Bicycle generator from a stepper motor

A stepper motor is not only a motor that drives various devices (printer, scanner, etc.), but also a good generator! The main advantage of such a generator is that it does not need high speeds. In other words, even at low speeds, the stepper motor produces quite a lot of energy. That is, a regular bicycle generator requires initial revolutions until the flashlight begins to shine with bright light. This disadvantage disappears when using a stepper motor.

In turn, the stepper motor also has a number of disadvantages. The main one is large magnetic sticking.

Anyway. First we need to find a stepper motor. The rule works here: The larger the engine, the better.

Here I will introduce you to a couple of mounting options and a couple of stepper motor options.

Let's start with the biggest one. I tore it out of the plotter for printing, it's such a big printer. The engine looks quite large.

Before showing you the stabilization and power diagram, I want to show you the method of attaching it to your bike.

As can be seen from the figure, our generator is screwed closer to the wheel axis and rotates from an additional circle. Here you need thought and ingenuity, each of you needs to come up with a mount and a circle of rotation yourself, since there are a lot of options.

Here is another option with a smaller engine.

Details:

I think each of you will choose the most suitable option for him when building.

Well, now it’s time to talk about lanterns and power circuits. Naturally, all lights are LED.

The rectification circuit is conventional: a block of rectifying diodes, a pair of high-capacity capacitors and a voltage stabilizer.

Typically there are 4 wires coming out of the stepper motor corresponding to two coils. Therefore, there are two rectifier blocks in the figure.

Our generator is capable of generating up to 50 volts of voltage at high speeds, so capacitors must be taken for a voltage of at least 50.

And the stabilizer is for a voltage of 5-6 volts.

What's so good about our homemade product?! - The fact is that even when moving away, our flashlight shines brightly! And during the movement it does not flicker or go out.

That's all !

come back

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Comments (23)

#1 mailz Guests October 6, 2010 12:55
3

Could you please indicate what radio components are needed? I’m not good at electronics...
- Answer
#2 dimansid Guests 6 October 2010 14:37
0

If you are not strong in electronics, then I advise you to ask someone. Well, if specifically about the details: any diodes with a current of 100 mA, and it is better to use a diode bridge. Capacitors with a voltage of more than 50 volts and, accordingly, a capacity of 4800 µF. Stabilizer chip for stabilization current 5 Volts. Parts without loss are replaced with analogues and there are no specific restrictions.
- Answer
#3 mailz Guests 6 October 2010 15:11
1

Thank you.
- Answer
#4 [)eNiS Guests 14 October 2010 19:32
2

Or you can simply put a multiplier instead of the circuit. Let’s say ~6V comes out of the generator and goes to the multiplier and 12V comes out from there. I just don’t know whether the current strength changes or not((.
- Answer
#5 TRP Guests 20 October 2011 18:09
1

What nonsense... what multiplier?...
- Answer
#6 TRP Guests 20 October 2011 18:20
1

The stepper option is really good. Tested back in the 90s. It is better to transmit rotation closer to the wheel axis (lower engine speed, less noise, less dirt, and the figure eights on the wheel do not affect the rotation of the generator). The first version of the engine as a generator (first and second photos) is preferable... less “magnetic sticking”, rotates more smoothly.
- Answer
#7 Levsha Guests 10 March 2012 20:30
1

yes on a stepper motor... convenient. and most importantly, it turns out durable.
- Answer
#8 self-taught Guests 18 June 2012 20:51
2

Stepper motors are built on eternal bearings. They are made from obsidan, brass-plated zinc alloy ball carriers. Nowadays, bushings for hard drives are made from obsidan, an eternal wear-resistant metal, but very expensive, more expensive than gold. By the way, there is a voltage multiplier; from 1.2 volts it makes 15 volts.It’s almost impossible to get it, but I know I read somewhere in radio magazines that it was installed on electronics microcalculators 7-12 models; it also worked from the power supply network. 15 volt small from a 1.5 volt battery with a voltage multiplier of 15 volts.
- Answer
#9 Vitali Guests October 10, 2013 03:22
0

I did it, it's a neat thing
- Answer
#10 Yasha Guests November 6, 2013 22:35
1

type in a search engine: voltage multiplier and it will give you everything there on the conders it’s all about
- Answer