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Regenerative
Braking
When you drive your forklift, a lot of energy is wasted
each time you brake to come to a stop at an intersection,
make a turn, etc. In effect, the energy of your forward
momentum is lost in the form of heat in your forklift’s
brakes. More energy is then needed to reaccelerate you
back to your previous speed.
The idea behind regenerative braking is to recapture
some of the energy that would otherwise be wasted by
braking, store that energy in batteries so that energy
can later be used when you reaccelerate. The working
of the regenerative system extends the available operation
hours and the service life of the brake linings. This
idea is widely used in both DC and AC-equipped forklift
drive systems.
How does it work? Because many electric motors can
also operate as generators, the same electric motor
that helps to propel the forklift is also used to generate
electricity and recharge the battery. The more electricity
that is drawn from the motor/generator to charge the
batteries, the more drag the motor/generator creates,
effectively slowing down the forklift.
Some of the main operation features on some models
are:
Accelerator Off or Coast Braking – This
feature is active when the forklift travels with the
accelerator off. If the driver is not well-enough informed,
this feature is sometimes misinterpreted as the service
brake is dragging. This is a good feature to keep enabled.
It can improve travel speed control and stability because
it allows the operator to use the soft braking force
exerted by the motor. In most cases, the truck
can be tuned to the driver’s liking.
Brake Applied – Another condition that
can trigger the operation of the regenerative system
is when the operator applies the service brake slightly,
which opens or closes a brake switch.
Switch Back or Plug Braking – This feature
is triggered when the truck is moving and the directional
control is moved through neutral and into the opposite
direction. This function of an electric truck used to
just waste this generated energy as heat; now it is
routed back into the battery.
These are just some of the great benefits of owning an
electric forklift in this modern age. |