When AC voltage is removed from a motor, it coasts to a stop. The time it takes to coast to a stop is dependent on the motor and load. DC injection braking is a method of decelerating the motor at a faster rate than it would with a natural coast. The drive applies a DC voltage across the AC motor windings, creating a constant magnetic field which in turn applies a constant torque on the rotor, causing the motor to decelerate more quickly.