Hall Current Sensor Spacer Structure for High-Temperature Epoxy Curing
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Solution Overview
Problem
Current sensors, such as Hall current sensors, face challenges with protective materials like epoxy not fully curing due to contaminants and high curing temperatures damaging electrical components, leading to insufficient protection of Hall sensing elements.
Innovation Solution
A current sensor design featuring a housing with a magnetic core and a spacer structure that stabilizes the gap, using a metal spacer to prevent contaminants and allow full curing of epoxy at high temperatures while protecting the Hall sensing element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If epoxy is used as protective material for Hall sensing elements, then protection from contaminants is improved, but insufficient curing occurs due to contaminants and temperature constraints
Solution Approach 1:
A spacer structure is introduced as an intermediary component between the magnetic core and the epoxy. This spacer prevents contaminants from the magnetic core from mixing with the epoxy, allowing the epoxy to cure properly without contamination while still providing protective coverage for the Hall sensing element.
Solution Approach 2:
The curing temperature parameter is changed from standard temperatures to elevated temperatures (125°C or higher). This parameter change enables complete curing of the epoxy while the spacer structure simultaneously prevents contamination that would otherwise occur at these temperatures, resolving the contradiction between curing completeness and protection reliability.
2Manufacturing precision
If high curing temperature (125°C or above) is applied to epoxy, then complete curing is achieved, but electrical components may be damaged
Solution Approach 1:
The spacer structure serves as a thermal intermediary that isolates the epoxy curing process from the electrical components. It allows high curing temperatures to be applied to the epoxy without transmitting excessive heat to the sensitive electrical components, enabling complete curing while preventing thermal damage.
Solution Approach 2:
Different temperature conditions are applied to different parts of the system: high temperature (125°C+) is applied locally to the epoxy for complete curing, while the electrical components are protected from excessive heat through the spacer structure. This local differentiation of thermal conditions resolves the contradiction between curing completeness and component safety.
3Manufacturing precision
If spacer structure is added to prevent contaminants, then epoxy curing is improved, but device complexity increases
Solution Approach 1:
The device is segmented into distinct functional components: the magnetic core, the spacer structure, and the epoxy-protected Hall sensing element. This segmentation allows the spacer to be designed as a simple, dedicated component whose sole function is to prevent contamination and enable proper curing, achieving manufacturing precision without excessive overall complexity.
Solution Approach 2:
The spacer structure is designed as a simple intermediary component with minimal complexity. It performs the critical function of preventing contamination and enabling epoxy curing without introducing complex mechanisms, thereby resolving the contradiction between achieving complete curing and maintaining device simplicity.
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 ensures complete curing of the epoxy at or above 125 degrees Celsius, effectively protecting the Hall sensing element from contaminants and high temperatures, thereby enhancing measurement accuracy.
Implementation Method 1
the epoxy is configured to cure at or above 125 degrees Celsius
Data Source
Figure 1
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Figure 3A~3B
AI summary
A current sensing system may include a housing having a chamber configured to contain an epoxy, the housing further comprising a magnetic core having a gap configured to surround the chamber and a spacer structure mechanically coupled to the magnetic core configured to stabilize the gap of the magnetic core. The current sensing system may further include a Hall sensing element comprised within the chamber and surrounded by the epoxy. The spacer structure may be further configured to allow the epoxy to sufficiently cure at temperatures at or above a predetermined threshold.