Vibration Actuator Controller Dynamic Frequency Filter
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Solution Overview
Problem
Existing vibration actuator controllers face challenges in maintaining high position detection accuracy, especially during stopping, due to noise interference and varying vibration characteristics, leading to instability and reduced responsiveness.
Innovation Solution
A controller that adjusts frequency bands for position signals based on the actuator's operational state, using a filter to attenuate noise during driving and stopping, with a narrower frequency band during stopping to enhance accuracy and a wider band during driving to adapt to changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter circuit with high noise elimination performance is used, then electromagnetic noise and mechanical vibration are suppressed, but delay in the temporal phase of the signal is increased, degrading stability and quick responsiveness in position control characteristics
Solution Approach 1:
The patent applies dynamics by making the cut-off frequency of the filter variable rather than fixed. The control unit dynamically adjusts the cut-off frequency based on the actuator's operational state: using a first (higher) cut-off frequency during driving to maintain responsiveness, and a second (lower) cut-off frequency during stopping to enhance noise suppression and stability. This dynamic adaptation resolves the contradiction between noise elimination and control responsiveness.
Solution Approach 2:
The patent changes the parameter of the filter's cut-off frequency according to the actuator's state. By switching between different cut-off frequency values (first frequency during driving, second frequency during stopping), the system optimizes the balance between noise filtering performance and signal responsiveness, thereby resolving the technical contradiction.
2Object-affected harmful factors
If the cut-off frequency is set in proportion to the driving speed, then noise elimination is improved during high-speed operation, but phase delay increases during low-speed control, lowering stability and quick responsiveness
Solution Approach 1:
The patent implements dynamic adjustment of the cut-off frequency based on the actuator's operational state rather than strictly proportional to driving speed. During low-speed control and stopping, the system switches to a lower cut-off frequency to minimize phase delay and maintain stability, while during high-speed driving, it uses a higher cut-off frequency for effective noise elimination. This state-based dynamic adjustment resolves the contradiction between noise elimination and low-speed responsiveness.
3Measurement precision
If a narrower frequency band is used during stopping, then position detection accuracy is increased, but responsiveness during driving is reduced
Solution Approach 1:
The patent applies dynamics by switching the filter's frequency band characteristics according to the actuator's operational state. During driving, a wider frequency band (first cut-off frequency) is used to maintain quick responsiveness and avoid signal delay. During stopping, a narrower frequency band (second cut-off frequency) is applied to enhance position detection accuracy by suppressing noise. This dynamic frequency band adjustment resolves the contradiction between measurement precision and responsiveness.
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 reduces noise interference, increases position detection accuracy during stopping, and maintains quick responsiveness during driving, enabling stable and precise position control.
Implementation Method 1
a filter configured to have the first position signal input thereto, and output a second position signal generated by attenuating signal components having frequencies except a specific frequency band
Implementation Method 2
excites a vibration in the vibration element by applying an AC signal to thereby move the vibration element and the driven element relative to each other
Data Source
AI summary
A controller is capable of improving position detection accuracy during the stopping of an actuator, and controlling the actuator with high stability and quick responsiveness during driving. A first position signal corresponding to an amount of relative movement between the actuator and a driven element is output to a filter, and the filter outputs a second position signal generated by attenuating signal components having frequencies except a specific frequency band. Driving and stopping of the actuator are controlled according to the second position signal. As the specific frequency band, a first frequency band is set in the filter during the driving of the actuator, and a second frequency band is set in the filter during the stopping of the actuator. The first frequency band and the second frequency band both include 0 Hz, and the second frequency band is narrower than the first frequency band.