Vibration Actuator Drive Control for Low-Speed Noise Suppression
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Solution Overview
Problem
Existing vibration actuator control methods face challenges in suppressing noise and unnecessary vibration while reducing power consumption, particularly at low velocities, as the amplitude of vertical motion increases with decreasing phase difference, leading to increased power consumption.
Innovation Solution
A driving control apparatus that adjusts the voltage amplitude of the power supplied to the vibration actuator by determining the duty ratio based on the absolute value of the phase difference, shifting from phase difference control to frequency control as the velocity increases, thereby reducing unnecessary vibration and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If phase difference control is used to drive the vibration actuator at low velocity, then the actuator can be controlled at low speeds, but the amplitude in the vertical direction increases causing unnecessary vibration and noise
Solution Approach 1:
The patent changes the voltage amplitude parameter dynamically based on the phase difference value. When the absolute phase difference is small (below threshold), the voltage amplitude is reduced to suppress vertical vibration. This parameter adjustment resolves the contradiction by allowing low velocity operation while minimizing harmful vibrations through adaptive voltage control.
2Object-generated harmful factors
If frequency control is used to suppress vibration in the vertical direction, then unnecessary vibration can be reduced, but power consumption increases
Solution Approach 1:
The patent introduces voltage amplitude as a controllable parameter that varies with phase difference. By reducing voltage amplitude when operating at low velocities with small phase differences, the system suppresses vertical vibration without requiring frequency control, thus avoiding the associated power consumption increase.
3Use of energy by moving object
If voltage amplitude is reduced when phase difference is small, then power consumption decreases and vertical vibration is suppressed, but this requires dynamic adjustment of voltage based on phase difference
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors the phase difference between the two-phase frequency signals and dynamically adjusts the voltage amplitude accordingly. When the absolute phase difference falls below a predetermined threshold, the voltage amplitude is reduced. This feedback-based control achieves power savings while maintaining simple control logic.
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
Effectively suppresses noise and unnecessary vibration while reducing power consumption by dynamically adjusting the voltage amplitude in response to phase difference changes, ensuring efficient operation at low velocities.
Implementation Method 1
a vibrator 205 that is made to generate vibration by applying a two-phase frequency signal having a phase difference
Data Source
AI summary
A driving control apparatus controls an actuator that relatively moves a vibrator and a contact body contacting the vibrator, the vibrator being made to generate vibration by applying a first signal and a second signal having a phase difference. The driving control apparatus includes at least one processor or circuit configured to execute a plurality of tasks including a first determining task configured to determine the phase difference, and a second determining task configured to determine a voltage amplitude of power supplied to the actuator so that the voltage amplitude decreases as an absolute value of the phase difference decreases.