Electrical Engineering ⇒ Topic : Electric braking of series motor
Electric braking of series motor :
(1) Plugging. In this method (as in the case of shunt motors) the connections of the armature are reversed and a variable resistance R is put in series with the armature as shown in Figure.
(2) Rheostat braking. In this method of braking the motor is disconnected from the supply, the field connections are reversed and motor is connected in series with a variable resistance R as shown in Figure. The machine, obviously, is now running as a generator. The field connections are reversed to make sure that current through the field winding flows in the same direction as before (i.e., from A to B) in order to assist residual magnetism. In practice, the variable resistance employed for starting purpose is itself used for braking purposes.
Figure Rheostat braking
(3) Regenerative braking. In a series motor regenerative braking is not possible without modification because reversal of I would also mean reversal of the field and hence of Eb This method, however, is used with special arrangements in traction motors
!! OOPS Login [Click here] is required for more results / answer