NON-CONTACT ELECTRICITY FEEDING SYSTEM AND RUNNING VEHICLE SYSTEM USING THIS, AND METHOD FOR REDUCING LEAKAGE MAGNETIC FIELD

• US 20080170350A1
• Filed: 01/11/2008
• Published: 07/17/2008
• Est. Priority Date: 01/12/2007
• Status: Abandoned Application

• Current Assignee: Murata Machinery Limited (Muratec)
• Original Assignee: Murata Machinery Limited (Muratec)
• Inventors: KOUMOTO, Homare
• Application Number:
  US11/972,795
• Publication Number:
  US 20080170350A1
• Time in Patent Office: Days
• US Class Current: 361/230
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 5/005 without mechanical contact between the collector and the power supply line
• CPC Class Codes: H01F 27/346 Preventing or reducing leakage fields using magnetic shields H01F27/36; using auxiliary windings H01F27/38
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10

Abstract

A feeding line is connected to an AC source so that electricity is picked up from the feeding line in a non-contact manner by a pickup coil provided on the side of a moving body. A compensating current from a compensating power source in phase or in reverse phase with respect to a current flowing in the feeding line is caused to flow in a compensating line arranged in the vicinity of the feeding line. A magnetic field from the compensating current reduces a leakage magnetic field from the feeding line.

Claims

1. A non-contact electricity feeding system having an AC source, a feeding line connected to the AC source, and a pickup coil that picks up electricity from the feeding line in a non-contact manner, and is provided on the side of a moving body, the system comprising:

a compensating power source in phase or in reverse phase with respect to a current flowing in the feeding line; and

a compensating line for reducing a leakage magnetic field from the feeding line by a compensating current from the compensating power source;

said compensating line being arranged in the vicinity of the feeding line.

2. The non-contact electricity feeding system according to claim 1, the compensating power source being a second pickup coil that is different from the pickup coil provided on the side of the moving body, and picking up electricity from the feeding line.

3. The non-contact electricity feeding system according to claim 2, the compensating line being a lengthy loop coil antenna having a plurality of turns, the lengthy direction of which being parallel to the feeding line.

4. A running vehicle system having the non-contact electricity feeding system according to claim 1, wherein said moving body is a running vehicle;

said running vehicle system further comprising;

an electricity feeding rail being provided with the feeding line for feeding electricity from the feeding line to a running vehicle;

wherein the compensating line is provided in the electricity feeding rail.

5. A method for reducing a leakage magnetic field from a non-contact electricity feeding system,

the non-contact electricity feeding system having an AC source, a feeding line connected to the AC source, and a pickup coil picking up electricity from the feeding line in a non-contact manner, provided on the side of a moving body,

the method comprising the step of:

causing a compensating current from a compensating power source in phase or in reverse phase with respect to a current flowing in the feeding line to flow through a compensating line arranged in the vicinity of the feeding line to thereby reduce a leakage magnetic field from the feeding line by a magnetic field from the compensating current.