Title: Power generation from rotational motion of ceiling fan or rotating surface.
Field: Electronics
Background:
The product comes from scarcity of power likely to arise in forthcoming years. As the ways to generate energy are limited in the world due to various factors such as the environment and limited resources of raw materials (fossil fuels etc), which lend to only conservation as the best option to curtail the energy needs as much as possible. So considering the law of conservation of energy and observing the need to save the conventional energy resources we came up with an invention to generate energy from ceiling fan's rotational motion i.e. harvesting conventional electricity, because ceiling fans contribute significantly to residential electricity consumption, especially in developing countries with warm climates. The domain used in this mechanism is conversion of the mechanical energy to electrical with use of dc generator. A dc generator gives electrical power when it is rotated mechanically. Here we are using the rotational motion of the fan as the mechanical input to move the DC generators.
Scope:
As per our observations,
Ceiling fan is a most used home appliance and significantly contributes in residential electricity consumption. In developing countries the use of fan is very much common and fan works for almost 24 hours at residential places, which consumes a lot of power. So the major beneficiaries of the product will be common people, the educational institutes and small offices. Also Colleges, hospitals, hostels are equipped with at least 50 fans where this energy generating mechanism may be used to power up electronic devices like computers, laptops and to run the various electronic devices and appliances. Another area of implication is big Industries, where they consume a large amount of power and where rotating turbine assemblies are used. Using same mechanism with these big rotating assemblies, we can produce a large amount of power which will apparently help to save a lot of conventional electricity. Recycling the available energy is the best way to save it.

History:
The first ceiling fan appeared in the early 1860s and 1870s, in the United States. At that time, they were not powered by any form of electric motor. Instead, a stream of running water was used, in conjunction with a turbine to drive a system of belts which would turn the blades of two-blade fan units. The electrically powered ceiling fan was invented in 1882. This ceiling fan had its own self-contained motor unit, with no need for belt drive.
By the 1920s ceiling fans were getting famous across the globe. Till the invention of electric air conditioning in 1950, the use of ceiling fans had become common. Meanwhile, they had become very popular in other countries, particularly those with hot climates such as India. Crompton-Greaves in 1937 had perfected the world's most energy efficient ceiling fans, thanks to its patented 20 pole induction motor with highly efficient heat-dissipating cast aluminum rotor shell. These ceiling fans consumed far less energy (under 70 watts of electricity) than the antiquated shaded pole motors used in most other American made fans, and far more efficient than using expensive air conditioning units. These fans gives only wind energy generated due to rotational motion of the fan, whereas this rotational motion i.e. mechanical energy can also be used to generate power and harvest the mechanical energy. So using this mechanical power, we can generate power and use it so as to power other electrical appliances.
Description:
There are mainly 5 components in the mechanism. They are:
a) Ceiling Fan
b) Frictional Assembly
c) DC Generator Assembly
d) Printed Circuit Board (PCB)
e) Output Pins

Detailed Description:
A. Ceiling Fan:
A ceiling fan is an electronic machine hinged on the ceiling which rotates mechanically when an input of electrical power is given to it. The rotations of ceiling fans are only used to give air at houses. In the product we are going to use the rotational motion of the fan to move the generator assembly and produce electrical power without increasing the required power consumption.
B. Frictional Assembly:
Frictional assembly is an arrangement of pulleys on DC generator and a rotating cylindrical surface. In assembly, rotating surface makes friction with the pulleys and rotates the shaft of DC generators to generate electricity. Frictional surface is a combination of elastic surface with resistive rubber and pulleys are plain surface circular discs. The friction between the two surfaces is responsible for the generation of electric power.
C. DC Generator Assembly:
A DC Generator is a machine which converts mechanical energy into electrical energy. It is based on the principle of production of dynamically induced e.m.f (Electromotive Force). Whenever a conductor coil cuts the magnetic flux, the back e.m.f. induced dynamically, according to Faraday's Laws of Electromagnetic Induction. This e.m.f. causes an electric current to flow, if the conductor circuit is closed. The assembly contains 6 DC generators in a horizontal plane having two groups of 3 DC generators connected in series. The output of both groups is taken out through PCB.
D. Printed Circuit Board (PCB):
A PCB is used to electrically connect electronic components using conductive pathways, tracks or signal traces etched from. The components on our PCB are Diodes, Transistors, Resistors, Capacitors, DC jack and Zener diodes.
E. Output Pins:
Output pin acts as connector between PCB and the storage batteries.

REVERSE ENGINEERING TECHNIQUE:
We employed REVERSE ENGINEERING technique to model our design. Reverse engineering is the process of discovering the technological principles of a device, object, or system through analysis of its structure, function, and operation. It often involves taking something apart and analyzing its working in detail to make a new device or program that does the same thing without using or simply duplicating the original. We have analyzed the conditions to implement the design and came up with this solution. We have made a frictional assembly, so that the each pulley of dc generator assembly attached smoothly on rotating surface based on rotating fan and apparently generate electrical power. We have done all the calculations for the rotations of the fan and respective motion of the pulleys on the generator assembly. We have designed printed circuit board of the existing design to get the regulated output.
MODELING:
We have modeled our design by using PRO-ENGINEER (PRO-E) software. PRO-E is a 3 D solid modeling application used worldwide by Engineers to design, develops, and analyses products. We have given mechanical input to the pulleys of DC generators so that it produces power.
DC generator assembly and frictional assembly are show in the figure. By employing elasticity between the pulleys and rotating cylindrical surface, smooth rotations are achieved by DC generator assembly. When the rotating cylinder completes 1 revolution then the pulleys will make 10 revolutions. As the fan is of 300 r.p.m, every pulley will make 3000 r.p.m. We have done simulation of circuit in NI MULTISIM software. NI Multisim is an electronic schematic capture and simulation program. Multisim is used to draw the circuit design and simulate the output for the given different inputs. We have designed our circuit by using this software and simulated it. Input given to fan is 50 Watts and we are harvesting 15- 20 Watts electric power, varying with speed.

Brief description of drawings:
Figure 1: First figure describes the operational portrait of the system including DC generator assembly and the rotating assembly along with the ceiling fan forming the first embodiment of the invention.
Figure 2: Second figure includes the structural design of the system including the power generation mechanism separately forming the second embodiment of the invention.
Detailed description of drawings:
Figure 1: First figure describes the operational portrait of the system including DC generator assembly and the rotating assembly along with the ceiling fan forming the first embodiment of the invention. The assembly shown in (figure 1.1) shows a circular plate which includes 6 DC generators, shown as power generation assembly. The assembly shown in (figure 1.2) shows the frictional mechanism. This mechanism has elasticity to drive the pulleys of DC generators smoothly. The assembly shown in (figure 1.3) shows the ceiling fan which rotates and produce mechanical force to drive the DC generator assembly.
Figure 2: Second figure includes the structural design of the system including the power generation mechanism separately forming the second embodiment of the invention. The assembly shown in (figure 2.1) shows the electronic circuitry that does the power regulation as per the requirement of the system. The assembly shown in (figure 2.2) shows the disc holding the DC generators. The assembly shown in (figure 2.3) shows the rotating cylinder which has elastic covering over it, for smooth functioning.

We Claim:
1. Electrical power is harvested by generating electric power from the rotational motion of ceiling fan.
2. The electric power is generated from the rotational motion of ceiling fan.
3. Frictional motion gives the mechanical input to the DC generator assembly, included in the embodiment.
4. Frictional motion is achieved by rotational motion of the fan which could be used to move the generator assembly mechanically.
5. DC generator assembly converts mechanical energy to electrical energy and transfers it to the PCB. PCB assembly is mounted on static disc holding the DC generators.
6. The harvested power is amplified using different combinations of amplifying circuits.
7. SPECIFICATIONS OF ASSEMBLIES
A) Addendum circle diameter of rotating cylindrical surface = 120mm. B) Addendum circle diameter of each pulley = 12mm. C) Revolution ratio between rotating cylindrical surface and pulleys 1:10. D) Maximum 3000 r.p.m. of each DC generator has been achieved.
8. The product can be enhanced by amplifying the harvested power to make it as "Self Powered Fan".
9. The present invention includes 6 DC generators placed on a horizontal plane along with an elastic frictional assembly based on the rotating plane of the ceiling fan.