Digital synchronous follow-up system

This paper describes a synchronous follow-up system whose dynamic phase error is less than or equal to 200, while its steady-state phase error is less than or equal to 20, with a load torque of 5600 g.cm on the shaft of the servomotor. The digital system ensures a range of regulation of 3.10 and a factor of merit of 1200 sec-1 at a tracking speed of 200 rad/sec. This system is especially applicable to the fabrication of superconducting cables during which a high level of accuracy is required in the pitch of the twist applied to the cores of superconducting cables