Piezoelectric Element Voltage Reduction for Oscillatory Wave Motors
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Solution Overview
Problem
Oscillatory wave motors require a step-down circuit to reduce the output voltage from detection phase electrodes to a level compatible with phase comparators, increasing complexity and cost, particularly in size reduction efforts.
Innovation Solution
A piezoelectric element with specific configurations of drive, detection, and non-drive phase electrodes, where the piezoelectric constants in different regions are optimized to reduce the output voltage without the need for a step-down circuit, allowing direct input to phase comparators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a step-down circuit is added to reduce output voltage from detection phase electrodes, then voltage compatibility with phase comparators is achieved, but device complexity and cost increase
Solution Approach 1:
The invention extracts the voltage reduction function from a separate step-down circuit and integrates it directly into the piezoelectric element structure itself. By designing specific electrode configurations (drive phase electrodes, detection phase electrodes, and non-drive phase electrodes) with optimized piezoelectric constants in different regions, the element inherently outputs reduced voltage signals that are directly compatible with phase comparators, eliminating the need for external voltage reduction circuits.
Solution Approach 2:
The invention introduces non-drive phase electrodes as intermediary elements between the drive phase electrodes and detection phase electrodes. These non-drive phase electrodes with specific piezoelectric constants act as mediators that help reduce the output voltage from the detection phase electrodes to a level compatible with phase comparators, while maintaining the overall functionality of the motor system.
2Reliability
If a step-down circuit is added to reduce output voltage, then voltage compatibility is achieved, but manufacturing cost increases
Solution Approach 1:
The invention merges the voltage reduction function with the piezoelectric element structure by integrating specific electrode configurations directly into the element. The non-drive phase electrodes and optimized piezoelectric constant distribution in different regions work together to inherently reduce output voltage, combining multiple functions into a single component and eliminating the need for separate step-down circuitry, thereby reducing manufacturing cost.
Solution Approach 2:
The piezoelectric element performs self-service by inherently reducing its own output voltage through its internal electrode configuration and piezoelectric constant distribution. The element automatically generates voltage signals at the appropriate level for phase comparators without requiring external voltage reduction circuits, making the system more cost-effective and easier to manufacture.
3Volume of moving object
If component count is reduced for size reduction, then compactness is achieved, but voltage compatibility may be compromised
Solution Approach 1:
The invention applies local quality by optimizing the piezoelectric constants in different regions of the piezoelectric element. The drive phase electrodes, detection phase electrodes, and non-drive phase electrodes each have specific piezoelectric constant values tailored to their functions. This localized optimization ensures that the detection phase electrodes output reduced voltage signals compatible with phase comparators, achieving voltage compatibility without requiring additional components for size reduction.
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
This configuration enables efficient voltage reduction, simplifying the motor control system, reducing costs, and enhancing size reduction capabilities while maintaining effective motor operation.
Implementation Method 1
a piezoelectric material which is sandwiched between the common electrode and the drive phase electrodes, the detection phase electrode, and the non-drive phase electrode
Implementation Method 2
A strain generated in the piezoelectric material in the detection phase electrode portion is converted into an electrical signal corresponding to the piezoelectric constant of the piezoelectric material
Data Source
AI summary
The present invention provides a piezoelectric element that includes a piezoelectric material having first and second surfaces; a common electrode disposed on the first surface; and a plurality of drive phase electrodes, a detection phase electrode, and a non-drive phase electrode disposed on the second surface, the piezoelectric material being sandwiched between the common electrode and the electrodes on the second surface. An absolute value d(1) of a piezoelectric constant of the piezoelectric material (1) in portions sandwiched between the drive phase electrodes and the common electrode, an absolute value d(2) of a piezoelectric constant of the piezoelectric material (2) in a portion sandwiched between the detection phase electrode and the common electrode, and an absolute value d(3) of the piezoelectric material (3) in a portion sandwiched between the non-drive phase electrode and the common electrode satisfy d(2)<0.95d(1), d(3)<0.95d(1), and 0.9≦d(3)/d(2)≦1.1.