250 / 2024-03-14 13:13:44

Temperature Field Distribution of Permanent Magnet Overwinding Protection Device

Temperature Field;,Permanent Magnet,eddy current,Overwinding Protection

      When an overwinding accident occurs in hoisting system, the permanent-magnet type overwinding protection device(PMOPD) converts a majority of the hoisting container’s kinetic energy into heat. The large inertia of the hoisting containers causes high temperature heat source area in the rotor disk. This is beyond the temperature requirements of mine equipment in the "coal mine safety regulation". In the presented paper, firstly, the Finite Element Model(FEM) of the PMOPD was established by COMSOL software. Then, the influences of speed and load on the temperature distribution was simulated. The simulations show that a ring-shaped high temperature heat source area has been generated in the rotor disk. The radius of the area is positively correlated with the distribution radius of the permanent magnet, and the average temperature of the area is positively correlated with the speed and the load. Finally, experiments were conducted, which validated the FEM.