Has your hand drill burned out? There is a simple way to restore it and, as it were, simultaneously convert it to a constant voltage of 12 V. It is also quite possible to convert an ordinary working drill to 12 V, not necessarily broken, it just happened that way.
Basically, all 220 V drills have a commutator motor. And very often it fails due to stator combustion. Although the rotor and it have almost the same operating current, the sator burns out more often, since it stands still and has less cooling compared to the rotor.
Converting a hand drill from AC voltage 220 V to DC voltage 12 V
Let's move on to the rework. Let's disassemble the drill. Unscrew the fastening screws and remove the top (side) cover.
We take out the electric motor, remove the rotor from the stator.
We observe a burnt out stator winding. Now you can only throw it away.
We diagnose brushes. When completely worn out they must be replaced. These seem to still serve.
Next, for the modification we will need two pole semicircular magnets.They can be found in similar DC motors, but if not, they can be ordered from Ali Express - http://ali.pub/3wve0j.
We try it on, everything is fine. The magnets do not have to tightly “flow around” the rotor.
We glue the magnets into the case. Two in total, one for each side.
We install the brushes into the mounting grooves.
To check, take a 12 V battery.
We connect and check the operation with only one magnet for now.
Everything is working. Install the button. There is a dimmer in it, which will most likely need to be removed if it does not work.
Connect the power to the plug.
Now the direction of rotation of the drill shaft can be changed by changing the power polarity.
Let's try to drill.
Of course, the drill has lost power if we compare its operation with the previous period at 220V. But it is still quite possible to work and drill with it at a voltage of 12 V. Therefore, this alteration still makes sense.
