Wireless power transmission apparatus and direct drive type system including the apparatus

Patent metadata

Field	Value
Publication number	US-9601265-B2
Application number	US-201314030417-A
Country	US
Kind code	B2
Filing date	Sep 18, 2013
Priority date	Sep 26, 2012
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

A direct drive type system such as a direct drive type robot is provided. This system includes a rail member, a movable member guided by the rail member and movable along the rail member, and an electric motor to drive the movable member. The system includes a transmission coil and a reception coil. The transmission coil has plural transmission coil segments which are planar coils and arranged on and along the rail member. High-frequency power is supplied to the transmission coil from a power source. The reception coil is arranged on the movable member to be opposed to the transmission coil and configured to an area faced with each of the transmission coil segments, wherein the area is smaller than that of each transmission coil segment. The reception coil receives power from the transmission coil without contact by a magnetic resonance. The received power is supplied to the motor.

First claim

What is claimed is:

1. A direct drive type of system, comprising:
a rail member;
a movable member comprising a moving member held by the rail member and movable along the rail member and an electric motor driven by the moving member;
a power transmission coil comprising a plurality of power transmission coil segments each composed of a planar coil and cascade-arranged along the rail member with a coil-less region provided between two of the mutually adjacent transmission coil segments, wherein high-frequency current is supplied to the power transmission coil segments from a power source;
a power reception coil arranged in the movable member so as to be opposed to the power transmission coil via a gap, wherein the power reception coil is formed as a planar coil having an area opposed to each of the power transmission coil segments and the area of the power reception coil is smaller than an area of each of the power transmission segments, wherein power to be fed to the motor is non-contact transmitted from the power transmission coil to the power reception coil by a magnetic resonance phenomenon.

2. The direct drive type of system of claim 1 , wherein
the rail member comprises a transmission-side substrate on which the power transmission coil is formed and a holding member configured to be engaged with the moving member and movably to hold the moving member, and
the movable member comprises a reception-side substrate on which the power reception coil is formed.

3. The direct drive type of system of claim 2 , wherein
the transmission-side and reception-side substrates are tabular substrates,
the rail member and the movable member are formed on the tabular substrate,
the tabular substrate has two surfaces, the power transmission coil or the power reception coil being formed on one of the two surfaces, a tabular electrode member being arranged along the one of the two surfaces, the tabular substrate functioning as a dielectric material to form a capacitor therebetween.

4. The direct drive type of system of claim 3 , wherein the tabular electrode member is divided into a plurality of tabular electrode members.

5. The direct drive type of system of claim 2 , wherein
the reception-side substrate comprises
a frontal substrate located to be opposed to a front surface of the transmission-side substrate on which the power transmission coil is formed and configured movably along the rail member, and
a rear substrate located to be opposed to a rear surface of the transmission-side substrate which is positioned back-to-back to the front surface and configured movably along the rail member; and

the reception coil comprises
a frontal reception coil formed on a surface of the frontal substrate which is opposed to the transmission-side substrate, and

a rear reception coil formed on a surface of the rear substrate which is opposed to the transmission-side substrate.

6. The direct drive type of system of claim 5 , wherein the frontal and rear reception coils both are composed of planar coils and wound to produce a mirror-image relationship via the transmission-side substrate.

7. The direct drive type of system of claim 2 , wherein
the transmission-side substrate comprises
two end substrates respectively located at both end portions thereof, and
one or more intermediate substrates located between the two end substrates, the two end substrates and any of the intermediate substrates being configured to be engaged with each other to produce a single transmission-side substrate,

the transmission coil comprises
two end transmission coil portions formed on the two end substrates respectively and configured to function as two end portions of the transmission coil respectively, and
one or more intermediate transmission coil portions formed on the one or more intermediate substrates respectively and configured to electrically connect the two end transmission coil portions with each other, mutually engaging the two end substrates and the intermediate substrates allowing the two end transmission coil portions and the intermediate transmission coil portions to be connected electrically with each other so as to produce a single transmission coil segment.

8. The direct drive type of system of claim 7 , wherein the single transmission coil segment is electrically connected to a capacitor at a part the segment so as to adjust a resonance frequency of the single transmission coil segment.

9. The direct drive type of system of claim 2 , wherein each of the plurality of power transmission coil segments is formed by winding, one turn or plurality of turns, a conductor along an elongated winding pattern,
the power reception coil is formed by winding a conductor, one turn or plurality of turns, along a circular or square winding pattern,
each of the power transmission coil segments has a coil area defined as an inside area encircled by outermost turn of the wound turns of each of the power transmission coil segments, and
the power reception coil has a coil area opposed to the coil area of each of the coil areas of the power transmission coil segments and smaller than the inside area of the outermost turn of the respective power transmission coil segments.

10. The direct drive type of system of claim 9 , wherein
the transmission-side substrate is composed of a plurality of elongated rectangular transmission-side substrates on which the plurality of power transmission coil segments are formed respectively,
the plurality of transmission-side substrates are cascade-connected along a moving direction of the movable member, and
the plurality of power transmission coil segments are connected parallel with the power source.

11. A wireless power transmission apparatus for a direct drive type of system comprising:
a rail member;
a movable member comprising a moving member held by the rail member and movable along the rail member and an electric motor driven by the moving member;
a power transmission coil comprising a plurality of power transmission coil segments each composed of a planar coil and cascade-arranged along the rail member with a coil-less region provided between two of the mutually adjacent transmission coil segments, wherein high-frequency current is supplied to the power transmission coil segments from a power source; and
a power reception coil arranged in the movable member so as to be opposed to the Power transmission coil via a gap, wherein the power reception coil is formed as a planar coil having an area opposed to each of the power transmission coil segments and the area of the power reception coil is smaller than an area of each of the power transmission segments, wherein power to be fed to the motor is non-contact transmitted from the power transmission coil to the power reception coil by a magnetic resonance phenomenon, and
a tabular substrate;
a tabular coil member arranged on one of two surfaces of the substrate, the one surface being a front surface; and
a tabular electrode member arranged on the other of the two surfaces of the substrate, the other surface being a rear surface, the electrode member layering the substrate with the coil member to produce a capacitor.

12. A wireless power transmission apparatus for a direct drive type of system, comprising:
a rail member;
a movable member comprising a moving member held by the rail member and movable along the rail member and an electric motor driven by the moving member;
a power transmission coil comprising a plurality of power transmission coil segments each composed of a planar coil and cascade-arranged along the rail member with a coil-less region provided between two of the mutually adjacent transmis

Assignees

• Denso Wave Inc
• Denso Corp

Inventors

• Sugino Masayoshi
• Kondoh Hiroshi
• Takeda Shigeru
• Haseo Yasuyuki
• Hamasaki Keisuke

Classifications

• H01F38/14 Primary

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H01F27/2804

  Printed windings · CPC title