The electric current sensor and the magnetic field sensor which use the magnetic bridge, and this magnetic bridge for the sensor which uses the magnetic fluid

摘要

Topic The sensor which uses the magnetic fluid which can cancel the offset problem of the particular sensor, in other words using for the electric current sensor and the magnetic field sensor, and these sensors, the magnetic bridge which it formed with the useful magnetic fluid, and, offer the magnetic circuit casing in order to form the magnetic fluid where shape does not become settled that way in the magnetic bridge of necessary form.Solutions Preservation type doing the magnetic fluid in container, 11 annular magnetic circuit mr1 and mr2 which two which it formed segregates it has exciting coil L1 and L2 which winding are done for aforementioned connected magnetic circuit cr1 and cr2 which are driven by the magnetic circuit and the magnetization drive expedient which connect with connected magnetic circuit cr1 and cr2 by the ferromagnetic material, selecting the reluctance in the aforementioned magnetic circuit appropriately, harmony of magnetic flux of annular magnetic circuit mr1 of the aforementioned two and mr2 becomes zero, (size of magnetic flux being the same, direction becomes opposite) tried to make magnetic state of equilibrium reveal. Selective figure Figure 5