# US 11,309,125 B2 · Power transmission unit and power transmission coil

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- Number: US 11,309,125 B2
- Document ID: US11309125B2
- Status: Granted
- Kind: B2
- Application number: 15/984,987
- Filed: 2018-05-21
- Published: 2018-12-20
- Granted: 2022-04-19
- Earliest claimed: 2017-06-14
- Assignees: Yazaki Corporation
- Applicants: Yazaki Corporation
- Inventors: Ryohei Nishizaki; Takashi Shiroki; Takahiro Nakahara; Takayuki Ueda
- Web page: https://patentgrep.com/patent/US11309125B2

## CPC

- B60L 53/12: Inductive energy transfer
- H01F 27/02: Casings
- H01F 27/2823: {Wires (H01F27/2866 takes precedence)}
- H01F 27/2871: {Pancake coils}
- H01F 27/288: {Shielding}
- H01F 27/30: Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F 27/306: {Fastening or mounting coils or windings on core, casing or other support}
- H01F 27/36: Electric or magnetic shields or screens (movable for varying inductance H01F21/10)
- H01F 27/363: {made of electrically conductive material}
- H01F 38/14: Inductive couplings
- H01F 41/064: Winding non-flat conductive wires, e.g. rods, cables or cords
- H02J 50/005: {Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices}
- H02J 50/12: of the resonant type
- H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields
- H04B 5/79: for data transfer in combination with power transfer
- H01F 2027/2838: {using transposed wires}
- H02J 2105/37: exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV]
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 90/14: Plug-in electric vehicles
- Y02T 90/16: Information or communication technologies improving the operation of electric vehicles
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H04B: TRANSMISSION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A power transmission unit includes: a power transmission coil; a communication coupler that is formed in an annular shape about an axis X and arranged to surround the power transmission coil; and a shielding member that is formed in an annular shape about the axis X, and arranged between the power transmission coil and the communication coupler in an intersecting direction. The shielding member is arranged at a position along the intersecting direction to surround the power transmission coil, and shields magnetic force generated by the power transmission coil.

## Claims

### Claim 1

A power transmission unit comprising:
a power transmission coil that transmits electric power in a non-contact manner;
a communication part that is formed in an annular shape about an axis, arranged to surround the power transmission coil, and transmits and receives a signal; and
a shielding member that is formed in an annular shape about the axis, arranged between the power transmission coil and the communication part in an intersecting direction intersecting with the axis, and shields magnetic force generated by the power transmission coil, wherein
the shielding member is overlapped with the power transmission coil and both sides thereof in an axial direction along the axis direction are opened and co-planar with at least parts of the power transmission coil and the communication part when viewed from the intersecting direction.

### Claim 2 (depends on 1)

The power transmission unit according to claim 1, wherein
the shielding member includes a shield wall part that is arranged at a position along the intersecting direction to surround the power transmission coil so as to shield magnetic force generated by the power transmission coil, and
the shield wall part is formed such that a gap between wall surfaces opposed to each other in the intersecting direction is widened from one side toward the other side of the axial direction.

### Claim 3 (depends on 1)

The power transmission unit according to claim 1, further comprising:
a magnetic member that is arranged on the power transmission coil and includes a magnetic material;
the magnetic member is provided on an opening side of the shielding member opposite to a counterpart power transmission coil.

### Claim 4 (depends on 1)

The power transmission unit according to claim 1,
wherein the power transmission coil is configured to transmit the electric power in the axial direction,
wherein the intersecting direction is perpendicular to the axial direction, and
wherein the axial direction is perpendicular to a plane on which the shielding member is co-planar with at least the parts of the power transmission coil and the communication part.