The relation of the tension with strip tension torque,friction windage torque and dynamic torque was analyzed by using the principle of DC motor drive,and a mathematic model for tension control was set up.

This paper analyzes the mechanical characteriseics of YD range of pole-changing adjustable-speed motors with Y/YY connections, and gives suggestions based on analyzing different methods for drawing mechanical characteristics, which have some reference for both scientific research personnel being engaged in motor drive and user.

It can serve as an important element in control circuit of motor drive.

Applying double motor drive technology is the best way to solve this problem, which can reduce the flywheel of the motor.

Being against the actuality of the electric motor and driving course,and combining the building of top quality courses in our school,this paper presents adding content of PLC controlling based on electric motor and driving courses,and exploring the new teaching mode and teaching content in existing.

The teaching method in the course of electric motor and driving is studied.

From the current state of the course of electric motor and driving, the author suggest to feform the current used teaching materials, enhance the teaching of electromagnetic theory and mechanical fundamentals, provide enough experiments and training and build a pratical and comprehensive laboratory for to foster the creative spirit of stadents and to raise the practical ability of students.

For the purpose of adapting higher educational development and social demand, we take an attempt reform on experimental teaching in the subject of electric machinery and drag, and put forward the four goals of the experimental teaching,and prominent emphasis on formatting students original consciousness and creative ability.