Close
0%
0%

3D PRINTED PORTABLE WIND TURBINE

A small Portable Wind Turbine, mostly 3D printed!

Public Chat
Similar projects worth following
A wind turbine mostly 3D printed , which houses a BLDC motor as an electric generator. Foldable and no larger than a 2L soda bottle. Simple to replicate and with a low manufacturing cost. CAD, STL and how to make it included.
Licencia Creative Commons
Esta obra está bajo una Licencia Creative Commons Atribución 4.0 Internacional.

Generally when I want to get away from the city and camp, I take some kind of power source with me. Within my preferences are the Power Banks. With a small and light one, of approximately 40 Watt hours (Wh), I can charge my cell phone about 2 or three times and that is fine if I am only going to spend a day and do not need to power other equipment such as my camera, for example. If I want to spend more time then I usually take a 222Wh “Solar Generator” with a 60W portable panel. For the energy needs that I have in this type of excursion, it is generally enough for me.
About a month ago I made an excursion of several days and to my surprise at the end of the second day my energy sources had been completely exhausted, also no Sun . I have discarded fuel generators because they are very noisy, polluting and can cause fires. There was a small stream near where I camped and there was also wind that I could have taken advantage of, but I really wasn't prepared for it. I promised to find a solution and include it in my new adventures. I am sure that there are several people around the world with this type of need, that is why I carry out this project so that they can also benefit.
In this project I show you how to make a small portable wind turbine, mostly 3D printed, capable of providing about 12W of power and with dimensions similar to a 2L soda bottle when folded. Although its generation capacity is limited, having it can be beneficial during emergencies or when access to more convenient energy sources is zero or very limited.
Although the initial motivation to carry out this project was not linked to teaching at school, I consider that it constitutes an excellent opportunity to link this type of technology with the teaching-learning process. To be able to present a product of this type at School Science Fairs, which harnesses the energy of the wind wherever the conditions exist, small, very portable and easily installed, should be striking and interesting. Students could answer questions and present the results of electrical measurements of their performance at different wind speeds. I think it would be an enriching experience for everyone.

DESIGN CONSIDERATIONS
For some time the idea of designing a portable wind turbine had crossed my mind. From my experience and for it to be useful I knew it had to be small, maybe the size of a soda bottle, able to fit inside a backpack. Its mass should also be as low as possible.
Since the plane of rotation of the propellers in typical wind turbines is perpendicular to the position of the electric generator, they are initially inconvenient to transport and store once assembled, even when small. I also didn't want to have to use tools to mount and dismount the propellers every time I was using it. Folding propellers, that was the idea, but how to implement it? It took me a while to come up with the answer. Have you seen the way bats sleep? The wings are folded towards the body, that could be the answer. Nature is an excellent source of inspiration, millions of years of evolution support it.
Taking the previous idea as inspiration, I designed this wind turbine.
Since on my travels I usually carry some kind of lightweight tripod to take pictures when the light conditions are low or to make time-lapses, perhaps also using it to support the wind turbine would save the need to carry other equipment. There are thousands of possibilities to support a camera and make it compatible with those pre-existing technologies, I think it would be convenient.
Regarding the generator to use, it was another difficult part to decide. Ideally it would have been to design and build a customed one, but  unfortunately, I did  not have the possibility of building a quality one as I did not have the required manufacturing technology at hand. That is why, a NEMA 17 stepper motor has been selected as generator due to its availability. Another reason to consider when selecting a stepper motor is that ...

Read more »

WINDTURER_P4_ROTOR.wpa

QBlade design file of WINDTURER_P4 PORTABLE WIND TURBINE

wpa - 5.36 MB - 10/03/2022 at 01:53

Download

FINAL_WINDTURER_P4_STEP_IGES_X_T_STL_3MF.zip

In this Zip I include the necessary files if you want to replicate or modify this project. This is Prototype 4, which meets the design requirements established from the analysis of Prototype 1.

x-zip-compressed - 15.32 MB - 10/02/2022 at 20:37

Download

RAR Archive - 9.82 MB - 07/05/2022 at 17:09

Download

x-zip-compressed - 17.68 MB - 07/02/2022 at 01:48

Download

STL_Prototype 1.zip

STL and STEP files (Proyotype 1)

x-zip-compressed - 8.45 MB - 06/23/2022 at 15:00

Download

View all 6 files

View all 13 components

  • NP- F batteries as energy storage system of the Windturer-P4

    adriancubas7 hours ago 0 comments

    From the beginning of this Project I always wanted to store the energy captured in lithium batteries, preferably in 18650 type cells. I consider that these cells are a proven technology, with a high energy density, with a high level of safety, accessible and with a not so high price.

    NP-F batteries in their different configurations (330,550,750,970 etc…) have this type of cells inside in a 2S configuration, that is, two cells connected in series. In a previous Log, where the electrical characteristics of the generator were addressed, it was concluded that a 2S configuration with a voltage range of 6V-8.4V is recommended as a storage system and this type of battery has this configuration.

    As a reference let's take the Samsung INR18650-25C, its technical data sheet can be consulted here: https://www.powerstream.com/p/INR18650-25R-datasheet.pdf

    This type of cells can support a maximum of 4A of recharging current for each cell, this is a higher value than that delivered by the generator of our Portable Wind Turbine. We can extract from them a maximum of 20A of discharge current continuously. They have a capacity of 2450mAh, when discharged at a rate of 10A. After 250 recharge and discharge cycles they offer only a 2Wh decrease in capacity from the initial 7.4Wh (4A recharge current down to 4.2V and 20A discharge current down to 2.5V). At -20 degrees Celsius and  10 A of discharge current and 4 A recharge current, they retain 96 percent of their original capacity.

    I don't think that all NP-F battery manufacturers use this type of Samsung cells, although I think that the characteristics of the ones they use should be similar in several respects.

    Also, NP-F batteries have a BMS circuit inside them that adds safety and protection functions to the cells. I took the job to disassemble one of these to see its internal structure and analyze its characteristics. Specifically, it was an NP-F970 with a charging circuit and USB output https://amzn.to/3rsHtzq *affiliate link*

    In the previous photo you can see that this battery is made up of 6 18650 cells in 2S3P configuration. The circuit that can be seen above these cells is a BMS (Battery Management System) and the one that can be seen below is the recharging circuit, charge level indicator and USB output. You can recharge this type of battery with a charger specialized in NP-F batteries or simply through a micro USB connector. You can also power your compatible USB devices directly from this battery.

    These batteries also come encapsulated in a plastic case that, while I don't necessarily consider it waterproof, I do consider dust and splash resistant. If any of you know if there is any IP-X certification for this type of battery, could you tell me where to find it?

    One of the main functions of the BMS is to prevent overcharging and overdischarging. In addition, these circuits protect against short circuits, limit the intensity of maximum charge and discharge. To test these features, I ran several experiments trying to find answers to the following questions:

    - Does this battery have short circuit protection?

    - What is the maximum charging current supported?

    - What is the maximum load current supported?

    - What is the maximum voltage that the BMS allows to the cells?

    - What is the minimum voltage that the BMS allows to the cells?

    The battery has short circuit protection.

    The maximum charging current supported in my experiments was around 4.75A as can be seen in the video. For this, a variable current source was used and the current value was increased until the BMS circuit interrupted the recharging process. The experiment was repeated several times and the results were consistent.

    To check the maximum discharge current a Load Tester was used like this https://amzn.to/3yd4HNM *affiliate link*

    This battery exceeds the 5A discharge current of this module, triggering its overcurrent protections. I tried to use a 55W car...

    Read more »

  • Introducing Prototype 4 Blade

    adriancubasa day ago 0 comments

    Having designed and printed several Blades from the previous Prototypes and experimented with them, I still wasn't happy with the results and knew that they could be more compact and efficient.

    For example, the Blades of Prototype 1, which I call the "Intuitive Blades" were designed without the assistance of specialized programs such as QBlade and although their behavior was correct, their performance is much lower than the one I present here. Also, this Blade has a mechanical weakness and under reasonable stress they would always break in the same place. Below is a photo of this problem.

    In the case of the Blades of Prototypes 3 and 4, they turned out to be very large for the objectives of this project and it is not very clear to me that they can withstand winds of about 35Km/h.

    So that the Blades P2-P3 could be printed on an Ender 3-type printer, not exceeding the height of a 2-liter soda bottle, a kind of hinge was designed that joined the two parts of the Blade. This area is also prone to damage, especially since it is a larger Blade and the "centrifugal" forces during rotation are greater.

    I do not rule out using this type of Blade in other projects if I use other types of more resistant 3D filaments, but I think that for the requirements of this Project they are a bit oversized and make manufacturing more complex and make the project more expensive.

    The Prototype 4 Blades turned out to be the right balance I needed. They do not exceed 22cm in length and their performance is on wheels.

    Let's analyze some images of the QBlade program where I designed them.


    The Blade P4 is based on the NACCA 6409 airfoil.

    One of the frequent problems in this type of fixed pitch wind turbines is starting at low RPM. In order for the Blades to do their job efficiently they must operate at relatively high rotational speeds. This type of profile has proven to be effective at low RPM and guarantees higher lift forces during starting. It is also a narrow profile that results in thinner Blades and lower mass which contributes to less material being spent when printing them and lower forces being generated during rotation.

    In the image above it can be seen that this profile reaches its maximum Lift coefficient (Cl) around 12 degrees of pitch, however we are interested in the angle for which the relationship between the lift and drag coefficients is maximum. The angle for which this occurs is around 5 degrees. When assembling the propellers with the rest of the set, the Blades must be rotated around this angle. All the simulations were made considering a Turbulent Flow (Reynolds Number 100000). This is due to the typical operating conditions of this wind turbine at very low height from the ground.

    In the image you can see the position, chord length, angle of attack and type of profile data obtained after the Betz optimization for a Tip to Speed Ratio of 3. Knowing these values and the type of profile chosen, the Blades can be modeled in the 3D design programs. The Blade was sectioned into 11 parallel planes with a separation distance of 22mm between each. In the Files section, the analysis and design file of the Prototype 4 Blade is included.

    QBlade is a public source, cross-platform simulation software for wind turbine Blade design and aerodynamic simulation. https://qblade.org/ 

    This simulation tells us that at wind speeds of 30km/h a maximum generation power of approximately 40W is obtained. At lower speeds and more common at low altitude, say 20 km/h we get about 12W. Although it could be stated that we have designed a 40W Power wind turbine, this statement is really not very transparent and only in exceptional cases could we obtain those values.

    In this LLT (Lifting-line theory) simulation, the three-dimensional behavior of the designed Rotor is appreciated when it faces a wind flow of 6m/s (21.6 km/h), obtaining about 26.3W of power. In real conditions and considering...

    Read more »

  • RESULTS OF THE ELECTRICAL MEASUREMENTS TO THE GENERATOR P4

    adriancubas09/23/2022 at 13:40 0 comments

    Following a procedure similar to the electrical measurements that I have made to the previous generators (motors), I present below the results that I obtained with the Prototype 4 generator.

    I coupled the P4 generator to a three-phase electric motor whose RPM was varied with a VFD (Variable Frequency Drive). Using an oscilloscope with a magnetic probe, I accurately detected the rotational frequency and thus the RPM at which the P4 generator was rotating. Measurements of the relationship between open circuit voltage vs. RPM, short-circuit current vs. RPM, as well as charging current for 18650-type lithium batteries in 1S2P and 2S3P configuration, respectively, vs. RPM were made.

    A DC Boost-Buck Converter type converter inserted between the generator and the batteries was also used to see if there was an increase in the charging current.

    During the experiments and measurements carried out, the following questions were answered

    1- What is the electrical resistance value of the motor windings?

    2- At how many RPM of generator P4 is 1V (kV value) obtained?

    3- What is the maximum short circuit current at the expected RPM in the rotor?

    4- What is the best configuration of 18650 batteries (1S or 2S) for the storage of the energy generated in the wind turbine?

    5- Does the use of DC-DC converters favor an increase in the charging current of the batteries with this generator and under the expected operating conditions?

    The results presented below will influence the design of the Blades and the energy storage system.

    The motor windings turned out to be approximately 6.5 Ohms. Recall that this generator was wound with 80 turns per pole in a star-shaped three-phase configuration. The wire gauge used was 0.35mm in diameter. In total there were 12 poles.

    The motor turned out to be approximately 60kV, that is, for every 60 turns of the rotor, 1V is obtained. This graph shows the values obtained.

    The maximum short circuit current was 1.7 (A) at 888 RPM. The results are shown below.

    The charging current values in the single cell configuration are higher than those of 2 cells, however, the energy generated in both cases is very similar at the same RPM. I consider using the configuration of 2 18650 cells in series, since the resistance torque is less in the generator. It also makes it possible to obtain the necessary RPM for the rotor to work with good efficiency, at higher RPM. In addition, the resistance torque is less when the rotor begins to rotate.

    The cells that were used are capable of storing 8.14Wh of Electric Energy each. In the case of the 2S3P battery, it has a total of 6 cells, which means that it is a 48.86Wh battery. If we divide this value by 7.4V, which is the nominal voltage value of two 18650 cells in series, we obtain that it is a 6600mAh battery. This Batt at a stable charge rate of 0.6 A would take around 11 hours (estimate) to fully charge. A Samsung Galaxy S22+ battery is 4500mAh, but at 3.7V, which translates to about 16.65Wh. Ignoring the energy losses, we can estimate that in 11 hours, you would be able to charge this phone at least approximately 3 times. About 3 hours and a half approximately for each charge of the phone.

    There are several assumptions in this reasoning, but I think it gives an idea. Results may vary and charging current may be higher or lower on average, depending on wind speed.

    A DC-DC (Boost-Buck) converter was also used in the experiments. At approximately 300 RPM in the generator, which corresponds to about 5V of voltage obtained, the converter begins to deliver an output at stable voltage. Through two potentiometers this value can be configured up to 35V. It is also possible to set the maximum delivery current of this module up to a maximum of 4A.

    However, when the batteries to be charged are connected in both configurations (1S and 2S), it is not capable of regulating the output voltage. The voltage drops to similar...

    Read more »

  • PROTOTYPE 3 REJECTED!

    adriancubas09/17/2022 at 15:24 0 comments

    It's hard to say, but I had to abandon the development of prototype 3. Don't worry, I'm not going to abandon this project, in fact, today I am in a much more advanced step than what I am going to describe in this Log.

     The main reasons that supported the design of prototype 3 were precisely related to the characteristics of the selected generator. Let us remember that it was a BLDC motor, recovered from a DJI M600 Drone. This type of motor, as explained in the measurements made to it in a previous Log, is capable of producing one volt for approximately every 130 RPM. To get 10V the propellers had to turn at 1300 RPM, very fast for normal wind conditions. In order to obtain those RPM in the generator (electric motor) but for the propellers to turn at lower RPM and taking advantage of the torque of the new designed propellers, prototype 3 includes belts and pulleys. Here the problems begin, this design requires at least three bearings, two GT2-type pulleys and two custom-designed axles, in addition to the remaining bits and pieces from previous prototypes. It also turned out to be very large and heavy. The structures that would support it would also have to be larger and that would also lead to more weight. Too complicated and expensive for my taste! I inadvertently fell into the trap of looking for complicated redesign paths.

    I know many people hate Stepper Motors as generators and to a certain extent I understand them (they are inefficient and quite heavy), but believe me that in wind generation devices as small as this project, it is very difficult to beat at low RPM. That is why my first build (Prototype 1) used a Stepper Motor.

    Prototype 1 turned out to be well accepted and today I am proud to receive feedback from users of this platform who have already replicated it and are getting their own performance and application experiences. It has been used as a power source for automatic chicken coop doors, even as an electrical power source for remote sensors that measure humidity, temperature, wind speed, etc.

    Prototype 1 proved to be feasible, but there is certainly room for improvement and I have been on that path for a few months now.

    Prototype 4 has already been designed and features a modified BLDC motor as a generator. The same motor I once rewound from 35 turns per pole to 50 turns today is 80 turns per pole (12 Poles in total) using a thinner wire gauge (0.35mm diameter) and improving my winding skills lol. It was connected in a star configuration with three phases. In the next log I will explain its electrical performance, but let me tell you that due to the previous tests that I have been able to carry out, it perfectly meets expectations and exceeds the stepper motor of Prototype 1 in generation.

    I leave you some photos of the process and a small demonstration. Thanks for reading. You guys are all amazing. See you in the next Log!!!


  • Rectifier Circuit + Capacitor ready!

    adriancubas07/29/2022 at 15:50 0 comments

    In a previous Log I published the Full Wave Rectifier + Capacitor circuit that I intend to use in this Wind Turbine. Thanks to PCBWay and his kind team this circuit is now a reality! From what I have been able to verify, the manufacturing and quality control process is very well structured and at all times the user can know what stage of the process their order is at. They have a very intuitive and very helpful Web platform. Something that caught my attention is that they sent me preliminary photos before the final assembly to check any detail that could be correct or not and correct it before concluding the work. After my confirmation they proceeded with the remaining steps.

    I have shared the project on the PCBWay digital platform at the following link. Through this you can order its manufacture and I guarantee that the results will be incredible.

  • Prototype 3!

    adriancubas07/05/2022 at 17:24 0 comments

    I have finished the mechanical design of prototype 3 and I think the final product should be very close to this design. Last changes can always arise, hopefully not many because it can be overwhelming. In this latest design, as you will notice, timing belts and pulleys have been used. I have used a 1:2 ratio but you can substitute it to a 1:3 ratio depending on the field tests. This time I do not plan to include any electronics in the body of the wind turbine, just a 3-pin connector for the three phases . Then I will design a box with the electronics and everything else.

    I went back to the original idea that it was an upwind and not a downwind wind turbine. This design offers the possibility of using other motors (generators) with some small changes in the central body part.
    I will publish in the gallery some renders that I have done. That's all, see you in a next Log!

  • Backyard's first tests of prototype 2

    adriancubas06/29/2022 at 01:12 3 comments


    I needed to do these tests because I have to decide if I need to use gears or other power transmission mechanisms, in which case I would change the design a bit.

    It is not enough to make the propellers rotate, it is necessary to generate an adequate voltage and current value for storage in batteries and subsequent use, hence the need for these mechanisms may arise.

    We should remember that I already tried to rewind BLDC motors to get higher voltages. The ferromagnetic cores of the stator have limited space for the copper wire and to increase the number of turns per pole it is necessary to use finer gauge wires which greatly limits the output power. Since this Wind Turbine has to be small because it is "portable" I find this solution unfeasible for the power I want with this new prototype. If the power is not something of primary interest, then I recommend building the Prototype 1 which is much simpler than this and guarantees about 3-6W of Power without major complications.

    During the first phase of the tests I verified that the propellers could rotate and start the movement by themselves without gears. In this case, the motor is directly coupled to the hub as it was assembled in the previous Log. Unfortunately there was no wind at all that day and I had to use a common household fan. You may not see it in the video, but the fan blades are much shorter than the wind generator blades. This constitutes a limitation, but in spite of it it began to rotate. From my previous experiments I have been able to learn that if it works with the turbulent and relatively low flow that a fan provides it will do very well in real world conditions. Luckily nothing came off or flew away hahaha!!! The maximum voltage obtained was 2.66V, a bit low for my needs. This voltage value corresponds to about 400 RPM according to my previous experimental results. I know that this voltage value could be increased in suitable wind conditions. My intention is to manage to charge 18650 lithium cells connected in parallel until they reach their maximum voltage of 4.2V. The number of cells in parallel will depend on the generation current. BMS, Buck boost converters, Power Meter and others are required that when I finish this part of the Project I will have to integrate.

    During the second Phase I did some tests on the generator, but this time coupled to gears with a 1:4 ratio. As can be seen, it is not capable of starting the movement on its own, although it is capable of sustaining it without problems once a minimum RPM has been reached. An automatic angle of attack variation system would perhaps be a benefit. A higher angle of attack would guarantee the start of the rotation and then the angle of attack would be decreased to achieve higher RPM and improve efficiency. This would make this project much more complex and would also make it more expensive, something that I prefer to avoid.

    I think I am going to redesign the generator to integrate a 1:2 ratio power transmission system. I would like to know your opinion.

    See you in a next Log!!!

  • Full bridge rectifier + capacitor circuit

    adriancubas06/23/2022 at 14:26 0 comments

    I have designed this rectifier circuit using Schottky diodes capable of withstanding 15 amps. Perhaps it is an exaggeration but I prefer to be prepared for any surprise. The use of these diodes guarantees lower losses in the rectification process compared to more common rectifier units.
    If you wish, you can now download the Gerbers Files and print the PCBs from the Files section.
    In my case I made the connections quickly with cable connectors as shown in the photo and it went very well.
    Having completed this stage guarantees to make the measurements and experiments that I want to do perhaps in the next week. I plan of course to post here the process and its results.
    See you in a next Log!

  • From design to reality!

    adriancubas06/09/2022 at 01:46 0 comments

    This video shows the position and assembly of the fundamental pieces of the central body. In a future log I will show some electrical measurements, before going into the design of the electronic rectification and regulation circuits.

  • ​ The Mechanical Design of Prototype 2 is almost complete!

    adriancubas06/01/2022 at 19:28 0 comments

    I have been working hard to finish the mechanical design of this new variant of Portable Wind Turbine. As you can see in the image some changes have been made. It is now a Down-Wind Wind Turbine. A new blade grip system has been designed that allows you to manually change the angle of attack of the blade and experiment without having to glue it down. Although folded it is of similar dimensions to prototype 1, its power is much higher. Blades are almost twice as long.

    As I have designed the pieces I try to print them and physically test them with the rest of the assembly, if everything goes well I continue the other parts of the design. Printing them is taking me a long time since I have printed them at 100 percent infill except for the Blades
    I am impatient to test this new model.
    Cheers!

View all 15 project logs

  • 1
    Build Instructions Prototype 1: DOWNLOAD AND PRINT ALL THE STL PARTS OF THE ASSEMBLY

    You can download the pieces from here in the FILES section. As I make changes to any of them, I will replace the corresponding file so that the most up-to-date ones are the ones that are published.

    I've included a STEP file in case you want to take a closer look at the assembly or change something depending on your interests. If you need any special type of file format let me know and I'll see if I can help.

    I have printed my prototypes in PLA. I will probably end up printing it in ABS or PETG, although PLA has worked very well for me so far.

    In this system, the parts are subjected to relatively high mechanical stress. That is why I have printed all the pieces at 100% infill with the exception of the propellers and tail, that I finally decided to print at 40%. The thickness was 0.28mm in all cases. I used a Longer LK4-PRO printer with a 0.4mm nozzle.

    The propellers were printed one at a time. They took about 6 hours each. I used supports and the position was as shown in the picture. The support pattern was CUBIC and I used CURA slicersoftware.


  • 2
    Build Instructions Prototype 1: INSTALL THE COLLET PROPELLER ADAPTER IN POSITION

    To do this you must insert it inside the hole that the Central Hub has. On the other side, place and adjust the nut until the assembly is tight. Since the Blades and Hub will rotate in the opposite direction to the tightening direction of the Collet Propeller adapter, there is less risk of the assembly coming loose.

  • 3
    Build Instructions Prototype 1: BOLT THE BLADE ENDS TO THE CENTRAL HUB

    All the holes in the designed parts are for M3 screws. Place the pieces as shown in the images, but do not overtighten them. The Blade Ends shall be able to articulate freely 90 degrees.

View all 7 instructions

Enjoy this project?

Share

Discussions

Michael Bravo wrote 08/03/2022 at 15:03 point

What are your design expectations on mounting the turbine in a lightweight "adventure" usage scenario? Just use a stick? :) Photo tripod should probably do, but not everyone has one with them.

  Are you sure? yes | no

adriancubas wrote 08/03/2022 at 15:20 point

Haven't given it much thought yet but I think a viable alternative would be an extension pole, ropes and ground anchors.

  Are you sure? yes | no

Biffabelly wrote 07/03/2022 at 15:07 point

Do you think it would it be ok, to use a 1000V 10A Bridge rectifier instead of the 3Amp ?

  Are you sure? yes | no

adriancubas wrote 07/30/2022 at 22:09 point

Yes, there is no problem with using 10A rectifiers, although they are usually larger. My recommendation is to use Schottky diodes. Please see log 11 for more details. Regards

  Are you sure? yes | no

jeff.crown wrote 05/20/2022 at 22:30 point

When you're closer to a finalized version I'd definitely be interested in purchasing it from Tindie!

  Are you sure? yes | no

adriancubas wrote 05/20/2022 at 23:16 point

:)

  Are you sure? yes | no

goldrick31401 wrote 05/12/2022 at 00:19 point

So I guess using gear reduction would be in order?

  Are you sure? yes | no

adriancubas wrote 05/12/2022 at 01:21 point

I'm trying to avoid using gears, but it might be a workaround. I have already gotten a bldc motor to deliver 6V at 600RPM with a short circuit current of 2.6A (had to rewind that motor). With those values i can use a boost converter and stabilize an output voltage. I keep experimenting. Greetings

  Are you sure? yes | no

tomasfarken wrote 05/10/2022 at 07:46 point

I like the project very much!!!! :-)

  Are you sure? yes | no

adriancubas wrote 05/10/2022 at 15:35 point

Thank you, I really appreciate your comment!!!

  Are you sure? yes | no

Todd Medema wrote 05/10/2022 at 00:36 point

What wind speed range will this work in? Would love to see a wind speed vs watts graph!

  Are you sure? yes | no

adriancubas wrote 05/10/2022 at 15:34 point

Right now I am trying to improve the generation efficiency of the stepper motor. Apparently, when the RPM exceeds around 800 RPM, the increase in the frequency of the alternating current generated leads to a notable increase in impedance, which greatly limits the output current. I work on two solutions: A new permanent magnet rotor for the stepper motor and a rewound BLDC motor. When I get an acceptable output power, I will publish the dependencies between magnitudes, including the one you suggest. Greetings

  Are you sure? yes | no

cr15 wrote 05/08/2022 at 03:07 point

Can you be a little more specific on the collet adapter? When I click on the link it's just pulling up an amazon search.

  Are you sure? yes | no

adriancubas wrote 05/08/2022 at 03:42 point

You need a "prop adapter" that is capable of holding the 5mm shaft of the stepper motor(generator) and has a thread length of 12mm or a little more. The thickness of the screw is 6mm. The one I used is out of stock. i think this can work https://amzn.to/3vVjOeh

  Are you sure? yes | no

cr15 wrote 05/13/2022 at 15:43 point

Got it. Will post something when I get everything put together. 

  Are you sure? yes | no

Alexey Vazhnov wrote 05/03/2022 at 17:54 point

Adriancubas, amazing project!

Could you please share it under some opensource license?

  Are you sure? yes | no

adriancubas wrote 05/03/2022 at 21:10 point

Sure, no problem! How do i do it?

  Are you sure? yes | no

Alexey Vazhnov wrote 05/03/2022 at 21:19 point

If you have already selected a license, then just add a file like "LICENSE.txt" to the files and maybe add a note into "details" or "description" chapter.

If you didn't select a license yet, then I can suggest something like "CC-BY 4.0 or newer" or a "public domain", but this choice is completely up to you, of course.

  Are you sure? yes | no

adriancubas wrote 09/23/2022 at 15:13 point

I just licensed this project under this license. Thanks Alexey for your suggestion

Attribution 4.0 International

(CC BY 4.0)

  Are you sure? yes | no

Alexey Vazhnov wrote 09/23/2022 at 15:17 point

CC-BY 4.0 international — awesome!

adriancubasadriancubas, thank you!

  Are you sure? yes | no

tazelaar wrote 05/01/2022 at 18:52 point

more interested in a belt wind turbine like humdinger 

  Are you sure? yes | no

adriancubas wrote 05/02/2022 at 20:45 point

Yes I will definitely do one of those in the future!

  Are you sure? yes | no

dzuljo wrote 04/30/2022 at 05:48 point

Hello,thanks for the project,I like a lot. 
Maybe is my printer problem or dimension on the printed file is wrong. 
Extremo de Hélice inside hole is 14mm. 
Hélice is 15mm. 
Not possible to fit together.
Kan you please check?
Thanks

  Are you sure? yes | no

adriancubas wrote 04/30/2022 at 12:09 point

I'll check the model as soon as I get home. If I have any interference in this part of the assembly I will correct it and let you know. I know others have already started printing the parts. Has anyone else encountered this problem? Glad you liked this project!

  Are you sure? yes | no

adriancubas wrote 04/30/2022 at 13:47 point

I just checked and I have no interference in the design. The pieces between each other have a gap of 0.2mm. The Blade 15mm cylinder would go into the 15.2mm hole in the other part. I just uploaded some pictures of this in step 4 of the instructions. Send me a close up photo of the problem to see if I can think of a solution.

  Are you sure? yes | no

SirDezzy wrote 05/14/2022 at 08:49 point

Hi, this is a very good project but I am also having printed size issues. So far, none of the propellers are fitting into Part B. Also D does not fit onto A. Very odd.

  Are you sure? yes | no

Similar Projects

Does this project spark your interest?

Become a member to follow this project and never miss any updates