Modeling and dynamic characteristics experiment of novel linear oscillating motor

According to the proposed new principle of directly-driven hydraulic serve pump, a novel short stroke permanent magnet linear oscillating motor (LOM) was designed. The LOM working principle based on minimum reluctance rule was elaborated, and a special hollow mover design structure employing Halbach PMs array was adopted to improve the motor dynamic response ability and facilitate the installment of resonant springs. The lumped parameter mathematical model and transform function of LOM was established by Matlab/Simulink. Through sinusoidal voltage frequency sweep excitation, the LOM frequency characteristics of current with no load and of efficiency with constant load was acquired. According to the motor model, a dual-loop control structure with current loop and position loop was designed to improve the current frequency response and position tracking performance. Finally, the LOM experiments for unloaded resonance and dual-loop control strategy were carried out. The experimental results are coincided with the simulation results basically and verify the effectiveness of LOM model and control structure.