Comparative Study of Control Concepts for Electrical Trimmable Horizontal Stabilizer Actuator in More Electric Aircraft

Trimmable horizontal stabilizer (THS) is an important surface for flight controls. The actuator driving THS is designed to ensure high reliability and fault tolerance. With the development of more and more electric aircraft, THS has changed from traditional hydraulic drive to electric drive or hybrid drive, and the control method has also changed. By analyzing the system architecture of EHTSA, this paper discussed the transfer function of the system, and derived the control parameters of current loop and speed loop. The overall system model is established in AMESim simulation platform. Through simulation analysis and comparison of control strategies: When the position open-loop and speed closed-loop control mode is adopted, the position of the surface can be controlled by judging whether the command is completed through position feedback, but it is not accurate enough. Using position closed-loop control, although the position response speed increases, the stability decreases.