JP2000152403A - Noncontact power feeding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noncontact power feeding system allowable of a variation in frequency of a current fed to an inducing line, while maintaining feeding performance. SOLUTION: A pick-up coil 5 is formed by turning a cable around both central faces of a core with an H-shaped or an I-shaped cross section. In a linear path of an automatic running car (V) the inducing line 47 is provided on both sides of the pickup coil 5. In a branching path of the automatic running car (V), a looped inducing line 47 is laid at a side part of the pickup coil 5 in the branching direction. In this constitution, when the automatic running car moves at the branching path, the power is fed always by two inducing lines 47 in a smaller way as the linear line, so that a variation in frequency is allowable with the two inducing lines 47 provided in a similar way as the linear line. Then, the problem as in the conventional case in which a variation in frequency of a current fed to the inducing line should be reduced for keeping performance of feeding power can be settled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power supply system.

[0002]

2. Description of the Related Art A conventional non-contact power supply system is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-153305.

That is, an induction line through which a high-frequency current flows is provided along a moving line of a moving body, and a pickup coil which is fed from the dielectric line in a non-contact manner is provided on the moving body. Is connected, a rectifier / smoothing circuit is connected to the capacitor, and a DC voltage stabilizing circuit is connected to the load to supply power to the load in a non-contact manner.

The pickup coil is formed by winding a cable made of, for example, a litz wire around a central convex portion of a core having an E-shaped cross section. The guide line is formed at the center of both concave portions of the core of the pickup coil. It is laid to be located.

[0005]

However, in such a conventional power supply equipment for a moving body, if the pickup coil is oriented in a horizontal direction (a direction in which the convex portion of the E-shaped core is horizontal), the moving body is branched. When guiding to the road, there is a problem that the power supply is stopped until the moving body moves to the installation position of the guideway on the branch road side, and the pickup coil is directed upward or downward (the convex portion of the core is made vertical). Direction), if you try to guide the moving object to a fork,
Since the guide line cannot be pulled out of the pickup coil because it is hindered by the protrusions at both ends of the pickup coil, there is a problem that the guide line cannot be guided to the branch path.

In order to solve the above problem, a pickup coil in which the core has an E-shape or an I-shape has been proposed (for example, see Japanese Patent Application Laid-Open No. 9-298801). FIG. 7 shows a laying diagram of an induction line employing this pickup coil. Two guide lines 51 are laid so as to be located in both concave portions of the core 53 of the pickup coil 52. However, as is evident from FIG. 7, there are places on the branch road where power is supplied by only one guide line 51. As shown in FIG. 2, when the number of the guide lines 51 is one, at an ideal frequency (f ₀ ), the power supply capacity is half that of the case where the number of the guide lines 51 is two, but when the frequency fluctuates. There is a problem that the drop in the power supply capability is large and, therefore, the fluctuation in the frequency of the current supplied to the induction line 51 must be minimized in order to maintain the power supply capability.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a non-contact power supply equipment capable of allowing a change in the frequency of a current supplied to an induction line while maintaining the power supply capability.

[0008]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, an induction line for flowing a high-frequency current along a moving path of a moving body is laid.
A non-contact power supply equipment for providing a pickup coil facing the dielectric line on the moving body and supplying power to a load by an electromotive force induced by the pickup coil, wherein the pickup coil is formed by winding a cable around a core. In the straight part of the movement path, the guide line is laid so as to be located on both sides of the pickup coil,
At the branch of the moving path, a looped guide line is laid so as to be located on the side of the pickup coil in the branch direction.

According to the above configuration, while the moving body is moving on the straight portion of the moving path, the electromotive force is induced in the pickup coil by the magnetic flux generated by the induction lines located on both sides of the pickup coil, and the branching portion is formed. During the movement, an electromotive force is induced in the pickup coil by a magnetic flux generated by two looped induction lines located on the sides of the pickup coil in the branching direction, and power is supplied to the load. Thus, it is possible to solve the problem that the power cannot be supplied when guiding the moving body to the branch road, and the power supply capability at the branch portion is maintained at the power supply capability of the moving path of the straight traveling portion other than the branch portion.

Further, since power is always supplied by the two guide lines in the branch section, the branch section has the same frequency characteristic as that of the straight section, and always has two guide lines like the straight section. In this case, it is possible to tolerate the fluctuation of the frequency at the time, and the problem that the fluctuation of the frequency of the current supplied to the induction line must be suppressed as much as possible in order to maintain the power supply capability as in the related art.

[0011] The invention according to claim 2 provides the above-mentioned claim 1.
The invention described in the above, wherein the cross section of the core is an E-shape or an I-shape.
The cable is wound on both sides of a vertical portion at the center of the core.

According to the above configuration, the pickup coil employs a core having an E-shaped, I-shaped, or T-shaped cross section, and a cable is wound on both surfaces of a vertical portion at the center of the core to thereby induce the induction. The track is located on the side of this cable where the guide line is located. Therefore, since the guide line cannot be pulled out of the pickup coil because it is obstructed by the protrusions at both ends of the pickup coil, the problem that the guide cannot be guided to the branch road is solved, and power is supplied when guiding the moving body to the branch road. The problem of being unable to do so is eliminated.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a plan view of a load transfer facility provided with a non-contact power supply facility according to the embodiment of the present invention.
Is a side view of a self-propelled vehicle of the transport facility, and FIG. 5 is a partial cross-sectional front view of the transport facility.

The load transfer equipment is composed of a plurality of self-propelled vehicles (an example of a moving body) V and a rail device B for forming a moving route (transport route) of the self-propelled vehicle V. Is guided and moved by the rail device B. The self-propelled vehicle V and the rail device B will be described in detail. [Autonomous Vehicle] The self-propelled vehicle V includes a self-propelled vehicle body 1 and a front-rear direction (a traveling direction of the self-propelled vehicle V) which is erected at the center of the self-propelled vehicle body 1
It comprises a carrier 3 supported by two supports 2 and on which a load C to be transported is placed.

At the center of the lower surface of the carrier 3, a pickup coil 5 is provided, in which an electromotive force is induced by a magnetic flux generated by an induction line described later. As shown in FIG. 6, the pick-up coil 5 has five cores 6 made of ferrite having a cross section of an E-shape (which may be an I-shape or a T-shape) in a lateral direction (along the rail device B in FIG. 4). direction)
And is fixed to the base body 8 via a non-magnetic plate 7 with screws 8A. In addition, cores 6 arranged in the horizontal direction
A cable 9 made of, for example, a litz wire of 10 to 20 turns is wound around both surfaces of the central portion 6A. Further, a mounting member 10 is mounted on a side portion of the base body 8. Urethane rubber 10A is inserted between the core 6 at both ends and the folded portion of the plate 7.

The traveling vehicle body 1 is mounted as a traveling means so as to be freely rotatable via an axle, and has four traveling wheels 11, which are fore and aft, left and right, which support the traveling vehicle V, and play through the axle. Power is supplied from a total of eight wheels 12 for lateral movement, which are rotatably mounted, front and rear, left and right, a stator (primary coil) 13 of a linear motor, and the pickup coil 5 to supply a primary current to the primary coil 13 of the linear motor. A linear motor driver 14 is provided.

The self-propelled vehicle body 1 has a seesaw 22 which is disposed at the front and rear and is provided with transfer wheels 21 at left and right ends, respectively, as means for selecting a traveling route.
And a support 23 rotatably supporting the center support shaft of the seesaw 22, and connected to the support shaft of the seesaw 22, further supplied with power from the pickup coil 5, and rotating the support shaft to switch between the left and right. A drive unit 24 including a motor for moving the position of the wheel 21 up and down, and a seesaw 22
A shaft 25 is provided for connecting the central support shaft.

The self-propelled vehicle body 1 has a roller 26 which is rotated by the movement of the self-propelled vehicle body 1 and comes into contact with a first traveling guide surface 41 of a traveling rail 31 which will be described later. And a controller (not shown) for judging the traveling path to travel / stop or move while checking the traveling position by counting pulse signals output from the encoder 27. The controller outputs a traveling command to the driver 14 of the linear motor during traveling, and drives the driving unit 24 when changing the traveling route. The linear motor driver 14 supplies a primary current to the primary coil 13 of the linear motor in accordance with a traveling command from the controller. [Rail device] The rail device B has a shape that covers the self-propelled vehicle body 1 so that the dust generated when the self-propelled vehicle body 1 of the self-propelled vehicle V travels does not diffuse outside. A pair of left and right traveling rails 31 and the left and right traveling rails
Left and right side wall panels 32 fixed to the
(Including the support 2) and a pair of left and right upper panels 33 that can pass through. The pair of left and right traveling rails 31 are connected at their lower ends.

The traveling rail 31 has a first traveling guide surface 41 that contacts the traveling wheels 11 from below, and a second traveling guide surface 42 that contacts the lateral movement regulating wheels 12 from outside. , And inside the traveling rail 31, the primary coil 18 of the linear motor
In the traveling direction of the vehicle V, N-pole magnets and S-pole magnets 44 are repeatedly arranged.

A pair of guide rails 45 having running guide surfaces respectively contacting the left and right transfer wheels 21 are provided on the inner side surfaces of the left and right side wall panels 32, respectively. A guide line 47 is laid at the opposite end supported by a hanger 46 protruding from the end. FIG. 1 shows an installation diagram of the guide line 47 at a branch portion of the rail device B.

As shown in FIG. 1, in the straight traveling portion of the moving path (rail device B), the guide line 47 is positioned at the center of both the concave portions on the side of the E-shaped core 6 of the pickup coil 5. In the branch portion, a looped guide line 47 is laid at a position where one of the guide lines 47 is separated from the pickup coil 5 so as to be located in a concave portion of the pickup coil 5 in the branch direction. In FIG. 1, arrows indicate the direction in which current flows.

The operation of the above configuration will be described. First, when power is supplied to the guide line 47, an electromotive force is generated in the pickup coil 5 by the magnetic flux generated by the left and right guide lines 47 located in the two concave portions (side portions) of the pickup coil 5 in the straight traveling portion of the movement path. Then, an electromotive force is induced in the pickup coil 5 of the self-propelled vehicle V. The alternating current generated by the electromotive force is rectified and regulated to a predetermined voltage, and the controller, the linear motor driver 14, It is supplied to the drive unit 24. Then, when a traveling command is output from the controller to the linear motor driver 14, the linear motor driver 14 supplies a primary current to the primary coil 13 of the linear motor in accordance with the traveling command of the controller. V moves while being guided by the running rail 43.

When changing the moving route, the controller instructs the drive unit 24 to move the see-saw so that the transfer wheel 21 contacts the guide rail 45 on the selected moving route.
Drive 22. When the vehicle reaches the branch, the transfer wheel 21 is guided by the guide rail 45 on the side of the selected moving route, thereby changing the moving route. In the branching section, an electromotive force is generated in the pickup coil 5 of the self-propelled vehicle V by the magnetic flux generated by the two induction lines 47 looped so as to be located in the concave portion (side portion) of the pickup coil 5 in the branching direction. Then, the pickup coil 5 similarly supplies power to the controller, the driver 14 of the linear motor, and the drive unit 24.

As shown in FIG. 2, when the number of the guide lines 47 is one, at an ideal frequency (f ₀ ), the power supply capability is half that of the case where the number of the guide lines 47 is two. When it fluctuates, the drop in power supply capacity is large, and
It is necessary to suppress it more than in a book. As described above, the power is always supplied by the two guide lines 47 in the branch portion, so that the power supply device has the same frequency characteristic as that of the straight traveling portion, and always allows the frequency variation when the two guide lines 47 are provided. As a result, it is possible to solve the problem that the fluctuation of the frequency of the current supplied to the induction line must be minimized in order to maintain the power supply capability as in the related art.

As described above, while the self-propelled vehicle V is moving along the branch of the moving path, the pickup flux is generated by two looped guide lines 47 located in the concave portion of the pickup coil 5 in the branch direction. When the electromotive force is induced in the coil 5, it has the same frequency characteristics as the straight section at the branch section, can allow a change in frequency, and reduces the power supply capacity at the branch section to the power supply capacity of the straight section. Can be maintained. In addition, by adopting the E-shaped core 6 in the pickup coil 5, the vehicle V can be branched, and the problem that power cannot be supplied when the vehicle V is guided to the branch road can be solved. .

In this embodiment, two guide lines are used.
47 are arranged side by side in the horizontal direction. By arranging more induction lines, the electromotive force induced in the pickup coil 5 can be reduced while suppressing the current flowing through one induction line 47 to an allowable current value or less. Can be increased.

[0027]

As described above, according to the present invention, while the moving body is moving on the branching section, power is always supplied by two guide lines as in the case of the straight section, so that the mobile body is always guided in the same manner as in the straight section. Eliminates the problem that frequency fluctuations when there are two lines can be tolerated and frequency fluctuations of the current supplied to the induction line must be minimized in order to maintain the power supply capability as in the past. can do.

[Brief description of the drawings]

FIG. 1 is a laying diagram of a guide line of a wireless power supply system according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram of a power supply capacity of an induction line of the contactless power supply equipment.

FIG. 3 is a plan view of a load transport facility provided with the contactless power supply facility.

FIG. 4 is a side view of a self-propelled vehicle of a load transfer facility provided with the non-contact power supply facility.

FIG. 5 is a partial cross-sectional front view of a load transfer facility provided with the contactless power supply facility.

FIG. 6 is a plan view and a front view of a pickup coil of the contactless power supply equipment.

FIG. 7 is a laying diagram of a guide line of a conventional contactless power supply facility.

[Explanation of symbols]

 V Self-propelled car B Rail device C Load 1 Self-propelled car body 3 Carrier 5 Pick-up coil 6 Core 11 Running wheel 12 Lateral movement control wheel 13 Linear motor (primary) 14 Linear motor driver 21 Transfer wheel 22 Seesaw 24 Drive 31 Running rail 44 Magnet 45 Guide rail 47 Guidance line

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Inaba 1500 Komakihara Nitta, Komaki City, Aichi Pref. Inside Daifuku Komaki Plant (72) Inventor Kiyohide Ichino 1500 Komakihara Nitta, Komaki City, Aichi Pref. 3F021 AA01 BA02 CA06 DA02 3F027 AA10 CA01 DA19 FA02 5H105 AA20 BA02 BA07 BB07 CC02 CC19 DD10

Claims (2)

[Claims] An induction line for flowing a high-frequency current is laid along a moving path of a moving body, a pickup coil is provided on the moving body so as to face the dielectric line, and a load is generated by an electromotive force induced by the pickup coil. Non-contact power supply equipment for feeding power to the pickup coil, wherein the pickup coil is formed by winding a cable around a core, and in a straight portion of the moving path, the induction line is located at both sides of the pickup coil. A non-contact power supply facility, wherein a looped guide line is laid so as to be located at a side of a pickup coil in a branching direction at a branch portion of a moving path. 2. The core according to claim 1, wherein a cross section of the core is E-shaped, I-shaped, or T-shaped, and the cable is wound on both sides of a central vertical portion of the core. Item 1. A non-contact power supply equipment according to Item 1.