Buried Electric Coil in Magnetorheological Piston Core
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Solution Overview
Problem
Conventional magnetorheological (MR) devices with unburied electric coils in MR piston assemblies are limited in terms of magnetic force generation and efficiency, requiring higher excitation or more coil Ampere turns to achieve comparable results.
Innovation Solution
The use of partially or fully buried electric coils within the ferromagnetic MR piston core, where at least a portion of the coil is covered by the outer circumferential surface, enhances magnetic force generation and efficiency by altering the magnetic flux distribution and reducing magnetically inactive regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional unburied electric coils are used in MR piston assemblies, then the device structure is simpler and easier to manufacture, but the magnetic force generation is limited and requires higher excitation or more coil Ampere turns
Solution Approach 1:
The electric coil is nested within a circumferential surface slot of the ferromagnetic MR piston core, with at least a portion of the coil buried under the outer circumferential surface. This nesting arrangement allows the coil to be positioned within the ferromagnetic material, enhancing magnetic flux distribution and improving magnetic force generation efficiency while reducing the excitation requirements.
Solution Approach 2:
The invention creates a localized difference in magnetic properties by burying the coil within the ferromagnetic piston core material. The region around the buried coil exhibits enhanced magnetic flux concentration and altered distribution patterns compared to conventional unburied configurations, thereby improving magnetic force generation in the critical interaction zone between the coil and MR fluid.
2Force
If conventional unburied electric coils are used in MR piston assemblies, then the manufacturing process is simpler, but the magnetic flux distribution is less efficient and magnetically inactive regions are increased
Solution Approach 1:
The electric coil is nested within a circumferential surface slot of the ferromagnetic MR piston core, with at least a portion of the coil buried under the outer circumferential surface. This nesting arrangement allows the coil to be positioned within the ferromagnetic material, enhancing magnetic flux distribution and improving magnetic force generation efficiency while reducing the excitation requirements.
Solution Approach 2:
The invention transitions from a surface-mounted coil configuration to a partially or fully embedded coil configuration within the piston core. This dimensional change in coil placement enables the magnetic flux to penetrate through the ferromagnetic material, creating more efficient flux distribution patterns and reducing magnetically inactive regions in the MR fluid passage.
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 configuration results in higher MR force generation for a given coil excitation and allows for the same MR force with lower applied coil Ampere turns, while also extending magnetically active regions and reducing inactive regions, thereby enhancing the dynamic range and performance of MR devices.
Implementation Method 1
an electric coil, wherein at least a portion of the electric coil is buried in the ferromagnetic MR piston core under the outer circumferential surface
Implementation Method 2
A magnetorheological (MR) fluid-based device having an MR piston assembly
Data Source
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AI summary
A magnetorheological (MR) fluid-based device including an MR piston assembly. The MR piston assembly includes a ferromagnetic MR piston core and an electric coil. The MR piston core has a central longitudinal axis and has an outer circumferential surface substantially coaxially aligned with the central longitudinal axis. The electric coil is positioned in the MR piston core and is substantially coaxially aligned with the central longitudinal axis. A portion, or at least a portion, of the electric coil is buried in the MR piston core under the outer circumferential surface.