Your idea is not impossible, but there is one thing: you must have enough speed to generate enough wind power, and if you think about it, it will be very eye-catching if the fan is installed outside, and the extra part will affect your mountain bike. The overall image is unreliable. What if it’s not a headwind? If it's a tailwind, your fan needs to be equipped with a tail that can rotate 360 degrees and turn to the windy side at all times. This is too cumbersome! ·······Give you a brand new design idea that I came up with: generate electricity through the wheel axle, directly connect the rotor of the generator to the axle of your front wheel, so that when your mountain bike wheel rotates, it will provide power to the generator. The generator starts to generate power. It is best to add a small battery, so that the electricity in the battery will light up your car lights as long as you ride for a period of time during the day! This is much simpler and more reliable than a fan. Hope this helps! !
How to make a generator from a fan?
Whether the wind turbine rotates clockwise or counterclockwise depends on the shape of your wind blade, which determines the direction of motor rotation;
On the other hand, the small motor should generate DC power Yes, the direction of rotation determines the direction of the generated voltage and current;
So it ultimately depends on the end of your power use (generally there are high and low voltages, simply speaking, positive and negative poles). Determine the direction of voltage and current, such as used to store energy, light up light bulbs, etc.
In fact, when you turn the rotor to a certain speed, there will be electricity (induced current).
You can also disassemble the motor from the electric toy car, connect a small light bulb to the positive and negative terminals of the motor, and then turn the rotor of the motor hard, you will find that the light lights up.
If you are making a small generator (providing a set of small LED lights), I suggest you use a DC motor fan motor, because it is simpler (the direction of the generated current will not change).
But to make a motor, you need power to drive the generator to rotate, so you have to find another motor or other machine to drive the generator, which is quite troublesome. You might as well just find a transformer to convert the 220V AC power into the rated voltage of the LED.
If you just want to make some small inventions as a personal hobby, just follow what I said above.
Actually, I have done something similar before out of curiosity, but at that time I used the motor of a toy four-wheel drive. The above is just personal experience, I hope it will be helpful to you!
I wish you success!