JPH1094103A - Non-contact feed system to moving body and pickup coil unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to make the line length longer if feed lines of the same breakdown voltage are used and to use smaller primary current or a shorter pickup coil if the same feed capacity is to be obtainted. SOLUTION: Four feeder lines 6a to 6d are arranged parallel each other at a given space along a guide rail for guiding a carrier truck and a feeder line is bent for wiring so that electric currents in the neighboring feeder lines flows in the opposite direction to each other. Two pickup coil units 9, each made up of a core 12 of 'E' shape in cross section and a pickup coil 13 wound onto the center protruding part 12a of the core 12, are mounted onto the carrier truck via a mounting member 11 in such a manner that the pickup coils 13 come to the position between two feeder lines 6a, 6b, 6c, 6d neighboring each other. Both pickup coils 13 are connected in series.

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 system for a moving body that supplies power used by a moving body that moves along a guide rail, and a pickup coil unit.

[0002]

2. Description of the Related Art Conventionally, a transport system for transporting a load by a moving body moving along a guide rail has been proposed and implemented, and the efficiency of physical distribution in factories and warehouses has been improved. Generally, a traveling motor is used for traveling of a moving body. The driving power of the traveling motor is supplied through a power supply line (power trolley line) through which an alternating current (generally, 200 V) is laid on the guide rail.

[0003] This power supply method includes a trolley type and a non-contact type. The trolley type is a method of supplying power by bringing a current collector provided on a moving body side into contact with a power supply line. The non-contact type is a method in which a pickup coil provided on a moving body side is arranged near a power supply line, and an induced electromotive force is generated in the pickup coil to obtain electric power. While the trolley type has problems such as necessity of maintenance due to abrasion of the current collector and generation of dust and sparks, the non-contact type has no such problems. Therefore, the non-contact type has attracted attention in recent years because it is superior to the trolley type in that respect.

Generally, in this type of non-contact type power supply method, as disclosed in, for example, Japanese Patent Application Laid-Open No. 5-207606, a power supply line arranged in close proximity and parallel in a reciprocating state is used.
A pickup coil unit in which a coil is wound around a central convex portion of a core having an E-shaped cross section is used. The pickup coil unit is used by being attached to a moving body such that the central convex portion is located at the center of a pair of upper and lower power supply lines, and the upper and lower convex portions of the core are located above and below the guide wire, respectively. Then, an AC magnetic flux generated by an AC primary current flowing through the power supply line flows through the core, and an induced electromotive force is generated in the coil by the AC magnetic flux and supplied to the moving body.

In order to secure a larger power as the induced electromotive force of the pickup coil, it is necessary to lengthen the pickup coil or increase the primary current. However, if the pickup coil is lengthened, the device becomes larger. In addition, it has been difficult to increase the primary current from the viewpoints of withstand voltage and heat generation of the power supply line.

[0006] Japanese Patent Application Laid-Open No. 6-31603 discloses a guide line in which one feed line is wound in a double loop, and a pickup coil is moved along the vicinity of the guide line. A device in which a pickup coil unit is attached to a moving body is disclosed. In this device, the power supply line is accommodated in the guide line cartridge, and the pickup coil unit moves near the cartridge. Therefore, the pickup coil is not disposed between the power supply lines, and the magnetic flux generated in the power supply line efficiently flows through the core. hard. In order for the magnetic flux generated in the feeder line to efficiently flow through the core, a coil 52 is wound around a central convex portion 51a of the core 51 having an E-shaped cross section, as shown in FIGS. 10 (a) and 10 (b). In addition, it is necessary to arrange the pickup coil unit 54 such that the double portion of the power supply line 53 is located between the central convex portion 51a and the convex portions 51b on both sides.

[0007]

When the feed line 53 is formed into a coil of two or more turns and the pickup coil unit 54 is arranged as shown in FIGS. 10A and 10B, the magnetomotive force of the feed line becomes large. Although it is possible, the power supply line 53 is
When two are arranged horizontally as shown in FIG.
It is necessary to lengthen a and 51b, and when two are arranged up and down, it is necessary to widen the interval of each convex part 51a and 51b, and the pickup coil unit 54 is enlarged.
The inductance L of the power supply line is proportional to the square of the number of turns n when the power supply line is wound in a loop shape (coil shape). When the power supply line is formed in a loop shape, the inductance of the power supply line becomes a loop shape. Is larger than if not
The line length is shortened due to the limitation of the withstand voltage of the power supply line. Increasing the diameter of the feed line can increase the primary current, but also has the problem of increasing the size of the pickup coil unit.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object the purpose of using a power supply line having the same withstand voltage so that the line length, that is, the traveling path of the moving body can be lengthened and the same power supply capacity can be obtained. It is an object of the present invention to provide a non-contact power supply system for a moving object and a pickup coil that can use a smaller primary current or a shorter pickup coil.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, power used by a moving body moving along a guide rail is supplied to a power supply wired along the guide rail. A non-contact power supply system for a moving object supplied through a pickup coil that generates an induced electromotive force based on an alternating current supplied to an electric wire, wherein four or more even-numbered power supplies are provided in a movement range of the pickup coil. The power supply lines are arranged in parallel with each other at a predetermined interval, and one power supply line is bent and wired so that the direction of the current flowing through the adjacent power supply lines is reversed, and at least two pickup coils are connected to the even numbered pickup coils. Each of the two power supply lines is attached to the moving body so as to be arranged at a position where at least a part thereof overlaps with the moving direction of the moving body between two adjacent power supply lines. Up coil output voltage is connected to the same phase.

In the invention described in claim 2, the even-numbered power supply lines are arranged so as to be located on one surface along the guide rail. According to a third aspect of the present invention, in the second aspect of the present invention, the four feed lines are arranged so that four feed lines are arranged in a vertical direction or a horizontal direction, and two pickup coils are two different feed lines. The two pickup coils are connected in series with each other via different cores so as to be located therebetween.

According to a fourth aspect of the present invention, in the second aspect of the invention, the even-numbered power supply lines are arranged so as to be arranged vertically or horizontally, and the number of the power supply lines is one less than the number of the power supply lines. The pickup coils are attached to the moving body in a state where the pickup coils are wound around convex portions protruding from one core so as to be located between adjacent power supply lines.

According to a fifth aspect of the present invention, in the first aspect of the invention, the even-numbered power supply lines are arranged on two surfaces along the guide rail. The invention according to claim 6 is the invention according to claim 5,
The feed lines are arranged such that a total of four feed lines are vertically arranged two by two at substantially equal intervals, and a core having a substantially cross-shaped cross section is provided on the moving body such that the center of the cross is substantially at the center of the four feed lines. A pickup coil is wound around at least two projections of the core.

According to a seventh aspect of the present invention, there is provided a pickup coil unit for use in the non-contact power supply system for a moving body according to the fourth aspect, wherein three convex portions for winding the pickup coil are provided. It comprises a core projecting in parallel, and a pickup coil wound around each projection of the core and connected so that their output voltages have the same phase.

According to an eighth aspect of the present invention, there is provided a pickup coil unit for use in a non-contact power supply system for a moving body according to the sixth aspect, wherein the four protrusions have a substantially cross-shaped cross section. And a pickup coil wound around at least two projections of the core and connected so that their output voltages have the same phase.

According to the first to sixth aspects of the present invention, the power used by the moving body that moves along the guide rail is based on the alternating current supplied to the power supply line wired along the guide rail. It is supplied via a pickup coil that generates an induced electromotive force. The at least two pickup coils attached to the moving body may be configured such that each pickup coil bends one feed line and arranges two feed lines adjacent to each other among an even number of feed lines arranged as a plurality of reciprocating lines. Is maintained at a position where at least a part of the moving body overlaps with the moving direction of the moving body. The magnetic flux generated by the alternating current flowing through the adjacent feeder is
The pickup coils arranged between them are linked in the same direction, that is, in a direction in which they mutually reinforce each other, and the induced electromotive force due to the magnetic flux is efficiently generated. The output of each pickup coil is taken out so that its voltage becomes a sum. Since the power supply line is not formed in a coil shape (loop shape), the inductance of the power supply line becomes smaller than that in the case of the coil shape. Since the plurality of pickup coils are arranged at positions where at least a part thereof overlaps with the moving direction of the moving body,
It is not necessary to secure a long space for mounting the pickup coil in the traveling direction of the moving body.

According to the second aspect of the present invention, since the even-numbered power supply lines are arranged so as to be located on one surface along the guide rail, the power supply lines can be supported and the pickup coil can be moved to the moving body. Mounting becomes easy.

According to a third aspect of the present invention, in the second aspect of the invention, the four power supply lines are arranged so as to be arranged in a vertical direction or a horizontal direction, and two pickup coils are provided in the moving body. Since it is attached, the space for arranging the feeder and the space for arranging the pickup coil are reduced. Since the phases of the output voltages of both pickup coils are the same, an output of a voltage twice as large as the output voltage of each pickup coil can be taken out by connecting both pickup coils in series.

According to the invention described in claim 4 and claim 7,
In the invention described in claim 2, the pickup coils are arranged at all positions between adjacent power supply lines. The phases of the output voltages of adjacent pickup coils are 180
° is off. Since the pickup coils are connected so that their output voltages have the same phase, an output voltage of N times (N is the number of pickup coils) the output voltage of one pickup coil as a whole is obtained. .

According to a fifth aspect of the present invention, in the first aspect of the present invention, the even-numbered power supply lines are arranged so as to be located on two surfaces along the guide rail. Therefore, it is not necessary to secure a large height or width for arranging the power supply lines as compared with the case where the power supply lines are arranged so as to be located on one plane.

[0020] In the invention according to claims 6 and 8,
In the invention according to claim 5, the number of the power supply lines is four, but the core is substantially cross-shaped in cross section and the center of the cross is four.
Since the power supply line is attached to the moving body so as to be located substantially at the center of the power supply line, the pickup voltage is wound around the four protrusions of one core to reduce the output voltage of one pickup coil. It is possible to obtain four times the output voltage.

According to a seventh aspect of the present invention, in the fourth aspect of the invention, three pickup coils are provided, and an output voltage that is three times the output voltage of one pickup coil is obtained.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 to 3 show a first embodiment in which the present invention is embodied in an unmanned transport system in which a transport vehicle as a moving body travels on a guide rail provided on a ceiling. It will be described according to.

As shown in FIG. 2, a transport carriage 1 for transporting a load is a guide rail 2 having a substantially U-shaped cross section which is installed on a ceiling.
And a plurality of stations (not shown) provided along the guide rail 2 to transfer the load. The carriage 1 has a drive wheel 3 and a driven wheel (not shown) that roll on a guide rail 2, and guide wheels 4 a, which hold a guide ridge 2 a of the guide rail 2.
4b, and is supported by the guide rail 2 in a suspended state. The support structure of the drive wheel 3, the driven wheel, and the guide wheels 4a and 4b is the one proposed by the applicant of the present application (Japanese Patent Laid-Open No. 8-727).
No. 09). A traveling motor 5 composed of a three-phase induction motor is mounted on the carriage 1, and the drive wheels 3 are driven by the driving of the traveling motor 5 so that the carriage 1 travels along the guide rail 2.

On the side surface of the guide rail 2, four support arms 7 provided with four power supply lines 6a to 6d made of a litz wire are provided on the side opposite to the surface of the guide rail 2 facing the drive wheel 3. It is arranged so as to be located on one surface along the guide rail 2 through the guide rail 2. As shown in FIG. 1, four feeder lines 6a to 6d are formed by bending one feeder line 6 and moving the pickup coil described later.
Are arranged in parallel with each other at predetermined intervals (in this embodiment, at equal intervals), and are wired so that the directions of currents flowing in adjacent power supply lines are reversed.

Both ends of the power supply line 6 are connected to a power supply 8 so that an alternating current of 10 kHz is supplied. As shown in FIG.
A pair of upper and lower pickup coil units 9 are arranged so as to oppose a to 6d. Each of the pickup coil units 9 is mounted on a support bracket 10 provided on the carrier body for supporting the drive wheel 3 and the driven wheel via a non-magnetic (in this embodiment, synthetic resin) attachment member 11. Supported. As shown in FIGS. 2 and 3, the pickup coil unit 9 has a cross-sectional shape substantially perpendicular to the power supply lines 6a to 6d when the pickup coil unit 9 is arranged at a predetermined position with respect to the power supply lines 6a to 6d. It comprises an E-shaped ferrite core 12 and a pickup coil 13 wound around the core 12. The pickup coil 13 is wound around the central projection 12a of the core 12. Double pickup coil 13
Are connected in series with each other. The length of the core 12 and the number of turns of the pickup coil 13 are set according to the capacity of the pickup coil unit 9.

In the pickup coil unit 9 disposed on the upper side, the upper (first) power supply line 6a is connected between the upper convex portion 9a and the central convex portion 9b by the central convex portion 9b and the lower convex portion 9b.
The second power supply line 6b is supported by the support bracket 10 so as to pass between the second power supply line 6c and the second power supply line 6c. In the pickup coil unit 9 disposed on the lower side, a third power supply line 6c is provided between the upper convex portion 9a and the central convex portion 9b so as to be connected to the central convex portion 9b.
The fourth power supply line 6d is supported by the support bracket 10 so that the fourth power supply line 6d passes between the lower projection 9c and the lower projection 9c.

FIG. 1 shows an electric circuit of a power supply device 8 on the ground side for supplying high-frequency power to the power supply lines 6 a to 6 d and a power supply device 14 mounted on the carrier 1. The power unit 8 on the ground side is A
A C / DC conversion circuit 15;
Is a 200V, 60Hz three-phase AC power supply 200V
DC power supply. The DC power converted by the AC / DC converter 15 is supplied to the DC / AC converter 17.

The DC / AC conversion circuit 17 comprises a first drive circuit section 17a and a second drive circuit section 17b. Both drive circuit sections 17a and 17b are connected to the AC / DC conversion circuit 15 in parallel with each other. The output terminal of the first drive circuit section 17a is connected to the start end of the power supply line 6 via a capacitor 18 for resonance. The output terminal of the second drive circuit section 17b is connected to the end of the power supply line 6. Each of the transistors T1 to T8 is on / off controlled by a controller (not shown), and supplies power of a high-frequency sine waveform of 10 kHz to the power supply line 6.

The power supply 14 mounted on the carrier 1 has a rectifier circuit 19, and the rectifier circuit 19 has an input terminal connected to a series circuit of the pickup coil 13 and a capacitor 20 for adjusting output. The output terminal of the rectifier circuit 19 is connected to the traveling motor 5 via the inverter 21. A smoothing capacitor 22 is connected between the rectifier circuit 19 and the inverter 21. The inverter 21 is controlled by a command from a control device (not shown) mounted on the carriage 1, and the frequency-converted three-phase AC power is supplied to the traveling motor 5.
It is supplied to. The control device controls the traveling and stopping of the transport vehicle 1 based on a command from an operation control device (not shown).

Next, the operation of the above-configured apparatus will be described. A control signal is output from the control device to the inverter 21 based on a command from an operation control device (not shown). Then, the drive of the traveling motor 5 is controlled via the inverter 21, and the transport trolley 1 moves along the guide rail 2, and the load is transported between predetermined stations.

The power supply devices 8 to 10 are connected to the power supply lines 6a to 6d.
A high-frequency sinusoidal power (primary current) of kHz is supplied. Then, a magnetic flux is generated around each of the power supply lines 6a to 6d, and an induced electromotive force is generated in the pickup coil 13 arranged close to each of the power supply lines 6a to 6d. The induced electromotive force generated by the pickup coil 13 is converted to direct current by the rectifier circuit 19, smoothed by the smoothing capacitor 22, and output to the inverter 21. And the inverter 21
The three-phase AC power whose voltage and frequency have been converted by the above is supplied to the traveling motor 5.

That is, the power supply lines 6 a to 6 b (primary coils) arranged along the guide rail 2 and the pickup coil 13 (secondary coil) wound around the core 12 mounted on the carrier 1. The power is supplied to the carrier 1 in a non-contact manner. A primary current and an electromotive force of a voltage proportional to the inductance of the secondary coil are obtained from each pickup coil 13.

As shown in FIG. 3, the directions of the currents flowing through each of the pair of feeder lines 6a, 6b, 6c, 6d provided so as to sandwich the central projection 9b of the pickup coil unit 9 are opposite to each other. Feeding lines 6a, 6b, 6 forming a pair
The directions of magnetic fluxes S generated around c and 6d are opposite to each other as shown by arrows. However, the wound center convex portion 9b of the pickup coil 13 is connected to the feeder lines 6a, 6b, 6b.
c, 6d, the feed lines 6a, 6b, 6
The direction of the magnetic flux S generated from c and 6d and passing through the central convex portion 9b is the same, and the induced electromotive force is efficiently applied to each pickup coil 13 by the change in the magnetic flux generated from the feeder lines 6a, 6b, 6c and 6d. Occur.

An alternating current of the same phase is generated in the two pickup coils 13, and the two pickup coils 13 are connected in series, so that the voltage output to the rectifier circuit 19 is the voltage of the voltage generated in each pickup coil 13. Double.

2 output from the pickup coil 13
The magnitude of the secondary voltage is proportional to the primary current and the length of the core 12 (when the number of turns of the pickup coil 13 is the same). Conventionally, there has been a configuration in which two pickup coil units are arranged along a power supply line, and the pickup coils of each pickup coil unit are connected in series. However, since the core is arranged along the two feeder lines arranged in parallel, a double length is required to attach the pickup coil unit to the moving body, and it is difficult to secure an installation space. In the configuration of this embodiment, the pickup coil units 9 are arranged vertically in two stages, so that the space required for mounting the pickup coil units 9 along the moving direction of the carrier 1 is only half of the conventional space.

Also, instead of arranging the power supply line 6 in the form of a two-turn coil, one power supply line 6 is simply bent so that the four power supply lines 6a to 6d are arranged in parallel. Therefore, when compared with the same line length, it is ₀ of the inductance L ₀ of the two-turn coiled power supply line.

The voltage V applied to the feed line 6 is given by V = ωLi
(Ω: angular frequency, L: inductance, i: primary current)
And the inductance L is proportional to the line length. Therefore, when a cable having the same withstand voltage specification is used for the power supply line 6, one power supply device 8 for wiring in a coil shape is used.
, The line length can be doubled.

This embodiment has the following effects. (B) Four or more power supply lines 6a to 6d are connected to one power supply line 6.
Is bent and arranged as a plurality of reciprocating lines, so that the inductance of the feeder line is smaller than that in the case of arranging in a coil shape. As a result, when the power supply lines having the same withstand voltage are used, the line length, that is, the traveling path of the moving body can be made longer with one power supply device 8 as compared with the case where the power supply lines are arranged in a coil shape.

(B) Since the pickup coil 13 is arranged at the same position in the moving direction of the moving body between the two power supply lines adjacent to each other, the space for mounting the plurality of pickup coils 13 is moved. There is no need to secure a longer length in the direction of body movement. As a result, when the lengths of the pickup coil units 9 are the same, a predetermined secondary voltage can be obtained with a smaller primary current, heat generation (Joule loss) of the power supply line is suppressed, and The wires can be made thinner, so that the pickup coil can be made smaller and the line length can be made longer. . Further, when primary currents of the same magnitude are used, a shorter pickup coil 13 can be used, and the pickup coil unit 9 can be downsized.

(C) Since the even-numbered power supply lines 6a to 6d are arranged on one surface along the guide rail 2, the power supply lines 6a to 6d are positioned on two different surfaces. Power supply lines 6a to 6
6d and the pickup coil 13 can be easily attached to the moving body.

(D) Since the four power supply lines 6a to 6d are arranged vertically, there is no need to secure a large space in the width direction of the guide rail. (E) Since the phases of the output voltages of the two pickup coils 13 attached to the carrier 1 (moving body) are the same,
By connecting both pickup coils 13 in series, an output of a voltage twice as high as the output voltage of each pickup coil 13 can be taken out.

(F) The pickup coil unit 9 has a pickup coil 13 wound around a central projection 12a of a core 12 having a substantially E-shaped cross section, and feed lines 6a, 6 arranged so as to sandwich the pickup coil 13. , 6c, 6
d is used in a state where currents flow in opposite directions. Accordingly, the magnetic flux S generated from the pair of power supply lines 6a, 6b, 6c, 6d efficiently passes through the core 12, and
When the magnetic flux S generated from the power supply lines 6a, 6b, 6c, 6d passes through the pickup coil 13, the direction is the same, so that the induced electromotive force is efficiently generated by the magnetic flux S linked to the pickup coil 13. .

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. In this embodiment, the configuration of the pickup coil unit 9 and the number of pickup coils 13 are different from those of the above-described embodiment, and other configurations such as a support structure of the feeder lines 6a to 6d are the same as those of the above-described embodiment. The same parts as those of the above-described embodiment are denoted by the same reference numerals, and the detailed description is omitted.

As shown in FIG. 4, the pickup coil unit 9 includes three projections 23a to 23d disposed between two adjacent power supply lines of the four power supply lines 6a to 6d.
c, and three pickup coils 13 wound around the projections 23a to 23c. Each of the projections 23a to 23c is protruded at equal intervals,
Each of the pickup coils 13 has the same winding direction and the same number of turns. The pickup coil unit 9 is attached to the carrier 1 at the same position as the pickup coil unit 9 of the above-described embodiment.
Used in a fixed state via

The magnetic flux S generated when an alternating current flows through the power supply line 6 is generated between the first and second power supply lines 6a and 6b and between the first and second power supply lines 6a and 6b.
Convex portion 23 located between the fourth and fourth power supply lines 6c and 6d
a and 23c pass in the same direction, and pass through the projection 23b located between the second and third feeder lines 6b and 6c in the opposite direction. Since the pickup coil 13 wound around each of the protrusions 23a to 23c has the same winding direction, the induced electromotive force generated in the pickup coil 13 wound around the protrusions 23a and 23c and the winding around the protrusion 23b. The induced electromotive force generated in the turned pickup coil 13 has a phase of 1 as shown in FIGS. 5 (a) and 5 (b).
The state is shifted by 80 °. When the pickup coils 13 are simply connected in series, the output of the pickup coil 13 wound around the projection 23b cancels the output of the other pickup coils 13, and the total output voltage is one pickup coil. 13 is the same as the output voltage. Therefore, the three pickup coils 13 are connected so that their output voltages have the same phase. That is, the pickup coils 13 wound around the projections 23a and 23c are connected in series with each other, and the pickup coil 13 wound around the projection 23b is connected in series with the opposite direction. As a result, three pickup coils 13
Can obtain an output voltage that is approximately three times the output voltage from one pickup coil 13.

In the pickup coil unit 9 shown in FIG. 4, only the protrusions 23a to 23c for winding the pickup coil 13 are projected from the core 23, but as shown by a chain line in FIG. When the protrusions 23d for guiding the magnetic flux are formed at both ends, the magnetic flux S generated by the alternating current flowing through the power supply lines 6a, 6d causes the protrusions 23a, 23
c. Therefore, the presence of the convex portion 23d allows the magnetic flux S to interlink with the pickup coils 13 wound around the convex portions 23a and 23c more efficiently, thereby generating an induced electromotive force more efficiently.

Third Embodiment Next, a third embodiment will be described with reference to FIGS. In this embodiment, the arrangement of the power supply lines 6a to 6d, the configuration of the pickup coil unit 9, and the number of pickup coils 13 that can be wound around one pickup coil unit 9 are different from those of the above-described embodiments. Other configurations of the devices 8, 14 and the like are the same as those of the above-mentioned embodiments. The same parts as those of the above-described embodiment are denoted by the same reference numerals, and the detailed description is omitted.

As shown in FIG. 6 and FIG.
6d are arranged so that a total of four lines are arranged at substantially equal intervals vertically. That is, in this embodiment, the plurality of power supply lines 6a to 6d are arranged so as to be located on two surfaces along the guide rail 2 (not shown). The pickup coil unit 9 has a core 24 having four projections 24a to 24d so as to have a substantially cross-shaped cross section, and is wound around two projections 24a and 24c of the core 24, respectively, and has an output voltage. And a pickup coil 13 connected so as to have the same phase.

The shapes of the projections 24a to 24d are, for example, a flat plate as shown in FIG.
And a T-shaped section as shown in FIG. The core 24 shown in FIG. 7A is, for example, assembled with two flat plate cores 25 each having a notch 25a as shown in FIG. 8A, or two cores as shown in FIG. 8B. It is formed by joining a T-shaped core 26.

The four power supply lines 6a to 6d are, as shown by chain lines in FIG. 7A, a bracket 27 made of an insulator having four support arms 27a extending horizontally from the left and right sides of the power supply lines 6a to 6d. And is supported by the guide rail 2 via. The pickup coil unit 9 is used by being attached to the carrier 1 such that the center of the cross of the core 24 having a substantially cruciform cross section is located substantially at the center of the four power supply lines 6a to 6d. The pickup coil unit 9 is attached to the transport trolley 1 via a bracket that supports the convex portion 24c extending downward.

In order to arrange all the power supply lines 6a to 6d so as to be located on one plane, it is necessary to secure a wide space vertically or horizontally. However, in this embodiment, the even-numbered power supply lines 6a to 6d are arranged so as to be located on two surfaces along the guide rail. Therefore, even if it is not possible to secure a wide space in both the vertical and horizontal directions, the power supply lines 6a to 6d can be arranged. Also in this embodiment, since the power supply line 6 is not arranged in a coil shape, the inductance of the power supply line is smaller than when the power supply line 6 is arranged in a coil shape.

The pickup coil unit 9 has two protrusions 24a to 24d formed on one core 24, and the two protrusions 24a to 24d are arranged so that currents flow in opposite directions to each other. Used in a state where it is arranged between the power supply lines. As shown in FIGS. 7A and 7B, the output when the two pickup coils 13 are wound is twice the output voltage of one pickup coil 13,
By changing the number of pickup coils 13 wound around the protrusion, it is possible to obtain an output voltage that is four times the output voltage of at most one pickup coil.

Even when four pickup coils 13 are wound, the size of the pickup coil unit 9 is the same as when a smaller number of pickup coils 13 are wound, and the power receiving unit can be downsized. Therefore, even with the same number of power supply lines 6a to 6d, the primary current or the length of the core 24 can be reduced in extracting the same magnitude of the secondary voltage as compared with the above-described embodiments. Further, when the primary current having the same size or the core 24 having the same length is used, the line length can be made longer.

The present invention is not limited to the above embodiment, but may be embodied as follows, for example. (1) As in the first and second embodiments, when all the power supply lines are arranged so as to be located on one surface along the guide rail 2, the number of power supply lines is not limited to four. If it is an even number, it may be six or more. For example, the power supply line 6 may be bent and wired so that the six power supply lines 6a to 6f are parallel as shown in FIG. In this case, when the same pickup coil unit 9 as that of the first embodiment is used, the three pickup coil units 9 are adjacent to each other and form a pair of feeder lines 6a, 6b, and 6 as shown by a chain line.
It is used in a state where it is arranged at a position corresponding to c, 6d, 6e, 6f. Then, by connecting the pickup coils 13 in series, one pickup coil 1 is connected.
Thus, an output voltage three times as large as the output voltage of No. 3 can be obtained. Further, when the pickup coil unit 9 having the configuration in which the pickup coils 13 are all arranged between the adjacent power supply lines as in the second embodiment is used, the output voltage of one pickup coil 13 is five times the output voltage. An output voltage can be obtained.

(2) When all the power supply lines are arranged so as to be located on one surface along the guide rail 2, as in the first and second embodiments and (1), each power supply line is used. Instead of arranging them vertically, they may be arranged side by side on a horizontal plane. This configuration is effective when it is difficult to secure a space in the vertical direction, for example, in a place where the ceiling is low.

(3) In the second embodiment, the winding direction of the pickup coil 13 wound around the protrusion 23b projecting from the center of the core 23 is made opposite to that of the other pickup coils 13. In this case, since the direction of the magnetic flux S interlinking with the pickup coil 13 is opposite to that of the other pickup coils 13, the phase of the output voltage is the same as the output voltage of the other pickup coils 13, and the three pickup coils 13 Are simply connected in series, a triple output voltage can be obtained. Similarly, when the number of power supply lines is an even number of 6 or more, by making the winding directions of the pickup coils 13 wound around the adjacent protrusions be opposite to each other, the output voltages of all the pickup coils are reduced. The phases are the same.

(4) As in the third embodiment, in the configuration in which the even number of power supply lines are arranged on two surfaces along the guide rail, the number of power supply lines is four. The number is not limited to six, and may be six or more if it is an even number. Also in this case, the number of protrusions becomes the same as the number of power supply lines, and if pickup coils are wound around all the protrusions, the maximum output voltage becomes N times the output voltage of one pickup coil (N is the supply voltage). Number of electric wires).

(5) Instead of the unmanned transport system using the transport vehicle 1 traveling on the guide rail 2 erected on the ceiling, an unmanned transport system using the transport vehicle traveling on the guide rail laid on the ground or an automatic It may be applied to a stacker crane in a warehouse.

(6) The output of the power supply device 8 on the ground side is set to 20
It may be other than 0 V and 10 kHz. (7) The material of the core may be a material other than ferrite.

(8) The position at which the pickup coil is attached to the moving body is not limited to the same position in the moving direction of the moving body, but may be at least partially overlapped with the moving direction of the moving body. In addition, the space required for mounting the pickup coil can be reduced in the moving direction of the moving body by the length of the overlap.

The inventions other than those described in the claims which can be grasped from the embodiment and the modified examples will be described below together with their effects. (1) In the invention according to claim 8, a pickup coil is wound around all the projections. In this case, four pickup coils can be wound around one core, and an output voltage four times that of a normal pickup coil can be obtained.

[0062]

As described in detail above, claims 1 to 6 are provided.
In the invention described in the above, when using the feed line of the same withstand voltage,
Compared to the case where the power supply line is arranged in a coil shape, the line length, that is, the traveling path of the moving body can be made longer with one power supply device 8. In addition, compared to the conventional device in which the power supply line is not arranged in a coil shape, the required power supply capacity can be secured with a smaller primary current,
If the primary current is the same, a shorter pickup coil unit can be used.

According to the second aspect of the present invention, since the power supply line is arranged so as to be located on one surface along the guide rail, the power supply line is arranged so as to be located on two different surfaces. In this case, the support of the power supply line and the attachment of the pickup coil to the moving body are facilitated as compared with the case of the first embodiment.

According to the third aspect of the present invention, since the phases of the output voltages of the two pickup coils are the same, simply connecting the two pickup coils in series makes it possible to reduce the output voltage of each pickup coil by a factor of two. Output can be extracted.

According to the fourth and seventh aspects of the present invention,
One pickup coil unit can arrange pickup coils of a number one less than the number (2n) of power supply lines arranged in parallel at a predetermined position, and an output voltage of (2n-1) times the output of one pickup coil. Is obtained.

According to the fifth aspect of the present invention, even if it is not possible to secure a wide space in both the vertical direction and the horizontal direction, the power supply line can be arranged. According to the sixth and eighth aspects of the present invention, since four pickup coils can be wound around one core, the output of one pickup coil can be set by setting the number of wound pickup coils. An output voltage up to four times the voltage can be obtained.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an arrangement of power supply lines and a power supply device according to a first embodiment.

FIG. 2 is a front view of a transfer cart.

FIG. 3 is a schematic side view of a pickup coil unit.

FIG. 4 is a schematic side view of a pickup coil unit according to a second embodiment.

FIG. 5 is a graph showing a change in output voltage of a pickup coil.

FIG. 6 is a schematic perspective view illustrating an arrangement of a power supply line according to a third embodiment.

7A is a schematic side view of a pickup coil unit, and FIG. 7B is a schematic side view of a pickup coil unit having a core having another shape.

8A is an exploded perspective view of a core, and FIG. 8B is an exploded front view of the core.

FIG. 9 is a schematic side view showing the arrangement of power supply lines according to a modification.

FIG. 10 is a schematic side view of a conventional pickup coil unit.

[Explanation of symbols]

1 ... Conveyor truck as a moving body, 2 ... Guide rail, 6,6
a, 6b, 6c, 6d, 6e, 6f: power supply line, 8: power supply device, 9: pickup coil unit, 12, 23,
24 core, 13 pickup coil, 23a to 23
c, 24a to 24d: convex portion, S: magnetic flux.

Claims (8)

[Claims] An electric power used by a moving body that moves along a guide rail is supplied via a pickup coil that generates an induced electromotive force based on an alternating current supplied to a power supply line wired along the guide rail. A non-contact power supply system for supplying a moving object, wherein four or more even-numbered power supply lines are arranged in parallel with each other at a predetermined interval in a movement range of the pickup coil, and flow through adjacent power supply lines. One power supply line is bent and wired so that the direction of the current is reversed.
Each of the pickup coils is attached to the moving body so as to be arranged at a position where at least a part thereof overlaps with the moving direction of the moving body between two adjacent feeding lines of the even number of feeding lines, A non-contact type power supply system for a moving object with a pickup coil connected so that its output voltage is in phase. 2. The power supply system according to claim 1, wherein the even number of power supply lines are disposed on one surface along the guide rail.
4. A non-contact power supply system for a moving object according to claim 1. 3. The power supply line is arranged so that four power supply lines are arranged vertically or horizontally, and two pickup coils move via different cores so as to be located between two different power supply lines. The non-contact power supply system for a moving body according to claim 2, wherein the two pickup coils are attached to the body and are connected in series with each other. 4. The even-numbered feeder lines are arranged so as to be arranged in the vertical or horizontal direction, and one of the pickup coils is one less than the number of the feeder lines so as to be located between adjacent feeder lines. The non-contact power supply system for a moving body according to claim 2, wherein the system is attached to the moving body in a state of being wound around a convex portion protruding from the core. 5. The power supply system according to claim 1, wherein the even number of power supply lines are disposed on two surfaces along the guide rail.
4. A non-contact power supply system for a moving object according to claim 1. 6. The power supply lines are arranged so that a total of four power supply lines are vertically arranged two by two at substantially equal intervals, and a core having a substantially cruciform cross section is located at substantially the center of the four power supply lines. 6. A pickup coil is wound around at least two projections of the core in such a manner that the pickup coil is wound around the movable body.
4. A non-contact power supply system for a moving object according to claim 1. 7. A pickup coil unit used in the non-contact power supply system for a moving body according to claim 4, wherein the three protrusions for winding the pickup coil are projected in parallel. And a pickup coil wound around each of the convex portions of the core and connected so that output voltages thereof have the same phase. 8. A pickup coil unit used in the non-contact power supply system for a moving object according to claim 6, wherein the core has four convex portions so as to have a substantially cruciform cross section. A pickup coil unit comprising: a pickup coil wound around at least two protrusions of a core and connected so that output voltages thereof have the same phase.