Electricity: transmission to vehicles – Magnetic induction
Patent
1996-05-28
1998-01-20
Le, Mark T.
Electricity: transmission to vehicles
Magnetic induction
B60L 500
Patent
active
057092915
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a device for contactlessly supplying power to a moving body, such as a pallet, carrying a device to receive power and being transported in a predetermined transport passage.
BACKGROUND OF THE INVENTION
This type of known device comprises a current collecting plate disposed on the lower surface of a pallet transported by a conveyor, such as a chain conveyor, a swingable current collector or power supplying roller disposed on the conveyor, said current collector or power supplying roller being connected to a power source wiring and contacted with the current collecting plate on the pallet. This contact forms a power supplying passage to the pallet to effect power supply to a device to receive power placed on the pallet.
However, in such known power supplying device, the current collecting plate on the pallet and the current collector on the conveyor rub each other and thereby wear, thus making maintenance indispensable. Another problem is that dust is produced during wearing. Further, since the current collector or power supplying roller on the conveyor is left exposed, there is a danger of being struck by electricity. Further, sparks are produced in the sliding parts, a fact which means that the device cannot be used in areas where explosion should be prevented.
Accordingly, Japanese Patent Application Disclosure No. 63-73802 proposes a contactless power supplying device comprising a power supplying line laid along a transport passage for a moving stand and a power transmission section disposed on one side of the moving stand for magnetic coupling with said power supplying wire.
In such power supply based on magnetic coupling, however, Unless the distance between the power supplying wire and the power transmission section is kept constant, power supplying efficiency lowers, making it impossible to attain a stabilized power supply.
Accordingly, Japanese Utility Model Application Disclosure No. 1-180101 proposes an arrangement wherein a mechanism for keeping constant the distance between the power supplying line and the power transmission section is installed in the power transmission section.
However, such mechanical mechanism complicates the device, resulting in an increased cost and need for maintenance.
SUMMARY OF THE INVENTION
The present invention has solved the above problems. One object of the invention is to provide a contactless power supplying device which eliminates the need for maintenance and is to contactlessly and efficiently supplies power to a moving body such as a pallet being transported.
To achieve this object, the device for contactlessly supplying power to a moving body being transported in a predetermined transport passage and having mounted thereon a device to receive power while supplying power to the last-mentioned device, comprises an induction wire which is laid along said transport passage and through which a high frequency sine wave current is passed, a coil installed in said moving body and subjected to the magnetic flux from said induction wire to produce an electromotive force, a capacitor installed in said moving body and cooperating with said coil to form a resonance circuit adapted to resonate at the frequency of the current flowing through said induction wire, and a power source circuit installed in said moving body and connected to said resonance circuit to supply power to said device to receive power.
According to such arrangement, an ac current is passed through the induction wire and the secondary side of the coil forms a resonance circuit, and hence a high voltage is produced in the secondary side; therefore, even if the distance between the induction wire and the coil varies or the frequency in the induction wire more or less fluctuates or the resonance frequency for the secondary side more or less fluctuates, a secondary side voltage having not less than a predetermined value is generated, and hence a high power can be contactlessly supplied stably to a device to to receive power. Further, the secondary sid
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Imanaka Tomomi
Iwama Michio
Nishino Shuzo
Daifuku Co. Ltd.
Le Mark T.
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