Electromagnetic Swing Blade Resonance Tracking With Detection Coil
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Solution Overview
Problem
Conventional electromagnetic drive blades face challenges in maintaining resonance frequency due to manufacturing precision deviations and environmental factors like dust deposit, leading to reduced airflow efficiency and increased power consumption.
Innovation Solution
An electromagnetic drive blade apparatus with a detection coil and automatic gain control unit that adjusts the drive frequency to match the current resonance frequency of the blade, using multiple frequencies to drive the blade and detect induced voltages for optimal resonance state maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed drive frequency is used for the electromagnetic coil, then the device structure is simple and manufacturing is easy, but the blade cannot maintain resonance operation when natural frequency changes due to manufacturing deviations or environmental factors
Solution Approach 1:
The patent employs feedback control by detecting the blade's natural frequency through induced voltage measurements and adjusting the drive frequency accordingly. The detection coil monitors the blade's vibration state, and the control system modifies the drive frequency to maintain resonance, ensuring reliable operation despite manufacturing variations or environmental changes.
Solution Approach 2:
The patent transitions from a static fixed-frequency drive system to a dynamic frequency adjustment system. The drive frequency is no longer fixed but is continuously adapted based on the blade's actual natural frequency, which may change due to manufacturing tolerances, dust accumulation, or mechanical wear over time.
2Productivity
If the drive frequency is adjusted to match the blade's natural frequency, then maximum swing amplitude and airflow output are achieved, but the system requires complex frequency detection and adjustment mechanisms
Solution Approach 1:
The blade itself serves as the frequency detector through electromagnetic induction. As the blade vibrates, it generates an induced voltage in the detection coil that resonates at the blade's natural frequency. This self-service approach eliminates the need for external frequency sensors or complex detection systems, as the blade's own vibration characteristics provide the frequency information needed for optimization.
Solution Approach 2:
The detection coil serves multiple functions: it detects the blade's natural frequency through induced voltage, monitors the vibration amplitude, and provides feedback for frequency adjustment. This multi-functional component simplifies the overall system by combining detection and control functions in a single element.
3Manufacturing precision
If manufacturing precision is improved to ensure consistent natural frequency, then resonance operation is easier to achieve, but production costs increase and batch production becomes less feasible
Solution Approach 1:
Instead of relying on tight manufacturing tolerances to ensure consistent natural frequency across batches, the patent changes the operational parameter (drive frequency) to adapt to each blade's actual natural frequency. This approach allows batch production with standard tolerances while maintaining resonance operation through dynamic parameter adjustment, making manufacturing more feasible and cost-effective.
4Reliability
If the blade operates away from resonance frequency, then manufacturing tolerances are more acceptable, but power consumption increases and airflow efficiency decreases
Solution Approach 1:
The system uses feedback from the detection coil to monitor the blade's vibration characteristics and adjusts the drive frequency to maintain resonance operation. This feedback mechanism ensures that the blade operates at maximum efficiency with minimum power consumption, even when natural frequency shifts occur due to manufacturing variations or environmental factors.
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
Ensures the blade operates consistently at resonance frequency, maximizing airflow and minimizing power consumption even with manufacturing precision deviations and mechanical performance changes.
Implementation Method 1
an alternating voltage signal is applied to the electromagnetic coil, and the blade swings under an action of an electromagnetic force
Implementation Method 2
a detection coil, and the detection coil is configured to detect the induced voltage generated by the blade
Implementation Method 3
When a frequency of an alternating voltage is equal to a natural frequency of a blade, the blade reaches a maximum swing amplitude
Data Source
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Figure 5
AI summary
Embodiments of this application provide an electromagnetic drive blade apparatus, including a blade and a drive coil, where the drive coil is configured to receive a drive signal, and drive, by using the drive signal, the blade to swing; when a frequency of the drive signal is different from a resonance frequency of the blade, the drive coil receives a new drive signal, and drives, by using the new drive signal, the blade to swing; and a frequency of the new drive signal is the resonance frequency. Therefore, according to the method in the embodiments of this application, a new drive signal is received, and a drive frequency of a drive coil is adjusted to a resonance frequency of a blade, so that the blade swings at the resonance frequency, and the blade can be constantly in a resonance state.