Multi-physical Field Numerical Analysis and Experiment on Magnetorheological Brake of Traction Elevator

Brake is an important safety device for traction elevators, and its safety and reliability ensure the safe operation of elevators. The work, analyzing the standardized original parameters of elevators, designed a new brake device based on magnetorheological effect. The mathematical physics method was used to establish the multiphysics mathematical model of magnetic field, flow field and rotor dynamic equation of device in finite element software. The model considered the influences of the uneven distribution of magnetic field as well as the changes of rotational speed, volumetric force and temperature change on magnetorheological fluid. Thus, the simulation was close to the actual device. The model was used for the dynamic simulation, which revealed the variation of braking torque, braking time and temperature of magnetorheological braking device under different currents and speeds. The simulation results are consistent with the experimental results, and the magnetorheological brake has the advantages of small impact, low noise, fast response and easy control when used in elevator. Research achievements of the work provide new thought for new brake device of traction elevator in engineering field.