A drum gap magnetorheological fluid brake is proposed to address the shortcomings of the traditional cylindrical magneto-rheological fluid brake with a small braking torque.Drum magnetorheological fluid brakes have a larger working volume of magnetorheological fluid than cylindrical,resulting in significantly improved braking performance.The magnetic field analysis of the device is carried out by the finite element method,and the influence of two gap shapes and drum tension angle on the magnetic field and the relationship between magnetic induction strength and axial distance under different currents are obtained;the relationship between torque and magnetic induction strength,radius,angular velocity and other parameters of drum magnetorheological fluid brake is established.The results show that the effect of the drum-shaped tension angle on the working volume of the magnetorheological fluid is significant;the brake torque increases with the increase of current,and the output torque at 3 A is 10.56 N·m which is 23.6%higher than that of the cylindrical magnetorheological fluid brake.
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