Development of a Magnetically Activated Brake System

Faizul Akmar, Abdul Kadir and Khisbullah, Hudha and Mohd. Zakaria, Mohd. Nasir and Ubaidillah, . (2007) Development of a Magnetically Activated Brake System. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Hydraulic Brake System used in automotive brake still becomes a major idea due to its capability and availability. However, it has several limitations and disadvantages such as the response delay, wear of braking pad, requirement of auxiliary components (such as hydraulic pump, booster, pipelines, master cylinders etc.) and increasing total weight due to its auxiliary components. Regards to these limitations, a relatively new brake device utilizing magnetorheological fluid to replace this conventional system is presented in this study. Such a brake employs mechanical components as well as electrical components, resulting in more reliable and faster braking actuation. The aims of this work are to design, model and simulate a magnetorheological brake (MRB) system that has benefits over the conventional braking system. Basically, the drumtype MRB consists of rotating disk immersed in a MR fluid and enclosed in an electromagnet coil. The magnetized coil causes solidification of the MR fluid so that the shears stress between the moving part and static part increases resulting in the decrement speed of the moving part. The shear stress can be varied by applying various electric current to the winding coil. In this paper, the study began from the part design using 30 modeling software, following with the finite element simulations involving magnetostatic analysis. The mathematical model is derived based on drum-type MR brake. The simulation and experimental study on the stopping time and braking torque were also performed and compared to each other. Several performances in terms of torque versus time and speed decrement versus time were investigated by applying various electric current.

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