Abstract: The paper introduces the design of wrapper automatic provision control system using electric transmission mode. The system provides wrapper to the machine with the permanent magnetic DC servo electromotor used as drive source to make the wrapper axis running. The PWM technology is applied to design high efficient drive current. With the single chip processor as the core,the system in the closed-loop technology is used to control the servo electromotor to assure the wrapper is provided placidly according to the properly requirement of the machine.

Key words: wrapper, PWM, single chip processor, control, DC servo electromotor