What’s the difference?

Regenerative braking is the concept of using wasted

(potential) or mechanic energy and converts it into electri-

cal energy by a generator which charges the batteries and

the resistance from the generator aids the traditional brakes

in stopping the vehicle. Most of the energy that is used in

braking is wasted by heat. Regenerative braking reduces

the amount of heat regenerated by assisting the frictional

braking. The energy that is created by the generator is pro-

ducing an AC electrical current which charges the batteries.

http://alternativefuels.about.com/od/glossary/g/regenbraking.htm

The diagram above shows the energy flow in a regenerative

braking system.

Dynamic braking takes the current generated by a motor

in a braking mode and it sends it to a resistor bank. The

amount of resistance determines the braking force so it

can be controlled. Dynamic braking is the opposite of

regenerative braking. It uses a dc voltage created from

the generator to create a torque in the opposite direction

of the spinning wheel to apply a force from the resistor

bank to slow down the vehicle.

Regenerative Braking Dynamic Braking

The resistor bank

on the left has

variable resistance

to control the

speed of braking.

When the brakes

are applied the the

current goes to the

resistor bank and

this is where the

force that stops the

car comes from.

http://webpages.eng.wayne.edu/~az0131/Quiz%201.html

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Advantages/Disadvantages

Regenerative braking uses the wasted energy and stores

it

Dynamic braking aids the brake pads and rotors to stop

Regenerative braking is still inefficient

Dynamic braking requires larger resistors for more re-

sistance in stopping taking up space in the vehicle.

Braking News!!! Regenerative Braking vs. Dynamic Braking

Sources

There are different type regenerative braking, the most

common type is using the mechanical energy and changing

it into electrical energy. However another type is hydraulic

regenerative braking, where the braking energy is con-

verted to hydraulic pressure and stored in a high pressure

hydraulic accumulator. Upon acceleration the hydraulic

pressure is released to the transmission and it reduced the

amount of energy the engine needs to move the vehicle.

http://vnweb.hwwilsonweb.com.proxy2.cl.msu.edu/hww/results/

getResults.jhtml?_DARGS=/hww/results/results_common.jhtml.34

Hydraulic Regenerative Braking

Created by Daniel Morgan

Technology Systems Management

Michigan State University