Piezoelectric Base Displacement Feedback Control for Hysteresis
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Solution Overview
Problem
The accuracy of displacement of a base with a piezoelectric element is compromised due to the varying relationship between drive voltage and deformation at rising and falling times, leading to inconsistencies in desired displacement outcomes.
Innovation Solution
A control system comprising a piezoelectric element, a deformation sensor, and a drive device that adjusts the drive voltage to minimize the difference between the displacement signal and a setting signal, ensuring accurate displacement by feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a predetermined drive voltage is applied to a piezoelectric element at a falling time, then the base achieves desired displacement, but the base cannot achieve desired displacement when the same drive voltage is applied at a rising time
Solution Approach 1:
The patent implements a feedback control mechanism where the actual displacement of the base is measured and compared with the target displacement. The drive voltage is then adjusted based on the difference between actual and target values. This closed-loop feedback system compensates for the hysteresis effect, ensuring that the base achieves the desired displacement regardless of whether the voltage is applied at rising or falling time.
Solution Approach 2:
The patent dynamically adjusts the drive voltage parameter based on the operational state (rising or falling time) and the measured displacement. By changing the voltage parameter adaptively rather than applying a fixed voltage, the system overcomes the hysteresis characteristic and achieves consistent displacement accuracy across different voltage application conditions.
2Manufacturing precision
If feedback control is implemented to improve displacement accuracy, then displacement precision improves, but system complexity increases
Solution Approach 1:
The patent employs a feedback control mechanism that measures actual displacement and adjusts drive voltage accordingly. This closed-loop approach improves displacement accuracy by compensating for hysteresis effects, directly addressing the precision improvement while accepting the necessary increase in control system complexity.
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with an electronic feedback control system. Instead of using mechanical means to achieve precise displacement control, the system uses electronic sensing and voltage adjustment, which simplifies the overall system architecture while maintaining high precision.
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 system improves the accuracy of displacement by reducing the difference between the actual and desired displacements, enhancing the performance of piezoelectric devices like speakers by maintaining consistent displacement regardless of voltage application direction.
Implementation Method 1
By applying a drive voltage to a piezoelectric element, deformation occurs in the piezoelectric element due to an inverse piezoelectric effect
Implementation Method 2
a deformation sensor configured to detect a displacement of the base caused by deformation of the piezoelectric element
Data Source
AI summary
A control system includes: a piezoelectric element having a deformation amount that varies according to a magnitude of a drive voltage applied to the piezoelectric element; a base on which the piezoelectric element is arranged; a deformation sensor configured to detect a displacement of the base caused by deformation of the piezoelectric element and output the displacement as a displacement signal; and a drive device configured to apply the drive voltage to the piezoelectric element while adjusting the magnitude of the drive voltage so as to reduce a difference between a value of the displacement signal and a value of a setting signal.