JP3794262B2 - Tracked cart system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a contactless power supply system that supplies power to a tracked vehicle without contact.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a technique is known in which a transport carriage is run on a track in order to transport articles in a factory or warehouse. There are internal combustion engines and motors as drive sources for these transport carts, but the drive source using an internal combustion engine that generates exhaust gas when working in a closed space such as a factory deteriorates the environment. Usually, a motor is used. The electric power for operating this motor includes a battery type and a method of supplying from an electric wire. However, in the case of the battery type, since it is necessary to charge every predetermined process (time), a charging station is provided, Whenever the power stored in the battery is consumed, it is necessary to stop at the charging station and stop charging there. For this reason, for example, in the transport system in the factory, the time for this charging is necessarily required, so that the work efficiency has deteriorated.
[0003]
Such a problem can be solved by a feeder line system, which is a contact type and a non-contact type. As a contact-type power supply line system, as seen in trains, monorails, etc., the power supply contact body is always brought into contact with the power supply line to supply power. Maintenance is indispensable in order to wear out, and it is necessary to replace | exchange parts of a contact part regularly. Also, the contact-type power supply method cannot be used in an explosion-proof area because there is a risk of sparks occurring at the contact portion. Further, since metal powder is generated when the contact portion is worn, there is a problem that foreign matters such as the metal powder cannot be used in a clean room such as a semiconductor manufacturing factory which causes impurities to be mixed.
[0004]
On the other hand, the non-contact type power supply line system is used in a clean room because there is no contact portion and dust is not generated and power can be supplied constantly.
As shown in FIG. 3, this non-contact type power feeding structure has a pair of power supply lines 5, 5 laid through a support member 2 along a rail serving as a track. A substantially E-shaped core 3 is provided so as to surround the power supply lines 5, 5, the core 3 is fixed to the conveyance carriage side, and a pickup coil 4 is wound around the core 3 to form a power reception unit 9. When an alternating current flows through 5 and 5, an electric current is generated in the pickup coil 4, and power is supplied to the motor or the like of the transport carriage.
[0005]
[Problems to be solved by the invention]
When this electric power is supplied, an alternating current flows through the feeder lines 5 and 5 to generate a magnetic flux as shown by arrows around the core 3 and a structure such as a rail on the side supporting the feeder lines 5 and 5. When the body 6 is made of a conductor such as a metal, an eddy current is generated when the magnetic flux passes through the structure 6, resulting in a loss. Particularly in the case of a ferromagnetic material such as iron, the loss is very large and the power feeding characteristics are remarkably deteriorated.
[0006]
In order to prevent this eddy current from being generated, conventionally, a magnetic material generated by providing a high-resistance magnetic material 7 on the surface of the structural member facing the power receiving unit 9 and causing a current to flow through the feeder lines 5 and 5 is The magnetic flux generated by the current flowing through the closed magnetic path formed by the core 3 of the power receiving unit 9 and the high-resistance magnetic material 7 does not penetrate into the high-resistance magnetic material 7 due to the skin effect. It was like that.
[0007]
Since the high-resistance magnetic material 7 has a large electric resistance, it is difficult for current to flow. Even if a change in magnetic flux occurs in the high-resistance magnetic material 7, eddy current is difficult to flow, loss is reduced, and magnetic flux enters the structure 6. prevent. As a result, the magnetic flux can be shielded and no eddy current is generated in the structure 6.
[0008]
However, since the high-resistance magnetic material 7 is attached to the surface of the structure 6 on the core side, there is a problem that the gap between the core 3 and the structure 6 is large and the power supply efficiency is deteriorated.
Therefore, the present invention provides a tracked carriage system including a feeder line holder with improved feeding characteristics.
[0009]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. In other words, in claim 1, there is provided a tracked carriage provided with a power receiving core having an opening recess, a rail constituting the track of the tracked carriage, and a feed line holding portion for arranging a feed line at a predetermined position of the core recess. And a feeder line holder disposed along the rail, wherein the feeder line holder is configured to supply power to the tracked carriage without contact via the power receiving core from the feeder line. In addition to being arranged above, a shelf is provided in the middle of the feeder line with a gap between the rail and the rail, and a magnetic body is provided on the shelf, and the top surface of the magnetic body is positioned near the opening end of the core. And arranged along the longitudinal direction of the feeder line .
[0010]
According to a second aspect of the present invention, the feeder holding portion is located on the back side of the recess.
[0011]
According to a third aspect of the present invention, the power receiving core is formed of an E-shaped core having two recesses, and the power supply line holder has a pair of parallel legs to arrange the power supply line holding part in the two recesses. In addition, the magnetic body is attached so as to lie horizontally between the legs.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a non-contact power feeding system according to an embodiment of the present invention will be described with reference to the drawings. A non-contact power supply method using a feeder line will be described with reference to FIGS.
[0013]
FIG. 1 is a diagram schematically showing a tracked bogie system in which electric power is supplied from a feeder line in a contactless manner. In FIG. 1, the track 12 is laid on the moving path of the transport carriage 13, and the feeder line 5 in which a conductive wire such as a copper wire is covered with an insulating material is disposed along the track 12, and the track 12 is disposed on the side of the track 12. A plurality of stations 10, 10 are arranged, and the transport carriage 13 moves between the stations 10, 10 so that articles can be transported from one station 10 to the other station 10.
[0014]
An AC power supply 11 is provided at one end of the feeder lines 5 and 5 so that power can be supplied at a predetermined frequency. The transport carriage 13 is installed so as to reciprocate on the track 12 and to circulate when the track 12 is formed in an annular shape, and is driven by driving a motor with a high-frequency current supplied from the AC power supply 11. Like to do. The transport carriage 13 has a power receiving unit 9 for obtaining electric power from the power supply line 5, and moves on the track 12 using electric power extracted by the power receiving unit 9.
[0015]
FIG. 2 is a cross-sectional view of the power receiving unit 9 of the tracked carriage system of the present invention, and the power supply method and the configuration of the power receiving unit 9 and the power supply line 5 will be described.
A rail 20 constituting the track 12 is fixed on a floor 21, and wheels 23 of a transport carriage 13 travel on the rail 20 by driving of a motor.
[0016]
On the rail 20, a substantially U-shaped feeder line holder 24 is fixed in the longitudinal direction along the rail 20, and a C-shaped feeder line holding part 24 a. 24a is formed, and feed lines 5 and 5 are installed on the feed line holding portions 24a and 24a as a pair of forward and return paths.
[0017]
A power receiving unit 9 is disposed so as to surround the power supply line 5. A bracket 26 is fixed to the transport carriage 13 in the power receiving unit 9, and a guide roller (not shown) is attached to the bracket 26. It arrange | positions so that it may contact | abut to the rail 20 or the feeder holder 24, and when both drive | work along the rail 20, it can drive | work, maintaining a predetermined space | interval, without mutually interfering.
A ferrite core 3 having a substantially E-shaped cross section is fixed in the bracket 26 of the power receiving unit 9, and a pickup coil 4 is wound around a protruding portion 3 a at the center of the core 3.
[0018]
The core 3 is a view of the space on the opposite side to the opening side, that is, on the closed side (back side), in the two spaces (concave portions) formed between the protruding portions 3b and 3b on both sides and the central protruding portion 3a therebetween. The feed line holding portions 24a and 24a are positioned substantially in the center of the left and right sides, and the feed lines 5 and 5 are accommodated one by one. The pickup coil 4 receives an alternating magnetic field generated by flowing a high-frequency current through the feeder lines 5. Then, using the electromagnetic induction phenomenon, the power receiving unit 9 extracts power from the voltage generated in the pickup coil 4 due to the change in the magnetic flux. In this way, electric power is supplied from the power supply line 5 to the power receiving unit 9 in a non-contact manner, and the driving motor is driven or electric power is supplied to the control device.
[0019]
And in this invention, shelf part 24b * 24b is formed in the up-and-down middle part inside the said feeder holder 24, facing substantially horizontal direction. However, the shelf 24b may be a single plate connecting both sides, but it is preferable to separate the shelf 24b in order to enhance the cooling effect described later. A mark is provided on the upper surface of the shelf 24 so that the transport carriage 3 can be stopped at a predetermined position.
[0020]
The magnetic body 30 is fixed on the shelf portions 24b and 24b. However, it is also possible to adopt a configuration in which the magnetic body 30 is directly placed inside the feeder line holder 24. The magnetic body 30 is extended along with the feeder holder in the longitudinal direction so that the magnetic body 30 is positioned near the lower end of the core 3. That is, the upper surface of the magnetic body 30 is arranged as close to the lower side of the opening end of the core 3 as possible. The magnetic body 30 is provided in accordance with the orientation and shape of the structure such as the rail 20, and is arranged so that the core gap between the projecting portions 3a and 3b of the core 3 is as narrow as possible, while the transport cart 13 travels. It is important to provide the core 3 so as not to hinder the movement of the core 3 associated with. In particular, the feeder holder 24 is provided between the projecting portions 3a and 3b of the core 3 and the structure such as the rail 20 at a position close to the projecting portions 3a and 3b as long as the movement of the core 3 is not hindered. preferable.
[0021]
The magnetic body 30 is particularly preferably a high magnetic permeability material, and the material is preferably ferrite, but may be a low carbon steel plate or a silicon steel plate. Further, it is possible to configure only the vicinity of the stop position of the transport carriage 13 where there is a possibility of heat generation with ferrite.
[0022]
Further, leg portions (leg portions) 30 a, 30 a... Are provided on the lower surface of the magnetic body 30. The foot 30a adjusts and lifts the magnetic body 30 to a predetermined height between the shelf 24b and the lower end of the core 3, and the back side of the magnetic body 30 and a structure such as the rail 20 A space is formed between them. The reason why the foot portion 30a is formed in a fin shape is to reinforce the magnetic body and to release heat when the carriage is stopped for a long time in a power receiving state to suppress heat generation.
[0023]
In such a configuration, if the direction of the high-frequency current flowing through the feeder line 5 (referred to as the feeder lines 5a and 5b) is in a state as shown in FIG. 2 at a certain moment, the direction of the magnetic flux generated by the current Is in the direction indicated by the arrow. That is, a magnetic flux is formed that circulates around the feeder lines 5a and 5b in opposite directions. At this time, for example, the magnetic flux generated by the power supply line 25a passes through the inside of the core 3, exits from the distal end portion of the central projecting portion 3a, and reaches the distal end portion of the projecting portion 3b at the end portion to make one round. To do.
[0024]
A part of the magnetic flux emitted from the tip of the protrusion 3 a passes through the magnetic body 30. That is, since the magnetic body 30 is made of a high magnetic permeability material, the magnetic flux easily passes through, and since the gap between the tip portion of the protrusion 3a is small, more magnetic flux tends to pass through the magnetic body 30. For this reason, even if there is a structural member such as a rail 20 made of metal or the like facing the core 3, the magnetic flux does not reach the rail 20 or the like, thereby reducing eddy current loss and suppressing heat generation of the rail 20 or the like. It can be done. In particular, in this embodiment, since a space is formed between the magnetic body 30 and the rail 20, it is possible to prevent the rail 20 from generating heat more reliably.
[0025]
Further, as the magnetic flux increases, a current proportional to the magnetic flux flows through the pickup coil 4, and the power that can be supplied to the transport carriage 13 can also be increased. In particular, when the magnetic body 30 is made of ferrite, the loss is reduced, current does not easily flow, generation of eddy currents can be more reliably suppressed, power feeding characteristics can be further improved, and heat generated by the rails 20 and the like can be generated. It can be suppressed more.
[0026]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained. That is, as described in claim 1, there is provided a tracked carriage having a power receiving core having an opening recess, a rail constituting the track of the tracked carriage, and a feeder holding part for arranging a feeder at a predetermined position of the core recess. And a feeder line holder disposed along the rail, wherein the feeder line holder is configured to supply power to the tracked carriage without contact via the power receiving core from the feeder line. In addition to being arranged above, a shelf is provided in the middle of the feeder line with a gap between the rail and the rail, and a magnetic body is provided on the shelf, and the top surface of the magnetic body is positioned near the opening end of the core. And along the longitudinal direction of the feeder line , the core gap is reduced and the power that can be picked up is increased. For this reason, the power feeding efficiency could be improved. In addition, since a space is formed between the magnetic body and the rail, the magnetic flux does not reach the rail, and heat generation of the rail can be prevented.
[0027]
In addition, since the feeder line holding portion is positioned on the back side of the concave portion as in the second aspect, the power feeding efficiency is higher than the center of the concave portion.
[0028]
Moreover, since the magnetic body is attached so as to be horizontally mounted on the leg portion of the feeder holder as in the third aspect, the distance between the core and the magnetic body can be made closer. Furthermore, as a result, a space is formed on the back surface of the magnetic body, so that an effect of cooling the heat generated when the carriage is stopped for a long time in a power receiving state can be expected.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a tracked bogie system that supplies power from a power supply line in a contactless manner.
FIG. 2 is a cross-sectional view of a power receiving unit 9 of the tracked cart system of the present invention.
FIG. 3 is a cross-sectional view of a power receiving unit 9 of a conventional tracked carriage system.
[Explanation of symbols]
3 Core 5 Feed line 13 Bogie 24 Feed line holder 24a Feed line holding part 30 Magnetic body

Claims (3)

A track guided vehicle having a power receiving core having an opening recess, and the rail constituting the trajectory of the track guided vehicle, are arranged along the closed to the rail feed line holding portion to place the feed line at a predetermined position of the core recess A tracked carriage system comprising a feeder line holder and configured to feed power from the feeder line to the tracked carriage via a power receiving core in a contactless manner;
The feeder holder is located on the rail,
A shelf is provided in the middle of the upper and lower portions of the feeder holder with a gap between the rails, and the magnetic body is disposed on the shelf so that the upper surface of the magnetic body is positioned near the opening end of the core. , Arranged along the longitudinal direction of the feeder line,
A tracked cart system characterized by that.   The tracked carriage system according to claim 1, wherein the feeder holding portion is located on the back side of the recess.   The power receiving core is composed of an E-shaped core having two recesses, and the power supply holder includes a pair of parallel legs for disposing the power supply holding part in the two recesses, and the magnetic body is formed of the legs. The tracked carriage system according to claim 1 or 2, wherein the carriage is mounted so as to be horizontally placed between the parts.

Images