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

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.

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.