Inductor assemblies
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Solution Overview
Problem
Conventional inductor coil designs are unable to withstand significant transient overvoltages and are large in size due to the need for significant conductor cross-section, leading to space inefficiencies and potential vibration issues from minimal contact between coil turns.
Innovation Solution
A dual coil inductor assembly with a thin, wide conductor foil wrapped around a plastic cylinder, using a thin insulating sheet for insulation between turns, and epoxy resin potting to enhance insulation and stability, along with a compact enclosure and bushings to manage vibration and environmental protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional inductor coil designs use significant conductor cross-section, then they can handle high current, but the size becomes large and space efficiency is reduced
Solution Approach 1:
The patent transitions from conventional round wire conductors to flat conductor foils, changing the dimensional configuration of the conductor. This allows the conductor to be wound in a compact layered pattern that achieves the same current handling capability with significantly reduced volume. The flat foil geometry enables more efficient packing and stacking, reducing the overall inductor size while maintaining power handling.
Solution Approach 2:
The patent employs composite construction by combining thin conductor foils with insulating sheets and epoxy resin potting. This composite approach allows the use of thinner conductors that can be densely packed, achieving high current capacity in a compact volume. The epoxy resin encapsulation provides mechanical support and thermal management, enabling the compact design to handle high power without overheating.
2Device complexity
If conventional inductor coil designs use minimal contact between coil turns, then the structure is simpler, but vibration issues occur and stability is reduced
Solution Approach 1:
The patent merges the conductor foils, insulating sheets, and epoxy resin into a single integrated structure. The epoxy resin potting encapsulates the entire wound assembly, bonding all components together into a rigid, vibration-resistant unit. This eliminates the minimal contact problem by creating continuous mechanical bonding throughout the inductor, significantly improving stability without adding complex separate components.
Solution Approach 2:
The use of epoxy resin as a bonding matrix creates a composite structure that mechanically couples the conductor foils and insulating sheets. This composite construction provides rigid mechanical support, prevents relative movement between turns, and eliminates vibration issues while maintaining structural integrity. The epoxy acts as both an insulator and a structural adhesive, simplifying the overall design.
3Ease of manufacture
If conventional inductor coil designs use standard insulation, then manufacturing is easier, but they cannot withstand significant transient overvoltages
Solution Approach 1:
The patent uses a composite insulation system combining thin insulating sheets placed between conductor layers with epoxy resin potting that encapsulates the entire assembly. This dual-layer composite insulation provides superior dielectric strength and transient overvoltage withstand capability compared to conventional single-layer insulation. The epoxy resin fills all voids and provides continuous insulation, preventing breakdown under high voltage stress while maintaining manufacturing simplicity through a single pouring operation.
Solution Approach 2:
The patent changes the insulation approach from thick discrete insulation layers to thin insulating sheets combined with epoxy resin potting. This parameter change in insulation thickness and configuration, combined with the epoxy's high dielectric strength, achieves superior transient overvoltage withstand capability. The epoxy resin can withstand extremely high electric fields, providing reliability under transient conditions while allowing thinner overall insulation packages.
4Volume of moving object
If thin conductor foil is used to minimize size, then volume is reduced, but insulation integrity becomes more critical and harder to maintain
Solution Approach 1:
The patent employs a composite insulation system where thin insulating sheets are placed between conductor foil layers and the entire assembly is encapsulated in epoxy resin. This composite structure provides robust insulation integrity even with thin conductors, as the epoxy resin fills all gaps and provides continuous dielectric protection. The combination of sheet and potting insulation creates redundant insulation paths, ensuring integrity is maintained despite the reduced conductor thickness.
Solution Approach 2:
The epoxy resin acts as an intermediary material that provides the primary insulation barrier between adjacent conductor foils. This intermediary layer of epoxy, combined with the thin insulating sheets, ensures electrical isolation is maintained even when conductor foils are thin. The epoxy's high dielectric strength compensates for the reduced conductor thickness, maintaining insulation integrity throughout the compact structure.
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 design effectively withstands high transient overvoltages, minimizes size, and reduces vibration, while maintaining high insulation integrity and stability, even under extreme conditions.
Implementation Method 1
Inductors coils are used in the AC power networks for power factor correction, voltage regulation, reduction of di/dt, and protection of downstream equipment
Implementation Method 2
using a thin insulating sheet for insulation between turns, and epoxy resin potting to enhance insulation and stability
Data Source
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AI summary
An inductor assembly includes a coil including a spirally wound metal foil.