Tension control method for multi-tension continuous coating equipment in high vacuum environment

The invention relates to a tension control method for multi-tension continuous coating equipment in a high vacuum environment, which comprises the following steps of: firstly, setting front and back process target tension SV of each power roller, then establishing an electronic imaginary axis, setting the rotating speed V0 of the electronic imaginary axis, and coupling a motor rotating shaft of each power roller to the electronic imaginary axis by taking the rotating speed V0 of the electronic imaginary axis as a standard rotating speed, when film feeding is started, the rotating speed Vn of each power roller and the front and back process current tension PV of each power roller are obtained in real time, the process current tension PV and the process target tension SV are compared in real time, the electronic gear ratio R is adjusted through the PID controller, and then the rotating speed Vn of each power roller is adjusted; the base film tension in the technological process is kept constant by keeping the d