Abstract
In investigating magnetorheological (MR) brakes, it is well known that the braking torque is the important factor in the structure’s design and the temperature of MR fluid in the brake is required to be within the operating range. In addition, the stress condition of the component changes obviously in the combined effects of force and thermal load which may result in structural damage. This study aims to propose a multi-cylindrical MR brake with a high-torque and investigate it more comprehensively in multi-field simulation. To achieve this goal, the mathematical model of the braking torque and the computing platforms of Maxwell and Ansys workbench are adopted to explore the influence of the exciting current and the number of braking cylinders on the braking performance, as well as the temperature and structural stress distribution of the braking cylinder during braking. The magnetic analysis shows that the proposed magnetic circuit is reasonable. The relationship between braking torque and exciting excitation current is nonlinear. The thermal simulation analysis shows that the temperature of MR brake remains within operating range of MR fluid after braking. The structural stress analysis shows that the contact position of braking cylinder and magnetism-insulator is the easiest place to break.
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