The proposed mini-electricity generator project is simple to build and may be used by students like a school project, or simply for hobbyists. The setup can be used to charge an assortment with electricity produced from wind power.
A dynamo is a form of alternator often related to bicycles for generating electricity which is used for lighting a small head lamp. The unit eliminates the need of an electric battery and provides a simple alternative for illuminating a lamp whenever the bicycle is motion.
A dynamo is a pretty interesting little generator which starts generating pure electricity as soon as its wheel is rotated. Basically, it really works on the fundamental principles of electromagnetism where current is induced in coils of copper wire under the influence of a rotating magnetic flux, generated by alternate shifting with the magnets North and south poles.
Before we move on to the actual project, interested enthusiasts may try building a homemade dynamo with the help of the explanation provided inside the following section.
Image Credit -
You need the following materials:
Procedure:
Bend the iron bar in “U” shape with dimensions as shown inside the diagram.
Cover the horizontal portion in the “U” having a reasonably thick paper former or insulate it with some kind of PVC tape.
Wind the copper wire neatly and gently over the above dressed section of the “U” channel, through uniform overlapping steps, until you have at least 6 inches of wire ends left for external connections.
Take the magnet and fix it (by gluing or some other suitable method) over a central metal rod and arrange the mechanism in the same way directed inside diagram.
Connect the coil ends to a small 3 volt torch bulb.
Now it’s just a matter of rotating the central rod/magnet assembly as quickly as the mechanism permits.
If the winding along with the mechanism specifications are perfectly optimized, it is going to instantly develop a nice glow within the filament with the bulb.
Your homemade DIY dynamo is ready.
However, these make cannot be even close to your readymade dynamo as much as efficiency can be involved, so for next main project, we'd want to procure a high quality readymade bicycle dynamo.
In one of my previous articles we discussed the building of a windmill generator using an ordinary motor. In the article I recommended the use of the anemometer principle while designing the propellers. The reason behind this was to avoid the inclusion of cumbersome rudders and sophisticated pivot mechanism. The propellers associated with anemometers do not depend on wind directions and therefore are capable of producing consistent, unidirectional, high speed revolutions under most wind conditions.
Although the application of a stepper motor posseses an advantage of driving the burden (charging batteries) directly, without require an external circuit, the unit is costly and needs higher wind speeds for optimum saturating levels. Moreover, new electronic enthusiasts are often confused with the specifications while procuring them.
Here, using a bicycle dynamo helps to make the procedures very easy, however since the unit generates electricity at relatively lower levels, it may well require a voltage booster circuit for driving a large quanity consistently. In the present application we are able to use the generated voltage for charging many Ni-Cd cells (1.2 V each) in series.
The mechanical build illustrated within the diagram is self-explanatory and quite easy to construct. As per regulations of as soon as of inertia, longer propeller shafts will assist you to generate greater torque and thus higher currents from the dynamo.
Practically though, you will find, only at optimum speeds, the generator produces voltages above 4 volts. Therefore, in order to get this voltage, that's ideally designed for the application even during dull wind speeds, we're going to require a voltage booster circuit or what is popularly termed as the “charge pump” circuit.
The simple charge pump circuit shown the following is simplicity alone. By interconnecting six NOT gates or CMOS inverters, inside way shown in the diagram, it is possible to boost any voltage at its input to greater than twice the exact level at its output.
Now it’s about fixing the stages in order and buying the required results.
Parts Required
You need the following parts to create this wind mill dynamo circuit:
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