JP2020099158A - Transport system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer system capable of reducing leakage of an electric field and a magnetic field. A transfer system includes a power transmission electrode having a predetermined length, a high frequency generator that supplies electric power to the power transmission electrode by applying a predetermined voltage at a predetermined frequency, and the high frequency generator. And a connecting wire 37 that connects the power transmitting electrode to the power receiving electrode, a power receiving electrode 20 configured to be electrically coupled to the power transmitting electrode, and movable by being driven by electric power supplied to the power receiving electrode. The moving position of the moving body is high, and the connecting position where the connecting line is connected to the power transmitting electrode faces the power receiving electrode of the moving body when the moving body stops. Exists in the area where [Selection diagram] Fig. 7

Description

The present invention relates to a transportation system.

There has been proposed a carrier system that wirelessly supplies electric power to a moving body such as a carrier vehicle by using electric field coupling.

JP, 2014-168370, A JP, 2008-68079, A

In a power feeding device that wirelessly supplies power to a moving body such as a transport vehicle using electric field coupling, electric fields and magnetic fields may leak from the power feeding electrode and the power transmitting electrode. Due to the leakage of the electric field and the magnetic field, there is a concern that the electric devices and the human body existing around the power supply device may be adversely affected.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a transfer system capable of reducing leakage of an electric field and a magnetic field.

The transport system according to claim 1, wherein the power transmission electrode has a predetermined length, a high frequency generator that supplies power to the power transmission electrode by applying a predetermined voltage at a predetermined frequency, and the high frequency generator. And a power receiving electrode configured to be electrically coupled to the power transmitting electrode, and configured to be movable by being driven by electric power supplied to the power receiving electrode. A moving body, and the connection position where the connection line connects to the power transmitting electrode is in a region facing the power receiving electrode of the moving body when the moving body frequently stops and when the moving body stops. Exists in.

With this configuration, it is possible to reduce the leakage of the electric field and the magnetic field from the power transmission electrode in the region where the moving body does not stop. Therefore, it is possible to suppress heat generation of peripheral devices due to leakage of electric fields and magnetic fields, and it is possible to reduce power loss in the transport system.

Bird's-eye view showing a schematic configuration of a transport system according to an embodiment The figure which shows schematic structure of a mobile body and a power transmission electrode. A perspective view showing a schematic configuration of a moving body and a power transmission electrode. Block diagram showing a schematic configuration of a moving body Block diagram showing a schematic configuration of a power transmission device Schematic diagram showing the relationship between the moving body position, the connection position of the connection line, and the strength of the electric field and magnetic field Schematic diagram showing the connection position of the connection line to the power transmission electrode

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a transfer system to which the power supply device according to the embodiment is applied will be described.
As shown in FIGS. 1 to 5, the transport system 1 includes a moving body 10 and a power transmission device 30. The power transmission device 30 includes a power transmission electrode 38 and a high frequency generator 31. As shown in FIG. 1, the power transmission electrode 38 is provided in a factory 42 or a warehouse that uses the transfer system 1.

The moving body 10 includes a power receiving electrode 20, a rectifying circuit unit 22, a control unit 24, a motor 26 that drives the wheels 12, and a charger 28. The rectifying circuit unit 22 rectifies the high frequency received by the power receiving electrode 20 into direct current. The rectifier circuit unit 22 may include a DC-DC converter. The charger 28 stores the electric power rectified by the rectifying circuit unit 22. The charger 28 is composed of a secondary battery such as a lithium ion battery.

The control unit 24 controls the charging of the charger 28 and also controls the driving force generated by the motor 26. The motor 26 rotationally drives the wheel 12 under the control of the control unit 24. The moving body 10 moves by the driving force generated by the motor 26. The moving body 10 is configured to be movable along a running path (not shown) installed in the factory 42, and functions as, for example, a transport vehicle that transports luggage in the factory 42.

The power transmission electrode 38 is provided along a traveling path in the factory 42 in which the mobile body 10 travels. The power receiving electrode 20 of the moving body 10 constitutes a capacitor by facing the power transmitting electrode 38, and receives power from the power transmitting electrode 38 as a power source for driving. The moving body 10 stores the power received by the power receiving electrode 20 in the charger 28 after rectifying the power in the rectifying circuit unit 22.

As shown in FIG. 1, the power transmission electrode 38 is installed in a wireless power supply station 40 for supplying electric power to the moving body 10. The power transmission electrodes 38 forming the power transmission device 30 are provided in a pair of parallel rails. The power transmission electrode 38 is not limited to a linear shape, but may be a curved shape or a bent shape according to the structure of the factory 42. The power transmission electrode 38 is made of a conductive material such as aluminum, copper, or iron, and has a plate shape.

As shown in FIG. 5 and the like, the power transmission device 30 includes a high frequency generator 31 and a power transmission electrode 38. The high frequency generator 31 is connected to the power transmission electrode 38 via the connection line 37 at connection positions A, B, and C shown in FIGS. The high frequency generator 31 includes a power supply 32, a high frequency generator 34, and a matching device 36.

The high frequency generation unit 34 is configured by, for example, an E-class inverter that generates a high frequency having a predetermined frequency and a predetermined voltage, and transmits the generated power having the predetermined frequency and the predetermined voltage via the matching unit 36. It is applied to the electrode 38. The high frequency generation unit 34 is composed of, for example, an oscillation element such as a crystal and a switching element of a semiconductor, and is not limited to a class E inverter, and may have any configuration as long as it can generate a high frequency.

The power transmission electrode 38 is composed of, for example, an antenna, and functions as an oscillating unit that transmits the high frequency generated by the high frequency generating unit 34. The matching unit 36 is provided between the high frequency generation unit 34 and the power transmission electrode 38, and has a function of matching the impedance between the pair of power transmission electrodes 38.

The total length of the power transmission electrode 38 is set in advance in accordance with the stop frequency and the number of stopped vehicles of the mobile body 10 at the wireless power supply station 40, and the power that can be supplied by the power transmission device 30. For example, the power transmission electrode 38 has a length that can face the power reception electrodes 20 of the three mobile bodies 10 when the three mobile bodies 10 frequently stop at the wireless power supply station 40.

A pair of power receiving electrodes 20 is provided on the moving body 10 corresponding to the pair of power transmitting electrodes 38. The power transmitting electrode 38 and the power receiving electrode 20 are configured so as to be opposed to each other in a non-contact manner while forming a predetermined space therebetween and being separated from each other. Like the power transmission electrode 38, the power reception electrode 20 is made of a conductive material such as aluminum, copper, or iron.

In this way, the power transmitting electrode 38 and the power receiving electrode 20 are electrically coupled with each other with a predetermined distance, so that air serving as a dielectric is filled between them. As a result, an electrostatic capacity is secured between the power transmitting electrode 38 and the power receiving electrode 20. With this configuration, the power receiving electrode 20 is supplied with electric power by electric field coupling with the power transmitting electrode 38 when facing the power transmitting electrode 38.

Next, the relationship between the position of the moving body 10, that is, the position of the power receiving electrode 20, the position of connection to the power transmitting electrode 38, and the strength of the electric field and the magnetic field in the power transmitting electrode 38 will be described with reference to FIG. FIG. 6 is a diagram schematically showing an experimental result regarding the relationship between the position of the moving body 10, the connection position of the connection line, and the strength of the electric field and the magnetic field. In this case, the greater the strength of the electric field and the magnetic field, the greater the leakage of the electric field and the magnetic field (hereinafter referred to as the leakage electromagnetic field).

According to FIG. 6A, the stop position of the moving body 10 and the connecting position A are separated from each other in the left-right direction in the drawing to form an area E between the moving body 10 and the connecting position A, and the moving area is moved in this area E. It can be seen that when the body 10 is not stopped, the strength of the electric field and the magnetic field in the region E is high, and the leakage electromagnetic field from the power transmission electrode 38 is large. Further, in the region F on the side opposite to the connection position A with respect to the moving body 10, that is, on the right side, the magnetic field is greatly reduced and the electric field is also reduced as compared with the region E. From this, it can be seen that in the region F, the magnetic field leakage is greatly reduced and the electric field leakage is also reduced.

On the other hand, according to FIG. 6B, in the case where the moving body 10 is located at the left end of the power transmitting electrode 38 and the connection position A is present in the area facing the power receiving electrode 20 of the moving body 10, the following situation occurs. Becomes That is, in the region F on the side opposite to the connection position A with respect to the moving body 10, that is, on the right side, the magnetic field is greatly reduced and the electric field is also reduced as compared with the region E. Therefore, it can be seen that in the region F, the magnetic field leakage is greatly reduced and the electric field leakage is also reduced. In this case, there is no area E between the moving body 10 and the connection position A, where the moving body 10 is not stopped.

From the above, when the moving body 10 is not stopped in the area E formed by separating the stop position of the moving body 10 from the connection position A, the strength of the electric field and the magnetic field is large in the area E. It can be seen that the leakage electromagnetic field is large in the region.

Therefore, the transport system 1 according to the embodiment employs the following configuration.
FIG. 7 shows a connection position of the connection line 37 that supplies electric power from the power transmission device 30 to the mobile body 10 to the power transmission electrode 38 in the transport system 1 according to the embodiment. The stop positions of the moving bodies 10a, 10b, and 10c in FIGS. 7A, 7B, and 7C exemplify the positions at which the moving body 10 of the transport system 1 has a high stop frequency. The vehicle stop position and the number of vehicle stops of the moving body 10 with a high vehicle stop frequency are specified in advance by, for example, performing a test operation of the transport system 1 or performing a simulation in advance. The wireless power feeding station 40 is installed at a position where the parking frequency is high. The length of the power transmission electrode 38 installed in the wireless power feeding station 40 is set in consideration of the number of moving bodies 10 that frequently stop and the power supply capacity of the transport system 1.

FIG. 7A exemplifies a situation in which one mobile body 10 a is stopped at the left end of the power transmission electrode 38 when the left end of the power transmission electrode 38 in the drawing is at a position where the vehicle system 1 is frequently stopped. doing. On the right side of the moving body 10a, a region J where the moving body 10 is not stopped exists adjacently. In this case, the connection position A of the connection line 37 to the power transmission electrode 38 is in the region P facing the power reception electrode 20 and on the left end portion of the power transmission electrode 38, that is, on the opposite side of the region J where the moving body 10 is not stopped. Is located at the end of the power transmission electrode 38.

In this case, the connection position A may be any position within the region P facing the power receiving electrode 20. In this configuration, the connection position A exists in the region P of the moving body 10 facing the power receiving electrode 20, so that the leakage electromagnetic field in the region J adjacent to the region P without the moving body 10 can be reduced. ..

In FIG. 7B, when the positions of the two leftmost power transmission electrodes 38 in the figure are positions where the moving body 10 frequently stops, the two moving bodies 10 a and 10 b are located at the left end of the power transmission electrode 38. It illustrates the situation where the vehicle is stopped. On the right side of the moving bodies 10a and 10b, there is a region K adjacent to the moving body 10 where the moving body 10 is not stopped. In this case, the connection position B of the connection line 37 to the power transmission electrode 38 is located near the center in the region Q of the moving body 10a and the moving body 10b facing the power receiving electrode 20. The connection position B may be any position within the area Q.

In this configuration, since the connection position B exists in the area Q facing the power receiving electrode 20 of the moving bodies 10a and 10b, the leakage electromagnetic field in the area K adjacent to the area P without the moving bodies 10a and 10b is reduced. can do.

FIG. 7C exemplifies a situation in which one moving body 10 c stops at the right end of the power transmission electrode 38 when the right end in the figure of the power transmission electrode 38 is at a position where the moving body 10 frequently stops. ing. On the left side of the moving body 10c, an area L in which the moving body 10 is not stopped exists adjacently. In this case, the connection position C of the connection line 37 to the power transmission electrode 38 is in the region R facing the power reception electrode 20 and on the right end portion of the power transmission electrode 38, that is, on the opposite side of the region L where the moving body 10 is not stopped. Is located at the end of the power transmission electrode 38. In this case, the connection position C may be any position in the region R facing the power receiving electrode 20.

In this configuration, since the connection position C exists in the region R of the moving body 10 facing the power receiving electrode 20, the leakage electromagnetic field in the region L adjacent to the region R without the moving body 10 can be reduced. it can.

The transport system 1 according to the embodiment has the following effects.
According to the transport system 1 of the embodiment, the connection positions A, B, and C at which the connection line 37 for transmitting the high-frequency power generated by the high-frequency generator 31 of the power transmission device 30 connects to the power transmission electrode 38 are 1. It is configured to be located at any position in regions P, Q, and R facing the power receiving electrode 20 of the platform or the plurality of moving bodies 10.

With this configuration, since there is no region (region E in FIG. 6) in which the moving body 10 is not stopped and which is an area formed by separating the stop position and the connection position of the moving body 10, The leakage electromagnetic field in the entire electrode 38 can be reduced. Further, it is possible to reduce the leakage electromagnetic field from the power transmitting electrodes 38 in the regions J, K, L adjacent to the regions P, Q, R facing the power receiving electrode 20 and in which the moving body 10 does not stop. Therefore, it is possible to suppress heat generation and the like of peripheral devices due to the leakage electromagnetic field, and reduce power loss in the transport system 1. In this case, the region where the moving body 10 is not stopped (region E) is configured not to exist, but the region where the moving body 10 is not stopped may be configured to be as narrow as possible.

Although the present disclosure has been described with reference to examples, it is understood that the present disclosure is not limited to such examples and structures. The present disclosure also includes various modifications and modifications within an equivalent range. In addition, various combinations and forms, and other combinations and forms including only one element, more, or less than them are also within the scope and spirit of the present disclosure.

DESCRIPTION OF SYMBOLS 1... Carrier device, 10... Moving body, 20... Power receiving electrode, 30... Power transmission device, 31... High frequency generator, 37... Connection line, 38... Power transmission electrode

Claims (3)

A power transmission electrode (38) having a predetermined length,
A high frequency generator (31) for supplying electric power by applying a predetermined voltage at a predetermined frequency to the power transmission electrode;
A connection wire (37) connecting the high-frequency generator and the power transmission electrode,
A power receiving electrode (20) configured to be electrically coupled to the power transmitting electrode,
A movable body (10) configured to be movable by being driven by electric power supplied to the power receiving electrode,
The connection position (A, B, C) where the connection line connects to the power transmission electrode is in a region facing the power reception electrode of the mobile body when the mobile body frequently stops and the mobile body stops. Existing transport system. The transfer system according to claim 1, wherein when the power receiving electrode faces the power transmitting electrode, electric power is supplied from the power transmitting electrode by electric field coupling with the power transmitting electrode. The transport system according to claim 1 or 2, wherein the length of the power transmission electrode is set in advance according to the stop frequency and the number of stopped vehicles of the moving body and the power that can be supplied by the power transmission device.

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