10-11-2014, 09:57 AM
Abstracts: The principle of braking in road vehicles involve the conversion of kinetic energy into heat. This high energy conversion therefor demands an appropriate rate of heat dissipation if a reasonable temperature and performance stability are to maintained. While the design, construction and location features severely limit the heat dissipation function of the friction brake, electromagnetic brake work in a cooler condition and avoid problems that friction brake face by using a totally different working principle and installation location. By using the electromagnetic brake as supplementary retardation equipment, the friction brake can use be used less frequently and therefor practically never reach high temperature. DESCRIPTION In this we are using a mild steel angle frame on which a AC motor is used with the guide supports and shaft on which a disc is mounted and there are electromagnets being fixed across the disc maintaining the air gap. Magnetic field produced by an electromagnet will be utilized for giving the required braking toque. Model will be made on a smaller scale. The working principle of the electric retarder is based on the creation of eddy currents within a metal disc rotating between two electromagnets, which set up a force opposing the rotation of the disc. If the electromagnet is not energized, the rotation of the disc is free and accelerates uniformly under the action of the weight to which its shaft is connected.