JPH05207603A - Noncontact power supply for moving object - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a contactless power supply facility capable of supplying power to a moving body in a contactless and stable manner. [Structure] A pair of guide lines 21 connected to a high-frequency sinusoidal resonance inverter are laid along the guide path 4, and the guide line 21 is attached to a traveling body 22 that is guided and moved by the guide path 4.
A coil 27 that resonates at the frequency is vertically installed so as to face the center of each induction line 21. [Effect] Power can be supplied to the traveling body 22 while the vehicle is traveling without contact, and work efficiency can be improved. Since the self-inductance of the dielectric line 21 is almost constant, the primary side current is almost constant, and a high frequency sine wave current is passed through the induction line 21 to form a resonant circuit on the secondary side. Even if the gap length between the induction line 21 and the coil 27 changes, a secondary voltage of a predetermined value or more is generated, so that a large amount of power can be stably supplied. In addition, the gap length can be roughly adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact power feeding facility for a mobile body, and more particularly to a non-contact power feeding facility for a self-propelled carrier that is guided by a guide path laid on the floor to carry a load. ..

[0002]

2. Description of the Related Art The conventional self-propelled carrier and its power feeding device will be described with reference to FIGS. Reference numeral 1 denotes a traveling body (self-propelled carriage) that automatically travels on a floor 3 by traveling wheels 2 at four corners of a lower surface. The automatic traveling of the traveling body 1 is guided by a guide path 4 laid on the floor 3. .. A load receiving portion 5 for loading a load is provided on the upper surface of the traveling body 1, and a battery 6 and a traveling drive device (not shown) that uses the battery as a driving power source are provided inside, and traveling is performed by the traveling drive device. The wheels 2 are driven and travel.

Further, as a contactless power supply device, a secondary core 8 that forms a magnetic path is vertically provided in the lower portion of the traveling body 1 so as to face the primary core 7 installed in the battery charging station. When an alternating current is applied to the coil 9 wound around the provided primary core 7, an electromotive force is generated in the coil 10 wound around the secondary core 8, and the alternating current generated by this electromotive force causes the traveling body to travel. 1 is supplied to the battery 6 via the AC / DC converter 11 inside, and the battery 6 is charged.

[0004]

However, in such a structure, the traveling body 1 is not charged unless the traveling body 1 leaves the transportation route and travels to the charging station, so that the working efficiency is poor and the primary core 7 is transported. Laying along the route solves this problem, but it is difficult to manufacture and costly. Further, the self-inductance on the primary side changes greatly due to the change in the gap length g between the primary core 7 and the secondary core 8, so that the primary side current value changes greatly and the secondary side voltage value changes greatly. As a result, overcurrent and overvoltage may occur, and the protection device may operate and power may not be supplied.

The present invention solves the above problems,
It is an object of the present invention to provide a non-contact power feeding facility for a mobile body, which can feed power stably without contact and can improve work efficiency.

[0006]

In order to solve the above-mentioned problems, the contactless power feeding equipment for a moving body of the present invention lays a line for flowing a high frequency sine wave current along a guide path for guiding the moving body, The moving body is provided with a pickup coil that resonates at the frequency of the line and generates an electromotive force.

[0007]

With the structure of the above invention, the electromotive force is generated in the pickup coil, so that the moving body is supplied with power without contact even during traveling, and is guided to the guide path to travel. In addition, since the line length is much longer than the pickup coil length, the primary side self-inductance of the line becomes almost constant, so the primary side current becomes almost constant, and the secondary side of the pickup coil becomes a resonance circuit. As a result, a large electromotive force is generated on the secondary side, so that even if the gap length between the line and the pickup coil changes, the secondary side voltage becomes a predetermined value or more, and a large amount of power is stably supplied. Furthermore, since the current flowing through the line is a sine wave, harmonics do not occur and radio noise is prevented from occurring. Further, since the core is not required on the primary side, it is possible to easily lay the line at low cost.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same components as those in FIGS. 6 and 7 of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is a partial cross-sectional perspective view of a contactless power supply equipment for a mobile body of the present invention, and FIG. 2 is a configuration diagram of a power supply device for a mobile body of the contactless power supply equipment for a mobile body of the present invention. 21 is a traveling body 22
The groove 23 is provided along the guide path 4 within the width of
As shown in FIG. 3, the guide line 21 is a pair of guide lines laid in the groove 23 and having different energization directions. The start end is connected to the power supply device 24 and the end is connected to form a loop. Has been done. The guide line 21 is formed by covering a stranded wire (hereinafter, referred to as a litz wire) formed by collecting insulated thin wires with an insulator, for example, a resin material.

In addition, as a power feeding device for the traveling body 22, FIG.
As shown in, a ferrite 25 having a semicircular cross section is laid down and arranged parallel to the lengthwise direction on the plane, and the litz wire 26 of 10 to 20 turns is wound around these two ferrites 25, for example. The pickup coil 27 is vertically installed so that the center of each ferrite 25 in the lengthwise direction is located above each induction line 21, and as shown in FIG.
An AC-DC converter 28 is provided for converting an electromotive force generated in the pickup coil 27 into a predetermined DC voltage when the induction line 21 is energized (AC), and equipped with a speed reducer for driving the traveling wheels 2 as a traveling drive device. Electric motor 29 and this motor
A motor controller 30 that drives 29 is provided.

A detailed circuit configuration of the power supply device 24 and the power supply device for the traveling body 22 will be described with reference to the circuit diagram of FIG. The power supply device 24 includes an AC 200 V three-phase AC power supply 41 and a converter 42.
A sine wave resonance inverter 43, an overcurrent protection transistor 44 and a diode 45. The converter 42 includes a diode 46 for full-wave rectification, a coil 47, a capacitor 48, a resistor 48, and a transistor 50 that short-circuits the resistor 49, which constitutes a filter. The sine wave resonant inverter 43 is configured as shown in the figure. Transistors 51 and 52 driven by rectangular wave signals oscillated alternately, current limiting coil 53, current supply coil 54 connected to transistors 51 and 52, induction line 21 and parallel resonant circuit And a capacitor 55 that forms The transistor control device is omitted.

Further, the traveling body 22 is provided in parallel with the pickup coil 27, and is provided with a capacitor 56 which constitutes a resonance circuit resonating at the frequencies of the pickup coil 27 and the induction line 21,
A rectifying diode 57 is connected in parallel to the capacitor 56 of the resonance circuit, a stabilizing power supply circuit 58 for controlling the output to a predetermined voltage is connected to the diode 57, and a load, for example, a motor controller 30 is connected to the stabilizing power supply circuit 58. Through the motor 29
Are connected and configured. The AC / DC converter 28 is composed of a rectifying diode 57 and a stabilized power supply circuit 58. The stabilized power supply circuit 58 includes a current limiting coil 59, an output adjusting transistor 60, a diode 61 and a capacitor 62 that form a filter. In addition,
The transistor control device is omitted.

The operation of the circuit configuration of the power supply device 24, the guide line 21 and the traveling body 22 will be described. First, AC200V three-phase AC output from the AC power supply 41 is converted into DC by the converter 42, converted into a high frequency, for example, 10 kHz sine wave by the sine wave resonance inverter 43, and supplied to the guide line 21. Due to the magnetic flux generated in the induction line 21, a large electromotive force is generated in the pickup coil 27 of the traveling body 22 that resonates at the frequency of the induction line 21, and the alternating current generated by this electromotive force is rectified by the diode 57 and stabilized. The voltage is regulated to a predetermined voltage by the power supply circuit 58 and the motor controller
It is supplied to the motor 29 via 30, and the traveling body 22 of the moving body
The traveling wheel 2 is driven by the motor 29 that is supplied with power,
It is guided by the guide path 4 and moves.

As described above, since the electric power can be supplied to the traveling body 22 in a contactless manner while traveling, the working efficiency can be improved. Furthermore, the length of the guide line 21 is equal to that of the pickup coil 27.
Is much longer than the length of
The length of the pickup coil 27 is 10 to 100 m.
Since it is 15 cm, the primary side self-inductance of the inductive line 21 is almost constant, and the capacitor 55 of the power supply 24 is
Since the induction line 21 and the induction line 21 form a resonance circuit, the sine wave primary side current can flow at a high frequency with a substantially constant large current value in the induction line 21.
By 27 the secondary side of the resonant circuit, as shown in FIG. 5, the resonance frequency f _o with a large voltage on the secondary side v (in the drawing
(1000 to 2000 V) occurs and the gap length between the induction line 21 and the pickup coil 27 changes, or even if the frequency of the induction line 21 fluctuates somewhat, the resonance frequency on the secondary side is still the frequency of the induction line 21. Frequency f _{1 to} f ₂
In this range, a secondary voltage higher than a predetermined value (300 V in the figure) can be generated, and a large amount of power can be stably supplied. Therefore, the gap length can be roughly adjusted, workability is improved, and manufacturing can be facilitated. Further, since the core is not required on the primary side, the line can be easily laid at low cost.

Further, the induction line 21 and the pickup coil 27
By using a litz wire covered with an insulator for the part, the conductive part is not exposed and safety can be improved.Because the spark does not disappear, there is no danger of fire, etc., and it is also used in explosion-proof areas. It becomes possible to do. Furthermore, since a sinusoidal wave is fed to the guide line 21, no harmonic is generated and radio noise can be eliminated.

In this embodiment, the two guide lines 21 are laid on the floor surface 3. However, when the two guide lines 21 cannot be laid on the floor surface 3, only one of the guide lines 21 is laid. The pickup coil 27 may be laid along the floor surface 3, and the other guide line 21 may be routed through another path so that the pickup coil 27 moves only close to one guide line 21. Needless to say, the power is turned off at this time. Further, it is also possible to lay two or more guide lines 21 in the groove 23 to increase power.

[0017]

As described above, according to the present invention, since electromotive force is generated in the pickup coil, the moving body can be contactlessly supplied with power even while traveling and guided by the guide path to travel. It is possible to improve work efficiency.
Also, since the line length is significantly longer than the pickup coil length, the primary side self-inductance of the line becomes almost constant, the primary side current can be made almost constant, and the secondary side becomes a resonance circuit, Since a large voltage can be generated on the secondary side, even if the gap length between the line and the pickup coil changes, the secondary voltage can be maintained at a predetermined value or more, and a large amount of power can be stably supplied. Furthermore, the gap length can be roughly adjusted, which improves workability and facilitates manufacturing. Further, since the current flowing through the line is a sine wave, harmonics are not generated and radio noise can be eliminated. Furthermore, since the core is not required on the primary side, the line can be easily laid at low cost.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view of a contactless power supply facility for a mobile body according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a power feeding device for a mobile unit of the contactless power feeding facility for the mobile unit.

FIG. 3 is a schematic perspective view of a pickup coil of the contactless power feeding equipment of the mobile body.

FIG. 4 is a circuit configuration diagram of a contactless power feeding facility of the mobile body.

FIG. 5 is a secondary-side frequency-electromotive force characteristic diagram of the contactless power supply equipment for the mobile unit.

FIG. 6 is a partial cross-sectional perspective view of a conventional moving body.

FIG. 7 is a configuration diagram of a conventional non-contact power feeding facility for a mobile body.

[Explanation of symbols]

3 Floor surface 4 Guide path 21 Induction line 22 Moving body (moving body) 24 Power supply device 27 Pickup coil 43 Sine wave resonance inverter 55 Capacitor forming resonance circuit with induction line 56 Capacitor forming resonance circuit with pickup coil

Claims (1)

[Claims] 1. A guide path for guiding a moving body,
A contactless power feeding facility for a mobile body, wherein a line for flowing a high-frequency sine wave current is laid, and a pickup coil that resonates at the frequency of the line and generates an electromotive force is provided in the mobile body.