New approach to design MR brake using a small steel roller as a large size magnetic particle

Nowadays, conventional Magneto-Rheological (MR) fluid has been commonly used in many types of device operating within three its modes that have widely known as valve, shear and squeeze film modes. Except valve mode, shear and squeeze film modes just can generate the weak resistance force. Therefore, this paper proposes a new approach with the purpose that it can help to increase the weak force in shear mode by the application of a large size magnetic particle which is a small steel roller. This kind of particle with its hydrodynamic form helps the new MR brake device which can generate the higher braking torque than the conventional one. The theory of this proposed approach is based on the deformation theory with the support of the improved magnetic field. The practical application of this approach has been examined by experimental results.