Inverse Magnetostrictive Power Generation Element U-Shaped Frame
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Solution Overview
Problem
Existing power generation elements with cantilever beam structures suffer from fixed-end loss due to insufficient support, bending moments, and friction, leading to short-lived vibrations, and adhesive issues causing kinetic energy dissipation.
Innovation Solution
A power generation element with a U-shaped frame design that cancels out bending moments and shearing forces, using a single magnet placement to minimize friction and adhesive joining methods like soldering or brazing to prevent kinetic energy dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cantilever beam structure with straight frame is used, then the structure is simple, but fixed-end loss occurs due to insufficient support causing bending moments and shearing forces that dissipate kinetic energy
Solution Approach 1:
The patent inverts the conventional straight cantilever beam structure into a U-shaped frame structure. This inversion allows the fixed end to be supported at both sides, canceling out bending moments and shearing forces that cause energy loss in straight structures. The U-shape enables the fixed end to function as a support point rather than just an endpoint, fundamentally changing how forces are distributed.
Solution Approach 2:
The patent introduces asymmetry by placing the magnet on only one inner side face of the U-shaped frame rather than symmetrically on both sides. This asymmetric placement minimizes friction between the magnet and frame during vibration, reducing energy dissipation while maintaining the structural benefits of the U-shape.
2Ease of manufacture
If adhesive is used to join magnetostrictive rod to frame, then assembly is simple, but adhesive causes kinetic energy dissipation during vibration
Solution Approach 1:
The patent extracts the adhesive from the joining process entirely, replacing it with mechanical joining methods such as soldering or brazing. This removal of adhesive eliminates the source of kinetic energy dissipation that occurs during vibration, while the mechanical joining methods provide sufficient structural integrity without the harmful side effects of adhesive materials.
3Power
If multiple magnets are placed on both inner side faces of the frame, then magnetic flux is maximized, but friction increases causing energy loss
Solution Approach 1:
The patent applies asymmetry by placing the magnet on only one inner side face of the U-shaped frame rather than symmetrically on both sides. This asymmetric configuration reduces the total friction between magnets and frame during vibration, minimizing kinetic energy loss while maintaining effective power generation through the magnetostrictive effect.
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 U-shaped frame design extends vibration duration by minimizing fixed-end loss and kinetic energy dissipation, while the single magnet placement and secure joining methods enhance power generation efficiency and longevity.
Implementation Method 1
The magnetostrictive effect refers to an effect whereby a ferromagnetic body deforms when a magnetic field is applied to it
Implementation Method 2
voltage (electromotive force) is generated in a coil based on the law of electromagnetic induction that voltage generates in proportion to temporal change in magnetic flux
Implementation Method 3
a magnetostrictive material also demonstrates the inverse magnetostrictive effect, whereby it deforms due to a compressive/tensile stress generating inside as a result of application of an external force, thereby causing its magnetization (magnetic flux) to change significantly
Data Source
AI summary
A power generation element of inverse magnetostrictive type has: a first power generation part including a first magnetostrictive rod made of magnetostrictive material, a first coil wound around the first magnetostrictive rod, and a first magnetic rod having appropriate rigidity and a shape to apply a uniform compressive force or tensile force to the first magnetostrictive rod and being placed in parallel with the first magnetostrictive rod; a frame made of magnetic material bent in a substantially U shape, whose one end and other end across the bent location constitute a fixed end and free end, respectively; and a magnet. The power generation element can suppress the loss of kinetic energy while vibrating so that vibration will last long. The power generation element can be used in an actuator.