19-06-2012, 04:47 PM
Witricity
Witricity.doc (Size: 294.5 KB / Downloads: 65)
INTRODUCTION
The idea of wireless generation and transmission of power is in experiment from a long time. Here, in this paper a method has been tried to develop a proper device that can generate voltages and then transmit them wirelessly through a local network (after that our next stage will be to expand it to global scale) in the RF range for household electricity requirement. Ongoing engineering revolutions going in field of transmission and distribution will help us to make this dream to come in reality. The person first paved the way of dreaming wireless power is NIKOLO TESLA. In 1888 the person developed the principles of his Tesla coil and began working with his ideas for polyphase systems, which would allow transmission of AC electricity over large distances.
Electricity
It is the flow of electrons (current) through a conductor (like a wire), or charges through the atmosphere (like lightning), a convenient way for energy to get from one place to another.
Magnetism
A fundamental force of nature, which causes certain types of materials to attract or repel each other. Permanent magnets, like the ones on your refrigerator and the earth’s magnetic field, are examples of objects having constant magnetic fields. Oscillating magnetic fields vary with time, and can be generated by alternating current (AC) flowing on a wire.
Resonance
Resonance is a property that exists in many different physical systems. It can be thought of as the natural frequency at which energy can most efficiently be added to an oscillating system. A playground swing is an example of an oscillating system involving potential energy and kinetic energy. The child swings back and forth at a rate that is determined by the length of the swing. The child can make the swing go higher if she properly coordinates her arm and leg action with the motion of the swing. The swing is oscillating at its resonant frequency and the simple movements of the child efficiently transfer energy to the system.
HISTORY OF WITRICITY
Tesla’s Vision of a Wireless World
In the late 1800’s and early 1900’s, at the dawn of the electrification of the modern world, some scientists and engineers believed that using wires to transfer electricity from every place it was generated to every place that it could be used would be too expensive to be practical. Nikola Tesla, one of the most well known of these scientists, had a vision for a wireless world in which wireless electric power and communications would reach around the world, delivering information and power to ships at sea, factories, and every home on the planet. Tesla contributed significantly to our understanding of electricity and electrical systems and is credited with inventing three-phase AC power systems, induction motors, fluorescent lamps, radio transmission, and various modes of wireless electric power transfer. WiTricity technology for power transfer is different than the technologies proposed by Tesla, but his work is referenced and acknowledged in the scientific articles published by WiTricity’s founding technical team.
WiTricity Technology
The experimental design consisted of two copper coils, each a self-resonant system. One of the coils, connected to an AC power supply, was the resonant source. The other coil, the resonant capture device, was connected to a 60 watt light bulb. The power source and capture device were suspended in mid-air with nylon thread, at distances that ranged from a few centimeters to over 2.5 meters (8.2 ft). Not only was the light bulb illuminated, but the theoretical predictions of high efficiency over distance were proven experimentally. By placing various objects between the source and capture device, the team demonstrated how the magnetic near field can transfer power through certain materials and around metallic obstacles.
Witricity.doc (Size: 294.5 KB / Downloads: 65)
INTRODUCTION
The idea of wireless generation and transmission of power is in experiment from a long time. Here, in this paper a method has been tried to develop a proper device that can generate voltages and then transmit them wirelessly through a local network (after that our next stage will be to expand it to global scale) in the RF range for household electricity requirement. Ongoing engineering revolutions going in field of transmission and distribution will help us to make this dream to come in reality. The person first paved the way of dreaming wireless power is NIKOLO TESLA. In 1888 the person developed the principles of his Tesla coil and began working with his ideas for polyphase systems, which would allow transmission of AC electricity over large distances.
Electricity
It is the flow of electrons (current) through a conductor (like a wire), or charges through the atmosphere (like lightning), a convenient way for energy to get from one place to another.
Magnetism
A fundamental force of nature, which causes certain types of materials to attract or repel each other. Permanent magnets, like the ones on your refrigerator and the earth’s magnetic field, are examples of objects having constant magnetic fields. Oscillating magnetic fields vary with time, and can be generated by alternating current (AC) flowing on a wire.
Resonance
Resonance is a property that exists in many different physical systems. It can be thought of as the natural frequency at which energy can most efficiently be added to an oscillating system. A playground swing is an example of an oscillating system involving potential energy and kinetic energy. The child swings back and forth at a rate that is determined by the length of the swing. The child can make the swing go higher if she properly coordinates her arm and leg action with the motion of the swing. The swing is oscillating at its resonant frequency and the simple movements of the child efficiently transfer energy to the system.
HISTORY OF WITRICITY
Tesla’s Vision of a Wireless World
In the late 1800’s and early 1900’s, at the dawn of the electrification of the modern world, some scientists and engineers believed that using wires to transfer electricity from every place it was generated to every place that it could be used would be too expensive to be practical. Nikola Tesla, one of the most well known of these scientists, had a vision for a wireless world in which wireless electric power and communications would reach around the world, delivering information and power to ships at sea, factories, and every home on the planet. Tesla contributed significantly to our understanding of electricity and electrical systems and is credited with inventing three-phase AC power systems, induction motors, fluorescent lamps, radio transmission, and various modes of wireless electric power transfer. WiTricity technology for power transfer is different than the technologies proposed by Tesla, but his work is referenced and acknowledged in the scientific articles published by WiTricity’s founding technical team.
WiTricity Technology
The experimental design consisted of two copper coils, each a self-resonant system. One of the coils, connected to an AC power supply, was the resonant source. The other coil, the resonant capture device, was connected to a 60 watt light bulb. The power source and capture device were suspended in mid-air with nylon thread, at distances that ranged from a few centimeters to over 2.5 meters (8.2 ft). Not only was the light bulb illuminated, but the theoretical predictions of high efficiency over distance were proven experimentally. By placing various objects between the source and capture device, the team demonstrated how the magnetic near field can transfer power through certain materials and around metallic obstacles.