Vibration Actuator Driving Control with Phase-Dependent Waveform Shaping
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Solution Overview
Problem
Existing vibration actuators face challenges in controlling driving signals to achieve low power consumption while maintaining high torque, particularly during starting and stopping operations.
Innovation Solution
A driving control apparatus that generates and applies driving signals with the same waveform but different phases to multiple electromechanical energy conversion elements, adjusting the waveform based on the phase to optimize energy efficiency and torque output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional driving signals are applied to vibration actuators, then the actuators can operate, but power consumption increases and torque output decreases
Solution Approach 1:
The patent applies dynamics by making the waveform shape variable according to the phase angle. The driving signal waveform is dynamically adjusted based on the phase, transitioning between different shapes (e.g., from triangular to trapezoidal to square-like) as the phase changes. This dynamic adaptation allows the system to optimize both power consumption and torque output at different operating phases, resolving the contradiction between energy efficiency and power output.
Solution Approach 2:
The patent implements parameter changes by modifying the waveform shape parameter based on phase angle. Specifically, the waveform shape is changed from triangular at certain phases to trapezoidal or square-like at other phases. This parameter variation optimizes the electrical-mechanical energy conversion efficiency at different points in the vibration cycle, enabling low power consumption while maintaining high torque output.
2Device complexity
If driving signals with fixed waveform are applied, then control is simple, but energy efficiency and torque optimization are limited
Solution Approach 1:
The control system dynamically adjusts the waveform shape based on the phase angle of the driving signal. The controller monitors the phase and automatically selects or generates the appropriate waveform shape (triangular, trapezoidal, square-like) to optimize energy efficiency. This dynamic control approach achieves high energy efficiency without requiring complex manual intervention or overly complicated control algorithms.
Solution Approach 2:
The system changes the waveform shape parameter according to the phase angle, implementing a straightforward parameter variation strategy. The controller modifies the signal waveform from triangular to trapezoidal or square-like shapes based on phase conditions. This parameter change approach improves energy efficiency while maintaining relatively simple control logic and device structure.
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
Enables efficient driving of vibration actuators with low power consumption and high torque by effectively managing the phase and waveform of driving signals, improving both power efficiency and operational characteristics.
Implementation Method 1
a vibration actuator 2 having a plurality of electromechanical energy conversion elements
Data Source
AI summary
A driving control apparatus that controls driving of a vibration actuator having a plurality of electromechanical energy conversion elements. The driving control apparatus includes a controller configured to generate a plurality of driving signals each of which has a same waveform and has a different phase, and to respectively apply the plurality of driving signals to different elements of the plurality of electromechanical energy conversion elements. The controller changes the waveform according to the phase. A shape of a first waveform according to a first phase is closer to a square wave shape than a shape of a second waveform according to a second phase that is larger than the first phase.