Types of Electric Breaking | Regenerative break | Reverse Current Breaking | Rheostatic Breaking - Electrical Diary -->

# Definition of Electric Braking

A smooth and safe reduction in the speed of the electric motor is called electric braking. The application of motors, it requires a quick, accurate, or rapid stop of the motor. there are three different types of electric braking is used in an electric motor. these are:-
• Regenerative Braking
• Dynamic braking or Rheostatic braking
• Plugging or Reverse Current braking

## Regenerative Breaking |Regenerative break System

it is a form of braking in which the kinetic energy of the running machine is used to run the motor as a generator during the braking period. this type of braking is possible when the driven load forces the motor to run at a speed that is greater than the no-load speed of the motor at a constant excitation.

when the motor starts to run due to the kinetic energy of the running machine as a generator, the back emf of the motor is greater than the external terminal voltage and due to this, the armature current of the motor gets reversed and now the electrical power is starting to supply to the source.

Regeneration of electric energy is possible with a shunt and separately excited motors and with compound motors with weak series compounding. Series motor needs a reversal of either the field or armature connections.

### Plugging or Reverse Current Braking

it is a special case of braking of electric motor. Electric braking is used to either increase or decrease the speed of the motor not to shut down the motor. reverse current braking is used to maintain the speed of the locomotive, lift, elevator, etc constant when the motor starts to run at a speed higher than its no-load speed.

When a motor starts to run at a speed higher than its no-load speed motor, this motor act like a generator, and a reverse current starts to flow. this phenomenon happen in electro locomotive moving down a gradient,

during this condition, constant speed is necessary, and to maintain this constant speed this motor is connected as a generator while this motor run of the gradient.

### Dynamic or Rheostatic Braking

In this braking, the running dc motor is disconnected from the supply and a braking resistor is connected across the armature circuit.

After disconnecting from the main supply the motor starts to operate as a generator and the generated electric energy is used in the braking resistor while running as a generator develops a braking torque which results in speed reduction of the motor.
For dynamic or rheostatic braking separately excited motor is used because during the generating period, it will be easy to maintain the magnetic flux of the motor constant.