JP7324083B2 - Receiving equipment and transmitting equipment - Google Patents

Description

The present invention relates to a power transmitting device and a power receiving device that transmit and receive AC power in a contactless manner between a power transmitting device buried in a road and a power receiving device attached to a vehicle.

2. Description of the Related Art Conventionally, when charging an electric vehicle or the like, a system using magnetic resonance or electromagnetic induction is known as a contactless power supply system that supplies power to a counterpart in a contactless manner without using a power cord or a power transmission cable. In order to charge an electric vehicle or the like, it is necessary to transmit and receive a large amount of power, which tends to result in a large loss, that is, a large amount of heat. Therefore, in some cases, the power receiving device is provided with a cooling device. For example, the cooling device disclosed in Patent Document 1 is provided outside the housing of the power receiving device, and heat is transferred from the housing. Further, the cooling device is provided with a flow path for flowing water therein, and the heat transferred from the housing is released to the water, thereby cooling the power receiving device.

JP 2018-93589 A

By the way, when transmitting and receiving AC power in a non-contact manner, coils may be multi-phased in order to suppress power pulsation. In order to save space, multiphase coils are sometimes stacked. However, conventionally, no study has been made on a structure for cooling laminated coils. Therefore, when the multi-phase coils are stacked, even if the coil arranged on the side of the cooling device can be cooled so as to be in contact with the cooling device, other coils away from the cooling device should be brought into contact with the cooling device. can't

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 layers.

A first means is a power receiving device of a contactless power supply system that performs contactless power supply between a power transmitting device buried in the ground and a power receiving device provided on the vehicle side, in which a plurality of power receiving coils and a cooling unit that cools the power receiving coil by having a cooling surface to which heat is transferred from the power receiving coil; a pedestal portion fixed on the cooling surface, wherein the plurality of power receiving coils are stacked on the cooling surface and arranged at predetermined intervals in an orthogonal direction orthogonal to the stacking direction, thereby Each power receiving coil is provided with a facing portion that faces the cooling surface of the cooling unit without interposing another power receiving coil. It is to have an uneven shape so as to fill the space between the cooling surface of the part.

When a plurality of power receiving coils are stacked on the cooling surface, another power receiving coil is arranged between the power receiving coil arranged on the side away from the cooling unit and the cooling surface due to its arrangement, In some cases, the receiving coil arranged in the cooling unit does not contact the cooling unit. Therefore, in this means, the power receiving coil is provided with a facing portion that faces the cooling surface of the cooling portion without interposing another power receiving coil, and an uneven shape that fills the space between each facing portion and the cooling portion is formed. A pedestal is provided. As a result, the power receiving coil and the cooling unit are in contact with each other via the base, and heat is transferred from the power receiving coil to the cooling unit via the base. Therefore, even multi-phase receiving coils arranged in layers can be efficiently cooled by the cooling unit.

A second means is a power transmission device of a contactless power supply system that performs contactless power supply between a power transmission device buried in the road and a power receiving device provided on the vehicle side, in which a plurality of power transmission coils and a cooling unit that cools the power transmission coil by having a cooling surface to which heat is transferred from the power transmission coil; a pedestal portion fixed on the cooling surface, wherein the plurality of power transmission coils are stacked on the cooling surface and arranged with a predetermined interval in an orthogonal direction orthogonal to the stacking direction; Each power transmission coil is provided with a facing portion that faces the cooling surface of the cooling unit without interposing another power transmission coil, and the pedestal portion is provided with the facing portion of each power transmission coil and the cooling surface. It is to have an uneven shape so as to fill the space between the cooling surface of the part.

When a plurality of power transmission coils are stacked on the cooling surface, another power transmission coil is arranged between the cooling surface and the power transmission coil arranged on the side away from the cooling unit due to its arrangement, In some cases, the power transmission coil arranged in the Therefore, in this means, the power transmission coil is provided with a facing portion that faces the cooling surface of the cooling portion without interposing another power transmission coil, and an uneven shape that fills the space between each facing portion and the cooling portion is formed. A pedestal is provided. As a result, the power transmission coil and the cooling section come into contact with each other via the base, and heat is transferred from the power transmission coil to the cooling section via the base. Therefore, even multi-phase power transmission coils arranged in layers can be efficiently cooled by the cooling unit.

Circuit diagram showing the electrical configuration of the contactless power supply system A perspective view of a receiving coil in the first embodiment Perspective view of receiving coil with cover removed Bottom view with cover removed Cross-sectional view at VV position in FIG. Sectional view at VI-VI position in FIG. Sectional view at VII-VII position in FIG. Sectional view at VIII-VIII position in FIG. Bottom view with core aligned on cooling surface Bottom view with the core fixed in the holder View at XI position in FIG. Bottom view of holder Side view of holder Side view of holder Bottom view of the comparative example with the cores arranged FIG. 10 is a diagram showing coupling coefficients of a comparative example and this embodiment; Diagram showing the relationship between the protrusion height and the bolt loss ratio with respect to the core height Bottom view of the comparative example with the cover removed Sectional view at IXX-IXX position in FIG. FIG. 11 is a diagram showing the maximum temperature of the coils of the comparative example and the present embodiment; The bottom view of the state which attached the cover in 1st Embodiment. Sectional view at XXII-XXII position in FIG. Cross-sectional view with the cover attached in the comparative example FIG. 11 is a diagram showing the maximum temperature of the coils of the comparative example and the present embodiment; The bottom view of the state which removed the cover in 2nd Embodiment. Sectional view at XXVI-XXVI position in FIG. Perspective view with cover attached Bottom view with cover Sectional view at position IXXX-IXXX in FIG. Side view of a resin holder in another embodiment

<First embodiment>
The contactless power supply system 10 in this embodiment includes a power transmitting device 20 that wirelessly transmits power supplied from a commercial power source 11 and a power receiving device 30 that wirelessly receives power from the power transmitting device 20 . The power transmission device 20 is embedded in the ground such as a road (highway, etc.) on which a vehicle travels, a parking space where the vehicle is parked, 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 battery 12 by outputting electric power to the vehicle battery 12 as a storage battery.

FIG. 1 shows an electrical configuration of a contactless power supply system 10 according to this embodiment. A power transmission device 20 of the contactless power supply system 10 is connected to a commercial power source 11 and is configured to input AC power supplied from the commercial power source 11 to the power transmission device 20 . On the other hand, the vehicle-mounted battery 12 is connected to the power receiving device 30 of the contactless power supply system 10, and is configured to output electric power from the power receiving device 30 to the vehicle-mounted battery 12 for charging. The power transmitting 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, and W-phase) coils.

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

The AC-DC converter 21 converts AC power supplied from the commercial power supply 11 into DC power, and supplies the DC power 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 of a predetermined frequency (85 kHz, for example). 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 and off the switching elements provided in each arm.

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

The power transmission resonance circuit 24 is a circuit that outputs the AC power input from the power transmission filter circuit 23 to the power receiving device 30 . The power transmission resonance circuit 24 is power transmission side resonance units 24 a and 24 b in which a power transmission side capacitor 25 and a power 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;

The power receiving resonance circuit 31 is a circuit that inputs power from the power transmission resonance circuit 24 in a contactless manner and outputs the power to the power receiving filter circuit 32 . The power receiving resonance circuit 31 is configured to be capable of magnetic resonance with the power transmission resonance circuit 24 . Specifically, the power receiving resonance circuit 31 includes power receiving side resonance units 31a, 31b, and 31c in which power receiving side capacitors 35u, 35v, and 35w and power receiving coils 36u, 36v, and 36w are connected in series for 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 . The power receiving filter circuit 32 has a coil, a capacitor, and a coil connected in a T shape, and acts as an immittance filter. The power reception filter circuit 32 is provided for each phase, and one end of the capacitor of each phase (the end not connected to the coil) is connected at a connection point N1.

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

The DC-DC converter 34 transforms the DC power input from the rectifier circuit 33 and outputs it to the vehicle-mounted battery 12 . The vehicle-mounted 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 reception control unit 37 controls the DC-DC converter 34 and the like. In addition, the vehicle is provided with an ECU 13 (Electronic Control Unit), which instructs a power reception control unit 37 to perform contactless power supply while the vehicle is running, and to charge the vehicle battery 12 .

According to the above configuration, when 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 field resonance is possible, the power transmission coil 26, the power reception coil 36, will resonate with the magnetic field. Thereby, the power receiving device 30 receives part of the 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, a housing H that accommodates the power receiving coils 36u, 36v, 36w and the power receiving coils 36u, 36v, 36w and is attached to the vehicle will be described with reference to FIGS. 2 and 3. FIG. The housing H accommodates the power receiving coils 36u, 36v, and 36w so that the plane thereof is parallel to the ground, and cools the power receiving coils 36u, 36v, and 36w, and has a mounting structure to the vehicle; A cover 50 that covers the receiving coils 36u, 36v, and 36w. In the following description, the front-rear direction of the vehicle (the direction in which arrows F and B extend in the figure) is defined as the front-rear direction, the top of the vehicle (the direction in which arrow T extends in the figure) is defined as the top, and the bottom of the vehicle (the direction in which arrow T extends). The direction in which arrow D extends) is the downward direction, and the direction orthogonal to the front-rear direction and the vertical direction (the direction in which arrows L and F in the drawing extend) is the left-right direction.

As shown in FIGS. 3 and 4, a cooling unit 40 is provided to cool the receiving coils 36u, 36v, and 36w. The cooling portion 40 has a cooling body portion 42 having a cooling surface 41 . The cooling main body 42 is a plate-like member made of aluminum. The cooling surface 41 is the surface of the cooling main body 42 on the side of the power receiving coils 36u, 36v, and 36w, and is the 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, and 36w are arranged in a layered manner below the core 60 (on the ground side). Core 60 and receiving coils 36u, 36v, and 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 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, and 36w.

As shown in FIGS. 2 and 3, a mounting portion 43 is provided on the vehicle-side surface of the cooling body portion 42 for mounting the housing H containing the receiving coils 36u, 36v, and 36w to the bottom surface of the vehicle. there is The mounting portions 43 are plate-shaped members that are provided at both ends in the width direction of the cooling main body portion 42 and extend in the front-rear direction. A predetermined space is formed with the bottom surface of the vehicle by providing the mounting portion 43 . As a result, the cooling body portion 42 can be air-cooled by the running wind of the vehicle. Further, in the space between the cooling main body portion 42 formed by the mounting portion 43 and the bottom surface of the vehicle, thin plate-like fins 44 are provided so as to protrude from the cooling main body portion 42 toward the vehicle side. Promote heat dissipation from the portion 42 .

As shown in FIG. 3, on the cooling surface 41 of the cooling main body 42, a pedestal portion 45 for fixing the receiving coils 36u, 36v, and 36w onto the cooling surface 41 is provided integrally with the cooling main body 42. . The pedestal portions 45 are provided at both ends in the width direction of the cooling surface 41 and are formed to extend in the front-rear direction. The base portion 45 is provided with screw holes for fixing the receiving coils 36u, 36v, and 36w with screws. In addition, the pedestal 45 is provided with cutouts for pulling out the ends of the conductors of the receiving coils 36u, 36v, and 36w to the outside. Note that 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 receiving coils 36u, 36v, and 36w and the holder 70 for holding the core 60 will be described. As shown in FIG. 9 , cores 60 are arranged on the cooling surface 41 of the cooling main body 42 . Core 60 is made of ferrite and acts as an iron core of power receiving coils 36u, 36v, and 36w. The cores 60 are rectangular parallelepipeds that are long in the front-rear direction and short in the width direction (horizontal direction). The plurality of cores 60 are arranged in a row without gaps in the front-rear direction. Therefore, the cores 60 are arranged in a plurality of rows on the cooling surface 41 between the pedestals 45 with a predetermined space S provided therebetween.

10 and 11, each core 60 is fixed on the cooling surface 41 by a holder 70. As shown in FIGS. The holder 70 is made of resin and, as shown in FIGS. and a second fixing portion 73 provided so as to protrude from the other side of 71 . The core holding portion 71 is a flat member having the same width dimension as the width dimension of the core 60 and having a dimension in the longitudinal direction slightly smaller than the dimension in the longitudinal direction of the core 60. It is provided on the lower side of the core 60 (on the side opposite to the cooling surface 41 ) so as to be sandwiched between 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 protrude 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 on the side of the gap S (left-right direction side). The second fixing portion 73 is provided on the other side opposite to the first fixing portion 72 in the left-right direction so as to protrude outward in the left-right direction from the core holding portion 71 . Specifically, the second fixing portion 73 is 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 fixing portion 72 and the second fixing portion 73 are displaced from the fixing portions 72 and 73 of the holder 70 adjacent in the left-right direction in the direction in which the gap S extends (front-rear direction). As a result, the fixing portions 72 and 73 of the adjacent holders 70 do not overlap with each other and are staggered. It is possible to make only the width dimension of In this embodiment, the dimension of the gap S in the width direction is approximately the diameter of the metal bolt 80 .

As shown in FIGS. 13 and 14, each fixing part 72, 73 has a substantially rectangular parallelepiped shape and has a height dimension equal to or slightly smaller than the height dimension of the core 60. As shown in FIG. Each fixing part 72, 73 is provided with a bolt hole 74 into which the head 81 of the metal bolt 80 can be inserted. Each bolt hole 74 has a metal collar 75 disposed therein. The collar 75 may be insert-molded in advance, or may be fixed to the bolt hole 74 afterward. The holder 70 fixes the core 60 on the cooling surface 41 by screwing the threaded portion 82 of the metal bolt 80 into the threaded holes provided in the collar 75 and the cooling body portion 42 .

A heat transfer resin 76 having high heat transfer properties is preferably sandwiched between the core 60 and the cooling surface 41 . By providing the heat transfer resin 76 , an air gap between the core 60 and the cooling surface 41 can be removed while being fixed to the holder 70 . Therefore, the heat generated by the core 60 can be appropriately transferred to the cooling surface 41, and the heat of the core 60 can be dissipated.

The metal bolt 80 is a soft magnetic bolt such as an iron-based bolt. Therefore, when the metal bolt 80 is fixed, the projection height Hb (projection dimension downward from the cooling surface 41) is higher than the height Hc of the core 60 (height from the cooling surface 41). , a current flows through the metal bolt 80, and the loss during power transmission/reception increases. Therefore, the protrusion 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 current from flowing through the metal bolt 80 and reduce the loss. In the case of a non-metallic bolt such as a resin bolt, the projection height Hb of the bolt may be higher than the height Hc of the core 60 .

Differences resulting from changing the configuration of the core will be compared and examined between this embodiment and the comparative example shown in FIG. 15 . FIG. 15 is a bottom view of the comparative example in which 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, the core 260 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 resonating 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, regarding the magnetic coupling between the power transmitting coils 26a and 26b and the power receiving coils 36u, 36v and 36w, the present embodiment in which the gap S is provided between the cores 60 and the comparative example without the gap are different. Compare with FIG. 16 is a diagram showing coupling coefficients between the power transmitting coils 26a, 26b and the power receiving coils 36u, 36v, 36w in the comparative example and the present embodiment. As shown in FIG. 16, the coupling coefficients between the power transmitting coils 26a, 26b and the power receiving coils 36u, 36v, 36w are substantially the same between the present embodiment and the comparative example. That is, even if the minimum gap S for fixing the holder 70 is provided, the coupling coefficient hardly decreases, and the decrease in efficiency during power transmission/reception can be suppressed.

Next, the relationship between the protrusion height Hb of the metal bolt 80 and the loss rate will be considered. FIG. 17 is a diagram showing the relationship between the projection height Hb of the metal bolt 80 with respect to the height Hc of the core 60 and the bolt loss ratio. Specifically, it shows the ratio of the bolt loss to the loss of the receiving coils 36u, 36v, and 36w during power transmission/reception when the projecting height Hb of the metal bolt 80 with respect to the height Hc of the core 60 is variable. The losses in the power receiving coils 36u, 36v, and 36w include losses in the power receiving coils 36u, 36v, and 36w, losses in the core 60, and losses in the cooling body 42. As shown in FIG. 17, when the protrusion height Hb of the metal bolt 80 is made lower than the height Hc of the core 60, even the metal bolt 80 made of iron (soft magnetic material) has an almost negligible amount of 1% or less. , can reduce the rate of bolt loss.

Next, the receiving coils 36u, 36v, and 36w will be described with reference to FIGS. 3 and 4. FIG. The power receiving coils 36u, 36v, and 36w are rectangular planar coils, and are formed by winding conductive wires (for example, litz wires) covered with an insulating material around the bobbin 38 in a planar shape. Each of the power receiving coils 36u, 36v, and 36w has a width portion 36a extending in the width direction (horizontal direction) perpendicular 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 serves as an effective area that contributes to power feeding while the vehicle is running, while the connecting portion 36b extending in the traveling direction of the vehicle serves as an effective region for power feeding while the vehicle is running. It is a part that does not contribute much. The power receiving coils 36u, 36v, and 36w have the same shape and the same number of turns.

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

It should be noted that the width of one side of the bobbin 38 is preferably provided to the inner side of the area around which the conductive wire is wound. By making the width of one side of the bobbin 38 larger than the area around which the conductive wire is wound, the bobbin 38 itself is less likely to bend. Also, the bobbin 38 may be divided in half at the central position in the front-rear direction and used in combination. If the bobbin 38 is large, dividing it facilitates molding.

The conducting wires of the receiving coils 36u, 36v, and 36w are insulated by using an insulating coating such as enamel on the conducting wires themselves, and are insulated from the cooling unit 40 by the bobbin 38 . In other words, it is double-insulated and suitable for use in the contactless power supply system 10 that transmits and receives a large amount of power. It is desirable that the insulating coating and the insulating members such as the bobbin 38 are thin enough not to hinder the heat transfer from the conductors of the power receiving coils 36u, 36v, and 36w to the pedestal portion 45 .

The receiving coils 36u, 36v, and 36w are stacked vertically so that their planes overlap. How the receiving coils 36u, 36v, and 36w are stacked will be described with reference to FIGS. 3 and 5. FIG. The U-phase power receiving coil 36u is arranged at a position (uppermost part) closest to the cooling surface 41 in the stacking direction. The V-phase receiving coil 36v is arranged at an intermediate position in the stacking direction. The W-phase power receiving coil 36w is arranged at the furthest position (lowermost part) from the cooling surface 41 in the stacking direction. The V-phase power receiving coil 36v may be arranged at the farthest position 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, and 36w stacked in this manner are shifted in a direction orthogonal to the stacking direction, specifically, in the front-rear direction. At that time, the areas surrounded by the power receiving coils 36u, 36v and 36w are arranged so as to partially overlap with the areas surrounded by the other power receiving coils 36u, 36v and 36w. Specifically, the receiving coils 36u, 36v, and 36w are arranged so as to be shifted at regular intervals in the front-rear direction. More specifically, they are arranged with an electrical angle shift of 120°. In the present embodiment, the U-phase power receiving coil 36u, which is located between the other two in terms of electrical angle, is arranged in the center in the front-rear direction, and the V-phase and W-phase power receiving coils 36v and 36w are arranged in the U-phase power receiving coils 36v and 36w. They are arranged on both sides in the front-rear direction of the coil 36u.

4 and 5, each power receiving coil 36u, 36v, 36w is cooled without intervening other power receiving coils 36u, 36v, 36w. A facing portion 36c facing the surface 41 is provided. That is, the U-phase power receiving coil 36u positioned closest to the cooling surface 41 in the stacking direction has the entire facing portion 36c. The V-phase power receiving coil 36v positioned at an intermediate position in the stacking direction is arranged outside (front side) of the power receiving coil 36u in the front-rear direction in the entire width portion 36a and the connection portion 36b thereof. and the opposite portion 36c. The W-phase power receiving coil 36w positioned farthest from the cooling surface 41 in the stacking direction is located outside (rear side) of the power receiving coil 36u in the front-rear direction of the entire width portion 36a and the connection portion 36b thereof. ) is the facing portion 36c.

Since the power receiving coils 36u, 36v, and 36w are stacked, the facing portions 36c of the power receiving coils 36u, 36v, and 36w have different distances from the cooling surface 41, respectively. Of course, in the connection portion 36b fixed to the pedestal portion 45, the distance from the cooling surface 41 to the facing portion 36c differs for each of the power receiving coils 36u, 36v, and 36w. For this reason, if a pedestal portion having the same height 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, and the heat of the receiving coils 36v and 36w is not directly transmitted to the pedestal.

Therefore, in this embodiment, the pedestal portion 45 is formed so as to have an uneven shape that fills the space between the cooling surface 41 and the opposing portions 36c of the receiving coils 36u, 36v, and 36w in the connection portion 36b. That is, the pedestal portion 45 includes first convex portions 45a and second convex portions 45a and 45a having different projecting dimensions from the cooling surface 41 depending on the distance from the facing portions 36c of the receiving coils 36u, 36v, and 36w to the cooling surface 41. A portion 45b and a third convex portion 45c are provided.

Specifically, as shown in FIGS. 5 and 7, in the base portion 45, a first convex portion 45a is formed in a portion of the base portion 45 that overlaps (faces) the facing portion 36c of the power receiving coil 36u that is closest to the cooling surface 41. is provided. The first convex portion 45a is formed to protrude from the cooling surface 41 until it abuts on 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. . Note that 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 in a portion of the pedestal portion 45 that faces the facing portion 36c of the receiving coil 36v that is the second farthest from the cooling surface 41. ing. The second convex portion 45b is formed so as to protrude from the cooling surface 41 so as to fill the space between the cooling surface 41 and the facing portion 36c until it comes into contact with the facing portion 36c of the power receiving coil 36v. 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 that the height dimension is larger than that of the first convex portion 45a. ing. Specifically, the second convex portion 45b is formed 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 that faces the facing portion 36c of the power receiving coil 36w that is farthest from the cooling surface 41. . The third convex portion 45c is formed so as to protrude from the cooling surface 41 to contact 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 that the height dimension is larger than that of the second convex portion 45b. ing. Specifically, the third convex portion 45c is formed larger than the second convex portion 45b by the height dimension of the power receiving coil 36v.

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

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

In the present embodiment, heat is radiated from the power receiving coils 36u, 36v, and 36w by the cooling main body 42 via the pedestal 45 . At this time, as shown in FIGS. 3 to 5, the U-phase power receiving coil 36u positioned in the middle in terms of electrical angle is arranged at the uppermost portion (on the side of the cooling surface 41). The power receiving coil 36v is shifted forward from the power receiving coil 36u in the front-rear direction, and the power receiving coil 36w is shifted to the opposite side from the power receiving coil 36v, that is, to the rear side from 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 connecting portion 36b of the U-phase power receiving coil 36u without the interposition of the U-phase power receiving coil 36u. A facing portion 36c is provided. Therefore, the pedestal portion 45 is configured to have an uneven shape so as to be in contact with the facing portions 36c of the power receiving coils 36u, 36v, and 36w. Therefore, heat is transferred from all of the power receiving coils 36 u, 36 v, and 36 w to the cooling main body 42 via the pedestal 45 .

In order to demonstrate the effectiveness of this embodiment, it will be described in comparison with comparative examples shown in FIGS. In the comparative example, among the power receiving coils 36u, 36v, and 36w, the U-phase power receiving coil 36u, which is located between the other two in terms of electrical angle, is arranged at the farthest position from the cooling surface 41, that is, on the lowest side. there is In such an arrangement, the connection portion 36b between the pedestal portion 45 and the power receiving coil 36u can be contacted only through the other power receiving coils 36v and 36w. In other words, the U-phase power receiving coil 36u cannot be thermally connected to the base portion 45, that is, the cooling body portion 42.

Regarding the temperature of the power receiving coils 36u, 36v, 36w, a comparison was made between this embodiment in which all the power receiving coils 36u, 36v, and 36w are in contact with the pedestal portion 45 and a portion of the power receiving coils 36u, 36v, and 36w that cannot transfer heat to the pedestal portion 45. Compare with example. FIG. 20 is a diagram showing maximum temperatures of the receiving coils 36u, 36v, and 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 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, and 36w can be reduced, and the size of the power receiving coils 36u, 36v, and 36w can be reduced.

Moreover, as shown in FIGS. 4 and 22, each of the power receiving coils 36u, 36v, and 36w is provided with a cover facing portion 36d that faces the cover 50 without interposing another power receiving coil. The W-phase receiving coil 36w positioned closest to the cover 50 in the stacking direction has a cover-facing portion 36d in its entirety. The V-phase power receiving coil 36v positioned at an intermediate position in the stacking direction has its entire width portion 36a and a portion located forward of the power receiving coil 36w in the front-back direction facing the cover facing portion 36d. It's becoming

The entire width portion 36a of the U-phase power receiving coil 36u positioned farthest from the cover 50 in the stacking direction is the cover facing portion 36d. The connection 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 explained. As shown in FIGS. 2, 21, and 22, a resin cover 50 is provided to cover the power receiving coils 36u, 36v, and 36w that are stacked and fixed in the vertical direction. The cover 50 is arranged on the ground side (lower side) than the power receiving coils 36u, 36v, and 36w, and is made of a material that does not interfere with magnetic field resonance with the power transmitting device 20 . The cover 50 has a substantially rectangular shape when viewed from the bottom, and a side wall projecting toward the cooling main body 42 is provided on the outer peripheral edge of the cover 50 so as to surround the cover 50 . This side wall is screwed to the cooling body portion 42 .

The shape of the cover 50 will be described. As shown in FIG. 2, the cover 50 is provided with an uneven shape. Specifically, the cover 50 has a first cover portion 51w positioned closest to the ground and a second cover portion 51v recessed toward the cooling surface 41 from the first cover portion 51w in the vertical direction.

The first cover portion 51w is provided in a rectangular plate shape so as to cover the entire area of the power receiving coil 36w positioned closest to the ground, 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 the shape of a square plate. 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 to be substantially the same. Therefore, the first cover portion 51w and the second cover portion 51v are provided in a stepped manner, and the second cover portion 51v is thicker than the first cover portion 51w by the thickness dimension of the power receiving coil 36w. It is recessed on the side of the cooling surface 41 (upper side). With the first cover portion 51w and the second cover portion 51v, the outer surface 50b of the cover 50 is provided with a recessed portion 52 having a stepped shape.

Further, as shown in FIGS. 2, 21 and 22, a first recessed portion 53 recessed upward (toward the cooling surface 41) is provided in 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 that is provided in an annular shape.

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

In the vertical direction, the thickness dimension of the bottom portion of the first recessed portion 53 is approximately 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.). are the same. On the other hand, the positions of the cover facing portions 36d of the receiving coils 36v and 36w are different in the vertical direction. For this reason, a step is provided on the bottom to match the positions of the cover-facing portions 36d of the power receiving coils 36v and 36w. That is, the bottom has a first bottom portion 53a that covers the cover facing portion 36d of the power receiving coil 36v on the front side in the front-rear direction, and a second bottom portion 53b that covers the cover facing portion 36d of the power receiving coil 36u on the rear side. have The second bottom portion 53b is positioned above (on the cooling surface 41 side) the first bottom portion 53a.

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. Also, 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 sum 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, the inner portion of the second cover portion 51v is provided with a second recessed portion 54 recessed upward (toward the cooling surface 41). The second recessed portion 54 is provided in a portion where the power receiving coil 36v is not provided. That is, the second recessed portion 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 recessed toward the cooling surface 41 so that the bottom of the second recessed portion 54 contacts 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 recessed portion 54 is substantially the same as the thickness dimension of the other covers 50 (that is, the thickness dimension of the first cover portion 51w, the second cover portion 51v, etc.). It's becoming Therefore, the depth dimension (the dimension from the second cover part 51v to the bottom) of the second recessed portion 54 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.

Accordingly, the cover 50 is provided with the recessed portion 52 formed by the first recessed portion 53 and the second recessed portion 54 .

As described above, the cover 50 includes a second cover recessed upward (toward the power receiving coils 36u, 36v, 36w) at a position overlapping the cover facing portion 36d of each of the power receiving coils 36u, 36v in the stacking direction. A portion 51v, a first recessed portion 53, and a second recessed portion 54 are formed. As a result, the inner surface 50a of the cover 50 is provided with an uneven shape corresponding to the position of each cover facing portion 36d in the vertical direction (stacking direction). Therefore, the inner surface 50a of the cover 50 is brought into contact with the cover-facing portions 36d of the power receiving coils 36u, 36v, and 36w. The power receiving coils 36u, 36v, and 36w are held on the cooling body 42 side by abutting the cover-facing portions 36d of the power receiving coils 36u, 36v, and 36w against the inner surface 50a of the cover 50 . In addition, since the cover-facing portion 36d of each of the power receiving coils 36u, 36v, and 36w is in direct contact with the inner surface 50a of the cover 50, heat is transferred from each of the power receiving coils 36u, 36v, and 36w to the cover 50 with higher heat transfer efficiency than via air. can be heated.

In addition, 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 has the power receiving coils in the vertical direction. A recessed portion 52 recessed upward is provided at a position facing the cover facing portion 36d of 36u, 36v, and 36w. The depth dimension (recess dimension) from the first cover portion 51w to the second cover portion 51v, the depth dimension from the first cover portion 51w to the first bottom portion 53a of the first recess portion 53 (recess dimension), the The depth dimension (recess dimension) from the first cover portion 51w to the second bottom portion 53b of the first recess portion 53 and the depth dimension (recess dimension) from the first cover portion 51w to the bottom portion of the second recess portion 54 are They are made different according to the distance from the reference position R (the position of the first cover portion 51w covering the power receiving coil 36w) to the cover facing portion 36d of each of the power receiving coils 36u and 36v. As a result, the thicknesses of the portions of the receiving coils 36u, 36v, and 36w that cover the cover facing portion 36d are uniform. Therefore, the thermal resistance from each of the power receiving coils 36u, 36v, and 36w to the cover 50 can be made uniform, and heat radiation from the power receiving coils 36u, 36v, and 36w from the cover 50 can be performed appropriately.

In order to show the effectiveness of this embodiment, it is compared with the comparative example shown in FIG. FIG. 23 is a 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 are in 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 flattened so as to cover the power receiving coil 36w located farthest from the cooling body 42 . That is, the thickness of the portion of the cover 250 that covers the cover facing portion 36d varies depending on the location.

Regarding the temperature of the power receiving coils 36u, 36v, and 36w, the thickness of the cover 50 covering the cover facing portion 36d of each of the power receiving coils 36u, 36v, and 36w is uniform in this embodiment, and the cover facing portion 36d of the power receiving coils 36u, 36v, and 36w has a uniform thickness. A comparison is made with a comparative example in which the thickness of 250 differs depending on the location. FIG. 24 is a diagram showing maximum temperatures of power receiving coils 36u, 36v, and 36w in 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, and 36w can be reduced, and the size of the power receiving coils 36u, 36v, and 36w can be reduced.

According to this embodiment detailed above, the following excellent effects are obtained.

When a plurality of power receiving coils 36u, 36v, and 36w are stacked on the cooling surface 41, the power receiving coils 36v and 36w arranged on the side away from the cooling unit 40 (cooling surface 41) and the cooling surface Other receiving coils 36 u and 36 v are arranged between the coils 41 and 41 , and the receiving coils 36 v and 36 w 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, and 36w are provided with facing portions 36c that face the cooling surface 41 of the cooling unit 40 without interposing the other power receiving coils 36u, 36v, and 36w. A pedestal portion 45 having an uneven shape is provided so as to fill the space between the portion 36 c and the cooling surface 41 . As a result, the receiving coils 36u, 36v, and 36w are in thermal contact with the cooling unit 40 via the pedestal portion 45, and the receiving coils 36u, 36v, and 36w are cooled. Therefore, even the multiphase receiving coils 36u, 36v, and 36w arranged in layers can be efficiently cooled by the cooling unit 40 .

The distances from the opposing portions 36c of the power receiving coils 36u, 36v, and 36w to the cooling surface 41 of the cooling unit 40 are different, and the projections 45a, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b, 45b and 45c is provided. Thereby, different separation distances can be filled by the projections 45 a , 45 b , 45 c of the pedestal 45 .

Width portions 36a of the power receiving coils 36u, 36v, and 36w are effective regions that contribute to power feeding while the vehicle is running, while connecting portions 36b that extend in the traveling direction of the vehicle do not contribute much to power feeding. Therefore, by contacting the pedestal portion 45 with the connecting portion 36b, it is possible to efficiently transmit and receive power even during running, and to ensure necessary heat transferability.

When the three-phase coils are stacked by shifting by a predetermined electrical angle, if the U-phase receiving coil 36u positioned between the two coils in terms of electrical angle is at the farthest position from the cooling surface 41 in the stacking direction. , the connection portion 36b overlaps with the other receiving coils 36u, 36v, and 36w, so heat cannot be transferred to the cooling portion 40. As shown in FIG. Therefore, the U-phase power receiving coil 36u is arranged at the 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 be brought into contact with the pedestal portion 45 without passing through other power receiving coils. Therefore, the receiving coils 36u, 36v, and 36w of all the phases can contact the cooling section 40 through the pedestal section 45 at the connecting portion 36b, and necessary heat transferability can be ensured.

The inner surface 50a of the cover 50 is formed with an uneven shape so as to abut against the cover-facing portions 36d of the power receiving coils 36u, 36v, and 36w. can. On the outer surface 50b of the cover 50, recesses 52 recessed toward the power receiving coils 36v and 36w are provided at positions overlapping the cover facing portions 36d of the power receiving coils 36v and 36w in the stacking direction (vertical direction). As a result, the thickness of the cover 50 can be reduced at the positions where the power receiving coils 36u, 36v, and 36w overlap the cover-facing portions 36d, and the heat of the power receiving coils 36u, 36v, and 36w is released from the cover 50 to the outside. easier to do.

On the outer surface 50b of the cover 50, when the first cover portion 51w is used as a reference (reference position R) in the stacking direction, the distance from the first cover portion 51w to the cover facing portion 36d of each of the power receiving coils 36v and 36w is measured. Accordingly, recesses 52 having different recess dimensions were formed. That is, the recess dimension from 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 bottom portion of the second recess portion 54 is set to It was set according to the distance from each of the receiving coils 36v and 36w to the cover facing portion 36d. As a result, the portion where the distance from the first cover portion 51w to the cover facing portion 36d is large, that is, the portion where the cover 50 is thick can be made thin, and variations in the heat dissipation of the power receiving coils 36u, 36v, and 36w can be suppressed. can be done.

The cover 50 is configured to have a uniform thickness at the positions where the power receiving coils 36u, 36v, and 36w are covered. As a result, the heat resistance of the cover 50 at the position that covers the receiving coils 36u, 36v, and 36w and receives heat can be made uniform. Therefore, it is possible to further suppress variations in the heat dissipation of the power receiving coils 36u, 36v, and 36w.

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

A plurality of cores 60 are aggregated instead of a single plate. Then, each finely configured core 60 is fixed to the cooling main body 42 by a holder 70 . As a result, it is possible to suppress an increase in the thickness dimension and strength of the member that holds the cores 60, which is the holder 70 in the present embodiment.

The cores 60 are arranged in a plurality of rows, and the first fixing portion and the second fixing portion are arranged in the gaps S formed between the rows of the cores 60 . At this time, the fixing positions of the holders 70 are shifted from the fixing positions of the holders 70 in the adjacent row along the direction in which the gap S extends (the front-rear direction), and are staggered. In other words, the fixing positions of adjacent holders 70 do not overlap and interfere with each other. Therefore, the size of the gap S can be reduced to one width of the fixing portion, and can be minimized.

A first fixing portion 72 fixed to the cooling body portion 42 is provided at both ends of one side of the core holding portion 71 on the side of the gap, and the other side opposite to the one side, that is, the other side on the other side of the gap S is provided. is provided with a second fixing portion 73 fixed to the cooling body portion 42 . That is, since it is fixed at three points, 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 made smaller.

In order to secure a predetermined fastening force, a metal bolt, especially a metal bolt 80 made of a soft magnetic material such as iron is used in some cases. When the metal bolt 80 made of a soft magnetic material such as iron is used, if the height Hb of the protrusion of the metal bolt 80 from the cooling 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 increases. Therefore, the projecting 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 current from flowing through the metal bolt 80, and reduce the power transmission/reception loss.

<Second embodiment>
In the second embodiment, the U-phase power receiving coil 36u positioned in the middle in terms of electrical angle is arranged in the middle position in the stacking direction. Note that the same reference numerals as in the first embodiment are used for the same configurations as in the first embodiment, and the description thereof is omitted.

As shown in FIGS. 25 and 26, on the cooling surface 41 of the cooling body 42, a pedestal 145 for fixing the receiving coils 36u, 36v, and 36w onto the cooling surface 41 is provided integrally with the cooling body 42. It is First, how the power receiving coils 36u, 36v, and 36w are stacked by the pedestal portion 145 will be described. The U-phase receiving coil 36u is located at an intermediate position in the stacking direction. The V-phase power receiving coil 36v is positioned closest to the cooling surface 41 in the stacking direction (uppermost position), and the W-phase power receiving coil 36w is positioned farthest from the cooling surface 41 in the stacking direction (lowermost position). located in The V-phase power receiving coil 36v may be positioned furthest from the cooling surface 41 in the stacking direction, and the W-phase power receiving coil 36w may be positioned closest to the cooling surface 41 in the stacking direction. Further, similarly to the first embodiment, the power receiving coil 36u is arranged at the center in the front-rear direction. The power receiving coil 36v is shifted to the front side of the power receiving coil 36u in the front-rear direction, and the power receiving coil 36w is shifted to the opposite side of the power receiving coil 36v, that is, to the rear side of the power receiving coil 36u. .

In addition, since the power receiving coils 36u, 36v, and 36w are displaced in the front-rear direction, each of the power receiving coils 36u, 36v, and 36w has a facing portion 136c that faces the cooling surface 41 without the other power receiving coils 36u, 36v, and 36w interposed therebetween. will be established. That is, the V-phase power receiving coil 36v positioned closest to the cooling surface 41 in the stacking direction has the entire facing portion 136c. The U-phase power receiving coil 36u positioned at an intermediate position in the stacking direction is arranged outside (rear side) of the power receiving coil 36v in the front-rear direction in the entire width portion 36a and the connection portion 36b thereof. The facing portion 136c is formed between the portion where the The W-phase power receiving coil 36w positioned farthest from the cooling surface 41 in the stacking direction is located outside (rear side) of the power receiving coil 36u in the front-rear direction in the entire width portion 36a and the connecting portion 36b thereof. The portion arranged in the opposite direction is the facing portion 136c.

At the connecting portion 36b, a pedestal portion 145 is formed to have an uneven shape so as to fill the space between the facing portion 36c of each of the receiving coils 36u, 36v, and 36w and the cooling surface 41. As shown in FIG. That is, the pedestal portion 145 includes a first convex portion 145a, a second convex portion 145b, and a third convex portion 145b having different projecting dimensions depending on the distance from the facing portion 36c of each of the receiving coils 36u, 36v, and 36w to the cooling surface 41. A protrusion 145c is provided.

Specifically, in the pedestal portion 145, a first convex portion 145a is provided in a portion that overlaps (faces) the facing portion 36c of the power receiving coil 36v that is closest to the cooling surface 41. As shown in FIG. The first convex portion 145a is formed to protrude from the cooling surface 41 until it abuts on 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 frontmost side in the front-rear direction. Note that 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, a second convex portion 145b is provided in a portion of the pedestal portion 145 that faces the facing portion 36c of the receiving coil 36u that is the second farthest from the cooling surface 41 . The second convex portion 145b is formed so as to protrude from the cooling surface 41 so as to fill the space between the cooling surface 41 and the facing portion 36c until it comes into contact with the facing portion 36c of the power receiving coil 36u. The second convex portion 145b is provided at an intermediate position behind the first convex portion 145a (that is, the power receiving coil 36v) in the front-rear direction, and is larger in height than the first convex portion 145a. is provided as follows. Specifically, the second convex portion 145b is formed larger than the first convex portion 145a by the height dimension of the power receiving coil 36v.

Similarly, a third convex portion 145c is provided in a portion of the pedestal portion 145 that faces the facing portion 36c of the power receiving coil 36w that is farthest from the cooling surface 41 . The third convex portion 145c is formed to protrude from the cooling surface 41 to contact 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 projecting portion 45c is provided on the rear side of the second projecting portion 145b (that is, the power receiving coil 36u) in the front-rear direction, and is provided so that the height dimension thereof is larger than that of the second projecting portion 145b. ing. Specifically, the third convex portion 145c is formed 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 that fills the gap between the cooling surface 41 and the facing portion 36c in the connecting portion 36b of the receiving coils 36u, 36v, and 36w by the first convex portion 145a to the third convex portion 145c. A part 145 is configured.

Also in the present embodiment, heat is radiated from the power receiving coils 36u, 36v, and 36w by the cooling body 42 via the pedestal 145 . At this time, the U-phase receiving coil 36u positioned in the middle in terms of electrical angle is arranged at the middle position. The power receiving coil 36v is shifted forward from the power receiving coil 36u in the front-rear direction, and the power receiving coil 36w is shifted to the opposite side from the power receiving coil 36v, that is, to the rear side from the power receiving coil 36u.

As a result, the connection portion 36b of the U-phase and W-phase power receiving coils 36u and 36w is opposed to the portion that does not overlap the connection portion 36b of the V-phase power receiving coil 36v, that is, without interposing the V-phase power receiving coil 36v. A facing portion 136c is provided. Therefore, the pedestal portion 145 is configured to have an uneven shape so as to be in contact with the facing portions 136c of the receiving coils 36u, 36v, and 36w. Therefore, heat is conducted from all of the power receiving coils 36 u, 36 v, and 36 w to the cooling main body 42 via the pedestal 145 .

In order to demonstrate the effectiveness of this embodiment, it will be described in comparison with comparative examples shown in FIGS. As shown in FIG. 20, the 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, and 36w can be reduced, and the size of the power receiving coils 36u, 36v, and 36w can be reduced. Note that the first embodiment and the second embodiment have substantially the same effects.

Further, as shown in FIGS. 26 and 28, each of the power receiving coils 36u, 36v, and 36w is provided with a cover facing portion 136d that faces the cover 150 without interposing another power receiving coil. The W-phase power receiving coil 36w positioned closest to the cover 150 in the stacking direction has a cover-facing portion 136d in its entirety. The U-phase power receiving coil 36u positioned at an intermediate position in the stacking direction has its entire width portion 36a and a portion located forward of the power receiving coil 36w in the front-back direction facing the cover facing portion 136d. It's becoming The V-phase power receiving coil 36v located farthest from the cover 150 in the stacking direction has its entire width portion 36a and the portion located forward of the power receiving coil 36u in the front-rear direction covered. It is a facing portion 136d.

Next, the cover 150 will be described with reference to FIGS. 27-29. The cover 150 is provided with an uneven shape. Specifically, the cover 150 has a first cover portion 151w positioned closest to the ground, and a second cover portion 151v and a third cover portion 151u that are recessed toward the cooling surface 41 from the first cover portion 151w in the vertical direction. .

The first cover portion 151w is provided in a rectangular plate shape so as to cover the entire area of the power receiving coil 36w positioned closest to the ground, 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 has a rectangular plate shape. Specifically, the third cover portion 151u is provided 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 has a rectangular plate shape. Specifically, the second cover portion 151v is provided 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 substantially the same. Therefore, the first cover portion 151w, the second cover portion 151v, and the third cover portion 151u are provided stepwise. The third cover portion 151u is recessed toward the cooling surface 41 (upper side) by the thickness dimension of the power receiving coil 36w from the first cover portion 151w. The second cover portion 151v is recessed toward the cooling surface 41 (upper side) by the thickness dimension of the power receiving coil 36u from the third cover portion 151u. The first cover portion 151w, the second cover portion 151v, and the third cover portion 151u form a recessed portion 152 in a stepped (stair-like) shape on the outer surface 150b of the cover 150. As shown in FIG.

A first recessed portion 153 recessed upward (toward the cooling surface 41) is provided in the inner portion of the first cover portion 151w. 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 that is provided in an annular shape.

A bottom portion of the first recess portion 153 is provided so as to abut on 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 and 36w that contacts the bottom of the first recess 153 is the width portion 36a of the power receiving coils 36v and 36w on the rear side in the front-rear direction.

In the vertical direction, the thickness dimension of the bottom portion of the first recessed portion 153 is equal to the thickness dimension of the other covers 150 (that is, the first cover portion 151w, the second cover portion 151v, the third cover portion 151u, etc.). thickness dimension). On the other hand, the positions of the cover facing portions 136d of the receiving coils 36v and 36w are different in the vertical direction. For this reason, a step is provided at the bottom in accordance with the positions of the cover-facing portions 136d of the receiving coils 36v and 36w. That is, the bottom has a second bottom portion 153b that covers the cover facing portion 136d of the power receiving coil 36v on the front side in the front-rear direction, and a first bottom portion 153a that covers the cover facing portion 136d of the power receiving coil 36u on the rear side. have The second bottom portion 153b is positioned above (on the cooling surface 41 side) the first bottom portion 153a.

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. Also, 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 concave portion 152 by the first concave portion 153 .

As described above, the cover 150 includes a second cover that is recessed upward (toward the power receiving coils 36u, 36v, 36w) at a position overlapping the cover facing portion 136d of each of the power receiving coils 36u, 36v in the stacking direction. A portion 151v, a third cover portion 151u, and a first recess 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 inner surface 150a of the cover 150 is brought into contact with the cover-facing portions 136d of the receiving coils 36u, 36v, and 36w. The power receiving coils 36u, 36v, and 36w are held on the cooling body 42 side by abutting the cover-facing portions 136d of the power receiving coils 36u, 36v, and 36w against the inner surface 150a of the cover 150 . In addition, since the cover-facing portion 136d of each of the power receiving coils 36u, 36v, and 36w is in direct contact with the inner surface 150a of the cover 150, heat is transferred from each of the power receiving coils 36u, 36v, and 36w to the cover 150 with higher heat transfer efficiency than via air. can be heated.

In addition, 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 recess portion 153, the outer surface 150b of the cover 150 has the power receiving portion 151b in the vertical direction. A recessed portion 152 recessed upward is provided at a position facing the cover facing portion 136d of the coils 36u, 36v, and 36w. The depth dimension (recess dimension) from the first cover portion 151w to the second cover portion 151v, the depth dimension (recess dimension) from the first cover portion 151w to the third cover portion 151u, and the depth dimension from the first cover portion 151w The depth dimension (recess dimension) to the first bottom portion 153a of the first recess portion 153 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 the reference positions. The distance from R (the position of the first cover portion 151w covering the power receiving coil 36w) to the cover facing portion 136d of each of the power receiving coils 36u and 36v is varied. As a result, the thickness of the portions of the receiving coils 36u, 36v, and 36w that cover the cover facing portion 136d is uniform. Therefore, the thermal resistance from each of the power receiving coils 36u, 36v, and 36w to the cover 150 can be made uniform, and heat can be appropriately radiated from the cover 150 of each of the power receiving coils 36u, 36v, and 36w.

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

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

- You may cool the cooling main-body part 42 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. The projecting height Hb of the metal bolt 280 may be made lower than the height Hc of the core 60 by using a low head bolt. In addition, by providing the cooling main body portion 42 with a recess with which the fixing portions 72 and 73 abut or by providing a groove for recessing the gap S, the protrusion height Hb of the metal bolt 80 is made lower than the height Hc of the core 60. You can make it

- You may provide the base part contact|abutted on the width part 36a of receiving coil 36u, 36v, 36w. Each of the bobbins 38 may be fixed to the pedestal at opposing portions 36c, 136c provided in the width portion 36a of the power receiving coils 36u, 36v, 36w. In this case, part of the core 60 should be removed to provide a pedestal.

In addition to the pedestal portions provided at both ends of the cooling surface 41 in the width direction, the gap S between the core 60 on the cooling surface 41 and the facing portions 36c and 136c of the width portions 36a of the power receiving coils 36u, 36v and 36w. Protrusions may be provided that protrude toward the power receiving coils 36u, 36v, and 36w from the opposing positions and support the power receiving coils 36u, 36v, and 36w. As a result, the protrusions can receive heat from between the divided cores 60 while supporting the receiving coils 36u, 36v, and 36w. Therefore, the number of heat-receiving locations can be increased while securing the space for the core 60 .

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

- The concave portions of the covers 50 and 150 may be provided in portions that cover the cover facing portions 36d and 136d of the power receiving coils 36u, 36v and 36w. At this time, it is desirable that the recess dimensions of the recesses correspond to the distances from the reference position R to the cover facing portions 36d and 136d of the receiving coils 36u, 36v and 36w. As a result, even if the thermal resistance is not uniform, variations in thermal resistance can be suppressed.

- A plurality of cores 60 may be divided into groups of a plurality of cores, and each group may be fixed to the cooling main body 42 with a holder. For example, two cores 60 may be collectively fixed in the left-right direction with a holder. Also, two cores 60 each in the row direction (in the front-rear direction) may be collectively fixed with a holder. The number of fixing points can be reduced by dividing each group into a plurality of groups and fixing them with holders.

- The power transmitting device 20 may be multiphase (specifically, three-phase) like the power receiving device 30 of the first and second embodiments. When the power transmitting device 20 side is multiphase, it is desirable to use the configuration of the power receiving 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 should be the top, and the power transmission coil 26, the bobbin 38, the pedestals 45 and 145, the core 60, and the cooling surface 41 should 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 may be 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 arranged on the side away from the cooling unit 40 and the cooling surface 41 due to its arrangement. In some cases, the power transmission coil 26 arranged on the far side does 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 portion 40 without interposing the other power transmission coil 26 , and a pedestal is provided so as to fill the space between each facing portion and the cooling portion 40 . The portions 45 and 145 have an uneven shape. As a result, the power transmission coil 26 and the cooling section 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 section 40 via the pedestals 45 and 145 . Therefore, even the multiphase power transmission coils 26 arranged in layers can be efficiently cooled by the cooling unit 40 .

The separation distances from the opposing portions of the power transmission coils 26 to the cooling surface 41 of the cooling unit 40 are different, and the projections 45a, 45b, 45c, and 145a of the pedestals 45 and 145 have different projecting dimensions according to the separation distances. , 145b and 145c are provided. Accordingly, different distances can be maintained by the projections 45a, 45b, 45c, 145a, 145b, and 145c of the pedestal 45, and the power transmission coils 26 can be stacked.

The width portion of the power transmission coil 26 is an effective area that contributes to power feeding, while the connecting portion extending in the extending direction of the road is a portion that does not contribute to power feeding so much. Therefore, by contacting the pedestals 45, 45 at the connecting portion, it is possible to efficiently transmit and receive power even during running, and to ensure necessary heat conductivity.

When three-phase coils are stacked with a predetermined electrical angle offset, if the U-phase power transmission coil 26u positioned between the two coils in terms of electrical angle is the farthest from the cooling surface 41 in the stacking direction, Heat cannot be transferred to the cooling unit 40 because the connection part overlaps with another power transmission coil 26 . Therefore, the coil located in the middle of the two coils in terms of electrical angle is arranged in the position closest to or in the middle of the cooling surface 41 in the stacking direction. As a result, the insulating portions of the coils of all phases can be in thermal contact with the cooling portion 40 via the pedestal portion 45 at the connection portion, and necessary heat transferability can be ensured.

A core 60 divided in the surface direction is arranged on the cooling surface. The power transmission coil 26 is in contact with a protruding portion that protrudes from a position facing the facing portion of the power transmission coil 26 between the divided cores 60 . As a result, the projecting portion can receive heat from between the divided cores 60 while supporting the power transmission coil 26 . Therefore, the number of heat-receiving locations can be increased while securing the space for the core 60 .

DESCRIPTION OF SYMBOLS 10... Non-contact electric power feeding system, 20... Power transmission apparatus, 26... Power transmission coil, 30... Power receiving apparatus, 36... Power receiving coil, 40... Cooling part, 41... Cooling surface, 45... Base part.

Claims (10)

In a power receiving device (30) of a non-contact power supply system (10) for non-contact power feeding between a power transmitting device (20) buried in the ground and a power receiving device (30) provided on the vehicle side ,
a plurality of receiving coils (36u, 36v, 36w);
a cooling unit (40) that cools the power receiving coil by having a cooling surface (41) that transfers heat from the power receiving coil;
a pedestal (45, 145) provided between each of the power receiving coils and the cooling surface of the cooling unit and fixing each of the power receiving coils on the cooling surface;
The plurality of power receiving coils are stacked on the cooling surface and arranged at predetermined intervals in an orthogonal direction perpendicular to the stacking direction, so that each power receiving coil is interposed with another power receiving coil. A facing portion (36c) facing the cooling surface of the cooling portion is provided,
The power receiving device, wherein the pedestal portion has an uneven shape so as to fill a space between the facing portion of each of the power receiving coils and the cooling surface of the cooling portion. a distance in the stacking direction from the facing portion of each of the power receiving coils to the cooling surface of the cooling unit is different for each of the power receiving coils,
2. The power receiving device according to claim 1, wherein the pedestal has projections (45a to 45c, 145a to 145c) with different projecting dimensions depending on the separation distance. The power receiving coil is a planar coil wound in a rectangular shape, and has a width portion (36a) extending in a width direction orthogonal to the longitudinal direction of the vehicle and a connecting portion (36b) connecting the width portion (36a). cage,
The power receiving device according to claim 1 or 2, wherein the pedestal portion is provided between the connecting portion of the power receiving coil and the cooling surface. The receiving coil is a three-phase coil consisting of a U-phase, a V-phase, and a W-phase, and is stacked by shifting a predetermined electrical angle,
4. The power receiving coil (36u) located in the middle in the electrical angle according to claim 3, wherein the power receiving coil (36u) is arranged in the lamination direction closest to the cooling surface or in the middle position in the lamination direction of the three-phase coils. Powered device. A core (60) that serves as an iron core of the receiving coil is arranged on the cooling surface, and the core is divided in the surface direction on the cooling surface,
2. The cooling unit is provided with, as the pedestal, a protruding portion protruding toward the power receiving coil from a position between the divided cores and facing the facing portion of the power receiving coil. The power receiving device according to any one of claims 4 to 4. In a power transmission device (20) of a contactless power supply system (10) for contactlessly supplying power between a power transmission device (20) buried in a road and a power receiving device (30) provided on a vehicle side ,
a plurality of transmitting coils (26);
a cooling unit (40) that cools the power transmission coil by having a cooling surface (41) that transfers heat from the power transmission coil;
a pedestal (45) provided between each of the power transmission coils and the cooling surface of the cooling unit and fixing each of the power transmission coils on the cooling surface;
The plurality of power transmission coils are stacked on the cooling surface and arranged at predetermined intervals in an orthogonal direction perpendicular to the stacking direction, so that each power transmission coil is interposed with another power transmission coil. A facing portion (36c) facing the cooling surface of the cooling portion is provided,
a distance in the stacking direction from the facing portion of each power transmission coil to the cooling surface of the cooling unit is different for each power transmission coil,
The pedestal portion has an uneven shape so as to fill the gap between the facing portion of each power transmission coil and the cooling surface of the cooling portion, and convex portions (45a to 45c, 145a-145c) . The power transmission coil is a planar coil 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 portion,
The power transmission device according to claim 6 , wherein the pedestal portion is provided between the connecting portion of the power transmission coil and the cooling surface. The power transmission coil is a three-phase coil consisting of a U-phase, a V-phase, and a W-phase, and is stacked by shifting a predetermined electrical angle,
8. The power transmitting device according to claim 7 , wherein the coil located in the middle of the electrical angle is arranged at a position closest to the cooling surface in the stacking direction or a middle position in the stacking direction of the three-phase coils. A core (60) serving as an iron core of the power transmission coil is arranged on the cooling surface, and the core is divided on the cooling surface in its surface direction,
7. The cooling unit is provided with, as the pedestal, a protruding portion protruding toward the power transmission coil from a position facing the facing portion of the power transmission coil between the divided cores. 9. The power transmitting device according to any one of claims 8 to 10. In a power transmission device (20) of a contactless power supply system (10) for contactlessly supplying power between a power transmission device (20) buried in a road and a power receiving device (30) provided on a vehicle side ,
a plurality of transmitting coils (26);
a cooling unit (40) that cools the power transmission coil by having a cooling surface (41) that transfers heat from the power transmission coil;
a pedestal (45) provided between each of the power transmission coils and the cooling surface of the cooling unit and fixing each of the power transmission coils on the cooling surface;
The plurality of power transmission coils are stacked on the cooling surface and arranged at predetermined intervals in an orthogonal direction perpendicular to the stacking direction, so that each power transmission coil is interposed with another power transmission coil. A facing portion (36c) facing the cooling surface of the cooling portion is provided,
The pedestal has an uneven shape so as to fill a gap between the facing portion of each power transmission coil and the cooling surface of the cooling unit,
A core (60) serving as an iron core of the power transmission coil is arranged on the cooling surface, and the core is divided on the cooling surface in its surface direction,
The power transmission device, wherein the cooling unit is provided with, as the pedestal, a protruding portion that protrudes toward the power transmission coil from a position between the divided cores and facing the facing portion of the power transmission coil.

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