Chaos Control in Brushless DC Thruster Motor of Deepwater Robot Based on Fuzzy Control

The problem of the delay-time parameter difficult to be determined in controlling chaos was considered in this paper. The quadrature-axis stator voltage was used as the manipulated variable. Applied the fuzzy control method into chaotic control by time-delayed feedback. The input of the fuzzy controller was the difference between the feedback of output and the set value of system. Fuzzy controller searched the optimum time parameter according to the error. After received the optimum parameter, the brushless direct current thruster motor of deepwater robot became a controlled system from chaotic state to a regular motion by using time-delay feedback control. The motion stabilized at a predetermined orbit by automatic tracing set-value of exterior. The simulation results show that the control method is effective.