Conductive Plug Housing Grounding for Dynamoelectric Machines
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Solution Overview
Problem
In dynamoelectric machines with multi-part plug housings, the risk of conductive connection failure at pivot joints poses a challenge for ensuring adequate protective grounding, particularly in compact designs with low axle height, where separate grounding lines are costly and complicated to mount, potentially compromising operator safety.
Innovation Solution
A flexible electric grounding line, configured as a coil, connects electrically conductive housing parts of the plug housing directly to the motor housing, ensuring continuous grounding even if the pivot joint fractures, and uses a grounding pin and flange for contact with the motor housing, avoiding mechanical loading and complex mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate grounding line is installed from the plug to the motor housing, then operator protection is ensured, but the device complexity and mounting complexity increase
Solution Approach 1:
The grounding function is merged with the plug housing structure itself. The plug housing is made electrically conductive and serves both as a structural component and as a grounding path, eliminating the need for separate grounding lines while ensuring operator protection.
Solution Approach 2:
The plug housing is designed to perform multiple functions: mechanical connection, electrical connection, and grounding. By making the housing electrically conductive and providing a grounding contact at the motor housing interface, it serves as both a structural element and a protective grounding path.
2Reliability
If the plug housing is made of electrically conductive material, then grounding is improved, but the cost and manufacturing complexity increase
Solution Approach 1:
The grounding function is combined with the existing plug housing structure. Instead of adding separate grounding components, the housing itself is made electrically conductive and integrated with the grounding contact, reducing component count and manufacturing complexity.
Solution Approach 2:
The plug housing material is selected to provide both structural and electrical grounding functions. This multi-functionality eliminates the need for additional grounding-specific components, thereby reducing overall manufacturing cost and complexity.
3Reliability
If a rigid grounding connection is used, then grounding reliability is improved, but the adaptability to different positions and orientations is reduced
Solution Approach 1:
The grounding connection is made flexible through the use of a flexible cable rather than a rigid conductor. This allows the grounding path to adapt to different plug positions and orientations while maintaining electrical continuity and grounding reliability.
Solution Approach 2:
A flexible cable is used for the grounding connection between the plug housing and motor housing. This flexible conductor can bend and adapt to various mounting positions and orientations while maintaining reliable electrical contact for grounding.
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 solution ensures reliable protective grounding and operator safety by maintaining the grounding connection, even in the event of pivot joint failure, without the need for additional costly grounding lines, simplifying assembly and reducing contact resistance through clean, oxide-free surfaces.
Implementation Method 1
a flexible electric line connecting the at least one housing part of electrically conductive material to at least one of the plugging elements
Implementation Method 2
The flexible electric line, configured as a coil, connects electrically conductive housing parts of the plug housing directly to the motor housing
Data Source
AI summary
A dynamoelectric machine includes a stator in which a winding system is positioned, and at least a multi-part plug housing with a pivot joint between housing parts of the plug housing. The plug housing has at least one plug-type connector with at least two plugging elements. At least one housing part of the plug housing is made of electrically conductive material and connected to at least one plugging element by a flexible electric line. The electrically conductive housing part of the plug housing faces the dynamoelectric machine and is connected in an electrically conductive fashion to an electrically conductive surface of a motor housing of the dynamoelectric machine.