US 5,709,291 AGranted

Device for contactless power supply to moving body

AssigneeDaifuku Co., Ltd.

InventorsShuzo Nishino, Michio Iwama, Tomomi Imanaka

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Abstract

A device for contactlessly supplying power to a moving body (2) such as a pallet being transported in a predetermined transport passage and carrying a device to be supplied with power while supplying power to the last-mentioned device. An induction wire (14) is laid along the transport passage (1) and a high frequency sine wave current is passed through the induction wire (14). The moving body (2) is provided with a coil (16) in which an electromotive force is produced by the action of the magnetic flux produced by the induction wire (14), a capacitor (31) cooperating with the coil (16) to form a resonance circuit adapted to resonate at the frequency of the current flowing through the induction wire (14), and a power switch circuit connected to the resonance circuit and supply power to the device to be supplied with power.

Claims10

Dependent claims

A transport system comprising:

a magnetic field shielding member having a C-shaped cross-section, which has a concave portion formed therein and is disposed along a transport passage guiding a moving body, said moving body being arranged in a non-guiding relationship with said shielding member;
an induction wire laid out in said concave portion of the magnetic field shielding member and a power source supplying said induction wire with a high frequency sine wave current;
a coil disposed in said moving body and caused to produce an electromotive force by a magnetic flux of said induction wire, said coil extending into said concave portion;
a capacitor disposed in said moving body and cooperating with said coil to form a resonance circuit which resonates at the frequency of a current flowing through said induction wire;
and
a power source circuit provided in said moving body and connected to said resonance circuit so as to supply power to a power receiving device provided on said moving body.

3 more elements

Dependencies are inferred from the claim text.