In order to solve the problem of the mechanical arc sensor for seam-tracking,a new type of magnetic-control arc sensor was developed,and its mechanical structure and the correlative circuit diagram were given.

Aimed at some problems of the mechanical arc sensor for seam-tracking,the magnetic-control welding arc technology is applied to seam tracleking,a new type magnetic-control arc sensor and a system structure with two sets of crossed slides are designed.

In order to solve some problems of the sensor for seam-tracking,applied the magnetic-control welding arc technology,developed a new type magnetic-control arc sensor,it s basic principle was analyzed,and mathematic model was built,the main parameters were analyzed,that provided academic foundation for the application of the magnetic-control arc sensor.

A sliding-mode speed and flux control strategy of the speed sensorless induction machine in synchronous rotating coordinate and a closed-loop flux observer with adjustable convergence rate are presented.

The method for high efficiency and fast flux control of direct field oriented induction motor drives has been proposed that employs predicted flux.

The work principle and structure of a flux control power amplifier were analyzed and a flux control power amplifier based on a flux observer was proposed.

Study on Large Capacity Adjustable Reactor Based on Magnetic Flux Controlling;

In this dissertation, an adjustable reactor, which works on the principle of magnetic flux control, is deeply analyzed theoretically and technically on the basis of comprehensively summarizing the present development in adjustable reactors at home and abroad, especially, the study on the application of this reactor to the arc-suppression coil is emphasized in the paper.