Annular Vibration Plate Grooves for Wave Suppression
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Solution Overview
Problem
Annular vibration wave motors experience unnecessary traveling waves and standing waves due to inaccuracies in contact surfaces, mechanical vibrations, and non-uniform contact pressures, leading to abnormal noise and power reduction.
Innovation Solution
The vibration wave motor incorporates an annular vibration plate with radially extending groove portions of varying depths, pressed by a vibration damping member in a non-uniform manner, to prevent or reduce unnecessary traveling waves and standing waves by locally restraining antinode portions of these waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vibration wave motor is driven with uniform contact pressure, then the simplicity of the pressure application is maintained, but unnecessary traveling waves and standing waves occur due to contact surface inaccuracies and mechanical vibrations
Solution Approach 1:
The pressure application is made non-uniform by strategically positioning the vibration damping member to apply greater pressure at antinode portions of unnecessary standing waves. This local differentiation in pressure distribution suppresses the formation of unnecessary traveling waves and standing waves while maintaining the overall simplicity of the pressure application mechanism.
2Reliability
If groove portions of varying depths are introduced to suppress unnecessary waves, then the vibration stability is improved, but the manufacturing complexity increases
Solution Approach 1:
Groove portions are introduced at specific locations on the vibration plate with varying depths corresponding to the antinode positions of unnecessary standing waves. This localized modification approach suppresses unnecessary waves while minimizing the overall manufacturing complexity compared to redesigning the entire vibration plate structure.
3Productivity
If the vibration damping member presses the vibration plate uniformly, then the structural simplicity is maintained, but the driving speed becomes insufficient due to energy loss from unnecessary waves
Solution Approach 1:
The vibration damping member acts as an intermediary element between the pressure source and the vibration plate. It is configured to transmit pressure non-uniformly to the vibration plate, with greater pressure at antnode portions, thereby suppressing unnecessary waves and improving driving speed without requiring direct complex pressure distribution mechanisms.
4Object-affected harmful factors
If non-uniform pressure application is implemented to suppress unnecessary waves, then abnormal noise is reduced, but the ease of operation increases due to additional control requirements
Solution Approach 1:
The vibration damping member is pre-configured with a specific shape and positioning that corresponds to the antnode portions of unnecessary standing waves. This preliminary configuration ensures that non-uniform pressure is automatically applied in the correct locations without requiring real-time control adjustments, thereby reducing abnormal noise while maintaining ease of operation.
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 ensures sufficient driving speed while effectively preventing or reducing unnecessary waves, thereby minimizing abnormal noise and power reduction.
Implementation Method 1
an annular piezoelectric element, which is provided on one surface of the vibration plate
Implementation Method 2
a vibration damping member, which are arranged in sequence... the annular vibration plate is pressed by the vibration damping member in a non-uniform manner, to prevent or reduce unnecessary traveling waves and standing waves
Implementation Method 3
uses friction caused by a drive force of a vibration excited by the vibrator to relatively move the driven body
Data Source
AI summary
A vibration wave motor includes a driven body, a vibrator including an annular vibration plate and an annular piezoelectric element, and a vibration damping member, which are arranged in sequence, wherein the vibration plate has, on a side facing the driven body, radially extending groove portions at X places, and, when center depths of the groove portions at X places are sequentially denoted by D1 to DX in a circumferential direction, D1 to DX vary along a curve obtained by superposing one or more sine waves, and wherein the vibration plate is locally supported by the vibration damping member in some or all antinode portions of a standing wave occurring when the vibration wave motor is driven.