Is it possible to make an electromagnetic muscle fiber?

Question

Batteries

I asked myself: why can't I find projects anywhere where electromagnets are used for flexion / extension of the shoulder?
Roughly speaking, we have a bunch of electromagnets, where the cores are connected to each other by a hinge, like this:

In general, it turns out that we have one bunch for flexion, the other for extension. Why is this technology not used anywhere and I found only a couple of videos https://www.youtube.com/watch?v=qwo5lQytBoA

Answer 1

In general, it is possible to do it, but doing it well is already more difficult. Because efficiency, size and non-linearity, I guess.
Much more promising are all kinds of polymer and thin-film "artificial muscles", of which there are already dozens or hundreds in laboratories.
But the industry is still dominated by motors, gears and belts. Because they have a higher price / quality / reliability ratio.
https://www.youtube.com/watch?v=mADNlV1yCSo

Answer 2

that is, to keep the muscle in a tense state, you need to constantly apply a certain amount of energy? Don't you think that the servo is a little ... more economical? )

Answer 3

The force of attraction between magnets increases very rapidly as they move closer and decreases as they move away. As a result, such systems are difficult to manage. In addition, for control it is necessary to switch large currents, which also does not contribute to the simplicity of design.