Power transmission device

• US 10,305,330 B2
• Filed: 03/28/2017
• Issued: 05/28/2019
• Est. Priority Date: 03/30/2016
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Hanabusa, Kazuyoshi, Kobayashi, Masayuki, Kamono, Takeshi
• Primary Examiner(s): Barnie, Rexford N
• Assistant Examiner(s): Ly, Xuan
• Application Number:
  US15/471,345
• Publication Number:
  US 20170288464A1
• Time in Patent Office: 791 Days
• Field of Search: 307104
• CPC Class Codes: H01F 27/2885 with shields or electrodes shields or electrodes for pancake coils H01F27/2871; construction of electric or magnetic shields or screens H01F27/36
• 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
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A power transmission device, which is used for a contactless power transmission to a movable body moving on a travelling surface in a power transmission direction parallel to the travelling surface, including a power transmission coil and a shielding plate, wherein, the power transmission coil is installed so that a coil surface is approximately vertical to the travelling surface, and at least a part of the shielding plate is disposed inside the region on the travelling surface sandwiched between a plane surface defined by a coil surface of the power transmission coil and a plane surface defined by a coil surface of a power receiving coil mounted on the movable body.

Claims

1. A power transmission device, which is used for a contactless power transmission to a movable body moving on a travelling surface in a power transmission direction parallel to the travelling surface, comprising a power transmission coil and a shielding plate, wherein,

the power transmission coil is installed so that a coil surface is approximately vertical to the travelling surface,

at least a part of the shielding plate is disposed inside the region on the travelling surface sandwiched between a plane surface defined by a coil surface of the power transmission coil and a plane surface defined by a coil surface of a power receiving coil mounted on the movable body,

the power transmission coil is disposed so that an installation height that is a distance from a coil outer edge to the travelling surface is shorter than a length of the coil outer shape in a direction approximately vertical to the travelling surface, and

a length from the plane surface defined by the coil surface of the power transmission coil to an end portion of the power receiving coil side of the shielding plate is set to be longer than the installation height.

2. The power transmission device of claim 1, wherein,

the shielding plate is disposed to improve the power transmission efficiency from the power transmission coil to the power receiving coil.

3. The power transmission device of claim 1, wherein,

an upper surface of the shielding plate is disposed to be approximately in the same plane as the travelling surface.

4. The power transmission device of claim 2, wherein,

an upper surface of the shielding plate is disposed to be approximately in the same plane as the travelling surface.