in the system of selsyn

PANG Bo1，HUANG Xing-cheng2

（1. Military Affairs Office of Navy in Hangzhou Area，Hangzhou 310012，China；

2．Zhijiang College，Zhejiang University of Technology，Hangzhou 310024，China）

Abstract：Aiming at the problem of detection of angular position in one position servo control system，the key components in the channel of detecting angular position and the software of synthesis angular position of the coarse and fine channels were analyzed. The selsyn converter SDC 17xx and DSP type of TMS320LF2407 were used in the position feedback detection circuit of the practical servo control system to establish circuit interface relationship between DSP，the mode of synthesis of coarse and fine angles was adopted，based on analyzing and summarizing，a new practical formula was presented instead of theoretical one to eliminate the theoretical synthesis error. Through the collection of the coarse and fine positions timely and the coarse and fine position synthesis of the digital signals with practical formula by DSP，the exact detection of the angular position was achieved. The results indicate that reducing cost and improving reliability can be realized with simple software compute instead of complex hardware design.

Key words：selsyn；coarse and fine position synthesis；angular position；servo control system