Electromagnetic Linear Actuator Idea

G'day all.

I've been trying to think of a silent linear actuator, that is:

   - Quick or slow to move.
   - Offers precise movement.
   - Silent.
   - Run off electricity (ie: not on hydrolics).

I have found this video which looks like the closest to the above requirements:
https://www.youtube.com/watch?v=58o1LxwRmrM

The lovely presenter states a little about the construction: "this is a servo motor unwound with a series of magnets in the slider, and motor windings in the stater".

So here's my idea, and wondering if anyone with more knowledge of electromagnets or linear actuators has any input:


A plastic core with one ring magnet attached to it.
Copper rings of wire, which are able to have voltage applied to them individually.

By turning on different sets of the individual copper rings, this should move the magnet along the core?

Thanks for any ideas on this if you have any.

FR.