Vibrator Driver Ellipse Ratio Control for Startability
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Solution Overview
Problem
Conventional vibration-type actuators face issues with startability and increased power consumption due to load variations and changes in actuator characteristics, leading to sharp speed rises and inefficient operation.
Innovation Solution
A driver for a vibrator that includes a control section and an alternating current signal generation section, which sets specific frequencies and phase differences to adjust the ellipse ratio of elliptical motion, allowing for a smoother start and efficient operation by changing the frequency and voltage ratio after initial start-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the frequency of the alternating current signal is reduced to improve startability, then the actuator can start more easily, but the consumption power increases and sharp speed rises occur
Solution Approach 1:
The patent changes the ellipse ratio parameter of the elliptical motion by adjusting the phase difference between alternating current signals applied to different electrode areas. By optimizing this parameter, the actuator achieves good startability without requiring excessive power consumption or causing sharp speed rises. The control section dynamically adjusts the phase difference to maintain an optimal ellipse ratio during startup and operation.
2Stability of the object's composition
If the ellipse ratio is optimized to prevent sharp speed rises, then smooth operation is achieved, but control complexity increases
Solution Approach 1:
The control section monitors the operation state of the actuator and dynamically adjusts the phase difference between alternating current signals to maintain an optimal ellipse ratio. This feedback mechanism ensures smooth operation and prevents sharp speed rises while adapting to changing load conditions and actuator characteristics, balancing stability with manageable control complexity.
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 approach improves startability and reduces power consumption by optimizing the ellipse ratio of the elliptical motion, preventing sharp speed rises and ensuring efficient movement of the driven body.
Implementation Method 1
a piezoelectric element (electro-mechanical transducer) 5 is joined to a back surface of the elastic member 4
Data Source
AI summary
One aspect of the present invention relates to a driver of a vibrator including: a control section; and an alternating current signal generation section configured to generate an alternating current signal based on an output from the control section, and to apply the alternating current signal to the vibrator, wherein the control section is configured to lower a frequency of the alternating current signal, and to change, after the frequency change, at least one of a voltage ratio and a phase difference of the alternating current signal such that the ellipse ratio of the elliptical motion changes from a first ellipse ratio to a second ellipse ratio, the second ellipse ratio has a larger ratio of a component in a moving direction in the elliptical motion to a component in a direction perpendicular to the moving direction in the elliptical motion than the first ellipse ratio.