JP5958266B2 - Non-contact power supply pad and non-contact charging system for forklift using the non-contact power supply pad - Google Patents

Description

  The present invention relates to a contactless power supply pad that generates or receives magnetic flux, in particular, a pad that performs power transfer by inductive power transfer (IPT), has a low profile and is substantially planar, and its The present invention relates to a non-contact charging system for a forklift using a non-contact power supply pad.

  An example of a pad provided with a contactless charging system using inductive power transfer (IPT) and a primary or secondary winding for inductive power transfer is disclosed in Patent Document 1. The power transmission pad disclosed in Patent Document 1 is mounted on an electric vehicle as a device that “picks up” electric power (that is, a secondary winding of a non-contact charging system), and “charging pad” (that is, The primary side winding is fixed to the garage floor. This power transmission pad is configured by arranging eight ferrite bars radially at equal intervals in a circular case made of aluminum, and forming a spiral coil so as to cross the center of the upper surface of each ferrite bar. The magnetic flux path is formed in each ferrite bar by the voltage applied to the coil. Specifically, the magnetic flux jumps upward from one end portion of the ferrite bar, propagates so as to enter perpendicularly to the other end portion of the ferrite bar through the upper surface of the pad. Therefore, it is considered that the magnetic flux path has a shape close to an ellipse including the coil. Note that magnetic flux does not pass through the rear surface of the pad because it is hindered by the aluminum circular case.

  In the above-described power transmission pad, actually, eight ferrite bars each give a magnetic flux pattern. At the highest position of each of these flux patterns, the flux lines are essentially horizontal. However, this horizontal magnetic flux is relatively close to the pad (extended to about one quarter of the pad diameter from the pad), and there is no horizontal magnetic flux at the very center of the pad (the highest magnetic flux density). The location is ideally the center of the pad, but in practice, the available horizontal flux component is zero). Therefore, unless the pickup is accurately positioned above the charging pad, power is not effectively guided to the pickup, and the relative position between the electric vehicle pickup and the ground charging pad must be precisely controlled. There was a problem. Since the power transmission pad disclosed in Patent Document 1 has a diameter of 400 mm and a thickness of about 25 mm, the charging pad and the pickup are usually set at an interval of 50 mm or less between the charging pad and the pickup. It was necessary to arrange it perfectly.

  An example of a power transmission pad that solves such a problem is disclosed in Patent Document 2. The pad disclosed in Patent Document 2 is configured by setting a magnetic pole region at each end of a magnetically permeable magnetic core and winding a coil in a spiral shape around each magnetic pole region. . By forming the coil in this way, the magnetic flux that enters the pad from one magnetic pole region is transmitted to the other magnetic pole region through the magnetic core, and then leaves the pad from the other magnetic pole region and passes through the air. To one of the magnetic pole regions. The magnetic flux path thus formed is essentially above the front surface of the pad and forms a looped arch in space beyond the front surface of the pad. For this reason, it provides a significant horizontal magnetic flux component at a significant distance above the front of the pad, even if the vertical position of the electric vehicle pickup with respect to the charging pad on the ground is slightly out of position and also in the lateral position. Even if there is some deviation, power can be supplied effectively.

  Patent Document 3 discloses a contactless charging system that charges a forklift battery in a contactless manner. In the non-contact charging system disclosed in Patent Document 3, a magnetic field is generated by applying an AC voltage from an AC power source to a coiled wire laid below a floor surface at a predetermined position, and the magnetic field is generated at the lower part of the lower part of the vehicle body. When the driver drives the forklift so that the core winding projecting across the core crosses, an induction voltage (AC voltage) is induced in the core winding, and the induction voltage is rectified by a rectifier to become a DC voltage. Charge the battery.

International Publication No. 2008/140333 International Publication No. 2010/090539 JP-A-6-86470 (FIG. 3)

  However, since the power transmission pad disclosed in Patent Document 2 is configured by winding a coil in a spiral shape around each magnetic pole region, the planar spread of the pad is large. Outer dimensions increase. Therefore, a large space is required to attach the pad. For this reason, if the pad disclosed in Patent Document 2 is used in a non-contact charging system for a forklift, the forklift has a smaller space in which the pad can be attached as compared to a general electric vehicle, and therefore the outer dimensions of the pad are increased. However, there is a problem that it is difficult to attach the pad to the forklift because the place where the pad is attached is increasingly restricted. Further, when the coil is wound in a horizontal row on the upper surface of the magnetic material, one end of the coil needs to be pulled out from the back side of the magnetic material, which makes it difficult to manufacture the pad.

  Accordingly, the present invention has an object to provide a non-contact power supply pad that can reduce the outer dimensions and can be easily manufactured, and a non-contact charging system for a forklift that uses the non-contact power supply pad. It is.

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention includes a flat plate-like magnetic body in which magnetic pole regions are respectively set at both ends, and around each magnetic pole region of the magnetic material. And a coil wound spirally from the outside of the end of the magnetic body over the upper surface of the main body of the magnetic body, and each of the coils has one plane in plan view on the upper surface of the main body of the magnetic body. wound on the at the end outer side of the magnetic body wound in two stages vertically, the two said coils, so that the magnetic flux path through the upper portion of the magnetic to the other is formed from one of the magnetic pole region A voltage is applied.

  According to the above configuration, each coil is wound in two steps up and down outside the end portion of the magnetic body, so that it is planar compared to the pad in which the coils are wound in a horizontal row disclosed in Patent Document 2. Dimensions can be shortened. In addition, since the coil outside the end portion approaches the magnetic body, the magnetomotive force of the magnetic body is increased and the performance is improved. Further, since the coil passes outside the end of the magnetic body, it is not necessary to pull out one end of the coil from the back side of the magnetic body, and the pad can be easily manufactured.

The invention according to claim 2 is the invention according to claim 1, wherein each of the coils is first formed in the magnetic pole region of the magnetic material from the inside to the outside, and below the top surface of the magnetic material. after rolling over from the outer end to the upper surface of the main body portion of the magnetic body, over the upper surface of the main body portion of the magnetic body from the outside of the end of the magnetic body above the upper surface of the magnetic It is characterized by being wound from the inside to the outside in a plane.

  According to the above winding method, it is possible to wind the coil in a single plane on the top surface of the main body of the magnetic body and to wind in two stages up and down outside the end of the magnetic body. Furthermore, since the coil passes above the upper surface of the magnetic body and then passes above the end of the magnetic body, the pad can be easily manufactured.

  The invention according to claim 3 is the invention according to claim 1, wherein each of the coils is first formed in the magnetic pole region of the magnetic body from the outside to the inside, and above the upper surface of the magnetic body. The outer end of the magnetic body is planarly wound over the upper surface of the main body portion of the magnetic body, and when reaching the end of the magnetic body, descends downward, and the end of the magnetic body below the upper surface of the magnetic body Is wound from the inside to the outside over the upper surface of the main body of the magnetic body.

  According to the above winding method, it is possible to wind the coil in a single plane on the top surface of the main body of the magnetic body and to wind in two stages up and down outside the end of the magnetic body. Furthermore, since it is possible to reliably make the overlapping of the coils doubly or less, the thickness of the pad can be reduced.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the second magnetic field in contact with the magnetic body is in a magnetic pole region set in the magnetic body. It is characterized by providing a body.

  According to the above configuration, by providing the second magnetic body in the magnetic pole region, the magnetomotive force of the magnetic body is further increased and the performance is improved.

The invention according to claim 5 is the invention according to claim 4 , wherein the dimension of the magnetic pole region of the second magnetic body in the major axis direction of the magnetic body is equal to the major axis dimension of the magnetic body. It is characterized by being 1/4 or less.

  According to the above configuration, the dimension of the upper surface of the magnetic body excluding the magnetic pole region is ensured to be 1/2 of the major axis dimension of the magnetic body, and a space for winding each coil over the upper surface of the main body of the magnetic body is secured. it can.

  According to a sixth aspect of the present invention, there is provided a primary-side non-contact power supply pad connected to an AC power source, a secondary-side non-contact power supply pad disposed on a forklift equipped with a battery, A rectifier disposed on a forklift and configured to rectify a voltage sent from the secondary-side non-contact power supply pad, wherein the primary-side and secondary-side non-contact power supply pads include: The contactless power supply pad according to any one of? 5, wherein power is supplied in a noncontact manner from the primary contactless power supply pad to the secondary contactless power supply pad, The battery mounted on the forklift is charged.

  According to the above configuration, the planar dimensions of the primary-side and secondary-side non-contact power supply pads can be reduced as compared with the pad disclosed in Patent Document 2. Therefore, the degree of freedom of the position at which the secondary-side non-contact power supply pad is disposed on the forklift is improved, so that the pad can be easily attached to the forklift. Furthermore, compared with the pad disclosed in Patent Document 2, the magnetomotive force of the magnetic material of the non-contact power supply pad on the primary side and the secondary side is increased, and the performance is improved.

  The invention according to claim 7 is the invention according to claim 6, further comprising a support base on which a wheel mounted on one side of the forklift can be mounted, wherein the primary side The non-contact power supply pad is provided on the support base, and the secondary power supply power can be received from the lower side of the one side portion of the forklift so that the power supplied by the primary non-contact power supply pad can be received. The non-contact power supply pad on the side is provided on the lower surface or the lower portion of the one side portion of the forklift.

  According to the above configuration, it is not necessary to embed the primary-side non-contact power supply pad in the ground, so that the primary-side non-contact power supply pad can be easily laid, and the time and cost for the laying can be reduced. It can be shown. Further, even if the target for attaching the secondary-side non-contact power supply pad is an existing forklift, the secondary-side non-contact power supply pad may be disposed on the lower surface or lower part of one side of the forklift. Compared with the case where the secondary non-contact power supply pad provided on the lower surface or the lower portion of the vehicle body is disposed on the center line of the vehicle body (the center in the width direction of the vehicle body), Installation and maintenance are easy.

  The invention according to claim 8 is the invention according to claim 6, wherein the primary non-contact power supply pad is disposed so as to face a side surface of the forklift, The secondary side non-contact power supply pad is provided on one side or side surface of the forklift so that the power supplied from the primary side non-contact power supply pad can be received. To do.

  According to the above configuration, the attachment and maintenance of the secondary-side non-contact power feeding pad are facilitated as compared to the case where the secondary-side non-contact power feeding pad is disposed on the lower surface or the lower part of the forklift.

  The invention described in claim 9 is the invention described in claim 6, wherein the primary non-contact power supply pad is disposed so as to be able to face the seat rear surface of the forklift, and the rear of the forklift The secondary non-contact power supply pad is provided behind the seat of the forklift so that the power supplied from the primary non-contact power supply pad can be received. is there.

  According to the above configuration, the attachment and maintenance of the secondary-side non-contact power feeding pad are facilitated as compared to the case where the secondary-side non-contact power feeding pad is disposed on the lower surface or the lower part of the forklift.

  The invention according to claim 10 is the invention according to claim 6, wherein the primary non-contact power supply pad is disposed so as to be able to face the top surface of the head guard of the forklift, The secondary side non-contact power feeding pad is provided on the head guard of the forklift so that the power supplied from the upper side by the primary side non-contact power feeding pad can be received. is there.

  According to the above configuration, the attachment and maintenance of the secondary-side non-contact power feeding pad are facilitated as compared to the case where the secondary-side non-contact power feeding pad is disposed on the lower surface or the lower part of the forklift.

  The non-contact power supply pad of the present invention can shorten the planar dimension compared to a pad wound in a horizontal row by winding each coil in two upper and lower stages outside the end of the magnetic body, Therefore, the space for attaching the pad can be reduced, and the coil outside the end approaches the magnetic body, so that the magnetomotive force of the magnetic body becomes stronger, the performance can be improved, and the coil passes outside the end of the magnetic body. By doing so, there is no need to pull out one end of the coil from the back side of the magnetic material, and the pad can be easily manufactured.

  Further, the non-contact charging system for forklifts using the non-contact power feeding pad according to the present invention has a planar view of the non-contact power feeding pads on the primary side and the secondary side as compared with a pad in which coils are wound in a horizontal row. The size can be reduced, the pad can be easily attached to the forklift, and the magnetomotive force of the magnetic material of the non-contact power supply pad on the primary side and the secondary side is increased, thereby improving the performance. ing.

It is a top view of the pad for non-contact electric power feeding in an embodiment of the invention. It is side surface sectional drawing of the pad for the non-contact electric power feeding. It is a connection diagram of the non-contact power supply pad. It is explanatory drawing which shows the magnetic flux path | route of the non-contact electric power feeding pad. It is a top view of the modification of the pad for non-contact electric power feeding in an embodiment of the invention. It is side surface sectional drawing of the pad for the non-contact electric power feeding. It is a perspective view which shows the principal part of the non-contact charging system in embodiment of this invention. It is a side view which shows the principal part of the non-contact charging system. It is side surface sectional drawing which shows an example of the support stand of the non-contact charging system. It is a perspective view which shows the modification of the non-contact charge system in embodiment of this invention. It is a perspective view which shows the other modification of the non-contact charging system in embodiment of this invention. It is a perspective view which shows the other modification of the non-contact charging system in embodiment of this invention. It is a partially expanded perspective view which shows the modification of the support stand of the non-contact charging system in embodiment of this invention. It is a perspective view which shows the other examples of the non-contact charge system in embodiment of this invention. It is a perspective view which shows the other examples of the non-contact charge system in embodiment of this invention. It is a perspective view which shows the other examples of the non-contact charge system in embodiment of this invention. It is a perspective view which shows the other examples of the non-contact charge system in embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, duplicate description is omitted by assigning the same reference numerals to the same components. In addition, the drawings schematically show each component for easy understanding. In addition, the shape of each component shown by the following embodiment, the numerical value of a dimension, etc. are examples, and are not specifically limited, A various change is possible in the range which does not deviate substantially from the effect of this invention. It is. The combinations of the constituent elements shown in the following embodiments are merely examples, and are not particularly limited, and can be appropriately combined without departing from the effects of the present invention.

  FIG. 1 is a plan view of a contactless power supply pad according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and as shown in FIGS. A long plate-like (slip-shaped) first ferrite (an example of a magnetic body) 14 having magnetic pole regions 12 and 13 respectively set at both ends, and these magnetic pole regions 12 and 13 respectively at both ends of the first ferrite 14 In addition, a plate-like second ferrite (an example of a second magnetic body) 15 provided in contact with the upper surface of the first ferrite 14 and around the magnetic pole regions 12 and 13 of the first ferrite 14, respectively. Coils 16, 17 wound spirally (spirally) from the outside of the end of the first ferrite 14 over the upper surface of the main body of the first ferrite 14, the first ferrite 14, the second ferrite 15, and the coil 16, 17 A thin dish-like back plate 18 made of a magnetic non-permeable member such as plastic is supported, and the back plate 18 is filled with a resin 19 except for the front surface (upper surface) of the second ferrite 15. The first ferrite 14, the second ferrite 15, and the coils 16 and 17 are fixed to the back plate 18. Both end portions of each of the coils 16 and 17 are drawn out to the outside of the back plate 18, and terminals 20 are attached.

  The dimension of the second ferrite 15 in the major axis direction of the first ferrite 14 (dimension in the width direction of the second ferrite) is set to be equal to or smaller than ¼ of the major axis dimension of the first ferrite 14. The height dimension (thickness) is set according to the thickness of the conducting wires 16a and 17a forming the coils 16 and 17. Further, the depth of the back plate 18 is substantially set to the dimension of the coil 16 or 17 in the depth direction of the back plate 18 (the width direction of the first ferrite 14 or the long axis direction of the second ferrite 15). The dimension is set to be equal to or larger than the dimension obtained by adding the dimensions of the coil 16 and the coil 17 in the lateral width direction (the long axis direction of the first ferrite 14 or the width direction of the second ferrite 15). For example, when the dimension D1 of the coil 16 or 17 in the width direction of the first ferrite 14 is 100 mm, the depth of the back plate 18 is set to about 100 mm, and the coil 16 and the coil 17 in the major axis direction of the first ferrite 14 are set. When both dimensions D2 are 150 mm, the lateral width of the back plate 18 is set to 300 mm or more. The lateral width of the back plate 18 varies depending on the dimension S of the gap between the coil 16 and the coil 17. The dimension S of the gap between the coil 16 and the coil 17 is a distance from the front surface of the non-contact power supply pad 11 that can provide a significant horizontal magnetic flux component under a constant number of turns of the coil 16 and the coil 17 (power supply range or power supply). This is one of the factors that determine the distance), and the power supply range (or power supply distance) increases as the dimension S increases. Therefore, when the two contactless power supply pads 11 are arranged at positions away from each other and power is supplied, it is preferable to widen the gap between the coil 16 and the coil 17.

  As shown in FIG. 2, each of the coils 16 and 17 is wound in a single plane on the upper surface of the main body portion of the first ferrite 14, and two steps up and down outside the end of the first ferrite 14. It is wound around. The number of windings is eight.

Specifically, the coils 16 and 17 are wound as follows.
(1) First, the coils 16 and 17 are moved outwardly from the inner side to the outer side of the magnetic pole regions 12 and 13, respectively, outward of the side surface of the first ferrite 14 (outward of the end of the first ferrite 14 below the upper surface of the first ferrite 14). ) To the upper surface of the main body of the first ferrite 14. No. 1-No. 4 conductors 16a and 17a.
(2) When each coil 16, 17 is wound a predetermined number of times, Five conductive wires 16 a and 17 a are wound around the side surface of the second ferrite 15 from the upper surface of the main body portion of the first ferrite 14.
(3) Subsequently, the coils 16 and 17 are respectively connected from the outside of the side surface of the second ferrite 15 (outside the end of the first ferrite 14 above the top surface of the first ferrite 14) to the main body portion of the first ferrite 14 It is wound from the inside to the outside in a plane over the upper surface of the. No. 5-No. This corresponds to the eight conducting wires 16a and 17a.

  Thereby, since the coils 16 and 17 pass outside the ends of the first ferrite 14 and the second ferrite 15, it is not necessary to pull out one end of each of the coils 16 and 17 from the back side of the first ferrite 14. Both ends of the coils 16 and 17 can be easily pulled out from the back plate 18. Therefore, the non-contact power supply pad 11 can be easily manufactured. In addition, after the coils 16 and 17 have passed through the outer end of the first ferrite 14 located below the second ferrite 15, the outer end of the second ferrite 15 located above the first ferrite 14 is coiled. Since 16 and 17 pass, manufacture of pad 11 for non-contact electric power feeding becomes easy.

  The non-contact power supply pad 11 is portable and can be arranged two-dimensionally rather than normally three-dimensionally. For example, it can be used for non-contact charging of a forklift. In this case, as shown in FIG. 3, one pad 11 is connected to the high frequency power supply device 21 as a charging pad, and the other pad 11 is provided as a pickup on the forklift to charge the battery 22 mounted on the forklift. Connected to the charger 23.

In the non-contact power supply pad 11 used as the charging pad, a high frequency voltage is applied to the two coils 16 and 17 from the high frequency power supply device 21 connected to the commercial power source 24 (for example, AC 200 V), and as shown in FIG. In addition, the magnetic flux exits from the one magnetic pole region 12, 13 (one second ferrite 15) through the inside of the first ferrite 14 and out of the other magnetic pole region 13, 12 (the other second ferrite 15). A magnetic flux path 25 is formed to reach one of the magnetic pole regions 12 and 13, that is, an arch-shaped magnetic flux path 25 is formed above the contactless power supply pad 11, A significant horizontal flux component is provided for the distance. Note that a magnetic flux path is essentially not formed on the back side of the pad 11.
Therefore, when the non-contact power supply pad 11 used as a pickup is arranged in the arch-shaped magnetic flux path 25, even if the non-contact power supply pad 11 used as a charge pad is displaced in the vertical direction, In addition, even if they are shifted laterally, an induction voltage (high frequency voltage) is induced in the two coils 16 and 17, and the battery 22 of the forklift is charged by the charger 23. For example, as shown in FIG. 3B, a resonant capacitor 26 that resonates at the frequency of the high frequency voltage together with the coils 16 and 17 is connected to both ends of two coils 16 and 17 connected in parallel. A circuit for charging the battery 22 may be configured by connecting the charger 23 to both ends of the battery 26. The charger 23 includes at least a rectifier, and rectifies the induced voltage (high-frequency voltage) to generate a DC voltage (for example, DC 300 V), and charges the battery 22.

FIG. 3A shows a circuit configuration in which the two coils 16 and 17 are directly connected to the high frequency power supply device 21, but between the two coils 16 and 17 and the high frequency power supply device 21. A resonance capacitor that resonates at the frequency of the high frequency voltage may be connected to the coils 16 and 17. In this case, a resonance capacitor may be connected in parallel to the coils 16 and 17 to form a parallel resonance circuit, or a series resonance circuit may be connected in series.
FIG. 3B shows a circuit configuration in which one resonance capacitor 26 is connected in parallel to both ends of the two coils 16 and 17. A series resonance circuit may be configured by connecting the capacitors 26 in series.
FIG. 3A shows a circuit configuration in which two coils 16 and 17 are connected in series, and FIG. 3B shows a circuit configuration in which two coils 16 and 17 are connected in parallel. However, in the contactless power supply pad 11 used as a charging pad, the two coils 16 and 17 may be connected in parallel, or in the contactless power supply pad 11 used as a pickup, the two coils 16 are connected. , 17 may be connected in series.

  As described above, according to the present embodiment, each of the coils 16 and 17 is wound in two upper and lower stages outside the end of the first ferrite 14, so that the coils are wound in a horizontal row as in Patent Document 2. Compared with the pad, the planar dimension of the pad (the external dimension of the pad) can be shortened. Therefore, it becomes easy to attach the pad to a forklift (especially an existing forklift). Further, the coils 16 and 17 outside the ends approach the ferrites 14 and 15, and the magnetomotive force of the ferrites 14 and 15 becomes strong, so that the performance can be improved. Furthermore, since the coils 16 and 17 pass outside the ends of the ferrites 14 and 15, it is not necessary to pull out one end of each of the coils 16 and 17 from the back side of the lower ferrite 14, and the pad can be easily manufactured. It becomes.

  Further, according to the present embodiment, the second ferrite 15 positioned above the first ferrite 14 after the coils 16, 17 have passed the outside of the end portion of the first ferrite 14 positioned below the second ferrite 15. Since the coils 16 and 17 pass outside the end of the pad, the pad can be easily manufactured.

  Further, according to the present embodiment, since the second ferrite 15 in contact with the first ferrite 14 is provided in each of the magnetic pole regions 12 and 13, the coils 16 and 17 can be easily wound, workability can be improved, and pads can be manufactured. Further, the magnetomotive force of the ferrites 14 and 15 becomes stronger, and the performance can be improved.

  In addition, according to the present embodiment, the dimension of each magnetic pole region 12, 13 in the major axis direction of the first ferrite 14 is set to ¼ or less of the major axis dimension of the first ferrite 14. As a dimension of the upper surface of the first ferrite 14 excluding the first ferrite 14, 1/2 of the major axis dimension of the first ferrite 14 is secured, and a space for winding the coils 16 and 17 over the upper surface of the main body of the first ferrite 14 is secured. It can be secured.

In the present embodiment, the back plate 18 provided on the back side of the first ferrite 14 is formed of a magnetic non-permeable member such as plastic, but may be a member made of aluminum. The aluminum back plate can prevent small-scale leakage magnetic flux when the first ferrite 14 has defects or defects.
In the present embodiment, the number of windings of each of the coils 16 and 17 is eight, but the number is not limited to eight. Each coil 16 and 17 has two stages outside the end of the first ferrite 14, but it is also possible to have more stages, three stages, and four stages. However, in order to reduce the thickness of the contactless power supply pad 11, two steps are preferable.
In the present embodiment, the second ferrite 15 is fixed to each of the magnetic pole regions 12 and 13, but the function as the contactless power feeding pad 11 can be achieved without the second ferrite 15.
In this embodiment, the coils 16 and 17 are formed by two conductive wires. However, when the coils 16 and 17 are connected in series, the coils 16 and 17 may be formed by a single conductive wire. .

Moreover, the winding method of the coils 16 and 17 is not limited to the winding method shown in FIG. 1 and FIG. 2, For example, you may employ | adopt the winding method shown in FIG. 5 and FIG. Hereinafter, another example of how to wind the coils 16 and 17 will be described with reference to FIGS. 5 and 6. FIG. 5 is a plan view of a modification of the contactless power feeding pad according to the embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along the line AA of FIG.
(1) First, each of the coils 16 and 17 is placed on the side surface of the second ferrite 15 from the outside to the inside, outward of the end of the second ferrite 15 (on the end of the first ferrite 14 above the upper surface of the first ferrite 14). Wind outwardly from the top to the top surface of the first ferrite 14. No. 1-No. 4 conductors 16a and 17a.
(2) No. wound inside. When the four conducting wires 16 a and 17 a reach the end of the second ferrite 15 (the end of the first ferrite 14), the lead wires 16 a and 17 a are lowered to the side surface of the first ferrite 14 positioned below the second ferrite 15.
(3) Subsequently, each of the coils 16 and 17 is located below the second ferrite 15 (below the upper surface of the first ferrite 14) and from the outside of the side surface (end) of the first ferrite 14. Wrap from the inside to the outside over the top surface of the body. No. 5-No. This corresponds to the eight conducting wires 16a and 17a.

  Accordingly, since the coils 16 and 17 pass outside the ends of the ferrites 14 and 15, it is not necessary to pull out one end of each of the coils 16 and 17 from the back side of the first ferrite 14. It becomes easy to pull out both ends from the back plate 18. Therefore, the pad can be easily manufactured. In addition, since the overlap of the coils 16 and 17 can be reliably reduced to two or less, the height of the back plate 18 is added to the thickness of the first ferrite 14 and the thickness of the second ferrite 15. The size can be set approximately and the height of the back plate 18 can be reduced. Thereby, the thickness of the non-contact power supply pad 11 can be reduced, and the non-contact power supply pad 11 can be formed into a thinner flat plate shape. Therefore, the non-contact power supply pad 11 can be easily attached.

  Next, a non-contact charging system for forklifts using the above-described non-contact power feeding pad 11 will be described. The non-contact charging system described below is for charging a battery (lead storage battery) mounted on an existing counterbalance type electric forklift (battery vehicle).

FIG. 7 is a perspective view for explaining the overall configuration of the contactless charging system according to the embodiment of the present invention, and FIG. 8 is a side view for explaining the overall configuration of the contactless charging system according to the embodiment of the present invention. is there.
The non-contact charging system shown in FIGS. 7 and 8 includes a primary non-contact power supply pad (charging pad) 11 a connected to a high-frequency power supply device (an example of an AC power source) (not shown) and a battery (lead storage battery) 31. And a non-contact power supply pad (pickup) 11b on the secondary side disposed on the forklift 33 on which the charger 32 for charging the battery 31 is mounted, and a non-contact on the secondary side disposed on the forklift 33. A rectifier 34 that rectifies the high-frequency voltage sent from the power supply pad 11b and sends it to the charger 32, and the primary-side non-contact power supply pad 11a and the secondary-side non-contact power supply pad 11b include: The non-contact power supply pad 11 described above is configured to supply power in a non-contact manner from the primary-side non-contact power supply pad 11a to the secondary-side non-contact power supply pad 11b. To charge the battery 31, which is mounted on.

  Further, this non-contact charging system is installed on the ground and can be loaded with wheels (front wheel 35a and rear wheel 35b) mounted on one side of the forklift 33. The primary-side non-contact power supply pad 11a is provided on the support base 36, and the primary-side non-contact power supply pad 11a from the support base 36 (below one side portion of the forklift 33) is provided. A secondary-side non-contact power supply pad 11 b is provided on the lower surface or lower part of one side of the forklift 33 so that the supplied power can be received.

  For example, as shown in FIG. 3A, the primary non-contact power supply pad 11a used as the charging pad has a high frequency voltage applied to the two coils 16 and 17 from the high frequency power supply device 21 connected to the commercial power source 24. Applied. On the other hand, the non-contact power supply pad 11b on the secondary side used as a pickup is connected to a rectifier 34 as shown in FIG.

  The existing forklift 33 is equipped with a connector into which a plug provided at the tip of a cable connected to a commercial power source is manually inserted, and the connector is connected to the charger 32. The charger 32 includes at least a rectifier, and rectifies an AC voltage (for example, AC 200 V) supplied from a commercial power supply to the connector via a cable to generate a DC voltage (for example, DC 300 V), and charges the battery 31. Therefore, in the present embodiment, the secondary side non-contact power supply pad 11 b is connected to the connector (not shown) provided in the forklift 33 via the rectifier 34. According to this configuration, when the non-contact power supply pad 11b on the secondary side is disposed in the arch-shaped magnetic flux path above the non-contact power supply pad 11a on the primary side, the secondary side An induction voltage (high-frequency voltage) is induced in the two coils 16 and 17 of the non-contact power supply pad 11b, and the induction voltage is rectified by the rectifier 34 to become a DC voltage (for example, DC 300V). Is supplied to a connector (not shown). The battery 31 of the forklift 33 is charged by the charger 32 mounted on the forklift 33. Note that the power receiving circuit including the secondary-side non-contact power supply pad 11b may have a configuration in which a rectifier 34 is added to the circuit configuration illustrated in FIG. In other words, a rectifier 34 may be connected between the resonant capacitor 26 and the charger 23 (corresponding to the charger 32 in FIG. 8).

  As shown in FIG. 7, the support base 36 has a flat upper surface 36 a and is configured to be long in the traveling direction of the forklift 33. The length of the upper surface 36a of the support base 36 is such that the front wheel 35a and the rear wheel 35b on one side of the forklift 33 can ride on the upper surface 36a simultaneously when the forklift 33 is stopped at a predetermined charging position. Make length. The wheelbase of existing electric forklifts is not constant. Therefore, the length of the upper surface 36a of the support base 36 is made to correspond to the wheel base of the forklift to be charged. Here, the non-contact power supply pad 11 described above is allowed because an induced voltage (high frequency voltage) is induced in the two coils 16 and 17 of the pickup even if the pickup and the charging pad are laterally displaced. The wheel base of the existing electric forklift can be divided into a plurality of groups according to the amount of lateral displacement, and the length of the upper surface 36a of the support base 36 can be determined for each group. Alternatively, the support base 36 is configured to connect a plurality of parts, and the upper surface 36a of the support base 36 is changed by changing the number of parts to be mounted on the ground in accordance with the wheel base of the forklift 33 to be charged. You may change the length. Also in this case, the number of parts constituting the support base 36 can be reduced by dividing the wheel base of the existing electric forklift into a plurality of groups in accordance with the above-described allowable lateral displacement. Or you may make the length of the upper surface 36a of the support stand 36 respond | correspond to the largest wheel base among the wheel bases of the existing electric forklift.

  The position at which the primary-side non-contact power supply pad 11a used as the charging pad is provided on the support base 36 may be determined by the distance from the front wheel 35a of the forklift 33, for example. In this way, when the front wheel 35a of the forklift 33 stops at a predetermined position, an induced voltage is induced by an alternating magnetic field generated from the primary non-contact power supply pad 11a provided on the support base 36. The non-contact power feeding pad 11b on the secondary side provided on the forklift 33 can be disposed at the position. The positioning of the front wheel 35a of the forklift 33 is, as described above, because an induced voltage (high frequency voltage) is induced in the two coils 16 and 17 of the pickup even if the pickup and the charging pad are displaced laterally. As shown, the driver may stop the forklift 33 with the stop line 37 as a mark.

The height H of the support base 36 depends on the thickness (height) of the contactless power supply pad 11a on the primary side. When only the front wheel 35a and the rear wheel 35b on one side of the forklift 33 ride on the support base 36, and the front and rear wheels mounted on the other side are supported on the ground, the forklift on the support base 36 Since 33 is inclined, the higher the height of the support base 36, the more unstable the state becomes. However, as described above, the contactless power supply pad 11 of the present embodiment can be made thinner. If the coils 16 and 17 are wound in two stages outside the end of the first ferrite 14, the thickness can be 2.5 cm. For this reason, the height H of the support base 36 can be about 40 mm, for example. Therefore, according to the present embodiment, instability of the forklift 33 in which one wheel rides on the support base 36 and is inclined can be reduced.
The width W of the support base 36 is equal to or greater than the width of the wheel 35 of the forklift 33, for example, 300 mm. However, as described above, the forklift 33 on the support base 36 is tilted, and therefore, it is necessary to make the width of the tilted forklift 33 below a width that does not contact the support base 36. Further, when the position of at least one of the inner surface and the outer surface of the front wheel 35a and the rear wheel 35b is shifted in the width direction of the vehicle body, the vehicle body between the outer surface on the outer side and the inner surface on the inner side. The width W of the support base 36 is set to be greater than the interval in the width direction.

  In addition, as shown in the figure, the support base 36 may be provided with slopes 36b at both ends in the traveling direction of the forklift 33 so that the forklift 33 can get on and off the support base 36 smoothly.

  The primary-side non-contact power supply pad 11 a is provided with a cover capable of withstanding the weight of the forklift 33 on the non-contact power supply pad 11 described above, and the upper surface of the cover is flush with the upper surface 36 a of the support base 36. As shown in FIG. 9, a concave portion 38 deeper than the thickness of the primary-side non-contact power supply pad 11a is formed in the support base 36, and the concave portion 38 is exposed. The primary non-contact power supply pad 11 a may be disposed therein, and a lid 39 capable of withstanding the weight of the forklift 33 may be provided on the upper surface of the recess 38. As the material for the cover and lid 39, a material having a small influence on the magnetic field (magnetic flux) generated from the primary-side non-contact power supply pad 11a is selected.

  Application of the high-frequency voltage to the primary non-contact power supply pad 11a is performed, for example, when the front wheel 35a and the rear wheel 35b on one side of the forklift 33 ride on the support base 36 and the front wheel 35a stops at a predetermined position. After that, the driver or the operator may start by operating a switch for instructing application of the high frequency voltage. As shown in FIG. It may be started by a signal generated from the load sensor 40 when the front wheel 35a passes over the load sensor 40.

  As described above, in the non-contact charging system according to the present embodiment, the primary side used as a charging pad on the support base 36 on which the front wheel 35a and the rear wheel 35b mounted on one side of the forklift 33 ride. A non-contact power supply pad 11 a is provided, and a secondary non-contact power supply pad 11 b used as a pickup is provided on the lower surface or lower part of one side of the forklift 33.

  On the other hand, in a general electric vehicle non-contact charging system in which power is transmitted in a non-contact manner from a charging pad fixed on the floor surface of a garage or the ground of a parking lot to a pickup provided on the lower surface of the vehicle body, A pickup is disposed on the center line of the vehicle body (the center in the width direction of the vehicle body). However, when the object to transmit power in a non-contact manner is a forklift, if the pickup provided on the lower surface of the body of the forklift is disposed on the center line of the body, the fork contacts the charging pad fixed to the ground, The charging pad may be damaged. In order to avoid this problem, it is necessary to bury the charging pad in the ground, and it takes time and cost to lay the charging pad. Furthermore, when the target for mounting the pickup is an existing forklift, the body of the forklift is heavier and stronger than a general electric vehicle, so the work of mounting the pickup provided on the lower surface of the body on the center line of the body is not It will be difficult.

  With respect to these problems, according to the present embodiment, it is not necessary to embed the primary-side non-contact power supply pad (charging pad) 11a in the ground, so the primary-side non-contact power supply pad 11a Laying becomes easy, and the time and cost for the laying can be reduced. Further, even if the target for attaching the secondary side non-contact power supply pad (pickup) 11 b is an existing forklift 33, the secondary side noncontact power supply pad 11 b is attached to the lower surface or lower part of one side of the forklift 33. Therefore, the secondary-side non-contact power supply pad 11b provided on the lower surface or the lower part of the vehicle body may be disposed on the center line of the vehicle body, compared to the secondary-side non-contact power supply pad 11b. Is easy to install and maintain. In addition, the support base 36 can also function as a guide portion that guides the forklift 33 to a predetermined charging position, and guides the forklift 33 to a place different from the charging pad as in a general non-contact charging system of an electric vehicle. It is not necessary to provide a part, and the labor and cost required for laying the primary side of the non-contact charging system can be reduced.

  Further, according to the present embodiment, the forklift 33 is inclined with one wheel riding on the support base 36, so that the center of gravity of the forklift 33 moves. Therefore, the pressure received by the support base 36 from the forklift 33 can be reduced.

In the present embodiment, the case where the driver stops the forklift 33 with the stop line 37 as a mark has been described. However, for example, as shown in FIG. The positioning of the front wheel 35a may be realized. Further, in this case, as shown in FIG. 11, a load sensor 40 is provided on the wheel stopper 41, and a signal generated from the load sensor 40 when the front wheel 35a of the forklift 33 abuts against the wheel stopper 41 causes a primary side. Application of a high-frequency voltage to the contactless power supply pad 11a may be started.
In the present embodiment, the case where only the support base 36 on which the wheels (the front wheels 35a and the rear wheels 35b) mounted on one side of the forklift 33 can be mounted is described on the ground. As described above, in this case, the forklift 33 is inclined and becomes unstable. Therefore, as shown in FIG. 12, a support base 42 on which a wheel mounted on the other side of the forklift 33 can be mounted may be further installed on the ground so that the forklift 33 does not tilt. The support base 42 need not be provided with a primary-side non-contact power supply pad.

  Subsequently, a modified example of the support base 36 will be described. FIG. 13 shows a modification of the support base 36. As shown in FIGS. 13A to 13C, the support base 36 may have a wider end portion on the side where the forklift 33 rides. This makes it easy to place the rear wheel 35b of the forklift 33 on the support table 36 even when the forklift 33 rides on the support table 36 while turning. Further, as shown in FIG. 13 (a), if the slope 36c is provided also on the side surface of the end portion where the width is widened, the rear wheel 35b of the forklift 33 can be placed on the support base 36 more easily. become.

  Next, another example of the non-contact charging system for forklifts using the non-contact power supply pad will be described. In the above non-contact charging system, power is supplied to the forklift 33 from the lower side of the vehicle body without contact. However, as shown in FIG. 14, the secondary-side non-contact power supply pad 11b is arranged on one side or side surface of the vehicle body. It is possible to supply power to the forklift 33 from one side of the vehicle body in a non-contact manner. As shown in FIG. 15, a secondary non-contact power supply pad is provided behind the seat 33 a of the forklift 33. 11b may be provided so that power is supplied to the forklift 33 from the rear of the vehicle body in a non-contact manner, or as shown in FIG. 16, a secondary non-contact power supply pad 11b is provided on the head guard 33b of the forklift 33. The forklift 33 may be powered without contact from above the vehicle body.

  When power is supplied to the forklift 33 from one side of the vehicle body in a non-contact manner, the primary non-contact power supply pad 11 a is disposed so as to face the side surface of the forklift 33. For example, as shown in FIG. 14, the support member 44 fixed to the pillar 43 and projecting in the horizontal direction has the same height as the secondary non-contact power supply pad 11b disposed on the forklift 33, and the primary side You may support the pad 11a for non-contact electric power feeding. When the driver stops the forklift 33 with the stop line 37 as a mark, an induced voltage is generated by an alternating magnetic field generated from the primary non-contact power supply pad 11a supported by the support member 44. The secondary side non-contact power supply pad 11b provided on the forklift 33 is pulled to the ground so as to be placed at the induced position.

  A support that can be expanded and contracted in the protruding direction by an actuator so that the secondary non-contact power supply pad 11b is securely disposed within a significant magnetic field generated from the primary non-contact power supply pad 11a. Using the arm as the support member 44, the primary-side non-contact power feeding pad 11a approaches and separates from the secondary-side non-contact power feeding pad 11b, and the primary-side non-contact power feeding pads 11a and 2 You may enable it to adjust the space | interval between the pads 11b for non-contact electric power feeding on the next side. Further, instead of the stop line 37, a wheel stopper for positioning the front wheel of the forklift 33 may be laid on the ground. Alternatively, as a member for guiding the forklift 33 so that the secondary-side non-contact power supply pad 11b is disposed within the range of a significant magnetic field generated from the primary-side non-contact power supply pad 11a, as shown in FIG. You may install the support stand 42 on a pair of ground. In this case, instead of the stop line 37, a wheel stopper for positioning the front wheel of the forklift 33 may be provided on at least one of the pair of support bases 42.

  When power is supplied to the forklift 33 from the rear of the vehicle body without contact, the secondary non-contact power supply pad 11b is provided behind the seat 33a of the forklift 33 and above the counterweight 33c as shown in FIG. . The arrangement of the non-contact power supply pad 11b on the secondary side is realized, for example, by fixing a plate-like member capable of holding the non-contact power supply pad 11b on the secondary side to the rear of the seat 33a of the forklift 33. May be. On the other hand, the non-contact power supply pad 11 a on the primary side is disposed so as to face the seat rear surface of the forklift 33. For example, as shown in FIG. 15, a support member 46 that is fixed to a wall 45 and protrudes in the horizontal direction is placed on the primary side at the same height as the secondary non-contact power supply pad 11b disposed on the forklift 33. You may support the pad 11a for non-contact electric power feeding. When the driver stops the forklift 33 with the stop line 37 as a mark, an induced voltage is generated by an alternating magnetic field generated from the primary non-contact power supply pad 11a supported by the support member 46. The secondary side non-contact power supply pad 11b provided on the forklift 33 is pulled to the ground so as to be placed at the induced position.

  A support that can be expanded and contracted in the protruding direction by an actuator so that the secondary non-contact power supply pad 11b is securely disposed within a significant magnetic field generated from the primary non-contact power supply pad 11a. Using the arm as the support member 46, the primary-side non-contact power feeding pad 11a approaches and separates from the secondary-side non-contact power feeding pad 11b, and the primary-side non-contact power feeding pads 11a and 2 You may enable it to adjust the space | interval between the pads 11b for non-contact electric power feeding on the next side. Further, instead of the stop line 37, a wheel stopper for positioning the rear wheel of the forklift 33 may be laid on the ground. Alternatively, as a member for guiding the forklift 33 so that the secondary-side non-contact power supply pad 11b is disposed within the range of a significant magnetic field generated from the primary-side non-contact power supply pad 11a, as shown in FIG. You may install the support stand 42 on a pair of ground. In this case, instead of the stop line 37, a wheel stopper for positioning the rear wheel of the forlift 33 may be provided on at least one of the pair of support bases 42.

  When power is supplied to the forklift 33 from the upper side of the vehicle body in a non-contact manner, the primary non-contact power supply pad 11 a is disposed so as to be opposed to the upper surface of the head guard 33 b of the forklift 33. For example, as shown in FIG. 16, the support member 48 that is fixed to the pillar 47 and protrudes in the horizontal direction has a higher magnetic flux path at a position higher than the head guard 33 b of the forklift 33. You may support the pad 11a for non-contact electric power feeding. When the driver stops the forklift 33 with the stop line 37 as a mark, an induced voltage is generated by an alternating magnetic field generated from the primary non-contact power supply pad 11a supported by the support member 48. The secondary side non-contact power supply pad 11b provided on the forklift 33 is pulled to the ground so as to be placed at the induced position.

  A support that can be expanded and contracted in the protruding direction by an actuator so that the secondary non-contact power supply pad 11b is securely disposed within a significant magnetic field generated from the primary non-contact power supply pad 11a. Using the arm as the support member 48, the primary-side non-contact power supply pad 11a approaches and separates from the secondary-side non-contact power supply pad 11b in the lateral direction (horizontal direction). You may enable it to adjust the position (horizontal direction) position of the non-contact electric power feeding pad 11a of the primary side with respect to the non-contact electric power feeding pad 11b. Further, instead of the stop line 37, a wheel stopper for positioning the front wheel of the forklift 33 may be laid on the ground. FIG. 12 shows a member for guiding the forklift 33 so that the secondary-side non-contact power supply pad 11b is disposed within a significant magnetic field generated from the primary-side non-contact power supply pad 11a. You may install the support stand 42 on a pair of ground. In this case, instead of the stop line 37, a wheel stopper for positioning the front wheel of the forklift 33 may be provided on at least one of the pair of support bases 42.

As described above, according to the present embodiment, the planar dimensions of the primary-side and secondary-side non-contact power supply pads 11a and 11b can be reduced as compared with pads in which coils are wound in a horizontal row, The degree of freedom of the position where the secondary contactless power supply pad 11b is disposed on the forklift can be improved. Therefore, the secondary-side non-contact power supply pad 11b can be easily attached to the forklift 33. Further, the magnetomotive force of the non-contact power feeding pads 11a and 11b on the primary side and the secondary side becomes strong, and the performance can be improved.
In particular, when the target to which power is supplied in a non-contact manner is an existing counterbalance type forklift 33, a counterweight 33c is disposed at the rear of the vehicle body, and when the counterweight 33c is processed and the pad 11b is attached, Since there is a possibility that the balance of the vehicle body cannot be maintained, the pad 11b cannot be attached to the counterweight 33c. Therefore, the existing counterbalance type forklift 33 has a problem that a space for attaching the pad is particularly narrow. According to the present embodiment, since the planar dimension of the pad 11b can be reduced, it is possible to relax restrictions on the location where the pad 11b is attached. Therefore, the secondary-side non-contact power supply pad 11b can be easily attached to the forklift 33. Furthermore, when the target for supplying electric power in a non-contact manner is an existing forklift 33, the forklift 33 has a strong vehicle body. Therefore, it takes time for the processing for attaching the pad 11b. The longer the planar dimension of the pad 11b is, the longer it becomes. On the other hand, according to the present embodiment, since the planar dimension of the pad 11b can be reduced, the working time for processing for attaching the pad 11b can be reduced. Therefore, it is possible to easily realize a system for transmitting electric power to an existing forklift 33 in a non-contact manner and charging the battery 31 of the forklift 33.

  In this embodiment, the counter-contact type electric forklift (battery vehicle) has been described as an example of the non-contact charging system for forklifts. However, the non-contact charging system for forklifts in this embodiment is shown in FIG. As shown, the present invention can also be applied to a reach type electric forklift (battery vehicle). The non-contact charging system shown in FIG. 17 corresponds to the non-contact charging system shown in FIG. 7. However, the modification and other examples of the non-contact charging system described in this embodiment are also shown in FIG. As with the contact charging system, it can be applied to reach-type forklifts.

11 Non-contact power supply pad 11a Primary non-contact power supply pad 11b Secondary non-contact power supply pad 12, 13 Magnetic pole region 14 First ferrite 15 Second ferrite 16, 17 Coil 21 High frequency power supply device 22, 31 Battery 33 Counterbalance type electric forklift 33a Seat 33b Head guard 34 Rectifier 35a Front wheel 35b Rear wheel 36 Support base 50 Reach type electric forklift

Claims (10)

A plate-like magnetic body with magnetic pole regions set at both ends, and
Around each magnetic pole region of the magnetic body, each coil comprises a coil wound spirally from the outside of the end of the magnetic body over the upper surface of the main body of the magnetic body,
Each of the coils is wound in a single plane on the upper surface of the main body of the magnetic body, and is wound in two stages up and down outside the end of the magnetic body.
The two of the coil, the contactless power supply pad and a voltage so that the magnetic flux path through the upper portion of the magnetic to the other is formed from one of the magnetic pole region is applied. Each of said coils, first from inside to outside the pole region of the magnetic body, wound over the upper surface of the main body portion of the previous SL magnetic from the outside edge of the magnetic body below the upper surface of the magnetic 2. The apparatus according to claim 1, wherein the wire is wound from the inside to the outside in a planar manner from the outside of the end of the magnetic body above the top surface of the magnetic body to the top surface of the main body of the magnetic body. Non-contact power supply pad.   Each of the coils is planarly wound on the magnetic pole region of the magnetic body from the outside to the inside and from the outside of the end of the magnetic body above the top surface of the magnetic body to the top surface of the main body of the magnetic body. When it reaches the end of the magnetic body, it descends downward and winds from the outside of the end of the magnetic body below the top surface of the magnetic body to the outside from the inside to the top surface of the main body of the magnetic body. The pad for non-contact electric power feeding according to claim 1 characterized by things.   4. The contactless power feeding pad according to claim 1, wherein a second magnetic body in contact with the magnetic body is provided in a magnetic pole region set in the magnetic body. 5. 5. The non-contact power feeding according to claim 4 , wherein a dimension of a magnetic pole region of the second magnetic body in a major axis direction of the magnetic body is set to ¼ or less of a major axis dimension of the magnetic body. pad. A primary non-contact power supply pad connected to an AC power source;
A non-contact power supply pad on the secondary side disposed on a forklift equipped with a battery;
A rectifier disposed on the forklift for rectifying the voltage sent from the non-contact power supply pad on the secondary side;
With
The contactless power supply pads on the primary side and the secondary side are the contactless power supply pads according to any one of claims 1 to 5,
Non-contact power supply, wherein the battery mounted on the forklift is charged by supplying non-contact power from the non-contact power supply pad on the primary side to the non-contact power supply pad on the secondary side. Non-contact charging system for forklift trucks using a pad. Further comprising a support base on which wheels mounted on one side of the forklift can be mounted;
The primary side non-contact power supply pad is provided on the support base;
The secondary side non-contact power supply pad is connected to the one side part of the forklift so that the power supplied from the primary side non-contact power supply pad can be received from below the one side part of the forklift. The non-contact charging system for a forklift using the non-contact power feeding pad according to claim 6, wherein the non-contact charging system is provided on a lower surface or a lower part of the forklift. The primary non-contact power supply pad is disposed so as to face the side surface of the forklift,
The secondary contactless power supply pad is provided on one side or side of the forklift so that the power supplied from the primary contactless power supply pad can be received from the side of the forklift. The non-contact charging system for a forklift using the non-contact power supply pad according to claim 6. The primary non-contact power supply pad is disposed so as to face the seat rear surface of the forklift,
The secondary non-contact power supply pad is provided behind the seat of the forklift so that the power supplied by the primary non-contact power supply pad can be received from the rear of the forklift. A non-contact charging system for forklifts using the non-contact power supply pad according to claim 6. The primary non-contact power supply pad is disposed so as to face the top surface of the head guard of the forklift,
The secondary contactless power supply pad is provided on the head guard of the forklift so that the power supplied by the primary contactless power supply pad can be received from above the forklift. A non-contact charging system for forklifts using the non-contact power supply pad according to claim 6.

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