科研之友
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摘要
This paper presents a new configuration and optimal design of a novel multilayered cylindrical magnetorheological (MR) brake. Compared to the traditional ones, this designed MR brake employs several coils setting along the circumferential direction in order to increase the magnetic field strength within the MR fluid. Four annular working gaps of each serpentine gap are used to reduce the effect of centrifugal force at high speed rotating conditions. Furthermore, this novel MR brake provides flexible options for torque enhancement because either the axial or radial dimensions of the working gaps can be adjusted. After describing the structure, exact closed-form expressions of the braking torque have been derived in order to calculate the braking torque and evaluate the merits of the designed MR brake. The magnetic circuit analysis of the MR brake is conducted to theoretically estimate the magnetic field strength in the working gaps. After that, simulations were performed to optimize the structure sizes of the designed MR brake, and evaluate its performance. The results indicate that the proposed MR brake can generate a considerable braking torque while maintaining a feasible magnetic circuit design and a compact structure.
