Skip to main content
18 events
when toggle format what by license comment
Nov 22, 2016 at 18:49 history edited Autistic CC BY-SA 3.0
English grammer and spelling
Nov 12, 2016 at 12:37 vote accept Ammar Mahadi
Nov 12, 2016 at 11:54 review Close votes
Nov 22, 2016 at 18:49
Nov 12, 2016 at 11:17 answer added Russell McMahon timeline score: 2
Nov 12, 2016 at 10:43 comment added user16324 Check out this Q&A for a run-through of the basics. electronics.stackexchange.com/questions/177513/…. If you're using brushed DC motor it'll be less efficient btu you won't need a rectifier.
Nov 12, 2016 at 9:33 comment added D.A.S. low magnet stiction is essential. Remember to convert linear speed to RPM. Put two fans together and see if one can drive the other. If the speed ratio is 1% the voltage best case with NO load is 1%. YOu need to understand the coupling loss ...better
Nov 12, 2016 at 9:22 comment added Ammar Mahadi Thanks a lot for your information. Another thing, if I wanna get output 5V, Do i need 5V motor? or more than 5V motor? @TonyStewart.EEsince'75
Nov 12, 2016 at 9:02 comment added D.A.S. yes motors work as generators with V proportional to RPM but I proportional to torque load so coupling of fan wind energy is difficult without inertia of air such as an open field or roof top or very high speed or very large blades as you know from a paper windmill= with close proximity. A large 2 litre pop bottle is sometimes used as a turbine but the torque is weak without sufficient wind. Wind has poor coupling properties unless you have high wing tip speed . This coupling factor we can model as a high resistance which is difficult to generate useful power is non-linear with wind speed.
Nov 12, 2016 at 8:47 comment added Ammar Mahadi but i want output that is suitable for electronic devices. Does the motor produce DC output? I'm still confused. @Bianca
Nov 12, 2016 at 8:34 comment added Bianca Aha. just don't think too much about today's youtube no-make-sense techie vids. I did with those kind of motor (taken from TAMIYA) on my fifth grade elementary school. It did turns on a LED, but not that bright. Later on, i use motor from bicycle generator, the one that stick to the tire. It is working. The blade size 80 cm.
Nov 12, 2016 at 8:26 comment added Ammar Mahadi how about wind from desk fan? @TonyStewart.EEsince'75
Nov 12, 2016 at 8:25 comment added Ammar Mahadi youtube.com/watch?v=NCGVOdRoDPg .. the size just like in the video. try watching it. @Bianca
Nov 12, 2016 at 8:13 comment added Bianca how "small in size" do you wish ? wind vs blade need space. don't you think of it ?
Nov 12, 2016 at 8:04 comment added D.A.S. not even to power an LED
Nov 12, 2016 at 8:03 comment added Ammar Mahadi @TonyStewart.EEsince'75 i plan to get wind of fan in my room. Is it strong enough to rotate the blade?
Nov 12, 2016 at 7:59 review First posts
Nov 12, 2016 at 11:33
Nov 12, 2016 at 7:56 comment added D.A.S. what wind speed is avail and roof top generator size can you accept
Nov 12, 2016 at 7:52 history asked Ammar Mahadi CC BY-SA 3.0