JP2002078250A - Non-contact power supply method and non-contact power supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power supply method and a non-contact power supply apparatus which can adjust the obtained electric power optionally. SOLUTION: A pickup part 5 which acquires an induced electromotive force produced by the AC current passing through electric supply lines 2, 2, is formed in proximity to the electric supply lines 2, 2, by using a plurality of pickup cores 10A and 10B, and pickup coils 11A and 11B wound therearound respectively. An inductance of the pickup part 5 is changed by changing the distance d between the pickup cores 10A and 10B, and then the resonant frequency of a resonance circuit comprising the pickup part 5 is adjusted, and further the obtained electric power is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact power supply method and a non-contact power supply device for supplying an alternating current to a power supply line and supplying power via a pickup unit which is in a physical non-contact state with the power supply line. About.

[0002]

2. Description of the Related Art Monorail type transport equipment is widely used in factories or warehouses, and drive power to a traveling motor mounted on a transport vehicle is supplied through a feed line laid along the travel rail. Supplied via

[0003] As one of the power supply methods, a pickup unit provided on a carrier is brought close to the power supply line in a physically non-contact state from the power supply line, and an induced electromotive force generated by an alternating current flowing through the power supply line. There is a non-contact power supply method for obtaining electric power as electric power. The power receiving circuit including the pickup unit forms a resonance circuit that resonates at a frequency of an alternating current flowing through the power supply line, thereby increasing the efficiency of obtaining power.

In some cases, the resonance frequency of the resonance circuit does not match the power supply frequency of the AC power supply for power supply.
FIG. 15 is a graph showing the relationship between the resonance frequency of the resonance circuit and the obtained power, and the power supply frequency is indicated by a broken line. The obtained power is maximum when the resonance frequency of the resonance circuit and the power supply frequency match, and the obtained power decreases as the deviation between the two increases.
If there is a frequency deviation, the resonance frequency is adjusted by adjusting the number of turns of the pickup coil constituting the pickup unit or the capacitance of the capacitor of the resonance circuit in order to increase the power supply efficiency and obtain a larger power. There is a need.

[0005]

When adjusting the resonance frequency of the resonance circuit of the non-contact power feeding apparatus as described above, the number of turns of the pickup coil is changed every half turn because the connection position of the pickup coil is limited in structure. Can only be adjusted,
In addition, since the capacitor used in the resonance circuit can be adjusted only by a fixed combination of capacitances, it is difficult to set an arbitrary resonance frequency.

The present invention has been made in view of the above circumstances, and an object of the present invention is to easily change the inductance of the pickup unit and arbitrarily and easily adjust the resonance frequency of the resonance circuit. It is an object of the present invention to provide a non-contact power supply method and a non-contact power supply device.

[0007]

According to a first aspect of the present invention, there is provided a non-contact power supply method, comprising: bringing a pickup unit including a pickup core and a pickup coil wound around the pickup core close to a power supply line; In a contactless power supply method for supplying an alternating current to an electric wire and supplying an induced electromotive force generated in a resonance circuit including the pickup unit to a load, the pickup unit is configured using a plurality of pickup cores. By changing the interval between the plurality of pickup cores, the inductance of the pickup section is adjusted, and the resonance frequency of the resonance circuit is adjusted.

[0008] According to a second aspect of the present invention, there is provided a wireless power supply device.
Through a pickup unit composed of a pickup core and a pickup coil wound around the pickup core,
In a non-contact power supply device for supplying an induced electromotive force induced by an alternating current flowing through a power supply line to a load, the pickup unit includes a plurality of pickup cores, and a distance between the plurality of pickup cores can be changed. It is characterized by having been done.

According to a third aspect of the present invention, there is provided a non-contact power supply device,
A plurality of the pickup cores are arranged and held, and a holder for restricting movement of the plurality of pickup cores in directions other than the arranged direction is provided.In the middle of the held plurality of pickup cores, each of the plurality of pickup cores is provided. A link mechanism for interlocking the movement of the object.

According to the first and second aspects of the present invention, since the interval between the plurality of pickup cores constituting the pickup unit is arbitrarily changeable, the inductance of the pickup unit is changed by changing the interval. By adjusting the resonance frequency of the resonance circuit for power reception arbitrarily, it is possible to obtain a wireless power supply device capable of obtaining required power.

In the invention according to a third aspect, the plurality of pickup cores are arranged, and the plurality of pickup cores are movable in the arranged direction, and are restricted so as to restrict movement in other directions. The pickup core is held by a holder, and a link mechanism for interlocking the movement of the plurality of pickup cores is provided in the middle of the plurality of held pickup cores.
The distance between the plurality of pickup cores can be easily adjusted.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. (Embodiment 1) FIG. 1 is a block diagram showing a configuration in a case where a non-contact power supply device according to the present invention is used for a monorail type transfer facility. In the figure, reference numeral 4 denotes a carrier, and an AC power supply 1
Is supplied with power through the feeder line 2 to which
It travels along the rail 3 on which the power supply line 2 is laid.
The carrier 4 is provided with a power receiving pickup unit 5 in proximity to the power supply line 2. A capacitor circuit 6 is connected to the pickup section 5, and the pickup section 5 and the capacitor circuit 6 constitute a power receiving resonance circuit 7. When an alternating current flows through the power supply line 2, an induced electromotive force is generated in the resonance circuit 7, and power is supplied to the motor 8 of the carrier 4 and the control circuit 9 that controls the driving of the motor 8.

FIG. 2 is a plan view showing a configuration of the pickup unit 5 according to the first embodiment of the present invention. The pickup unit 5 includes two pickup cores 10A and 10B.
And pickup coils 11A and 11B wound around pickup cores 10A and 10B.

FIGS. 3, 4 and 5 are a perspective view, a front view and a rear view, respectively, showing the pickup core 10A and the pickup coil 11A together with the feed line 2. FIG. The pickup core 10A arranges two magnetic materials formed in a C shape in a front view, with their open sides facing in the same direction,
It is constructed by assembling into an approximately E-shape using an adhesive or the like. A pickup coil 11A is wound around the E-shaped non-opening leg in a series as shown in the figure. The pickup core 10A is disposed inside the E-shape so as to surround the power supply lines 2 and 2. The pickup core 10B and the pickup coil 11B are similarly configured.

As described above, the pickup cores 10A and 10B arranged so as to surround the power supply lines 2 and 2 are connected to the power supply lines 2 and 2 respectively.
2, the pickup coils 11A and 11B wound around each are connected in series to form a pickup unit 5
Is configured. Pickup coils 11A and 11
Both ends of a circuit in which B is connected in series are connected to a load via a capacitor circuit 6.

FIG. 6 is a front view showing the pickup unit 5 held by the holder 12, and FIGS. 7 and 8 are a side view and a plan view, respectively. The pickup unit 5 is held by using a holder 12 made of a non-magnetic material, and is installed on the side of the carrier 4 facing the power supply lines 2, 2. 7 and 8, the holder 12 is indicated by a two-dot chain line.
The holder 12 is formed in a substantially U-shape in a front view, and a rectangle in a side view and a plan view.
Enclosing the upper and side surfaces of the pickup cores 10A and 10B so that the pickup cores 10A and 10B wound with 1B can slide only in the front direction and the rear direction,
The side faces are supported to hold pickup cores 10A and 10B.

At the center of the holder 12, a vertical shaft 13 is fixedly provided on the upper surface, and a disk 14 rotatable around the vertical shaft 13 is provided to be supported by the vertical shaft 13. ing. Further, the pickup cores 10A and 10A
B is arranged on both sides of the disk 14. One end of a rod 15A is swingably connected to the pickup core 10A, and the other end of the rod 15A is swingably connected to a point other than the center of the disk 14. Similarly, disk 1
One end of a rod 15B is swingably connected to a point symmetrical to the point with respect to the center of 4, and the other end of the rod 15B is swingably connected to the pickup core 10B. As a whole, the pickup core 1 is rotated through the rotation of the disk 14.
A link mechanism in which the sliding of the pickup core 10A and the sliding of the pickup core 10B interlock is configured.

The distance d between the pickup cores 10A and 10B can be freely changed by the function of the link mechanism. After changing the distance d to the required size,
4 is fixed to the upper surface of the holder 12 with bolts,
By fixing the disk 14, the inductance L of the entire pickup unit 5 is adjusted.

The inductance L of the entire pickup unit 5
Are the inductances of the pickup coils 11A and 11B and the pickup coils 11A and 11B.
It is obtained from the sum of the mutual inductance between B. When the distance d between the pickup cores 10A and 10B is changed, the mutual inductance changes. FIG. 9 is a graph showing the relationship between the distance d between the pickup cores, the inductance L, and the resonance frequency f of the resonance circuit 7, where the inductance L is indicated by a solid line (see the left vertical axis). f is indicated by a broken line (see the right vertical axis).
Since the mutual inductance reduces the inductance L, when the distance d between the pickup cores is reduced, the mutual inductance increases and the inductance L decreases. Conversely, when the distance d between the pickup cores is increased, the inductance L increases.

The resonance frequency f of the resonance circuit 7 is determined by f = 1 / 2π の (LC) using the inductance L of the entire pickup section 5 and the capacitance C of the capacitor circuit. Therefore, when increasing the distance d between the pickup cores, the inductance L increases and the resonance frequency f of the resonance circuit 7 decreases. Conversely, when the distance d between the pickup cores is reduced, the resonance frequency f increases.

In the first embodiment as described above, the inductance L of the pickup section 5 is adjusted by changing the distance d between the pickup cores, and the resonance frequency f of the resonance circuit 7 is arbitrarily and easily adjusted. Can be. In addition, it is possible to obtain a non-contact power supply device that can obtain required power in the transport vehicle 4.

When there is a curve on the rail 3, it is necessary to determine the position of the center of gravity of the transport vehicle 4 so that the balance is not lost when turning the curve. In the first embodiment, the pickup cores 10A and 10B are
2, the center of gravity of the pickup unit 5 does not move before and after the adjustment of the distance d between the pickup cores. Therefore, when the vertical axis 13 and the rotation center of the transport vehicle 4 are matched, the center of gravity of the transport vehicle 4 does not move before and after the adjustment of the distance d between the pickup cores. For this reason, the resonance frequency can be adjusted without sacrificing the ease of curve bending.

In the present embodiment, the shape of the pickup cores 10A and 10B is a shape in which two C-shapes are arranged side by side when viewed from the front. However, the present invention is not limited to this shape, and other shapes may be used. For example, the power supply lines 2 and 2 may be formed in an H-shape when viewed from the front. The pickup coils 11A and 11B are
Although the form wound around the non-open side legs of A and 10B has been described, the present invention is not limited to this form, and may be a form wound around another position such as the side of the pickup cores 10A and 10B. Further, although the embodiment in which the link mechanism is configured using the disk 14 has been described, a mode in which a member having another shape such as a polygon or a rod may be used instead of the disk 14. When a rod-shaped member is used, the center of the member is supported by a vertical shaft 13 and a rod 15 is attached to one end of the member.
A is swingably connected, and a rod 15B is connected to the other end, whereby a link mechanism having the same effect can be configured.

(Embodiment 2) FIG. 10 is a plan view showing a configuration of a pickup unit 5 according to Embodiment 2 of the present invention. In the second embodiment, the pickup unit 5 includes two pickup cores 10A and 10B.
And the pickup coils 11A wound therearound, respectively.
And 11B are connected in parallel. Both ends of the pickup coils 11A and 11B connected in parallel are connected to a load via a capacitor circuit (not shown).
The configuration other than the pickup unit 5 is the same as that of the above-described first embodiment, and a description thereof will be omitted.

When the distance d between the pickup cores 10A and 10B is changed, the mutual inductance between the pickup coils 11A and 11B changes as in the first embodiment, and the entire inductance changes. Therefore, even in the second embodiment in which the pickup coils 11A and 11B are connected in parallel, by changing the distance d between the pickup cores, the inductance of the pickup unit 5 is changed and the resonance frequency of the resonance circuit is adjusted. Can be.

(Embodiment 3) FIG. 11 is a side view showing the structure of a pickup section 5 according to Embodiment 3 of the present invention, in which a holder 12 is shown by a two-dot chain line. In the third embodiment, the pickup core 1 is
0A, 10B, and 10C are held, and the pickup cores 10A, 10B, and 10C are configured to be slidable in the direction of contact and separation with each other. Each pickup core 10A, 1
Pickup coil 11 wound around 0B and 10C
A, 11B, and 11C are connected to each other in series or in parallel, and are connected to a load via a capacitor circuit (not shown). The configuration other than the pickup unit 5 is the same as that of the above-described first embodiment, and a description thereof will be omitted.

Also in the third embodiment, by changing the distances d1 and d2 between the pickup cores, the inductance of the pickup section 5 can be arbitrarily adjusted, and the resonance frequency of the resonance circuit can be adjusted. Note that FIG.
Has three pickup cores and a pickup unit 5
Is shown, but it goes without saying that a similar effect can be obtained when a larger number of pickup cores are used.

(Embodiment 4) FIG. 12 is a plan view showing the structure of a pickup section 5 according to Embodiment 4 of the present invention.
The holder 12 is indicated by a two-dot chain line. The holder 12 is the same as that of the first embodiment, and has a configuration in which the pickup cores 10A and 10B can slide in the contact and separation directions. In the present embodiment, the pickup coil 11 is wound between the pickup cores 10A and 10B, and further wound with an inner diameter when the interval d between the pickup cores is the maximum, and is made of synthetic resin. It is molded and fixed to the upper surface of the holder 12. Both ends of the pickup coil 11 are connected to a load via a capacitor circuit (not shown). The configuration other than the pickup unit 5 is the same as that of the above-described first embodiment, and a description thereof will be omitted. Also in the fourth embodiment, by changing the distance d between the pickup cores, it is possible to change the inductance of the pickup unit 5 and adjust the resonance frequency of the resonance circuit. Although FIG. 12 shows a case where two pickup cores are used, it goes without saying that the same effect can be obtained when a larger number of pickup cores are used.

(Embodiment 5) FIGS. 13 and 14 are a plan view and a side view, respectively, showing the structure of a pickup section 5 according to Embodiment 5 of the present invention. I have. The pickup cores 10A and 10B are held from the outside by the holder 12, and
1A and 11B are pickup cores 10A and 10B, respectively.
B is wound. Pickup coils 11A and 1
1B are connected in series, and a coil wire connecting them is wound around a bobbin 16 made of a non-magnetic material and installed at the center of the holder 12. The bobbin 16 is formed in a cylindrical shape, and a screw is formed on the inner side.
7 is screwed. Pickup coil 1
Both ends of a circuit in which 1A and 11B are connected in series are connected to a load via a capacitor circuit (not shown). The structure other than the pickup unit 5 is the same as that of the first embodiment.
The description is omitted.

In the fifth embodiment, it is possible to arbitrarily increase the inductance of the pickup unit 5 by increasing the number of turns of the coil wire wound around the bobbin 16 or by screwing the core 17 with a driver or the like. it can. Also,
When the winding of the coil wire is reversed in the figure, the inductance can be reduced by the same operation. Although the bobbin 16 has a cylindrical shape in the present embodiment,
The shape is not limited to a cylindrical shape, and may be, for example, a polygonal column shape. In this case, the same effect can be obtained by inserting the core 17 to an appropriate depth and fixing it with an adhesive or the like. As described above, in the fifth embodiment, even when there is a limit to the amount by which the distance d between the pickup cores can be changed, the inductance of the pickup unit 5 is arbitrarily adjusted to freely set the resonance frequency of the resonance circuit. Can be adjusted.

[0031]

According to the first and second aspects of the present invention,
Since the interval between the plurality of pickup cores used in the pickup unit of the non-contact power feeding device can be arbitrarily changed,
It is possible to arbitrarily adjust the inductance of the pickup unit. This makes it possible to arbitrarily set the resonance frequency of the resonance circuit for power reception, and to obtain a wireless power supply device capable of obtaining required power.

According to the third aspect of the present invention, since a link mechanism for interlocking the movement of each of the plurality of pickup cores is provided at the center of the holder for holding the plurality of pickup cores, the link mechanism is operated. By fixing the plurality of pickup cores, the interval between the plurality of pickup cores can be easily adjusted. In addition, the present invention has excellent effects such that the position of the center of gravity of the carrier using the non-contact power supply device according to the present invention can be maintained during the adjustment.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration in a case where a non-contact power supply device according to the present invention is used in a monorail type transfer facility.

FIG. 2 is a plan view showing a configuration of a pickup unit according to the first embodiment.

FIG. 3 is a perspective view showing a pickup core and a pickup coil together with a power supply line.

FIG. 4 is a front view showing a pickup core and a pickup coil together with a power supply line.

FIG. 5 is a rear view showing a pickup core and a pickup coil together with a power supply line.

FIG. 6 is a front view showing a pickup unit held by a holder.

FIG. 7 is a side view showing a pickup unit held by a holder.

FIG. 8 is a plan view showing a pickup unit held by a holder.

FIG. 9 is a graph showing a relationship between an interval between pickup cores, an inductance of a pickup unit, and a resonance frequency of a resonance circuit.

FIG. 10 is a plan view illustrating a configuration of a pickup unit according to a second embodiment.

FIG. 11 is a side view illustrating a configuration of a pickup unit according to a third embodiment.

FIG. 12 is a plan view showing a configuration of a pickup unit according to a fourth embodiment.

FIG. 13 is a plan view illustrating a configuration of a pickup unit according to a fifth embodiment.

FIG. 14 is a side view illustrating a configuration of a pickup unit according to a fifth embodiment.

FIG. 15 is a graph showing the relationship between the resonance frequency of the resonance circuit and the obtained power.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Power supply line 3 Rail 4 Carrier 5 Pickup part 6 Capacitor circuit 7 Resonance circuit 8 Motor 9 Control circuit 10A, 10B, 10C Pickup core 11, 11A, 11B, 11C Pickup coil 12 Holder 13 Vertical axis 14 Disk 15A , 15B rod 16 bobbin 17 core

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Fumio Hatada, Inventor 4-17-17, Tsurumi, Tsurumi-ku, Osaka-shi, Osaka F-term in Tsubakimoto Chain Co., Ltd. (Reference) 5H105 BA03 BB07 CC02 CC19 DD10

Claims (3)

[Claims] 1. A resonance unit including a pickup core including a pickup core and a pickup coil wound around the pickup core, and an AC current flowing through the pickup line, the resonance unit including the pickup unit. In a non-contact power supply method for supplying an induced electromotive force generated in a circuit to a load, the pickup unit is configured by using a plurality of pickup cores, and by changing an interval between the plurality of pickup cores, A non-contact power supply method comprising: adjusting an inductance to adjust a resonance frequency of the resonance circuit. 2. A non-contact power supply device for supplying an induced electromotive force induced by an alternating current flowing through a power supply line to a load via a pickup unit including a pickup core and a pickup coil wound around the pickup core. The contactless power supply device, wherein the pickup unit includes a plurality of pickup cores, and is configured to be able to change an interval between the plurality of pickup cores. 3. A holding device for holding the plurality of pickup cores side by side and restricting movement of the plurality of pickup cores in directions other than the direction in which the plurality of pickup cores are arranged. The non-contact power supply device according to claim 2, further comprising a link mechanism for interlocking the movement of each of the pickup cores.