Active Dynamic Vibration Absorber Current Switching
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Solution Overview
Problem
Existing active dynamic vibration absorbers require complex control systems and increased manufacturing costs due to the need for sinusoidal control signals and protection against back electromotive force, which complicates the design and increases costs.
Innovation Solution
An active dynamic vibration absorber with a simple configuration that includes a coil part, a yoke part with a permanent magnet, and slide and contact protrusions that allow for the direction of current to be switched using drive devices, enabling efficient control of Lorentz force direction and magnitude without the need for an H-Bridge circuit or diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diode is installed to protect against back electromotive force, then the drive device is protected, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the diode protection circuit from the system by changing the fundamental control approach. Instead of using a diode to handle back electromotive force, the system uses bidirectional current control through contact protrusions that can switch current direction, eliminating the need for protective diodes and reducing circuit complexity.
Solution Approach 2:
Rather than protecting against back electromotive force passively with a diode, the invention actively controls current flow in both directions using the contact protrusion mechanism. This inverts the approach from passive protection to active bidirectional control, eliminating the diode and its associated complexity.
2Ease of operation
If an H-Bridge circuit is used to generate control signals in forward and reverse directions, then current direction control is achieved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the H-Bridge circuit by using a simpler contact protrusion-based switching mechanism. The contact protrusions directly switch current direction between the coil part and power supply without requiring an H-Bridge configuration, significantly reducing circuit complexity while maintaining bidirectional current control capability.
Solution Approach 2:
Instead of using a complex H-Bridge circuit to achieve bidirectional current control, the patent uses a simplified contact switching mechanism that copies the essential function of the H-Bridge (current direction control) through a much simpler structural implementation using contact protrusions and slide protrusions.
3Reliability
If sinusoidal control signals are used to control target frequency, then vibration attenuation is achieved, but the control system complexity increases
Solution Approach 1:
The patent replaces the complex sinusoidal control signal generation system with a mechanical switching system using contact protrusions. The mechanical switching of current direction through the contact protrusions directly generates the necessary control forces for vibration attenuation without requiring complex sinusoidal signal generation and processing circuits.
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 solution allows for effective vibration control with reduced manufacturing costs and simplified control systems by switching the current direction and adjusting the Lorentz force, thereby efficiently attenuating vibrations without damaging the drive device.
Implementation Method 1
the mass body reciprocates by Lorentz force generated by applying current to a coil
Implementation Method 2
a mass body including a yoke and a permanent magnet and a separate coil part are disposed, so that the mass body reciprocates by Lorentz force generated by applying current to a coil
Data Source
AI summary
An active dynamic vibration absorber includes: a coil part provided inside a housing and wound with a coil; a yoke part that moves with respect to the coil part when current flows in the coil part, and includes an upper yoke, a lower yoke, and a permanent magnet provided between the upper yoke and the lower yoke; springs mounted to the yoke part so as to switch a movement of the yoke part to a vibration; first and second slide protrusions electrically connected to both ends of the coil of the coil part, upper and lower contact protrusions formed in the yoke part to correspond to the first and second slide protrusions; and first and second drive devices that generate a relative movement between the coil part and the yoke part by selectively applying current to the upper and lower contact protrusions according to a control signal.