10-06-2017, 07:10 AM
WIND OPERATED MOBILE CHARGER
Abstract
Wind energy is the kinetic energy associated with the movement of atmospheric air and this energy is converted to more useful forms of power using wind energy systems. It has been used for hundreds of years for sailing, grinding grain and it is being used to generate electric power. Windmills for water pumping have been installed in many countries particularly in the rural areas. The power generation projects contribute to the socio-economic development of the country.
India is now recognized as a leading country in the world in the development and
utilization of renewable energy, in general, and in the development of wind power, in particular. Along with the growth in the Indian economy energy consumption is also increasing to meet the growing demands of the industries.
Power generation from renewable energy sources has assumed significance in the context of environmental hazards posed by the excessive use of fossil fuels. Exploiting an alternate source of energy is the need of the day in view of the increased power demand and depletion of conventional energy resources such as fossil fuel. Also, wind energy generation will save valuable foreign exchange, which otherwise is being used for importing oil for power generation by conventional resources.
Wind can be used to do work. The kinetic energy of the wind can be changed into other forms of energy, either mechanical energy or electrical energy. The wind energy conversion technology functions in the following way. The wind while passing the windmill, converts its velocity with the help of windmill blades into mechanical energy and the mechanical energy is converted into electric power by means of a generator.
Wind power is known as Green Power , because of its technical and commercial viability and its environment-friendly nature. The special features of wind energy that makes it attractive are zero cost fuels, low gestation period, quicker benefits and usefulness for sustainable economic development.
Introduction
Mobile phones are indispensable while you are traveling, especially in a train. However, in India, you will find either no socket for charging mobile in train or you may find just 2 damaged sockets at the end of the compartment, while every passenger carries a mobile these days. So, what to do for charging your mobile while you are inside the train and your battery runs out of power.
The most powerful alternative way is to use the strong wind coming inside through the windows and doors of the train. The outside wind blowing in the earth s frame of reference is almost all the time much slow as compared to the speed of the train which goes up to 100km/hour most of the time. Hence, in the train s frame of reference the pseudo wind which enters the window or passes by the window has nearly the same speed, i.e. 100km/hour or so. A wind with this much speed is strong enough to rotate a wind turbine with high enough rpm and torque, so that even a small wind turbine can rotate a load of small dynamo for charging small batteries. And this can be easily used to recharge your mobile.
The mentioned design uses this wind energy and converts it into useable power, which can be directly feed into the mobile phone or even used for charging a laptop. To accommodate the frequent change in the wind direction, a gyroscopic joint has been given in it. It can be completely disassembled, thereby making it more light in weight and portable, fulfilling its basic function of being a travel charger.
Literature Review
GENERATOR
INDUCTION GENERATOR
An induction generator or asynchronous generator is a type of AC electrical generator that uses the principles of induction motors to produce power. Induction generators operate by mechanically turning their rotor in generator mode, giving negative slip. In most cases, a regular AC asynchronous motor is used as a generator, without any internal modifications.
Principle of operation
Induction generators and motors produce electrical power when their shaft is rotated faster than the synchronous frequency. For a typical four-pole motor (two pairs of poles on stator) operating on a 60 Hz electrical grid, synchronous speed is 1800 rotations per minute. Similar four-pole motor operating on a 50 Hz grid will have synchronous speed equal to 1500 rpm.
In normal motor operation, stator flux rotation is faster than the rotor rotation. This is causing stator flux to induce rotor currents, which create rotor flux with magnetic polarity opposite to stator. In this way, rotor is dragged along behind stator flux, by value equal to slip.
In generator operation, certain prime mover (turbine, engine) is driving the rotor above the synchronous speed. Stator flux still induces currents in the rotor, but since the opposing rotor flux is now cutting the stator coils, active current is produced in stator coils, and motor is now operating as a generator, and sending power back to the electrical grid.