JP2021027771A - Power reception apparatus and power transmission apparatus - Google Patents

Abstract

To provide a structure capable of efficiently cooling a power transmission apparatus and a power reception apparatus that have coils arranged to be laminated.SOLUTION: A power reception apparatus 30 of a non-contact power feeding system 10 that feeds power in a non-contact manner, comprises: a plurality of power reception coils 36u, 36v and 36w; and a housing H that accommodates the plurality of power reception coils 36u, 36v and 36w. The housing H has a cooling main body part 42 and a cover 50 that covers the power reception coils 36u, 36v and 36w. Each power reception coil 36u, 36v, 36w is provided with a cover opposed part 36d opposed to an inner face 50a of the cover 50 without interposing the other power reception coils 36u, 36v, 36w. The inner face 50a of the cover 50 is formed with an uneven configuration. A recessed part 52 recessed toward the power reception coils 36u, 36v and 36w is provided on an outer face 50d of the cover 50 at a position overlapped with the cover opposed part 36d of each power reception coil 36u, 36v, 36w in a lamination direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a power receiving device and a power transmitting device that transmit and receive AC power in a non-contact manner between a power transmitting device embedded in a road and a power receiving device attached to a vehicle.

Conventionally, as a non-contact power supply system that supplies power to the other party in a non-contact manner without using a power cord or a power transmission cable when charging an electric vehicle or the like, a system using magnetic field resonance or electromagnetic induction is known. In order to charge an electric vehicle or the like, it is necessary to transmit and receive a large amount of electric power, and loss, that is, heat generation tends to be large. Therefore, a cooling device may be provided in the power receiving device. For example, the cooling device of Patent Document 1 is provided outside the housing of the power receiving device, and heat is transferred from the housing. The cooling device is provided with a flow path for flowing water inside the cooling device, and the heat transferred from the housing is released to the water to cool the power receiving device.

JP-A-2018-93589

By the way, it is desirable that heat can be dissipated from the side where the cooling device is not provided, that is, the side where the power receiving device and the power transmitting device face each other. Further, when AC power is transmitted and received in a non-contact manner, the coil may be polymorphized in order to suppress power pulsation. Then, in order to save space, coils having multiple phases may be stacked and arranged. In this case, there is a problem that the power receiving coil arranged in the middle in the stacking direction is difficult to dissipate heat.

The present invention has been made in view of the above problems, and a main object thereof is to provide a structure for efficiently cooling a power transmitting device and a power receiving device having coils arranged in a laminated manner.

The first means is arranged in a stacked manner in the power receiving device of the non-contact power feeding system that supplies power in a non-contact manner between the power transmitting device buried in the ground and the power receiving device provided on the vehicle side. A plurality of power receiving coils which are flat coils and are displaced at predetermined intervals in a direction orthogonal to the stacking direction, and a housing for accommodating the plurality of power receiving coils so that their planes are parallel to the ground. The housing is attached to the vehicle, and is arranged on the ground side of the power receiving coil and the main body to which the power receiving coil is attached on the side opposite to the mounting surface of the vehicle. Each of the power receiving coils is provided with a cover facing portion facing the inner surface of the cover without interposing another power receiving coil, and the inner surface of the cover is provided with a cover facing portion. An uneven shape is formed so that the inner surface abuts on the cover facing portion of each power receiving coil, and the outer surface of the cover is located at a position overlapping the cover facing portion of each power receiving coil in the stacking direction. , A recess is provided on the power receiving coil side.

Heat can be transferred from the power receiving coil to the cover by forming an uneven shape on the inner surface of the cover so as to abut the cover facing portion of each power receiving coil. Then, on the outer surface of the cover, a recess recessed on the power receiving coil side is provided at a position overlapping the cover facing portion of each power receiving coil in the stacking direction. As a result, the thickness dimension of the cover at the position overlapping the cover facing portion of each power receiving coil can be reduced, and the heat of the power receiving coil can be easily released from the cover to the outside.

The second means is arranged in a laminated manner in the power transmission equipment of the non-contact power supply system that supplies power in a non-contact manner between the power transmission equipment buried in the road and the power reception equipment provided on the vehicle side. A plurality of power transmission coils which are flat coils and are displaced at predetermined intervals in a direction orthogonal to the stacking direction, and a housing for accommodating the plurality of power transmission coils so that their planes are parallel to the road. The housing is embedded in the road and is arranged on the ground side of the power transmission coil and the main body to which the power transmission coil is mounted on the side opposite to the mounting surface of the road. Each power transmission coil has a cover that covers the coil, and each power transmission coil is provided with a cover facing portion that faces the inner surface of the cover without interposing another power transmission coil, and the inner surface of the cover is provided with a cover facing portion. An uneven shape is formed so that the inner surface abuts on the cover facing portion of each power transmission coil, and the outer surface of the cover overlaps with the cover facing portion of each power transmission coil in the stacking direction. Is provided with a recessed portion on the power transmission coil side.

Heat can be transferred from the power transmission coil to the cover by forming an uneven shape on the inner surface of the cover so as to abut the cover facing portion of each power transmission coil. Then, on the outer surface of the cover, a recess recessed on the power transmission coil side is provided at a position overlapping the cover facing portion of each power transmission coil in the stacking direction. As a result, the thickness dimension of the cover at the position overlapping the cover facing portion of each power transmission coil can be reduced, and the heat of the power transmission coil can be easily released from the cover to the outside.

Circuit diagram showing the electrical configuration of a contactless power supply system Perspective view of the power receiving coil in the first embodiment Perspective view of the power receiving coil with the cover removed Bottom view with the cover removed Sectional view at VV position in FIG. Sectional view at the VI-VI position in FIG. Sectional view at position VII-VII in FIG. Sectional view at position VIII-VIII in FIG. Bottom view with cores lined up on the cooling surface Bottom view with the core fixed with a holder FIG. 6 at the XI position Bottom view of the holder Side view of the holder Side view of the holder Bottom view with the core placed in the comparative example The figure which shows the coupling coefficient of the comparative example and this embodiment The figure which shows the relationship between the protrusion height and the bolt loss ratio with respect to the core height. Bottom view with the cover removed in the comparative example Sectional drawing at IXX-IXX position in FIG. The figure which shows the maximum temperature of the coil of a comparative example and this embodiment Bottom view with the cover attached in the first embodiment Sectional view at position XXII-XXII in FIG. Cross-sectional view with the cover attached in the comparative example The figure which shows the maximum temperature of the coil of a comparative example and this embodiment Bottom view of the second embodiment with the cover removed Sectional view at position XXVI-XXVI in FIG. 25 Perspective view with cover attached Bottom view with cover attached FIG. 28 is a cross-sectional view taken along the line at the IXXX-IXXX position. Side view of the resin holder in another embodiment

<First Embodiment>
The non-contact power supply system 10 in the present embodiment includes a power transmission device 20 that non-contactly transmits the electric power supplied from the commercial power source 11 and a power receiving device 30 that non-contactly transmits the electric power from the power transmission device 20. The power transmission device 20 is buried in the ground such as a road on which a vehicle travels (expressway or the like), a parking space for parking, or the like. The power receiving device 30 is mounted on a vehicle such as an electric vehicle or a hybrid vehicle, and charges the vehicle-mounted battery 12 by outputting power to the vehicle-mounted battery 12 as a storage battery.

FIG. 1 shows the electrical configuration of the non-contact power supply system 10 in the present embodiment. A commercial power source 11 is connected to the power transmission device 20 of the non-contact power supply system 10, and is configured to input AC power supplied from the commercial power source 11 to the power transmission device 20. On the other hand, an in-vehicle battery 12 is connected to the power receiving device 30 of the non-contact power feeding system 10, and the power receiving device 30 outputs electric power to the in-vehicle battery 12 so that charging is performed. The power transmission device 20 has a plurality of single-phase coils arranged in parallel, while the power receiving device 30 has three-phase (U-phase, V-phase, W-phase) coils.

First, the power transmission device 20 will be described. The transmission device 20 includes an AC-DC converter 21 connected to a commercial power source 11, an inverter circuit 22 connected to the AC-DC converter 21, a transmission filter circuit 23 connected to the inverter circuit 22, and a transmission filter circuit 23. A transmission resonance circuit 24 connected to the above is provided. A plurality (two in this embodiment) of the inverter circuit 22, the power transmission filter circuit 23, and the power transmission resonance circuit 24 are provided and are connected in parallel to the AC-DC converter 21.

The AC-DC converter 21 converts the AC power supplied from the commercial power source 11 into DC power and supplies it to the inverter circuit 22. When viewed from the inverter circuit 22, the AC-DC converter 21 corresponds to a DC power supply.

The inverter circuit 22 converts the DC power supplied from the AC-DC converter 21 into AC power having a predetermined frequency (for example, 85 kHz). A single-phase inverter is used as the inverter circuit 22. The inverter circuit 22 is composed of a full bridge circuit having upper and lower arms. The current in each phase is adjusted by turning on / off the switching element provided in each arm.

The power transmission filter circuit 23 is a low-pass filter circuit that removes high-frequency components from AC power input from the inverter circuit 22. In the power transmission filter circuit 23, the coil, the capacitor, and the coil are connected in a T shape, and act as an imittance filter.

The power transmission resonance circuit 24 is a circuit that outputs AC power input from the power transmission filter circuit 23 to the power receiving device 30. The transmission resonance circuit 24 is a transmission side resonance portion 24a, 24b in which a transmission side capacitor 25 and a transmission coil 26 are connected in series.

The power receiving device 30 includes a power receiving resonance circuit 31 to which power is supplied from the power transmitting resonance circuit 24, a power receiving filter circuit 32 connected to the power receiving resonance circuit 31, a rectifier circuit 33 connected to the power receiving filter circuit 32, and a rectifier circuit. A DC-DC converter 34 connected to 33 is provided.

The power receiving resonance circuit 31 is a circuit that inputs power from the power transmission resonance circuit 24 in a non-contact manner and outputs it to the power receiving filter circuit 32. The power receiving resonance circuit 31 is configured so that it can resonate with the power transmission resonance circuit 24 in a magnetic field. Specifically, the power receiving resonance circuit 31 includes power receiving side resonance portions 31a, 31b, 31c in which the power receiving side capacitors 35u, 35v, 35w and the power receiving coils 36u, 36v, 36w are connected in series in each phase. ing. The resonance frequencies of the power receiving resonance circuit 31 and the power transmission resonance circuit 24 are set to be the same.

The power receiving filter circuit 32 is a low-pass filter circuit that removes high frequency components from the AC power input from the power receiving resonance circuit 31. In the power receiving filter circuit 32, the coil, the capacitor, and the coil are connected in a T shape, and act as an imittance filter. The power receiving filter circuit 32 is provided in each phase, and one end of the capacitor of each phase (the end on the side not connected to the coil) is connected at the connection point N1.

The rectifier circuit 33 is a circuit that full-wave rectifies AC power. In the present embodiment, a full-wave rectifier circuit composed of a diode bridge is adopted as the rectifier circuit 33, but a synchronous rectifier circuit composed of six switching elements (for example, MOSFET) may be used.

The DC-DC converter 34 transforms the DC power input from the rectifier circuit 33 and outputs it to the in-vehicle battery 12. The in-vehicle battery 12 charges the DC power input from the DC-DC converter 34.

Further, the power transmission device 20 is provided with a power transmission control unit 27 that controls the power transmission device 20, and the power reception device 30 is provided with a power reception control unit 37 that controls the power reception device 30. The power transmission control unit 27 controls the AC-DC converter 21, the inverter circuit 22, and the like. The power receiving control unit 37 controls the DC-DC converter 34 and the like. Further, the vehicle is provided with an ECU 13 (Electronic Control Unit), which gives an instruction to the power receiving control unit 37 to perform non-contact power supply while the vehicle is running to charge the in-vehicle battery 12.

According to the above configuration, when the AC power is input to the power transmission resonance circuit 24 in a situation where the relative positions of the power transmission device 20 and the power reception device 30 are in a position where magnetic resonance is possible, the power transmission coil 26 and the power reception coil 36 Resonates in the magnetic field. As a result, the power receiving device 30 receives a part of energy from the power transmitting device 20. That is, it receives AC power. In this embodiment, for convenience of explanation, it is assumed that the relative positions of the power transmitting device 20 and the power receiving device 30 are in positions where magnetic field resonance is possible.

Next, with reference to FIGS. 2 and 3, a housing H that accommodates the power receiving coils 36u, 36v, 36w and the power receiving coils 36u, 36v, 36w and attaches them to the vehicle will be described. The housing H accommodates the power receiving coils 36u, 36v, 36w so that their planes are parallel to the ground, cools the power receiving coils 36u, 36v, 36w, and has a cooling unit 40 having a mounting structure on the vehicle. It is composed of a cover 50 that covers the power receiving coils 36u, 36v, 36w. In the following description, the front-rear direction of the vehicle (the direction in which the arrows F and B in the figure extend) is the front-rear direction, the upper part of the vehicle (the direction in which the arrow T in the figure extends) is the upper direction, and the lower part of the vehicle (in the figure) The direction in which the arrow D extends) is the downward direction, and the direction orthogonal to the front-back direction and the vertical direction (the direction in which the arrows L and F in the figure extend) is the left-right direction.

As shown in FIGS. 3 and 4, a cooling unit 40 for cooling the power receiving coils 36u, 36v, 36w is provided. The cooling unit 40 has a cooling main body unit 42 having a cooling surface 41. The cooling main body 42 is a flat plate-shaped member made of aluminum. The cooling surface 41 is a surface of the cooling main body 42 on the power receiving coils 36u, 36v, 36w side, and is a surface opposite to the surface on the vehicle mounting side. A core 60 is arranged on the cooling surface 41, and a plurality of power receiving coils 36u, 36v, 36w are laminated and arranged below the core 60 (ground side). The core 60 and the power receiving coils 36u, 36v, 36w will be described later.

The cooling main body 42 serves as a shield member provided between the power receiving coils 36u, 36v, 36w and the bottom surface of the vehicle. Therefore, the cooling main body portion 42 has a thickness sufficient to serve as a shield member, and is a single plate having an area covering all the power receiving coils 36u, 36v, 36w.

As shown in FIGS. 2 and 3, on the vehicle-side surface of the cooling main body 42, the mounting portion 43 for mounting the housing H accommodating the power receiving coils 36u, 36v, 36w on the bottom surface (mounting surface) of the vehicle. Is provided. The mounting portions 43 are provided at both ends of the cooling main body portion 42 in the width direction, and are plate-shaped members extending in the front-rear direction. By providing the mounting portion 43, a predetermined space is formed between the mounting portion 43 and the bottom surface of the vehicle. As a result, the cooling main body 42 can be air-cooled by the traveling wind of the vehicle. Further, in the space between the cooling main body 42 formed by the mounting portion 43 and the bottom surface of the vehicle, thin plate-shaped fins 44 are provided so as to project from the cooling main body 42 toward the vehicle, and the cooling main body is provided. Promotes heat dissipation from the unit 42.

As shown in FIG. 3, on the cooling surface 41 of the cooling main body 42, a pedestal 45 for fixing the power receiving coils 36u, 36v, 36w on the cooling surface 41 is provided integrally with the cooling main body 42. .. The pedestal portions 45 are provided at both ends of the cooling surface 41 in the width direction, and are formed so as to extend in the front-rear direction. The pedestal portion 45 is provided with screw holes for fixing the power receiving coils 36u, 36v, 36w with screws. Further, the pedestal portion 45 is provided with a notch for pulling out the end portions of the lead wires of the power receiving coils 36u, 36v, 36w to the outside. The pedestal portion 45 may be provided by fixing a member separate from the cooling main body portion 42 to the cooling main body portion 42.

Next, the core 60 serving as the iron core of the power receiving coils 36u, 36v, 36w and the holder 70 for holding the core 60 will be described. As shown in FIG. 9, the cores 60 are arranged on the cooling surface 41 in the cooling main body 42. The core 60 is made of ferrite and acts as an iron core of the power receiving coils 36u, 36v, 36w. The core 60 is a rectangular parallelepiped long in the front-rear direction and short in the width direction (horizontal direction), and a plurality of cores 60 are arranged in a row on the cooling surface 41. The plurality of cores 60 are arranged in rows without gaps in the front-rear direction, while gaps S extending in the front-rear direction at predetermined intervals are provided between the rows extending in the front-rear direction of the cores 60. Therefore, the cores 60 are arranged in a plurality of rows with gaps S at predetermined intervals provided on the cooling surface 41 between the pedestals 45.

Then, as shown in FIGS. 10 and 11, each core 60 is fixed on the cooling surface 41 by the holder 70. The holder 70 is made of resin, and as shown in FIGS. 12 to 14, the core holding portion 71, the first fixing portion 72 provided so as to project from one side of the core holding portion 71, and the core holding portion It has a second fixing portion 73 provided so as to project from the other side of the 71. The core holding portion 71 is a flat plate-shaped member having the same width dimension as the width dimension of the core 60 and having a front-rear direction dimension slightly smaller than the front-rear direction dimension of the core 60, and cools the core 60. It is provided on the lower side of the core 60 (the side opposite to the cooling surface 41) so as to be sandwiched between the core 41 and the core holding portion 71.

As shown in FIGS. 10 and 12, the first fixing portion 72 is provided on one side of the core holding portion 71 on the gap S side, and is provided so as to project outward from the core holding portion 71 in the left-right direction. Specifically, the first fixing portions 72 are provided at both ends in the front-rear direction on one side of the gap S side (left-right direction side). Further, the second fixing portion 73 is provided on another side opposite to the first fixing portion 72 in the left-right direction so as to project outward from the core holding portion 71 in the left-right direction. The second fixing portion 73 is specifically provided at the center position of the core holding portion 71 in the front-rear direction so as not to overlap with the first fixing portion 72 in the front-rear direction. That is, the first fixed portion 72 and the second fixed portion 73 are displaced from each of the fixed portions 72, 73 of the holders 70 adjacent to each other in the left-right direction in the direction in which the gap S extends (front-back direction). As a result, the fixing portions 72, 73 of the adjacent holders 70 do not overlap with each other and are staggered. Therefore, the width direction dimension of the gap S required for fixing the holder 70 is set to one fixing portion 72, 73. It is possible to make only the width dimension of. In the present embodiment, the width direction of the gap S is set to about the diameter of the metal bolt 80.

As shown in FIGS. 13 and 14, each of the fixing portions 72 and 73 has a substantially rectangular parallelepiped shape and has a height dimension that is the same as or slightly smaller than the height dimension of the core 60. The fixing portions 72 and 73 are provided with bolt holes 74 into which the head 81 of the metal bolt 80 can be inserted. A metal collar 75 is arranged inside each bolt hole 74. The collar 75 may be insert-molded in advance, or may be fixed to the bolt hole 74 later. The holder 70 fixes the core 60 on the cooling surface 41 by screwing the screw portion 82 of the metal bolt 80 into the screw holes provided in the collar 75 and the cooling main body portion 42.

Further, it is preferable that the heat transfer resin 76 having high heat transfer property is sandwiched between the core 60 and the cooling surface 41. By providing the heat transfer resin 76, it is possible to remove the air gap between the core 60 and the cooling surface 41 in a state of being fixed to the holder 70. Therefore, the heat generated by the core 60 can be appropriately transferred to the cooling surface 41 to dissipate heat from the core 60.

The metal bolt 80 is a bolt made of a soft magnetic material such as iron. Therefore, it is said that the protruding height Hb (protruding dimension downward from the cooling surface 41) of the metal bolt 80 in the fixed state is higher than the height Hc (height from the cooling surface 41) of the core 60. , A current flows through the metal bolt 80, and the loss during power transmission / reception becomes large. Therefore, the protruding height Hb of the metal bolt 80 is lower than the height Hc of the core 60. As a result, it is possible to suppress the flow of current through the metal bolt 80 and reduce the loss. In the case of a non-metal bolt, for example, a resin bolt, the protruding height Hb of the bolt may be higher than the height Hc of the core 60.

The difference between the present embodiment and the comparative example shown in FIG. 15 due to the change of the core configuration will be compared and examined. FIG. 15 is a bottom view of the comparative example in a state where the core 260 is arranged. In the comparative example, it is assumed that one core 260 is arranged over the entire space between the pedestals 45 of the cooling surface 41. In this case, it is fixed to the cooling main body 42 with a resin holder that covers the entire core 260.

During power transmission / reception, power transmission / reception is performed by resonance between the single-phase power transmission side resonance units 24a and 24b and the power reception side resonance units 31a, 31b and 31c. At this time, with respect to the magnetic coupling between the power transmission side coils 26a and 26b and the power reception coils 36u, 36v and 36w, there is a comparative example with the present embodiment in which a gap S is provided between the cores 60 and no gap. Compare with. FIG. 16 is a diagram showing coupling coefficients between the power transmitting side coils 26a and 26b and the power receiving coils 36u, 36v and 36w between the comparative example and the present embodiment. As shown in FIG. 16, in the present embodiment and the comparative example, the coupling coefficients between the power transmitting side coils 26a and 26b and the power receiving coils 36u, 36v and 36w are substantially the same. That is, even if the minimum gap S for fixing the holder 70 is provided, there is almost no decrease in the coupling coefficient, and it is possible to suppress a decrease in efficiency during power transmission / reception.

Next, the relationship between the protrusion height Hb of the metal bolt 80 and the loss ratio will be considered. FIG. 17 is a diagram showing the relationship between the protruding height Hb of the metal bolt 80 and the bolt loss ratio with respect to the height Hc of the core 60. Specifically, it shows the ratio of the bolt loss to the loss of the power receiving coils 36u, 36v, 36w at the time of power transmission / reception when the protruding height Hb of the metal bolt 80 is made variable with respect to the height Hc of the core 60. The loss of the power receiving coils 36u, 36v, 36w includes the loss of each of the power receiving coils 36u, 36v, 36w, the loss of the core 60, and the loss of the cooling main body 42. As shown in FIG. 17, when the protruding height Hb of the metal bolt 80 is lower than the height Hc of the core 60, even the iron-based (soft magnetic material) metal bolt 80 is 1% or less, which is almost negligible. , The rate of bolt loss can be reduced.

Next, the power receiving coils 36u, 36v, and 36w will be described with reference to FIGS. 3 and 4. The power receiving coils 36u, 36v, and 36w are rectangular flat coils, and are formed by winding a conducting wire (for example, a litz wire) covered with an insulating material in a plane with respect to the bobbin 38. Each of the power receiving coils 36u, 36v, 36w has a width portion 36a extending in the width direction (horizontal direction) orthogonal to the front-rear direction and a connecting portion 36b connecting the width portions 36a. The width portion 36a extending in the direction intersecting the traveling direction (front-rear direction) of the vehicle is an effective region that contributes to power supply during traveling, while the connecting portion 36b extending in the traveling direction of the vehicle serves as power supply during traveling. It is a part that does not contribute much. Further, the shapes and the number of turns of the power receiving coils 36u, 36v, 36w are the same.

Further, the conducting wire covered with the insulating coating of the power receiving coils 36u, 36v, 36w is positioned by being wound along a groove formed in the resin bobbin 38 which is an insulating material. The bobbin 38 is used for each of the power receiving coils 36u, 36v, 36w, and is formed by providing a groove in a square annular flat plate having a rectangular hole formed in a rectangular central portion. Fixing pieces 38a for fixing the power receiving coils 36u, 36v, 36w to the pedestal portion 45 are provided at both ends of the bobbin 38 in the width direction, and screws are screwed into the screw holes provided in the fixing piece 38a. By doing so, the power receiving coils 36u, 36v, 36w are fixed to the pedestal portion 45.

It is preferable that the width of one side of the bobbin 38 is provided to the inside of the region where the conducting wire is wound. Since the width of one side of the bobbin 38 is larger than the area around which the conducting wire is wound, the bobbin 38 itself is less likely to bend. Further, the bobbin 38 may be used in combination with the bobbin 38 divided in half at the central position in the front-rear direction. When the bobbin 38 is large, it can be easily molded by dividing it.

The lead wires of the power receiving coils 36u, 36v, 36w are insulated by using an insulating film such as enamel, and the bobbin 38 insulates the lead wires from the cooling portion 40. That is, it is doubly insulated and suitable for use in the non-contact power supply system 10 that transmits and receives a large amount of electric power. It is desirable that the insulating coating and the insulating member such as the bobbin 38 are thin enough not to hinder the heat transfer from the conducting wires of the power receiving coils 36u, 36v, 36w to the pedestal portion 45.

The power receiving coils 36u, 36v, and 36w are stacked in the vertical direction so that their planes overlap. 3 and 5 will be used to describe how the power receiving coils 36u, 36v, and 36w are laminated. The U-phase power receiving coil 36u is arranged at a position (top) closest to the cooling surface 41 in the stacking direction. The V-phase power receiving coil 36v is arranged at an intermediate position in the stacking direction. The W-phase power receiving coil 36w is arranged at the position farthest (lowermost) from the cooling surface 41 in the stacking direction. The V-phase power receiving coil 36v may be arranged at the position farthest from the cooling surface 41 in the stacking direction, and the W-phase power receiving coil 36w may be arranged at an intermediate position in the stacking direction.

The power receiving coils 36u, 36v, 36w stacked in this way are arranged so as to be offset in a direction orthogonal to the stacking direction, specifically, in the front-rear direction. At that time, the regions surrounded by the power receiving coils 36u, 36v, 36w are arranged so as to partially overlap each other with respect to the regions surrounded by the other power receiving coils 36u, 36v, 36w. Specifically, the power receiving coils 36u, 36v, 36w are arranged so as to be displaced at equal intervals in the front-rear direction. More specifically, they are arranged with an electrical angle offset by 120 °. In the present embodiment, the U-phase power receiving coil 36u, which is between the other two in terms of electric angle, is arranged in the center in the front-rear direction, and the V-phase and W-phase power receiving coils 36v and 36w receive U-phase power. It is arranged on both sides of the coil 36u in the front-rear direction.

Then, by arranging them so as to be shifted in the front-rear direction, as shown in FIGS. 4 and 5, each of the power receiving coils 36u, 36v, 36w is cooled without interposing another power receiving coil 36u, 36v, 36w. Opposing portions 36c facing the surface 41 are provided respectively. That is, all the portions of the U-phase power receiving coil 36u located at the position closest to the cooling surface 41 in the stacking direction are facing portions 36c. The V-phase power receiving coil 36v located at an intermediate position in the stacking direction is arranged outside (front side) of the power receiving coil 36u in the front-rear direction of all of its width portion 36a and its connecting portion 36b. The portion is opposed to the portion 36c. The W-phase power receiving coil 36w located at the position farthest from the cooling surface 41 in the stacking direction is outside (rear side) of the power receiving coil 36u in the front-rear direction of all of its width portion 36a and its connecting portion 36b. ) Is opposed to the portion 36c.

Since the power receiving coils 36u, 36v, 36w are laminated, the distances of the opposing portions 36c of the power receiving coils 36u, 36v, 36w from the cooling surface 41 are different from each other. As a matter of course, even in the connecting portion 36b fixed to the pedestal portion 45, the distance from the cooling surface 41 of the facing portion 36c is different for each of the power receiving coils 36u, 36v, 36w. Therefore, if a pedestal portion having the same height dimension from the cooling surface 41 is used according to the distance between the power receiving coil 36u closest to the cooling surface 41 and the cooling surface 41, the power receiving coils 36v and 36w face each other. A gap is formed between the portion 36c and the pedestal portion, and the heat of the power receiving coils 36v and 36w is not directly transferred to the pedestal portion.

Therefore, in the present embodiment, the pedestal portion 45 is formed in the connecting portion 36b so as to have an uneven shape that fills the space between the facing portions 36c of the power receiving coils 36u, 36v, 36w and the cooling surface 41. That is, the pedestal portion 45 has a first convex portion 45a and a second convex portion having different protrusion dimensions from the cooling surface 41 according to the distance from the facing portions 36c of the power receiving coils 36u, 36v, 36w to the cooling surface 41. A portion 45b and a third convex portion 45c are provided.

More specifically, as shown in FIGS. 5 and 7, a first convex portion 45a is provided at a portion of the pedestal portion 45 that overlaps (opposes) the facing portion 36c of the power receiving coil 36u closest to the cooling surface 41. It is provided. The first convex portion 45a is formed so as to project from the cooling surface 41 until it comes into contact with the facing portion 36c of the power receiving coil 36u so as to fill the space between the cooling surface 41 and the facing portion 36c of the power receiving coil 36u. .. The distance between the cooling surface 41 and the power receiving coil 36u is set in consideration of the size and arrangement of the core 60 and the like.

Similarly, as shown in FIGS. 5 and 8, a second convex portion 45b is provided at a portion of the pedestal portion 45 facing the facing portion 36c of the power receiving coil 36v second away from the cooling surface 41. ing. The second convex portion 45b is formed so as to project from the cooling surface 41 until it comes into contact with the facing portion 36c of the power receiving coil 36v so as to fill the space between the cooling surface 41 and the facing portion 36c. The second convex portion 45b is provided on the front side of the first convex portion 45a (that is, the power receiving coil 36u) in the front-rear direction, and is provided so as to have a height dimension larger than that of the first convex portion 45a. ing. Specifically, the second convex portion 45b is formed to be larger than the first convex portion 45a by the height dimension of the power receiving coil 36u.

Similarly, as shown in FIGS. 5 and 6, a third convex portion 45c is provided in the portion of the pedestal portion 45 facing the facing portion 36c of the power receiving coil 36w farthest from the cooling surface 41. .. The third convex portion 45c is formed so as to project from the cooling surface 41 until it comes into contact with the facing portion 36c of the power receiving coil 36w so as to fill the space between the cooling surface 41 and the facing portion 36c. The third convex portion 45c is provided on the rear side of the first convex portion 45a (that is, the power receiving coil 36u) in the front-rear direction, and is provided so as to have a height dimension larger than that of the second convex portion 45b. ing. Specifically, the third convex portion 45c is formed to be larger than the second convex portion 45b by the height dimension of the power receiving coil 36v.

As described above, the pedestal having an uneven shape such that the first convex portion 45a to the third convex portion 45c fills the space between the facing portion 36c and the cooling surface 41 in the connecting portion 36b of the power receiving coils 36u, 36v, 36w. The unit 45 is configured.

Then, by abutting the pedestal portion 45 at the facing portion 36c of the connecting portions 36b of the power receiving coils 36u, 36v, 36w, heat is efficiently transferred to the pedestal portion 45 as compared with the case where a gap is provided. be able to. It is desirable that the width dimension of each connecting portion 36b of each of the power receiving coils 36u, 36v, 36w is smaller than the width dimension of the pedestal portion 45, and the entire surface is in contact with the pedestal portion 45 in the width direction of each connecting portion 36b.

In the present embodiment, the power receiving coils 36u, 36v, 36w are dissipated by the cooling main body 42 via the pedestal 45. At this time, as shown in FIGS. 3 to 5, a U-phase power receiving coil 36u located in the middle in the electric angle is arranged at the uppermost portion (cooling surface 41 side). The power receiving coil 36v is displaced to the front side of the power receiving coil 36u in the front-rear direction, and the power receiving coil 36w is displaced to the opposite side of the power receiving coil 36v, that is, to the rear side of the power receiving coil 36u.

As a result, the connecting portion 36b of the V-phase and W-phase power receiving coils 36v and 36w faces the portion that does not overlap the connecting portion 36b of the U-phase power receiving coil 36u, that is, the U-phase power receiving coil 36u does not intervene. The facing portion 36c will be provided. Therefore, the pedestal portion 45 is configured to have a concavo-convex shape so as to be in contact with the opposing portions 36c of the power receiving coils 36u, 36v, 36w. Therefore, heat is transferred from all the power receiving coils 36u, 36v, 36w to the cooling main body 42 via the pedestal 45.

In order to show the effectiveness of this embodiment, it will be described in comparison with the comparative examples shown in FIGS. 18 and 19. In the comparative example, among the power receiving coils 36u, 36v, 36w, the U-phase power receiving coil 36u, which is between the other two in terms of electric angle, is arranged at the position farthest from the cooling surface 41, that is, on the lowest side. There is. In such an arrangement, the pedestal portion 45 and the connecting portion 36b of the power receiving coil 36u can be contacted only with the other power receiving coils 36v and 36w interposed therebetween. That is, the U-phase power receiving coil 36u cannot be thermally connected to the pedestal portion 45, that is, the cooling main body portion 42.

Comparison of the present embodiment in which all the power receiving coils 36u, 36v, 36w are in contact with the pedestal portion 45 and some of the power receiving coils 36u, 36v, 36w cannot transfer heat to the pedestal portion 45 with respect to the temperatures of the power receiving coils 36u, 36v, 36w. Compare with the example. FIG. 20 is a diagram showing the maximum temperatures of the power receiving coils 36u, 36v, 36w of the comparative example and the present embodiment. The maximum temperature of the power receiving coils 36u, 36v, 36w indicates the highest temperature among the temperatures of the power receiving coils 36u, 36v, 36w. As shown in FIG. 20, the temperatures of the power receiving coils 36u, 36v, 36w of the present embodiment are lower than those of the power receiving coils 36u, 36v, 36w of the comparative example. Therefore, the wire diameters of the power receiving coils 36u, 36v, 36w can be reduced, and the power receiving coils 36u, 36v, 36w can be miniaturized.

Further, as shown in FIGS. 4 and 22, each of the power receiving coils 36u, 36v, 36w is provided with a cover facing portion 36d facing the cover 50 without interposing another power receiving coil. The W-phase power receiving coil 36w located at the position closest to the cover 50 in the stacking direction has all the parts facing the cover 36d. In the V-phase power receiving coil 36v located at the intermediate position in the stacking direction, the entire width portion 36a and the portion arranged in front of the power receiving coil 36w in the front-rear direction are on the cover facing portion 36d. It has become.

The U-phase power receiving coil 36u located at the position farthest from the cover 50 in the stacking direction has all the width portions 36a of the cover facing portion 36d. The connecting portion 36b of the U-phase power receiving coil 36u is entirely covered with the V-phase and W-phase power receiving coils 36v and 36w, and does not have a cover facing portion.

Next, the cover 50 will be described. As shown in FIGS. 2, 21 and 22, a resin cover 50 is provided to cover the power receiving coils 36u, 36v, 36w which are laminated and fixed in the vertical direction. The cover 50 is arranged on the ground side (lower side) of the power receiving coils 36u, 36v, 36w, and is made of a material that does not interfere with magnetic resonance with the power transmission device 20. The cover 50 has a substantially rectangular shape when viewed from the bottom surface, and a side wall projecting toward the cooling main body 42 side is provided on the outer peripheral edge portion thereof so as to surround the cover 50. This side wall is screwed to the cooling main body 42.

The shape of the cover 50 will be described. As shown in FIG. 2, the cover 50 is provided with an uneven shape. More specifically, the cover 50 has a first cover portion 51w located on the groundmost side, and a second cover portion 51v recessed on the cooling surface 41 side of the first cover portion 51w in the vertical direction.

The first cover portion 51w is provided in a square plate shape so as to cover the entire area of the power receiving coil 36w located on the groundmost side, that is, the cover facing portion 36d of the power receiving coil 36w.

On the other hand, the second cover portion 51v is provided on the front side of the first cover portion 51w in the front-rear direction, and is provided in a square plate shape. Specifically, the second cover portion 51v is provided so as to cover the front side of the power receiving coil 36w in the front-rear direction, that is, the cover facing portion 36d of the power receiving coil 36v.

In the vertical direction, the thickness dimension of the first cover portion 51w and the thickness dimension of the second cover portion 51v are provided so as to be substantially the same. Therefore, the first cover portion 51w and the second cover portion 51v are provided in a stepped shape, and the second cover portion 51v is only thicker than the first cover portion 51w by the power receiving coil 36w. It will be dented on the cooling surface 41 side (upper side). The first cover portion 51w and the second cover portion 51v provide a stepped (stepped) recess 52 on the outer surface 50b of the cover 50.

Further, as shown in FIGS. 2, 21 and 22, a first recessed portion 53 recessed on the upper side (cooling surface 41 side) is provided on the inner portion of the first cover portion 51w. The first recessed portion 53 is provided in a portion where the power receiving coil 36w is not provided. That is, the first recessed portion 53 is provided inside the power receiving coil 36w provided in an annular shape.

The bottom portion of the first recessed portion 53 is provided so as to abut the cover facing portion 36d of each of the power receiving coils 36v and 36w. The cover facing portion 36d of the power receiving coils 36v, 36w that abuts on the bottom of the first recessed portion 53 is a width portion 36a of the power receiving coils 36v, 36w on the rear side in the front-rear direction.

Then, in the vertical direction, the thickness dimension of the bottom portion of the first recess portion 53 is abbreviated as the thickness dimension of the other cover 50 (that is, the thickness dimension of the first cover portion 51w, the second cover portion 51v, etc.). It is the same. On the other hand, in the vertical direction, the positions of the cover facing portions 36d of the power receiving coils 36v and 36w are different. Therefore, a step is provided on the bottom portion in accordance with the position of the cover facing portion 36d of the power receiving coils 36v and 36w. That is, in the bottom portion, the front side in the front-rear direction has a first bottom portion 53a that covers the cover facing portion 36d of the power receiving coil 36v, and the rear side has a second bottom portion 53b that covers the cover facing portion 36d of the power receiving coil 36u. Have. The second bottom portion 53b is located above the first bottom portion 53a (on the cooling surface 41 side).

In the vertical direction, the depth dimension from the first cover portion 51w to the first bottom portion 53a is substantially the same as the thickness dimension of the power receiving coil 36w. Therefore, in the vertical direction, the first bottom portion 53a and the second cover portion 51v are arranged at substantially the same position. Further, in the vertical direction, the depth dimension from the first cover portion 51w to the second bottom portion 53b is substantially the same as the total of the thickness dimension of the power receiving coil 36w and the thickness dimension of the power receiving coil 36v.

Further, as shown in FIGS. 2, 21 and 22, a second recessed portion 54 recessed on the upper side (cooling surface 41 side) is provided on the inner portion of the second cover portion 51v. The second recessed portion 54 is provided in a portion where the power receiving coil 36v is not provided. That is, the second recess 54 is provided inside the power receiving coil 36v provided in an annular shape. At that time, the second recessed portion 54 is provided so as to overlap at least the cover facing portion 36d of the power receiving coil 36u.

The second recessed portion 54 is provided so as to be recessed toward the cooling surface 41 so that the bottom portion thereof abuts on the cover facing portion 36d of the power receiving coil 36u. In the vertical direction, the thickness dimension of the bottom portion of the second recess portion 54 is substantially the same as the thickness dimension of the other cover 50 (that is, the thickness dimension of the first cover portion 51w, the second cover portion 51v, etc.). It has become. Therefore, the depth dimension of the second recessed portion 54 (the dimension from the second cover portion 51v to the bottom portion) is substantially the same as the thickness dimension of the power receiving coil 36v. In the vertical direction, the bottom portion of the second recessed portion 54 and the second bottom portion 53b of the first recessed portion 53 are at substantially the same position.

Therefore, the cover 50 is provided with a recessed recess 52 by the first recess 53 and the second recess 54.

As described above, the cover 50 has a second cover so as to be recessed upward (on the power receiving coil 36u, 36v, 36w side) at a position overlapping the cover facing portion 36d of each power receiving coil 36u, 36v in the stacking direction. A portion 51v, a first recess portion 53, and a second recess portion 54 are configured. As a result, the inner surface 50a of the cover 50 is provided with an uneven shape in accordance with the position of each cover facing portion 36d in the vertical direction (stacking direction). Therefore, the cover facing portions 36d of the power receiving coils 36u, 36v, and 36w come into contact with the inner surface 50a of the cover 50. Then, the cover facing portions 36d of the power receiving coils 36u, 36v, 36w come into contact with the inner surface 50a of the cover 50, so that the power receiving coils 36u, 36v, 36w are held on the cooling main body 42 side. Further, since the cover facing portion 36d of each power receiving coil 36u, 36v, 36w directly abuts on the inner surface 50a of the cover 50, heat is transmitted from the power receiving coils 36u, 36v, 36w to the cover 50 with higher heat transfer efficiency than through air. Can be heated.

Further, since the cover 50 is provided with the first cover portion 51w, the second cover portion 51v, the first recessed portion 53, and the second recessed portion 54, the outer surface 50b of the cover 50 is provided with each power receiving coil in the vertical direction. A recess 52 recessed upward is provided at a position facing the cover facing portion 36d of the 36u, 36v, 36w. Then, the depth dimension (recess dimension) from the first cover portion 51w to the second cover portion 51v, the depth dimension (recess dimension) from the first cover portion 51w to the first bottom portion 53a of the first recess portion 53, and the first The depth dimension (dent dimension) from the 1 cover portion 51w to the second bottom portion 53b of the first recess portion 53 and the depth dimension (dent dimension) from the first cover portion 51w to the bottom portion of the second recess portion 54 are The distances from the reference position R (the position of the first cover portion 51w that covers the power receiving coil 36w) to the cover facing portion 36d of the power receiving coils 36u and 36v are different. As a result, the thickness of the portion of each of the power receiving coils 36u, 36v, 36w that covers the cover facing portion 36d is uniform. Therefore, the thermal resistance from the power receiving coils 36u, 36v, 36w to the cover 50 can be made uniform, and heat can be appropriately dissipated from the cover 50 of the power receiving coils 36u, 36v, 36w.

In order to show the effectiveness of this embodiment, it is compared with the comparative example shown in FIG. FIG. 23 is a cross-sectional view at a position corresponding to FIG. 22 with the cover 250 attached in the comparative example. The power receiving coils 36u, 36v, and 36w come into contact with the inner surface of the cover 250 of the comparative example. On the other hand, the outer surface of the cover 250 of the comparative example is flat so as to cover the power receiving coil 36w located at the position farthest from the cooling main body 42. That is, the thickness of the cover 250 of the portion covering the cover facing portion 36d differs depending on the location.

Regarding the temperature of the power receiving coils 36u, 36v, 36w, the present embodiment in which the thickness of the cover 50 of the portion covering the cover facing portion 36d of each power receiving coil 36u, 36v, 36w is uniform, and the cover of the portion covering the cover facing portion 36d. Compare with a comparative example in which the thickness of 250 varies from place to place. FIG. 24 is a diagram showing the maximum temperatures of the power receiving coils 36u, 36v, 36w between the comparative example and the present embodiment. As shown in FIG. 24, the maximum temperature of the power receiving coils 36u, 36v, 36w of the present embodiment is lower than that of the power receiving coils 36u, 36v, 36w of the comparative example. Therefore, the wire diameters of the power receiving coils 36u, 36v, 36w can be reduced, and the power receiving coils 36u, 36v, 36w can be miniaturized.

According to the present embodiment described in detail above, the following excellent effects can be obtained.

When a plurality of power receiving coils 36u, 36v, 36w are laminated on the cooling surface 41, the power receiving coils 36v, 36w and the cooling surface are arranged on the side away from the cooling unit 40 (cooling surface 41) depending on the arrangement. Other power receiving coils 36u and 36v are arranged between the power receiving coils 36u and 36v, and the power receiving coils 36v and 36w arranged on the distant side may not come into contact with the cooling unit 40.

Therefore, in the present embodiment, the power receiving coils 36u, 36v, 36w are provided with facing portions 36c facing the cooling surface 41 of the cooling unit 40 without interposing other power receiving coils 36u, 36v, 36w, and facing each other. A pedestal portion 45 having an uneven shape was provided so as to fill the space between the portion 36c and the cooling surface 41. As a result, the power receiving coils 36u, 36v, 36w and the cooling unit 40 are in thermal contact with each other via the pedestal portion 45, and the power receiving coils 36u, 36v, 36w are cooled. Therefore, even the multi-phase power receiving coils 36u, 36v, 36w arranged in a laminated manner can be efficiently cooled by the cooling unit 40.

The separation distances from the facing portions 36c of the power receiving coils 36u, 36v, 36w to the cooling surface 41 of the cooling portion 40 are different, and the pedestal portions 45 have different protrusion dimensions according to the separation distances, respectively, 45a, 45b, 45c is provided. As a result, different separation distances can be filled by the convex portions 45a, 45b, 45c of the pedestal portion 45.

The width portion 36a of the power receiving coils 36u, 36v, 36w is an effective region that contributes to power supply during traveling, while the connecting portion 36b extending in the traveling direction of the vehicle is a portion that does not contribute so much to power supply. Therefore, by contacting the pedestal portion 45 with the connecting portion 36b, it is possible to efficiently transmit and receive power even while traveling, and to secure the necessary heat transfer property.

It is assumed that the U-phase power receiving coil 36u, which is located between the two coils in terms of electrical angle, is located farthest from the cooling surface 41 in the stacking direction when the three-phase coils are stacked by shifting them by a predetermined electrical angle. Since the connecting portion 36b overlaps with the other power receiving coils 36u, 36v, 36w, heat cannot be transferred to the cooling unit 40. Therefore, the U-phase power receiving coil 36u is arranged at a position closest to the cooling surface 41 in the stacking direction. As a result, the connecting portion 36b of the V-phase and W-phase power receiving coils 36v and 36w can also come into contact with the pedestal portion 45 without using another power receiving coil. Therefore, at the connecting portion 36b, the power receiving coils 36u, 36v, 36w of all phases can be brought into contact with the cooling portion 40 via the pedestal portion 45, and the necessary heat transfer property can be ensured.

By forming an uneven shape on the inner surface 50a of the cover 50 so as to abut the cover facing portions 36d of the power receiving coils 36u, 36v, 36w, heat can be transferred from the power receiving coils 36u, 36v, 36w to the cover 50. it can. Then, on the outer surface 50b of the cover 50, recesses 52 recessed on the power receiving coils 36v, 36w side are provided at positions overlapping the cover facing portions 36d of the power receiving coils 36v, 36w in the stacking direction (vertical direction). As a result, the thickness dimension of the cover 50 at the position overlapping the cover facing portion 36d of each of the power receiving coils 36u, 36v, 36w can be reduced, and the heat of the power receiving coils 36u, 36v, 36w is released from the cover 50 to the outside. It will be easier to do.

The outer surface 50b of the cover 50 has a distance from the first cover portion 51w to the cover facing portions 36d of the power receiving coils 36v and 36w when the first cover portion 51w is used as a reference (reference position R) in the stacking direction. Recesses 52 having different recess dimensions were formed accordingly. That is, the dent dimensions from the first cover portion 51v to the bottom of the second cover portion 51v, the first bottom portion 53a of the first recess portion 53, the second bottom portion 53b of the first recess portion 53, and the second recess portion 54 are obtained from the first cover portion 51w. It was set according to the distance of each of the power receiving coils 36v and 36w to the cover facing portion 36d. As a result, the place where the distance from the first cover portion 51w to the cover facing portion 36d is large, that is, the thick part of the cover 50 can be thinned, and the variation in heat dissipation of the power receiving coils 36u, 36v, 36w can be suppressed. Can be done.

The thickness of the position covering the power receiving coils 36u, 36v, 36w of the cover 50 is made uniform. As a result, the thermal resistance of the cover 50 at the position where the power receiving coils 36u, 36v, 36w are covered and heat is received can be made uniform. Therefore, the variation in heat dissipation of each of the power receiving coils 36u, 36v, 36w can be further suppressed.

In the cover 50, the connecting portions 36b of the power receiving coils 36u, 36v, 36w are adjusted to the height fixed to the pedestal portion 45, and the portions overlapping the connecting portions 36b are the stepped first cover portions 51w and the first cover portion 51w. A recess 52 is formed by the two cover portions 51v. As a result, the portion of the cover 50 that overlaps with the connecting portion 36b of the power receiving coils 36u, 36v, 36w has a shape that matches the fixed height, and it is possible to prevent the cover 50 from becoming thick. Further, by stacking the power receiving coils 36u, 36v, 36w, the connecting portions 36b overlap each other, so that the width portion 36a of the power receiving coils 36u, 36v, 36w is located between the other power receiving coils 36u, 36v, 36w. There is. Therefore, in the portion of the cover 50 that overlaps with the cover facing portion 36d provided in the width portion 36a, the first bottom portion 53a of the first recessed portion 53, which is a recessed recessed portion 52 according to the position of the width portion 36a, The second bottom portion 53b of the 1 recessed portion 53 and the second recessed portion 54 are formed. As a result, the thickness of the cover 50 that covers the width portion 36a can be suppressed, and heat can be appropriately dissipated from the cover 50.

The core was not made into a single plate, but was made into an aggregate of a plurality of cores 60. Then, each of the finely configured cores 60 was fixed to the cooling main body 42 by the holder 70. As a result, it is possible to suppress an increase in the thickness dimension and strength of the member holding each core 60, and in the present embodiment, the holder 70.

The cores 60 are arranged in a plurality of rows, and the first fixing portion and the second fixing portion are arranged in the gap S formed between the rows of the core 60s. At this time, the fixed positions of the holders 70 are deviated from the fixed positions of the holders 70 in the adjacent rows along the direction in which the gap S extends (front-back direction), and are staggered. That is, the fixed positions of the adjacent holders 70 do not overlap and interfere with each other. Therefore, the size of the gap S can be set to one width of the fixed portion, and can be minimized.

First fixing portions 72 fixed to the cooling main body 42 are provided at both ends of one side of the core holding portion 71 on the gap side, and the other side facing one side, that is, the other side on the other gap S side. Is provided with a second fixing portion 73 fixed to the cooling main body portion 42. That is, since it is fixed at three places, the core 60 can be fixed without rattling. Further, since the second fixing portion 73 is provided between the first fixing portions 72 in the direction in which the gap S extends, the gap S can be reduced.

In order to secure a predetermined fastening force, a metal bolt, particularly a metal bolt 80 made of a soft magnetic material such as iron, may be used. When a metal bolt 80 made of a soft magnetic material such as iron is used, if the protrusion height Hb of the metal bolt 80 from the cooling main body 42 is higher than the height Hc of the core 60, a current flows through the metal bolt 80. , The loss in power transmission and reception becomes large. Therefore, the protruding height Hb of the metal bolt 80 is lower than the height Hc of the core 60. As a result, it is possible to suppress the flow of current through the metal bolt 80 and reduce the loss of power transmission / reception.

<Second Embodiment>
In the second embodiment, the U-phase power receiving coil 36u located in the middle in the electric angle is arranged in the middle position in the stacking direction. For the same configuration as that of the first embodiment, the same reference numerals as those of the first embodiment are used, and the description thereof will be omitted.

As shown in FIGS. 25 and 26, a pedestal portion 145 for fixing the power receiving coils 36u, 36v, 36w on the cooling surface 41 is provided integrally with the cooling main body 42 on the cooling surface 41 of the cooling main body 42. Has been done. First, how the power receiving coils 36u, 36v, 36w are laminated by the pedestal portion 145 will be described. The U-phase power receiving coil 36u is located at an intermediate position in the stacking direction. The V-phase power receiving coil 36v is located at the position closest to the cooling surface 41 in the stacking direction (top), and the W-phase power receiving coil 36w is located farthest from the cooling surface 41 in the stacking direction (bottom). Is located in. The V-phase power receiving coil 36v may be located at the position farthest from the cooling surface 41 in the stacking direction, and the W-phase power receiving coil 36w may be located at the position closest to the cooling surface 41 in the stacking direction. Further, as in the first embodiment, the power receiving coil 36u is arranged at the center in the front-rear direction. The power receiving coil 36v is displaced to the front side of the power receiving coil 36u in the front-rear direction, and the power receiving coil 36w is arranged to be displaced to the opposite side of the power receiving coil 36v, that is, to the rear side of the power receiving coil 36u. ..

Further, by arranging the power receiving coils 36u, 36v, 36w so as to be displaced in the front-rear direction, the facing portions 136c facing the cooling surface 41 are provided on the power receiving coils 36u, 36v, 36w without interposing other power receiving coils 36u, 36v, 36w, respectively. It will be provided. That is, all the portions of the V-phase power receiving coil 36v located at the position closest to the cooling surface 41 in the stacking direction are facing portions 136c. The U-phase power receiving coil 36u located at an intermediate position in the stacking direction is arranged outside (rear side) of the power receiving coil 36v in the front-rear direction of all of the width portion 36a and the connecting portion 36b thereof. The portion facing the portion is 136c. The W-phase power receiving coil 36w located at the position farthest from the cooling surface 41 in the stacking direction is outside (rear side) of all of the width portion 36a and the connecting portion 36b in the front-rear direction of the power receiving coil 36u. The portion arranged in is the facing portion 136c.

Then, in the connecting portion 36b, the pedestal portion 145 is formed so as to have an uneven shape so as to fill the space between the facing portions 36c of the power receiving coils 36u, 36v, 36w and the cooling surface 41. That is, the pedestal portion 145 has a first convex portion 145a, a second convex portion 145b, and a third convex portion having different protrusion dimensions according to the separation distance from the facing portions 36c of the power receiving coils 36u, 36v, 36w to the cooling surface 41. A convex portion 145c is provided.

Specifically, a first convex portion 145a is provided at a portion of the pedestal portion 145 that overlaps (opposes) the facing portion 36c of the power receiving coil 36v closest to the cooling surface 41. The first convex portion 145a is formed so as to project from the cooling surface 41 until it comes into contact with the facing portion 36c of the power receiving coil 36v so as to fill the space between the cooling surface 41 and the facing portion 36c of the power receiving coil 36v. .. The first convex portion 145a is provided on the most front side in the front-rear direction. The distance between the cooling surface 41 and the power receiving coil 36v is set in consideration of the size and arrangement of the core 60 and the like.

Similarly, in the pedestal portion 145, a second convex portion 145b is provided at a portion of the pedestal portion 145 facing the facing portion 36c of the power receiving coil 36u second away from the cooling surface 41. The second convex portion 145b is formed so as to project from the cooling surface 41 until it comes into contact with the facing portion 36c of the power receiving coil 36u so as to fill the space between the cooling surface 41 and the facing portion 36c. The second convex portion 145b is provided at an intermediate position on the rear side of the first convex portion 145a (that is, the power receiving coil 36v) in the front-rear direction, and has a height dimension larger than that of the first convex portion 145a. It is provided as follows. Specifically, the second convex portion 145b is formed to be larger than the first convex portion 145a by the height dimension of the power receiving coil 36v.

Similarly, in the pedestal portion 145, a third convex portion 145c is provided at a portion facing the facing portion 36c of the power receiving coil 36w farthest from the cooling surface 41. The third convex portion 145c is formed so as to project from the cooling surface 41 until it comes into contact with the facing portion 36c of the power receiving coil 36w so as to fill the space between the cooling surface 41 and the facing portion 36c. The third convex portion 45c is provided on the rear side of the second convex portion 145b (that is, the power receiving coil 36u) in the front-rear direction, and is provided so as to have a height dimension larger than that of the second convex portion 145b. ing. Specifically, the third convex portion 145c is formed to be larger than the second convex portion 145b by the height dimension of the power receiving coil 36u.

As described above, the pedestal has an uneven shape such that the first convex portion 145a to the third convex portion 145c fill the space between the facing portion 36c and the cooling surface 41 in the connecting portion 36b of the power receiving coils 36u, 36v, 36w. Part 145 is configured.

Also in this embodiment, the power receiving coils 36u, 36v, 36w are dissipated by the cooling main body 42 via the pedestal 145. At this time, the U-phase power receiving coil 36u located in the middle in the electric angle is arranged in the middle position. The power receiving coil 36v is displaced to the front side of the power receiving coil 36u in the front-rear direction, and the power receiving coil 36w is displaced to the opposite side of the power receiving coil 36v, that is, to the rear side of the power receiving coil 36u.

As a result, the connecting portion 36b of the U-phase and W-phase power receiving coils 36u and 36w faces the portion that does not overlap the connecting portion 36b of the V-phase power receiving coil 36v, that is, the V-phase power receiving coil 36v does not intervene. The facing portion 136c will be provided. Therefore, the pedestal portion 145 is configured to have an uneven shape so as to be in contact with the opposing portions 136c of the power receiving coils 36u, 36v, 36w. Therefore, heat is transferred from all the power receiving coils 36u, 36v, 36w to the cooling main body 42 via the pedestal 145.

In order to show the effectiveness of this embodiment, it will be described in comparison with the comparative examples shown in FIGS. 18 and 19. As shown in FIG. 20, the temperatures of the power receiving coils 36u, 36v, 36w of the present embodiment are lower than those of the power receiving coils 36u, 36v, 36w of the comparative example. Therefore, the wire diameters of the power receiving coils 36u, 36v, 36w can be reduced, and the power receiving coils 36u, 36v, 36w can be miniaturized. The first embodiment and the second embodiment have almost the same effect.

Further, as shown in FIGS. 26 and 28, each of the power receiving coils 36u, 36v, 36w is provided with a cover facing portion 136d facing the cover 150 without interposing another power receiving coil. The W-phase power receiving coil 36w, which is located closest to the cover 150 in the stacking direction, has all the parts facing the cover 136d. In the U-phase power receiving coil 36u located at the intermediate position in the stacking direction, the entire width portion 36a and the portion arranged in front of the power receiving coil 36w in the front-rear direction are located on the cover facing portion 136d. It has become. The V-phase power receiving coil 36v located at the position farthest from the cover 150 in the stacking direction covers all the width portions 36a and the portion arranged in the front-rear direction in front of the power receiving coil 36u. The facing portion is 136d.

Next, the cover 150 will be described with reference to FIGS. 27 to 29. The cover 150 is provided with an uneven shape. More specifically, the cover 150 has a first cover portion 151w located on the groundmost side, a second cover portion 151v recessed on the cooling surface 41 side of the first cover portion 151w in the vertical direction, and a third cover portion 151u. ..

The first cover portion 151w is provided in a square plate shape so as to cover the entire area of the power receiving coil 36w located on the groundmost side, that is, the cover facing portion 136d of the power receiving coil 36w.

The third cover portion 151u is provided on the front side of the first cover portion 151w in the front-rear direction, and is provided in a square plate shape. Specifically, the third cover portion 151u is provided so as to cover the front side of the power receiving coil 36w in the front-rear direction, that is, the cover facing portion 136d of the power receiving coil 36u.

The second cover portion 151v is provided on the front side of the third cover portion 151u in the front-rear direction, and is provided in a square plate shape. Specifically, the second cover portion 151v is provided so as to cover the front side of the power receiving coil 36u in the front-rear direction, that is, the cover facing portion 136d of the power receiving coil 36v.

In the vertical direction, the thickness dimension of the first cover portion 151w, the thickness dimension of the second cover portion 151v, and the thickness dimension of the third cover portion 151u are provided so as to be substantially the same. Therefore, the first cover portion 151w, the second cover portion 151v, and the third cover portion 151u are provided in a stepped shape. The third cover portion 151u is recessed toward the cooling surface 41 side (upper side) by the thickness dimension of the power receiving coil 36w as compared with the first cover portion 151w. The second cover portion 151v is recessed toward the cooling surface 41 side (upper side) by the thickness dimension of the power receiving coil 36u as compared with the third cover portion 151u. The first cover portion 151w, the second cover portion 151v, and the third cover portion 151u provide a stepped (stepped) recess 152 on the outer surface 150b of the cover 150.

Further, the inner portion of the first cover portion 151w is provided with a first recessed portion 153 that is recessed on the upper side (cooling surface 41 side). The first recessed portion 153 is provided in a portion where the power receiving coil 36w is not provided. That is, the first recessed portion 153 is provided inside the power receiving coil 36w provided in an annular shape.

The bottom portion of the first recessed portion 153 is provided so as to abut the cover facing portion 136d of each of the power receiving coils 36v and 36w. The cover facing portion 136d of the power receiving coils 36v, 36w that abuts on the bottom of the first recessed portion 153 is a width portion 36a of the power receiving coils 36v, 36w on the rear side in the front-rear direction.

Then, in the vertical direction, the thickness dimension of the bottom portion of the first recess portion 153 is the thickness dimension of the other cover 150 (that is, the first cover portion 151w, the second cover portion 151v, the third cover portion 151u, etc. It is almost the same as the thickness dimension of). On the other hand, in the vertical direction, the positions of the cover facing portions 136d of the power receiving coils 36v and 36w are different. Therefore, a step is provided on the bottom of the power receiving coils 36v and 36w in accordance with the position of the cover facing portion 136d. That is, in the bottom portion, the front side in the front-rear direction has a second bottom portion 153b that covers the cover facing portion 136d of the power receiving coil 36v, and the rear side has a first bottom portion 153a that covers the cover facing portion 136d of the power receiving coil 36u. Have. The second bottom portion 153b is located above the first bottom portion 153a (on the cooling surface 41 side).

In the vertical direction, the depth dimension from the first cover portion 151w to the first bottom portion 153a is substantially the same as the thickness dimension of the power receiving coil 36w. Therefore, in the vertical direction, the first bottom portion 153a and the third cover portion 151u are arranged at substantially the same position, and the second bottom portion 153b and the second cover portion 151v are arranged at substantially the same position. The Rukoto. Further, in the vertical direction, the depth dimension from the first cover portion 151w to the second bottom portion 153b is substantially the same as the sum of the thickness dimension of the power receiving coil 36w and the thickness dimension of the power receiving coil 36u.

Therefore, the cover 50 is provided with the recessed recess 152 by the first recessed portion 153.

As described above, the cover 150 has a second cover so as to be recessed upward (on the power receiving coil 36u, 36v, 36w side) at a position overlapping the cover facing portion 136d of each power receiving coil 36u, 36v in the stacking direction. A portion 151v, a third cover portion 151u, and a first recessed portion 153 are configured. As a result, the inner surface 150a of the cover 150 is provided with an uneven shape in accordance with the position of each cover facing portion 136d in the vertical direction (stacking direction). Therefore, the cover facing portions 136d of the power receiving coils 36u, 36v, and 36w come into contact with the inner surface 150a of the cover 150. Then, the cover facing portions 136d of the power receiving coils 36u, 36v, 36w come into contact with the inner surface 150a of the cover 150, so that the power receiving coils 36u, 36v, 36w are held on the cooling main body 42 side. Further, the cover facing portion 136d of each of the power receiving coils 36u, 36v, 36w directly contacts the inner surface 150a of the cover 150, so that the heat is transmitted from the power receiving coils 36u, 36v, 36w to the cover 150 with higher heat transfer efficiency than through air. Can be heated.

Further, since the cover 150 is provided with the first cover portion 151w, the second cover portion 151v, the third cover portion 151u, and the first recessed portion 153, the outer surface 150b of the cover 150 receives power in the vertical direction. A recess 152 recessed upward is provided at a position facing the cover facing portion 136d of the coils 36u, 36v, 36w. Then, from the first cover portion 151w to the second cover portion 151v (recessed dimension), the depth dimension from the first cover portion 151w to the third cover portion 151u (recessed dimension), and the first cover portion 151w. The depth dimension (recess dimension) of the first recess portion 153 to the first bottom portion 153a and the depth dimension (recess dimension) from the first cover portion 151w to the second bottom portion 153b of the first recess portion 153 are reference positions. The distances from R (the position of the first cover portion 151w that covers the power receiving coil 36w) to the cover facing portions 136d of the power receiving coils 36u and 36v, respectively, are different. As a result, the thickness of the portion of each of the power receiving coils 36u, 36v, 36w that covers the cover facing portion 136d is uniform. Therefore, the thermal resistance from the power receiving coils 36u, 36v, 36w to the cover 150 can be made uniform, and heat can be appropriately dissipated from the cover 150 of the power receiving coils 36u, 36v, 36w.

<Other embodiments>
The present invention is not limited to the above-described embodiment, and may be implemented as follows, for example. By the way, the configuration of the following alternative example may be applied individually to the configuration of the above embodiment, or may be applied in any combination.

-The power receiving coils 36u, 36v, 36w may have two phases or four or more phases instead of three phases.

-The cooling main body 42 may be cooled by water cooling. A well-known water cooling device may be provided between the cooling main body 42 and the vehicle, and the cooling main body 42 may be cooled by the water cooling device.

-As shown in FIG. 30, when the thickness of the core 60 is thin, that is, when the height Hc of the core 60 is low, it is preferable to use a low head bolt. By using a low head bolt, the protruding height Hb of the metal bolt 280 may be made lower than the height Hc of the core 60. Further, the protruding height Hb of the metal bolt 80 is made lower than the height Hc of the core 60 by providing a recess in which the fixing portions 72 and 73 abut each other or a groove for recessing the gap S portion in the cooling main body portion 42. It may be.

A pedestal portion may be provided that abuts on the width portions 36a of the power receiving coils 36u, 36v, 36w. Each bobbin 38 may be fixed to the pedestal portion by the opposing portions 36c, 136c provided in the width portions 36a of the power receiving coils 36u, 36v, 36w. In this case, the core 60 may be partially removed to provide the pedestal portion.

In addition to the pedestals provided at both ends of the cooling surface 41 in the width direction, the gap S of the core 60 on the cooling surface 41 is formed in the facing portions 36c, 136c of the width portions 36a of the power receiving coils 36u, 36v, 36w. A projecting portion may be provided that projects from the facing position toward the power receiving coils 36u, 36v, 36w and abuts and supports them. As a result, the protruding portion can receive heat while supporting the power receiving coils 36u, 36v, 36w from between the divided cores 60. Therefore, it is possible to increase the number of places that receive heat while securing the space for the core 60.

The pedestal portion may be configured such that a part of the bobbin projects toward the cooling surface 41 and fills the space between the facing portions 36c, 136c of the power receiving coils 36u, 36v, 36w and the cooling surface 41.

The recesses of the covers 50 and 150 may be provided in a part of the power receiving coils 36u, 36v and 36w that cover the cover facing portions 36d and 136d. At this time, it is desirable that the recessed dimension of the recess corresponds to the distance from the reference position R to the cover facing portions 36d and 136d of the power receiving coils 36u, 36v and 36w. As a result, it is possible to suppress variations in thermal resistance even if the thermal resistance is not uniform.

A plurality of cores 60 may be divided into a plurality of groups, and each group may be fixed to the cooling main body 42 with a holder. For example, two cores 60 may be grouped together in the left-right direction and fixed by a holder. Further, the cores 60 may be fixed together with a holder by two in the row direction (in the front-rear direction). If you divide into multiple groups and fix them with holders, you can reduce the number of fixing points.

The power transmission device 20 may have multiple phases (specifically, three phases) as in the power receiving device 30 of the first embodiment and the second embodiment. When the power transmission device 20 side has multiple phases, it is desirable to use the configuration of the power reception device 30 in the first embodiment and the second embodiment. In order to use the configuration of the power receiving device 30 in the power transmitting device 20, it is preferable to turn it upside down. Specifically, the covers 50 and 150 may be at the top, and the power transmission coil 26, the bobbin 38, the pedestal portions 45 and 145, the core 60, and the cooling surface 41 may be arranged in this order. At this time, the structure for cooling the cooling main body 42 may be air-cooled using a fan or water-cooled using a water cooling device.

When a plurality of power transmission coils 26 are stacked on the cooling surface 41, another power transmission coil 26 is placed between the power transmission coil 26 and the cooling surface 41 arranged on the side away from the cooling unit 40 due to the arrangement thereof. The power transmission coil 26 arranged and arranged on the distant side may not come into contact with the cooling unit 40.

Therefore, the power transmission coil 26 is provided with a facing portion facing the cooling surface 41 of the cooling unit 40 without interposing another power transmission coil 26, and a pedestal is provided so as to fill the space between each facing portion and the cooling unit 40. The portions 45 and 145 have an uneven shape. As a result, the power transmission coil 26 and the cooling unit 40 are in thermal contact with each other via the pedestals 45 and 145, and heat is transferred from the power transmission coil 26 to the cooling unit 40 via the pedestals 45 and 145. Therefore, even the multi-phase power transmission coils 26 arranged in a laminated manner can be efficiently cooled by the cooling unit 40.

The separation distance from the facing portion of each power transmission coil 26 to the cooling surface 41 of the cooling portion 40 is different, and the pedestal portions 45 and 145 have different protrusion dimensions according to the separation distance, respectively, the convex portions 45a, 45b, 45c and 145a. , 145b, 145c are provided. As a result, different separation distances can be maintained by the convex portions 45a, 45b, 45c, 145a, 145b, 145c of the pedestal portion 45, and the transmission coils 26 can be laminated.

The width portion of the power transmission coil 26 is an effective region that contributes to power supply, while the connecting portion that extends in the extending direction of the road is a portion that does not contribute much to power supply. Therefore, by contacting the pedestals 45, 45 at the connecting portion, it is possible to efficiently transmit and receive power even while traveling, and to secure the necessary heat transfer property.

When the three-phase coils are stacked by shifting them by a predetermined electric angle, the U-phase power transmission coil 26u located between the two coils in the electric angle is located at the position farthest from the cooling surface 41 in the stacking direction. Since the connecting portion overlaps with the other power transmission coil 26, heat cannot be transferred to the cooling unit 40. Therefore, the coil located between the two coils in terms of electric angle is arranged at the position closest to or intermediate with the cooling surface 41 in the stacking direction. As a result, the insulating portions of the coils of all phases can be thermally contacted with the cooling portion 40 via the pedestal portion 45 at the connecting portion, and the necessary heat transfer property can be ensured.

On the cooling surface, a core 60 divided in the surface direction is arranged. The power transmission coil 26 is in contact with a protruding portion between the divided cores 60 that protrudes from a position facing the facing portion of the power transmission coil 26. As a result, the protrusion can receive heat while supporting the power transmission coil 26 from between the divided cores 60. Therefore, it is possible to increase the number of places that receive heat while securing the space for the core 60.

10 ... non-contact power supply system, 20 ... power transmission equipment, 26 ... power transmission coil, 30 ... power reception equipment, 36 ... power reception coil, 40 ... cooling unit, 41 ... cooling surface, 45 ... pedestal unit.

Claims (8)

In the power receiving device (30) of the non-contact power feeding system (10) that supplies power in a non-contact manner between the power transmitting device (20) buried in the ground and the power receiving device (30) provided on the vehicle side. ,
A plurality of power receiving coils (36u, 36v, 36w) that are stacked and arranged at predetermined intervals in a direction orthogonal to the stacking direction, and
A housing (H) for accommodating the plurality of power receiving coils so that the plane thereof is parallel to the ground is provided.
The housing is attached to the vehicle, and is arranged on the ground side of the power receiving coil and the main body portion (42) on which the power receiving coil is attached on the side opposite to the mounting surface of the vehicle. With a cover (50,150) to cover
Each of the power receiving coils is provided with cover facing portions (36d, 136d) facing the inner surface of the cover without interposing another power receiving coil.
The inner surface of the cover is formed with an uneven shape so that the inner surface abuts on the cover facing portion of each power receiving coil.
A power receiving device having a recess (52, 152) recessed on the power receiving coil side at a position overlapping the cover facing portion of each power receiving coil in the stacking direction on the outer surface of the cover. In the stacking direction, when the position of the cover covering the power receiving coil arranged on the ground side is set as the reference position, the distance from the reference position to the cover facing portion of each power receiving coil is determined for each power receiving coil. Is different,
The power receiving device according to claim 1, wherein the outer surface is formed with the recess having a recess dimension different depending on the distance. The power receiving device according to claim 1 or 2, wherein the recess is formed so that the thickness of the position of the cover covering the power receiving coil is uniform. The power receiving coil is wound in a rectangular shape, and has a width portion (36a) extending in the width direction orthogonal to the front-rear direction of the vehicle and a connecting portion (36b) connecting the width portions (36a).
Each of the power receiving coils is fixed to the main body at different heights at the connecting portion.
On the outer surface of the cover, in the portion of the cover facing portion that overlaps with the connecting portion, the stepped recesses (51v, 151v, 151u) are formed according to the height of the connecting portion. Claims 1 to 3 in which the recess-shaped recesses (53, 54, 153) are formed in the portion of the cover facing portion that overlaps with the width portion, depending on the position of the width portion. The power receiving device according to any one of the above. In the power transmission device (20) of the non-contact power supply system (10) that supplies power in a non-contact manner between the power transmission device (20) buried in the road and the power receiving device (30) provided on the vehicle side. ,
A plurality of power transmission coils (26) that are stacked and arranged at predetermined intervals in a direction orthogonal to the stacking direction.
A housing (H) for accommodating the plurality of power transmission coils so that the plane thereof is parallel to the road is provided.
The housing is embedded in the road, and is arranged on the ground side of the power transmission coil and the main body portion (42) to which the power transmission coil is mounted on the side opposite to the mounting surface of the road. Has a cover (50,150) to cover the coil
Each of the power transmission coils is provided with a cover facing portion facing the inner surface of the cover without interposing another power transmission coil.
The inner surface of the cover is formed with an uneven shape so that the inner surface abuts on the cover facing portion of each power transmission coil.
A power transmission device in which a recess (52,152) recessed on the power transmission coil side is provided on the outer surface of the cover at a position overlapping the cover facing portion of each power transmission coil in the stacking direction. In the stacking direction, when the position of the cover covering the power transmission coil arranged on the vehicle side is set as the reference position, the distance from the reference position to the cover facing portion of each power transmission coil is the power transmission coil. It ’s different for each
The power transmission device according to claim 5, wherein the outer surface is formed with the recess having a different depth dimension according to the distance. The power transmission device according to claim 5 or 6, wherein the recess is formed so that the thickness of the position of the cover covering the power transmission coil is uniform. The power transmission coil is wound in a rectangular shape, and has a width portion extending in a width direction orthogonal to the extending direction of the road and a connecting portion connecting the width portions.
Each of the power transmission coils is fixed to the main body at different heights at the connecting portion.
On the outer surface of the cover, in the portion of the cover facing portion that overlaps with the connecting portion, the stepped recesses (51v, 151v, 151u) are formed according to the height of the connecting portion. 5. Claims 5 to 7 in which the recessed recesses (53, 54, 153) are formed in the portion of the cover facing portion that overlaps with the width portion, depending on the position of the width portion. The power transmission equipment according to any one of the above.