MAGNETOSTRICTIVE FORCE SENSOR AND SENSOR SYSTEM

摘要

To provide a magnetostrictive force sensor and a sensor system which can detect a load on a core with almost the same accuracy when the core and a yoke are in any relative positional relation.SOLUTION: A force sensor 1 includes a core 2, a coil 3, a first yoke 41, and a second yoke 42. The core 2 has a shaft 20 and receives a load along the shaft 20. The coil 3 is arranged around the shaft 20 and is magnetically connected to the core 2. The first yoke 41 is magnetically connected to a first magnetic pole 21 in a first end of the core 2 in a longer direction of the shaft 20. The second yoke 42 is magnetically connected to a second magnetic pole 22 in a second end of the core 2 in a longer direction of the shaft 20. The core 2, the first yoke 41, and the second yoke 42 are formed in a magnetic circuit in which a magnetic flux from the coil 3 passes through by conduction. The magnetic circuit has a gap G1 between the first yoke 41 and the second yoke 42 in the longer direction of the shaft 20.SELECTED DRAWING: Figure 6