In India, there are lots of people who still prefer trains to travel and spend days together to complete their journey. Most trains usually don't provide electricity even though there are charging sockets available. Even if they do, it is seen that such a charging facility takes a longer time than usual to fully charge the cell phone. Sometimes the passengers can even be seen fighting for charging their cell phones if there are less number of charging sockets available. I've myself witnessed people waiting at every coach's doors to get a chance to charge their phones.

To this problem, a common temporary solution may be a to use a typical PowerBank which doesn't last longer and need to be charged again. Solar cells are next preferred ones but are unreliable at most times and they are not economical too. So my unique solution to this problem is to use a Wind Generator. Since the trains run at least for 20 hours a day with a minimum speed of 30kmph, the wind hitting the windows can be converted into valuable electrical energy and hence charge our cell phones.

The application of this 5 watt wind generator is not just limited to a moving train but is immense as it can easily be used while travelling on any vehicle like bicycles, buses, motorbikes,recreational vehicles..etc.

In this simple Instructible I'll show you how to make one for yourself with the easiest method possible.

## Step 1: Materials Required

Method 1

If you have a 3D Printer, the materials required other than the 3D printer and the spool are

Method 2
If you dont have a 3D Printer

>>Epoxy Putty like Mseal

## Step 2: Polarity Test of the DC Generator

(Skip this test if you already know the polarity of the generator)

The polarity of the generator varies along the direction of rotation or the direction at which the propeller rotates. With the action of wind, some propellers are designed to rotate in clockwise direction and some are designed to rotate in anticlockwise direction.

Simply Connect the terminals of the propeller coupled generator to the respective positive and negative terminals of the voltmeter and conduct the test.

Just give a blow manually to the propeller such that it rotates. Simultaneously observe if the voltage read on the voltmeter for a positive or negative voltage.

>>If the voltage read is positive, then the terminal of the generator connected to the voltmeter positive is positive and the other terminal is negative.

>>Else if the voltage read is negative, then the terminal of the generator connected to the voltmeter positive is negative and the other terminal is positive.

Refer the video for demonstration of the polarity test.

## Step 3: Schematic/Circuit Diagram and Working

The total Circuit involved with the wind generator is shown in the above pictures.

Whenever the fan rotates, an emf will be generated. The output voltage is not constant. But in order to charge our phones, a constant voltage is necessary. For that we need to use a voltage regulator of constant 5v output. Even the output current through the voltage regulator is limited to 1Amps, and thereby making this wind generator a 5W energy source. There may be noise in the output, to mnimise the same, shunt capacitors are use. You can either use two 33 micro Farad capacitors or two 22 microFarad capacitors across input to ground and output to ground terminals. Finally a micro usb cable that is compatible with your phone can be connected to the output terminals to charge the phone.

You can either rig up the components on a perforated board or can even design a simple PCB, etch it, place the components and mount it on a DC generator directly.

## Step 4: 3D Printing (You May Skip This Test If You Dont Have a 3D Printer)

Some parts of the above 3d structures are used from ready made models available on Thingiverse and assembled by me through Blender software. You must edit the parts because the size of your DC motor may vary with that of mine. The main intention of myself uploading the 3d files are to provide you an access to the files used for my idea. I have attached the blender files in case you need to edit it. If you have used a motor with an outer casing of 25mm diameter., then you can go ahead and print all the parts separately and join it as shown in the above figures. I have used fevikwik to join all the parts.

After assembling everything, place your generator in the cylinder and attach a fan to it from the front. Since I have made a PCB, I have directly mounted the PCB to the generator. You can even attach the rigged up perforated board circuit which was shown in the previous step to the output of the generator and complete the working model.

## Step 5: If You Don't Have a 3D Printer

In case you don't have a 3D printer, then you can make an epoxy adhesive to attach a metallic clip to the generator like the one shown in the above picture and allow it to dry n .

After attaching the steel clip, connect the circuit which was shown in the previous step to the output of the generator and complete the working model.

## Step 6: Mounting Methods

This wind Generator can be Mounted on the rods of any moving vehicles regardless of the direction of movement of the vehicle or the window seating arrangement of the passenger in trains or buses.
For instance I have shown how to mount the wind generator in various ways.

## Step 7: Conclusion

>>This working model has been tested and found to be working successfully while travelling on a bike and bus with speeds no less than 40kmph. However, I didn't find the necessity to travel in trains so I could not experiment it personally and record the video there.

>>The Working video of the same while travelling in a scooter has been uploaded.

>>Feel free to ask any kind of queries. I assure you a reply to it as soon as possible.

>>My sincere thanks to all the staff of BMSCE Research and Development team for granting us the permission to use the 3D printer and providing other technical support.

>>Please vote my instructible for the contest "BRAVE the ELEMENTS" if you liked it. :)

<p>Would this work on a bike?</p>
My 12v dc motor won't light even a small led light :(
Assuming that the wind speed is 40kph.
How many hours it takes to fully charge a cellphone from 0% to 100% using that wind generator?
Is that okay to use a 18v dc motor and use a 5v regulator?
<p>It is absolutely okay! in fact the regulator 7805 supports upto 30V as input voltage.</p>
One more question. Can i use other capacitor like a 2.2uF 50v and the capacitor is 10uF 25v?
Thanks bro:)
<p>What is in the 4th image shown by you?? &amp; what is the circular thing in your video?? I have uploaded the pic of the thing about which i am asking.</p><p>Thank you.</p>
Please can anyone help me out with the above question??
Wats the reason fr using22uF and 33uF capacitors.....<br>Can we use any other capacitors too
<p>yes, you can use other capacitors too in that range.</p>
<p>Hey Sai,</p><p>I'm extremely sorry for the late reply. </p><p>Capacitors across the voltage regulators are used in order to obtain stability in the output voltage ie to reduce fluctuations. For more information, refer the datasheet of the voltage regulator.</p>
Can anyone pls say the motors rpm
<p>Around 12000 RPM, just look for a non geared brushed DC motor of 12V. That can fetch you such high RPMs.</p>
Can i know thae rpm of the motor used
<p>TryxCorp, this is a good idea for when you are traveling overseas as there are less restrictions than in the United States, unless you are in your own vehicle or a friends but still this idea could be used as a back up charging system at home. Place the propeller on the roof or mounted on a post and run the wires indoors or even outside under the porch and recharge your phone or ipod as the wind blows. I know they make portable solar panel chargers to travel with but this would also be handy on a cloudy/windy day where solar panels aren't going to work. I like the idea as an emergency back up form of electricity as well and will put it into my projects list to try and make. Your video, electrical drawings, and instructions are easy to follow. I am also following the email traffic on the regulator chip and the aerodynamics issue. Could you add multiple appliance wires to recharge more than one type of media on one generator? Is the generator strong enough to charge more than one item at a time?</p>
Thank you for the compliments? @warriorethos2.<br><br> The regulator will not cause any problems in my idea because the maximum generated voltage which my motor can provide cannot exceed 25V, and the maximum current demanded by normal smart phones cannot exceed 2A , even though if you use the phones which have turbo charging enabled. <br>The regulator gets heated up only when the input voltage exceeds 25V or when the load connected demands more than 2A. I have made sure that the above two conditions are never satisfied and hence protected my regulator. <br><br>You can always add extra appliances if you choose a higher power DC motor and an appropriate voltage regulator for your appliance/s. If you make the same kinda model with the same components as mine to charge many appliances, then the charging time increases since the current gets divided.
Thanks for the update.
<p>I think you mean a 7805 voltage regulator chip.</p>
<p>try the smaller diameter of the Guide in front.</p><p>for aerodynamic reasons it should increase the performance.<br>because,<br>when the bigger diameter is aft of the repeller, it will increase the velocity of the Air through the turbine/repeller.</p><p>google for &quot;ducted windturbine&quot;</p>
<p>I shall surely try dreiduke!</p><p>But I feel even my design has its own unique advantages of its own for the following reasons</p><p>- the greater the inlet area, the better as it catches more wind</p><p>- the smaller the outlet area in comparison to the inlet area, the greater is the difference in speed (the outlet velocity is greater than the inlet velocity) which leads to an increase in kinetic energy the rotor is able to catch</p><p>- the diameter of the outlet must be slightly bigger than the rotor diameter ensuring an optimum distribution of the wind at the contact surface of the rotor blades including the tips</p><p>Reference: <a href="https://www.instructables.com/id/How-to-build-a-wasp-wind-turbine/">https://www.instructables.com/id/How-to-build-a-was...</a></p><p>Even If there is a change in design needed, it would only increase very little efficiency. Moreover, my wind turbine has the potential to generate upto 25watts.....But I am limiting its output only to 5watts. Hence more increase in its efficiency is not really wanted. :-D</p>
<p>The i'ble you refer does not show any numbers on efficiency of the funnel. It's relatively narrower than yours and will thus produce less turbulences and so be more efficient. But I'm sure the profile I showed above is even much more efficient (wind resistance vs. additional turbine speed).</p>
<p>right, the key is to minimize turbulences.<br></p>
<p>&quot;the smaller the outlet area in comparison to the inlet area, the greater is the difference in speed&quot;</p><p>This theory is Right... in a closed system like a duct or a wintunnel., but not in an open system like free air. The will not be catched by this funnel, or not much.<br><br>i try to explain.<br>When the Outlet is bigger, so the Air speed is slower in the Wider area than in the smaller. But the surround streamed air has a specific velocity (depending on your Bike-speed oder Wind Speed) so the relative slow Air from the wider Outlet will accelerated by the surround air.<br>So a little underpressure will build up in the Duct/funnel/guide wich sucks Air trough the small turbine inlet.<br>so theoretical, when the Outlet area is 4 times wider than the inlet, the the air velocity through the inlet will increase up to 4 times the Windspeed.<br>!! theoretical !! NOT practical.<br><br>If the inlet is wider, than the outlet, so there is a little bit of airstream which will be catching, than without Guide, but if air is catched, so the outletvelocity would be higher than the inlet air vel. but for that pressure is needed<br>this is possible, if no Air can bypass the whole construction.<br>but in an open system the Air will bypass before pressure buildup will increase the velocity.<br><br>in opposite direction........ suction is the magic word,<br><br>i hope i could explain it with my bad english<br><br></p>
<p>From a look I'd say the wind inlet for the fan will cause a lot of turbulences and not improve the performance but rather spoil it. Also from a guess I think it would better work the reverse as in that case the large part will create some under-pressure to speed up the fan. Anyway. You should measure the performance with/out the wind fence. Eventually a simple protection ring (in form of a simple tube) would probably be the best for general use.</p><p>Else, I think this is an excellent idea. I already see those crowded trains in India with thousands of little windmills outside ;-)</p>
Thank you for the appreciation Thomas! ? The main intention of putting a wind fence was to redirect more wind to the propeller than usual way without a wind fence. The attached picture may explain u well
<p>I'd say the below shape would give you more boost. The wing shaped profile creates a higher laminar speed inside the ring without the turbulences. In terms of makability it should not be more difficult except you should not make a filled profile but one with support beams (save material and increase stability).</p>
<p>Even If there is a change in design needed, it would only increase very little efficiency. Moreover, my wind turbine has the potential to generate upto 25watts.....But I am limiting its output only to 5watts. Hence more increase in its efficiency is not really wanted. :-D</p>
<p>The advantages of my wind guide's design are as follows:</p><p>- the greater the inlet area, the better as it catches more wind<br>- the smaller the outlet area in comparison to the inlet area, the greater is the difference in speed (the outlet velocity is greater than the inlet velocity) which leads to an increase in kinetic energy the rotor is able to catch<br>- the diameter of the outlet must be slightly bigger than the rotor diameter ensuring an optimum distribution of the wind at the contact surface of the rotor blades including the tips</p><p>Reference: <a href="https://www.instructables.com/id/How-to-build-a-wasp-wind-turbine/">https://www.instructables.com/id/How-to-build-a-was...</a></p>
<p>I know your intention, but aerodynamics do not behave as one might intentionally think. Try your design in practice with and without the shield and see which actually works better. </p>
I actually tried both the ways.... but I didn't exactly observe which one was more efficient. All I observed was that both the ways worked pretty well but just thought wind fenced one worked better theoretically ? Next time when I travel, I'll surely test it out Thomas. Thank you for your valuable advice ☺
<p>Grand job - you could also make a clamp to fix the turbine to a train window frame.</p>
Thanks Buddy! :) Clamps can be designed again or modified according to user requirements
<p>where do i get the voltage regulator</p>
Any shop that sells electronic components. It does not cost more than 15rs! :)
I've posted this myself. Nicely done. Have you measured what current it is capable of at the does you traveled? No overheating of the voltage regulator?
My friend had tested it while travelling on a bus for over 30mins on a continuous charge. He had not observed any over heating of the voltage regulator. <br><br>Since the voltage is constant due to the usage of voltage regulator..... current will increase. But according to the datasheet of the voltage regulator, the maximum current is limited to 1amps. All smartphones support minimum charging up to 1amp current.

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