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提出一种可应用于介观尺度零件精密加工进给的螺杆型直线压电作动器,该作动器定子与转子通过精密螺旋副相啮合.首先,建立了该直线压电作动器定子的有限元计算模型;然后,运用ANSYS软件进行了模态分析和谐响应分析,讨论了结构参数对定子谐振频率及振幅的影响,得出了一般规律;最后,根据定子优化设计结果制作了实验样机和专用驱动电源.实验结果表明:该作动器具有较好的输出性能,在电压峰峰值为300 V、驱动频率为16kHz的情况下,其最大空载速度为24 mm/s,最大输出力为6 N,基本可以满足介观尺度对象车铣复合加工对于驱动力和进给速度的要求.
A screw-type linear piezoelectric actuator which can be applied to the precision machining feed of mesoscopic scale parts is proposed, in which the stator of the actuator is meshed with the rotor through a precision helical pair.Firstly, the linear piezoelectric actuator stator Then the ANSYS software is used to analyze the modal analysis and harmonic response. The influence of structure parameters on the resonance frequency and amplitude of the stator is discussed. The general rule is obtained. Finally, the experimental prototype is made according to the results of stator optimization design And a special drive power.The experimental results show that the actuator has good output performance, the maximum no-load speed of 24 mm / s at a peak voltage of 300 V and a driving frequency of 16 kHz, the maximum output force Is 6 N, which basically meets the requirements of driving and feeding speed for turning and milling of mesoscopic objects.