Fast resonant frequency tracking strategy of linear oscillatory motor based on gradient descent method

Abstract Recently, scholars have conducted many studies on the linear oscillatory motor, which is the core driver of linear compressors due to the LOM’s simple mechanical structure and high efficiency of energy conversion. According to its special frequency system characteristics, the compressor system can reach maximum efficiency when the motor works at the system’s resonant frequency. In this paper, to achieve resonant frequency tracking and ensure a quick response speed, a gradient descent method with discretizing the displacement and speed of the motor is raised. The simulation results verify the rapidity and effectiveness of the proposed method.