Vibration Generator Startup Frequency Control
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Solution Overview
Problem
Conventional vibration generators that start at a resonance frequency face challenges in reducing startup time due to high counter-electromotive force and large free vibration, which prolongs the time required to reach a steady vibration.
Innovation Solution
A control method for a vibration generator that applies an alternating current at a starting frequency different from the resonance frequency, switching to the resonance frequency when the vibration reaches a predetermined ratio of the saturation vibration amount, thereby improving startup speed and reducing startup time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If startup is performed at resonance frequency, then vibration amplitude reaches saturation quickly, but counter-electromotive force is maximized and startup time is prolonged
Solution Approach 1:
The patent applies preliminary action by first driving the vibration generator at a frequency different from resonance to build initial momentum and reduce counter-electromotive force impact, then transitions to resonance frequency to achieve stable vibration. This two-stage approach prepares the system in advance for resonance operation, avoiding the direct startup problems.
Solution Approach 2:
The patent implements dynamics by continuously adjusting the driving frequency during startup. The frequency is dynamically changed from an initial non-resonance value to the target resonance frequency based on real-time vibration amplitude feedback, allowing the system to adapt to changing operational conditions and minimize startup time.
2Productivity
If free vibration at resonance frequency is large, then vibration amplitude reaches saturation quickly, but counter-electromotive force is maximized
Solution Approach 1:
The patent applies periodic action by using frequency sweeping or step-wise frequency changes during startup. Instead of applying constant resonance frequency from the start, the driving frequency is periodically adjusted to build vibration gradually while keeping counter-electromotive force within acceptable limits, then transitions to stable resonance operation.
Solution Approach 2:
The patent implements parameter changes by modifying the driving frequency parameter during the startup process. The frequency is changed from an initial value to the resonance frequency in a controlled manner, and the amplitude threshold for switching is also a adjustable parameter that optimizes the balance between productivity and energy loss.
3Loss of time
If driving frequency is changed to resonance frequency, then startup time is reduced, but frequency detection and switching control complexity increases
Solution Approach 1:
The patent applies feedback by monitoring the vibration amplitude in real-time and using this information to control the frequency switching decision. When the amplitude reaches a predetermined threshold during non-resonance driving, the system automatically switches to resonance frequency, creating a closed-loop control system that reduces complexity compared to open-loop frequency sweeping.
Solution Approach 2:
The patent implements self-service by enabling the vibration generator to automatically detect when it has built sufficient vibration amplitude and autonomously switch to resonance frequency without external intervention. The system uses its own vibration output as the detection signal, eliminating the need for separate sensing mechanisms and reducing overall system complexity.
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 significantly reduces the startup time by using a starting frequency that differs from the resonance frequency, allowing the vibration generator to reach a steady vibration state more quickly without requiring additional circuitry or increased costs.
Implementation Method 1
a vibration generator, which generates a vibration through a linear motor... a fixed part having spiral shaped current lines, and a movable part provided so as to be movable along the surface of the spiral shaped current lines. The current lines have a pair of spiral shaped flat coils, and the movable part has a magnetic pole face opposing the current lines
Implementation Method 2
both cases are premised on startup at a resonance frequency... detecting deviations in resonance frequency due to changes in the startup speed, stored resonance frequency, and environment
Data Source
AI summary
A control method for a vibration generator is provided. The vibration generator includes a fixed part around which a coil is wound, a movable part having a magnet, a bridge part movably supporting the movable part, and a power supply unit which applies an alternating current of a predetermined frequency to the coil. The power supply unit starts at the time of startup by the alternating current with a starting frequency which differs from a resonance frequency of the movable part, and the power supply unit changes the frequency of the applied alternating current to the resonance frequency of the movable part when the amount of vibration at the starting frequency reaches a predetermined ratio with respect to a saturation vibration amount of the resonance frequency.