多足并联型压电电机的柔性定子设计

Design of an Adaptive Stator for Bundled Piezo-walk Motors

并联压电电机采用多个压电致动器提高电机输出功率,但由于驱动器间相互干扰,导致输出效率下降。该文提出了一种由簧片和质量块组成的柔性驱动足定子结构,可降低并联直线电机中致动器间的相互干扰。建立驱动足的接触振动模型,并分析各参数对输出性能的影响。设计并制作电机样机,实验结果表明,电机的输出力随着预紧力增大而增大,激励电压峰-峰值为30 V时电机的最大输出力可达1.8 N。激励电压越大,电机的最大输出力越大。通过六足和四足电机的负载特性测试对比,证明了每个驱动足都可有效作用于滑轨上,驱动足间的相互干扰降低,输出效率提高,且电机的输出力可随着驱动足数量的增大而线性增大。

The bundled piezoelectric motors combine several actuators together and improve the output power considerably.However,the working efficiency decreases due to mutual interference between actuators.This paper presents a adaptive driving foot stator structure consisting of leaf springs and proof masses to reduce the mutual interference between actuators in the bundled linear motors.The contact vibration model of driving foot is established and the influences of various parameters on the output performance are analyzed.A prototype of linear motor is designed and fabricated.The experimental results show that the output force of the motor increases with the increase of pre-loading force,and the maximum output force of the motor can reach 1.8 N when the peak-peak value of the excitation voltage is 30 V.The larger the excitation voltage is,the greater the maximum output force of the motor is.Through the comparison of the load characteristics of the six-legged and four-legged motors,it is proved that each driving foot can effectively act on the sliding rail,the mutual interference between the driving feet is reduced,the output efficiency is improved,and the output force of the motor can increase linearly with the increase of the number of driving foot.