Vibration Wave Motor Control for Low-Speed Noise Suppression
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Solution Overview
Problem
Existing driving control systems for vibration wave motors face challenges in maintaining control performance and reducing noise during low-velocity driving, as reducing voltage amplitude increases susceptibility to friction and load, leading to reduced control performance and noise issues.
Innovation Solution
A driving control apparatus that adjusts the voltage amplitude of driving signals based on the phase difference and target velocity, using a processor and memory to control the phase difference and voltage amplitude, with a change rate that increases as the absolute value of the phase difference or target velocity decreases, thereby maintaining control performance and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the voltage amplitude of the driving signal is reduced during low-velocity driving, then noise is suppressed, but control performance deteriorates due to increased susceptibility to friction and load
Solution Approach 1:
The patent applies dynamics by making the voltage amplitude dynamically adjustable based on operating conditions. The control unit changes the voltage amplitude according to the phase difference between driving signals, allowing the system to adapt to varying friction and load conditions during low-velocity driving, thereby maintaining control performance while suppressing noise
Solution Approach 2:
The patent changes the voltage amplitude parameter dynamically during operation. By adjusting the voltage amplitude based on the phase difference between driving signals, the system optimizes the balance between noise suppression and control performance, ensuring reliable operation during low-velocity driving conditions
2Object-generated harmful factors
If the voltage amplitude is reduced to suppress unnecessary vibration, then noise decreases, but the system becomes more susceptible to friction and driving load
Solution Approach 1:
The system dynamically adjusts voltage amplitude based on the phase difference between driving signals, allowing it to respond to changing friction and load conditions. This dynamic adjustment reduces unnecessary vibration and noise while maintaining sufficient force to overcome friction and driving load
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 solution effectively suppresses noise and maintains control performance during low-velocity driving by dynamically adjusting the voltage amplitude, enhancing the stability and accuracy of the vibration wave motor's operation.
Implementation Method 1
a vibrator that is excited to vibrate by applying a first driving signal and a second driving signal that have a phase difference with each other
Data Source
AI summary
A driving control apparatus is configured to control a driving unit that moves relative to each other a vibrator that is excited to vibrate by applying a first driving signal and a second driving signal that have a phase difference with each other, and a contact member that contacts the vibrator. The driving control apparatus includes a first control unit configured to control the phase difference, and a second control unit configured to control a voltage amplitude of each of the first driving signal and the second driving signal. The second control unit controls the voltage amplitude so that a change rate of the voltage amplitude increases as an absolute value of the phase difference decreases.