Patent ID: 11898922
Assignee: KABUSHIKI KAISHA YASKAWA DENKI
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 19:
20. A torque calculation method comprising:
providing a torque sensor including
a strain body, and
a plurality of optical sensors arranged at a plurality of positions of the strain body in a circumferential direction, and configured to detect a deformation of the strain body,
wherein the strain body includes
an outer peripheral body having a ring shape, and
an inner peripheral body of which at least a part is disposed inside the outer peripheral body in a radial direction, and

wherein each of the plurality of optical sensors includes
a scale fixed to one of the outer peripheral body and the inner peripheral body, and disposed between the outer peripheral body and the inner peripheral body, and
a detector fixed to a remaining one of the outer peripheral body and the inner peripheral body, and disposed to face the scale between the outer peripheral body and the inner peripheral body, and
wherein a substrate of the torque sensor is disposed in a space formed between the outer peripheral body and the inner peripheral body, and is provided with the detector,

acquiring outputs of the plurality of optical sensors; and
adding the outputs of the plurality of optical sensors, thereby calculating a torque based on a result of the addition.