Harmonic wave produced in the whole grid power driving system has serious influence on the power quality and the safe economic operation of the system.

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.

Discussion on the problem of theory divorcing from practice in present electric drive teaching material of institutions of higher education;

Achieving of PWM machine tool electric drive system based on FPGA and DSP technique;

This article presents the application of IGBT-PWM regulating speed system in machine tool's electric drive.