Metro train now becomes the backbone of our transportation. It reduces the dependence on buses, locomotive railways, car, and other vehicles. It becomes an important part of our life because of its services and high speed. We will discuss in this article how its braking system works.

What is Regenerative Braking system?

The regenerative braking system used in the electric trains and vehicles. Regenerative braking is an energy recovery mechanism which slows a vehicle or object by converting its kinetic energy into a form which can be either used immediately or stored until needed. In the process of the train when  train applied a brake, kinetic energy releases and the current in the motors reversed which acts as a generator.

How does it act as a generator?  These brakes shift the automobile’s electric motor into reverse which makes it run backwards, in turn slowing the car’s wheels. While running backwards, the motor also acts like an electric generator by creating electricity that’s delivered into the car’s batteries. It is also called as energy saving process because the regenerated electrical energy which is supplied back to the OHE is used by other accelerating trains in the same line.

Thus by the help of  Regenerative Braking, we can use electricity in a very effective way and reduced wear of mechanical brakes.

How regenerative braking system work?

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When we step on the brake pedal the transitional energy is converted into the rotational energy. The energy storage unit requires a unit that can handle torque and speed demands of the vehicle smoothly. An ON-OFF engine control system is used. That means that the engine is ON until the energy storage unit has been reached desired charge capacity and then is decoupled and
stopped until the energy storage unit charge fall below its minimum requirement. Brake controllers are electronic device that can control brakes remotely, deciding when braking begins ends, and how quickly the brake need to be applied. During the braking operation the brake controller directs the
electricity produced by the motor into the batteries or capacitors.

During accelration, the generator acts as an elecrtic motor drawing electric energy from  batteries to give extra driving force. During brake electric supply is cut off.

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How Metro Braking System works?

Each bogie is equipped with a spring-applied brake caliper. Each bogie has two independent hydraulic circuits: a service circuit and an auxiliary circuit . An electro-hydraulic module (EHM) mounted under the metro body performs simultaneously. The electrohydraulic module contains the entire hydraulic brake activation equipment, consisting of hydraulic pressure generation, pressure regulation, and electric brake control. All components are electrically controlled and monitored via three independent brake control units of type HEY-C which are integrated into the EHM module. Braking and electric control functions performed by the EHM module