It is very simple to
convert an ordinary car into an electric car. You must first know some basics
about a petrol car like the exact position of the engine, petrol tank, muffler
and so on. Here is a simple description of making an electric car.
For making an electric
car the following components must be purchased.
§ AC
electric motors
§ Electric
controller
§ Battery
tray
§ 12V
Lead acid batteries
§ Battery
Charger
§ Many
motors for driving smaller parts
Given above is a well
explained diagram of a car that shows both the physical components of an
electrical as well as petrol car. The comparison between them is also given.
Since the components for both
the cars are different, they must be replaced. For this, all the major
components like petrol/diesel engine, muffler, catalytic converter,
petrol/diesel tank and also the exhaust pipe must be removed. The clutching
mechanism must also be removed. There should not be any change in the manual
transmission, except for its shifter. For further simplicity the shifter can be
replaced with a switch, so that the forward and backward motion of the car can
be controlled automatically. Connect the motor to the transmission. For
controlled working of the AC motor, it must be connected to the controller. A
number of lead acid batteries must be connected to the battery tray, which is
correctly installed to the base of the car. For good driving response the
battery must be able to produce at least 300V DC. For this, I would prefer two
slots of the battery tray fitted with 25 batteries. For an ordinary car, the
engine vacuum was used to give power to the bakes. In its absence a vacuum pump
must be installed. Since the only driving source is from motors, the other
mechanisms like power steering, water pump and also air conditioner should be
connected to separate motors. Earlier they had driven power from the gasoline
engine itself. As a part of maintenance, it is always better to include a
recharger, so that the batteries can be automatically charged. For this, a 240V
outlet is preferred.
Electric Car Statistics
Different parameters like
mileage, speed, and life define the ability of a car. Here is an average
reading of an electric car.
§ The car
has a maximum speed of 80km.
§ The batteries
have a life of almost three and a half to four years.
§ All the
batteries included weighs almost 500 kilograms.
§ After a
long drive, almost 12KW/h of electricity is needed to charge the car.
When comparing these
parameters to an ordinary petrol/diesel car, you will get a huge difference in
the pricing. There is almost 30% difference in the expense for each kilometre.
But, the initial cost for an electric car will be very high. The batteries
itself will cost up to $2000. They will last for a minimum of 25,000 miles.
Working of an Electric Car
An electric car simply consists of three main components –
Battery, controller and electric motor.
The base of any car is the battery. As told earlier, the battery
used for this car is very expensive. By using lead acid batteries, the weight
of the car increases a lot (>>1000 pounds). As the number of batteries
range from 50 to more, they occupy a lot of space as well. They generate lesser
driving powers comparing to gasoline cars. After a long drive, they need at
least ten hours to get recharged completely. Apart from the battery used for
the car mechanism, there is also an additional 12 V battery on board. This is
needed to provide power for other components like wipers, radio, and air
conditioner and so on. But the extra expense comes when you have to recharge
the battery. You will need a 300V Dc to 12V DC converter.
As told earlier we need 300V DC to drive the AC motor. This
rating is converted to 240V AC and is sent to the motor with the help of the
converter. This can only be done using a set of transistors, which will
convert the DC signal into sine waves rapidly. Thus when the accelerator is
fully pressed, the controller produces almost 96 V to the motor. If the
accelerator is released, the controller delivers 0V. Thus the controller stands
as a buyer of power from the battery and giver of power to the motor. As the
accelerator is pressed in different modes, the controller is supposed to give
an output power accordingly. So, variable potentiometers are connected between
the accelerator and the controller, so that variable, but proportional power
can be delivered to the motor. But, if the potentiometer goes wrong the result
can be fatal. So, as a safety measure, there are two potentiometers connected
to the accelerator. If both show equal value, then the controller proceeds. If
they are different, the controller stops working. The greatest disadvantage of
this is that the whole car stops working if a single potentiometer goes wrong.
In most of the cars, the controller is just a normal switch with an ON position
while accelerating and an OFF position while decelerating. But, this is
difficult for the driver as he will not get a flow. Thus the controller acts as
a pulsator. It notices the value of potentiometer and rapidly switches the
proportional power to the motor.
The motors used in electric cars can be AC or DC. Mostly DC
motors are preferred than AC motors because they are simple to configure and
are not at all expensive. For AC motors 3-phase motors have to be used, running
at 240V AC. DC motors, on the other hand requires only (96-192)Volts. DC motors
can also be overdriven for a short period of time.
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