Now a lot of digital technology fails, computers, printers, scanners. Time is - the old is replaced by the new. But the failed equipment can still serve, although not all, but its individual parts are for sure. Here, for example, stepper motors of various sizes and capacities are used in printers and scanners. The fact is that they can work not only as engines, but also as current generators. In fact, this four-phase current generator is already there. And if you attach even a small torque to the engine, a much higher voltage will appear at the output, which is enough to charge low-power batteries. I suggest making a mechanical dynamo flashlight from a stepper motor of a printer or scanner.
Making a flashlight
The first thing to do is find a suitable stepping motor of small size.Although, if you want to make a flashlight bigger and more powerful - take a big engine.
Next I need a body. I took ready. You can take soap trays, or even glue the case yourself.
Making a hole for the stepper motor.
Install and try on a stepping motor.
From the old flashlight, we take the front panel with reflectors and LEDs. All this can of course be done by yourself.
Cutting out the groove for the headlight.
Install the light from the old flashlight.
Make a cutout under the button and set it into the groove.
We place a fee in the free area,where electronic components will be placed.
In order for the LEDs to light, they need direct current. The generator produces a variable, so you need a four-phase rectifier that will collect current from all motor windings and concentrate it in one circuit.
Next, the resulting current will charge the batteries, which will store the received current. In principle, you can do without batteries - using a powerful capacitor, but then the glow will be only at the moment of the generator torsion. Although there is another alternative - to use an ionistor, but it will take a long time to charge it. .
All parts of the flashlight are ready for assembly.
Attach the board to the screws.
Put the stepper motor and solder its wires to the board.
Connect the wires to the switch and the spotlight.
Here is an almost assembled flashlight with all parts.
Completely closing the case. A “G” -shaped handle is attached to the generator wheel, for which the user will rotate the motor shaft.
What a finished flashlight looks like.
This is how it shines.
It is quite enough energy to charge miniature batteries. The whole structure is small and easily fits in your pocket. This flashlight is good because even having lain for years without exploitation, it can earn in few minutes again.