Research on A Position Servo Control Method of Aircraft Cargo Door Based on PMSM

In this paper, a three-loops position servo control method of a permanent magnet synchronous motor (PMSM) for a large aircraft cargo door actuator system (CDAS) is designed to improve the fastness and robustness of the system.First, an adaptive filter is designed, and the weight of the filter is adjusted by a normalized minimum mean square (NLMS) filter algorithm, so that the transfer function of the filter is approximately equivalent to the inverse model of the current loop of the controlled motor, and the output of the filter is used as compensation of torque feedforward to reduce the impact of external load disturbances on the system. Because it does not rely on the error of the controlled variable, the feedforward control can quickly compensate for external disturbances. Thus, it can effectively improve the fastness and robustness of the electromechanical actuation system of the cargo door.In addition, an algorithm based on trigonometric function for position curve and speed curve planning is designed. The position planning curve is used as the input of the position loop, and the speed planning curve and the controller output of the position loop are used as the input of the speed loop. Compared with the piecewise S-curve function as the position planning and speed planning curve, this method has better tracking effect, smaller overshoot and tracking error, and smaller peak phase current. Simulation results verify the effectiveness of the method.

I. Introduction

Cargo doors actuation system is an important part of the aircraft. It has the functions of interaction with the aircraft avionics system, data acquisition, door signal processing, and control of door opening and closing. Its stability and reliability directly affects the operational safety of the aircraft.