ev with onboard auxiliary charging mechanism

8/2/2019 EV With Onboard Auxiliary Charging Mechanism

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Electric Vehicle With On Board

Auxiliary Charging Mechanism

Tarun Kundu

Saurabh Kapoor


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Need for Electric Vehicle (EV)

Petroleum consumption has steadily increased while

domestic production has continued to decline

World oil production predicted to peak within the next 5-12

years Recent increase in gasoline price is indicator of growing

tension between supply and demand

Compared to conventional internal combustion automobiles

Electric cars have a significant reduction of urban air

pollution as they do not emit harmful tailpipe pollutants from

the onboard source of power at the point of operation.


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Contd.

Another advantage of electric motors is their ability to

provide power at almost any engine speed. Whereas only

20 percent of the energy in a gas car converts to actual,

useable energy, 75 percent or more of the energy from a

battery reaches the wheels.

Significantly less dependence on foreign oil, to power the

economy.


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INTRODUCTION

Electric cars are a variety of Electric Vehicle (EV);

the term "electric vehicle" refers to any vehicle

that uses electric motors for propulsion.

Promoting the use of electric vehicles (EVs) is a key element inmany countries initiatives to transition to a low carbon

Economy.

Recent years have seen rapid innovation within the automotive

industry , with designs such as plug-in hybrid vehicles.


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Our Project

EVs, which have both an electric motor and an internal

combustion engine) and range-extended electric vehicles

(which have an electric motor and an on-board generator

driven by an internal combustion engine) promising to

overcome consumers fear that vehicle will run out of

electricity in the middle of nowhere.


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COMPARISON

Plug-in EVs

Running range is limited

Put strain on local electricity

distribution networks

Quickly discharged

Onboard Charged EVs

Not limited

No such effect on local

electricity distribution

Discharging and charging

takes place simultaneously


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WORKING

Vehicle consists of:

1.Brushless D.C. motor

2.Sealed Lead Acid (Maintenance Free) Battery3.Generator

4.DC Drive


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BRUSHLESS DC MOTOR

The brushless DC motor is the combination of a permanent

excited synchronous motor and a frequency inverter. The

inverter has to replace the commutator of a conventional

DC motor. Fig. show how a brushless DC motor can be

derived from a mechanically commutated DC motor with

three armature slots. Its armature winding corresponds to

a three phase winding in delta connection. The

commutator acts like a three phase frequency converter.

Stator (excitation) and rotor (armature) change places.


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Principle of a permanent magnet excited DC

motor: construction


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BATTERY

Electric vehicle batteries differ from starting, lighting, and

ignition (SLI) batteries because they are designed to give

power over sustained periods of time. Deep cycle batteries

are used instead of SLI batteries for these applications.

Traction batteries must be designed with a high ampere-hour

capacity. Batteries for electric vehicles are characterized by

their relatively high power-to-weight ratio, energy to weight

ratio and energy density; smaller, lighter batteries reduce theweight of the vehicle and improve its performance. Compared

to liquid fuels, all current battery technologies have much

lower specific energy; and this often impacts the maximum

all-electric range of the vehicles.


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GENERATOR

In electricity generation, an electric generator is a device thatconverts mechanical energy to electrical energy. A generatorforces electric charge (usually carried by electrons) to flowthrough an external electrical circuit.

An engine-generatoris the combination of an electricalgenerator and an engine (prime mover) mounted together toform a single piece of self-contained equipment. The enginesused are usually piston engines, but gas turbines can also beused. Many different versions are available - ranging from

very small portable petrol powered sets to large turbineinstallations. .


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DC DRIVE

Adjustable speed drive (ASD) or variable-speeddrive (VSD) describes equipment used to control thespeed of machinery.

DC drives are DC motor speed control systems. Sincethe speed of a DC motor is directly proportional toarmature voltage and inversely proportional tomotor flux (which is a function of field current),either armature voltage or field current can be usedto control speed. The electric motor article alsodescribes electronic speed controls used withvarious types of DC motors


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SPECIFICATIONS

Range/Autonomy : Up to 45 km/charge

Top Speed : 50 Kmph

Weight : 80 Kg (Without Genset and Batteries)

Motor : 1500 Watt 48 Volt, BLDC Motor.

Batteries : 4 x 12V Sealed Lead Acid Maintenance Free Battery

Voltage : 48 V

Charger : Self contained onboard charger

DC Drive Pulse Width Modulation (PWM) type

Brakes: Front & Rear hand brakes.

Wheels : Spoked Wheels.


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Contd.

Generator :

Output: 750 VA

Dry Weight: 28 Kg

Consumption : .7 litre/hour

Continuous Operating Time : 9 hours

Estimated Time to Recharge: 3 hours


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THAN

K YOU

ev with onboard auxiliary charging mechanism

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