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Project Report

1. 1. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 1 INTRODUCTION The world's car usage is booming. Cars are polluting the world's cities, dumping increasing amounts of carbon dioxide and other climate-altering greenhouse gasses into the atmosphere, and consuming vast quantities of petroleum. The alarming reality is that the automobile usage is growing at a much faster rate than the human population, with saturation nowhere in sight. If present trends continue, over 3 billion vehicles could be in operation by the year 2050, exceeding 20 cars per 100 people. Even then, world car ownership rates would fall far short of current U.S. rates of 70 cars per 100 people. Nowadays, the price of oil keeps on increasing. People want to use electricity instead of oil to operate transport. In China, the industry of electric bikes has grown rapidly in these 10 years. The design of electric bikes trends to more environmentally friendly. The energy from the sun can be used to run electronic devices. In this project, a electric powered bicycle was designed. The materials used are more environmentally friendly and the cost is much lower than the existing electric powered bike. The maximum speed of the bike is 20km/hr. The charging time by using electricity is 2-3 hours and 4-6 hours by using solar energy. The design fulfills the requirements of China's government. Also, our target market is China. We have analyzed the market for of electric bikes to understand the needs of its citizens. The target customers want to have an electric bike with a light weight and don't need to recharge frequently. They also care about the safety of the bike. Project Background A method of upgrades a conventional electric powered bicycle over to Solar-Powered Electrical Bicycle that is powered by an electric motor which gets its supply from photovoltaic (PV) panels. The PV panels must be mounted and installed at the bicycle without compromising riding comfort ability. The method employs a small electric motor that are easily connected and separated for ease of transport. A solar collector is connected to the rechargeable batteries for collecting solar energy and converting such energy to electrical power that is delivered to the rechargeable batteries for recharging thereof. A
2. 2. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 2 rechargeable battery is operable connected to DC motor for providing electrical power to drive the motor. Problem Statement There are several problems that occur during upgrades a conventional electric powered bicycle to Solar-Powered Electrical Bicycle. The specifications of photovoltaic (PV) panels must be sufficient to generate the electric motor same as a conventional electric powered bicycle. The suitable connection of solar cells, rechargeable battery and DC electric motor with bicycle needed to make sure this project accomplish with more optimum energy use. The electric motor must to support the weight and size of the bicycle, size of solar panel and condition of the road surface.
3. 3. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 3 Literature Review This chapter will be stressed on the literature review of related system. The main purpose of this chapter is to analyse, identify and make conclusion based on the research. A literature review means a collecting related data, analysed business process, identify underlying patterns and create the conclusion. Another description of the literature review is a systematic, explicit and reproducible method to identifying, evaluating and synthesizing the existing body of completed and recorded work produced by researcher, scholars and practitioners. In order to develop a successful project, the current systems are identified. The system of conventional electric powered bicycle, solar system and its connection have been analysed. Studies of these systems are significant to develop a valid, reliable and efficient upgrade project. The Literature Review part acts as a mean to discover which methodology should be chosen in developing this system. Facts and Findings Facts and findings establishes what the existing system does and what the problems are, and leads to a definition of a set of options from which users may choose their required system. This section will be discussing about the domain of this project, the existing system and finally the other techniques that applicable to be used while developing this project. It focused on the how to design and develop the project systematically according to the requirement of minimize the functional of conventional project. In the other situation, these will be describing any element or method which is useful to be used for the purpose of searching and gathered useful information in developing this project. Domain Currently, electric powered bicycle that was studied for this project only uses a battery to get the electric powered supply by recharge it using conventional way. Electric powered bicycle only depends on power that charge in battery to make it functions unless using the manual way to move it. The project is wanted to change the way a battery charge to get the electric power and generate electricity to move the bicycle with optimum energy.
4. 4. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 4 Solar Power Solar cells (really called "photovoltaic" or "photoelectric" cells) that convert light directly into electricity, bypassing thermodynamic cycles and mechanical generators. PV stands for photo (light) and voltaic (electricity), whereby sunlight photons free electrons from common silicon. A photovoltaic module is composed of individual PV cells. This crystalline-silicon module has an aluminium frame and glass on the front. In the field of photovoltaic, a photovoltaic module is a packaged interconnected assembly of photovoltaic cells, also known as solar cells. An installation of photovoltaic modules or panels is known as a photovoltaic array or a solar panel. A photovoltaic installation typically includes an array of photovoltaic modules or panels, an inverter, batteries (for off grid) and interconnection wiring. Solar energy is the utilization of the radiation energy from the sun. Solar power is used interchangeably with solar energy but refers more specifically to the conversion of sunlight into electricity by photovoltaic and concentrating solar thermal devices, or by one of several experimental technologies such as thermoelectric converters, solar chimneys and solar ponds. Sunlight is composed of photons, or particles of solar energy. These photons contain various amounts of energy corresponding to the different wavelengths of the solar spectrum. When photons strike a photovoltaic cell, they may be reflected, pass right through, or be absorbed. Only the absorbed photons provide energy to generate electricity. When enough sunlight (energy) is absorbed by the material (a semiconductor), electrons are dislodged from the material's atoms. Special treatment of the material surface during manufacturing makes the front surface of the cell more receptive to free electrons, so the electrons naturally migrate to the surface. When the electrons leave their position, holes are formed. When many electrons, each carrying a negative charge, travel toward the front surface of the cell, the resulting imbalance of charge between the cell's front and back surfaces creates a voltage potential like the negative and positive terminals of a battery. When the two surfaces are connected through an external load, electricity flows.
5. 5. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 5 Electric Powered Bicycle An electric powered bicycle carries batteries or fuel cells that deliver electric power to a motor that is coupled to either wheel. In most electric bicycles the rider can choose to use muscle power to deliver all, part, or none of the propulsion power required to maintain his or her adopted travel speed. Some models even sense your pedal pressure and command the motor to deliver more power whenever you pedal hard. Many electric powered bicycles are specifically design and build for travel. Average travel speed, when compared to pedalled-only bicycles, can be increased by 8 to 10km/h (5 to 6 mph) above the speed an average person could travel by pedalling. Previous Project Early 2001, David Clay was built a solar-electric bicycle. On this solar and human powered rig, he rode from San Francisco, California, to Carbondale, Colorado, arriving just in time to start a summer of classes at Solar Energy International. In the summer of 2001, he went to China, and continued solar cycling around the world. The trip was also the ultimate test for developing the solar cycle. He realized that the bicycle needed a stronger PV mount after 30 miles traveling. Next, brakes needed for the trailer after 100 miles and after 1,000 miles the trailer needed with a spoke wheels. After 1,500 miles, powerful motor need to cover the performance of bicycle that remains constantly. Performance of the bicycle is produce by a 24V DC system. 4 to 5 A can be produce in full sun by the array of four Solarex MSX Lite modules. His trailer weighs 190 pounds (86kg) empty, and he pulled an additional 85 to 100 pounds (39–45 kg) of gear. He can cruise on the flat ground at 18 mph (29kph) without pedalling, with the motor drawing 13 amps. He then tested the range of the bike on flat ground, with an unloaded trailer and a 150 pound (68 kg) rider, from full battery to empty battery (100% SOC to 20% SOC). It can cruise in range of 25 to 30 miles (40–50 km) without pedalling and sunshine. The range is increase to 35 to 40 miles (55–65 km) when it cruises with a pedalling and sunshine. When pedalling, the rider‟s fitness level becomes the only limit.
6. 6. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 6 THEORY DEFINITION: This project is a way of using the outgoing power and producing both from wind generator and solar panel. This project consists of a rechargeable battery pack which powers a light weighted motor unit over the wheel. The solar electric bicycle approach is different. It works in normal day as well as in cloudy day. EXPLANATION: A solar electric bicycle is an electric vehicle powered completely or significantly by direct solar energy. Usually, photovoltaic (PV) cells contained in solar panels convert the sun's energy directly into electric energy. The term "solar vehicle" usually implies that solar energy is used to power all or part of a vehicle's propulsion. Solar power may be also used to provide power for communications or controls or other auxiliary functions. In this project we are using a prototype DC fan as wind generator which helps it to work in cloudy day also. Rechargeable battery is used with long life for charging. DC electric motor is also used in this project. An electric motor converts electrical energy into mechanical energy. Most electric motors operate through the interaction of magnetic fields and current-carrying conductors to generate force. The electricity generated by the solar panel is stored in the battery, enabling a rider to switch over the operation to hybrid mode anytime and control the speed of the bicycle using the accelerator. Many large metropolitan areas have implemented bicycle sharing systems to encourage the eco-friendly form of transportation while minimizing traffic log-jams. Two mode biking options: 1. Only pedal power. 2. All electric power (No pedal option). When fully implemented, the system will operate with modular stations throughout the city – much like transit stations. These stations are 100% solar powered. Solar panels absorb UV light and convert it to clean electricity which is then used to recharge the bicycle's battery. Riding bicycles is already an eco-friendly way to commute.
7. 7. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 7 CONSTRUCTION DETAILS It used high quality parts. Not cheap, but our new mountain bike cost more than that and you have to pedal it. You can get a turn-key electric motor kit, or a readymade e-bike for, but of course the motors and batteries are all only 1/3 as powerful as this. Weight – At 85 pounds, this is pretty heavy for a "bicycle," but I think of it more as an ultralight moped. And it is a true "mo-ped" in that you can still meaningfully pedal it. Plus I can still lift it into my pickup or my car trunk if needed. Our old Peugeot moped weighed twice as much at 150 pounds with similar speed capability, and pedalling it was a joke - the pedals were geared really low, purely for starting the motor. Brakes – The old brakes on this bike were okay for 12 mph but hair-raising at 30 mph. A new side pull "vee brake" as used on decent Modern Mountain bikes luckily bolted right onto the old brake mount posts. Regular bicycles are too light and top heavy to use the front brake as the main squeeze, but as any motorcyclist can tell you, on any heavier two wheeler the front brake does 90% of the work. The vee-brake kit was about 25 bucks on sale at a bike dealer, and came with a new lever for the handle bar. I only replaced the front brake, as the rear posts are in the wrong place. A number of people have written to ask me where the rear brake is – it looks like there is no rear brake at all. Frame – The components can take the added force and weight of the motor system. Mountain bike components now are amazingly strong and durable - they are made to take off-road abuse. The wider wheels especially are much better for the additional weight and power. Also, a steel frame is easier to weld or braze motor and battery mounts onto. Stay away from aluminium unless you can figure a way to bolt or clamp everything on without welding. Welding onto an aluminium frame will likely ruin the tempering and severely weaken it. It's quite difficult to weld on thin aluminium. The peculiar geometry of the GT rear frame design actually makes a perfect place for the motor.
8. 8. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 8 Construction – We have to weld a motor mount onto the rear frame behind the seat. The chain just clears the wheel and frame and it was critical to get the motor solidly mounted. With such a powerful motor, the motor mount must be strong, and it's really pretty important to have a ball-bearing motor. The motor mount is removable from the frame with three allen head screws. We have a TIG welder and lots of metal working tools so it was not a big deal for me but we don't see why all this couldn't be done on a steel bike frame with silver solder or brazing rod and a gas torch. The batteries also have a very solid welded-on mount with a screw-down top retaining rail. The batteries are heavy and need a good solid mount with shock padding. These batteries are narrow and don't interfere at all with pedalling. In this arrangement they are also low and keep the centre of gravity down.
9. 9. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 9 PARTS OF THE ELECTRIC BICYCLE 1. Battery 2. D.C. Electric motor 3. A speed controller or motor controller 4. V Brake 5. Thumb Throttle 6. Battery Charger 1. BATTERY In this project we are using LEAD ACID BATTERIES. There are 2 LA batteries of 12V each. Lead acid batteries, invented in 1859 by French physicist Galstron Plante, are the oldest type of rechargeable battery. Despite having a very low energy-to-weight ratio and a low energy-to-volume ratio, their ability to supply high surge currents means that the cells maintain a relatively large power-to-weight ratio. These features, along with their low cost, make them attractive for use in motor vehicles to provide the high current required by automobile starter motors. Batteries use a chemical reaction to do work on charge and produce a voltage between their output terminals. Charging and discharging the battery: The reaction of lead and lead oxide with the sulphuric acid electrolyte produces a voltage. The supplying of energy to and external resistance discharges the battery. The discharge reaction can be reversed by applying a voltage from a charging source.
10. 10. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 1 0 2. DC ELECTRIC MOTOR: An electric motor converts electrical energy into mechanical energy. A 180W brush type DC motor is used in solar electric bicycle. A brushed DC motor is an internally commutated electric motor designed to be run from a direct current power source. PRINCIPLE OF OPERATION: The construction of a simple BDC motor is shown in Figure. All BDC motors are made of the same basic components: a stator, rotor, brushes and a commutator. Stator: The stator generates a stationary magnetic field that surrounds the rotor. This field is generated by either permanent magnets or electromagnetic windings. The different types of BDC motors are distinguished by the construction of the stator or the way the electromagnetic windings are connected to the power source. Rotor: The rotor, also called the armature, is made up of one or more windings. When these windings are energized they produce a magnetic field. The magnetic poles of this rotor field will be attracted to the opposite poles generated by the stator, causing the rotor to turn. As the motor turns, the windings are constantly being energized in a different sequence so that the magnetic poles generated by the rotor do not overrun the poles generated in the stator. This switching of the field in the rotor windings is called commutation. Brushes and Commutator: Unlike other electric motor types (i.e., brushless DC, AC induction), BDC motors do not require a controller to switch current in the motor windings. Instead, the commutation of the windings of a BDC motor is done mechanically. A segmented copper sleeve, called a commutator, resides on the axle of a BDC motor. As the motor turns, carbon brushes slide over the commutator, coming in contact with different segments of the commutator. The segments are attached to different rotor windings; therefore, a dynamic magnetic field is generated inside the motor when a voltage is applied across the brushes of the motor. It is important to note that
11. 11. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 1 1 the brushes and commutator are the parts of a BDC motor that are most prone to wear because they are sliding past each other. Examples of brush-type DC motor operations: Figure shows an example of controlling the speed of a brush-type DC motor using a PWM waveform. These operations are outlined below:  When the duty cycle changes, the interval between on and off of the transistor changes and the average current supplied to the motor also changes. When this average current changes, the motor rotation speed also changes.  When the duty cycle of the PWM waveform is 50%, the motor rotates with 50% output.  When the duty cycle of the PWM waveform is 75%, the motor rotates with 75% output.  When the duty cycle of the PWM waveform is 100%, the motor rotates with 100% output (at full speed). 3. SPEED CONTROL: The speed of a BDC motor is proportional to the voltage applied to the motor. When using digital control, a pulse-width modulated (PWM) signal is used to generate an average voltage. The motor winding acts as a low pass filter so a PWM waveform of sufficient frequency will generate a stable current in the motor winding. The relation between average voltage, the supply voltage, and duty cycle is given by: EQUATION 1: Vaverage = D x Vsupply Speed and duty cycle are proportional to one another. For example, if a BDC motor is rated to turn at 15000 RPM at 12V, the motor will (ideally) turn at 7500 RPM when a 50% duty cycle waveform is applied across the motor. The frequency of the PWM waveform is an important consideration. Too low a frequency will result in a noisy motor at low speeds and sluggish response to changes in duty cycle. Too high a frequency lessens the efficiency of the system due to switching losses in the switching devices. A good rule of thumb is to modulate the input waveform at a frequency in the range
12. 12. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 1 2 of 4 kHz to 20 kHz. This range is high enough that audible motor noise is attenuated and the switching losses present in the MOSFETs (or BJTs) are negligible. Generally, it is a good idea to experiment with the PWM frequency for a given motor to find a satisfactory frequency. The CCP module (short for Capture Compare and PWM) is capable of outputting a 10-bit resolution PWM waveform on a single I/O pin. 10-bit resolution means that 210, or 1024, possible duty cycle values ranging from 0% to 100% are achievable by the module. The advantage to using this module is that it automatically generates a PWM signal on an I/O pin which frees up processor time for doing other things. The CCP module only requires that the developer configure the parameters of the module. Configuring the module includes setting the frequency and duty cycle registers. Brushed DC motors are very simple to use and control, which makes them a short design-in item. 4. V BRAKES: A bicycle brake is used to slow down or stop a bicycle. V-brakes are a side-pull version of cantilever brakes and mount on the same frame bosses. However, the arms are longer, with the cable housing attached to one arm and the cable to the other. As the cable pulls against the housing the arms are drawn together. Because the housing enters from vertically above one arm yet force must be transmitted laterally between arms, the flexible housing is extended by a rigid tube with a 90° bend known as the "noodle". The noodle seats in a stirrup attached to the arm. A flexible bellows often covers the exposed cable. 5. THUMB THROTTLE: This solar electric bicycle thumb throttle is easy to use and great for those that want to keep their original handlebar grip. Typically the thumb throttle is used on bikes that have a twist gear changing system. That said it comes down to personal choice as the thumb throttle can also be used on a bike that has a thumb gear changing system. A "Thumb Throttle" refers to a method of controlling the speed of an engine or motor. A thumb throttle is located on the right side of the handle bar and is a small lever on under side of the handle bar that is operated by pushing inwards with your thumb.
13. 13. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 1 3 When you push your thumb in you are increasing the engine speed (going faster). When you bring your thumb back towards you (or let go of the throttle and let the springs return it), it slows the engine down. 6. CHARGER: In this project we have used a 220V AC, 50Hz, and 1.0A Charger with the following specifications: INPUT : 180 – 300 V AC, 47 – 63 Hz OUTPUT : 29.4 V DC, 2.0 A FLOAT : 27.4 V DC ± 0.4 V BOOST : 29.4 V DC ± 0.4 V
14. 14. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 1 4 ADVANTAGES  Commuting with low fatigue at a top speed of 24 kmph.  Extends the riding range – 30kms on a single charge.  Lesser maintenance cost.  Normal pedalling is possible when not on power assist mode.  Detachable battery can be taken inside the house for charging.  Thumb throttle - simple to operate and less strain on hands.  Solar panels keep charging the batteries for our continuous use.  The fan produce electricity and hence the battery is charged.  No noise - no vibration - no smog - no smog checks.  No registration - no insurance – no driver's license  No gasoline - no oil - no tune-ups.  No parking hassles - no car payments - no more exercise (use the pedals) - no brainer All spare part of new bicycle can be ordered or replaced with spare parts that are available in market. Solar electric bicycle can be charged from home electricity as well as wind generator when there is less sunlight.
15. 15. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 1 5 DISADVANTAGES  High centre of gravity.  More wind load.. REMEDY: In the ideal situation of the absence of side wind and where the panel is horizontal to the wind, the air drag of the PV panel is quite low. The skin friction drag is negligible with air. The shape should be aerodynamic.
16. 16. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 1 6 FUTURE WORKS The design and fabrication completed on this project will be done in second semester. We will manufacture a required component, support, Bearing cap, pulley, selection of sprocket wheel, for the making of Electric bicycle. We will collect standard parts required for our project. We will make the assembly of the Electric bicycle with minimum space as the new machine takes. We will taking continuous effort to project work as to be 100% succession.
17. 17. ELECTRIC BICYCLE DESIGN S.S.G.B.C.O.E.T. 1 7 CONCLUSION During this semesters the electric bicycle project has provided an opportunity to grasp the full scope of what it means to Design a product. This opportunity allowed an initial idea/goal to be realized in a team environment. The idea developed as research and various other information on the topic was obtained. The project evolved and changed as the team limitations and financial constraints were realized. Due to a lack of funding, the initial design of an electric go-cart was downsized to the current project, the electric assisted bicycle. The initial design, of the electric assisted bicycle, carried along with it constraints that had to be worked around. The constraints were mainly financial in nature. They represent pieces of equipment in the design that had to be carried over from other semesters. The constraints on the equipment consisted of the battery, motor, and the bicycle frame. The motor bicycle relationship could not be altered, mainly due to the type of mounting on the motor. These constraints limited, but did not totally restrict the team's ability to design a "new" system. Once all constraints were known, the goals for the design were clearly identified. The goals were divided among the team members. In order to meet the deadline for the final project, progress was monitored weekly and individual goals were readjusted as needed. With communication between the team, and hard work, the final objective was obtained. The design project provided the team with valuable experience in design and teamwork. It allowed the team members to develop skills that will be useful in future endeavours.

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