WO2021075498A1 - Wireless power feeding device - Google Patents

Wireless power feeding device Download PDF

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Publication number
WO2021075498A1
WO2021075498A1 PCT/JP2020/038916 JP2020038916W WO2021075498A1 WO 2021075498 A1 WO2021075498 A1 WO 2021075498A1 JP 2020038916 W JP2020038916 W JP 2020038916W WO 2021075498 A1 WO2021075498 A1 WO 2021075498A1
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WO
WIPO (PCT)
Prior art keywords
power
power receiving
coil
rotation angle
receiving device
Prior art date
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PCT/JP2020/038916
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French (fr)
Japanese (ja)
Inventor
裕己 太田
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株式会社アドヴィックス
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Publication of WO2021075498A1 publication Critical patent/WO2021075498A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • This disclosure relates to a wireless power supply device.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2018-102093 describes an example of a wireless power feeding device including a power transmission device and a plurality of power receiving devices. Each power receiving device has a power receiving coil and a variable reactance circuit. Further, this power transmission device has a plurality of power transmission coils and a plurality of variable reactance circuits. This power transmission coil generates a magnetic field by feeding power. According to this wireless power feeding device, by adjusting the reactance of each reactance circuit, an induced voltage can be efficiently generated in the power receiving coil of each power receiving device.
  • the above wireless power feeding device can generate an induced voltage with the power receiving coils of a plurality of power receiving devices.
  • the power transmission device requires a plurality of power transmission coils. The larger the number of power receiving devices, the larger the number of power transmission coils.
  • the wireless power supply device for solving the above problems includes a power transmission device and a plurality of power receiving devices.
  • the power transmission device includes a power transmission coil that generates a magnetic field when power is supplied, a support base that supports the power transmission coil in a rotatable state, an actuator that is a power source for rotating the power transmission coil, and the power transmission coil. It has a power supply control unit that feeds power to the power transmission coil and a power supply control unit that adjusts the rotation angle of the power transmission coil by controlling the actuator.
  • Each of the plurality of power receiving devices has a power receiving coil that generates an induced voltage by generating a magnetic field accompanying the power feeding from the power feeding unit to the power transmission coil.
  • the magnitude of the induced voltage generated by the power receiving coil of the first power receiving device among the plurality of power receiving devices is generated by the power receiving coil of a power receiving device other than the first power receiving device among the plurality of power receiving devices.
  • the region of the rotation angle of the power transmission coil that is larger than the magnitude of the induced voltage is defined as the first rotation angle region.
  • the magnitude of the induced voltage generated by the power receiving coil of the second power receiving device among the plurality of power receiving devices is generated by the power receiving coil of a power receiving device other than the second power receiving device among the plurality of power receiving devices.
  • the region of the rotation angle of the power transmission coil that is larger than the magnitude of the induced voltage is defined as the second rotation angle region.
  • the rotation angle of the power transmission coil is set to an angle within the first rotation angle region, and the second power receiving device is said to have an angle of rotation.
  • the rotation angle of the power transmission coil is defined as an angle within the second rotation angle region.
  • the rotation angle of one power transmission coil is adjusted.
  • the power receiving coil of the first power receiving device can efficiently generate the induced voltage
  • the power receiving coil of the second power receiving device can efficiently generate the induced voltage. That is, it is possible to suppress an increase in the number of power transmission coils.
  • FIG. 1 shows a vehicle 10 equipped with the wireless power feeding device 30 of the present embodiment.
  • the vehicle 10 includes a plurality of wheels 12, 13, 14, 15 and a plurality of braking mechanisms 20A, 20B corresponding to the wheels 12 to 15, respectively.
  • the braking mechanisms 20A and 20B press the friction material 22 against the rotating body 21 that rotates integrally with the corresponding wheels 12 to 15. As a result, frictional braking force can be applied to the wheels 12 to 15.
  • a braking mechanism 20A is provided for each of the wheels 12 and 13.
  • a braking mechanism 20B is provided for each of the wheel 14 and the wheel 15.
  • Each braking mechanism 20B is an electric braking mechanism that applies frictional braking force corresponding to the driving amount of the electric motor 23 to the wheels 14 and 15. Therefore, each braking mechanism 20B is provided with a motor control unit 24 that controls the electric motor 23.
  • the wireless power feeding device 30 includes a power transmitting device 31 and a plurality of power receiving devices 40A and 40B.
  • the power transmission device 31 includes a support base 32 fixed to the vehicle body 11 of the vehicle 10 and a power transmission coil 34 rotatably supported by the support base 32.
  • the support base 32 rotatably supports a rotating shaft 33 extending in a direction orthogonal to the central axis 34b of the power transmission coil 34.
  • the rotation shaft 33 extends in the vertical direction of the vehicle.
  • the power transmission coil 34 is fixed to the rotating shaft 33. Therefore, the power transmission coil 34 rotates integrally with the rotating shaft 33.
  • the rotation axis 34a of the power transmission coil 34 is orthogonal to the central axis 34b of the power transmission coil 34.
  • the power transmission coil 34 can rotate the central axis 34b on a virtual plane orthogonal to the rotation axis 34a.
  • the power transmission device 31 includes a power supply unit 35 that supplies power to the power transmission coil 34.
  • the power feeding unit 35 has a conversion circuit 351 that converts the DC voltage of the on-board battery 16 into an AC voltage. Therefore, an alternating current flows through the power transmission coil 34.
  • a current is passed through the power transmission coil 34, a magnetic field corresponding to the current is generated. Then, as shown by the broken line arrow in FIG. 2, the magnetic flux passes through the inside of the power transmission coil 34.
  • the actuator 36 is a power source for rotating the rotating shaft 33 and the power transmission coil 34.
  • the power supply control unit 37 adjusts the rotation angle ⁇ of the power transmission coil 34 by controlling the actuator 36.
  • the power transmission device 31 includes an actuator 36 and a power supply control unit 37. Examples of the actuator 36 include an electric motor.
  • each of the power receiving devices 40A and 40B has a power receiving coil 41 and a charging unit 43 charged by an induced voltage.
  • the charging unit 43 stores electric power and supplies electric power to the electric power supply target. Examples of the charging unit 43 include a capacitor and a secondary battery.
  • each of the power receiving devices 40A and 40B has a rectifier circuit 42 that converts the AC voltage generated by the power receiving coil 41 into a DC voltage. Then, the charging unit 43 is charged based on the voltage converted from alternating current to direct current by the rectifier circuit 42.
  • the power receiving devices 40A and 40B are provided in the braking mechanism 20B.
  • the charging unit 43 functions as a power source for the braking mechanism 20B.
  • the motor control unit 24 can be operated or the electric motor 23 can be driven by the power supply from the charging unit 43.
  • the braking mechanism 20B for the wheel 14 is provided with the first power receiving device 40A.
  • a second power receiving device 40B is provided on the braking mechanism 20B for the wheel 15. Therefore, the wheel 14 corresponds to the first wheel.
  • the wheel 15 corresponds to the second wheel.
  • Examples of the wireless power supply method include an electromagnetic induction method and a magnetic field resonance method.
  • an induced voltage is generated in the power receiving coil 41 of the power receiving devices 40A and 40B by the electromagnetic induction method.
  • the electromagnetic induction method the magnetic flux generated by the power supply to the power transmission coil 34 is passed through the inside of the power reception coil 41. Thereby, the induced voltage can be generated.
  • the alternate long and short dash line indicates the central axis 41a of the power receiving coil 41.
  • the rotation axis 34a of the power transmission coil 34 is orthogonal to the central axis 41a of each power reception coil 41.
  • the specified point P1 is a point where the central axis 41a of each power receiving coil 41 intersects.
  • the rotation axis 34a of the power transmission coil 34 is located on the specified point P1.
  • the power transmission coil 34 and each power receiving coil 41 are arranged so that the central axes 34b and 41a are along the virtual plane orthogonal to the rotation axis 34a.
  • the central axis 34b is arranged on the extension line of the central axis 41a of the power receiving coil 41 of the first power receiving device 40A. can do. Further, when the rotation angle ⁇ of the power transmission coil 34 is set to the second rotation angle ⁇ 2, the central axis 34b can be arranged on the extension line of the central axis 41a of the power receiving coil 41 of the second power receiving device 40B.
  • the first rotation angle region R1 shown in FIG. 4 is a region of the rotation angle ⁇ of the power transmission coil 34 including the first rotation angle ⁇ 1. Power may be supplied to the power transmission coil 34 under the condition that the rotation angle ⁇ is the rotation angle within the first rotation angle region R1. In this case, the magnitude of the induced voltage generated by the power receiving coil 41 of the first power receiving device 40A is larger than the magnitude of the induced voltage generated by the power receiving coil 41 of the power receiving device other than the first power receiving device 40A. Both the upper limit rotation angle and the lower limit rotation angle of the first rotation angle region R1 are preset by experiments, simulations, and the like.
  • the second rotation angle region R2 shown in FIG. 4 is a region of the rotation angle ⁇ of the power transmission coil 34 including the second rotation angle ⁇ 2. Power may be supplied to the power transmission coil 34 under the condition that the rotation angle ⁇ is the rotation angle in the second rotation angle region R2. In this case, the magnitude of the induced voltage generated by the power receiving coil 41 of the second power receiving device 40B is larger than the magnitude of the induced voltage generated by the power receiving coil 41 of the power receiving device other than the second power receiving device 40B. Both the upper limit rotation angle and the lower limit rotation angle of the second rotation angle region R2 are preset by experiments, simulations, and the like.
  • step S11 the power receiving devices 40A and 40B having the charging unit 43 to be charged are determined.
  • the power receiving device having the charging unit 43 to be charged is also referred to as a target power receiving device.
  • step S12 the preparation process for wireless power supply is executed between the target power receiving device and the power transmission device 31. This preparatory process is to adjust the rotation angle ⁇ of the power transmission coil 34 to an angle corresponding to the target power receiving device.
  • the power transmission coil 34 is rotated by driving the actuator 36.
  • the rotation angle ⁇ of the power transmission coil 34 is set as the angle within the first rotation angle region R1.
  • the rotation angle ⁇ does not have to be equal to the first rotation angle ⁇ 1 as long as it is an angle within the first rotation angle region R1.
  • the best form is to make the rotation angle ⁇ equal to the first rotation angle ⁇ 1.
  • step S13 a wireless charging process for charging the charging unit 43 of the target power receiving device is executed. That is, in the wireless charging process, power is supplied to the power transmission coil 34. When the end condition of the wireless charging process is satisfied, the wireless charging process is terminated. Then, a series of processes is completed.
  • the termination conditions of the wireless charging process include, for example, that the duration of power supply to the power transmission coil 34 is equal to or longer than a predetermined time, and that the charging amount of the charging unit 43 of the target power receiving device is equal to or longer than the predetermined charging amount. Can be mentioned.
  • the target power receiving devices are changed in order.
  • the wireless charging process is executed with the first power receiving device 40A as the target power receiving device.
  • the power transmission device 31 an alternating current flows through the power transmission coil 34 by the power supply unit 35.
  • the first power receiving device 40A an induced voltage is generated in the power receiving coil 41.
  • the charging unit 43 of the first power receiving device 40A is charged.
  • the target power receiving device is changed to the second power receiving device 40B.
  • the wireless charging process is executed.
  • an alternating current starts to flow in the power transmission coil 34 by the power supply unit 35, so that an induced voltage is generated in the power reception coil 41 in the second power reception device 40B.
  • the charging unit 43 of the second power receiving device 40B is charged.
  • the target power receiving device is changed to the first power receiving device 40A. The above process is repeatedly executed.
  • the second usage example shown below may be adopted instead of the first usage example.
  • the power receiving device having the charging unit 43 is determined as the target power receiving device. Then, wireless power is supplied between the power receiving device and the power transmitting device 31, and the charging unit 43 of the power receiving device is charged.
  • the series of processes shown in FIG. 5 is not executed.
  • the charging unit 43 of the first power receiving device 40A can be charged, or the charging unit 43 of the second power receiving device 40B can be charged. can do. That is, when charging the charging unit 43 of the first power receiving device 40A, the rotation angle ⁇ of the power transmission coil 34 is set to an angle within the first rotation angle region R1, and power is supplied to the power transmission coil 34. As a result, an induced voltage is generated in the power receiving coil 41 of the first power receiving device 40A, and the charging unit 43 is charged based on the induced voltage. At this time, an induced voltage may also be generated in the power receiving coil 41 of the second power receiving device 40B.
  • the magnitude of the induced voltage in the second power receiving device 40B is smaller than the magnitude of the induced voltage in the first power receiving device 40A. Therefore, the charge amount of the charging unit 43 of the second power receiving device 40B is smaller than the charging amount of the charging unit 43 of the first power receiving device 40A.
  • the rotation angle ⁇ of the power transmission coil 34 is set to an angle within the second rotation angle region R2, and then power is supplied to the power transmission coil 34.
  • an induced voltage is generated in the power receiving coil 41 of the second power receiving device 40B, and the charging unit 43 is charged by the induced voltage.
  • an induced voltage may also be generated in the power receiving coil 41 of the first power receiving device 40A.
  • the magnitude of the induced voltage in the first power receiving device 40A is smaller than the magnitude of the induced voltage in the second power receiving device 40B. Therefore, the charge amount of the charging unit 43 of the first power receiving device 40A is smaller than the charging amount of the charging unit 43 of the second power receiving device 40B.
  • the wireless power feeding device 30 is provided with a plurality of power receiving devices 40A and 40B, an increase in the number of power transmission coils 34 can be suppressed. More specifically, one power transmission coil 34 can be charged by a plurality of power receiving devices 40A and 40B.
  • the rotating axis 34a of the power transmission coil 34 is orthogonal to the central axis 34b of the power transmission coil 34 and the central axis 41a of each power receiving coil 41. Therefore, by adjusting the rotation angle ⁇ , it becomes easy to superimpose the central axis 34b of the power transmission coil 34 on the central axis 41a of the power receiving coil 41. That is, the induced voltage can be efficiently generated in the power receiving coil 41 of the target power receiving device, and the charging unit 43 of the target power receiving device can be efficiently charged.
  • the charging unit 43 of the first power receiving device 40A can be charged or the charging unit 43 of the second power receiving device 40B can be charged by the rotation of the power transmission coil 34.
  • the required space is small. In particular, it is advantageous in the limited space of the vehicle 10.
  • the wireless power feeding device 30 of the present embodiment includes a third power receiving device 40C and a relay device 50 in addition to the power transmitting device 31, the first power receiving device 40A, and the second power receiving device 40B.
  • the third power receiving device 40C is arranged at a position farther from the first power receiving device 40A and the second power receiving device 40B when viewed from the power transmitting device 31. Since the configuration of the third power receiving device 40C is substantially the same as the configuration of the first power receiving device 40A and the second power receiving device 40B, the description of the configuration of the third power receiving device 40C is omitted.
  • the relay device 50 has a relay coil 51.
  • the relay coil 51 generates an induced voltage by generating a magnetic field accompanying power feeding from the power feeding unit 35 to the power transmission coil 34.
  • the central axis 51a of the relay coil 51 is orthogonal to the rotation axis 34a of the power transmission coil 34 of the power transmission device 31.
  • the relay coil 51 is arranged in a state where wireless power supply is possible with the power receiving coil 41 of the third power receiving device 40C. That is, the relay coil 51 is arranged so that when a magnetic field is generated in the relay coil 51, an induced voltage is generated in the power receiving coil 41 of the third power receiving device 40C due to the influence of the magnetic field.
  • the central axis 34b of the power transmission coil 34 can be arranged on the extension line of the central axis 51a of the relay coil 51.
  • the third rotation angle region R3 shown in FIG. 6 is a region of the rotation angle ⁇ of the power transmission coil 34 including the third rotation angle ⁇ 3.
  • Both the upper limit rotation angle and the lower limit rotation angle of the third rotation angle region R3 are preset by experiments, simulations, and the like.
  • the rotation angle ⁇ of the power transmission coil 34 is changed to the third rotation angle by the preparatory process. It is the angle of the region R3.
  • the rotation angle ⁇ does not have to be equal to the third rotation angle ⁇ 3 as long as it is an angle within the third rotation angle region R3.
  • the rotation angle ⁇ is equal to the third rotation angle ⁇ 3.
  • the relay coil 51 may be arranged so as to satisfy either one of the following two conditions (A) and (B).
  • A) When the power is supplied to the power transmission coil 34 under the condition that the rotation angle ⁇ is the rotation angle in the third rotation angle region R3, the magnitude of the induced voltage generated in the power receiving coil 41 of the third power receiving device 40C is determined.
  • the magnitude of the induced voltage generated by the power receiving coil 41 of the first power receiving device 40A shall be larger than the magnitude of the induced voltage generated by the power receiving coil 41 of the second power receiving device 40B.
  • the magnitude of the induced voltage generated in the power receiving coil 41 of the third power receiving device 40C is determined.
  • the magnitude of the induced voltage generated by the power receiving coil 41 of the second power receiving device 40B shall be larger than the magnitude of the induced voltage generated by the power receiving coil 41 of the first power receiving device 40A.
  • the relay coil 51 When the relay coil 51 is arranged so as to satisfy the condition (A), at least a part of the third rotation angle region R3 may overlap with the second rotation angle region R2. On the other hand, when the relay coil 51 is arranged so as to satisfy the condition (B), at least a part of the third rotation angle region R3 may overlap with the first rotation angle region R1.
  • power is wirelessly supplied between the power transmission device 31 and the third power receiving device 40C via one relay coil 51.
  • wireless power supply may be performed between the power transmission device 31 and the third power receiving device 40C via two or more relay coils 51.
  • the relay device 50 is provided separately from the power receiving devices 40A and 40B in order to charge the charging unit 43 of the third power receiving device 40C.
  • either one of the first power receiving device 40A and the second power receiving device 40B may be made to function as a relay device.
  • the first power receiving device 40A functions as a relay device
  • the power receiving coil 41 of the first power receiving device 40A functions as a relay coil.
  • the first power receiving device 40A and the third power receiving device 40C so that the induced voltage is generated by the power receiving coil 41 of the third power receiving device 40C by generating the magnetic flux in the power receiving coil 41 of the first power receiving device 40A. Need to be placed.
  • the central axis 41a of the power receiving coil 41 of each power receiving device is set along the first virtual plane. ..
  • the central axis 41a of the power receiving coil 41 of at least one of the power receiving devices can be orthogonal to the rotating axis 34a of the power transmitting coil 34, the central axis 41a needs to be along the first virtual plane. Absent. In other words, even if the position of the central axis 41a of the power receiving coil 41 of each power receiving device in the vehicle vertical direction is slightly different from the position of the central axis 34b of the power transmission coil 34 in the vehicle vertical direction. Good.
  • the electric power of the charging unit 43 of the power receiving devices 40A and 40B is supplied to the motor control unit 24, it is not necessary to supply the electric power to the electric motor 23.
  • the electric motor 23 is driven by power supplied from a power source different from that of the charging unit 43.
  • the power receiving device may be provided in an in-vehicle device other than the braking mechanism 20B as long as it is a device that requires electric power.
  • a power window device can be mentioned.
  • the power receiving device may be provided in an in-vehicle electronic control device.
  • the charging unit 43 of the power receiving device can be used as a power source for the electronic control device.
  • the wireless power feeding device 30 may be applied to a vehicle in which an in-wheel motor system in which a drive motor as a power source of the vehicle is provided on the wheel is adopted as the drive system.
  • the charging unit 43 of the power receiving device can be used as a power source for the motor control device that controls the drive motor, or can be used as a power source for the drive motor.
  • the wireless power feeding device 30 may be provided in a device other than the vehicle.
  • the power transmission coil 34 is rotated around one axis.
  • the power transmission coil 34 may be rotated on two axes, or the power transmission coil 34 may be rotated on three axes. As a result, the degree of freedom in arranging the power receiving device is increased.
  • the wireless power feeding device may include any number of three or more power receiving devices as long as it includes two or more power receiving devices. Of the plurality of power receiving devices constituting the wireless power feeding device 30, at least one power receiving device does not have to have the charging unit 43. A power receiving device that does not have a charging unit 43 is called a specified charging device.
  • An in-vehicle device provided with a specified charging device, which operates by power feeding by the wireless power feeding device 30, is referred to as a power feeding target unit. Then, in the in-vehicle device provided with the specified charging device, the power supply target unit can be operated only when the induced voltage is generated in the power receiving coil 41 of the specified power receiving device. Therefore, it is possible to adjust the rotation angle ⁇ of the power transmission coil 34 so that the power receiving coil 41 of the specified charging device can generate an induced voltage when operating the power supply target portion of the in-vehicle device provided with the specified charging device. preferable.
  • the vehicle 10 may be equipped with a plurality of wireless power feeding devices 30.
  • a method other than the electromagnetic induction method may be adopted.
  • a magnetic resonance method can be mentioned.
  • a region having a rotation angle ⁇ corresponding to the magnetic resonance method is set as the first rotation angle region R1 when wireless power is supplied between the power transmission device 31 and the first power receiving device 40A.
  • a region having a rotation angle ⁇ corresponding to the magnetic resonance method is set as the second rotation angle region R2 when wireless power is supplied between the power transmission device 31 and the second power reception device 40B.
  • the power supply control unit 37 includes one or more dedicated hardware circuits such as one or more processors that operate according to a computer program, dedicated hardware that executes at least a part of various processes, or a combination thereof. It can be configured as a circuit.
  • the dedicated hardware for example, an ASIC which is an integrated circuit for a specific application can be mentioned.
  • the processor includes a CPU and a memory such as a RAM and a ROM, and the memory stores a program code or an instruction configured to cause the CPU to execute a process.
  • Memory, or storage medium includes any available medium accessible by a general purpose or dedicated computer.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A power transmission device 31 of a wireless power feeding device 30 includes: a power transmission coil 34; a support base 32 that supports the power transmission coil 34 in a rotatable manner; an actuator 36; a power feeding unit 35 that feeds power to the power transmission coil 34; and a power feeding control unit 37 that adjusts the rotation angle of the power transmission coil 34 by controlling the actuator 36. Each power receiving device 40A, 40B of the wireless power feeding device 30 comprises a power receiving coil 41. The power feeding control unit 37 varies the rotation angle of the power transmission coil 34 when an induced voltage is generated at the power receiving coil 41 of the first power receiving device 40A and when an induced voltage is generated at the power receiving coil 41 of the second power receiving device 40B.

Description

無線給電装置Wireless power supply
　本開示は、無線給電装置に関する。 This disclosure relates to a wireless power supply device.
　特許文献１（特開２０１８－１０２０９３号公報）には、送電装置と、複数の受電装置とを備える無線給電装置の一例が記載されている。各受電装置は、受電コイルと、可変リアクタンス回路とを有している。また、この送電装置には、複数の送電コイルと、複数の可変リアクタンス回路とを有している。この送電コイルは、給電により磁界を発生する。この無線給電装置によれば、各リアクタンス回路のリアクタンスを調整することにより、各受電装置の受電コイルで誘起電圧を効率よく発生させることができる。 Patent Document 1 (Japanese Unexamined Patent Publication No. 2018-102093) describes an example of a wireless power feeding device including a power transmission device and a plurality of power receiving devices. Each power receiving device has a power receiving coil and a variable reactance circuit. Further, this power transmission device has a plurality of power transmission coils and a plurality of variable reactance circuits. This power transmission coil generates a magnetic field by feeding power. According to this wireless power feeding device, by adjusting the reactance of each reactance circuit, an induced voltage can be efficiently generated in the power receiving coil of each power receiving device.
　上記の無線給電装置は、複数の受電装置の受電コイルで誘起電圧を発生させることができる。しかし、送電装置に複数の送電コイルが必要である。そして、受電装置の数が多いほど、送電コイルの数が多くなってしまう。 The above wireless power feeding device can generate an induced voltage with the power receiving coils of a plurality of power receiving devices. However, the power transmission device requires a plurality of power transmission coils. The larger the number of power receiving devices, the larger the number of power transmission coils.
　上記課題を解決するための無線給電装置は、送電装置と複数の受電装置とを備えている。前記送電装置は、給電されると磁界を発生する送電コイルと、前記送電コイルを回転可能な状態で支持する支持台と、前記送電コイルを回転させる際の動力源であるアクチュエータと、前記送電コイルに給電する給電部と、前記アクチュエータの制御により前記送電コイルの回転角を調整する給電制御部と、を有している。複数の前記受電装置は、前記給電部から前記送電コイルへの給電に伴う磁界の発生によって誘起電圧を発生する受電コイルをそれぞれ有している。複数の前記受電装置のうちの第１受電装置の前記受電コイルで発生する誘起電圧の大きさが複数の前記受電装置のうちの前記第１受電装置以外の他の受電装置の前記受電コイルで発生する誘起電圧の大きさよりも大きくなる前記送電コイルの回転角の領域を第１回転角領域とする。複数の前記受電装置のうちの第２受電装置の前記受電コイルで発生する誘起電圧の大きさが複数の前記受電装置のうちの前記第２受電装置以外の他の受電装置の前記受電コイルで発生する誘起電圧の大きさよりも大きくなる前記送電コイルの回転角の領域を第２回転角領域とする。この場合、前記給電制御部は、前記第１受電装置の前記受電コイルで誘起電圧を発生させるときには前記送電コイルの回転角を前記第１回転角領域内の角度とし、前記第２受電装置の前記受電コイルで誘起電圧を発生させるときには前記送電コイルの回転角を前記第２回転角領域内の角度とする。 The wireless power supply device for solving the above problems includes a power transmission device and a plurality of power receiving devices. The power transmission device includes a power transmission coil that generates a magnetic field when power is supplied, a support base that supports the power transmission coil in a rotatable state, an actuator that is a power source for rotating the power transmission coil, and the power transmission coil. It has a power supply control unit that feeds power to the power transmission coil and a power supply control unit that adjusts the rotation angle of the power transmission coil by controlling the actuator. Each of the plurality of power receiving devices has a power receiving coil that generates an induced voltage by generating a magnetic field accompanying the power feeding from the power feeding unit to the power transmission coil. The magnitude of the induced voltage generated by the power receiving coil of the first power receiving device among the plurality of power receiving devices is generated by the power receiving coil of a power receiving device other than the first power receiving device among the plurality of power receiving devices. The region of the rotation angle of the power transmission coil that is larger than the magnitude of the induced voltage is defined as the first rotation angle region. The magnitude of the induced voltage generated by the power receiving coil of the second power receiving device among the plurality of power receiving devices is generated by the power receiving coil of a power receiving device other than the second power receiving device among the plurality of power receiving devices. The region of the rotation angle of the power transmission coil that is larger than the magnitude of the induced voltage is defined as the second rotation angle region. In this case, when the power supply control unit generates an induced voltage with the power receiving coil of the first power receiving device, the rotation angle of the power transmission coil is set to an angle within the first rotation angle region, and the second power receiving device is said to have an angle of rotation. When the induced voltage is generated by the power receiving coil, the rotation angle of the power transmission coil is defined as an angle within the second rotation angle region.
　上記構成によれば、１つの送電コイルの回転角を調整する。これにより、第１受電装置の受電コイルで効率よく誘起電圧を発生させたり、第２受電装置の受電コイルで効率よく誘起電圧を発生させたりすることができる。すなわち、送電コイルの数の増大を抑制できる。 According to the above configuration, the rotation angle of one power transmission coil is adjusted. As a result, the power receiving coil of the first power receiving device can efficiently generate the induced voltage, and the power receiving coil of the second power receiving device can efficiently generate the induced voltage. That is, it is possible to suppress an increase in the number of power transmission coils.
第１実施形態の無線給電装置を備える車両の概略構成を示す図。The figure which shows the schematic structure of the vehicle which includes the wireless power feeding device of 1st Embodiment. 同無線給電装置の送電装置の概略構成を示す模式図。The schematic diagram which shows the schematic structure of the power transmission device of the wireless power supply device. 同無線給電装置の受電装置の概略構成を示す模式図。The schematic diagram which shows the schematic structure of the power receiving device of the wireless power feeding device. 同無線給電装置の作用図。Operation diagram of the wireless power supply device. 送電装置の給電制御部が実行する処理の流れを説明するフローチャート。A flowchart illustrating a flow of processing executed by a power supply control unit of a power transmission device. 第２実施形態の無線給電装置の一部の概略を示す図。The figure which shows the outline of a part of the wireless power feeding apparatus of 2nd Embodiment.
　（第１実施形態）
　以下、無線給電装置の第１実施形態を図１～図５に従って説明する。
　図１には、本実施形態の無線給電装置３０を搭載する車両１０が図示されている。車両１０は、複数の車輪１２，１３，１４，１５と、各車輪１２～１５にそれぞれに対応する複数の制動機構２０Ａ，２０Ｂとを備えている。各制動機構２０Ａ，２０Ｂは、対応する車輪１２～１５と一体回転する回転体２１に摩擦材２２を押し付ける。これにより、車輪１２～１５に摩擦制動力を付与することができる。図１に示す例では、車輪１２及び車輪１３に対しては制動機構２０Ａがそれぞれ設けられている。また、車輪１４及び車輪１５に対しては制動機構２０Ｂがそれぞれ設けられている。各制動機構２０Ｂは、電気モータ２３の駆動量に応じた摩擦制動力を車輪１４，１５に付与する電動式制動機構である。そのため、各制動機構２０Ｂには、電気モータ２３を制御するモータ制御部２４が設けられている。 (First Embodiment)
Hereinafter, the first embodiment of the wireless power feeding device will be described with reference to FIGS. 1 to 5.
FIG. 1 shows a vehicle 10 equipped with the wireless power feeding device 30 of the present embodiment. The vehicle 10 includes a plurality of wheels 12, 13, 14, 15 and a plurality of braking mechanisms 20A, 20B corresponding to the wheels 12 to 15, respectively. The braking mechanisms 20A and 20B press the friction material 22 against the rotating body 21 that rotates integrally with the corresponding wheels 12 to 15. As a result, frictional braking force can be applied to the wheels 12 to 15. In the example shown in FIG. 1, a braking mechanism 20A is provided for each of the wheels 12 and 13. Further, a braking mechanism 20B is provided for each of the wheel 14 and the wheel 15. Each braking mechanism 20B is an electric braking mechanism that applies frictional braking force corresponding to the driving amount of the electric motor 23 to the wheels 14 and 15. Therefore, each braking mechanism 20B is provided with a motor control unit 24 that controls the electric motor 23.
　無線給電装置３０は、送電装置３１と、複数の受電装置４０Ａ，４０Ｂとを備えている。図１及び図２に示すように、送電装置３１は、車両１０の車体１１に固定されている支持台３２と、支持台３２に回転可能な状態で支持されている送電コイル３４とを備えている。支持台３２は、送電コイル３４の中心軸線３４ｂと直交する方向に延びる回転軸３３を回転可能な状態で支持している。例えば、回転軸３３は、車両上下方向に延びている。そして、回転軸３３に送電コイル３４が固定されている。そのため、送電コイル３４は、回転軸３３と一体回転する。つまり、送電コイル３４の回転軸線３４ａは、送電コイル３４の中心軸線３４ｂと直交している。言い換えると、送電コイル３４は、回転軸線３４ａに直交する仮想平面上で中心軸線３４ｂが回転できる。 The wireless power feeding device 30 includes a power transmitting device 31 and a plurality of power receiving devices 40A and 40B. As shown in FIGS. 1 and 2, the power transmission device 31 includes a support base 32 fixed to the vehicle body 11 of the vehicle 10 and a power transmission coil 34 rotatably supported by the support base 32. There is. The support base 32 rotatably supports a rotating shaft 33 extending in a direction orthogonal to the central axis 34b of the power transmission coil 34. For example, the rotation shaft 33 extends in the vertical direction of the vehicle. Then, the power transmission coil 34 is fixed to the rotating shaft 33. Therefore, the power transmission coil 34 rotates integrally with the rotating shaft 33. That is, the rotation axis 34a of the power transmission coil 34 is orthogonal to the central axis 34b of the power transmission coil 34. In other words, the power transmission coil 34 can rotate the central axis 34b on a virtual plane orthogonal to the rotation axis 34a.
　送電装置３１は、送電コイル３４に給電する給電部３５を備えている。給電部３５は、車載されたバッテリ１６の直流電圧を交流電圧に変換する変換回路３５１を有している。そのため、送電コイル３４には交流電流が流れる。送電コイル３４に電流が流されるとされることにより、電流に応じた磁界が発生する。すると、図２に破線矢印で示すように、送電コイル３４の内側を磁束が通る。 The power transmission device 31 includes a power supply unit 35 that supplies power to the power transmission coil 34. The power feeding unit 35 has a conversion circuit 351 that converts the DC voltage of the on-board battery 16 into an AC voltage. Therefore, an alternating current flows through the power transmission coil 34. When a current is passed through the power transmission coil 34, a magnetic field corresponding to the current is generated. Then, as shown by the broken line arrow in FIG. 2, the magnetic flux passes through the inside of the power transmission coil 34.
　アクチュエータ３６は、回転軸３３及び送電コイル３４を回転させる際の動力源である。給電制御部３７は、アクチュエータ３６の制御により送電コイル３４の回転角θを調整する。送電装置３１は、アクチュエータ３６と給電制御部３７とを備えている。アクチュエータ３６としては、例えば、電気モータを挙げる。 The actuator 36 is a power source for rotating the rotating shaft 33 and the power transmission coil 34. The power supply control unit 37 adjusts the rotation angle θ of the power transmission coil 34 by controlling the actuator 36. The power transmission device 31 includes an actuator 36 and a power supply control unit 37. Examples of the actuator 36 include an electric motor.
　図３に示すように、各受電装置４０Ａ，４０Ｂは、受電コイル４１と、誘起電圧によって充電される充電部４３とを有している。充電部４３は、電力を蓄えたり、電力を電力供給対象に供給したりする。充電部４３としては、例えば、コンデンサ及び二次電池を挙げる。 As shown in FIG. 3, each of the power receiving devices 40A and 40B has a power receiving coil 41 and a charging unit 43 charged by an induced voltage. The charging unit 43 stores electric power and supplies electric power to the electric power supply target. Examples of the charging unit 43 include a capacitor and a secondary battery.
　受電コイル４１では、給電部３５から送電コイル３４への給電により、磁界の発生によって誘起電圧が発生する。送電コイル３４が給電される時には、送電コイル３４に交流電流が供給される。よって、受電コイル４１では交流電圧が誘起電圧として発生する。本実施形態では、各受電装置４０Ａ，４０Ｂは、受電コイル４１で発生した交流電圧を直流電圧に変換する整流回路４２を有している。そして、整流回路４２によって交流から直流に変換された電圧に基づき、充電部４３が充電される。 In the power receiving coil 41, an induced voltage is generated by the generation of a magnetic field due to the power supplied from the power feeding unit 35 to the power transmitting coil 34. When the power transmission coil 34 is fed, an alternating current is supplied to the power transmission coil 34. Therefore, in the power receiving coil 41, an AC voltage is generated as an induced voltage. In the present embodiment, each of the power receiving devices 40A and 40B has a rectifier circuit 42 that converts the AC voltage generated by the power receiving coil 41 into a DC voltage. Then, the charging unit 43 is charged based on the voltage converted from alternating current to direct current by the rectifier circuit 42.
　図１に示すように、受電装置４０Ａ，４０Ｂは、制動機構２０Ｂに設けられている。充電部４３は、制動機構２０Ｂの電源として機能する。そして、制動機構２０Ｂでは、充電部４３からの給電によってモータ制御部２４を動作させたり、電気モータ２３を駆動させたりすることができる。図１に示す例では、車輪１４用の制動機構２０Ｂに第１受電装置４０Ａが設けられている。車輪１５用の制動機構２０Ｂに第２受電装置４０Ｂが設けられている。よって、車輪１４が第１車輪に相当する。車輪１５が第２車輪に相当する。 As shown in FIG. 1, the power receiving devices 40A and 40B are provided in the braking mechanism 20B. The charging unit 43 functions as a power source for the braking mechanism 20B. Then, in the braking mechanism 20B, the motor control unit 24 can be operated or the electric motor 23 can be driven by the power supply from the charging unit 43. In the example shown in FIG. 1, the braking mechanism 20B for the wheel 14 is provided with the first power receiving device 40A. A second power receiving device 40B is provided on the braking mechanism 20B for the wheel 15. Therefore, the wheel 14 corresponds to the first wheel. The wheel 15 corresponds to the second wheel.
　無線給電の方式としては、電磁誘導方式及び磁界共鳴方式などを挙げることができる。ここでは、電磁誘導方式で受電装置４０Ａ，４０Ｂの受電コイル４１に誘起電圧を発生させる場合について説明する。電磁誘導方式では、送電コイル３４への給電によって発生した磁束を受電コイル４１の内側を通過させる。これにより、誘起電圧を発生させることができる。磁束を受電コイル４１の内側を通過させるためには、送電コイル３４の中心軸線３４ｂと、受電コイル４１の中心軸線４１ａとの位置合わせが必要である。そのため、　 Examples of the wireless power supply method include an electromagnetic induction method and a magnetic field resonance method. Here, a case where an induced voltage is generated in the power receiving coil 41 of the power receiving devices 40A and 40B by the electromagnetic induction method will be described. In the electromagnetic induction method, the magnetic flux generated by the power supply to the power transmission coil 34 is passed through the inside of the power reception coil 41. Thereby, the induced voltage can be generated. In order for the magnetic flux to pass through the inside of the power receiving coil 41, it is necessary to align the central axis 34b of the power transmission coil 34 with the central axis 41a of the power receiving coil 41. so that,
電磁誘導方式を採用する場合、送電コイル３４と各受電コイル４１とを図４に示すように配置することが好ましい。図４では、一点鎖線は、受電コイル４１の中心軸線４１ａをしめしている。送電コイル３４の回転軸線３４ａが、各受電コイル４１の中心軸線４１ａと直交している。規定点Ｐ１は、各受電コイル４１の中心軸線４１ａが交差する点である。送電コイル３４の回転軸線３４ａが規定点Ｐ１上に位置している。送電コイル３４及び各受電コイル４１は、回転軸線３４ａに直交する上記仮想平面に中心軸線３４ｂ，４１ａが沿うように配置されている。 When the electromagnetic induction method is adopted, it is preferable to arrange the power transmission coil 34 and each power receiving coil 41 as shown in FIG. In FIG. 4, the alternate long and short dash line indicates the central axis 41a of the power receiving coil 41. The rotation axis 34a of the power transmission coil 34 is orthogonal to the central axis 41a of each power reception coil 41. The specified point P1 is a point where the central axis 41a of each power receiving coil 41 intersects. The rotation axis 34a of the power transmission coil 34 is located on the specified point P1. The power transmission coil 34 and each power receiving coil 41 are arranged so that the central axes 34b and 41a are along the virtual plane orthogonal to the rotation axis 34a.
これにより、図４に示すように、送電コイル３４の回転角θを第１回転角θ１とする場合、第１受電装置４０Ａの受電コイル４１の中心軸線４１ａの延長線上に、中心軸線３４ｂを配置することができる。また、送電コイル３４の回転角θを第２回転角θ２とする場合、第２受電装置４０Ｂの受電コイル４１の中心軸線４１ａの延長線上に、中心軸線３４ｂを配置することができる。 As a result, as shown in FIG. 4, when the rotation angle θ of the power transmission coil 34 is the first rotation angle θ1, the central axis 34b is arranged on the extension line of the central axis 41a of the power receiving coil 41 of the first power receiving device 40A. can do. Further, when the rotation angle θ of the power transmission coil 34 is set to the second rotation angle θ2, the central axis 34b can be arranged on the extension line of the central axis 41a of the power receiving coil 41 of the second power receiving device 40B.
　図４に示す第１回転角領域Ｒ１とは、第１回転角θ１を含む送電コイル３４の回転角θの領域である。回転角θが第１回転角領域Ｒ１内の回転角である状況下で送電コイル３４に給電が行われた場合がある。、この場合、第１受電装置４０Ａの受電コイル４１で発生する誘起電圧の大きさが第１受電装置４０Ａ以外の受電装置の受電コイル４１で発生する誘起電圧の大きさよりも大きい。なお、第１回転角領域Ｒ１の上限となる回転角及び下限となる回転角の双方は、実験やシミュレーションなどによって予め設定される。 The first rotation angle region R1 shown in FIG. 4 is a region of the rotation angle θ of the power transmission coil 34 including the first rotation angle θ1. Power may be supplied to the power transmission coil 34 under the condition that the rotation angle θ is the rotation angle within the first rotation angle region R1. In this case, the magnitude of the induced voltage generated by the power receiving coil 41 of the first power receiving device 40A is larger than the magnitude of the induced voltage generated by the power receiving coil 41 of the power receiving device other than the first power receiving device 40A. Both the upper limit rotation angle and the lower limit rotation angle of the first rotation angle region R1 are preset by experiments, simulations, and the like.
　図４に示す第２回転角領域Ｒ２とは、第２回転角θ２を含む送電コイル３４の回転角θの領域である。回転角θが第２回転角領域Ｒ２内の回転角である状況下で送電コイル３４に給電が行われた場合がある。この場合、第２受電装置４０Ｂの受電コイル４１で発生する誘起電圧の大きさが第２受電装置４０Ｂ以外の受電装置の受電コイル４１で発生する誘起電圧の大きさよりも大きい。なお、第２回転角領域Ｒ２の上限となる回転角及び下限となる回転角の双方は、実験やシミュレーションなどによって予め設定される。 The second rotation angle region R2 shown in FIG. 4 is a region of the rotation angle θ of the power transmission coil 34 including the second rotation angle θ2. Power may be supplied to the power transmission coil 34 under the condition that the rotation angle θ is the rotation angle in the second rotation angle region R2. In this case, the magnitude of the induced voltage generated by the power receiving coil 41 of the second power receiving device 40B is larger than the magnitude of the induced voltage generated by the power receiving coil 41 of the power receiving device other than the second power receiving device 40B. Both the upper limit rotation angle and the lower limit rotation angle of the second rotation angle region R2 are preset by experiments, simulations, and the like.
　次に、図５を参照し、各受電装置４０Ａ，４０Ｂの少なくとも１つで充電部４３に充電させる際に送電装置３１の給電制御部３７が実行する処理の流れについて説明する。
　はじめに、ステップＳ１１において、充電対象となる充電部４３を有する受電装置４０Ａ，４０Ｂが決定される。以降の記載において、充電対象となる充電部４３を有する受電装置のことを、対象受電装置ともいう。対象受電装置が決定されると、次のステップＳ１２において、対象受電装置と送電装置３１との間で無線給電の準備処理が実行される。この準備処理は、、送電コイル３４の回転角θを、対象受電装置に応じた角度に調整することである。送電コイル３４は、アクチュエータ３６の駆動により、回転させられる。例えば対象受電装置が第１受電装置４０Ａである場合、送電コイル３４の回転角θが、第１回転角領域Ｒ１内の角度とされる。この際、回転角θは、第１回転角領域Ｒ１内の角度であれば第１回転角θ１と等しくなくてもよい。しかし、最良の形態は、回転角θを第１回転角θ１と等しくすることである。 Next, with reference to FIG. 5, a flow of processing executed by the power supply control unit 37 of the power transmission device 31 when charging the charging unit 43 with at least one of the power receiving devices 40A and 40B will be described.
First, in step S11, the power receiving devices 40A and 40B having the charging unit 43 to be charged are determined. In the following description, the power receiving device having the charging unit 43 to be charged is also referred to as a target power receiving device. When the target power receiving device is determined, in the next step S12, the preparation process for wireless power supply is executed between the target power receiving device and the power transmission device 31. This preparatory process is to adjust the rotation angle θ of the power transmission coil 34 to an angle corresponding to the target power receiving device. The power transmission coil 34 is rotated by driving the actuator 36. For example, when the target power receiving device is the first power receiving device 40A, the rotation angle θ of the power transmission coil 34 is set as the angle within the first rotation angle region R1. At this time, the rotation angle θ does not have to be equal to the first rotation angle θ1 as long as it is an angle within the first rotation angle region R1. However, the best form is to make the rotation angle θ equal to the first rotation angle θ1.
　準備処理が終了すると、処理が次のステップＳ１３に移行する。ステップＳ１３において、対象受電装置の充電部４３を充電させる無線充電処理が実行される。すなわち、無線充電処理では、送電コイル３４に給電される。無線充電処理の終了条件が成立すると、無線充電処理が終了される。そして、一連の処理が終了する。 When the preparation process is completed, the process proceeds to the next step S13. In step S13, a wireless charging process for charging the charging unit 43 of the target power receiving device is executed. That is, in the wireless charging process, power is supplied to the power transmission coil 34. When the end condition of the wireless charging process is satisfied, the wireless charging process is terminated. Then, a series of processes is completed.
　無線充電処理の終了条件としては、例えば、送電コイル３４への給電の継続時間が所定時間以上になったこと、及び、対象受電装置の充電部４３の充電量が所定充電量以上になったことを挙げることができる。 The termination conditions of the wireless charging process include, for example, that the duration of power supply to the power transmission coil 34 is equal to or longer than a predetermined time, and that the charging amount of the charging unit 43 of the target power receiving device is equal to or longer than the predetermined charging amount. Can be mentioned.
　次に、本実施形態の無線給電装置の使用例について説明する。
　第１使用例では、対象受電装置が順番に変更する。例えば、第１受電装置４０Ａを対象受電装置とし、無線充電処理が実行される。このとき、送電装置３１では、給電部３５によって送電コイル３４に交流電流が流れる。その結果、第１受電装置４０Ａでは、受電コイル４１に誘起電圧が発生する。これにより、第１受電装置４０Ａの充電部４３が充電される。そして、第１受電装置４０Ａに対する無線充電処理の終了条件が成立したとき、送電コイル３４への給電が終了する。、その後、対象受電装置が第２受電装置４０Ｂに変更される。そして、無線充電処理が実行される。すると、送電装置３１では、給電部３５によって送電コイル３４に交流電流が流れはじめるため、第２受電装置４０Ｂでは、受電コイル４１に誘起電圧が発生する。これにより、第２受電装置４０Ｂの充電部４３が充電される。そして、第２受電装置４０Ｂに対する無線充電処理の終了条件が成立したとき、送電コイル３４への給電が終了する。その後、対象受電装置が第１受電装置４０Ａに変更される。上述の処理が繰り返し実行される。 Next, an example of using the wireless power feeding device of this embodiment will be described.
In the first usage example, the target power receiving devices are changed in order. For example, the wireless charging process is executed with the first power receiving device 40A as the target power receiving device. At this time, in the power transmission device 31, an alternating current flows through the power transmission coil 34 by the power supply unit 35. As a result, in the first power receiving device 40A, an induced voltage is generated in the power receiving coil 41. As a result, the charging unit 43 of the first power receiving device 40A is charged. Then, when the end condition of the wireless charging process for the first power receiving device 40A is satisfied, the power supply to the power transmission coil 34 ends. After that, the target power receiving device is changed to the second power receiving device 40B. Then, the wireless charging process is executed. Then, in the power transmission device 31, an alternating current starts to flow in the power transmission coil 34 by the power supply unit 35, so that an induced voltage is generated in the power reception coil 41 in the second power reception device 40B. As a result, the charging unit 43 of the second power receiving device 40B is charged. Then, when the end condition of the wireless charging process for the second power receiving device 40B is satisfied, the power supply to the power transmission coil 34 ends. After that, the target power receiving device is changed to the first power receiving device 40A. The above process is repeatedly executed.
　各充電部４３における蓄電量を監視することができる場合、第１使用例ではなく、以下に示す第２使用例を採用してもよい。第２使用例では、蓄電量が閾値未満となった充電部４３がある場合、当該充電部４３を有する受電装置が対象受電装置に決定される。そして、当該受電装置と送電装置３１との間で無線給電され、ひいては当該受電装置の充電部４３の充電がされる。蓄電量が閾値未満となる充電部４３がないときには、図５に示した一連の処理が実行されないこととなる。 If the amount of electricity stored in each charging unit 43 can be monitored, the second usage example shown below may be adopted instead of the first usage example. In the second use example, when there is a charging unit 43 whose storage amount is less than the threshold value, the power receiving device having the charging unit 43 is determined as the target power receiving device. Then, wireless power is supplied between the power receiving device and the power transmitting device 31, and the charging unit 43 of the power receiving device is charged. When there is no charging unit 43 whose storage amount is less than the threshold value, the series of processes shown in FIG. 5 is not executed.
　本実施形態の作用及び効果について説明する。
　（１）本実施形態では、１つの送電コイル３４の回転角θを調整することにより、第１受電装置４０Ａの充電部４３を充電させたり、第２受電装置４０Ｂの充電部４３を充電させたりすることができる。すなわち、第１受電装置４０Ａの充電部４３を充電させる場合、送電コイル３４の回転角θが第１回転角領域Ｒ１内の角度とされ、送電コイル３４に給電が行われる。これにより、第１受電装置４０Ａの受電コイル４１で誘起電圧が発生し、当該誘起電圧に基づいて充電部４３が充電される。この際、第２受電装置４０Ｂの受電コイル４１でも誘起電圧が発生することがある。しかし、この第２受電装置４０Ｂでの誘起電圧の大きさは、第１受電装置４０Ａでの誘起電圧の大きさよりも小さい。よって、第２受電装置４０Ｂの充電部４３の充電量は第１受電装置４０Ａの充電部４３の充電量よりも少ない。 The operation and effect of this embodiment will be described.
(1) In the present embodiment, by adjusting the rotation angle θ of one power transmission coil 34, the charging unit 43 of the first power receiving device 40A can be charged, or the charging unit 43 of the second power receiving device 40B can be charged. can do. That is, when charging the charging unit 43 of the first power receiving device 40A, the rotation angle θ of the power transmission coil 34 is set to an angle within the first rotation angle region R1, and power is supplied to the power transmission coil 34. As a result, an induced voltage is generated in the power receiving coil 41 of the first power receiving device 40A, and the charging unit 43 is charged based on the induced voltage. At this time, an induced voltage may also be generated in the power receiving coil 41 of the second power receiving device 40B. However, the magnitude of the induced voltage in the second power receiving device 40B is smaller than the magnitude of the induced voltage in the first power receiving device 40A. Therefore, the charge amount of the charging unit 43 of the second power receiving device 40B is smaller than the charging amount of the charging unit 43 of the first power receiving device 40A.
　一方、第２受電装置４０Ｂの充電部４３を充電させる場合、送電コイル３４の回転角θが第２回転角領域Ｒ２内の角度とされ、その上で送電コイル３４に給電される。これにより、第２受電装置４０Ｂの受電コイル４１で誘起電圧が発生し、当該誘起電圧によって充電部４３が充電される。なお、この際、第１受電装置４０Ａの受電コイル４１でも誘起電圧が発生することがある。しかし、この場合、第１受電装置４０Ａでの誘起電圧の大きさは、第２受電装置４０Ｂでの誘起電圧の大きさよりも小さい。よって、第１受電装置４０Ａの充電部４３の充電量は第２受電装置４０Ｂの充電部４３の充電量よりも少ない。 On the other hand, when charging the charging unit 43 of the second power receiving device 40B, the rotation angle θ of the power transmission coil 34 is set to an angle within the second rotation angle region R2, and then power is supplied to the power transmission coil 34. As a result, an induced voltage is generated in the power receiving coil 41 of the second power receiving device 40B, and the charging unit 43 is charged by the induced voltage. At this time, an induced voltage may also be generated in the power receiving coil 41 of the first power receiving device 40A. However, in this case, the magnitude of the induced voltage in the first power receiving device 40A is smaller than the magnitude of the induced voltage in the second power receiving device 40B. Therefore, the charge amount of the charging unit 43 of the first power receiving device 40A is smaller than the charging amount of the charging unit 43 of the second power receiving device 40B.
　したがって、無線給電装置３０を複数の受電装置４０Ａ，４０Ｂを備える構成にしても、送電コイル３４の数の増大を抑制できる。より詳しくは、１つの送電コイル３４でもって複数の受電装置４０Ａ，４０Ｂで充電するできる。 Therefore, even if the wireless power feeding device 30 is provided with a plurality of power receiving devices 40A and 40B, an increase in the number of power transmission coils 34 can be suppressed. More specifically, one power transmission coil 34 can be charged by a plurality of power receiving devices 40A and 40B.
　（２）送電コイル３４の回転軸線３４ａは、送電コイル３４の中心軸線３４ｂ及び各受電コイル４１の中心軸線４１ａと直交している。そのため、回転角θの調整により、受電コイル４１の中心軸線４１ａ上に送電コイル３４の中心軸線３４ｂを重ねやすくなる。すなわち、対象受電装置の受電コイル４１において効率よく誘起電圧を発生させることができ、ひいては対象受電装置の充電部４３を効率よく充電させることができる。 (2) The rotating axis 34a of the power transmission coil 34 is orthogonal to the central axis 34b of the power transmission coil 34 and the central axis 41a of each power receiving coil 41. Therefore, by adjusting the rotation angle θ, it becomes easy to superimpose the central axis 34b of the power transmission coil 34 on the central axis 41a of the power receiving coil 41. That is, the induced voltage can be efficiently generated in the power receiving coil 41 of the target power receiving device, and the charging unit 43 of the target power receiving device can be efficiently charged.
　（３）本実施形態では、送電コイル３４の回転により、第１受電装置４０Ａの充電部４３を充電させたり、第２受電装置４０Ｂの充電部４３を充電させたりすることができる。送電コイル３４を車両１０内でスライド移動させ、充電対象となる充電部４３を適宜切り替える場合と比較すると、必要となるスペースが小さい。特に、車両１０という限られたスペース内で有利である。 (3) In the present embodiment, the charging unit 43 of the first power receiving device 40A can be charged or the charging unit 43 of the second power receiving device 40B can be charged by the rotation of the power transmission coil 34. Compared with the case where the power transmission coil 34 is slid and moved in the vehicle 10 and the charging unit 43 to be charged is appropriately switched, the required space is small. In particular, it is advantageous in the limited space of the vehicle 10.
　（第２実施形態）
無線給電装置の第２実施形態を図６に従って説明する。以下の説明においては、第１実施形態と相違している部分について主に説明するものとし、第１実施形態と同一又は相当する部材構成には同一符号を付して重複説明を省略するものとする。 (Second Embodiment)
A second embodiment of the wireless power feeding device will be described with reference to FIG. In the following description, the parts that are different from the first embodiment will be mainly described, and the same or corresponding member configurations as those in the first embodiment will be designated by the same reference numerals and duplicate description will be omitted. To do.
　図６に示すように、本実施形態の無線給電装置３０は、送電装置３１、第１受電装置４０Ａ及び第２受電装置４０Ｂに加え、第３受電装置４０Ｃと中継装置５０とを備えている。例えば、第３受電装置４０Ｃは、送電装置３１から見て第１受電装置４０Ａ及び第２受電装置４０Ｂよりも離れた位置に配置されている。なお、第３受電装置４０Ｃの構成は第１受電装置４０Ａ及び第２受電装置４０Ｂの構成と略同等であるため、第３受電装置４０Ｃの構成についての説明は割愛する。 As shown in FIG. 6, the wireless power feeding device 30 of the present embodiment includes a third power receiving device 40C and a relay device 50 in addition to the power transmitting device 31, the first power receiving device 40A, and the second power receiving device 40B. For example, the third power receiving device 40C is arranged at a position farther from the first power receiving device 40A and the second power receiving device 40B when viewed from the power transmitting device 31. Since the configuration of the third power receiving device 40C is substantially the same as the configuration of the first power receiving device 40A and the second power receiving device 40B, the description of the configuration of the third power receiving device 40C is omitted.
　中継装置５０は、中継コイル５１を有している。中継コイル５１は、給電部３５から送電コイル３４への給電に伴う磁界の発生によって誘起電圧を発生する。中継コイル５１の中心軸線５１ａは、送電装置３１の送電コイル３４の回転軸線３４ａと直交している。また、中継コイル５１は、第３受電装置４０Ｃの受電コイル４１との間で無線給電が可能な状態で配置されている。すなわち、中継コイル５１に磁界が発生したときに、当該磁界の影響によって第３受電装置４０Ｃの受電コイル４１で誘起電圧が発生するように、中継コイル５１が配置されている。 The relay device 50 has a relay coil 51. The relay coil 51 generates an induced voltage by generating a magnetic field accompanying power feeding from the power feeding unit 35 to the power transmission coil 34. The central axis 51a of the relay coil 51 is orthogonal to the rotation axis 34a of the power transmission coil 34 of the power transmission device 31. Further, the relay coil 51 is arranged in a state where wireless power supply is possible with the power receiving coil 41 of the third power receiving device 40C. That is, the relay coil 51 is arranged so that when a magnetic field is generated in the relay coil 51, an induced voltage is generated in the power receiving coil 41 of the third power receiving device 40C due to the influence of the magnetic field.
　本実施形態では、送電コイル３４の回転角θを第３回転角θ３とすることにより、中継コイル５１の中心軸線５１ａの延長線上に、送電コイル３４の中心軸線３４ｂを配置することができる。図６に示す第３回転角領域Ｒ３とは、第３回転角θ３を含む送電コイル３４の回転角θの領域である。回転角θが第３回転角領域Ｒ３内の回転角である状況下で送電コイル３４に給電された場合、第３受電装置４０Ｃの受電コイル４１で発生する誘起電圧の大きさが、第１受電装置４０Ａの受電コイル４１で発生する誘起電圧の大きさ及び第２受電装置４０Ｂの受電コイル４１で発生する誘起電圧の大きさの双方よりも大きくできる。なお、第３回転角領域Ｒ３の上限となる回転角及び下限となる回転角の双方は、実験やシミュレーションなどによって予め設定される。 In the present embodiment, by setting the rotation angle θ of the power transmission coil 34 to the third rotation angle θ3, the central axis 34b of the power transmission coil 34 can be arranged on the extension line of the central axis 51a of the relay coil 51. The third rotation angle region R3 shown in FIG. 6 is a region of the rotation angle θ of the power transmission coil 34 including the third rotation angle θ3. When power is supplied to the power transmission coil 34 under the condition that the rotation angle θ is the rotation angle within the third rotation angle region R3, the magnitude of the induced voltage generated by the power receiving coil 41 of the third power receiving device 40C is the first power receiving. It can be larger than both the magnitude of the induced voltage generated by the power receiving coil 41 of the device 40A and the magnitude of the induced voltage generated by the power receiving coil 41 of the second power receiving device 40B. Both the upper limit rotation angle and the lower limit rotation angle of the third rotation angle region R3 are preset by experiments, simulations, and the like.
　図５に示した一連の処理において、ステップＳ１１で対象受電装置として第３受電装置４０Ｃが決定された場合、次のステップＳ１２では、準備処理によって、送電コイル３４の回転角θが第３回転角領域Ｒ３の角度とされる。この際、回転角θは、第３回転角領域Ｒ３内の角度であれば第３回転角θ３と等しくなくてもよい。しかし、最良の形態は、回転角θを第３回転角θ３と等しい。 In the series of processes shown in FIG. 5, when the third power receiving device 40C is determined as the target power receiving device in step S11, in the next step S12, the rotation angle θ of the power transmission coil 34 is changed to the third rotation angle by the preparatory process. It is the angle of the region R3. At this time, the rotation angle θ does not have to be equal to the third rotation angle θ3 as long as it is an angle within the third rotation angle region R3. However, in the best form, the rotation angle θ is equal to the third rotation angle θ3.
　準備処理が終了すると、次のステップＳ１３において、無線充電処理によって、送電コイル３４に給電される。送電コイル３４へ給電されると、磁束が中継コイル５１の内側を通る。つまり、中継コイル５１で誘起電圧が発生する。これにより、中継コイル５１に電流が流れるため、中継コイル５１磁界が発生する。この磁界の発生によって第３受電装置４０Ｃの受電コイル４１の内側を磁束が通るようになり、第３受電装置４０Ｃの受電コイル４１で誘起電圧が発生する。その結果、第３受電装置４０Ｃでは、受電コイル４１で発生した誘起電圧に基づいて充電部４３が充電される。すなわち、送電コイル３４の回転角θを調整することにより、送電装置３１と第３受電装置４０Ｃとの間で中継コイル５１を経由した無線給電ができる。 When the preparation process is completed, power is supplied to the power transmission coil 34 by the wireless charging process in the next step S13. When power is supplied to the power transmission coil 34, the magnetic flux passes through the inside of the relay coil 51. That is, an induced voltage is generated in the relay coil 51. As a result, a current flows through the relay coil 51, so that a magnetic field of the relay coil 51 is generated. Due to the generation of this magnetic field, magnetic flux passes through the inside of the power receiving coil 41 of the third power receiving device 40C, and an induced voltage is generated in the power receiving coil 41 of the third power receiving device 40C. As a result, in the third power receiving device 40C, the charging unit 43 is charged based on the induced voltage generated by the power receiving coil 41. That is, by adjusting the rotation angle θ of the power transmission coil 34, wireless power supply can be performed between the power transmission device 31 and the third power receiving device 40C via the relay coil 51.
　（変更例）
　上記各実施形態は、以下のように変更して実施することができる。上記各実施形態及び以下の変更例は、技術的に矛盾しない範囲で互いに組み合わせて実施することができる。 (Change example)
Each of the above embodiments can be modified and implemented as follows. Each of the above embodiments and the following modified examples can be implemented in combination with each other within a technically consistent range.
　上記第２実施形態において、中継コイル５１を、以下に示す２つの条件（Ａ），（Ｂ）のうち何れか一方の条件を満たすように配置してもよい。
（Ａ）回転角θが第３回転角領域Ｒ３内の回転角である状況下で送電コイル３４に給電された場合、第３受電装置４０Ｃの受電コイル４１で発生する誘起電圧の大きさを、第１受電装置４０Ａの受電コイル４１で発生する誘起電圧の大きさよりも大きく、第２受電装置４０Ｂの受電コイル４１で発生する誘起電圧の大きさ以下とすること。
（Ｂ）回転角θが第３回転角領域Ｒ３内の回転角である状況下で送電コイル３４に給電された場合、第３受電装置４０Ｃの受電コイル４１で発生する誘起電圧の大きさを、第２受電装置４０Ｂの受電コイル４１で発生する誘起電圧の大きさよりも大きく、第１受電装置４０Ａの受電コイル４１で発生する誘起電圧の大きさ以下とすること。 In the second embodiment, the relay coil 51 may be arranged so as to satisfy either one of the following two conditions (A) and (B).
(A) When the power is supplied to the power transmission coil 34 under the condition that the rotation angle θ is the rotation angle in the third rotation angle region R3, the magnitude of the induced voltage generated in the power receiving coil 41 of the third power receiving device 40C is determined. The magnitude of the induced voltage generated by the power receiving coil 41 of the first power receiving device 40A shall be larger than the magnitude of the induced voltage generated by the power receiving coil 41 of the second power receiving device 40B.
(B) When the power is supplied to the power transmission coil 34 under the condition that the rotation angle θ is the rotation angle in the third rotation angle region R3, the magnitude of the induced voltage generated in the power receiving coil 41 of the third power receiving device 40C is determined. The magnitude of the induced voltage generated by the power receiving coil 41 of the second power receiving device 40B shall be larger than the magnitude of the induced voltage generated by the power receiving coil 41 of the first power receiving device 40A.
　なお、条件（Ａ）を満たすように中継コイル５１を配置する場合、第３回転角領域Ｒ３の少なくとも一部が第２回転角領域Ｒ２と重複してもよい。一方、条件（Ｂ）を満たすように中継コイル５１を配置する場合、第３回転角領域Ｒ３の少なくとも一部が第１回転角領域Ｒ１と重複してもよい。 When the relay coil 51 is arranged so as to satisfy the condition (A), at least a part of the third rotation angle region R3 may overlap with the second rotation angle region R2. On the other hand, when the relay coil 51 is arranged so as to satisfy the condition (B), at least a part of the third rotation angle region R3 may overlap with the first rotation angle region R1.
　上記第２実施形態では、送電装置３１と第３受電装置４０Ｃとの間では、１つの中継コイル５１を経由して無線給電される。しかし、送電装置３１と第３受電装置４０Ｃとの間では、２つ以上の中継コイル５１を経由して無線給電が行われるようにしてもよい。 In the second embodiment, power is wirelessly supplied between the power transmission device 31 and the third power receiving device 40C via one relay coil 51. However, wireless power supply may be performed between the power transmission device 31 and the third power receiving device 40C via two or more relay coils 51.
　上記第２実施形態では、第３受電装置４０Ｃの充電部４３を充電させるために中継装置５０を、受電装置４０Ａ，４０Ｂとは別途設けている。しかし、第１受電装置４０Ａ及び第２受電装置４０Ｂのうちの何れか一方を中継装置として機能させるようにしてもよい。例えば第１受電装置４０Ａを中継装置として機能させる場合、第１受電装置４０Ａの受電コイル４１が中継コイルとして機能する。この場合、第１受電装置４０Ａの受電コイル４１で磁束を発生させることにより、第３受電装置４０Ｃの受電コイル４１で誘起電圧が発生するように、第１受電装置４０Ａと第３受電装置４０Ｃとを配置する必要がある。 In the second embodiment, the relay device 50 is provided separately from the power receiving devices 40A and 40B in order to charge the charging unit 43 of the third power receiving device 40C. However, either one of the first power receiving device 40A and the second power receiving device 40B may be made to function as a relay device. For example, when the first power receiving device 40A functions as a relay device, the power receiving coil 41 of the first power receiving device 40A functions as a relay coil. In this case, the first power receiving device 40A and the third power receiving device 40C so that the induced voltage is generated by the power receiving coil 41 of the third power receiving device 40C by generating the magnetic flux in the power receiving coil 41 of the first power receiving device 40A. Need to be placed.
　上記各実施形態では、送電コイル３４の中心軸線３４ｂが回転する仮想平面を第１仮想平面とした場合、各受電装置の受電コイル４１の中心軸線４１ａを第１仮想平面上に沿うようにしている。しかし、各受電装置のうちの少なくとも１つの受電装置の受電コイル４１の中心軸線４１ａを、送電コイル３４の回転軸線３４ａと直交させることができる場合、中心軸線４１ａは第１仮想平面に沿う必要はない。言い換えると、各受電装置のうちの少なくとも１つの受電装置の受電コイル４１の中心軸線４１ａの車両上下方向の位置が、送電コイル３４の中心軸線３４ｂの車両上下方向の位置とは多少ずれていてもよい。 In each of the above embodiments, when the virtual plane on which the central axis 34b of the power transmission coil 34 rotates is set as the first virtual plane, the central axis 41a of the power receiving coil 41 of each power receiving device is set along the first virtual plane. .. However, if the central axis 41a of the power receiving coil 41 of at least one of the power receiving devices can be orthogonal to the rotating axis 34a of the power transmitting coil 34, the central axis 41a needs to be along the first virtual plane. Absent. In other words, even if the position of the central axis 41a of the power receiving coil 41 of each power receiving device in the vehicle vertical direction is slightly different from the position of the central axis 34b of the power transmission coil 34 in the vehicle vertical direction. Good.
　受電装置４０Ａ，４０Ｂの充電部４３の電力を、モータ制御部２４に供給するのであれば、電力を電気モータ２３に供給しなくてもよい。この場合、充電部４３とは別の電源からの給電によって電気モータ２３は、駆動する。 If the electric power of the charging unit 43 of the power receiving devices 40A and 40B is supplied to the motor control unit 24, it is not necessary to supply the electric power to the electric motor 23. In this case, the electric motor 23 is driven by power supplied from a power source different from that of the charging unit 43.
　受電装置は、電力を必要とする装置であれば、制動機構２０Ｂ以外の車載装置に設けてもよい。例えば、他の車載装置としては、例えば、パワーウィンドウ装置を挙げることができる。また、受電装置を、車載の電子制御装置に設けてもよい。この場合、受電装置の充電部４３を、電子制御装置の電源とすることが可能となる。 The power receiving device may be provided in an in-vehicle device other than the braking mechanism 20B as long as it is a device that requires electric power. For example, as another in-vehicle device, for example, a power window device can be mentioned. Further, the power receiving device may be provided in an in-vehicle electronic control device. In this case, the charging unit 43 of the power receiving device can be used as a power source for the electronic control device.
　車両の動力源となる駆動モータがホイールに設けられるインホイールモータ方式が駆動方式として採用される車両に、無線給電装置３０を適用してもよい。この場合、受電装置の充電部４３を、駆動モータを制御するモータ制御装置の電源として利用したり、駆動モータの電源として利用したりすることができる。 The wireless power feeding device 30 may be applied to a vehicle in which an in-wheel motor system in which a drive motor as a power source of the vehicle is provided on the wheel is adopted as the drive system. In this case, the charging unit 43 of the power receiving device can be used as a power source for the motor control device that controls the drive motor, or can be used as a power source for the drive motor.
　車両以外の他の装置に、無線給電装置３０を設けてもよい。
　上記各実施形態では、１つの軸を中心に送電コイル３４を回転させるようにしている。しかし、２軸で送電コイル３４を回転させるようにしてもよいし、３軸で送電コイル３４を回転させるようにしてもよい。これにより、受電装置の配置の自由度が高くなる。 The wireless power feeding device 30 may be provided in a device other than the vehicle.
In each of the above embodiments, the power transmission coil 34 is rotated around one axis. However, the power transmission coil 34 may be rotated on two axes, or the power transmission coil 34 may be rotated on three axes. As a result, the degree of freedom in arranging the power receiving device is increased.
　無線給電装置は、２つ以上の受電装置を備えるのであれば、３つ以上の任意数の受電装置を備えるものであってもよい。
　無線給電装置３０を構成する複数の受電装置のうち、少なくとも一つの受電装置は、充電部４３を有していなくてもよい。充電部４３を有さない受電装置を、規定充電装置という。規定充電装置を備える車載装置において、無線給電装置３０による給電によって動作するものを給電対象部という。そして、規定充電装置を備える車載装置では、規定受電装置の受電コイル４１で誘起電圧が発生しているときに限って給電対象部を動作させることができる。そのため、規定充電装置を備える車載装置の給電対象部を動作させるときに、規定充電装置の受電コイル４１で誘起電圧を発生させることができるように、送電コイル３４の回転角θを調整することが好ましい。 The wireless power feeding device may include any number of three or more power receiving devices as long as it includes two or more power receiving devices.
Of the plurality of power receiving devices constituting the wireless power feeding device 30, at least one power receiving device does not have to have the charging unit 43. A power receiving device that does not have a charging unit 43 is called a specified charging device. An in-vehicle device provided with a specified charging device, which operates by power feeding by the wireless power feeding device 30, is referred to as a power feeding target unit. Then, in the in-vehicle device provided with the specified charging device, the power supply target unit can be operated only when the induced voltage is generated in the power receiving coil 41 of the specified power receiving device. Therefore, it is possible to adjust the rotation angle θ of the power transmission coil 34 so that the power receiving coil 41 of the specified charging device can generate an induced voltage when operating the power supply target portion of the in-vehicle device provided with the specified charging device. preferable.
　車両１０には、複数の無線給電装置３０を搭載してもよい。
　上記各実施形態では、電磁誘導方式での無線給電の例を説明している。しかし、無線給電の方式として、電磁誘導方式以外の他の方式を採用してもよい。他の方式としては、例えば磁気共鳴方式を挙げることができる。この場合、送電装置３１と第１受電装置４０Ａとの間で無線給電を行う場合の第１回転角領域Ｒ１として、磁気共鳴方式に対応した回転角θの領域が設定されることになる。同様に、送電装置３１と第２受電装置４０Ｂとの間で無線給電を行う場合の第２回転角領域Ｒ２として、磁気共鳴方式に対応した回転角θの領域が設定されることになる。 The vehicle 10 may be equipped with a plurality of wireless power feeding devices 30.
In each of the above embodiments, an example of wireless power feeding by the electromagnetic induction method is described. However, as the wireless power supply method, a method other than the electromagnetic induction method may be adopted. As another method, for example, a magnetic resonance method can be mentioned. In this case, a region having a rotation angle θ corresponding to the magnetic resonance method is set as the first rotation angle region R1 when wireless power is supplied between the power transmission device 31 and the first power receiving device 40A. Similarly, a region having a rotation angle θ corresponding to the magnetic resonance method is set as the second rotation angle region R2 when wireless power is supplied between the power transmission device 31 and the second power reception device 40B.
　給電制御部３７は、コンピュータプログラムに従って動作する１つ以上のプロセッサ、各種処理のうち少なくとも一部の処理を実行する専用のハードウェアなどの１つ以上の専用のハードウェア回路又はこれらの組み合わせを含む回路として構成し得る。専用のハードウェアとしては、例えば、特定用途向け集積回路であるＡＳＩＣを挙げることができる。プロセッサは、ＣＰＵ並びに、ＲＡＭ及びＲＯＭなどのメモリを含み、メモリは、処理をＣＰＵに実行させるように構成されたプログラムコード又は指令を格納している。メモリ、すなわち記憶媒体は、汎用又は専用のコンピュータでアクセスできるあらゆる利用可能な媒体を含む。 The power supply control unit 37 includes one or more dedicated hardware circuits such as one or more processors that operate according to a computer program, dedicated hardware that executes at least a part of various processes, or a combination thereof. It can be configured as a circuit. As the dedicated hardware, for example, an ASIC which is an integrated circuit for a specific application can be mentioned. The processor includes a CPU and a memory such as a RAM and a ROM, and the memory stores a program code or an instruction configured to cause the CPU to execute a process. Memory, or storage medium, includes any available medium accessible by a general purpose or dedicated computer.

Claims (6)

  1. 　送電装置と複数の受電装置とを備え、
    　前記送電装置は、給電されると磁界を発生する送電コイルと、前記送電コイルを回転可能な状態で支持する支持台と、前記送電コイルを回転させる際の動力源であるアクチュエータと、前記送電コイルに給電する給電部と、前記アクチュエータの制御により前記送電コイルの回転角を調整する給電制御部と、を有し、
    　複数の前記受電装置は、前記給電部から前記送電コイルへの給電に伴う磁界の発生によって誘起電圧を発生する受電コイルをそれぞれ有し、
    　第１回転角領域は、複数の前記受電装置のうちの第１受電装置の前記受電コイルで発生する誘起電圧の大きさが複数の前記受電装置のうちの前記第１受電装置以外の受電装置の前記受電コイルで発生する誘起電圧の大きさよりも大きい前記送電コイルの回転角の領域であり、第２回転角領域は、複数の前記受電装置のうちの第２受電装置の前記受電コイルで発生する誘起電圧の大きさが複数の前記受電装置のうちの前記第２受電装置以外の受電装置の前記受電コイルで発生する誘起電圧の大きさよりも大きい前記送電コイルの回転角の領域であり、
    　前記給電制御部は、前記第１受電装置の前記受電コイルで誘起電圧を発生させるときには前記送電コイルの回転角を前記第１回転角領域内の角度とし、前記第２受電装置の前記受電コイルで誘起電圧を発生させるときには前記送電コイルの回転角を前記第２回転角領域内の角度とする
    　無線給電装置。     Equipped with a power transmission device and multiple power receiving devices,
    The power transmission device includes a power transmission coil that generates a magnetic field when power is supplied, a support base that supports the power transmission coil in a rotatable state, an actuator that is a power source for rotating the power transmission coil, and the power transmission coil. It has a power feeding unit that feeds power to the power transmission coil and a power feeding control unit that adjusts the rotation angle of the power transmission coil by controlling the actuator.
    Each of the plurality of power receiving devices has a power receiving coil that generates an induced voltage by generating a magnetic field accompanying the power feeding from the power feeding unit to the power transmission coil.
    The first rotation angle region is a power receiving device other than the first power receiving device among the plurality of power receiving devices in which the magnitude of the induced voltage generated by the power receiving coil of the first power receiving device among the plurality of the power receiving devices is large. It is a region of the rotation angle of the power transmission coil that is larger than the magnitude of the induced voltage generated by the power receiving coil, and the second rotation angle region is generated in the power receiving coil of the second power receiving device among the plurality of the power receiving devices. It is a region of the rotation angle of the power transmission coil in which the magnitude of the induced voltage is larger than the magnitude of the induced voltage generated in the power receiving coil of the power receiving device other than the second power receiving device among the plurality of the power receiving devices.
    When the power supply control unit generates an induced voltage with the power receiving coil of the first power receiving device, the rotation angle of the power transmitting coil is set to an angle within the first rotation angle region, and the power receiving coil of the second power receiving device sets the rotation angle. A wireless power feeding device in which the rotation angle of the transmission coil is an angle within the second rotation angle region when an induced voltage is generated.
  2. 　前記送電コイルの回転軸線は、当該送電コイルの中心軸線と直交する
    　請求項１に記載の無線給電装置。     The wireless power feeding device according to claim 1, wherein the rotating axis of the power transmission coil is orthogonal to the central axis of the power transmission coil.
  3. 　前記送電装置及び複数の前記受電装置は、車両にそれぞれ設けられている
    　請求項１又は請求項２に記載の無線給電装置。     The wireless power feeding device according to claim 1 or 2, wherein the power transmitting device and the plurality of power receiving devices are provided in the vehicle, respectively.
  4. 　前記車両は、車輪に対する摩擦制動力を調整する制動機構として、電気モータの駆動量に応じた摩擦制動力を前記車輪に付与する電動式制動機構を備えるものであり、
    　前記第１受電装置は、前記車輪のうちの第１車輪用の前記電動式制動機構に設けられ、前記第２受電装置は、前記車輪のうちの第２車輪用の前記電動式制動機構に設けられ、前記送電装置の前記支持台は、前記車両の車体に固定されている
    　請求項３に記載の無線給電装置。     The vehicle is provided with an electric braking mechanism that applies a friction braking force corresponding to a driving amount of an electric motor to the wheels as a braking mechanism for adjusting the friction braking force with respect to the wheels.
    The first power receiving device is provided in the electric braking mechanism for the first wheel of the wheels, and the second power receiving device is provided in the electric braking mechanism for the second wheel of the wheels. The wireless power supply device according to claim 3, wherein the support base of the power transmission device is fixed to the vehicle body of the vehicle.
  5. 　前記給電部から前記送電コイルへの給電に伴う磁界の発生によって誘起電圧を発生する中継コイルを有する中継装置を備え、
    　前記中継装置は、前記中継コイルに電流が流れるときには、当該中継コイルに電流が流れることに起因して磁界を発生させるとともに、当該磁界の発生によって複数の前記受電装置のうちの第３受電装置の前記受電コイルに誘起電圧を発生させるものであり、
    第３回転角領域は、　前記給電部から前記送電コイルに給電された際に、前記第３受電装置の前記受電コイルで発生する誘起電圧の大きさが、前記第１受電装置の前記受電コイルで発生する誘起電圧の大きさ及び前記第２受電装置の前記受電コイルで発生する誘起電圧の大きさの少なくとも一方よりも大きい前記送電コイルの回転角の領域であり、
    　前記給電制御部は、前記第３受電装置の前記受電コイルで誘起電圧を発生させるときには前記送電コイルの回転角を前記第３回転角領域内の角度とする
    　請求項１～請求項４のうち何れか一項に記載の無線給電装置。     A relay device having a relay coil that generates an induced voltage by generating a magnetic field accompanying the power supply from the power feeding unit to the power transmission coil is provided.
    When a current flows through the relay coil, the relay device generates a magnetic field due to the current flowing through the relay coil, and the generation of the magnetic field causes the third power receiving device among the plurality of power receiving devices. It generates an induced voltage in the power receiving coil.
    In the third rotation angle region, the magnitude of the induced voltage generated by the power receiving coil of the third power receiving device when power is supplied from the power feeding unit to the power transmission coil is determined by the power receiving coil of the first power receiving device. It is a region of the rotation angle of the power transmission coil that is larger than at least one of the magnitude of the induced voltage generated and the magnitude of the induced voltage generated by the power receiving coil of the second power receiving device.
    Any of claims 1 to 4, wherein the power supply control unit sets the rotation angle of the power transmission coil as an angle within the third rotation angle region when the power receiving coil of the third power receiving device generates an induced voltage. The wireless power supply device according to item 1.
  6. 　複数の前記受電装置の少なくとも一つの前記受電装置は、前記受電コイルで発生した誘起電圧に基づいて充電される充電部を有する
    　請求項１～請求項５のうち何れか一項に記載の無線給電装置。     The wireless power supply according to any one of claims 1 to 5, wherein at least one of the plurality of power receiving devices has a charging unit that is charged based on an induced voltage generated by the power receiving coil. apparatus.
PCT/JP2020/038916 2019-10-17 2020-10-15 Wireless power feeding device WO2021075498A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018102093A (en) * 2016-12-21 2018-06-28 清水建設株式会社 Wireless power-transmission system and wireless power-transmission method
WO2018150678A1 (en) * 2017-02-17 2018-08-23 国立大学法人東京工業大学 Contactless power supply system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018102093A (en) * 2016-12-21 2018-06-28 清水建設株式会社 Wireless power-transmission system and wireless power-transmission method
WO2018150678A1 (en) * 2017-02-17 2018-08-23 国立大学法人東京工業大学 Contactless power supply system

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