, and forms the inner peripheral surface of the resonance coil 11.

  Here, a virtual plane located on the opposite side of the winding center line O3 with respect to the end surface 253 and parallel to the arrangement direction D3 is defined as a virtual plane 260. A virtual plane that is located on the opposite side of the first portion 235 with respect to the third portion 237 and is perpendicular to the arrangement direction D3 is defined as a virtual plane 261.

  Then, the side surface 251 is projected onto the virtual plane 261 in the arrangement direction D3. The length of the projection part in the direction perpendicular to the arrangement direction D3 is defined as a length L8. The end face 252 is projected onto the virtual plane 260 in a direction perpendicular to the arrangement direction D3 from a position located on the opposite side of the end face 253 with respect to the end face 252. At this time, the length of the projection unit in the arrangement direction D3 is defined as a length L9.

  As is apparent from FIG. 16, the length L8 is longer than the length L9. For this reason, also in the resonance coil 11 according to the third embodiment, a large capacitance is formed in the resonance coil 11.

  Here, a region sandwiched between the first portion 235 and the second portion 236 is a region R7, and a region sandwiched between the second portion 236 and the third portion 237 is a region R8. Further, a region other than the region R8 and the region R7 is defined as a region R9.

  In FIG. 14, the insulating paper 230 is disposed over the entire length of the resonance coil 11 so as to reach the second end 232 from the first end 231 of the resonance coil 11 formed as described above.

  17 is a cross-sectional view taken along line XVII-XVII shown in FIG. In FIG. 17, the insulating paper 230 includes a side portion 262 that covers the side surface 251 of the conducting wire 233, a side portion 263 that covers the side surface 250, and a connection portion 264 that connects the side portion 262 and the side portion 263. Here, the side portion 262 and the side portion 263 are arranged so as to sandwich the conducting wire 233, and the side portion 262 and the side portion 263 extend in the extending direction of the conducting wire 233. The connecting portion 264 is provided so as to cover the end surface 253 and extends in the extending direction of the resonance coil 24.

  The insulating paper 230 is disposed so as to reach the second end 232 from the first end 231 of the resonance coil 11, and the insulating paper 230 is disposed over substantially the entire circumference of the resonance coil 11.

  Attention is paid to a portion of the insulating paper 230 that covers the first portion 235 and the second portion 236. Here, the side surface 250 of the first portion 235 is covered with the side portion 263a, and the side surface 251 of the second portion 236 is covered with the side portion 262b.

  In addition, the side part 262a, the side part 262b, and the side part 262c which cover the side surface 251 of the 1st part 235, the 2nd part 236, and the 3rd part 237 are integrally formed. The side portion 263a, the side portion 263b, and the side portion 263c that cover the side surfaces 250 of the first portion 235, the second portion 236, and the third portion 237 are integrally formed.

  The side portion 263a and the side portion 262b are formed so as to enter the region R7 from the region R9 and pass through the region R7 to reach the region R9.

  Furthermore, the end surface 253 of the first portion 235 is covered with the connection portion 264a, and the end surface 253 of the second portion 236 is covered with the connection portion 264b.

  For this reason, the creepage distance between the 1st part 235 and the 2nd part 236 is long, and it is suppressed that a discharge arises between the 1st part 235 and the 2nd part 236.

  Further, since the side portion 263a and the side portion 262b are disposed between the first portion 235 and the second portion 236, insulation between the first portion 235 and the second portion 236 is ensured. Yes.

  Next, attention is paid to a portion of the insulating paper 230 that covers the second portion 236 and the third portion 237. The side surface 250 of the second portion 236 is covered with the side portion 263b, and the side surface 251 of the third portion 237 is covered with the side portion 262c.

  The side portion 263b and the side portion 262c enter the region R8 from the region R9, pass through the region R8, and are drawn out to the region R9. Furthermore, the end surface 253 of the second portion 236 is covered with the connection portion 264b, and the end surface 253 of the third portion 237 is covered with the connection portion 264c.

  For this reason, the creeping distance between the 2nd part 236 and the 3rd part 237 is long, and it is suppressed that discharge arises between the 2nd part 236 and the 3rd part 237. Moreover, since the side part 263b and the side part 262c are arrange | positioned between the 2nd part 236 and the 3rd part 237, the insulation between the 2nd part 236 and the 3rd part 237 is ensured. Yes.

  Here, the virtual plane 261 is projected on the insulating paper 230 in the arrangement direction D3. The length of the projection unit in the direction perpendicular to the arrangement direction D3 is defined as a length LL5. Similarly, a portion of the insulating paper 230 that protrudes from the end face 252 is projected onto the virtual plane 261 in the arrangement direction D3. The length of the projection unit in the direction perpendicular to the arrangement direction D3 is LL6.

  Here, in FIG. 17, the width of the conducting wire 233 is the length L8, and the width of the insulating paper 230 is the length LL5. Here, the length LL5 is longer than the length L8. Furthermore, the length LL5 is not less than half the length L8, and the length LL5 is smaller than the length L8.

  Thus, also in the power receiving device 40 according to the present embodiment, the occurrence of discharge in the resonance coil 11 is suppressed.

  Next, the resonance coil 24 provided in the power transmission device 41 and the insulating paper provided in the resonance coil 24 will be described.

  FIG. 18 is a perspective view showing the resonance coil 24 and the insulating paper provided in the resonance coil 24. As shown in FIG. 18, the resonance coil 24 is provided with insulating paper 330.

  FIG. 19 is a perspective view showing a state in which the insulating paper 330 is removed from the state shown in FIG. As shown in FIG. 19, the resonance coil 24 includes a third end 331 and a fourth end 332. The resonance coil 24 extends so as to surround the winding center line O4 and move in the extending direction of the winding center line O4 from the third end 331 toward the fourth end 332 so as to be displaced in the extending direction of the winding center line O4. It is formed by bending. The resonance coil 24 is formed by bending the conductive wire 333 with a pitch P4. The direction of the pitch P4 is the direction in which the winding center line O4 extends.

  20 is a cross-sectional view taken along line XX-XX shown in FIG. As shown in FIG. 20, in the cross section in the direction perpendicular to the extending direction of the resonance coil 24, the resonance coil 24 includes the fourth portion 335, the fifth portion 336, and the sixth portion 337 arranged in the arrangement direction D4. including.

  The arrangement direction D4 and the direction in which the winding center line O4 extends coincide with each other, but do not necessarily coincide with each other.

  In a cross section perpendicular to the extending direction of the resonance coil 24, the conducting wire 333 is formed to have a substantially rectangular shape.

  Specifically, side surface 350 and side surface 351 arranged in the thickness direction of conductive wire 333, and end surface 352 and end surface 353 provided to connect the end portions of side surface 350 and side surface 351 are included. The end surface 352 and the end surface 353 are arranged in a direction perpendicular to the winding center line O4, the fourth portion 335 faces the winding center line O4, and the end surface 353 is disposed on the opposite side of the end surface 353. Has been.

  The side surface 350 of the fourth portion 335 and the side surface 351 of the fifth portion 336 are opposed to each other, and the side surface 350 of the fifth portion 336 and the side surface 351 of the sixth portion 337 are opposed to each other.

  The end surface 352 is disposed closer to the winding center line O4 than the end surface 353. The end surface 352 defines the inner peripheral surface of the resonance coil 24, and the end surface 353 defines the outer peripheral surface of the resonance coil 24.

  Here, a virtual plane located on the opposite side of the winding center line O4 with respect to the end surface 353 and parallel to the arrangement direction D4 is defined as a virtual plane 360. A virtual plane located on the opposite side of the sixth portion 337 from the fourth portion 335 and perpendicular to the arrangement direction D4 is defined as a virtual plane 361.

  Then, the side surface 351 is projected onto the virtual plane 361 in the arrangement direction D4. The length of the projection part in the direction perpendicular to the arrangement direction D4 is defined as a length L10. The end surface 352 is projected onto the virtual plane 360 in a direction perpendicular to the arrangement direction D4 from a position located on the opposite side of the end surface 353 with respect to the end surface 352. The length of this projection part in the arrangement direction D4 is defined as a length L11.

  As is clear from FIG. 20, the length L10 is longer than the length L11. For this reason, a large capacitance is also formed in the resonance coil 24 according to the second embodiment.

  Here, a region sandwiched between the fourth portion 335 and the fifth portion 336 is referred to as a region R10. Similarly, a region sandwiched between the fifth portion 336 and the sixth portion 337 is referred to as a region R11. A region other than the region R10 and the region R11 is defined as a region R12.

  21 is a cross-sectional view taken along line XXI-XXI shown in FIG. As shown in FIG. 21, the insulating paper 330 covers the side surface 351 of the conducting wire 333, covers the side portion 362 extending in the extending direction of the resonance coil 24, the connection portion 364 covering the end surface 353, and the side surface 350, And a side portion 363 extending in the extending direction of the resonance coil 24.

  The side portion 362a, the side portion 362b, and the side portion 362c that cover the side surfaces 351 of the fourth portion 335, the fifth portion 336, and the sixth portion 337 are integrally formed. The side portion 363a, the side portion 363b, and the side portion 363c that cover the side surfaces 350 of the fourth portion 335, the fifth portion 336, and the sixth portion 337 are integrally formed.

  Here, attention is paid to a portion of the insulating paper 330 that covers the fourth portion 335 and the fifth portion 336. The side portion 363a and the side portion 362b enter the region R10 from the region R12, pass through the region R10, and are drawn out to the region R12. Furthermore, the end surface 353 of the fourth portion 335 is covered with the connection portion 364a, and the end surface 353 of the fifth portion 336 is covered with the connection portion 364b.

  For this reason, the creeping distance between the 4th part 335 and the 5th part 336 is long, and it can suppress that discharge arises between the 4th part 335 and the 5th part 336. FIG. Since the side portion 363a and the side portion 362b are disposed between the fourth portion 335 and the fifth portion 336, insulation between the fourth portion 335 and the fifth portion 336 is ensured.

  Next, attention is focused on a portion of the insulating paper 330 that covers the fifth portion 336 and the sixth portion 337. The side portion 363b and the side portion 362c enter the region R11 from the region R12, pass through the region R11, and are drawn out to the region R12. Furthermore, the end surface 353 of the fifth portion 336 is covered with the connection portion 364b, and the end surface 353 of the sixth portion 337 is covered with the connection portion 364c.

  For this reason, the creepage distance between the 5th part 336 and the 6th part 337 is long, and it is suppressed that discharge arises between the 5th part 336 and the 6th part 337. Further, the side portion 363b and the side portion 362c are disposed between the fifth portion 336 and the sixth portion 337, and insulation between the fifth portion 336 and the sixth portion 337 is ensured. Yes.

  Thus, also in the resonance coil 24 according to the second embodiment, the occurrence of discharge between pitches is suppressed.

  Here, the insulating paper 330 is projected onto the virtual plane 361 in the arrangement direction D4. A length LL7 in a direction perpendicular to the arrangement direction D4 of the projection units is set. And the part which protrudes from the end surface 352 among the insulating paper 330 is projected on the virtual plane 361 in the arrangement direction D4. The length of the projection unit in the direction perpendicular to the arrangement direction D4 is defined as a length LL8. The length LL8 is longer than the length L10. The length LL8 is not less than half of the length L10 and shorter than the length L10.

(Embodiment 3)
A power receiving device 40 and a power transmitting device 41 according to the third embodiment will be described with reference to FIGS. 22 to 23. Of the configurations shown in FIGS. 22 to 23, configurations that are the same as or correspond to the configurations shown in FIGS. 1 to 21 may be given the same reference numerals and explanation thereof may be omitted.

  FIG. 22 is a perspective view showing the resonance coil 11 provided in the power receiving unit 27 and the insulating paper provided in the resonance coil 11.

  As shown in FIG. 22, the resonance coil 11 includes the first end 31 and is formed by winding a conducting wire 33 in a spiral shape around the winding center line O1, as in the first embodiment. ing.

  The insulating paper 430 includes a plurality of unit insulating papers 444A to 444C, and the unit insulating paper 444A, the unit insulating paper 444B, and the unit insulating paper 444C are arranged in the length direction of the resonance coil 11.

  Specifically, the unit insulating paper 444A is disposed between the second end 32 and a portion of the resonance coil 11 that is adjacent to the second end 32 with a pitch. . The unit insulating paper 444C is disposed between the first end portion 31 and a portion of the resonance coil 11 that is adjacent to the first end portion 31 with a pitch. The unit insulating paper 444B is disposed in a portion of the resonance coil 11 positioned between the unit insulating paper 444C and the unit insulating paper 444A.

  Here, FIG. 23 is a cross-sectional view taken along line XXIII-XXIII shown in FIG. As shown in FIG. 23, the unit insulating paper 444 includes a side portion 462a that covers the side surface 51 of the first portion 35, a side portion 463a that covers the side surface 50, an end portion of the side portion 462a, and an end portion of the side portion 463. And a connecting portion 464a provided so as to cover the end surface 53 of the first portion 35.

  The unit insulating paper 444B connects the side portion 462b covering the side surface 51 of the second portion 36, the side portion 463b covering the side surface 50 of the second portion 36, and the end portion of the side portion 462b and the end portion of the side portion 463b. And a connecting portion 464b provided to cover the end surface 52 of the second portion 36.

  The unit insulating paper 444C connects the side portion 462c covering the side surface 51 of the third portion 37, the side portion 463c covering the side surface 51 of the third portion 37, and the end portion of the side portion 462c and the end portion of the side portion 463c. And a connecting portion 464c provided so as to cover the end surface 53 of the third portion 37.

  As shown in FIG. 23, the side portion 463a and the side portion 462b enter the region R1 from the region R3, pass through the region R1, and are drawn out to the region R3. Further, the side portion 463b and the side portion 462c enter the region R2 from the region R3, pass through the region R2, and are further drawn out to the region R3.

  For this reason, also in the resonance coil 11 according to the third embodiment, the occurrence of discharge at the pitch P1 of the resonance coil 11 is suppressed.

  Furthermore, the end surface 52 of the first portion 35 is exposed to the outside from the unit insulating paper 444A, while the end surface 52 of the second portion 36 is covered with the unit insulating paper 444B. Further, the end surface 53 of the second portion 36 is exposed from the unit insulating paper 444B, while the end surface 53 of the first portion 35 is covered with the connection portion 464a. For this reason, the creeping distance between the first portion 35 and the second portion 36 is very long, and the occurrence of discharge between the first portion 35 and the second portion 36 is suppressed.

  Similarly, the end surface 53 of the second portion 36 is exposed to the outside from the unit insulating paper 444B, while the end surface 53 of the third portion 37 is covered by the connection portion 464c of the unit insulating paper 444C, and further, the third portion While the end surface 52 of 37 is exposed to the outside from the unit insulating paper 444C, the end surface 52 of the second portion 36 is covered by the connection portion 464b of the unit insulating paper 444B.

  For this reason, the creeping distance between the second portion 36 and the third portion 37 is very long, and it is possible to suppress the occurrence of discharge between the second portion 36 and the third portion 37.

  Needless to say, the configuration of the resonance coil 11 and the insulating paper 430 can be applied to the resonance coil 24 and the insulating paper covering the resonance coil 24.

(Embodiment 4)
A power receiving device 40 according to the fourth embodiment will be described with reference to FIGS. 24 to 25. Of the configurations shown in FIGS. 1 to 23, the same or corresponding components as those shown in FIGS. 1 to 23 may be denoted by the same reference numerals and description thereof may be omitted.

  FIG. 24 is a perspective view showing the resonance coil 11 provided in the power receiving device 40 according to the fourth embodiment and the insulating paper provided in the resonance coil 11. As shown in FIG. 24, the resonance coil 11 is provided with insulating paper 530.

  The insulating paper 530 includes unit insulating paper 544A, unit insulating paper 544B, and unit insulating paper 544C arranged in the length direction of the resonance coil 11.

  25 is a cross-sectional view taken along line XXV-XXV shown in FIG. As shown in FIG. 25, the unit insulating paper 544A is provided so as to cover the first portion 235 of the resonance coil 11. The unit insulating film 544B is provided so as to cover the second portion 236 of the resonance coil 11. The unit insulating film 544C is provided so as to cover the third portion 237 of the resonance coil 11.

  The unit insulating film 544 connects the side portion 562a covering the side surface 251; the side portion 563a covering the side surface 250; the side portion 562a and the side portion 563a; and the connection portion 564a provided so as to cover the end surface 253. including.

  The unit insulating film 544B connects the side portion 562b covering the side surface 251 of the second portion 236, the side portion 563b covering the side surface 250 of the second portion 236, the side portion 562b and the side portion 563b, and the second portion 236. Connection portion 564b provided so as to cover the end face 252 of the.

  The unit insulating film 544C includes a side portion 562c that covers the side surface 251 of the third portion 237, a side portion 563c that covers the side surface 250, and a connection portion 564c that connects the side portion 562c and the side portion 563c.

  Here, both the side part 563a and the side part 562b are provided so as to enter the region R3 from the outside of the region R3 and further pass through the region R3 to reach the region R5. Similarly, the side portion 562c and the side portion 563b are provided so as to enter the region R4 from the region R5, pass through the region R4, and reach the region R5.

  For this reason, the creeping distance between the 1st part 235 and the 2nd part 236 is long, and it is suppressed that discharge arises between the 1st part 235 and the 2nd part 236. Similarly, since the creeping distance between the second portion 236 and the third portion 237 is long, the occurrence of discharge between the second portion 236 and the third portion 237 is suppressed.

  For this reason, in the resonance coil 11 provided in the power receiving device 40 according to the fourth embodiment, it is possible to suppress discharge from occurring between pitches.

  In the fourth embodiment, the resonance coil 11 provided in the power receiving device 40 and the insulating paper 530 provided in the resonance coil 11 have been described. However, the same configuration is applied to the resonance coil 24 of the power transmission device 41. Needless to say, you can.

(Embodiment 5)
A power receiving device 40 according to the fifth embodiment will be described with reference to FIGS. 26 and 27. FIG. 26 is a perspective view showing the resonance coil 11 provided in the power receiving device 40 according to the fifth embodiment and the insulating paper 630 provided in the resonance coil 11. As shown in FIG. 26, the insulating paper 630 is disposed between the pitches of the resonance coils 11.

  27 is a cross-sectional view taken along line XXVII-XXVII shown in FIG. As shown in FIG. 27, the insulating paper 630 is disposed between the first insulating portion 631 positioned between the first portion 35 and the second portion 36, and between the second portion 36 and the third portion 37. Second insulating portion 632.

  Note that both the first insulating portion 631 and the second insulating portion 632 are integrally formed.

  Here, the first insulating portion 631 is formed so as to enter the region R1 from the region R3 and to reach the region R3 through the region R1. Similarly, the second insulating portion 632 is also formed so as to enter the region R2 from the region R3, pass through the region R2, and reach the region R3.

  For this reason, also in the fifth embodiment, it is possible to suppress the occurrence of discharge between the first portion 35 and the second portion 36, and between the second portion 36 and the third portion 37. The occurrence of discharge can be suppressed. As described above, the insulating paper 630 is formed so as to protrude outward from the end face 52 and to protrude outward from the end face 53.

  In the fifth embodiment, the configuration of the resonance coil 11 provided in the power receiving device 40 and the insulating paper 630 provided in the resonance coil 11 has been described, but the same configuration is provided in the power transmission device 41. Needless to say, the present invention can be applied to the resonance coil 24 and the insulating paper provided in the resonance coil 24.

(Embodiment 6)
A power receiving device 40 according to the sixth embodiment will be described with reference to FIGS. 28 and 29. FIG. 28 is a perspective view showing the resonance coil 11 of the power receiving device 40 provided in the sixth embodiment and the insulating paper 730 provided in the resonance coil 11.

  The resonance coil 24 of the sixth embodiment extends so as to surround the winding center line O3 and moves in the extending direction of the winding center line O3 from the third end to the fourth end. It is formed to do.

  FIG. 29 is an enlarged cross-sectional view of a part of FIG. In FIG. 29, the insulating paper 730 includes a third insulating portion 731 disposed between the first portion 235 and the second portion 236, and a first insulating portion disposed between the first portion 235 and the third portion 237. 4 insulation portion 732.

  The third insulating portion 731 and the fourth insulating portion 732 both extend in the direction in which the resonance coil 24 extends and are connected to each other.

  The third insulating portion 731 is formed so as to enter the region R7 from the region R9, pass through the region R7, and be drawn out to the region R9.

  Similarly, the fourth insulating portion 732 enters the region R8 from the region R9, passes through the region R8, and is drawn out to the region R9. As described above, the insulating paper 730 is formed to extend outward from the end face 253 and to extend outward from the end face 252.

  For this reason, also in the power receiving device 40 according to the sixth embodiment, the insulation distance between the first portion 235 and the second portion 236 of the resonance coil 11 is long, and the second portion 236 and the third portion 237 The insulation distance between them is long.

  For this reason, even during power transmission, the occurrence of discharge between the first portion 235 and the second portion 236 and between the second portion 236 and the third portion 237 is suppressed.

  In the sixth embodiment, the resonance coil 11 provided in the power receiving device 40 and the insulating paper 730 provided in the resonance coil 11 have been described. However, the same configuration is used for the resonance coil 24 of the power transmission device 41 and the resonance coil 24. Needless to say, the present invention can be applied to insulating paper provided in the resonance coil 24.

(Embodiment 7)
The power receiving device 40 and the power transmitting device 41 according to the present embodiment will be described with reference to FIGS. 30 to 35. Of the configurations shown in FIGS. 30 to 35, configurations that are the same as or correspond to the configurations shown in FIGS. 1 to 29 may be given the same reference numerals and explanation thereof may be omitted.

  FIG. 30 is a perspective view showing the power reception unit 27 provided in the power reception device 40 of the present embodiment. As shown in FIG. 30, the power reception unit 27 is connected to the electromagnetic induction coil 12, the resonance coil 11, the support unit 801 that supports the electromagnetic induction coil 12 and the resonance coil 11, and both ends of the resonance coil 11. And a capacitor 19.

  The resonance coil 11 is formed by bending the conducting wire 233 so as to surround the winding center line O1 from one end to the other end, and the resonance coil 11 is directed from the one end to the other end. The winding center line O1 is formed so as to be displaced in the extending direction.

  The support unit 801 includes a plurality of coil holding members 802 arranged in an annular shape around the winding center line O1. The coil holding member 802 is made of an insulating resin material.

  The resonance coil 11 and the electromagnetic induction coil 12 are mounted on the outer periphery of the coil holding member 802 arranged in an annular shape. Note that the resonance coil 11 and the electromagnetic induction coil 12 may be arranged on the inner peripheral side of the coil holding member 802 arranged in an annular shape.

  FIG. 31 is a perspective view showing the coil holding member 802. As shown in FIG. 31, the coil holding member 802 is provided on the upper end side, a support unit 801 that is fixed to the top plate portion of the shield, and a column portion that is connected to the coil holding member 802 and extends downward. 804 and a plurality of support portions 805 formed at intervals in the column portion 804.

  A plurality of support portions 805 are formed at intervals toward the lower side, and a plurality of groove portions 806 are formed by the support portions 805. The resonance coil 11 and the electromagnetic induction coil 12 are fitted in the groove 806.

  In the example according to the seventh embodiment, the resonance coil 11 has approximately two turns. Therefore, the resonance coil 11 is fitted in the groove 806a and the groove 806b adjacent to the groove 806a.

  Here, an insulating portion 811 is provided in the groove portion 806a, and an insulating portion 812 is also provided in the groove portion 806b.

  FIG. 32 is a cross-sectional view showing a part of the groove 806. As shown in FIG. 32, the resonance coil 11 includes a first portion 235 and a second portion 236 in a cross section perpendicular to the extending direction of the resonance coil 11. The arrangement direction of the first part 235 and the second part 236 from the first part 235 toward the second part 236 is defined as an arrangement direction D3.

  Here, the insulating portion 811 is disposed on the inner peripheral surface of the groove portion 806a, and the first portion 235 is provided so as to be partially fitted in the groove portion 806a and covered with the insulating portion 811.

  The first portion 235 includes a side surface 251 and a side surface 250 arranged in the thickness direction, and an end surface 252 and an end surface 253 provided so as to connect the end portion of the side surface 251 and the end portion of the side surface 250.

  The first portion 235 is fitted into the groove 806a such that the side surface 251 and part of the side surface 250 and the end surface 252 are exposed from the groove 806a.

  The insulating portion 811 includes a side portion 821 provided so as to cover the side surface 251, a side portion 822 provided so as to cover the side surface 250, and a connection portion 823 provided so as to cover the end surface 253.

  The side portion 821 is disposed between the inner peripheral surface of the groove portion 806 and the side surface 251, and the side portion 822 is disposed between the inner peripheral surface of the groove portion 806 a and the side surface 250.

  And the side part 821 and the side part 822 are pulled out to the winding centerline O1 side rather than the 1st part 235.

  The connection portion 823 is provided so as to cover the end surface 253 of the first portion 235, and the connection portion 823 is disposed between the end surface 253 and the inner peripheral surface of the groove portion 806a.

  The insulating portion 812 is formed in the same manner as the insulating portion 811. The insulating part 812 connects the side part 824 covering the side face 251 of the second part 236, the side part 825 covering the side face 250 of the second part 236, and one end part of the side part 824 and one end part of the side part 825. Part 826.

  Here, the side portion 822 enters the region R7 from the region R9, passes through the region R7, and is drawn from the region R7 to the region R9.

  Similarly, the side portion 824 also enters the region R7 from the region R9, passes through the region R7, and is drawn from the region R7 to the region R9.

  For this reason, the creeping distance between the first portion 235 and the second portion 236 is long, and the occurrence of discharge between the first portion 235 and the second portion 236 is suppressed.

  FIG. 33 is a perspective view showing power transmission unit 28 of power transmission device 41 according to the present embodiment. As shown in FIG. 33, the power transmission unit 28 includes an electromagnetic induction coil 23, a resonance coil 24, and a support unit 851 that supports the electromagnetic induction coil 23 and the resonance coil 24.

  The resonance coil 24 extends from one end to the other end so as to surround the winding center line O2 and bends the conducting wire 333 so as to be displaced in the extending direction of the winding center line O2. Yes.

  The support unit 851 includes a plurality of coil support members 852 arranged in an annular shape with a space around the winding center line O2.

  FIG. 34 is a perspective view showing the coil support member 852. As shown in FIG. 34, the coil support member 852 includes a base portion 853 fixed to the bottom surface of the shield, and a column portion 854 extending upward from the base portion 853.

  A plurality of support portions 855 are formed in the column portion 854 at intervals, and a groove portion 856 is formed between the support portions 855.

  In the present embodiment, the resonance coil 24 has about two turns, and the resonance coil 24 is fitted into the groove portion 856a and the groove portion 856b.

  The power transmission unit 28 includes insulating paper 861 provided in the groove 856a and insulating paper 862 provided in the groove 856b.

  FIG. 35 is a cross-sectional view showing a part of the coil support member 852. As shown in FIG. 35, in a cross section perpendicular to the extending direction of the resonance coil 24, the resonance coil 24 includes a fourth portion 335 and a fifth portion 336 arranged in the arrangement direction D4.

  The fourth portion 335 is covered with insulating paper 861 disposed in the groove portion 856a, and the fourth portion 335 is covered with insulating paper 862 disposed in the groove portion 856b.

  The insulating paper 861 is a connection that connects the side portion 871 that covers the side surface 351 of the fourth portion 335, the side portion 872 that covers the side surface 350 of the fourth portion 335, one end portion of the side portion 871, and one end portion of the side portion 872. Part 873. The connection portion 873 is provided so as to cover the end surface 353 of the fourth portion 335.

  The insulating paper 862 includes a side portion 874 provided to cover the side surface 351 of the fifth portion 336, a side portion 875 provided to cover the side surface 351 of the fifth portion 336, and one end portion of the side portion 874. And a connecting portion 876 that connects one end portion of the side portion 875. The connection portion 876 is formed so as to cover the end surface 353 of the fifth portion 336. The side portion 872 and the side portion 874 are formed so as to enter the region R10 from the region R11 located outside the region R10, pass through the region R1, and be drawn from the region R1.

  For this reason, the creeping distance between the 4th part 335 and the 5th part 336 is long, and it can suppress that discharge arises between the 4th part 335 and the 5th part 336. FIG.

  Further, the side portion 872 projects from the end surface 352 of the fourth portion 335 to the winding center line O2 side, and the side portion 874 also projects from the end surface 352 of the fifth portion 336 to the winding center line O2 side. Yes.

  For this reason, the creeping distance between the 4th part 335 and the 5th part 336 becomes long, and it can suppress that discharge arises between the 4th part 335 and the 5th part 336. FIG. In each of the above embodiments, the power transmitting device and the power receiving device including the electromagnetic induction coils 12 and 23 are exemplified, but the present invention can also be applied to a resonance type non-contact power transmitting and receiving device not including the electromagnetic induction coil. .

  Specifically, on the power transmission device 41 side, the power supply unit (the AC power supply 21 and the high-frequency power driver 22) may be directly connected to the resonance coil 24 without providing the electromagnetic induction coil 23. On the power reception device 40 side, the rectifier 13 may be directly connected to the resonance coil 11 without providing the electromagnetic induction coil 12. The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  DESCRIPTION OF SYMBOLS 10 Electric vehicle, 11, 24, 94, 99 Resonance coil, 12, 23, 92, 97 Electromagnetic induction coil, 13 Rectifier, 14 Converter, 15 Battery, 16 Power control unit, 17 Motor unit, 19, 25, 95, 98 Capacitor, 20 External power supply device, 21 AC power source, 22 High frequency power driver, 26 Control unit, 27, 96 Power receiving unit, 28, 93 Power transmission unit, 30, 130, 230, 330, 430, 530, 630, 730, 861, 862 Insulating paper, 31,231 First end, 32,232 Second end, 33, 133, 233, 333 Conductor, 35,235 First part, 36,236 Second part, 37,237 Third part, 40, 91 Power receiving device, 41, 90 Power transmitting device, 42 Parking space, 50, 51, 150, 151 50, 251, 350, 351 Side surface, 52, 53, 152, 153, 252, 253, 352, 353 End surface, 60, 61, 160, 161, 260, 261, 360, 361 Virtual plane, 62, 62a, 62b, 62c, 63, 63a to 63c Side part, 64, 64a, 64b, 64c, 64b, 64c Connection part, 89 Power transmission system, 131, 331 Third end part, 132, 332 Fourth end part, 135, 335 Fourth part Part, 136,336 fifth part, 137,337 sixth part, 353 first part end face, 444A-444C unit insulating paper, 544,544B, 544C unit insulating film, 631 first insulating part, 632 second insulating part, 731 Third insulating portion, 732 Fourth insulating portion, 801, 851 Support unit, 802 Coil holding member, 804, 85 Column portions, 805,855 supporting portion, 806,806a, 806b, 856,856a, 856b groove 811 insulating portion, 852 a coil support member 853 base section.

Claims (12)

Provided with a power receiving unit that receives power in a non-contact manner from a power transmitting unit provided outside,
The power receiving unit includes a first coil formed by winding the first conductor with a pitch so as to surround the first winding center line, and a first insulating paper provided on the first coil; Including
The first coil includes a first portion, and a second portion adjacent to the first portion with the pitch,
The first insulating paper is disposed between the first portion and the second portion, and the first insulating paper is in a cross section perpendicular to the extending direction of the first coil, and the first portion and the second portion. Projecting outward from the first region sandwiched by the second part,
The first insulating paper includes a first side portion and a second side portion disposed so as to sandwich the first conductive wire, and a connection portion that connects the first side portion and the second side portion,
The length of the first conductor in the direction perpendicular to the arrangement direction of the first part and the second part is the width of the first conductor, and the first side part in the direction perpendicular to the arrangement direction and the first part When the length of the two side portions is the width of the first side portion and the second side portion, the width of the first side portion and the second side portion is larger than the width of the first conducting wire,
The first coil includes a first end and a second end,
The first coil extends so as to surround the first winding center line and is displaced in the extending direction of the first winding center line from the first end toward the second end. Formed by bending the first conductive wire,
The connecting portion is provided so as to cover a portion of the first conducting wire located on the opposite side to the portion facing the first winding center line in a cross section perpendicular to the extending direction of the first coil. is, the connecting portion is provided to extend in the extending direction of the first coil, powered device. Provided with a power receiving unit that receives power in a non-contact manner from a power transmitting unit provided outside,
The power receiving unit includes a first coil formed by winding the first conductor with a pitch so as to surround the first winding center line, and a first insulating paper provided on the first coil; Including
The first coil includes a first portion, and a second portion adjacent to the first portion with the pitch,
The first insulating paper is disposed between the first portion and the second portion, and the first insulating paper is in a cross section perpendicular to the extending direction of the first coil, and the first portion and the second portion. Projecting outward from the first region sandwiched by the second part,
The first insulating paper includes a first side portion and a second side portion disposed so as to sandwich the first conductive wire, and a connection portion that connects the first side portion and the second side portion,
The length of the first conductor in the direction perpendicular to the arrangement direction of the first part and the second part is the width of the first conductor, and the first side part in the direction perpendicular to the arrangement direction and the first part When the length of the two side portions is the width of the first side portion and the second side portion, the width of the first side portion and the second side portion is larger than the width of the first conducting wire,
The first coil includes a first end and a second end,
The first coil extends so as to surround the first winding center line and is displaced in the extending direction of the first winding center line from the first end toward the second end. Formed by bending the first conductive wire,
In the cross section perpendicular to the extending direction of the first coil, the connection portion includes a first covering portion that covers a portion of the surface of the first conductive wire that faces the first winding center line, and the first conductive wire. A second covering portion covering a portion located on the opposite side to the portion facing the first winding center line of the surface of
The first covering portion is provided in said first portion, said second cover portion, said provided second portion, powered device. Provided with a power receiving unit that receives power in a non-contact manner from a power transmitting unit provided outside,
The power receiving unit includes a first coil formed by winding the first conductor with a pitch so as to surround the first winding center line, and a first insulating paper provided on the first coil; Including
The first coil includes a first portion, and a second portion adjacent to the first portion with the pitch,
The first insulating paper is disposed between the first portion and the second portion, and the first insulating paper is in a cross section perpendicular to the extending direction of the first coil, and the first portion and the second portion. Projecting outward from the first region sandwiched by the second part,
The first coil includes a first end and a second end,
The first coil extends so as to surround the first winding center line and is displaced in the extending direction of the first winding center line from the first end toward the second end. Formed by bending the first conductive wire,
The first insulating paper is formed to extend from the first region to the first winding center line side and to extend to the opposite side of the first winding center line with respect to the first region. , powered device. 4. The power receiving device according to claim 1, wherein a difference between the natural frequency of the power transmission unit and the natural frequency of the power reception unit is 10% or less of the natural frequency of the power reception unit. 5. The power receiving device according to any one of claims 1 to 4 , wherein a coupling coefficient between the power receiving unit and the power transmitting unit is 0.1 or less. The power reception unit is formed between the power reception unit and the power transmission unit and vibrates at a specific frequency, and an electric field formed between the power reception unit and the power transmission unit and vibrates at a specific frequency. The power receiving device according to any one of claims 1 to 5 , wherein the power receiving device receives power from the power transmission unit through at least one of the following. Provided with a power transmission unit that transmits power in a non-contact manner to a power receiving unit provided outside,
The power transmission unit includes a second coil formed by winding the second conductor with a pitch so as to surround the second winding center line, and a second insulating paper provided on the second coil; Including
The second coil includes a third portion, and a fourth portion adjacent to the third portion with the pitch,
The second insulating paper is disposed between the third portion and the fourth portion, and protrudes outward from a second region sandwiched between the third portion and the fourth portion,
The second insulating paper includes a third side portion and a fourth side portion arranged so as to sandwich the second conductive wire, and a connection portion that connects the third side portion and the fourth side portion,
The length of the second conductor in the direction perpendicular to the arrangement direction of the third portion and the fourth portion is the width of the second conductor, and the third side portion in the direction perpendicular to the arrangement direction and the second portion When the length of the four side portions is the width of the third side portion and the fourth side portion, the width of the third side portion and the fourth side portion is larger than the width of the second conductive wire,
The second coil includes a third end and a fourth end,
The second coil extends so as to surround the second winding center line and is displaced in the extending direction of the second winding center line from the third end toward the fourth end. Formed by bending the second conductor,
The connecting portion is provided so as to cover a portion of the second conducting wire located on the opposite side to the portion facing the second winding center line in a cross section perpendicular to the extending direction of the second coil. is, the connecting portion is provided to extend in the extending direction of the second coil, feeding collector. Provided with a power transmission unit that transmits power in a non-contact manner to a power receiving unit provided outside,
The power transmission unit includes a second coil formed by winding the second conductor with a pitch so as to surround the second winding center line, and a second insulating paper provided on the second coil; Including
The second coil includes a third portion, and a fourth portion adjacent to the third portion with the pitch,
The second insulating paper is disposed between the third portion and the fourth portion, and protrudes outward from a second region sandwiched between the third portion and the fourth portion,
The second insulating paper includes a third side portion and a fourth side portion arranged so as to sandwich the second conductive wire, and a connection portion that connects the third side portion and the fourth side portion,
The length of the second conductor in the direction perpendicular to the arrangement direction of the third portion and the fourth portion is the width of the second conductor, and the third side portion in the direction perpendicular to the arrangement direction and the second portion When the length of the four side portions is the width of the third side portion and the fourth side portion, the width of the third side portion and the fourth side portion is larger than the width of the second conductive wire,
The second coil includes a third end and a fourth end,
The second coil extends so as to surround the second winding center line and is displaced in the extending direction of the second winding center line from the third end toward the fourth end. Formed by bending the second conductor,
The connecting portion includes a third covering portion that covers a portion of the surface of the second conducting wire facing the second winding center line in a cross section perpendicular to the extending direction of the second coil, and the second conducting wire. A fourth covering portion that covers a portion located on the opposite side of the surface facing the second winding center line,
The third covering portion is provided in the third portion, and the fourth covering portion is provided in the fourth portion. Provided with a power transmission unit that transmits power in a non-contact manner to a power receiving unit provided outside,
The power transmission unit includes a second coil formed by winding the second conductor with a pitch so as to surround the second winding center line, and a second insulating paper provided on the second coil; Including
The second coil includes a third portion, and a fourth portion adjacent to the third portion with the pitch,
The second insulating paper is disposed between the third portion and the fourth portion, and protrudes outward from a second region sandwiched between the third portion and the fourth portion,
The second coil includes a third end and a fourth end,
The second coil extends so as to surround the second winding center line and is displaced in the extending direction of the second winding center line from the third end toward the fourth end. Formed by bending the second conductor,
The second insulating paper extends from the second region to the second winding center line side and is formed to extend to the opposite side of the second winding center line with respect to the second region. , electricity transmission equipment. The power transmission device according to any one of claims 7 to 9 , wherein a difference between the natural frequency of the power transmission unit and the natural frequency of the power reception unit is 10% or less of the natural frequency of the power reception unit. The power transmission device according to any one of claims 7 to 10 , wherein a coupling coefficient between the power reception unit and the power transmission unit is 0.1 or less. The power reception unit is formed between the power reception unit and the power transmission unit and vibrates at a specific frequency, and an electric field formed between the power reception unit and the power transmission unit and vibrates at a specific frequency. The power transmission device according to claim 7 , wherein power is received from the power transmission unit through at least one of the power transmission unit.

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