Abstract:Active side-stick (ASS) has become a research hotspot. It can provide force feedback to simulate the function of spring with stick-force changing with stick angle, and it can automatically return to the neutral position.The aircraft’s active side-stick is equivalent to a massless spring-damping system to solve the problem about simulating spring control, using permanent magnet synchronous motor as a torque motor. The torque motor is controlled by the PI current loop. The reference value of the quadrature axis current is obtained from the side-stick angle-force characteristic curve and the damping characteristic to output the corresponding torque according to the stick angle. A strategy for returning to the neutral position is adopted to change the control reference value according to the different deflection angles of the side-stick. The simulation and experimental results show that this control strategy can realize simulating the spring control of active side-stick, and the force feedback has high precision and stability, and the rapidity and accuracy of the side-stick for returning to the neutral position can be ensured.