A Novel Fast Braking System for Induction Motor

An effective and reliable fast braking system for three-phase induction motor designed with the combinations of two or more conventional braking methods are discussed in this paper. A series of experiments were conducted in order to find out the speed range at which the most effective and efficient braking occurs corresponding to each conventional braking method and also to determine the minimum capacitance required for self excitation. It is observed experimentally that the most effective and efficient braking may occurs by combining two or more different conventional braking methods in a particular sequences at the speed range where they are most effective, provided the switching is done in proper sequences and the time delays between successive stages of switching are correct. For proper switching and proper time delay a microcontroller can be used so that the switching and time delay are made easy and reliable. Finally, the experimental results for different conventional braking methods are presented in this paper.