Cable Shield Connecting Assembly for Electric Motor Grounding
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Solution Overview
Problem
Existing cable fixation methods for electric rotary motors are cumbersome, costly, and inefficient in securing and grounding braided shielding, often requiring manual adjustment and protruding components that compromise motor size and safety.
Innovation Solution
A cable shield connecting assembly featuring a mounting plate with a cavity and grommet, where a clamp or washer is press-fitted against the grommet to secure and cut braided shielding, eliminating the need for additional clamps and reducing assembly complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cable glands are used to secure and ground cables to the housing, then reliable cable fixation and grounding are achieved, but the assembly becomes more expensive and complex
Solution Approach 1:
The patent combines the cable securing function and the grounding function into a single integrated mounting plate assembly. The mounting plate simultaneously provides mechanical support for the cable gland and establishes electrical ground connection through its contact with the housing, eliminating the need for separate grounding components and reducing assembly complexity.
Solution Approach 2:
The mounting plate serves multiple functions: it provides mechanical support for the cable gland, establishes electrical ground connection, and structurally integrates with the housing. This multi-functional design replaces what would traditionally require multiple separate components, reducing both cost and complexity while maintaining reliability.
2Ease of manufacture
If grommets made of insulating material are used to secure cables, then cost is reduced, but additional clamps are required for grounding which protrude and increase motor size
Solution Approach 1:
The mounting plate integrates the grounding function directly into the cable securing assembly. By providing a ground contact surface on the mounting plate itself, the invention eliminates the need for separate protruding clamps, thereby maintaining the cost benefits of using insulating grommets while avoiding the space penalty of additional grounding components.
Solution Approach 2:
The invention extracts the grounding function from separate protruding clamps and integrates it into the mounting plate structure. This removes the harmful protruding elements that increase motor height while preserving the essential grounding capability through the mounting plate's contact with the housing.
3Reliability
If manual adjustment and cutting of braided shielding is required, then proper grounding can be achieved, but labor time and assembly complexity increase
Solution Approach 1:
The mounting plate is pre-configured with an integrated ground contact surface and structured to automatically position and secure the braided shielding during assembly. This preliminary preparation of the mounting plate structure enables the braided shielding to be grounded and secured in a single operation without requiring manual adjustment or separate cutting steps, reducing assembly time while maintaining grounding effectiveness.
Data Source
Figure 1~5
Figure 6~9
AI summary
The present invention relates to a cable shield connecting assembly (10) for securing and grounding a cable (30) to the housing of an electrical device. The cable (30) comprises a cable jacket (32) and braided shielding (34) extending from an end portion of the cable jacket (32). The cable shield connecting assembly (10) comprises: i) a mounting plate (20) having a cavity (22) and an aperture (24) arranged on a bottom side of the cavity (22), and ii) a grommet (12) having an inner diameter inside which the end portion of the cable jacket (32) is fitted, and upper and lower portions (14a, 14b) extending on both sides of an edge of the aperture (24) of the mounting plate (20), wherein the upper portion (14a) of the grommet (12) is fitted inside the cavity (22). The cable shield connecting assembly (10) further comprises a clamp (16) pressed-fitted against the upper portion (14a) of the grommet (12) inside said cavity (22) to squeeze therebetween said braided shielding (34).