Research on Theory and Simulation of Magnetic Liquid Micro Differential Pressure Sensor

Abstract

With magnetic liquid micro differential pressure sensor as the research object, using the finite element analysis software COMSOL, magnetic liquid micro differential pressure sensor are analyzed and calculated by first hall element in the location of the magnetic field change curve, and then analyzed the magnetic liquid micro differential pressure sensor restoring force curve, analyzes the three different change trend of the spacing between the initial magnetic field force, And the change equation of magnetic force is fitted. Finally, the pressure resistance of the magnetic liquid micro-differential pressure sensor is calculated to ensure the integrity of the magnetic liquid sealing ring in the range of measurement, so that it has good sealing performance. The results show that when the distance between two cylindrical permanent magnets L=10mm, the magnetic flux density B at the central axis changes approximately linearly with the distance. The recovery force curve of permanent magnet has good linearity in the spacing range of 24mm ~ 40mm. The sensor has a four-stage magnetic liquid sealing ring, the overall pressure resistance value is four times the unilateral pressure resistance capacity, the theoretical pressure resistance value of magnetic liquid is 5000Pa.