新型动磁式直线振荡执行器的谐振频率跟踪控制

Resonant Frequency Tracking Control of Novel Moving-Magnet Type Linear Oscillatory Actuator

针对一种新型无内定子动磁式直线振荡执行器,在建立其机电系统数学模型的基础上,采用矢量法分析其谐振特性。结果表明,当运行频率等于等效机械谐振频率时,执行器系统效率最高,此时电流位移相位差必定为90°。在动子位移子自传感算法的基础上,建立了基于电流位移相位差法的谐振频率跟踪控制系统。仿真结果证明,该算法能较好实现执行器变工况运行时的谐振频率跟踪控制,使系统保持高效率运行。

Aiming at a novel moving-magnet type linear oscillatory actuator, the mathematical model of the actuator electromechanical system was established and the resonant characteristic was analyzed. The results show when the operating frequency is equal to the mechanical resonant frequency, the actuator has the highest efficiency, and the phase angle difference between the current and displacement is 90o. Combined with the mover displacement estimation method, the resonant frequency tracking control system was proposed, which is based on the phase angle difference method. The simulation results show that this resonant frequency tracking strategy can adjust the operating frequency of the actuator to the varied resonant frequency, which makes the actuator operate with high efficiency.