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.
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.
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.
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.
Frequently Asked Question About Electric Braking
What are the different types of braking?
there are mainly three types of electric braking which is used to reduce the speed of the machinery which used a motor to operate it.
What do you mean by electrical braking?
Definition of electric braking. A system in which a braking action is applied to an electric motor by causing it to act as a generator.
Why braking is required?
Since the braking enables the Motor to dissipate the kinetic energy stored due to rotor inertia in the form of heat and hence the motor stops or brakes immediately when braking is applied
