@tubetime That's actually a pretty old system. Way back Harrison already used an automatic rewind system to minimize the difference in rate due to different winding status. Of course, he used weights to drive that, but still.

"Modern" electromechanical pendulum clocks all used a similar system, driven by electromotors. If you go to a clock museum, you will find plenty of those. Later models would use solenoids to directly drive the pendulum, in order to increase the Q factor.