Piezoelectric Drive Vibration Control via Elastic Damping
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Solution Overview
Problem
Piezoelectric drive devices suffer from unnecessary vibration and poor energy conversion efficiency due to the holding portion vibrating along with the vibrator, leading to loss of drive output, abnormal noise, and premature wear of the projecting portion.
Innovation Solution
Incorporating an elastic portion and a weight portion on the holding portion of the piezoelectric drive device, positioned between the holding portion and the weight portion, which function as dynamic vibration absorbers to reduce unnecessary vibration and enhance energy conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the holding portion directly holds the vibrator without vibration reduction measures, then the structure is simple, but unnecessary vibration is generated causing energy loss and abnormal noise
Solution Approach 1:
The patent introduces an elastic portion as an intermediary element between the holding portion and the vibrator. This elastic portion serves as a vibration isolation mediator that reduces the transmission of unnecessary vibration from the vibrator to the holding portion, thereby improving energy conversion efficiency while managing structural complexity through a relatively simple added component.
Solution Approach 2:
The patent converts the harmful vibration that causes energy loss into a beneficial effect by using the elastic portion to generate beneficial elastic forces. The elastic portion deforms under vibration and generates restoring forces that help stabilize the system, transforming the harmful vibrational energy into useful elastic mechanical energy that supports the vibrator while reducing unwanted vibrations.
2Reliability
If the holding portion directly holds the vibrator, then the structure is simple, but abnormal noise and earlier wear of the projecting portion occur
Solution Approach 1:
The elastic portion acts as a mediator between the holding portion and the vibrator, reducing the direct transmission of vibration and impact forces to the projecting portion. This intermediary element absorbs and dampens harmful vibrations, thereby reducing wear on the projecting portion and extending its service life while adding only moderate structural complexity.
3Power
If the holding portion vibrates with the vibrator, then the structure is simple, but drive output is lost
Solution Approach 1:
The elastic portion serves as a vibration isolation mediator that reduces the coupling between the vibrator's vibration and the holding portion's vibration. By decoupling these vibrations, the elastic portion prevents the holding portion from vibrating unnecessarily, thereby preserving drive output while maintaining a relatively simple structural configuration.
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 configuration significantly reduces unnecessary vibration, suppresses abnormal noise and wear, and improves energy conversion efficiency by ensuring the projecting portion reliably contacts the rotor, maintaining proper drive force and extending the lifespan of the components.
Implementation Method 1
an elastic portion placed between the holding portion and the weight portion
Implementation Method 2
a vibrator including a piezoelectric element
Data Source
AI summary
A piezoelectric drive device driving a driven member by a projecting portion provided on one end of a vibrator including a piezoelectric element, includes a fixing portion fixing the piezoelectric drive device, a holding portion holding the vibrator, an urging portion coupled to the fixing portion and urging the holding portion including the vibrator in a direction toward the projecting portion, a weight portion provided at an opposite side to the projecting portion in the holding portion, and an elastic portion placed between the holding portion and the weight portion.