I have a project where I would like to use an electromagnet to lift an item for a longer period of time. I was looking at a magnet like this one:
Problem is that seller states that it should not be used for more than 5-10 minutes at a time (without severe reduced lifespan). I would like a magnet that could stay on for an hour at a time at least and lift/hold maybe 20kg. Is this possible?
I was thinking that one might be able to do this by getting a significantly larger magnet than required and powering this on a lower voltage than specified to avoid it burning out (less current going through the coil), but this is just a guess on my part.