I have a microcentrifuge which has a DC motor rated 24V, 10 Watt and 7000 rpm.
I have attached one 5W, 500 Ohm potentiometer with it to control the speed and it works fine without heating up.
This microcentrifuge is supposed to be used with a light weight part. But as I need to use it with some large tubes I have 3D printed some parts and attached on the rotor part.
This time with this extra weight my potentiometer becomes very warm within 1 minute.
Is it because of the extra mechanical load or it is something wrong with my potentiometer rating?