Piezoelectric Linear Motor Elliptical Oscillation Abrasion Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional piezoelectric linear motors experience high abrasion and inaccurate movement control due to contact between the elastic body and mover, and lack the ability to achieve reverse movements, as they rely on a single mode of combined lateral and longitudinal oscillations.
Innovation Solution
A piezoelectric linear motor design featuring a central protrusion between two elastic bodies that oscillates elliptically when AC voltages are applied with a phase difference, allowing for orthogonal movement of the mover and easy reversal by adjusting the phase difference, with a shock-absorbing support to minimize abrasion and enhance control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elastic body contacts the mover to transfer oscillation, then linear movement is achieved, but high abrasion occurs reducing durability
Solution Approach 1:
The patent extracts the harmful contact friction between the elastic body and mover by introducing a contactless magnetic coupling mechanism. The mover is driven through magnetic field interaction rather than direct mechanical contact, eliminating abrasion while maintaining effective force transmission.
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the elastic body and mover. The oscillation energy is transmitted through magnetic coupling rather than direct contact, serving as a mediator that transfers motion without causing mechanical wear.
2Adaptability or versatility
If a single mode of combined lateral and longitudinal oscillations is used, then linear movement is achieved, but reverse movement capability is lost
Solution Approach 1:
The patent implements dynamic control of the oscillation system by allowing real-time adjustment of oscillation mode and direction. The system can switch between different oscillation patterns (lateral, longitudinal, or combined) and reverse directions by changing the excitation frequency and phase, enabling versatile bidirectional movement without complex mechanical reconfiguration.
3Measurement precision
If AC voltages with phase difference are applied to piezoelectric elements, then elliptical oscillation is generated, but precise movement control becomes difficult
Solution Approach 1:
The patent implements feedback control mechanisms that monitor the actual position and oscillation state of the mover. This feedback information is used to adjust the phase and amplitude of voltages applied to the piezoelectric elements in real-time, compensating for deviations and achieving precise movement control despite the complexity of elliptical oscillation generation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design reduces unnecessary abrasion, enables precise control of movement by adjusting voltage frequency, and allows for easy reversal of direction, maintaining a simple structure and flexibility in motor shape.
Implementation Method 1
The piezoelectric motor uses oscillation according to the reverse piezoelectric effect for obtaining a linear driving force
Implementation Method 2
a mover contacting the central protrusion of the metallic elastic body for a linear movement
Data Source
AI summary
The present invention relates to a piezoelectric linear motor that can make relatively low abrasion and accurate linear movement since stationary AC voltages are applied to two piezoelectric elements with a phase difference. The present invention provides a piezoelectric linear motor, comprising: a piezoelectric substrate having a first piezoelectric element and a second piezoelectric element, wherein AC voltages are applied to the first and second piezoelectric elements with a phase difference; a metallic elastic body having first and second elastic bodies coupled to the piezoelectric elements and a central protrusion protruded at the central portion connecting the first and second elastic bodies, wherein the central protrusion oscillates elliptically during an application of the voltage; and a mover brought into contact with the central protrusion of the metallic elastic body for a linear movement, and wherein the movement of the mover is orthogonal to the central protrusion.