Design of MR rotary brake with permanent magnet

영구자석을 이용한 회전형 MR 브레이크의 설계

In this paper, a novel MR brake with permanent magnet is developed. This system consists of rotary disk, permanent magnet, spring and MR fluid. Permanent magnets are attached to the rotary disk and moves in the direction of radius. The magnets are linked to rotor axis by spring. As rotation speed increases, the magnets move outward from the center of the system by centrifugal force in the MR fluid. A proper design of stator or case makes the system have unique torque characteristics. To show the performance of the system, the research is performed by following procedure. First, the electromagnetic characteristic of the system is analyzed using FEM and commercial code, Maxwell is used for this analysis. Then, torque is calculated using the result of the electromagnetic analysis to validate the performance of the system.