Patent ID: 11879792
Assignee: XELA ROBOTICS CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. A magnetic sensing system comprising a sensing device that generates an electrical signal according to the strength of a magnetic field that changes in response to the action of an external force and a detection device that detects a physical quantity associated with the action of the external force from a change in the magnetic field based on the electrical signal from the sensing device, wherein
the sensing device comprises a sensor body attached to a site where the physical quantity is to be measured and a current supply unit connected to the sensor body and configured to supply a current,
the sensor body comprises a displacement unit that is displaced by the action of the external force, an electromagnet unified with the displacement unit, and a magnetic sensor configured to measure the strength of a surrounding magnetic field,
the current supply unit is configured to supply a current to the electromagnet so as to vary the strength of a measurement magnetic field generated by the electromagnet, and
the detection device uses a relational expression stored in advance to specify, on a basis of fluctuations over time in the measurement magnetic field generated by the electromagnet, a magnetic interference amount corresponding to the strength of an interference magnetic field generated near the magnetic sensor separately from the measurement magnetic field, and calculates the physical quantity by removing the influence of the magnetic interference amount.