Flexible Grounding Component for Thermal Expansion in Motor Cases
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Solution Overview
Problem
Conventional grounding components fail to maintain a stable ground circuit in severe temperature environments due to expansion and contraction of motor components, leading to loosening of screws and potential breakage during maintenance or inspection.
Innovation Solution
A component for grounding with a contact-avoiding shape, such as a U-shape, is positioned between the motor case and the plug, ensuring electrical connection without direct contact with the connector, thereby maintaining durability even in extreme temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plate-like metal fitting is used as a grounding component and fastened with screws, then electrical connection can be established, but the ground circuit cannot be maintained in severe temperature environments due to expansion and contraction causing loosening
Solution Approach 1:
The grounding component is designed with a flexible structure that can dynamically adapt to thermal expansion and contraction of surrounding components. The flexibility allows the grounding element to maintain contact pressure and electrical connection without requiring rigid fastening, thus resolving the contradiction between establishing electrical connection and maintaining fastening stability under temperature variations.
Solution Approach 2:
The grounding component utilizes changes in physical parameters (such as elasticity and contact pressure) to maintain reliable electrical connection. By designing the grounding element to undergo controlled deformation in response to temperature changes, the system maintains stable electrical connection without relying on rigid mechanical fastening, thereby resolving the contradiction between connection establishment and fastening stability.
2Reliability
If a plate-like metal fitting is positioned between the connector and the second housing, then ground circuit can be formed, but breakage may occur during maintenance or inspection
Solution Approach 1:
The grounding component is designed as a flexible element that can bend and deform without breaking. This flexibility allows the grounding component to withstand mechanical stresses during maintenance and inspection operations, preventing breakage while maintaining its grounding function. The flexible structure absorbs mechanical energy that would otherwise cause fracture, resolving the contradiction between ground circuit formation and structural durability.
Solution Approach 2:
The grounding component serves as a flexible intermediary element between rigid components (connector and housing). This intermediary nature allows it to accommodate relative movements and stress concentrations that occur during maintenance, protecting the more brittle grounding metal fitting from breakage while maintaining electrical connection.
3Reliability
If screws are used to fasten the grounding metal fitting, then electrical connection is established, but the screws loosen due to thermal expansion and contraction
Solution Approach 1:
The invention extracts the fastening function from the grounding component design, eliminating the need for screws and mechanical fastening. By using a flexible grounding element that maintains contact through elasticity rather than mechanical fastening, the system achieves reliable electrical connection without the maintenance issues associated with loosening screws, thereby resolving the contradiction between electrical connection reliability and maintenance ease.
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 component effectively maintains a stable ground circuit in severe temperature environments, preventing connector damage and ensuring reliable electrical connections during temperature fluctuations and maintenance operations.
Implementation Method 1
one or both of expansion and contraction after such expansion of each component of the motor, more specifically, expansion of a component such as the second housing composed of an 'insulator' or the connector
Implementation Method 2
contraction in the process of returning to an ambient temperature after removal from the high temperature tester
Data Source
AI summary
A component for grounding having conductivity includes a first face positioned opposite a first motor case having conductivity, a second face positioned opposite a second motor case having an insulating property and positioned opposite the first motor case, and a third face positioned opposite a plug having conductivity. The first and third faces and the second face are in a front-back relation in the component for grounding, and the first face and the third face are contiguous to each other for an electrical connection between the first motor case and the plug. The second motor case is provided with a connector couplable with the plug, and, on the second motor case, at least a part of the third face has a contact-avoiding shape.