JP3295963B2 - 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 supply system for a mobile unit, and more particularly to a non-contact power supply system for a self-propelled transport vehicle that conveys a load guided on a rail track.

[0002]

2. Description of the Related Art A conventional moving body and its power supply device will be described with reference to FIGS. The transporting vehicle body V as a moving body is composed of a drive trolley 1A, a driven trolley 1B, and an article transporting carrier 1C supported by these trolleys 1A and 1B, and a guide rail B for movably guiding the vehicle body V. Are provided.

The drive trolley 1A includes a traveling wheel 2 which is engaged with an upper portion of a guide rail B, a steady roller 3 which contacts a lower portion of the guide rail B from both sides, and a current collecting unit D.
And the traveling wheels 2 are driven by an electric motor 4 with a speed reducer. The driven trolley 1B includes a traveling wheel 5 that engages with the upper part of the guide rail B, and a steadying roller 6 that contacts the lower part of the guide rail B from both sides.

The guide rail B has a wheel guide 7 at its upper part and a roller guide 8 at its lower part. The guide rail B is suspended from a ceiling or the like by a support frame 9 connected to one lateral side. An energizing rail unit U is attached to the other side of the guide rail B from the side to which the support frame 9 is attached.

The energizing rail unit U supplies electric power to the vehicle body V by three-phase alternating current, and outputs a traveling control signal to the vehicle body V.
A pair of upper and lower locking portions 11 provided on the guide rail B is provided with four energizing rails L, and a rail support frame 10 for supporting the energizing rails L in a parallel state. It is screwed in a state where it is locked.

As shown in FIG. 8B, the energizing rail L is a rail body 12 formed of a conductive material such as copper.
And a holder 13 formed of a non-conductive material such as a synthetic resin.
The holder 13 is provided with a pair of protective walls protruding from both lateral sides of the rail body 12 to the current collector side,
The collector contact surface of the rail body 12 is formed as a recessed surface that is located closer to the center in the rail width direction.

[0007] As shown in FIG.
Each of the energizing rails L is provided with a pair of current collectors 14.
A pair of current collectors 14 for one energizing rail L are located at an interval in the front-rear direction of the vehicle body V, and the four current collectors 14 at the front of the vehicle body are combined into one unit, and similarly, the four current collectors 14 at the rear of the vehicle body are combined. The electrons 14 are combined into one unit.

With the above structure, the vehicle body V of the moving body is supplied with power from the power supply rail L of the power supply rail unit U of the guide rail B via the current collector 14, and the traveling wheels are driven by the supplied electric motor 4 with a speed reducer. 2 is driven and guided and moved by the guide rail B.

[0009]

However, in such a conventional power supply equipment for a mobile body, the rail main body of the power supply rail L is not provided.
Since the 12 and the current collector 14 are worn by contact with each other, maintenance is indispensable, and there is a problem that dust is generated. Furthermore, since the conductive material (rail main body 12) of the energizing rail L is exposed, there is a risk of electric shock, and furthermore, a spark is generated, so that it cannot be used in an explosion-proof area.

In order to solve such a problem, a non-contact power supply facility as shown in FIG. 9 has been proposed. The contactless power supply equipment shown in FIG. 9 includes a primary core 21 fixed to a charging station of a mobile unit, and a mobile unit stopped at this station.
A secondary core 23 vertically provided below the bottom 22 is provided with a magnetic path facing the gap length g to transmit electric power.
That is, the primary core 21 provided in the charging station
When an alternating current is applied to the coil 24 wound around the secondary coil 23, an electromotive force is generated in the coil 25 wound around the secondary core 23, and the alternating current generated in the coil 25 passes through an AC-DC converter 26. To the battery 27, and the battery 27 is charged. The moving body 22 travels by driving the traveling wheels 28 using the battery 27 as a driving power source.

However, in such a configuration, the battery is not charged unless it is stopped once at the charging station, so that the working efficiency is poor, and such a problem can be solved by laying the primary core 21 along the traveling path. However, it was difficult to manufacture and was impossible in terms of cost. Further, since the inductance on the primary side greatly changes due to the change in the gap length g,
Since the primary-side current value greatly changes and the secondary-side voltage value greatly changes, an overcurrent and an overvoltage occur, and the protection device may operate and power may not be supplied.

The present invention solves the above problem,
It is an object of the present invention to provide a non-contact power supply facility for a mobile body capable of supplying power safely and stably without contact.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a contactless power supply system for a moving object according to the present invention comprises a pair of upper and lower members projecting horizontally along one lateral side of a rail track on which the moving object moves. At the tip of the hanger, an induction line through which a high-frequency sine-wave current flows is provided, and the moving body is provided with a coil over the upper, middle, and lower protrusions of a magnetic member having an E-shaped cross section. The coil formed by winding is fixed so that the upper and lower surfaces of the coil are along the guide line, and the centers of upper and lower concave portions of the magnetic member are located at the respective guide lines. .

[0014]

According to the structure of the present invention, the coils are fixed to the movable body by substantially positioning the centers of the upper and lower concave portions of the magnetic member on the respective guide lines. A magnetic path is generated in the upper and central protrusions, and the lower and central protrusions, and by winding the coil around the upper, central, and lower protrusions, an electromotive force is efficiently induced in the coil,
Therefore, power is efficiently supplied to the vehicle body without contact. In addition, the coil does not come into contact with the guide line even in the curved portion of the rail track, and the moving body can smoothly bend the curved portion.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. The same components as those in FIGS. 7 and 8 of the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 is a side view of the contactless power supply equipment for a moving body of the present invention, and FIG. 2 is a partial cross-sectional front view of the moving body of the contactless power supply equipment of the moving body of the present invention. In the non-contact power supply equipment for a moving body according to the present invention, the guide rail B is provided with a guide line unit X instead of the conventional energizing rail unit U, and the vehicle body V is provided with a pickup unit instead of the conventional current collecting unit D. P, and a power supply device M.

The guide line unit X is provided with a bracket 32 having a pair of upper and lower hangers 31 vertically protruding at predetermined intervals along the guide rail B at one lateral side of the guide rail B. At the tip, a resin duct 33 is stretched along the guide rail B, and each duct 33 is provided with a loop-shaped induction line 34 having a starting end connected to the power supply device M and a terminating end connected in a different direction of conduction. It is laid and configured. The guide line 34 is configured 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.

As shown in FIG. 3, the pickup unit P is a ferrite which is a magnetic member having a H-shaped cross section which is long in a lateral direction (along the guide rail B in FIG. 2).
35, three pickup coils 36 formed by winding the above-mentioned litz wire of, for example, 10 to 20 turns over the upper and lower concave portions, and the body V side of the ferrites 35 of these pickup coils 36 is a ferrite plate. 37 side top,
The ferrite plate 37 is attached to the center and the lower part so as to be positioned laterally, and plate-like attachment members 38 are vertically attached to both ends of the ferrite plate 37. The ferrite plate 37 and the ferrite 35 form a magnetic member having an E-shaped cross section. As shown in FIG. 3 (c), the mounting member 38 is provided with a vertically long mounting hole 38A having a semicircle at both ends. The mounting member 38 and a pair of support members 39 protruding from the vehicle body V toward the guide rail B are connected by bolts 40A penetrating between the mounting holes 38A, 39A, as shown in FIG.
The pickup coil 36 of the pickup unit P is moved in the vertical direction so as to be located along the guide line 34 and substantially at the center of each of the upper and lower concave portions of the E-shaped magnetic member of the pickup unit P. Adjustment, rotate the pickup unit P as shown by the arrow, and adjust,
It is fixed to the vehicle body V by tightening the nut 40B. When the induction line 34 is energized (alternating current), an electromotive force is generated in the pickup coil 36.

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 includes 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 drawing, a current limiting coil 53, and a current supply coil 54 connected to the transistors 51 and 52, It comprises an induction line 34 and a capacitor 55 forming a parallel resonance circuit. Note that the transistor control device is omitted.

The vehicle body V is provided with a capacitor 56 constituting a resonance circuit that resonates with the frequency of the pickup coil 36 and the induction line 34 in parallel with the pickup coil 36, and a rectifier for rectification is provided in parallel with the capacitor 56 of the resonance circuit. diode
57, and a stabilized power supply circuit 58 for controlling the output to a predetermined voltage is connected to the diode 57.
, For example, the motor 4 is connected via an inverter 63. 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 constitute a filter. Note that the transistor control device is omitted.

The operation of the power supply device M, the guide line 34 and the vehicle body V will be described. First, AC 200 V three-phase AC output from the AC power supply 41 is converted into DC by the converter 42,
For example, it is converted into a 10 kHz sine wave and supplied to the induction line 34. Due to the magnetic flux generated in the guide line 34, a large electromotive force is generated in the pickup coil 36 of the vehicle body V located on the guide rail B resonating with the frequency of the guide line 34, and the alternating current generated by the electromotive force is a diode 57. , Is regulated to a predetermined voltage by the stabilized power supply circuit 58, and is supplied to the electric motor 4 with a speed reducer via the inverter 63. The vehicle body V of the moving body is driven by the powered wheels 4 2 is driven and guided and moved by the guide rail B.

As described above, power can be supplied to the vehicle body V without contact, so that wear and dust of the current-carrying rail L as in the related art can be eliminated, and maintenance-free operation can be realized. In addition, since the pickup unit P is fixed such that almost the centers of the upper and lower concave portions of the magnetic member are located on the respective guide lines 34, as shown in FIG. High ferrite plate 37
Then, a magnetic path is generated in the three ferrites 35, and an electromotive force is efficiently induced in each of the pickup coils 36, so that power can be efficiently supplied. Further, each pickup coil 36 does not come into contact with the guide line 34 even in the curved portion of the guide rail B, so that the vehicle body V can smoothly bend the curved portion. The cross section is H
By forming a pickup coil 36 by winding a litz wire over the upper and lower concave parts on the ferrite 35 of the shape,
Since the litz wire is held by the convex portions at both ends, the litz wire is easily wound, and the work efficiency can be improved.

Since the length of the guide line 34 is much longer than the length of the pickup coil 36, for example, the length of the pickup coil 36 is 100 m for the length of the guide line 34.
Since it is 10 to 15 cm, the primary inductance of the induction line 34 is substantially constant, and the capacitor 55 of the power supply device M
And the induction line 34 constitute a resonance circuit, so that a high-frequency sinusoidal primary current can be passed through the induction line 34 with a substantially constant large current value.
By secondary side 36 is resonant circuit, as shown in FIG. 6, the resonance frequency f _o with a large voltage on the secondary side v (in the drawing
1000-2000V), and even if the gap length between the induction line 34 and the pickup coil 36 changes, or if the frequency of the induction line 34 fluctuates somewhat, the resonance frequency on the secondary side further increases the frequency of the induction line 34. even if some change from, the frequency f ₁ ~f ₂
In this range, a secondary voltage exceeding a predetermined value (300 V in the figure) or more can be generated, so that large power can be supplied stably. Therefore, the gap length can be roughly adjusted, the workability is improved, and the production can be facilitated. In addition, since a core is not required on the primary side, a line can be easily laid at low cost.

Further, an induction line 34 and a pickup coil 36
The use of litz wire covered with an insulator eliminates the exposure of conductive parts and enhances safety, and eliminates sparks, eliminating dangers such as fire and also used in explosion-proof areas. It is possible to do. Further, since a sine wave is supplied to the induction line 34, no harmonic is generated, and generation of radio noise can be eliminated.

In this embodiment, two guide lines 34 are laid on the guide rail B. However, two or more guide lines 34 may be laid on the guide rail B to increase power. it can.

Further, in this embodiment, the vehicle body V which moves in the left-right direction is described. However, the present invention can be similarly applied to a vehicle body (moving body) which moves in the vertical direction along the rail track, and the same effect can be obtained. Can be expected.

In this embodiment, the mounting position of the pickup unit P can be adjusted by the structure of the mounting hole 38A of the mounting member 38. However, the present invention is not limited to such a structure. Any structure can be used as long as the structure can adjust.

[0028]

As described above, according to the present invention, an electromotive force is generated in the coil, and the moving body is supplied with electric power in a non-contact manner even during traveling, so that the current-carrying rails are worn and dust as in the prior art. Can be eliminated, and maintenance-free operation can be realized. When the coil is energized (alternating current) through the induction line, since the coil is positioned such that the center of each of the upper and lower concave portions of the magnetic member is positioned on each of the induction lines, the upper and lower protrusions and the lower portion of the magnetic member A magnetic path is generated at the central projection, and the coil is wound around the upper, central, and lower projections, so that an electromotive force is efficiently generated in the coil, so that power can be efficiently supplied to the vehicle body without contact. . In addition, the coil does not come into contact with the guide line even in the curved portion of the rail track, and the vehicle body can smoothly bend the curved portion. Further, since the current flowing through the line is a sine wave, no harmonic is generated, and generation of radio noise can be eliminated. Further, since a core is not required on the primary side, a line can be easily laid at low cost.

[Brief description of the drawings]

FIG. 1 is a side view of a non-contact power supply facility for a moving object according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view of a non-contact power supply facility of the moving body.

FIG. 3 is a plan view, a front view, and a side view of a pickup coil of the contactless power supply equipment of the moving object.

FIG. 4 is a circuit configuration diagram of a non-contact power supply facility of the moving body.

FIG. 5 is an explanatory diagram of generation of a pick-up coil electromotive force of the contactless power supply equipment of the moving object.

FIG. 6 is a graph showing secondary-side frequency-electromotive force characteristics of the contactless power supply equipment of the mobile object.

FIG. 7 is a side view of a conventional moving body and a power supply device.

FIG. 8 is a partial cross-sectional front view of a conventional moving body and a power supply device.

FIG. 9 is a configuration diagram of a conventional wireless power transfer facility for a mobile object.

[Explanation of symbols]

V Car body B Guide rail X Induction line unit P Pickup unit M Power supply 34 Induction line 35 Ferrite 36 Pickup coil 37 Ferrite plate 38 Mounting member 39 Support member 40 Bolt / nut 43 Sine wave resonance inverter 56 Pickup coil and resonance circuit Forming capacitor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-120328 (JP, A) JP-A-63-302704 (JP, A) JP-A-5-207606 (JP, A) 108002 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60L 5/00 H01F 23/00

Claims (1)

(57) [Claims] An induction line through which a high-frequency sine-wave current flows is provided at a tip of a pair of upper and lower hangers protruding horizontally along one lateral side of a rail track on which a moving body moves. A coil formed by winding a coil over the upper, lower, upper and lower surfaces of a magnetic member having an E-shaped cross section on the upper, lower, and upper surfaces thereof is formed on the body. A non-contact power supply equipment for a moving body, wherein substantially the center of each of the upper and lower concave portions of the member is positioned and fixed to each of the guide lines.