Patent ID: 8860405

Claim:
An angle sensor comprising: a sensor rotor to be mounted on a rotary shaft and having a surface on which a planar coil is formed; and a sensor stator placed with a surface facing the surface of the sensor rotor, wherein the sensor stator includes: a stator substrate; a plurality of forward-direction planar coils each wound in a spiral form in a forward direction and a plurality of reverse-direction planar coils each wound in a spiral form in a reverse direction opposite to the forward direction, the forward-direction planar coils and the reverse-direction planar coils being formed on the stator substrate and electrically connected so that the reverse-direction planar coils are in opposite phase to the forward-direction planar coils; a positive terminal and a negative terminal provided to be connectable to an external device; and connecting wires including a turn-back connecting wire and other connecting wires, wherein the forward-direction planar coils and the reverse-direction planar coils are respectively alternately arranged in a circumferential direction and connected in series through the connecting wires to form a series of planar coils having a first end and a second end, the first end being connected to the positive terminal through the other connecting wires and the second end being connected to the negative terminal through the turn-back connecting wire, and wherein the connecting wires are placed along circumferential arrangement of the series of planar coils but in a range less than a full circle of the circumferential arrangement, and the turn-back connecting wire connected to the second end of the series of planar coils is placed to extend from the second end along the other connecting wires and connected to the positive terminal or negative terminal.