Vibration Wave Motor Elastic Coupling for High Speed Large Mass Drive
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Solution Overview
Problem
Ultrasonic motors face challenges in maintaining high driving speed and ease of assembly when driving large masses, as increased spring load is required to suppress acceleration and deceleration, leading to decreased average driving speed, and the use of multiple vibrators increases the number of parts and complexity.
Innovation Solution
A vibration wave motor design incorporating piezoelectric elements, elastic coupling members, and a pressurizing unit that includes friction members and a moving unit to efficiently transfer vibrations, with the elastic coupling member configured to minimize mechanical response delay and allow for uniform pressurization, reducing the number of components and enhancing assembly ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the spring load of the plate spring is increased to drive a large mass, then the driving force is improved, but the ease of assembly deteriorates
Solution Approach 1:
The pressurizing unit is divided into multiple independent pressurizing members, each capable of applying force independently. This segmentation allows the total driving force to be distributed across multiple smaller units, maintaining ease of assembly while achieving the required total force for driving large masses.
Solution Approach 2:
Multiple pressurizing members are combined to work together in unison, collectively providing the necessary driving force. The elastic coupling member merges the output of multiple vibrators to drive the friction member, achieving high driving force while keeping individual components manageable for assembly.
2Reliability
If the spring load is increased to suppress acceleration and deceleration, then the control performance is improved, but the average driving speed decreases
Solution Approach 1:
The elastic coupling member provides dynamic compliance that adapts to acceleration and deceleration conditions. It allows controlled flexibility during speed changes while maintaining overall system rigidity, enabling good control performance without excessively limiting the average driving speed.
3Power
If a plurality of vibrators are used to generate larger driving force, then the power output is improved, but the device complexity increases
Solution Approach 1:
The elastic coupling member serves multiple functions simultaneously: it couples multiple vibrators together, provides pressurization to the friction member, allows relative movement between components, and maintains alignment. This multi-functionality reduces the need for separate components, lowering overall device complexity while using multiple vibrators for high power output.
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 vibration wave motor maintains high average driving speed and acceleration performance while reducing mechanical response delay and component count, effectively handling large masses without compromising control performance.
Implementation Method 1
a vibrator including a piezoelectric element and a protruding portion
Implementation Method 2
an elastic coupling member configured to couple the first holding member and the second holding member to each other
Implementation Method 3
a friction member, which is to be brought into friction contact with the vibrator; the vibrator and the friction member relatively move due to vibration of the vibrator
Data Source
AI summary
A vibration wave motor includes a vibrator; a first holding member configured to hold the vibrator; a second holding member; an elastic coupling member configured to couple the first holding member and the second holding member to each other; a friction member; and a pressurizing unit, wherein the vibrator and the friction member relatively move due to vibration of the vibrator, wherein the elastic coupling member includes a first coupling portion and a second coupling portion, and wherein one of the first coupling portion and the second coupling portion is arranged on a straight line that is parallel to a direction of the relative movement and passes through a pressurizing gravity center and another of the first coupling portion and the second coupling portion is arranged on a straight line that is orthogonal to the direction of the relative movement and passes through the pressurizing gravity center.