Enter the braking force and the effective disc radius into the calculator to determine the regenerative braking torque.

Regenerative Braking Torque Formula

The following formula is used to calculate a regenerative braking torque. 

RBT = Fb * Re
  • Where RBT is the regenerative braking torque (N-m)
  • Fb is the total braking force (N)
  • Re is the effective disc radius (m)

To calculate the regenerative braking torque, multiply the braking force by the effective disc radius.

What is a regenerative braking torque?

Definition:

A regenerative braking torque is the total braking torque captured/applied by a regenerative braking system.

How to calculate a regenerative braking torque?

Example Problem:

The following example outlines how to calculate a regenerative braking torque.

First, determine the braking force. Using the calculator linked about, the braking force is measured to be 500N.

Next, determine the effective disc radius. This is measured to be .5m.

Finally, calculate the braking torque using the formula above:

RBT = Fb * Re

RBT = 500 * .5

RBT = 250 N-m

FAQ

What is regenerative braking and how does it differ from traditional braking systems?

Regenerative braking is a technology used in electric and hybrid vehicles that captures the vehicle’s kinetic energy during braking and converts it into electrical energy, which can then be used to recharge the vehicle’s battery. This contrasts with traditional braking systems, where the kinetic energy is converted into heat through friction and dissipated into the environment, thus wasting the energy.

Can regenerative braking systems completely replace conventional brakes?

No, regenerative braking systems cannot completely replace conventional brakes. While regenerative braking is effective at slowing down a vehicle, conventional friction brakes are still necessary for situations requiring sudden stops or when the battery is fully charged and cannot absorb more energy. Thus, most vehicles equipped with regenerative braking also have a conventional braking system for safety.

What are the benefits of using regenerative braking torque calculations in vehicle design?

Using regenerative braking torque calculations in vehicle design helps engineers optimize the efficiency of the regenerative braking system, ensuring maximum energy recovery while maintaining safe braking performance. It allows for the precise design of braking components, such as the size of the brake disc and the specifications of the braking force required. This not only improves the vehicle’s overall energy efficiency but also can extend the range of electric and hybrid vehicles by effectively reusing the energy that would otherwise be lost during braking.