Times Of Electric

  What is plugging? T he process of suddenly stopping the running motor by electrical method is called Electrical braking. It is used to stop the motor at a specific position, preventing the motor from over speeding.   One of the type of electrical braking is called plugging. It is also known as counter current braking. Plugging is the process of braking the motor by changing the direction of the motor rotation. This direction of rotation of electric motor is dependent on several variables. For ac machines, the phase sequence of the stator winding are one of the variable and dc machines, the polarities of the field or armature voltage. In ac machines, the shaft of the machines rotates in the same direction as the magnetic field. This direction of rotation of the field in the air gap depends on the phase sequences connection of the stator windings.   When the three phase stator windings are connected in the RYB sequence, the air gap field rotates in one direction at nearer...

  What is electrical braking and its types?   Whenever an electric motor or drive is disconnected from the supply. The speed of the motor gradually decreases and becomes zero. Braking is a generic terms used to set a described operating conditions for electric drives. Such as rapid stopping of motor, holding the shaft to a specific position,maintaining the speed to a desired value preventing from over speeding. The process done by electrical equipment is called Electrical braking.   Electrical braking is used more than mechanical braking because of this reasons. High operating efficiency No heat emission produced due to friction in mechanical braking Less maintenance.   During electrical braking, the motor is made to work as a generator, it produces a negative slip and negative torque(braking torque). This is achieved by suitable changing the electrical connections of the motor.   The braking of the drive should be such as to stop the motor at the specified poin...