JP3391149B2 - Contactless power supply equipment for mobile objects - Google Patents

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 truck that travels along a traveling path to transport a load.

[0002]

2. Description of the Related Art As a conventional non-contact power feeding facility for a moving body, for example, as disclosed in Japanese Patent Laid-Open No. 6-153305, a guide rail (running path) for a vehicle body (moving body).
An induction line for flowing a resonance current is stretched along with, a resonance circuit having the same frequency as the resonance current frequency of the dielectric line is formed in the moving body, and a pickup unit (coil) fed from the dielectric line is provided. There is known a facility for supplying electric power to a moving body in a contactless manner.

[0003]

However, in the conventional power feeding equipment for a moving body, the resonance frequency of the induction line is
The output frequency of the power supply device (inverter) that supplies the resonance current must be adjusted because it changes depending on the length of the installed induction line, and the elements that make up this power supply device and the induction line and the resonance circuit are formed. It is necessary to review the ratings of the capacitors that form the resonance circuit and the capacitors that form the pickup coil of the moving body, and it is necessary to design each time.

The present invention solves the above problems,
An object of the present invention is to provide a contactless power supply equipment for a mobile body, which can always supply a current having a predetermined resonance frequency regardless of the length of the induction line, and which does not require a change in the power source and the circuit of the mobile body.

[0005]

In order to solve the above problems, the contactless power feeding equipment for a mobile object of the first aspect of the present invention resonates with a capacitor to generate a high frequency sine wave current along a travel path along which the mobile object travels. A pair of flowing lines is laid, and a coil with variable inductance is connected in series or in parallel to the line to form a resonance circuit with this coil and the line.
A capacitor provided, wherein the mobile resonates to the frequency of the line, providing a pick-up coil electromotive force occurs, the
A sinusoidal resonant inverter that supplies the sinusoidal current to a line
To form this sinusoidal resonant inverter,
The voltage across the capacitor forming the oscillation circuit becomes 0V.
Sometimes these transistors switch alternately and these
Between the coil for current supply connected to the transistor,
Connect the diodes respectively and use these diodes to
Transit due to delay in transistor switching operation
High-frequency pulse current is generated, and the transistor is overcharged.
Current, overvoltage occurs and the transistor cannot be used
It is characterized by preventing this .

The contactless power supply equipment for a mobile object of the second invention is the contactless power supply equipment for a mobile object according to the first invention,
A plurality of capacitors are arranged in parallel between the pair of lines at a predetermined interval.
Connected to both ends of adjacent capacitors to zero
It is characterized by connecting with an impedance cable .

[0007]

According to the structure of the first aspect of the invention , when the induction line is energized (alternating current), electromotive force is generated in the coil, so that the moving body is contactlessly supplied with power even while the vehicle is running, and the moving path is fed. Drive along. In addition, the resonance frequency that changes depending on the length of the line is adjusted to a predetermined resonance frequency by adjusting the inductance of the coil, and power is stably and efficiently supplied to the moving body. In addition, the transistor that constitutes the sine wave resonance inverter
Due to the delay in the switching operation of the
Loose current occurs, causing overcurrent and overvoltage in the transistor.
If the transistor becomes unusable,
Current supply connected to the transistor and these transistors
By connecting diodes between the coils for
Be prevented.

According to the structure of the second invention , the line
If the laying distance becomes long, the inductance of the line
The flowing current and voltage are reduced, and the pickup coil of the moving body
The problem of not being able to generate sufficient electromotive force
Connect multiple capacitors in parallel at a specified interval between a pair of lines
The zero impedance across the adjacent capacitors.
It is solved by connecting with a dance cable.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a non-contact power feeding equipment for a mobile body of the present invention, and FIG. 2 is a partial cross-sectional front view of a mobile body of the non-contact power feeding equipment for a mobile body of the present invention.

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 is provided with a traveling wheel 2 that engages with an upper portion of the guide rail B, a steadying roller 3 that comes into contact with the lower portion of the guide rail B from both lateral sides, and a pickup unit P described later. The wheels 2 are driven by an 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 a ceiling or the like by a support frame 9 connected to one lateral side portion. A guide line unit X, which will be described later, is provided on the other side of the guide rail B to which the support frame 9 is attached.
Is attached.

Further, a power supply device M, which will be described later, is connected to the starting end of the guide line unit X via an adjusting unit J, which will be described later. As shown in an enlarged view in FIG. 3, the guide line unit X is integrated with the hanger 11 at one lateral side of the guide rail B, at predetermined intervals along the guide rail B, at the tips of a pair of upper and lower hangers 11. A bracket 12 having a ring-shaped engaging portion 11A that is open and has a flexible shape and maintains a predetermined shape is attached.
The guide line 14 is fitted in the locking portion 11A of the.

The bracket 12 is provided at the upper and lower ends by fitting the upper and lower end portions to the claw portions 7A and 8A which are respectively provided inwardly protruding from the wheel guide portion 7 and the roller guide portion 8 of the guide rail B. The set screw 12B is engaged with the screw hole 12A, and the tip of the set screw 12B is engaged with the guide rail B so as to be fixed. The guide line 14 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 such as vinyl chloride. As shown, the mark 15 indicating the polarity is printed.

Further, as shown in FIG. 4, the pickup unit P has five ferrites 21 each having an E-shaped cross section, and a central convex portion 21A thereof is oriented laterally (in a direction along the guide rail B in FIG. 1). ), A ferrite plate 22 is placed on the convex portion 21A at the center of each ferrite 21, and the ferrite plate 22 and the ferrite plate 22 are fixed to the base body 24 with screws 24A via the nonmagnetic plate 23. Also, for example, 10
~ 20 turns of the above litz wire and pick up coil
25, and a mounting member 26 is mounted on a side portion of the base body 24. Further, urethane rubber 26A is inserted between the folded portions of the ferrite 21 and the plate 23 at both ends. As shown in FIG. 3, the mounting member 26 allows the pickup unit P to be guided by a guide rail in which the center L of the central convex portion 21A of the ferrite 21 of the pickup unit P is approximately at the center of the pair of guide lines 14 of the guide line unit X. It is fixed to the vehicle body V by adjusting so as to be positioned perpendicular to B. When the induction line 14 is energized (alternating current), an electromotive force is generated in the pickup coil 25.

The circuit configuration of the power supply device M, the adjusting unit J, and the vehicle body (moving body) V will be described with reference to the circuit diagram of FIG. The power supply device M includes an AC 200 V three-phase AC power supply 31, a converter 32, a sine wave resonance inverter 33, an overcurrent protection transistor 34, and a diode 35. The converter 32 is composed of a diode 36 for full-wave rectification, a coil 37 that forms a filter, a capacitor 38, a resistor 39, and a transistor 40 that short-circuits this resistor 39, and the sine wave resonant inverter 33 is a rectangular wave shown in the figure. Transistors 41 and 42 that are alternately driven by signals, a current limiting coil 43, a current supply coil 44 that is connected to the transistors 41 and 42, and are connected between the coil 44 and each of the transistors 41 and 42. It is composed of diodes 70 and 71. The transistor control device is omitted.

The adjustment unit J includes a dummy coil unit F connected in series to the induction line 14, and a capacitor 45 connected to both ends of the coil 44 of the inverter 33 to form a resonance circuit with the induction line 14 and the dummy coil unit F. , An auxiliary coil 46 connected in parallel to the guide line 14. Further, both ends of the capacitor 45 and a capacitor 57, which will be described later, are connected to each other by a zero impedance cable 58.

As shown in FIG. 6, the dummy coil unit F is provided with a pair of concentric drums 51A and 51B which can be moved toward and away from each other, and the above-mentioned litz wire is wound around these drums 51 a plurality of times to form coils 52A and 52B. Is formed and one end thereof is connected, and the guide line 14 is connected to the other end.

Further, as shown in FIG. 5, when the laying distance of the guide line 14 becomes long, the current and voltage flowing due to the inductance of the guide line 14 are reduced, and sufficient electromotive force cannot be generated in the pickup coil 25 of the moving body. Therefore, a plurality of capacitors 57 are connected in parallel between the pair of dielectric lines 14 at a predetermined interval, and both ends of the adjacent capacitors 57 are connected to each other by a zero impedance cable 58. For example, 1000 V is generated between the lines 14. In addition, the transistors 41 and 42 of the inverter 33 are normally switched alternately (0 V switching) when the voltage across the capacitor 45 becomes 0 V, and the capacitors 45 and 57 of the entire circuit are connected through the zero impedance cable 58. If they are coupled, a transient high-frequency pulse current is generated due to a delay in switching operation, which causes a problem that the transistors 41 and 42 become unusable due to overcurrent and overvoltage. The diodes 70 and 71 are provided to deal with this.

As shown in FIGS. 2 and 3, the capacitor 57 and the zero impedance cable 58 are disposed on the lateral side of the guide rail B on the side where the guide line unit X is not provided.

Further, the vehicle body V is provided in parallel with the pickup coil 25, and is provided with a capacitor 62 constituting a resonance circuit which resonates at the frequency of the pickup coil 25 and the induction line 14, and is arranged in parallel with the capacitor 62 of the resonance circuit for rectification. diode
63, and a stabilized power supply circuit 64 for controlling the output to a predetermined voltage is connected to the diode 63.
Is connected to a load, for example, the motor 4 via an inverter 65. The stabilized power supply circuit 64 includes a current limiting coil 66, an output adjusting transistor 67, a diode 68 and a capacitor 69 which form a filter. The transistor control device is omitted.

Further, as shown in FIG.
Since the polarities of the guide line 14 connected to both ends of 57 are opposite, care must be taken when laying the guide line 14. Therefore, as shown in FIG. 7B, by using the mark 15 printed on the coating of the guide line 14 to indicate the polarity of the guide line 14 at the time of connection, it is possible to eliminate the connection mistake. Further, as shown in FIG. 7C, the induction line 14 is formed by twisting seven litz wires 59 around a core portion 60, and each litz wire is connected to a terminal 61 provided on a capacitor 57. Connected. Therefore, the effect of the skin effect can be reduced and a large induced current can flow.

Drum 51 of the dummy coil unit F
By adjusting the distance x between A and 51B, the resonance frequency of the guide line 14 can be adjusted to a predetermined resonance frequency. That is, the rated voltage at the beginning of the induction line 14 is v, the rated current of the induction line 14 is i, the predetermined resonance frequency of the induction line 14 is f, the inductance of the induction line 14 is L _G , and the inductance of the dummy coil unit F is L. _{If F} , v = i · 2πf
Since (L _G + L _F ), L _F = v / (i · 2πf) −L _G (1)

Since the inductance L _G of the guide line 14 is determined by the length of the guide rail B, in order to obtain a predetermined voltage, current and resonance frequency, the inductance of the dummy coil unit F is set to L _F as described above. 1) It should be adjusted so as to satisfy the formula. In FIG. 6, the first coil
Assuming that the inductance of 52A is L ₁ , the inductance of the second coil 52B is L ₂ , and the diameter of the drum 51 is d, L _F = L ₁ + L ₂ + k · (L ₁ · L ₂ ) ^1/2 (2)
(K is the degree of coupling) k = α · d · x (3) (α is a coefficient depending on the thickness of the Litz wire, the number of turns, and other conditions), so the distance x is set to the above (1) to (3). The induction line 14 can be set to have a predetermined voltage, current, and resonance frequency by calculating the distance x using the formula. In Figure 6, since the direction of the current flowing through the drum 51A, the 51B is reversed, the drum 51A, to approach the 51B, the inductance L _F decreases, moved away, the inductance L _F increases.

Further, the primary side power v · i {= i²・ 2πf
・ (L_G+ L_F)} Is the output power of the secondary side (vehicle body V side)
Needs to be larger, and the number of moving bodies (vehicles) V increases
If the output power on the secondary side increases, the power on the primary side will increase accordingly.
Need to increase. Normally, the output voltage v of the power supply device M is
Since there is an upper limit, frequency f, inductance (L_G+ L
_F), The current i decreases. Therefore,
The auxiliary coil 46 (inductance is L '),
By connecting in parallel, i²・ 2πf · L 'only 1
Secondary side power can be increased and secondary side (vehicle body V side) output
Can be greater than power.

The adjusting unit J is shown in FIG.
As shown in (b), the coil of the dummy coil unit F
It is also possible to connect both ends of 52A and 52B to the opposing inductive line 14 and connect the auxiliary coil 46 to the inductive line 14 in series or in parallel. Similarly, the inductive line 14 can be configured to have a predetermined voltage, current and resonance. The frequency can be adjusted and the primary power can be adjusted.

The operation of the circuit configuration of the power supply device M, the guide line 14, the dummy coil unit F and the vehicle body V will be described. First, AC200 V three-phase AC output from the AC power supply 31 is converted into DC by the converter 32, and converted into high frequency by the sine wave resonance inverter 33, for example, into a sine wave having a resonance frequency of 10 kHz adjusted by the dummy coil unit F. Is supplied to the guide line 14. Also transistor 4
The high-frequency pulse current generated during switching of 1 and 42 is blocked by the inductance of the first-stage induction line 14 adjacent to the resonance capacitor 45, flows through the entire circuit, and is prevented from returning to the transistors 41 and 42. .

Due to the magnetic flux generated in the guide line 14, a large electromotive force is generated in the pickup coil 25 of the vehicle body V located on the guide rail B resonating at the frequency of the guide line 14, and the alternating current generated by the electromotive force is generated. Is a diode 63
Is rectified by the stabilized power supply circuit 64, regulated to a predetermined voltage by the stabilized power supply circuit 64, and supplied to the electric motor 4 with a speed reducer via the inverter 65. 2 is driven and guided by guide rail B to move.

As described above, power can be supplied to the vehicle body V without contact, so that abrasion and dust of the current-carrying rail L as in the conventional case can be eliminated and maintenance-free can be realized. Furthermore, the dummy coil unit F
By adjusting the reactance L _F of the guide rail B, even if the length of the guide rail B is changed, the guide line 14 can have a predetermined voltage, current and resonance frequency. Also auxiliary coil 46
Are connected in parallel or in series, the primary side electric power can be increased and can be made larger than the output electric power on the secondary side (vehicle body V side). The dummy coil unit F reactance L _F drums 51A, by adjusting a distance x between 51B, conditions can be easily adjusted in the field if it becomes unclear when or changes. Further, it is possible to eliminate the need to design a circuit by the length of the guide line 14 and shorten the delivery time.

Further, the induction line 14 and the pickup coil 25
By using a litz wire covered with an insulator for the dummy coil unit F, the exposed conductive parts are lessened, and safety can be improved, and since the sparks disappear, there is no danger of fire or the like. Also, it can be used in the explosion-proof area. In addition, the guide line
Since a sine wave is fed to 14, no harmonic is generated and radio noise can be eliminated.

In this embodiment, two guide lines 14 are laid on the guide rail B. However, when two guide lines 14 cannot be laid on the guide rail B, only one guide line 14 is laid. The pickup coil 25 may be laid along the guide rail B, and the other guide line 14 may pass through another path so that the pickup coil 25 moves only close to one guide line 14. Needless to say, the power is reduced at this time. Further, two or more guide lines 14 can be laid on the guide rail B to increase power.

Further, although the vehicle body V that moves in the left-right direction is described in this embodiment, a vehicle body that moves in the vertical direction along the rail track may be guided by a guide path (moving body). ) Can be similarly applied, and the same effect can be expected.

Further, in the present embodiment, the drum 51 is constructed so that it can be moved toward and away from the dummy coil unit F in the left-right direction, but it may be moved toward and away from the vertical direction, and the diameter of the drum 51 can be changed. Although d is the same, they may be different as long as the inductance can be adjusted. Further, although the dummy coil unit F is connected to the start end of the guide line 14, it may be inserted in the middle or at the end. Further, although adjusting the inductance of the inductive line 14 by the dummy coil unit F, the combined capacity c of the resonance capacitor 45 to the length of the guide rail B, c = 1 / {( 2πf) 2 L G} and adjustment By doing so, a predetermined resonance frequency can be obtained, but a high-frequency capacitor is expensive, and there is a problem of noise because a beat noise is generated, which is not practical.

[0034]

As described above, according to the first invention,
The resonance frequency that changes depending on the length of the line can be adjusted to a predetermined resonance frequency by adjusting the inductance of the coil, and it is possible to stably and efficiently supply power to the moving body. It is possible to eliminate the need to do it and shorten the delivery time. Also the sine
Switching of the transistors that make up the wave resonant inverter
High-frequency pulse current is generated transiently due to delay in operation
However, if an overcurrent or overvoltage occurs in the transistor,
The transistor becomes unusable
And a coil for current supply connected to these transistors
Prevent by connecting diodes respectively
be able to.

According to the second invention, the laying distance of the line is
As the length increases, the electric current flowing due to the inductance of the line
Current and voltage are reduced, which is sufficient for the pickup coil of a moving object.
A pair of lines
Connect multiple capacitors in parallel at a specified interval between
Zero impedance across the capacitor
・ Can be resolved by connecting with a cable
It

[Brief description of drawings]

FIG. 1 is a side view of a non-contact power feeding facility for a mobile body according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view of the contactless power supply equipment for the mobile unit.

FIG. 3 is a side view and a plan view of a bracket of the contactless power feeding facility of the mobile body.

FIG. 4 is a plan view, a front view, and a side view of a pickup coil of the contactless power supply equipment for the mobile unit.

FIG. 5 is a circuit configuration diagram of the contactless power feeding facility of the mobile body.

FIG. 6 is a configuration diagram of a dummy coil unit of the contactless power feeding equipment of the mobile body.

FIG. 7 is an explanatory diagram regarding connection of a guide line of the contactless power feeding facility of the same mobile body.

FIG. 8 is a circuit diagram showing a modified example of the adjustment unit of the contactless power supply equipment for the mobile unit.

[Explanation of symbols]

B Guide rail F Dummy coil unit J Adjusting unit M Power supply device P Pickup unit V Car body X Guide line unit 11 Hanger 11A Locking part 12 Bracket 14 Guide line 15 Mark 25 Pickup coil 33 Sine wave resonance inverter 45 Resonance with induction line Capacitor forming circuit 46 Auxiliary coil 51 Drum 52 Coil 57 Capacitor 58 Zero impedance cable 62 Capacitor forming resonance circuit with pickup coil

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02J 17/00 B60L 5/00 B60M 7/00 B65G 43/00

Claims (2)

(57) [Claims] 1. A coil in which a pair of lines that oscillate a high-frequency sinusoidal current that resonates with a capacitor is laid along a traveling path along which a moving body travels, and the inductance is variable in series or in parallel with the lines. Connect this coil and the line
A capacitor that forms a resonant circuit is provided, wherein the mobile resonates to the frequency of the line, providing a pick-up coil electromotive force occurs, the line to the sine wave resonator for supplying the sinusoidal current inverter
The resonance circuit that forms the sinusoidal resonance inverter.
When the voltage across the capacitor is 0V, the
Transistors that switch each other and these transitions
Between the coils for current supply connected to the
Are connected to each other and these diodes
Due to delay in switching operation of the transistor, transient high frequency
Wave pulse current is generated, and the transistor is overcurrent, overvoltage
To prevent the transistor from becoming unusable due to
This is a non-contact power feeding facility for moving objects. 2. A plurality of coils at a predetermined interval between the pair of lines.
Capacitors in parallel and between both ends of adjacent capacitors.
Connected to each other with a zero impedance cable.
The contactless power feeding equipment for a mobile body according to claim 1.