The circular fixation modes and their features of drive parts in antenna pedestal system of radar are analyzed in terms of some typical design examples of the system.

[Objective]To analyze Finite element of biomechanical property of four different Fixation techniques of sacral screw, to provide powerful basis of theory and practice for selecting the best fixation techniques of sacral screw and directing clinical restoration and reconstruction the stability of spine .

The paper analyzed and compared the features, including orientation methods, torque response time, switching frequency, torque pulse and magnetic-chain pulse, an calculating amount of work, for between the double systems of VC and DTC on base of "The comparison testing report for the characteristics between Vector control and direct torque control of the general inverters".