Selection of the excitation capacitor for dynamic braking of induction machines

The application of self excitation in dynamic braking of induction machines using one or three equal excitation capacitors is discussed. Analytical expressions are derived to determine boundary values of the excitation capacitor as functions of the machine parameters as well as speed for different configurations. Various factors which influence braking performance are examined. Guidelines are proposed for the proper selection of excitation capacitor for dynamic braking induction machines. Theoretical results are verified experimentally using a laboratory machine