A novel bidirectional and dual-redundancy hybrid electromagnetic brake for aircraft

Abstract

This article presents a novel bidirectional and dual-redundancy hybrid electromagnetic brake with strong retention force and high reliability. The electromagnetic brake with two large working air gaps consists of two stationary components and a movable component which is fixed to the shaft. The stationary components are composed of iron cores, yokes, and two sets of coil windings in which one set of redundant ones can improve reliability. The movable component consists of a permanent magnet ring and yokes. When the power is outage, the permanent magnet can provide a constant retention force to keep the movable component park at end position. When the power is on, the working magnetic fluxes of the hybrid electromagnetic brake are generated by both the permanent magnet and the coil windings carrying DC forward or reverse current. The magnetic fluxes produced by coil windings control the movement direction of the movable component to realize braking or unlocking. First, the constraint conditions of magnetomotive force to ensure bidirectional movements were deduced using the equivalent magnetic circuit method. Then, the magnetic flux density and the electromagnetic forces were calculated by the finite element method. Simulation results validated the theoretical analysis and the reasonable design. This electromagnet can be used for the electrical brake not only in the more electric aircraft but also in other applications.

Analysis of electromagnetic-thermal coupling braking properties of combined electromagnetic friction and shape memory alloy brake

“…Yasa et al [17] propose an electromagnetic brake design method, and have established an optimal analytical mathematical model of the brake, to provide theoretical support for the design and optimization of critical parameters of electromagnetic brakes. Xiao et al [18] adopts the arrangement of double energized coils to increase the electromagnetic force generated, increased braking torque and enhanced reliability of the braking device. Jin et al [19] discussed the temperature field of the braking device, and through combining theoretical calculation and FEM, the results show that frictional thermal causes only a significant increase in material temperature near the contact surface, and the temperature rise value depends mainly on the current value.…”