Bipedal driven inertial type piezoelectric motor working under quasi-static and resonant states

压电马达 压电 惯性 振动 虚拟力 定子 固有频率 声学 锯齿波 超声波电动机 物理 惯性参考系 共振(粒子物理) 工程类 控制理论(社会学) 机械 电气工程 经典力学 计算机科学 粒子物理学 人工智能 控制(管理) 电信
作者
Qiaosheng Pan,Mingfei Zhao,Yifang Zhang,Chen Li,Chunli Zhu,Shanlin Liu
出处
期刊:Smart Materials and Structures [IOP Publishing]
卷期号:32 (6): 065017-065017 被引量:3
标识
DOI:10.1088/1361-665x/acd093
摘要

Abstract An inertia piezoelectric motor based on bipedal driven, which can work in not only quasi-static but also resonant states, is proposed, designed, fabricated and studied considering the high resolution of quasi-static piezoelectric motor and the high speed of resonant piezoelectric motor. The two stators of the piezoelectric motor are drived by two sinusoidal electrical signals with 1:2 frequency ratio to generate sinusoidal vibration on the corresponding driving foot. A continuous step motion without frequency limitation is realised under the action of inertia and friction forces after synthesising the sinusoidal vibration of different frequencies into mechanical sawtooth vibration. The natural resonant frequencies of the piezoelectric motor are adjusted to a specific proportion to combine the vibrations in the resonant state through finite element analysis. In the structure of two stators, each stator has a corresponding inertia block, and the corresponding resonant frequency can be altered by adjusting the mass of the inertial block without affecting the other resonant frequency, thus markedly simplifying the design difficulty of the piezoelectric motor which can work in quasi-static and resonant states. The motion characteristics of the prototype are tested by building the prototype and experimental platform. Experimental results show that the maximum speed of the prototype is 29.3 mm s −1 and the maximum load is 2 N in the resonant state, the minimum displacement resolution of prototype motor is 0.26 μ m in the quasi-static state. The motion characteristics of the prototype are consistent with the theoretical analysis, which provides an effective idea to improve the comprehensive performance of the piezoelectric motor.
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