PowerPoint Presentation On Electric Scooter

Electric Scooter PPT

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Electric Scooter Presentation Transcript:

1. INTRODUCTION
In the simulation and modeling of electric scooter we replace the D.C. motor by a single phase induction motor,this makes it low cost and less maintenance and more impressive. The electric scooter of 0.26 KW rating was employed for test. As a result, a single phase induction motor showed ability to drive an electric scooter with 80 kg load at almost constant speed of 20 kph.

2. PRINCIPLE OF AN ELECTRIC SCOOTER
In this system, a dedicated DC/DC converter connected to the grid charges the batteries. Than another DC/DC converter is used to convert the battery voltage to a suitable voltage for the DC motor.

3. SIMULATION OF ELECTRIC SCOOTER
A whole system simulation of an electric scooter drive system consist of three main parts Power supply interface Battery storage Power electronic interface Motor drive performance Electric vehicle movement simulation

4. POWER SUPPLY INTERFACE
Battery is vital to energize overall energy to the entire system. A simple battery model can be represented by a Thevenin’s equivalent circuit. V=E-IR0

5. BATTERY MODEL
The model represents the nonlinear characteristics of the battery. R1:-plate internal resistance D1,D2:-hysteresis and non linear internal resistance effects in the electrochemical cell D3:-charge leakage C1:-linear capacitive storage elements across the double layers C2:-chemical reaction storage

6. Example:- A model of Ni-Cd In this model the system voltage,312 volt, consists of 228 series connected cells.

7. BATTERY EQUALIZATION
Typical charge profiles published for rechargable batteries,particularly large lead-acid batteries used in electric vehicles,are designed to accomplish two goals.Obviously they deliver the energy that is stored in the individual cells.Less well recognized is that the preferred charge profiles overcharge the cells to force equalization.

8. TYPICAL BATTERY STACKS
Lead acid batteries are typically sold in 6v or 12v monoblocks. By proper choice of capacitors,MOSFETS and switching frequency,the equalizers ensures that no cell voltage ever strays from the mean.

9. PASSIVE EQUALIZATION
It has been found that allowing a 12v battery to float at its termination voltage for some period of time will equalize the relative chemical states.This is referred to as “PASSIVE EQUALIZATION”

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