Abstract
In this article, a new type of magnetorheological brake is designed and its torque characteristics are investigated experimentally. The proposed magnetorheological brake consists of an outer housing, a rotating drum, magnetorheological fluid, and a copper wire coiled magnetic core to generate a magnetic field. At first, the structural configurations of the magnetorheological brakes are presented with conventional and modified magnetic core shape. To achieve enhanced braking torque under limited small size, a modified magnetic core shape is adopted in the proposed magnetorheological brake. After manufacturing the magnetorheological brakes and measurement of braking torque, it is verified that the proposed magnetorheological brake with modified magnetic core shape has improved braking torque compared to conventional-type magnetorheological brake. For the actuator application, the dynamic characteristics, such as rising time, settling time, and falling time, of the proposed magnetorheological brake is also experimentally evaluated by observing the step response. In addition, the torque tracking control performance is also investigated by adopting fuzzy–proportional–integral–derivative control algorithm for desired input of sinusoidal and multi-magnitude step input. It is demonstrated that the proposed magnetorheological brake can be successfully used as an actuator with limited small size.
Highlights
Magnetorheological (MR) fluid is a kind of smart material, and its rheological property is changeable in response to an external magnetic field because MR fluid is composed of ferromagnetic particles and carrier fluid such as mineral, hydrocarbon, and silicone oil
It is definitely observed that the proposed-type MR brake can generate about 10% larger braking torque compared with conventional-type MR brake for each applied current from 0.5 to 2.0 A
A new type of MR brake has been designed for a haptic actuator application, and its performances have been evaluated experimentally
Summary
Magnetorheological (MR) fluid is a kind of smart material, and its rheological property is changeable in response to an external magnetic field because MR fluid is composed of ferromagnetic particles and carrier fluid such as mineral, hydrocarbon, and silicone oil. A new type of MR brake which increases the area where the MR effect is generated by modifying the shape of the magnetic core is designed and it is demonstrated through experiments that the proposed MR brake has better performance than the conventional MR brake. The controllable torque generated from MR effect can be expressed as following two equations for disc-type and drum-type MR brake, respectively ty(B)2pr rdr
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