JPH09252552A - Contactless power supply apparatus for moving body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a contactless power supply apparatus which shortens the operating time of a switch means and which reduces a power loss in the switch means, by a method wherein usually a current obtained by a partial resonance is supplied to a load and, when the load approaches an upper-limit value, a current obtained by a resonance is supplied to the load. SOLUTION: A car body V as a moving body is moved by a motor 4 which is electrified. In addition, when a load is placed on a carrier for object transportation or a running operation is started, a load applied to the motor 4 is increased. When a current value supplied to the motor 4 approaches 100%, a current detector 63 is operated. Switch means 57A, 57B are operated by the operating output of the current detector 63, second capacitors 58A, 58B are inserted, a resonant circuit which is resonated with the frequency of an induction line 14 is formed, the impedance is reduced, and a large current is supplied to the load so as to deal with the load. As a result, the operating time of the switch means 57A, 57B can be shortened, and a power loss can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contactless power feeding facility for a mobile body.

[0002]

2. Description of the Related Art A conventional non-contact power feeding facility for a moving body is disclosed in, for example, Japanese Patent Laid-Open No. 6-153305.

That is, an induction line for flowing a high-frequency current is stretched along a moving line of a moving body, a coil which is fed from the dielectric line in a contactless manner is provided on the moving body, and a resonance circuit is formed in this coil. A capacitor is installed to supply power to the load. Further, a switch that short-circuits both ends of the coil is provided, and when the load is lightened and the voltage across both ends rises, the switch is operated to short-circuit the coil to cause non-resonance.

[0004]

However, in such a conventional non-contact power feeding equipment for a mobile body, there has been a problem that the power loss in the switch part cannot be ignored if the load is kept light.

Therefore, an object of the present invention is to provide a non-contact power feeding facility for a moving body which is non-contact and has little power loss.

[0006]

In order to achieve the above-mentioned object, the contactless power feeding equipment for a moving body according to the first aspect of the present invention has an induction line extending a high-frequency current along the moving line of the moving body. A non-contact power feeding facility for a moving body, wherein the moving body is provided with a coil to which electric power is fed from the dielectric line in a non-contact manner, wherein the moving body partially resonates with the coil at a frequency of the induction line. A first capacitor that forms a circuit and a second capacitor that forms a resonance circuit that resonates at the frequency of the induction line together with the coil and the first capacitor via a switch are provided, and the switch has a load connected to the coil. It is characterized in that it is configured to be input when the temperature rises close to 100%.

With the above structure, during normal operation, the electromotive force generated in the coil is boosted by the partial resonance circuit consisting of the coil and the first capacitor and supplied to the load, and when the load rises close to 100%, The second capacitor is connected to form a resonance circuit, the impedance is reduced, and a large current is supplied to the load.

Further, in the contactless power supply equipment for a mobile object according to the second aspect of the present invention, an induction line for passing a high frequency current is stretched along the mobile track of the mobile object, and power is supplied to the mobile object without contact from the dielectric line. A non-contact power feeding facility for a moving body provided with a coil, characterized in that a magnetic field cutting member is attached to a back surface side of the coil which does not face the induction line.

With the above structure, useless magnetic flux induced on the back side of the coil is cut, the inductance accompanying this is reduced, the value of the current supplied from the coil can be increased, and the performance is improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a side view of the contactless power supply equipment for a mobile body according to the embodiment of the present invention, and FIG. 3 is a partial sectional front view of the mobile body of the contactless power supply equipment.

A transport vehicle body V as a moving body includes a drive trolley 1A, a driven trolley 1B, and these trolleys 1A and 1B.
And a guide rail B for movably guiding the vehicle body V.

The drive trolley 1A includes traveling wheels 2 that engage with the upper portions of the guide rails B, steady rest rollers 3 that contact the lower portions of the guide rails B from both sides, and a pickup unit P. Is driven by the electric motor 4 with a speed reducer. Further, the driven trolley 1B includes traveling wheels 5 that engage with the upper portions of the guide rails B, and steady rest rollers 6 that contact the lower portions of the guide rails B from both lateral sides.

The guide rail B is provided with a wheel guide portion 7 at its upper portion and a roller guide portion 8 at its lower portion, and is supported in a suspended state from the ceiling or the like by a support frame 9 connected to one lateral side. The guide line unit X is attached to the other side of the guide rail B to which the support frame 9 is attached.

In the guide line unit X, a bracket 12 is attached to one side portion of the guide rail B along the guide rail B, and hangers 11 vertically project from the guide rail B at predetermined intervals.
As shown in an enlarged manner in FIG. 4, a bag-shaped recess 11A is provided at the tip of the hanger 11, and a loop-shaped guide line 14 having a starting end connected to the power supply device M is fitted in the recess 11A in the longitudinal direction. The claw portion 13A of the cover 13 is inserted and the guide line 14 is laid along the guide rail B. The bracket 12 has screw holes provided at the upper and lower ends thereof by fitting the upper and lower ends thereof to the claw portions 7A and 8A which are respectively provided inwardly from the wheel guide portion 7 and the roller guide portion 8 of the guide rail B. It is fixed by fitting a set screw 12B to 12A and making its tip bite into the guide rail B.
With this configuration, the hanger 11 is horizontally provided on one lateral side of the guide rail B. The induction line 14 is formed by covering a twisted wire (hereinafter, referred to as a Litz wire) formed by collecting insulated thin wires with an insulator, for example, a resin material, and the start end and the end are connected to the power supply device M. And is laid in a loop.

The pickup unit P is shown in FIG.
As shown in FIG. 5, the ferrite 21 has a U-shaped cross section and has convex portions 21A at its tip facing the opening, and leg portions 21C provided at both outer ends of the side portion 21B. 8
Side by side in a horizontal direction (direction along the guide rail B in FIG. 2) via a spacer 22 having a U-shaped cross section.
For example, the Litz wire of several tens turns is wound to form a pickup coil 23 over D, and a plate-shaped back plate 24 formed of a magnetic field blocking member (aluminum or copper material) is attached to the leg 21C. Has been done. Further, the back plate 24 has an end block 25 for holding the side surfaces of the pickup coil 23 protruding from the ferrite 21, respectively.
Are provided, and mounting holes 26 are provided on all four sides.

In this pickup unit P, as shown in FIG. 4, the pickup coil 23 extends along the guide line 14,
Further, the opening of the U-shaped ferrite 21 is adjusted so as to face one lateral side portion of the guide rail B, and the guide line 14 is positioned at the center Q thereof, and is fixed to the side surface of the vehicle body V on the guide rail B side. . By this attachment, the hanger 11 is located at the center of the opening of the U-shaped ferrite 21. When the induction line 14 is energized (alternating current), an electromotive force is generated in the pickup coil 23. Further, the plate-shaped back plate 24 formed of the magnetic field blocking member blocks unnecessary magnetic flux induced outward from the side portion 21D of the ferrite 21, reduces the inductance, and efficiently generates electromotive force.

The circuit configuration of the power supply device M and the vehicle body (moving body) V will be described with reference to the circuit diagram of FIG. The power supply M is
AC 200 V three-phase AC power supply 41, converter 42, sine wave resonant inverter 43, and transistor 44 for overcurrent protection
And a diode 45. The converter 42 is a diode 46 for full-wave rectification and a coil forming a filter.
The sine wave resonant inverter 43 comprises a capacitor 47, a capacitor 48, a resistor 49, and a transistor 50 for short-circuiting the resistor 49.
Includes transistors 51 and 52 driven by rectangular wave signals alternately oscillated as shown in the figure, a current limiting coil 53, a current supplying coil 54 connected to the transistors 51 and 52, It comprises an induction line 14 and a capacitor 55 forming a parallel resonance circuit. Note that the transistor control device is omitted. Further, the vehicle body V is arranged in parallel with the pickup coil 23, and is connected to the pickup coil 23 and the guide line.
First to form a partial resonance circuit that partially resonates at 14 frequencies
A capacitor 56 is provided, and in parallel with the first capacitor 56,
Via the switching means 57A, 57B, the pickup coil 23, the first capacitor 56 and the second capacitors 58A, 58B forming a resonance circuit resonating at the frequency of the induction line 14.
Is connected in parallel to the capacitor 56, a diode 59 for full-wave rectification is connected, a stabilized power supply circuit 60 for controlling the output to a predetermined voltage is connected to the diode 59, and a load is applied to the stabilized power supply circuit 60. For example, the motor 4 is connected via an inverter 61, and the current detector 63 is connected via a shunt 62. The stabilized power supply circuit 60 includes a current limiting coil 64, an output adjusting transistor 65, a diode 66 and a capacitor 67 that form a filter. Note that the transistor control device is omitted.

The operation of the circuit configuration of the power supply device M, the guide line 14 and the vehicle body V will be described. Normally, the switching means 57A and 57B are turned off. First, AC power supply
AC200 V 3 phase AC output from 41 is converted by converter 42
Is converted to direct current by the sine wave resonance inverter 43 and converted to a high frequency, for example, 10 kHz sine wave by the induction line.
Supplied to 14.

Due to the magnetic flux generated in the guide line 14, a large electromotive force is generated in the pickup coil 23 of the vehicle body V located on the guide rail B that partially resonates at the frequency of the guide line 14, and the alternating current generated by this electromotive force is generated. Current is a diode
It is rectified by 59, regulated to a predetermined voltage by the stabilized power supply circuit 60, and supplied to the electric motor 4 with a speed reducer via the inverter 61.
Thus, the traveling wheels 2 are driven and guided by the guide rail B to move. In addition, when a load is loaded on the article transport carrier 1C or the load on the motor 4 increases at the start of traveling, and the current value supplied to the motor 4 approaches 100%, the current detector 63 operates, The switching means 57A, 57B are operated by the operation output of the current detector 63, the second capacitors 58A, 58B are inserted, and the induction line 14
A resonance circuit that resonates at the frequency is formed, the impedance is reduced, and a large current is supplied to the load, so that the load can be handled.

As described above, normally, when the current obtained by partial resonance is supplied to the load and the load approaches 100%,
By supplying the load with the current obtained by resonance,
The time during which the switching means 57A and 57B are operating can be shortened, so that the power loss in the switching means 57A and 57B can be reduced.

Since the opening of the U-shaped ferrite 21 opposes one lateral side of the guide rail B and the guide line 14 is positioned and fixed at the center Q of the guide rail B, the pickup coil 23 is fixed. Is located at the position where the magnetic flux density generated in the induction line 14 is the largest, the largest electromotive force is induced, and power can be efficiently supplied. Further, the ferrite 21 and the pickup coil 23 do not contact the guide line 14 even at the curved portion of the guide rail B, and the vehicle body V can smoothly bend at the curved portion. In addition, ferrite 21 with a U-shaped cross section
Then, by winding the litz wire over the side surface to form the pickup coil 14, both side portions 21 of the ferrite 21 are
Since the litz wire is held by B and the leg portion 21C, the litz wire can be easily wound and the work efficiency can be improved. Further, since a magnetic path is formed in the convex portion 21A at the tip of the ferrite 35, a higher electromotive force can be generated. In addition, by forming the pickup unit P with a plurality of ferrites 21 spaced apart from each other, it is possible to reduce the weight while maintaining its performance by the end effect, and it is possible to reduce the cost.

Further, the induction line 14 and the pickup coil 23
Use a litz wire covered with an insulator for the
By covering with 13, the conductive part is not exposed and safety can be improved, and since the spark disappears, there is no danger of fire or the like, and it can be used in an explosion-proof area. Further, since a sine wave is supplied to the induction line 14, no harmonic is generated, and the generation of radio noise can be eliminated.

In this embodiment, one induction line is used.
Although 14 is laid on the guide rail B, two or more guide lines 14 can be laid on the guide rail B to increase power. Further, the two guide lines 14 may be laid on the guide rail B to perform non-contact power feeding. At this time, two hangers 31 are required.

Further, although the vehicle body V which moves along the guide rail B is described in the present embodiment, the present invention is also applicable to a vehicle which travels along a fixed route on the ground, and the same. You can expect an effect. An example of the pickup coil P'at this time is shown in FIG.

Four ferrite blocks 31 are arranged in the shape of a square, and ferrite blocks 32 are arranged so as to straddle each two of the four ferrite blocks 31, and these ferrite blocks 31, 32 are arranged. In order to support the above, the two base bodies 33 arranged on the four ferrite blocks 31 and the two holding plates 34 arranged on the two ferrite blocks 32 are fixed by screws. Then, a litz wire is wound around the upper surface and the lower surface of the two ferrite blocks 32 to form a pickup coil 35. Further, a back plate 36 made of a magnetic field blocking body (aluminum or copper material) that blocks a magnetic field is fixed on the two base bodies 33 and the two holding plates 34, and these two base bodies 33 and two Ferrite blocks 31, 32 fixed by pressing plate 34
Further, a mounting member 38 is provided to fix the pickup coil 35 and the back plate 36 to the outer case 37.

As shown in FIG. 7, the pickup coil P'formed in this way is attached to the vehicle so as to face the guide line 14 'laid along a fixed path and generate an electromotive force. Further, since the pickup coil P'is also composed of a plurality of ferrite blocks, it is possible to realize weight reduction while maintaining its performance by the end effect, and it is possible to reduce the cost.

[0027]

As described above, according to the first aspect of the present invention, during normal operation, the electromotive force generated in the coil is boosted by the partial resonance circuit including the coil and the first capacitor.
When the load is supplied and the load rises close to 100%, the second capacitor is connected to form a resonant circuit,
By reducing the impedance and supplying a large current to the load, it is possible to sufficiently cope with the load, and it is possible to shorten the time during which the switch is operating, thereby reducing the power loss in this switch.

Further, according to the second aspect of the present invention, useless magnetic flux induced on the back side of the coil is cut, the inductance accompanying this is reduced, and the value of the current supplied from the coil can be increased to improve performance. Can be improved.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a non-contact power feeding facility for a moving body according to an embodiment of the present invention.

FIG. 2 is a side view of the contactless power supply equipment for the mobile unit.

FIG. 3 is a partial cross-sectional front view of the contactless power supply equipment for the mobile unit.

FIG. 4 is a side view and a plan view of a bracket of the contactless power feeding facility of the mobile body.

FIG. 5 is a plan view, a front view, and a side view of a pickup coil of the contactless power feeding facility of the mobile body.

FIG. 6 is a plan view, a front view, and a side view of a pickup coil of a contactless power feeding facility for a moving body according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view of a pickup coil of the contactless power feeding facility of the mobile body.

[Explanation of symbols]

V Carrying body B Guide rail X Induction line unit P Pickup unit M Power supply device 11 Hanger 12 Bracket 14 Induction line 21 Ferrite 22 Spacer 23,35 Pickup coil 24,36 Back plate (magnetic field blocking material) 25 End block 31,32 Ferrite Block 33 Base body 34 Holding plate 37 Case 38 Mounting member 43 Sine wave resonance inverter 56 First capacitor 57A, 57B forming pickup coil and partial resonance circuit Switching means 58A, 58B Forming resonance circuit with pickup coil and first capacitor Second capacitor

Claims (2)

[Claims] 1. A non-contact power supply facility for a mobile body, in which an induction line for flowing a high-frequency current is stretched along the mobile line of the mobile body, and a coil is provided to the mobile body in a non-contact manner from the dielectric line. In the moving body, a first capacitor that constitutes a partial resonance circuit that partially resonates with the coil at the frequency of the induction line, and a resonance with the coil and the first capacitor via a switch at the frequency of the induction line. A non-contact power feeding of a moving body, wherein a second capacitor constituting a resonance circuit is provided, and the switch is turned on when a load connected to the coil rises to nearly 100%. Facility. 2. A non-contact power feeding facility for a mobile body, in which an induction line for flowing a high-frequency current is stretched along the mobile line of the mobile body, and a coil to which electric power is fed from the dielectric line in a non-contact manner is provided on the mobile body. A contactless power feeding facility for a mobile body, wherein a magnetic field blocking member is attached to a back surface side of the coil that does not face the induction line.