What is plugging in induction motor?

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     When an AC motor is supplied with a three-phase power source, the phases must be connected in a specific sequence, known as the phase sequence. This sequence is critical for proper operation of the motor.


     When the phase sequence is reversed by interchanging the connection of any two phases of the stator on the supply terminal, the direction of the rotating magnetic field generated by the motor is also reversed. This causes a reversal in the direction of rotation of the motor. This condition is known as plugging.

     Plugging occurs when a motor is already running at a certain speed, and then the phase sequence is reversed, causing the motor to slow down and eventually stop. This is because the motor is now operating as a generator, producing electrical power that flows back into the power supply system. This power flow causes a braking torque that opposes the motion of the rotor and slows it down.

     Plugging is often used as a method of quickly stopping a motor, particularly in emergency situations where a rapid shutdown is necessary. However, it is not recommended as a routine method of stopping a motor, as it can cause mechanical stress and damage to the motor and its components.

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