Dynamo flashlight from stepper motor

Dynamo flashlight from stepper motor

Now a lot of digital equipment is breaking down, computers, printers, scanners. Time is like this - the old is replaced by the new. But equipment that has failed can still serve, although not all of it, but certain parts of it for sure.
For example, stepper motors of various sizes and powers are used in printers and scanners. The fact is that they can work not only as motors, but also as current generators. In fact, this is already a four-phase current generator. And if you apply even a small torque to the engine, a significantly higher voltage will appear at the output, which is quite enough to charge low-power batteries.
I propose to make a mechanical dynamo flashlight from a stepper motor of a printer or scanner.

Making a flashlight


The first thing you need to do is find a suitable small stepper motor. Although, if you want to make a flashlight larger and more powerful, take a large engine.
stepper motor

Next I need a body. I took it ready. You can take soap dishes, or even glue the case yourself.
Frame

We make a hole for the stepper motor.
Dynamo flashlight from stepper motor

We install and try on the stepper motor.
Dynamo flashlight from stepper motor

From an old flashlight we take the front panel with reflectors and LEDs. Of course, you can do all this yourself.
Dynamo flashlight from stepper motor

We cut out a groove for the headlight.
Dynamo flashlight from stepper motor

We install a luminary from an old flashlight.
Dynamo flashlight from stepper motor

We make a cutout for the button and install it in the groove.
Dynamo flashlight from stepper motor

In the free area we place the board on which the electronic components will be placed.
Dynamo flashlight from stepper motor

Flashlight electronics


Scheme


To LEDs they need direct current. The generator produces alternating current, so a four-phase rectifier is needed that will collect current from all motor windings and concentrate it in one circuit.
Scheme

Next, the resulting current will charge the batteries, which will store the resulting current. In principle, you can do without batteries - using a powerful capacitor, but then the glow will only appear at the moment the generator is turned.
Although there is another alternative - to use ionistor, but it will take considerable time to charge.
We assemble the board according to the diagram.
Dynamo flashlight from stepper motor

Dynamo flashlight from stepper motor

All parts of the flashlight are ready for assembly.
Dynamo flashlight from stepper motor

Lantern dynamo assembly


We attach the board with self-tapping screws.
Dynamo flashlight from stepper motor

We install the stepper motor and solder its wires to the board.
Dynamo flashlight from stepper motor

We connect the wires to the switch and headlight.
Dynamo flashlight from stepper motor

Here is the almost assembled lantern with all the parts.
Dynamo flashlight from stepper motor

Completely close the housing. An “L”-shaped handle is attached to the generator wheel, with which the user will rotate the engine shaft.
Dynamo flashlight from stepper motor

What the finished flashlight looks like.
Dynamo flashlight from stepper motor

This is how it shines.
Dynamo flashlight from stepper motor

There is enough energy to charge miniature batteries. The entire design is small in size and easily fits into a pocket. This flashlight is good because even after lying for years without use, it can start working again in a matter of minutes.

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Comments (2)
  1. Vl
    #1 Vl Guests April 21, 2018 05:22
    6
    Conder swollen
  2. Guest Nikolay
    #2 Guest Nikolay Guests April 21, 2019 11:39
    2
    I have a motor from the printer. There are only 4 contacts. Where can I get the fifth one (which is M)?