JP2002118988A - Non-contact feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the length of an effective feeder line capable of feeding transformers by supplying a given current based on a specified power supply voltage with one unit of a power supply without increasing the impedance of the feeder line. SOLUTION: A feeder line 42a and another line 42b of the same length are connected parallel to the power supply 41. From the feeder line 42a, electric power is supplied to the transformers 44a, 45a. Also, from the feeder line 42b, electric power is supplied to the transformers 44b, 45b. Each of the transformers 44a, 45a, 44b, 45b moves freely between the feeder lines 42a, 42b, so that it can be fed from either feeding lines. Thus, because the wiring of the feeder lines 42a, 42b for every system is short, impedance becomes small and power loss becomes smaller. The lengths of the feeder lines by which each of the transformers 44a 45a, 44b, 45b can be fed can be made equal to the sum of the lengths of the feeder line 42a and the other line 42b. That is to say, the length of the feeding lines can be doubled.

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 device for supplying power used to a traveling body traveling along a track in a non-contact manner, and more particularly to a power supply device for reducing a power loss of a primary side power supply line. And a non-contact power supply device that efficiently supplies power.

[0002]

2. Description of the Related Art Heretofore, in a warehouse or a factory, a transport system has been widely used in which a transport vehicle travels along a track such as a guide rail, and the transport vehicle transports an object (load). . A traveling motor such as a linear motor is mounted on the carrier, and the carrier is driven by driving the traveling motor. Then, as a method of supplying power to the traveling motor, a secondary winding called a pickup coil is provided on the side of the transport vehicle instead of a method of supplying power by contacting a current collector provided on the transport vehicle with a power supply line. A method of arranging the pickup coil in the vicinity of a primary-side power supply line and generating an induced electromotive force in the pickup coil by a so-called electromagnetic induction action of a transformer to supply power in a non-contact manner has been implemented.

Next, the principle of power supply of a conventional non-contact power supply device will be described in detail with reference to FIGS. FIG. 1 is a conceptual diagram in which a transport vehicle B travels on a track R having a curved portion and a straight portion, and FIG. 2 shows a relationship between a primary power supply line 10 and a power supply device 20 mounted on the transport vehicle B. FIG. 3 is a cross-sectional view showing a feed transformer (transformer) 21 around which a pickup coil (secondary coil) 23 is wound and a track side wall Wa, and FIG. FIG. 1 is a system configuration diagram of a non-contact power supply device.

In FIG. 2 and FIG. 3, a single feeder line 10 on the primary side is bent beside the track side wall Wa constituting the track R so that the feeder lines 10a and 10b are vertically spaced at a predetermined interval. And at a certain distance from the track side wall Wa in parallel to the track side wall Wa. In addition, as shown in FIG. 3, each of the power supply lines 10a and 10b is supported via a stay 1 on a side surface of the track side wall Wa. In the following description, the non-contact power supply transformer is simply referred to as a power supply transformer as appropriate.

[0005] As shown in FIG. 2, the carrier traveling along the track is equipped with a power supply device 20, and a power supply transformer 21 constituting the power supply device 20 is as shown in FIG. 3. A pickup coil 23 as a secondary coil is wound around a central convex portion 22a of a core 22 having an E-shaped cross section, and a central convex portion 22a and an upper convex portion 22b of the core 22 are wound.
And one power supply line 10a obtained by bending one power supply line 10 into two, and a central convex portion 22a
The other power supply line 10b is arranged between the power supply line 10b and the lower protrusion 22c.

When a high-frequency current is supplied to the primary-side feeder line 10, each of the two feeder lines 10a, 1b is bent.
Since the directions of the currents flowing in the direction 0b are opposite to each other, magnetic fluxes in opposite directions are generated as shown by arrows in FIG. An induced electromotive force is generated in the pickup coil 23 (that is, a voltage is induced), and power is supplied from the primary power supply line 10 to the secondary coil (the pickup coil 23) in a non-contact manner.

[0007] As shown in FIG. 2, the power supply device 20 of the transport vehicle includes a resonance capacitor 24, a rectifier circuit 25, a constant voltage circuit 26, and a driver 27. Is converted to a direct current by a rectifier circuit 25, and is then controlled to a constant voltage by a constant voltage circuit 26 and supplied to a traveling motor 28.
As shown in FIG. 1, the transport vehicle B moves the track R
Follow along. Further, in the power supply device 20 of the transport vehicle, a resonance circuit is formed by the pickup coil 23 and the resonance capacitor 24 connected in parallel to the pickup coil 23. The resonance circuit reduces reactive power during non-contact power supply, Increases power transmission efficiency.

FIG. 4 shows a configuration in which three carrier vehicles are individually equipped with a power supply transformer and a power supply device to supply power to a traveling motor. That is, one power supply 31 is connected to one system feed line 32 and the resonance capacitor 3.
3, and three power supply transformers 34a, 34b, 34c are individually supplied with power from the power supply line 32 in a non-contact manner. And each power supply transformer 34
a, 34b, 34c to the respective power supplies 35a, 3
Electric power is transmitted to 5b and 35c, and electric power is supplied from the power supply device 20 to each traveling motor as shown in FIG. In this way, each carrier can travel individually on the track.

[0009]

In the above-described non-contact power supply device, the length of the power supply line that can be supplied from one power supply is required because the current value of the primary side power supply line must be maintained at a specified value. Is uniquely determined by the power supply voltage and the impedance of the power supply line. That is, when the power supply voltage is constant, the impedance increases as the length of the power supply line increases, and a specified primary-side power supply line current cannot be obtained. Therefore, the length of the power supply line must be set to a length at which a current value determined by the power supply voltage and the impedance is obtained.

Therefore, when the track length becomes longer and the line length of the feeder line needs to be increased, measures such as increasing the power supply voltage or installing a plurality of power supplies are employed to reduce the specified current value. Need to be secured. However, when the power supply voltage is increased to supply a specified current value to the power supply line, the specified current can be secured for a long power supply line, but the power supply line must be covered to maintain the withstand voltage of the power supply line. The thickness must be increased, and there arises a problem that the feeder line cannot be incorporated into the feeder transformer. In addition, if a plurality of power supplies are prepared to supply a specified current value to the power supply line, and power is supplied for each predetermined length of the power supply line, the non- There is a problem that the cost of the contact power supply device is increased.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a power supply line on a primary side with a specified current without increasing a power supply voltage or increasing the number of power supplies. The purpose of the present invention is to make it possible to supply a value and to substantially extend the line length of the feed line.

[0012]

In order to solve the above-mentioned problems, a contactless power supply device according to the present invention has a power supply transformer mounted on a traveling body facing a track side wall, and is wired along the track side wall. Non-contact power supply is performed by magnetic coupling between the primary-side power supply line and the secondary winding wound around the power supply transformer, and the traveling body travels based on the power supplied to the secondary winding. In the non-contact power supply device, the primary-side power supply line is connected in parallel to a single power supply that supplies power over a plurality of systems.

According to this configuration, for the same power supply,
The length of the feeder line per system is reduced, and the impedance is reduced. As a result, the required primary feeder current can be secured without increasing the power supply voltage. In addition, if the number of systems is increased, the required line length of the power supply line can be obtained. Therefore, even when the power supply voltage is the same as the conventional condition, it is possible to substantially extend the line length of the power supply line while securing the required primary power supply line current.

Here, the plurality of primary feeder lines are
For example, it is made of a conductor of a return round trip path whose impedance is set to be substantially equal. The plurality of primary-side feeder lines form, for example, a resonance circuit having a predetermined resonance frequency with respect to the power supply. Further, the plurality of primary power supply lines are connected so that the power supply transformer can move between the plurality of primary power supply lines.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of a contactless power supply device according to an embodiment of the present invention. FIG. 5 is a system diagram of a contactless power supply device in which two power supply lines are connected in parallel to a power supply in the embodiment of the present invention. That is, FIG. 1 shows a state in which two power supply lines are connected in parallel by one power supply, and a power supply transformer is connected to each power supply line. It should be noted that two or more feeder lines can be connected in parallel to one power supply, but for the sake of simplicity, in the following description, two feeder lines are connected to one power supply. Are connected in parallel.

In FIG. 5, a resonance capacitor 43 is connected to one power supply 41 in parallel, and one power supply line 42a and another power supply line 42b are connected in parallel. Then, for one feeder line 42a, 2
The power supply transformers 44a and 45a are individually and magnetically connected in a non-contact manner. These power supply transformers 44
a, 45a to the power supply devices 46a, 47a, respectively, and as shown in FIG.
The configuration is such that electric power is supplied from 6a, 47a to each traveling motor. Similarly, another system feed line 42b
, Two power supply transformers 44b and 45b are magnetically connected in a non-contact manner, and power is transmitted from the power supply transformers 44b and 45b to the power supply devices 46b and 47b, respectively. I have.

Here, the resonance capacitor 43 and the plural feed lines 42a and 42b form a resonance circuit having a predetermined resonance frequency with respect to the power supply 41. By flowing a high-frequency current having a resonance frequency through the power supply line 42a, the power supply transformers 44a,
The power is supplied to the power supply devices 46a and 47a via 5a. Similarly, a high-frequency current having a resonance frequency is supplied to the power supply line 42b to supply power to the power supply devices 46b and 47b via the power supply transformers 44b and 45b. Then, as shown in FIG. 2 described above, electric power is supplied from each power supply device to each traveling motor. Power is thus supplied, and each carrier (traveling body) on which each of the power supply devices 46a, 47a, 46b, and 47b is mounted travels individually.

Therefore, as shown in FIG.
If two feeder lines 42a, 42b are connected in parallel to each other, each feeder transformer 44a, 45a, 44b, 45b
Travels freely through the two feed lines 42a and 42b,
Electric power can be supplied from each of the power supply lines 42a and 42b. That is, in this embodiment, the length of the feed line that the feed transformer can supply substantially without increasing the feed line length per system (that is, without increasing the impedance) is doubled. Can be longer.

In this manner, a specified current can be supplied from the power supply 41 to the low impedance power supply line 42a, so that required power can be supplied to the power supply transformers 44a and 45a. Similarly, a specified current can flow from the power supply 41 to the low-impedance power supply line 42b, so that required power can be supplied to the power supply transformers 44b and 45b.

In this embodiment, the power supply line 42a and the power supply line 42b have substantially the same length, and their impedances are set to substantially the same value. That is, the lengths of the feed lines of the two systems are adjusted so that the impedances of the feed lines of the respective systems have the same value. If you do this,
The current values flowing through the feeder lines of each system become equal, and power can be supplied to each feeder line in a well-balanced manner.

If the power supply lines are arranged in parallel in two systems in this way, the length of the power supply lines can be doubled under the same conditions as the conventional power supply voltage. In addition, the feed line
If N is a natural number and the power supply voltage is the same as in the conventional case, the length of the power supply line can be substantially increased N times within the limit of the current supply capability of the power supply. Therefore, it is not necessary to increase the power supply voltage in order to increase the line length of the power supply line as in the related art, and thus it is not necessary to use a cable having a high withstand voltage.

Next, a description will be given of an example of laying the two power supply lines and an example of an operation in which the carrier moves across the two power supply lines when the two power supply lines are connected in parallel. FIG.
Is an example of a case where a system of a non-contact power supply device including two power supply lines shown in FIG. 5 is laid on a track. That is, in FIG. 6, a power supply line 42 a and a power supply line 42 b connected in parallel to the power supply 41 are laid along a substantially circular track 48. A power supply transformer 44 is provided on the power supply line 42a side.
a and 45a are magnetically coupled, and power supply transformers 44b and 45b are magnetically coupled to the power supply line 42b side.

These power supply transformers 44a, 45a,
4b and 45b are mounted on each carrier traveling along the track 48. Here, the folded part (A
Section) has a structure in which each power supply transformer can move between power supply lines, as described later, and is connected as a track. Therefore, each carrier is supplied with power from the power supply line 42a or the power supply line 42b in a non-contact manner, and the substantially circular track 48 is provided.
Can be freely moved over the entire circumference of.

In this case, as is apparent from FIG. 6, the length of each feed line 42a, 42b is about half of the entire length of the circular track 48. However, each power supply transformer 44a, 45
a, 44b, and 45b can run on the entire circumference of the track 48, so that two independent feeder lines 42a, 42b
Can behave as a single feed line from the viewpoint of each carrier, and the line length of the feed line is substantially double that of each feed line.
The power supply 41 includes four power supply transformers 44a, 45.
It is necessary to provide a current capacity capable of supplying power to a, 44b, and 45b.

Next, a method of moving the power supply transformer between two parallel power supply lines will be described. FIG.
As shown in (1), the plurality of primary power supply lines are connected so that the power supply transformer can move between the plurality of primary power supply lines. Here, FIG. 7A is a side view of a portion A viewed from the extending direction of the feeder line, and FIG. 7B is an enlarged view of a folded end portion of the two feeder lines. As shown in FIG. 7B, the folded end 49a of the power supply line 42a is connected to the power supply line 42a.
Bend at a right angle to the wiring direction. The folded end 49b of one power supply line 42b is also bent substantially at right angles to the wiring direction of the power supply line 42b. As a result, the folded end 49 of the power supply line is retracted from the passage area of the core of the power supply transformer.

Here, as shown in FIG. 7A, the height of the folded portion at the folded end portion 49 of the feeder line 42 is such that the folded end portion 49 of the feeder line 42 is formed at the central convex portion 50 of the feeder transformer 44. The height should be such that it does not hit. Accordingly, even if the power supply transformer 44 moves along the power supply lines 42a and 42b in FIG. 7B, the folded end 49 of the power supply lines 42a and 42b does not hinder the movement of the power supply transformer, and the power supply transformer 44 is a feed line 42a and a feed line 42b
It is possible to move freely between and.

In this way, if the folded feeder line of half length is laid in parallel with the track, the power supply is substantially doubled without increasing the impedance of the feeder line. Power can be supplied to the power supply line having a length. Of course, if the number of power supply lines connected in parallel is increased, the total length of the power supply lines can be further expanded, and a long track can be accommodated.

As described above, according to this embodiment, feed lines having substantially the same impedance are connected in parallel over a plurality of systems to the same power supply, so that the currents flowing through any of the feed lines have substantially the same value. Moreover, since the length of the power supply line for each system is short, a voltage drop due to impedance is small.
Therefore, a necessary current can be supplied to the primary power supply line without increasing the power supply voltage. Further, when viewed from the secondary side, a plurality of power supply lines connected in parallel can be regarded as one system, so that the length of the power supply line can be substantially extended without increasing impedance. . That is, when the power supply voltage is the same as the conventional condition, the total length of the feed line can be extended to the sum of the line lengths of the feed lines of a plurality of systems without increasing the impedance.

The embodiment described above is an example for explaining the present invention, and the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the invention. It is. That is, in the above-described embodiment, the case where two power supply lines are connected in parallel to one power supply has been described. Of course, the same operation and effect can be obtained. Alternatively, a plurality of power supplies may be provided, and a plurality of power supply lines may be connected to each power supply in parallel. Various variations are conceivable for the method of laying such a large number of feed lines of a plurality of systems on a track according to actual use conditions.

[0030]

As described above, according to the present invention, a plurality of primary power supply lines are connected in parallel to one power supply, so that the power supply voltage can be increased or the number of power supplies can be increased. In addition, it is possible to supply a specified current value to the primary-side feeder line, and to substantially extend the line length of the feeder line.

[Brief description of the drawings]

FIG. 1 shows a transportation vehicle B along a track R having a curved portion and a straight portion.
It is a conceptual diagram which runs.

FIG. 2 is a schematic circuit diagram showing a relationship between a primary power supply line 10 and a power supply device 20 mounted on a carrier B.

FIG. 3 shows a power supply transformer (transformer) 21 around which a pickup coil (secondary coil) 23 is wound and a track side wall W
It is a cross-sectional view which shows the part of a.

FIG. 4 is a system conceptual diagram of a circuit in which a plurality of feed transformers are connected to a single feed line in a non-contact manner.

FIG. 5 is a system configuration diagram of a non-contact power supply device in which two power supply lines are connected in parallel to a power supply in the embodiment of the present invention.

FIG. 6 is a diagram illustrating an example of a case where a system of a non-contact power supply device including two power supply lines is laid on a track;

FIG. 7 is a diagram for explaining a structure of a connecting portion of a power supply line.

[Explanation of symbols]

10 (10a, 10b), 32, 42, 42a, 42b
Power supply lines 21, 34a, 34b, 34c, 44, 44a, 44
b, 45a, 45b Feeding transformer 22 Core 23 Secondary winding (Pickup coil) Wa Track side wall 31, 41 Power supply 20, 35a, 35b, 35c, 46a, 46b, 47
a, 47b Power supply device 33, 43 Resonant capacitor 48 Track 49, 49a, 49b Folded end 50 Central convex

Claims (4)

[Claims] 1. A power supply transformer is mounted on a traveling body so as to face a track side wall, and a primary power supply line wired along the track side wall and a secondary winding wound around the power supply transformer. A non-contact power supply device that supplies power in a non-contact manner by magnetic coupling and causes the traveling body to travel based on the power supplied to the secondary winding. A non-contact power supply device, which is connected to a plurality of power supplies in parallel across a plurality of systems. 2. The non-contact power supply device according to claim 1, wherein the plurality of primary-side power supply lines are formed of conductors of a return reciprocating path whose impedances are set to be substantially equal. 3. The non-contact power supply device according to claim 1, wherein the plurality of primary-side power supply lines form a resonance circuit having a predetermined resonance frequency with respect to the power supply. 4. The non-power supply according to claim 1, wherein the plurality of primary power supply lines are connected such that the power supply transformer is movable between the plurality of primary power supply lines. Contact power supply.