Electromechanical Switch Assembly to Minimize Magnetic Circuit Air Gaps
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Solution Overview
Problem
The formation of air gaps during the assembly of electromechanical switching devices, such as contactors and relays, compromises magnetic circuit performance due to variations in manufacturing and assembly, leading to reduced magnetic force and increased contact resistance.
Innovation Solution
A method involving precise insertion and alignment of components, including a coil yoke with outward-bent arms, to minimize air gaps by fully inserting a lower static core into a core cavity, and applying external forces to align and fasten components, ensuring seamless integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple components are assembled to form the magnetic circuit pathway, then manufacturing cost is reduced through looser tolerances, but air gaps form between components reducing magnetic force
Solution Approach 1:
The patent combines multiple magnetic circuit components (base section, arms, and core) into a single integrated structure. This merging eliminates the air gaps that would exist between separate components while maintaining manufacturing feasibility, thereby preserving magnetic force without requiring excessively tight tolerances across multiple parts.
Solution Approach 2:
The patent incorporates preliminary positioning features and alignment mechanisms during the manufacturing of the integrated magnetic circuit. By pre-establishing precise geometric relationships between what would otherwise be separate components, the design ensures proper alignment and minimizes air gaps before final assembly, resolving the contradiction between ease of manufacture and magnetic force.
2Ease of manufacture
If multiple components are assembled with looser tolerances, then manufacturing cost decreases, but air gaps increase causing flux lines to escape and saturate material
Solution Approach 1:
By merging the magnetic circuit components into an integrated structure, the patent eliminates the interfaces where air gaps would form. This single-piece construction inherently maintains consistent magnetic flux pathways without the reliability issues caused by assembly tolerances, while still allowing for cost-effective manufacturing of the integrated component.
Solution Approach 2:
The patent utilizes composite construction methods or material integration techniques to create the magnetic circuit. By employing composite approaches, the design achieves consistent magnetic properties throughout the structure without relying on tight tolerances between separate components, thereby maintaining reliability while facilitating easier manufacturing.
3Force
If components are precisely aligned to eliminate air gaps, then magnetic force increases, but assembly complexity and cost increase
Solution Approach 1:
The patent resolves assembly complexity by merging multiple components into a single integrated magnetic circuit structure. This eliminates the need for complex alignment procedures during assembly, as the components are already precisely positioned relative to each other in the integrated design, while still achieving the high magnetic force required.
Solution Approach 2:
The patent incorporates preliminary alignment and positioning features directly into the integrated magnetic circuit design. By pre-establishing the precise geometric relationships between components during manufacturing rather than during assembly, the patent achieves high magnetic force without increasing assembly complexity or cost.
4Reliability
If air gaps are reduced between components, then magnetic efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
By merging the magnetic circuit components into an integrated structure, the patent eliminates the need for tight tolerances between separate components. The single-piece construction inherently maintains consistent spacing and alignment, achieving high magnetic efficiency without the manufacturing precision requirements that would be necessary if multiple components were assembled.
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 approach enhances magnetic force generation and reliability by eliminating or reducing air gaps, maintaining consistent power consumption and improving device performance.
Implementation Method 1
Central to their functionality are magnetic circuits, integrated to guide and harness the electromagnetic fields generated by the device's coils. This magnetic field serves as the driving force behind the actuation of the switching device.
Implementation Method 2
magnetic circuits, integrated to guide and harness the electromagnetic fields generated by the device's coils
Data Source
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Figure 3A
AI summary
In a particular embodiment, a method of assembling an electromechanical switching device is disclosed that includes partially inserting a lower static core into a core cavity of a coil assembly having a plurality of components including a plunger assembly enclosure and a coil enclosure. In this embodiment, the core cavity is formed by the plunger assembly enclosure and the coil enclosure. The method also includes positioning the coil assembly within a coil yoke and pushing the coil assembly into the coil yoke such that the lower static core is fully inserted in the core cavity.