final ppt 6june

D. Y. Patil College of Engineering, Akurdi Department of Mechanical Engineering

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DESIGN & FABRICATION OF ELECTRIC BICYCLE

PRESENTED BY:-Birhade Vilas Deore Ashok Solunke Vishal Khedkar Dhananjay

GUIDED BY:-Prof. Swapnil Ghogardare


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1. INTRODUCTION:

An electric bicycle is an ordinary bicycle fitted with a rechargeable battery pack and a motor. However, there are a number of features that make it different from a normal bicycle.

In some models, the motor does not work without pedaling, while in others the motor can be used exclusively to power the bicycle.

Range of speed 18-25 kmph


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PROBLEM STATEMENT

• To reduce the complexity, cost and friction generated during working of electrical bicycle.

• To give power on demand to the bicycle with very efficient manner & reduces pollution


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AIM AND OBJECTIVES

To minimize traffic problem and pollution problems.

To minimize power losses in chain drive due to friction.

To generate eco-friendly two wheeler vehicle.

To generate electrical bicycle with optimum cost.

To design compact bicycle.

Reduce effort of Rider.


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Connection diagram of e-bicycle :


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COMPONENTS OF E-BICYCLE•Conventional bicycle•Motor (D.C.)•Battery• Battery Charger•Sprocket•Chain Drive•Controller •Throttle •Mounting Plate•Head Light, Lock and Indicator•Solar Panel & Solar controller


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1.Conventional Geared Bicycle

•Shifting mechanism for speed selection•Multiple number of speed obtain•Less effort is required when high slope•User friendly for riding •High mechanical advantage


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2.Motor (D.C)

•Type : DC motor•Longer life than other type of DC motor•Working is similar to conventional DC motor


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Working of DC motor

• work on principle of electromagnetic induction•Magnitude of force: F= B*I *L Newton; where, The original flux density, B Current flowing through conductor, I Length of conductor, L


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Motor Specifications: -

Power: 350W; Voltage: 24V; Current: 15A; RPM: 300; Overall length: 0.23m; Mass: 1.5Kg


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3.Battery (Lead acid battery)

•Highest energy density to weight ratio •Provide clean energy source to motor•No fire hazard unlike fuel operated •Eliminates the need for periodic care for a long life•Reliable operation


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Specifications of battery: -

Type: Lead acid type Rated voltage: 12V Rated current: 12Ah Number of batteries: 2 Battery Rating = 12 V * 12Ah = 144Wper nos.


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4.Battery charger

•Design to fulfill the battery charging requirement•Operates in wide AC input range(90-240 V AC)•Designed with high frequency switching technology•Highly reliable, cost effective•Compact in size and light in weight


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Specification of battery charger

Model No: LT01 Input: 90-240v, 50/60Hz Output: 24v Current Rating: 1.6A -2.0 A


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5.Sprocket :

•It is a profile wheel with teeth•Transfer motor motion to wheel sprocket by chain•Having maximum efficiency than belt drive•No slip between sprocket and chain


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Specification of motor sprocket: - Number of Teeth= 9; Diameter= 40mm Speed =300rpm

5.1 Motor sprocket


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Specification: -

Number of Teeth=18; Diameter=80mm Speed =150rpm

5.2 Axle sprocket :


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6.Chain Drive:

•Consists of an endless chain wrapped around the two sprocket•Series of link connected by pin joints•Alternate link made of inner and outer link plates.•Roller chain consist of: Pin, Bushing Roller ,Inner link plate and Outer link plate


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6.1 Why chain drive is selected?•A chain drive doesn’t slip and to that extent, chain drive is a positive drive.•Chain drive have small overall dimension then belt drives, resulting in compact unit.•This drive mostly preferred for “short distance”, whereas geared drive will required additional idler gear.•The efficiency of chain drive is high for properly lubricated chain. The efficiency of chain drive is from 96-98%.•Chain drive doesn’t require initial tension. Therefore, the force acting on shaft is reduced.•Chain are easy to replace.


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7.Controller

•controller makes sure everything run smoothly•Throttle, motor and battery all connect to controller•The core function of DC motor controller is to periodically read the throttle setting• Adjust the current being supplied to the motor.


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Connection diagram of controller :


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8.Throttle :

•It is designed to be operated by the thumb•Throttle is the physical connection between rider and E-bicycle•Magical bond is formed between rider and bicycle•There are three main type of throttle: Thumb throttle Half twist throttle Full twist throttle


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9. Mounting plate:

• It is a specially Generated plate to mounting motor on rear wheel.• It carry the weight of motor (w=1.5kg).it is made up of mild steel

210N/mm2 .• Which has capacity to sustain &support motor from heavy shock.


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10.Head light, lock & indicator

• The e-bicycle head light will make our daily ride safer and more secure

• it will make you highly visible to others on roads or paths, as well as eliminate your way through darkness


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IndicatorIndicator indicates the range of speed which is proportional to throttle.LockIt blocks the controller and stop the motor.


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11.Catia drawing of electrical bicycle(old concept)


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Catia drawing of electrical bicycle (New implementation)


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12.FRAME ANALYSIS [APDL ANSYS]


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13.calculation

Components Mass in kg

Bicycle and assembly 15

Battery and battery mounting 9

Motor and sprocket 2

Cyclist 80

Total 106


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Let,

F = propulsion force

m = total mass

α = surface angle=2.450(assumed)

v = bicycle speed=20km/h

a) Propulsion force,

F = m*sinα; kg

=106*sin (2.45) *9.8

=44.575N


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b) Required power

P = F * v

= 44.575*20*5/18

=247.64 W

Hence the power required by motor to propel the bicycle and rider is

approx. 250W.Hence we need motor of 250w capacity.


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c) Torque calculation

Specification of motor

250W; 300rpm; 24 volt

Torque at motor shaft

P= 2πNT/60; watt

T= 250*60/(2π*300)

=7.957Nm


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d) Current required to drive motor

P= V*I

I= 250/24= 10.416 amp

f) Gear reduction ratio

G= Z2/Z1 = 18/9 =2

g) Speed at rear wheel shaft

G=N1/N2 = Z2/Z1

N2= 300*9/18

= 150 rpm


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h) Output torque T2 = 7.957*300/150

=15.914Nm

i) Speed of Rear Wheel, V= r*w

Radius of rear wheel r =330mm (standard)

=N2= 150 rpm

V= 330*2π*150/60000= 5.183 m/s

=5.183*18/5

= 18.66 kmph


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CALCULATIONS OF BATTERY

Charging time= battery AH rating /current rating

Output current from charger = 1.8A

So, charging time for a battery =12AH /1.8 = 6.666hrPercent of charge Discharge time in hrs

10 0.1220 0.2430 0.3740 0.4950 0.6160 0.7370 0.8680 0.9890 1.08

100 1.22

Table no.3: %charging vs discharge time


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14.CostingSr.no Components Cost Quantity

1 Bicycle 4000 1

2 D.C. 3350 1

3 Battery 2900 2

4 Controller 1000 1

5 Solar Panel 10w 800 1

6 Solar panel charger 450 1

7. Mounting plate 300 1

8. Rear Hub 200 1

9 Rear sprocket 40 1

10 Chain drive 20 1

11 Studs 60 8

12 Wire cable 50 2

13 Battery carriage 100 1

14 Battery charger 300 1

15 Other expenses 500 -

16 Total 14,070/-


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15.Future scope :

• In future every one should move towards clean energy to save the conventional fossil fuels i.e. petrol, diesel etc.

• It reduces traffic problem• Reduces pollution problem• Reduces the dependency on conventional

energy sources& drought• By using solar energy we can reduce

dependency on conventional sources.


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16.Conclusion• It is clearly seen that e-bicycle is economical ensure and cleaner

vehicle, also the solution of energy crisis. People use fuel bike vehicle for short distances instead of that we use e-bicycles. Hence it is essential to encourage more people to use e-bicycle.


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REFERENCES[1]. Muetze A, Tan Y C (2005), Performance evaluation of electric bicycles, Industry Applications Conference, Vol. 4, pp: 2865 – 2872.[2]. Thiyagarajan V, Sekar V, Controlling of brushless DC motors in electric bicycles using electronic based circuit with 8-bit microcontroller, International Journal ofEngineering Sciences & Emerging Technologies, Dec. 2012, Volume 4, Issue 1, pp: 26-34.[3]. Oman H, Morchin W C, Jamerson F E (1995), Electric-bicycle propulsion power, Microelectronics Communications Technology Producing Quality Products Mobile andPortable Power Emerging Technologies, p 555.[4]. Boccaletti C, Duni G, Petrucci P, Santini E, Design of an electrical drive for motorized bicycles, Department of Electrical Engineering, University of Rome "La Sapienza",Italy.[5]. McLoughlin I V, et al., Campus Mobility for the Future: The Electric Bicycle, Journal of Transportation Technologies, Jan 2012, pp: 1-12.


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THANK YOU…!!!

final ppt 6june

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