Rotating body non-contact power-feeding device and torque sensor

• US 9,958,345 B2
• Filed: 01/16/2015
• Issued: 05/01/2018
• Est. Priority Date: 01/20/2014
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: Ichikawa, Katsuei, Soma, Atsuo, Miyajima, Kentarou, Ashida, Kisho, Ishii, Makoto, Sasaki, Motohiro, Iwaishi, Keisuke, Urushihata, Yuuya
• Primary Examiner(s): Patel, Harshad R
• Assistant Examiner(s): DAVIS-HOLLINGTON, OCTAVIA L
• Application Number:
  US15/109,453
• Publication Number:
  US 20160327444A1
• Time in Patent Office: 1,201 Days
• Field of Search: 73862325, 73862331-862338
• CPC Class Codes: B62M 6/50 characterised by detectors or sensors, or arrangement thereof
• CPC Class Codes: G01L 3/108 involving resistance strain gauges
• CPC Class Codes: H01F 38/18 Rotary transformers
• CPC Class Codes: H02J 2310/40 The network being an on-board power network, i.e. within a vehicle
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

A rotating body non-contact power-feeding device comprises: a power receiving-side substrate with a power receiving-side circuit component mounted thereat, which is fixed to a rotating shaft supported via a bearing and rotates as one with the rotating shaft; and a power transmitting-side substrate with a power transmitting-side circuit component mounted thereat, which is fixed to a holding unit holding the bearing so that a substrate surface thereof faces opposite a substrate surface of the power receiving-side substrate and is connected with a power source, wherein: a power transmitting-side coil is formed with a conductive pattern so as to achieve a flat-plane spiral pattern with a plurality of turns at a substrate surface facing opposite the power receiving-side substrate and the power transmitting-side circuit component is mounted at another substrate surface, at the power transmitting-side substrate that includes a substrate front surface and a substrate back surface, a power receiving-side coil is formed with a conductive pattern so as to achieve a flat-plane spiral pattern with at least one turn at a substrate surface facing opposite the power transmitting-side substrate and the power receiving-side circuit component is mounted at another substrate surface, at the power receiving-side substrate that includes a substrate front surface and a substrate back surface; and the power transmitting-side coil and the power receiving-side coil are magnetically coupled with each other so as to allow power to be contactlessly fed from the power transmitting-side substrate to the power receiving-side substrate.

Claims

1. A rotating body non-contact power-feeding device, comprising:

a power receiving-side substrate with a power receiving-side circuit component mounted thereat, which is fixed to a rotating shaft supported via a bearing and rotates as one with the rotating shaft; and

a power transmitting-side substrate with a power transmitting-side circuit component mounted thereat, which is fixed to a holding unit holding the bearing so that a substrate surface thereof faces opposite a substrate surface of the power receiving-side substrate and is connected with a power source, wherein;

a power transmitting-side coil is formed with a conductive pattern so as to achieve a flat-plane spiral pattern with a plurality of turns at a substrate surface facing opposite the power receiving-side substrate and the power transmitting-side circuit component is mounted at another substrate surface, at the power transmitting-side substrate that includes a substrate front surface and a substrate back surface,

a power receiving-side coil is formed with a conductive pattern so as to achieve a flat-plane spiral pattern with at least one turn at a substrate surface facing opposite the power transmitting-side substrate and the power receiving-side circuit component is mounted at another substrate surface, at the power receiving-side substrate that includes a substrate front surface and a substrate back surface; and

the power transmitting-side coil and the power receiving-side coil are magnetically coupled with each other so as to allow power to be contactlessly fed from the power transmitting-side substrate to the power receiving-side substrate, wherein

a looped first shield pattern is formed at the power transmitting-side substrate inward relative to the conductive pattern at the power transmitting-side coil so as to surround the rotating shaft, and

a looped second shield pattern is formed at the power receiving-side substrate inward relative to the conductive pattern at the power receiving-side coil so as to surround the rotating shaft.

2. The rotating body non-contact power-feeding device according to claim 1, wherein:

a gap between adjacent pattern line portions is set greater than a pattern line width in the conductive pattern at the power transmitting-side coil; and

the power receiving-side coil assumes a plurality of turns and a gap between adjacent pattern line portions is set greater than a pattern line width at the power receiving-side coil.

3. The rotating body non-contact power-feeding device according to claim 1, wherein:

the power receiving-side circuit component generates data to be transmitted to the power transmitting-side substrate; and

a load modulating circuit, which enables data transmission from the power receiving-side coil to the power transmitting-side coil by altering a power receiving side impedance based upon the data, is disposed at the power receiving-side substrate.

4. The rotating body non-contact power-feeding device according to claim 3, wherein:

a Q value for the power receiving-side coil is set greater than a Q value for the power transmitting-side coil.

5. A torque sensor, comprising:

the rotating body non-contact power-feeding device according to claim 3; and

a torque measuring strain gauge fixed to the rotating shaft, which is engaged in operation with electric power fed from the power transmitting-side substrate to the power receiving-side substrate, wherein;

the load modulating circuit alters the power receiving side impedance based upon strain data detected via the torque measuring strain gauge.

6. The torque sensor according to claim 5, further comprising:

a flexible cable that connects the torque measuring strain sensor to the power receiving-side substrate, wherein;

the torque measuring strain gauge is fixed to the rotating shaft so that the flexible cable is led out from the torque measuring strain gauge along a direction running away from the substrate surface at which the power receiving-side circuit component is mounted; and

the flexible cable led out from the torque measuring strain gauge is bent in a circular arc and is connected to the power receiving-side substrate.

7. The torque sensor according to claim 5, wherein:

at least three through holes, at which the power transmitting-side substrate is screwed onto the holding unit, are formed in a peripheral area of the power transmitting-side substrate; and

the plurality of through holes are set apart from the center of the power transmitting-side coil formed at the power transmitting-side substrate by distances different from one another.

8. The rotating body non-contact power-feeding device according to claim 1, wherein:

at least part of a pattern area where the conductive pattern is formed at the power transmitting-side coil faces opposite a pattern area where the conductive pattern is formed at the power receiving-side coil.

9. The rotating body non-contact power-feeding device according to claim 8, wherein:

the power transmitting-side substrate and the power receiving-side substrate are each a circular substrate and the rotating shaft passes through the power transmitting-side substrate and the power receiving-side substrate so that an axial center thereof is in alignment with centers of the power transmitting-side coil and the power receiving-side coil;

a difference between an inner diameter of the power transmitting-side coil and an outer diameter of the rotating shaft is greater than a difference between an outer diameter of the power transmitting-side substrate and an outer diameter of the power transmitting-side coil; and

a difference between an inner diameter of the power receiving-side coil and the outer diameter of the rotating shaft is greater than a difference between an outer diameter of the power receiving-side substrate and an outer diameter of the power receiving-side coil.

10. A rotating body non-contact power-feeding device according to claim 1, wherein:

the power receiving-side circuit component and wiring connecting the power receiving-side circuit component are disposed at the power receiving-side substrate so that rotational symmetry is achieved with respect to centrifugal force applied to the power receiving-side substrate.

11. A rotating body non-contact power-feeding device, comprising:

a power receiving-side substrate with a power receiving-side circuit component mounted thereat, which is fixed to a rotating shaft supported via a bearing and rotates as one with the rotating shaft; and

a power transmitting-side substrate with a power transmitting-side circuit component mounted thereat, which is fixed to a holding unit holding the bearing so that a substrate surface thereof faces opposite a substrate surface of the power receiving-side substrate and is connected with a power source, wherein;

a power transmitting-side coil is formed with a conductive pattern so as to achieve a flat-plane spiral pattern with a plurality of turns at a substrate surface facing opposite the power receiving-side substrate and the power transmitting-side circuit component is mounted at another substrate surface, at the power transmitting-side substrate that includes a substrate front surface and a substrate back surface,

a power receiving-side coil is formed with a conductive pattern so as to achieve a flat-plane spiral pattern with at least one turn at a substrate surface facing opposite the power transmitting-side substrate and the power receiving-side circuit component is mounted at another substrate surface, at the power receiving-side substrate that includes a substrate front surface and a substrate back surface; and

the power transmitting-side coil and the power receiving-side coil are magnetically coupled with each other so as to allow power to be contactlessly fed from the power transmitting-side substrate to the power receiving-side substrate, wherein

at least part of a pattern area where the conductive pattern is formed at the power transmitting-side coil faces opposite a pattern area where the conductive pattern is formed at the power receiving-side coil,

the power transmitting-side substrate and the power receiving-side substrate are each a circular substrate and the rotating shaft passes through the power transmitting-side substrate and the power receiving-side substrate so that an axial center thereof is in alignment with centers of the power transmitting-side coil and the power receiving-side coil,

a difference between an inner diameter of the power transmitting-side coil and an outer diameter of the rotating shaft is greater than a difference between an outer diameter of the power transmitting-side substrate and an outer diameter of the power transmitting-side coil, and

a difference between an inner diameter of the power receiving-side coil and the outer diameter of the rotating shaft is greater than a difference between an outer diameter of the power receiving-side substrate and an outer diameter of the power receiving-side coil.

12. A rotating body non-contact power-feeding device, comprising:

a power receiving-side substrate with a power receiving-side circuit component mounted thereat, which is fixed to a rotating shaft supported via a bearing and rotates as one with the rotating shaft; and

a power transmitting-side substrate with a power transmitting-side circuit component mounted thereat, which is fixed to a holding unit holding the bearing so that a substrate surface thereof faces opposite a substrate surface of the power receiving-side substrate and is connected with a power source, wherein;

a power transmitting-side coil is formed with a conductive pattern so as to achieve a flat-plane spiral pattern with a plurality of turns at a substrate surface facing opposite the power receiving-side substrate and the power transmitting-side circuit component is mounted at another substrate surface, at the power transmitting-side substrate that includes a substrate front surface and a substrate back surface,

a power receiving-side coil is formed with a conductive pattern so as to achieve a flat-plane spiral pattern with at least one turn at a substrate surface facing opposite the power transmitting-side substrate and the power receiving-side circuit component is mounted at another substrate surface, at the power receiving-side substrate that includes a substrate front surface and a substrate back surface; and

the power transmitting-side coil and the power receiving-side coil are magnetically coupled with each other so as to allow power to be contactlessly fed from the power transmitting-side substrate to the power receiving-side substrate, wherein

the power receiving-side circuit component and wiring connecting the power receiving-side circuit component are disposed at the power receiving-side substrate so that rotational symmetry is achieved with respect to centrifugal force applied to the power receiving-side substrate.