New electric bike project 2016

                     NEW ELECTRIC BIKE PROJECT 2016

DESIGN AND IMPLEMENTATION OF A novel power scrambler FOR IMPROVING FUEL EFFICIENCY.

Abstract

To meet the challenges of constantly rising fuel supplies, a new power scrambler with high efficiency is designed by increasing the kilometre range. In all kind of bikes, mechanical energy is produced in the front wheel during roving. In this paper, a technique is proposed to utilize the mechanical energy by using an alternator for conversion. Alternator is placed in the front wheel of power scrambler which converts the mechanical energy into electrical energy. Various power electronics circuits are intended, to utilize the produced energy for charging the battery in the power scrambler. This helps in increase the efficiency of the power scrambler. For instance if 10:1:5 is the kilometre ratio of the electric bike, with the use of the alternator, the kilometre will be decreased by the ratio 10:1. But subsequent to its connection to the charging system, the kilometre is increased by the ratio 10:5. The main objective of this paper is to increase the usage of the electric bike, since this will reduce the usage of the extinct fuels.

Keywords: Power scrambler (electric bike), BLDC motor, DC-DC boost converter, Lead-acid battery.

INTRODUCTION

BLOCK DIAGRAM OF OUR PROJECT

In this block diagram, there are two blocks one is the existing system, which is already in the e-bike and another one is the new system, which we are implementing in the new power scrambler. In the existing system, battery is charged by using the wall-charger. Then the control unit is provided to control the overcharging of the battery and to separate the supply for head light and indicator light and also used to convert the DC to 3 phase AC for providing supply to the BLDC motor in the back wheel of e-bike. In our project, we are placing the alternator in the front wheel, it will convert the mechanical energy into electrical energy.

PROJECT DESINGNING REQUIREMENTS

CIRCUIT DIAGRAM

This is the DC-DC boost converter circuit used in our project, for boosting up the output voltage of the alternator. We are getting the 12 voltage output from the alternator. This voltage is not sufficient for charging the batterybecause the charging voltage of the battery is 48v. So the circuit is used in our project.

 Normally, the process of DC-DC boost converter consists of three stages. First by using the inverter we are converting DCinto AC. Next the AC is boosted up to the required voltage and finally AC is converted into DC by using the rectifier. Here, 7812 and 7805 are the two regulating IC’s used for providing the supply to the switching regulator. IR 2112 is the switching regulator and PIC 16F877 is the microcontroller respectively.PIC 16F877 is used to generate the pulse for IR 2112. By using this pulse, IR 2112 will switch the MOSFET fast. Due to this, the DC is converted into AC. Then the inductor is used to boosting up the AC voltage. After that, by using the rectifier circuit, we are converting into DC.

                                   

ALTERNATOR

                             

In the front wheel of the e-bike, BLDC motor was used as an alternator in this project. Because the motor was used in all type of e-bikes in the back wheel. The field of an alternator is permanent magnet. So it does not need supply but it will produce emf(electro motive force) and also the motor will be compact in size for placing in front wheel.

PROJECT DESCRIPTION

In all kind of bikes, mechanical energy is produced in the front wheel during the travelling time but it is not utilised. In our project, we are placing the alternator in the front wheel. An alternator will convert mechanical energy in to electrical energy. From that alternator, we are obtaining the output voltage varying from 0-30v. for our convenience, we are making the voltage constant of 12v by using the zener diode. But the 12v is not sufficient to charge the battery. So, we are using the DC-DC boost converter circuit for boosting up the voltage up to 48v for charging the battery.

GRAPH

BATTERY

We are using the 48v sealed lead acid battery. Here, it will be separated in to four 12v batteries because for our size of convenience. Then the four 12v batteries are connected in series.

CONCLUSION

 We are already having the high speed and high load capacity electric bike in the market. E-bike is the pollution free bike but it is not efficiently used due to many reasons. One of the main reason is the lack of kilometre range. So we are improving its efficiency. In near future, fuel may become extinct. So the fuel bikes are not used. At that time an alter method will be needed, so this will be helpful at that time.

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