Shutdown – In certain applications there is a need to use a rapid motor and load deceleration. When disconnected from the power line, the electric motor uses a rotation reversing device with the motor still running. Stopping or shutting down the mains motor takes place through a relay preventing the motor from breaking in the opposite direction. In the case of synchronous electric motors, dynamic braking is used.
Direction or Direction of Rotation – Most motors (except some, such as single-phase motors such as shaded pole and repulsion motors) can be used in both directions of rotation depending only on adequate control to achieve this . The direction of rotation of the axis of a DC motor is imposed by both the north-south polarity of the field flux and by the direction of the armature current. To reverse the direction of rotation, simply change the polarity of the DC source that feeds the field winding or DC source that feeds the armature, this in the case of independent excitation.