I'm trying to study the difference between a simple solenoid coil and one that will change position with voltage. It looks like they work in the same way of a speaker.
I've seen expensive professional cylinder linear actuators, but I don't have one to take apart to see whats inside.
What I want to make is a 6" long rod, that I can control the length/position of - magnetically, instead of using a ballscrew or belt drive type motor (or anything else that makes physical mechanical noise). I'm trying to raise and lower a rod connected to a small trombone style home made musical instrument.
I was hoping I can just wind a long coil and apply a variable voltage or current to it to move the position of the rod. I know hard-drive actuators for the heads, work in this same way - they are very fast and accurate, and make pretty much zero noise. I also seen how mag-lev linear motors work, which are a very complicated series of coil windings placed in a precise array - this is way too complex for my skills I do not want to do that. I just want to know more about a 1-coil winding.
So I was hoping if someone here had some knowledge more then I've done so far, for some advice or links on making my own simple positioning coil linear motor.