JPH1023689A - Pick-up coil unit for non-contact power feeding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pick-up coil unit easy to assemble, along with a feeding capacity easy to change. SOLUTION: A pick-up coil unit 9 is made up of a core 12 with an E-shaped cross section, and a pick-up coil 13 is turned around the core 12. The pick-up coil 12 is turned at a central projected part 12a. In the core 12, a plurality of core pieces 14 is bonded with an adhesive so that E-shaped faces of the core pieces 14 are fitted to each other. The number of the core pieces 14 to be joined, and the turned number of the coil 13 are selected, according to the feeding capacitor of the pick-up coil unit 9. The core piece 14 has a positioning projected part 14a and a positioning processed part on a face, to be joined to another core piece 14. The positioning projected part 14a is fitted to the positioning recessed part, so that the core pieces 14 are joined to each other in an accurate position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickup coil unit of a non-contact type power feeding device.

[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 via a power supply line (power trolley line) through which a 200 V alternating current 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 method 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, 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.

In general, a pickup coil used in this type of non-contact method is wound around a ferrite core. If the core is formed by cutting from a ferrite block, the processing cost is increased. Therefore, the plate material is joined and wound around a core formed to have a predetermined length and a predetermined cross-sectional shape. For example, Japanese Unexamined Patent Publication No. Hei 6-311603 discloses that, as shown in FIG. 9, a plurality of resin blocks 51 each having an E-shaped cross section are screwed into (Not shown) and block 5
A gap member 53 is interposed between the end face 1 and the U-shaped frame 52. Then, each concave portion 51a of the block 51
A ferrite plate 54a is arranged on the bottom of the block 51, a ferrite plate 54b is arranged on the side surface of each concave portion 51a, and a ferrite plate 54c is arranged on the tip of the convex portion 51b of the block 51 so as to extend in the direction perpendicular to the plane of the drawing.
Fixed to 1. Further, a pickup coil 55 is formed by winding a litz wire of 10 to 20 turns on the outside so as to straddle a pair of ferrite plates 54b fixed to both side surfaces of the central convex portion 51b. The open side of the U-shaped frame 52 is covered with a resin cover 56.

Japanese Patent Application Laid-Open No. 6-153305 discloses that five ferrites 57 each having an E-shaped cross section are arranged as shown in FIGS.
A core is disclosed in which a ferrite plate 58 is mounted on a base 7a, and each ferrite 57 is fixed together with a ferrite plate 58 to a base body 60 at a predetermined interval by a screw 61 via a nonmagnetic plate 59. The ferrites 57 are arranged with a gap therebetween, and 10 to 20 are arranged outside the core.
The litz wire of the turn is wound and the pickup coil 62
Are formed. And it is configured to be attached to the moving body via an attaching member 63 fixed to the outer surface of the base body 60.

[0006]

The induced electromotive force generated by the pickup coil changes depending on the length of the core if the number of turns of the pickup coil and the current flowing through the feeder line are the same. That is, cores having different lengths are required according to the power supply capacity of the pickup coil unit. In the core disclosed in Japanese Patent Application Laid-Open No. 6-31603, a plurality of ferrite plates 54a to 54c are joined to each other via a resin block 51 and screws, and are formed in a predetermined length and in a predetermined shape. Therefore, when cores of different lengths are required, it is necessary to prepare ferrite plates 54a to 54c of different lengths corresponding to the cores.
The manufacturing cost of 54c is increased. Further, when a ferrite plate having a large shape is manufactured, the manufacturing cost is further increased. As a result, the manufacturing cost of the pickup coil unit also increases. Further, since the magnetic flux passing through the ferrite plates 54a to 54c passes through the joints of the ferrite plates 54a to 54c, a part of the magnetic flux leaks and the characteristics are inferior to those of the integrated ferrite core.

On the other hand, JP-A-6-153305 does not disclose that the power supply capacity of the pickup coil unit can be changed by changing the number of ferrites 57, but the ferrite 57 fixed to the base body 60 is not disclosed. The power supply capacity of the pickup coil unit can be changed by increasing or decreasing the number. Therefore, the power supply capacity of the pickup coil unit can be changed by increasing or decreasing the number of ferrites 57 having the same shape, and only one type of die is required to manufacture the ferrites 57. However, the plate 59 and the base body 6
It is necessary to prepare a length 0 corresponding to the increase or decrease of the number of ferrites 57. In addition, since the ferrites 57 are arranged with a gap therebetween, it is necessary to fix the respective ferrites 57 with the screws 61 via the ferrite plate 58, and there is a problem that the assembling is troublesome.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a pickup coil unit of a non-contact type power supply device which is easy to assemble and easily changes the power supply capacity of the pickup coil unit. Is to do.

[0009]

According to one aspect of the present invention, there is provided a pickup coil unit for generating an induced electromotive force based on a current supplied to a power supply line. A core around which the coil was wound was assembled in a state where a plurality of core pieces having the same cross-sectional shape in a plane orthogonal to the power supply line when the pickup coil unit was arranged at a predetermined position with respect to the power supply line were joined to each other.

[0010] In the invention described in claim 2, the number of the joined core pieces is selected according to the power supply capacity of the pickup coil unit. According to a third aspect of the present invention, in the first or second aspect of the present invention, the core piece is formed by molding a ferrite powder into a predetermined shape using a mold, and then firing the molded product.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the core piece has a substantially E-shaped cross section and a central projection. A pickup coil is wound around the section.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, a positioning portion is formed on the core piece at a joint surface with another core piece.

The pickup coil unit according to the first to fifth aspects of the present invention is used by being mounted on a moving body that moves along a guide rail, for example, so as to be located near a power supply line. Then, when an alternating current flows through the power supply line, an induced electromotive force is generated in the pickup coil based on a magnetic flux generated around the power supply line, and is used as a power source for the moving body. Since the core around which the pickup coil is wound is formed by joining a plurality of core pieces having the same cross-sectional shape, the cores having different sizes (lengths) can be easily changed by changing the number of joined core pieces having the same shape. It is formed. Because each core piece will be in a state joined to each other,
When the mounting member is used, the entire core piece is fixed to the mounting member by fixing the core pieces located at both ends with screws or the like.

According to the second aspect of the invention, the number of core pieces to be joined is changed according to the power supply capacity of the pickup coil unit. When the number of core pieces is increased, the power supply capacity of the pickup coil unit increases, and when the number of core pieces is reduced, the power supply capacity of the pickup coil unit decreases.

According to the third aspect of the present invention, the core piece is formed by molding ferrite powder into a predetermined shape in a mold and then firing. According to the fourth aspect of the present invention, in the pickup coil unit, the pickup coil is wound around a central projection of a core having a substantially E-shaped cross section. Therefore, for example, when the power supply line is used in a state where the power supply line is located in the concave portions located on both sides of the central protrusion, the magnetic flux generated from the power supply line efficiently passes through the core.

According to the fifth aspect of the present invention, the respective core pieces are joined to each other in a state where they are positioned via the positioning portions formed on the joint surface with the other core pieces. Therefore, a plurality of core pieces are accurately joined.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One 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 will be described with reference to FIGS. .

As shown in FIG. 3, 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, power supply lines 6 a and 6 b made of a litz wire are provided via a pair of upper and lower support arms 7 arranged on the opposite side to the surface of the guide rail 2 facing the drive wheel 3. They are arranged vertically in parallel. Power supply lines 6a, 6b
Is a reciprocating line as shown in FIG. 5, in which the feeder line 6a arranged on the upper side is on the outward path, and the feeder line 6b is arranged on the lower side.
Is returning. The start and end of the feed lines 6a and 6b are connected to a power supply 8 installed on the ground. Then, the power supply device 8 supplies AC power to the power supply lines 6a and 6b. In this embodiment, the AC power supplied from the power supply device 8 is a power supply having a high frequency sine waveform of 200 V and 10 kHz.

As shown in FIG. 3, a pair of front and rear pickup coil units 9 are arranged on the carrier 1 so as to face the power supply lines 6a and 6b. 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. The pickup coil unit 9 has an upper power supply line 6a (outbound path) between the upper protrusion 9a and the center protrusion 9b, and a center protrusion 9b and a lower protrusion 9b.
The supporting bracket 10 supports the lower feeder line 6b (return path) between the support bracket 10 and the power supply line 6c.

As shown in FIG. 1, the pickup coil unit 9 comprises a feed line 6
feeding line 6 when placed at a predetermined position with respect to a, 6b
a, and a pickup coil 13 wound around the core 12 and having a substantially E-shaped cross section in a plane orthogonal to a and 6b.
It is composed of The pickup coil 13 is wound around the central projection 12a of the core 12.

The core 12 is assembled by bonding and fixing the E-shaped surfaces of the plurality of core pieces 14 via an adhesive in a state where the E-shaped surfaces are in contact with each other. The number of core pieces 14 joined and the number of turns of the pickup coil 13 are selected according to the power supply capacity of the pickup coil unit 9.

The core piece 14 has a positioning portion formed on a joint surface (contact surface) with another core piece 14. As shown in FIG. 1, a cylindrical positioning projection 14a is formed on the first surface as a positioning part. As shown in FIG. 2, a positioning recess 14b having a shape corresponding to the positioning projection 14a is formed on the second surface. The positioning projections 14a and the positioning recesses 14b are fitted together so that the respective core pieces 14 can be joined in a correctly positioned state.

The core piece 14 is formed by molding ferrite powder into a predetermined shape in a mold and then firing. The positioning protrusion 14a and the positioning recess 14b are formed during this molding. The peripheral surfaces of the positioning projection 14a and the positioning recess 14b are formed in a slightly tapered shape so that the mold can be easily removed.

FIG. 5 shows an electric circuit of the power supply unit 8 on the ground side for supplying high-frequency power to the power supply lines 6a and 6b and the power supply unit 15 mounted on the carrier 1. The power unit 8 on the ground side is AC
The AC / DC conversion circuit 16 converts the 200 V, 60 Hz three-phase AC power supply 17 into a 200 V DC power supply. The DC power converted by the AC / DC conversion circuit 16 is supplied to the DC / AC conversion circuit 18.

The DC / AC conversion circuit 18 comprises a first drive circuit section 18a and a second drive circuit section 18b. Both drive circuit sections 18a and 18b are connected to the AC / DC conversion circuit 16 in parallel with each other. The output terminal of the first drive circuit section 18a is connected to the starting ends of the power supply lines 6a and 6b via a capacitor 19 for resonance. The output terminal of the second drive circuit unit 18b is
The power supply lines 6a and 6b are connected to the ends.

The first drive circuit section 18a includes two upper transistors T1 and T2 and two lower transistors T3 and T2.
The collectors of the upper transistors T1 and T2 are connected to the positive pole side of the AC / DC conversion circuit 16, and the emitters of the lower transistors T3 and T4 are connected to the negative pole side of the AC / DC conversion circuit 16. . The emitters of the upper transistors T1 and T2 and the lower transistor T
3, the connection point between the collector of T4 and the collector of the first drive circuit 18
a output terminal.

The second drive circuit 18b comprises two upper transistors T5 and T6 and two lower transistors T7 and T6.
The collectors of the upper transistors T5 and T6 are connected to the positive pole of the AC / DC converter 16, and the emitters of the lower transistors T7 and T8 are connected to the negative pole of the AC / DC converter 16. . The emitters of the upper transistors T5 and T6 and the lower transistor T
7, the connection point between the collector of T8 and the second drive circuit 18
b output terminal.

Each of the transistors T1 to T8 is turned on / off by a controller (not shown), and supplies electric power having a high-frequency sine waveform of 200 V and 10 kHz to the power supply lines 6a and 6b. Incidentally, the upper transistors T1 and T2 of the first drive circuit section 18a and the lower transistors T7 and T8 of the second drive circuit section 18b are synchronously turned on and off, and the first drive circuit section 18a The lower transistors T3, T4 and the upper transistors T5, T6 of the second drive circuit section 18b are ON / OFF controlled in synchronization. When the upper transistors T1, T2 and the lower transistors T7, T8 are on, the lower transistors T3, T4
And the upper transistors T5 and T6 are turned off, and conversely,
Upper transistors T1, T2 and lower transistors T7,
When T8 is off, the lower transistors T3, T4 and the upper transistors T5, T6 are controlled to be on.

The power supply device 15 mounted on the transport vehicle 1 has a rectifier circuit 20. The rectifier circuit 20 has an input terminal connected to a series circuit of the pickup coil 13 and a capacitor 21 for adjusting output. The output terminal of the rectifier circuit 20 is connected to the traveling motor 5 via the inverter 22. A smoothing capacitor 23 is connected between the rectifier circuit 20 and the inverter 22. The inverter 22 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 22 based on a command from an operation control device (not shown). Then, the drive of the traveling motor 5 is controlled via the inverter 22, and the transport trolley 1 moves along the guide rail 2, and the load is transported between predetermined stations.

The power supply lines 6a and 6b
0 V, 10 kHz high frequency sinusoidal power is supplied. Then, a magnetic flux is generated around each of the power supply lines 6a and 6b, and an induced electromotive force is generated in the pickup coil 13 disposed close to each of the power supply lines 6a and 6b. The induced electromotive force generated by the pickup coil 13 is converted to direct current by the rectifier circuit 20, smoothed by the smoothing capacitor 23, and output to the inverter 22. And the inverter 22
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 feeder lines 6 a and 6 b (primary coils) disposed along the guide rail 2 and the pickup coil 13 (secondary coil) wound around the core 12 mounted on the carrier 1. Power is supplied to the carrier 1 in a non-contact manner. A primary current and an electromotive force having a voltage proportional to the inductance of the secondary coil are obtained from the pickup coil 13.

As shown in FIG. 4, the directions of the currents flowing through the two feeder lines 6a and 6b provided so as to sandwich the central projection 9b of the pickup coil unit 9 are opposite to each other, and the two feeder lines 6a and 6b The directions of the magnetic fluxes S generated around are opposite to each other as shown by arrows. However, since the wound central projection 9b of the pickup coil 13 is located between the two feed lines 6a, 6b, the two feed lines 6a, 6b
And the direction of the magnetic flux S passing through the central protruding portion 9b is the same.
The induced electromotive force is efficiently generated by the change in the magnetic flux generated from b.

The inductance of the secondary coil is proportional to the length of the core 12, that is, the number of core pieces 14 joined to form the core 12. Accordingly, if the inductance of one core piece 14 is L0, n pieces are n
L0, and the inductance can be easily changed depending on the number of junctions.

When a large output current is required, it is necessary to use a wire having a large diameter as the element wire of the pickup coil 13. If the number of turns is increased by using a wire having a large diameter, the cross-sectional area of the pickup coil 13 increases,
The distance between the pickup coil 13 and the upper protrusion 9a and lower protrusion 9c of the pickup coil unit 9 is reduced. Therefore, it is difficult to arrange the power supply lines 6a and 6b at predetermined positions without changing the size of each core piece 14. However, the output voltage of the secondary coil (pickup coil unit 9) is not a function of the number of core pieces 14 only,
It is also a function of the number of turns of the pickup coil 13.
Therefore, by reducing the number of turns and increasing the number of core pieces 14, a secondary coil having the same output voltage can be obtained. Since the output voltage of the secondary coil is also proportional to the number of turns of the pickup coil 13, if the inductance value when one core piece 14 is known, the output voltage of the pickup coil unit 9 is determined by the number of joined core pieces 14 and the number of turns. Can be calculated, and the design of the pickup coil unit 9 becomes easy.

This embodiment has the following effects. (B) Core 12 around which pickup coil 13 is wound
Is formed by joining a plurality of core pieces 14 having the same cross-sectional shape, the cores 12 having different sizes (lengths) can be easily formed by changing the number of joined core pieces 14 having the same shape. When the number of core pieces 14 is increased, the power supply capacity of the pickup coil unit 9 increases, and when the number of core pieces 14 is reduced, the power supply capacity of the pickup coil unit 9 decreases. Therefore, it is easy to produce the pickup coil units 9 having different power supply capacities and sizes, and it is easy to apply the pickup coil units 9 to various types.

(B) The cross-sectional area of the pickup coil wound on the core 12 is increased by changing both the number of core pieces 14 joined and the number of turns of the pickup coil 13 by changing the power supply capacity of the pickup coil unit 9. A large-diameter wire can be used without the need. As a result, even when the current value used in the load is large, it can be handled without changing the shape of the core piece 14.

(C) Each core piece 14 is joined to each other while being positioned via a positioning projection 14a and a positioning recess 14b formed on a joint surface with another core piece 14. Therefore, the plurality of core pieces 14 can be joined with high accuracy.

(D) 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, 6b arranged so as to sandwich the pickup coil 13. Are used in a state where currents flow in opposite directions to each other. Accordingly, the magnetic flux S generated from the power supply lines 6a and 6b efficiently passes through the core 12, and the direction of the magnetic flux S generated from both the power supply lines 6a and 6b becomes the same when passing through the pickup coil 13. Therefore, the induced electromotive force is efficiently generated by the magnetic flux S linked to the pickup coil 13.

(E) The core 12 includes a plurality of core pieces 14
However, since the direction in which the magnetic flux flows is in a plane parallel to the joining surface of each core piece 14, there is some gap between each core piece 14 or the presence of an adhesive layer. However, since there is no magnetic flux flowing in the direction traversing the gap or the adhesive layer, characteristics equivalent to those of an integrated core formed by cutting from a ferrite block can be obtained.

(F) Since the core piece 14 is not so thick, it can be formed by molding ferrite powder into a predetermined shape in a mold and then firing. Therefore, even when the step of forming the core 12 by assembling the plurality of core pieces 14 is included, the yield is improved and the manufacturing cost is reduced as compared with the case where the core is formed by cutting from the ferrite block. Also, the manufacturing cost is lower than when ferrite plates having different lengths are prepared and cores having different lengths are formed.

(G) Since the plurality of core pieces 14 are bonded to each other by the adhesive, the winding operation of the pickup coil 13 can be performed without being attached to the attachment member 11.

The present invention is not limited to the above embodiment, but may be embodied as follows, for example. (1) Instead of the shape of the core piece 14 in the above-described embodiment, for example, as shown in FIG. The protrusions 14c are formed at both ends of the connecting portion located on the base end side of each protrusion. Also, the positioning section is omitted. In this case, each of the core pieces 14 is joined by an adhesive, and the pickup coil 13 is separately wound around the connecting portions located on both sides of the central convex portion. Pickup coil 1
The total number of turns 3 is twice as large as that of the above-described embodiment when the power supply capacity is the same. In this case, the divided pickup coil 13 has a feed line 6a serving as a forward path of the supply current.
And one of the magnetic fluxes S generated from the feed line 6b on the return path are linked. Then, the total amount of the magnetic flux linked to both pickup coils 13 is equal to that of the above-described embodiment. Therefore, the induced electromotive force generated in the pickup coil unit 9 is also equal.

In the case of this example, the central projection 12a of the core 12
Feeding lines 6a and 6b are arranged between the upper and lower protrusions 9a and 9c of the pickup coil unit 9. Therefore, unlike the case of the above-described embodiment, it is not necessary to secure a winding margin of the pickup coil 13, and the height H of the core 12 can be reduced. Also, the core piece 1 is attached to the mounting member 11.
4. A holding portion 11 for holding the protrusions 14c protruding from both ends of the holding member 4.
Forming a facilitates attachment of the pickup coil unit 9 to the support bracket 10 via the attachment member 11.

(2) As shown in FIG. 6B, as a positioning portion formed on the core piece 14, the core piece 14
A plurality of holes 14d extending in the thickness direction are formed. When joining a plurality of core pieces 14, a stick is inserted into the hole 14d, and the core pieces 14 to which the adhesive is applied are moved along the stick and joined to each other. Then, after the bonding of the core pieces 14 is completed, the rod is removed.

Further, as shown in FIG. 7, instead of a rod, a bolt 24 is inserted so as to pass through each hole 14d of a predetermined number of core pieces 14, and a nut 25 is screwed to the tip thereof to tighten the core piece 14. It may be fixed. In this case, no adhesive is required.

(3) Positioning projections 14a and positioning recesses 14b may be formed on both surfaces of the core piece 14, respectively. (4) As in the embodiment and (3), when positioning portions are provided which engage with each other in an uneven relationship, the core pieces 14 located at both ends of the core pieces 14 in a state where a predetermined number of core pieces 14 are assembled are screwed or the like. By fixing to the mounting member 11, the entire core piece 14 is fixed to the mounting member 11. Therefore, it is not necessary to use the same number of screws as the number of the core pieces 14, and the time required for fixing to the mounting member 11 is simplified.

(5) The number of power supply lines may be one, or the shape of the core piece 14 may be a shape other than the E-shaped cross section, for example, a C-shaped shape as shown in FIG. (6) 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 a transport vehicle traveling on the guide rail laid on the ground, or an automatic warehouse stacker May be applied to cranes.

(7) Instead of folding one electric wire and arranging the feed lines 6a and 6b for the forward path and the return path in parallel with each other in a state of approaching each other, the two feed lines are based on the current flowing therethrough. The generated magnetic fluxes are arranged at intervals such that they do not interfere with each other, and currents flow in the same direction.
In addition, the pickup coils 13 are disposed on the transport trolley 1 so as to be able to pass through positions where magnetic fluxes generated around one of the feeder lines pass.

(8) 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. (9) Instead of providing a pair of pickup coil units 9 in the front and rear of the carrier 1, only one pickup coil unit or three or more pickup coil units 9 are provided, and the pickup coils 13 wound around each pickup coil unit 9 are connected in series. Is also good.

(10) The material of the core piece 14 may be a material other than ferrite. The inventions other than those described in the claims that 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 5,
The positioning portion is configured by a combination of a positioning concave portion and a positioning convex portion. In this case, since the core pieces are joined to each other by the engagement of the positioning portions without the auxiliary member, the core pieces located at both ends thereof are fixed to the mounting member with screws or the like in a state where a predetermined number of core pieces are assembled, so that the whole Are fixed to the mounting member. Therefore, it is not necessary to use the same number of screws as the number of the core pieces, and the time and effort for fixing to the mounting member are simplified.

(2) In the invention according to claim 5,
The positioning portion is a plurality of holes formed so as to extend in the thickness direction of the core piece. In this case, the positioning of each core piece can be easily performed by inserting an auxiliary member such as a rod into the hole.

(3) Any one of claims 1 to 3
In the invention described in the paragraph, the core is formed to have a substantially E-shaped cross section, and a pickup coil is wound around connecting portions located on both sides of the central protrusion. In this case, unlike the case where the pickup coil is wound around the central protrusion,
It is not necessary to secure the winding margin of the pickup coil, and the height of the core can be reduced.

[0056]

As described in detail above, claims 1 to 5 are provided.
According to the invention described in (1), the assembling is simple and the power supply capacity of the pickup coil unit can be easily changed.

According to the second aspect of the present invention, the power supply capacity of the pickup coil unit can be easily changed by changing the number of core pieces bonded. According to the third aspect of the present invention, since the ferrite powder is formed into a predetermined shape using a mold and then fired, the ferrite powder is cut from the ferrite block even if a step of assembling a plurality of core pieces to form a core is included. Thereby, the yield is improved and the manufacturing cost is reduced as compared with the case where a core is formed.

According to the fourth aspect of the present invention, when the power supply line is used in a state where the power supply line is located in, for example, the concave portions located on both sides of the central protrusion, the magnetic flux generated from the power supply line passes through the core efficiently. When the power supply lines are used in a state where currents flow in opposite directions, induced electromotive force is efficiently generated by magnetic fluxes generated from both power supply lines.

According to the fifth aspect of the present invention, each core piece is joined to each other in a state where it is positioned via a positioning portion formed on a joint surface with another core piece, and a plurality of core pieces can be joined with high accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a pickup coil unit.

FIG. 2 is a perspective view of a core piece.

FIG. 3 is a front view of the transport vehicle.

FIG. 4 is a schematic view showing the operation.

FIG. 5 is a circuit diagram illustrating a configuration of a power supply device.

FIG. 6A is a schematic side view of a pickup coil unit of a modified example, and FIG. 6B is a perspective view of a core piece of another modified example.

FIG. 7 is a front view of a pickup coil unit of another modification.

FIG. 8 is a side view of a core piece according to another modification.

FIG. 9 is a sectional view showing a conventional apparatus.

FIG. 10 is a front view showing another conventional apparatus.

FIG. 11 is a side view of the same.

[Explanation of symbols]

6a, 6b: power supply line, 9: pickup coil unit, 12: core, 13: pickup coil, 14 ...
Core pieces, 14a: positioning projections as positioning portions, 14b: positioning recesses as positioning portions.

Claims (5)

[Claims] 1. A pickup coil unit for generating an induced electromotive force based on a current supplied to a power supply line, wherein a core around which a pickup coil is wound is disposed at a predetermined position with respect to the power supply line. A pickup coil unit of a non-contact type power supply device in which a plurality of core pieces having the same cross-sectional shape in a plane orthogonal to a power supply line when assembled are assembled in a state of being joined to each other. 2. The pickup coil unit of the non-contact type power supply device according to claim 1, wherein the number of the core pieces to be joined is selected according to the power supply capacity of the pickup coil unit. 3. The pickup coil unit for a non-contact power supply device according to claim 1, wherein the core piece is formed by molding a ferrite powder into a predetermined shape using a mold and then firing. 4. The core piece has a cross-sectional shape of substantially E
The pickup coil unit of the non-contact type power supply device according to any one of claims 1 to 3, wherein the pickup coil unit is formed in a shape of a letter, and a pickup coil is wound around a central protrusion thereof. 5. The pickup coil unit for a non-contact power supply device according to claim 1, wherein a positioning portion is formed on the core piece at a joint surface with another core piece.