witricity

Topics: Resistor, Magnetic field, Electromagnetism Pages: 94 (15971 words) Published: August 6, 2014
 Major project
report

WIRELESS
TRANSMISSION
OF
ELECTRICITY

Submitted by.............
1.Anurag Burman (0205ex081003)
2.Jayant Mukherjee (0205ex081006)
3.Kalyani Shekhar Chourasia (0205ex081007)
4.Shubhangi Agrawal (0205ex081026)
5.Swati Singh (0205ex081028)
6.Nitesh Prajapati (0205ex083D03)

CHAPTER 1

INTRODUCTION

In the early 20th century, before the electrical wire grid, Nikola Tesla devoted much effort toward schemes to transport power wirelessly. However, typical embodiments (e.g., Tesla coils) involved undesirably large electric fields. The past decade has witnessed a surge in the use of autonomous electronic devices (laptops, cell phones, robots, PDAs, etc.). As a consequence, interest in wireless power has reemerged. Radiative transfer, although perfectly suitable for transferring information, poses a number of difficulties for power transfer applications: The efficiency of power transfer is very low if the radiation is Omni directional, and unidirectional radiation requires an uninterrupted line of sight and sophisticated tracking mechanisms. A recent theoretical paper presented a detailed analysis of the feasibility of using resonant objects coupled through the tails of their nonradiative fields for midrange energy transfer. Intuitively, two resonant objects of the same resonant frequency tend to exchange energy efficiently, while dissipating relatively little energy in extraneous off resonant objects. In systems of coupled resonances (e.g., acoustic, electromagnetic, magnetic, nuclear), there is often a general “strongly coupled” regime of operation. If one can operate in that regime in a given system, the energy transfer is expected to be very efficient. Midrange power transfer implemented in this way can be nearly Omni directional and efficient, irrespective of the geometry of the surrounding space, with low interference and losses into environmental objects. The above considerations apply irrespective of the physical nature of the resonances. Here, we focus on one particular physical embodiment: magnetic resonances. Magnetic resonances are particularly suitable for everyday applications because most of the common materials do not interact with magnetic fields, so interactions with environmental objects are suppressed even further. We were able to identify the strongly coupled regime in the system of two coupled magnetic resonances by exploring nonradiative (near-field) magnetic resonant induction at megahertz frequencies. At first glance, such power transfer is reminiscent of the usual magnetic induction (10); however, note that the usual non resonant induction is very inefficient for midrange applications.

Wireless power transmission has been proposed as a means to provide virtually continuous power without the use of transmission wires. The uses for wireless transmission can be divided into terrestrial (point-to-point power transfer on Earth and Earth generated power broadcast to the upper atmosphere or space) and space (space generated power broadcast to ground and space-to-space power transfer). The idea for delivering solar power from space to help meet the growing energy needs of developed and developing nations was conceived by Dr. Peter Glaser (1968) in 1968. Dr. Glaser’s concept was orbiting satellites converting solar energy and transmitting the energy to Earth via a radio frequency energy beam. Satellites placed in geosynchronous equatorial orbit 35,800 kilometers above the Earth’s surface would be continuously illuminated for most of the year. As a result of the orbit location, the amount of sunlight shining on the satellite during the year is five times more...
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