Development and control experiments of low-impact high-frequency variable-stroke reciprocating linear actuator
Abstract
Linear actuators represent an important category of contemporary electromechanical devices, which are widely use d in industrial automation, medical equipment, household appliances, and automotive fields. This paper proposes an electromagnetic-mechanical coupled linear actuator characterized by low impact, high operating frequency and high-precision displacement control. Based on the Euler-Lagrange equation, a dynamic model of the mechanical transmission component is established, and the equivalent moment of inertia and driving torque of the mechanical transmission can be calculated. The electromagnetic characteristic s of the electromagnetic drive module are obtained via finite element simulation. Moreover, a closed-loop control strategy for the proposed electromagnetic-mechanical linear actuator (EMLA) is constructed combining PID control, feedforward compensation and dynamic parameter tuning. Experimental results demonstrate that the EMLA system exhibits excellent positioning capability, low velocity at the end of motion, and stable continuous operation under various operating modes, with a positioning error of less than 0.24 mm and a velocity of less than 0.2m/s at the end of motion.