Fast-Response Electric Servo System

The electric servo system becomes the tendency of servo system for its compactness, fast response and reliability. Brushless DC motor (BLDC) is suitable to be execution motor in actuator servo system for its excellent dynamic and control nature. The fast-response electric servo system based on BLDC was studied in this paper.Firstly, overall planning of electric servo system was presented on the basis of analyzing the whole system. BLDC was chosen as execution motor for its meeting the necessity of the system nature in comparison with other kinds of motor. Accurate mathematic model was established for system emulation and control. Hardware and software program were also analyzed. Self-detection scheme was adopted to improve the reliability of the system.Secondly, software and hardware conformations of the system were designed. Servo system was established with TMS320LF2407A as the processor. IR2130 chip was chosen as the core of driven circuit,and bootstrap circuit was adopted to guarantee the credibility. Detection and interface circuit was added. Electromagnetism compatible problem was analyzed in hardware conformations.Thirdly, load characteristic was analyzed which decides the conformations and control strategy of the system. The dynamic nature of the system was analyzed, and the influence of motor itself and speed sensor were compared.Finally, the servo system was tested and debugged. The speed signal was analyzed, time constant and regulator parameter were achieved which verified the system validity.