TITLE-Design compact mobile charger powered by vibrations.
BACKGROUND–
while travelling through ST buses in rural areas. in such situation your’s mobile battery discharge.you have to charge the battery through that vibrations.
IDEA-
prepare such a mechanical device with the help of this we can convert vibratory motion into rotary.
MARKET SURVEY–
In the market, there is some mobile charger available such as power through while walking, available on electricity
Version 1
DESIGN IMAGE PREPARED ON SOLID-WORKS
LITERATURE SURVEY-
http://www.google.com/patents/US1616339
the great scientist stringer design and developed a apparatus in which we can convert vibratory motion into rotary motion they got patent in 1927 for this apparatus.the above fig shows the working. From reference:
“This invention relates to apparatus for converting vibratory motion into rotary motion and is particularly useful for the conversion of small and irregular vibrations such as are produced on or by vehicles.
Many attempts have been made to utilize the vibrations of vehicles, generally for the purpose of actuating moving advertisements, but none of the means hitherto employed for converting the vibratory motion into rotary motion has proved entirely satisfactory in practice. This is probably because the small and irregular vibrations require a more delicate form of ratchet than is generally employed.
According to this invention I employ the usual arrangement of a weight mounted on a spring in such a way that it will readily vibrate backwards and forwards in one line, I place the pulley which is to be rotated in this line, and a fix a thread to the weight pass it over the pulley, and attach it to a light spring. As the weight vibrates it alternately applies and removes the tension on one end of the thread while the spring produces a small but continuous tension on the other end. Consequently as the weight approaches the pulley there is a tension on one end only and the thread slides easily over the pulley, but as the weight recedes from the pulley there is a tension on both ends and the thread grips the pulley and turns it.
Two or more weights with their threads passing over the same pulley or over separate pulleys on the same shaft may be employed, and such weights are preferably arranged so that their lines of vibration are equally spaced around the pulley. Whenever the number of weights is small, and particularly when only one weight is employed, it is desirable to provide a device for preventing the rotation of the pulley in the wrong direction, as otherwise the thread might have sufficient friction to turn a light pulley instead of sliding over it on the approach of the weight towards the pulley. This device is conveniently a thread passing over the pulley and fixed at one end to the rigid frame and at the other to a light spring, so that the pulley turns easily in the direction which tightens the spring and removes the tension at the other end of the thread, but is prevented from turning in the other direction because the thread having a tension at each end grips the pulley.”
Images of prototype 1
Causes of failure of design no 1
- The stepper motor has more torque.
- Length of flat spring is not sufficient for vibration it is not possible to accomplish the need of compact design.
- as compare to vibration, fluctuations of flat springs are less so it fails.
Version 2
sector gear mesh with gear on motor shaft,when sector gear rotates at its pivot point,it gives motion to motor on both direction.weight is attached at free end of sector gear.
Actual working model
Version 3
Version 4
market survey for mobile charger
- A project report on mobile charger using piezoelectric sensor available in market.
- In human powered mobile charger by rotating the wheel of geared dc generator.
- Wind powered mobile charger is used to charge the mobile while travel ling wind turbine placed in such a way that it rotates due to wind available in market.
