D-C Braking of Induction Motors

The rapid deceleration of induction motors from relatively high speeds to standstill by the application of constant potential to the terminals is considered in this paper. Applications in which d-c braking of induction motors is desirable are mentioned, and the fundamental principles involved in this method of braking are considered. The characteristics of the speed-torque curve are derived from these principles. The practical application of d-c braking is demonstrated by the results of extensive tests, and a simple means of calculating the approximate values of current and wattage necessary for braking is included.