I am using a DC motor to raise this desk that I purchased on amazon.
I first purchased this DC motor that was capable of lifting the desk. This DC motor costs almost $40 dollars and it is very slow! I know it is slow because it is a trade off between torque and speed.
Because it was so slow I started using my electric drill to raise/lower my desk. As a result I replaced that slow motor with the motor of the drill. It now looks like this:
The electric drill costs the same amount of money than the DC motor that I purchased and it is 5 times faster with the same amount of torque! Because I was not able to find a DC motor with the same amount of torque I ended up buying the electric drill instead of a DC motor.**
Anyways maybe someone can point me on the right direction on where to buy a DC motor that has the same torque and RPM as my electric drill so that in the future I do not have to do all this trouble.
Everything worked amazing at the beginning. Now one of the batteries of the drill has stopped working and I am guessing the other battery will stop working soon too because its life keeps getting shorter. I believe the reason is because the batteries are drawing too much current. I know I can limit the amount of current by placing some resistance. If I place resistance then the motor will not have enough strength to carry the desk. The battery gets hot and that is another sign why I may be drawing a lot of current.
This question states that is dangerous to draw a lot of current (amps) from a battery: What happens if you draw too much current from a 12 volt sealed lead acid battery?
These are my solutions please help me determine the best one.
Use the first DC motor that I purchased that is too slow. With this solution I can place resistance to the battery and very little current is drawn. The battery life is way longer. I would like to discard this solution because it takes forever to raise the desk.
Purchase the same 12V batteries that come with the electric drill. Instead of using one at a time use them in parallel. If I use the batteries in parallel I will be drawing half of the current on each thus making it safer? Should I purchase 4 to be even safer?
Purchase a 24V battery and a 5 Ohm 100W resistor. Maybe if I increase the voltage the DC motor will have more strengh to lift the table. If I have double the strength then maybe I can use some resistance to limit the current?