Vibration Drive Device Gain Control for Stable Switching
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Solution Overview
Problem
Conventional vibration actuator control methods experience unstable controllability when switching between frequency control and pulse width control, and require limited power consumption switching ranges.
Innovation Solution
A vibration drive device with a controller that sets gains for frequency and pulse width control to prevent electric power or current from exceeding predetermined limits, ensuring stable operation during switching between control methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If speed control is switched between frequency control and pulse width control, then drive speed control flexibility is improved, but controllability becomes unstable
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gain values for frequency control and pulse width control based on the operating conditions. The controller switches between control modes while maintaining stability through gain parameter optimization, resolving the contradiction between control flexibility and stability.
Solution Approach 2:
The patent implements dynamic gain adjustment where the controller adapts the control parameters in real-time based on the current operating state. This dynamic adaptation allows stable switching between frequency and pulse width control modes, maintaining controllability while providing speed control flexibility.
2Adaptability or versatility
If electric power or current is increased to expand control range, then speed control range is improved, but electric power or current exceeds predetermined limits
Solution Approach 1:
The patent uses parameter changes by adjusting the gain values for frequency and pulse width control to expand the effective control range without increasing power consumption. The controller optimizes parameter utilization to achieve wider speed control within predetermined power limits.
Solution Approach 2:
The patent applies partial action by using only the necessary portion of available power to achieve the desired control range. The controller efficiently utilizes power resources through optimized gain settings, achieving adequate speed control without exceeding power limits.
3Speed
If gain values are increased to improve control response, then control responsiveness is improved, but electric power or current exceeds predetermined limits
Solution Approach 1:
The patent applies parameter changes by optimizing the gain values to achieve the desired control responsiveness while maintaining power consumption within limits. The controller adjusts frequency and pulse width control gains to balance response speed and power usage.
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
Prevents controllability instability during speed control switching between frequency and pulse width control within a limited power range, maintaining stable operation and efficient power management.
Implementation Method 1
a vibration element (driving element) having a piezoelectric element
Implementation Method 2
causing frictional driving of a contact body (driven body) brought into contact with the vibration element to thereby obtain a driving force
Data Source
AI summary
A vibration drive device that is capable of preventing instability when the speed control is switched between frequency control and pulse width control includes a controller that controls driving of a vibration actuator by applying an alternating voltage to an electromechanical energy conversion element. A switching pulse is generated by switching a DC voltage. A maximum duty ratio of the switching pulse is determined based on a driving condition of the vibration actuator. The driving of the vibration actuator is controlled by switching between frequency control and pulse width control. A gain for frequency control and a gain for pulse width control are set according to the maximum duty ratio so as to prevent electric power or electric current from exceeding an electric power limit or an electric current limit set in advance.