Vibration Wave Motor Friction Member Damping Design
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Solution Overview
Problem
Ultrasonic motors face issues with resonance frequency intervals becoming smaller when the friction member is reduced in thickness, leading to unnecessary vibration and noise, which degrades the motor's characteristics and generates noise.
Innovation Solution
Incorporating a damping member to dampen vibrations in the friction member, with the damping member being positioned differently from the friction member's sliding and fixing regions, preventing interference and allowing for a thinner friction member design without degrading drive characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the friction member is reduced in thickness to reduce size and cost, then the size and cost are reduced, but resonance is liable to occur around the drive frequency band causing unnecessary vibration and noise
Solution Approach 1:
A damping member is introduced as an intermediary element between the vibration body and the friction member. This damping member specifically targets and suppresses the resonance vibrations in the friction member without interfering with the drive frequency, thereby eliminating unnecessary vibration and noise while allowing the friction member to maintain reduced thickness
Solution Approach 2:
The damping member is designed with specific positional parameters - it contacts the friction member at a location different from where the vibration body contacts it. This positional parameter differentiation allows the damping member to suppress resonance frequencies without affecting the drive frequency band, thus resolving the contradiction between thin friction member design and vibration suppression
2Volume of moving object
If the friction member is reduced in thickness, then size is reduced, but intervals of resonance frequencies become smaller making the motor more susceptible to resonance
Solution Approach 1:
The damping member acts as a mediator that specifically targets resonance frequencies in the friction member. By positioning it differently from the drive contact point, it suppresses harmful resonance without affecting the reliability of the drive frequency, enabling thin friction member design while maintaining reliability
3Object-generated harmful factors
If a damping member is added to suppress vibration, then noise is reduced, but device complexity increases
Solution Approach 1:
The damping member is merged with the friction member structure, sharing the same component space and integration points. This merging approach allows vibration suppression functionality to be added without proportionally increasing overall device complexity, as the damping member utilizes the existing structural framework of the friction member
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 damping member effectively reduces unnecessary vibration and noise, allowing for a reduction in size and cost while maintaining motor performance by positioning damping regions to prevent interference with sliding regions and enhancing the damping effect.
Implementation Method 1
a vibration body including a piezoelectric element; High-frequency vibration is generated in the vibrator
Implementation Method 2
a damping member configured to damp vibration generated in the friction member; reducing unnecessary vibration of the friction member, thereby suppressing noise
Data Source
AI summary
Provided is a vibration wave motor, including: a vibration body; a friction member; a press member configured to pressurize the vibration body against the friction member; a base member configured to fix the friction member; and a damping member configured to damp vibration, wherein the vibration body and the friction member are configured to move relative to each other, wherein the friction member includes: a first surface having a first region held in abutment against the vibration body; and a second surface, which is a back surface of the first surface, and has a second region held in abutment against the base member, wherein at least one of the first surface and the second surface has a third region held in contact with the damping member, and wherein positions of the first region and the third region in a pressurizing direction of the press member are different from each other.