Electric Motor Casing Ribs Welding for Leakage Prevention
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Solution Overview
Problem
Existing electric motor cooling systems face issues with mechanical strength, material corrosion, leakage risks, and complex manufacturing processes due to multi-part casings and sealing methods, which affect reliability and maintenance needs.
Innovation Solution
A one-piece casing with ribs is used, where the closing structure is fastened only to the ribs via welding, brazing, or crimping, allowing for localized deformations and eliminating the need for mechanical seals, enabling the use of low thermal conductivity materials like stainless steel and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the casing is made up of multiple parts joined by screw-fastened connections, then the assembly is easier to manufacture, but the mechanical strength is reduced
Solution Approach 1:
The patent merges multiple casing parts into a single one-piece casing structure. The closing structure is integrated directly with the casing body through welding/brazing at the ribs, eliminating the need for separate components and screw-fastened connections. This integration maintains mechanical strength while simplifying the assembly process.
2Strength
If the casing thickness is increased to house screws and seals, then the mechanical strength is improved, but the thermal conductivity is reduced
Solution Approach 1:
The patent eliminates the need for separate screw and seal components by integrating the closing structure directly into the casing. This allows for optimal casing thickness that maintains both mechanical strength and thermal conductivity, as the thickness is determined by structural requirements rather than component accommodation.
Solution Approach 2:
The patent replaces mechanical sealing systems (screws and elastomer O-rings) with a welded/brazed joint system. This substitution eliminates the need for thick casing sections to accommodate these components, allowing for thinner walls that maintain better thermal conductivity while achieving sealing through metallurgical bonds.
3Reliability
If material with high thermal conductivity is used for the casing, then the cooling efficiency is improved, but the corrosion resistance is reduced
Solution Approach 1:
The patent employs composite material strategies through the welding/brazing process, joining materials with different properties to create a unified structure that combines the thermal conductivity of aluminum alloys with the corrosion resistance of stainless steel or other resistant materials.
4Strength
If welding or brazing is used to join casing parts, then the mechanical strength is improved, but the geometric precision is reduced
Solution Approach 1:
The patent merges the closing structure with the casing body in a single integrated manufacturing process. By forming the ribs and closing structure as one piece or pre-assembled unit before final welding/brazing, the geometric precision is maintained throughout the process, eliminating the need for post-welding finishing operations.
5Reliability
If seals are used to prevent leakage, then the sealing effectiveness is improved, but the reliability over time is reduced
Solution Approach 1:
The patent replaces elastomer O-ring seals with welded or brazed joints for sealing. This substitution eliminates the time-dependent deterioration characteristic of elastomeric materials, providing a permanent metallurgical seal that maintains its integrity throughout the service life of the motor without requiring maintenance or replacement.
6Ease of manufacture
If multiple components are assembled with seals, then the assembly is easier to manufacture, but the leakage risk is increased
Solution Approach 1:
The patent merges multiple sealing interfaces into a single welded/brazed joint between the closing structure and the casing ribs. This integration eliminates the multiple potential leakage paths associated with assembled components and elastomeric seals, providing a unified metallurgical seal that maintains both manufacturability and reliability.
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 mechanical robustness, reduces manufacturing complexity and costs, minimizes leakage risks, and extends service life by eliminating the need for heat treatment and finishing operations, while maintaining effective cooling and corrosion resistance.
Implementation Method 1
the closing structure is fastened to the first face of the casing by welding and/or brazing and/or crimping
Implementation Method 2
the closing structure is fastened to the first face of the casing by welding and/or brazing and/or crimping
Implementation Method 3
a fluid for cooling the machine... intended to be in contact with a fluid for cooling the motor
Implementation Method 4
the fluid flowing between the casing and the component... is sealed off from the motor cavity
Data Source
AI summary
The invention relates to an electrical machine comprising a stator and a rotor that are disposed in a casing comprising a first face provided with ribs and intended to be in contact with a cooling fluid, the machine being provided with a closing structure which is fastened in a leaktight manner to the first face of the casing so as to delimit with the first face of the casing a space forming a circuit for the cooling fluid of the motor, the closing structure being fastened to the first face of the casing by welding and/or brazing and/or crimping and comprising at least one cover, characterized in that the closing structure is fastened to the casing by welding and/or brazing and/or crimping only at said ribs.