Simulation study on the characteristic of ferromagnetic wear debris in inductive wear debris sensor

Aiming at the on-line monitoring sensor of mechanical devices, transient characteristics of magnetic field for sensor coils and transient variation characteristics of induced voltage for induction coil are simulated during the process of ferromagnetic wear debris getting through the inductive wear debris sensor. Taking the materials of the coils and debris, turns of the coils, and input voltage of the excitation coils into account, a 2-D model of finite element method (FEM) is built for the coils of the sensor using the software Jmag Designer 10.4. Simulation results reveal the variation laws of the coil magnetic field and induced voltage of the induced coil during the process of debris movement. Moreover, research results show that the induced voltage of the induced coil is proportional to the cube of spherical debris diameter and is also proportional to the operating speed of the debris, which is of great value for the development of inductive debris sensor.