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Friday, 17 November 2017

How Regenerative Braking System works

     Hi, its Biswanath Bai with a new topic on How Regenerative Braking System Works.As the name describes it the braking system which not only reduces the speed or stops the vehicle, but also this breaking system generates the electricity. In traditional braking system, a brake pad is used to which press the wheel break plate to stop the vehicle by increasing the friction between the wheel and brake pad.In this way, the head is developed at the friction area which goes waste. That means a part of engine power is going waste. To save this power, the regenerative braking system is introduced.

How Regenerative Braking System
Add caBy Alan Trotter (Flickr: Electric car charging) [CC BY 2.0 (], via Wikimedia Commonsption
    So now the question develops is how the regenerative braking system works to develop electric power which will later be converted into the chemical reaction to recharge the battery. To generate electricity it is necessary to convert the heat/friction into electrical power/energy, for doing that a generator is introduced in the system. The installation of the generator in the car layout is done through different ways in different cars that depends upon the car is electric or fuel powered.

Regenerative Breaking System in Electric Cars

 The introduction of regenerative braking system in electric vehicles is very useful. The implementation is also very easy. No additional generator is needed. Here the induction motor is already used. For the implementation of the regenerative braking system, this induction motor can be used as a generator.

   When the break is applied, the cuts in the power supply from the battery and motor. Thus there is no power is produced in the motor. In this situation, the motion of the vehicle means the rotation of the wheel is free. In regenerative braking system, this rotation can be used to rotate the induction motor. In this particular situation the rotor speed is below the RMF value & due to this the induction motor act as a generator who got the rotation from the rear wheel. Thus electric energy is produced. This electric energy is used to recharge the battery pack by creating the chemical reaction inside the battery. In this way, the electric energy can be developed from the braking system & also can be saved in the battery for further use.

  As the electric cars run on battery, this can be very useful and also it may add extra miles range to run on a single charge.  The same technology can be used when de-acceleration the vehicle also. That is why the electric vehicle can be driven by using only the accelerator pedal and in order to completely stop the vehicle, the break can be applied. Also in the regenerative braking system, there is no brake pad so that the car will never need to change the brake pad. Also one of the most important disadvantages of this system is “this system does not lock the vehicle, addition break unit is required to lock the vehicle into slopes”.

Regenerative Braking System in Engine Assembled Cars

   The regenerative braking system in the fuel powered cars is more complicated than electric cars. Here an addition unit i.e. a Generator is necessary in order to develop the electric energy. The generator is directly connected to the engine. When the break is applied and also when the break is disengaged the engine power is supplied to the generator to generate electricity.

   But here the question arises is why? What is the purpose of using the regenerative braking system in fuel powered cars, when the engine itself generates more than sufficient energy to recharge the battery which is used for electrical instruments used in the vehicle? So this situation the regenerative system instead of making the vehicle fuel efficient, it may increase the fuel consumption & more cost of vehicles. But yes, this system can be used in those fuel powered vehicles where the electric consumption is high like in luxury automobile. This is the reason why the regenerative system is not used in most of the fuel powered cars but used almost in every electric car.

   After reading all of this, you must have thought if the only rotation is supplied from wheel to motor/generator then how the vehicle slow down? The answer is, the magnetic field inside the generator/motor opposes the rotation. Due to which the vehicles slow down and the speed reduced.

Mechanical Regenerative Breaking System

    There is another way to regenerate electrical energy through mechanical links. In this mechanism, a circular brake pad is used in frictional brake & the circular brake pad is connected with a generator at the center. Thus when the break will be applied the motor will rotate and develop electricity with this the magnetic resistance of the motor will oppose the speed of the vehicle.

Disadvantages of Regenerative Braking System

  1. The braking effect is low compared to traditional braking system,
  2. This system works well at high speeds, Works not effectively at low speeds.
  3. Doesn’t lock the vehicle like brake pads 

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