Power Electronics Case with Polymer-Filled Recessions for NVH Dampening
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Solution Overview
Problem
Devices and components often emit noise, vibration, and harshness during operation, leading to user discomfort and fatigue, as existing technologies fail to effectively mitigate these issues.
Innovation Solution
An integrated power electronics component featuring a metal case with recessions or protrusions filled with a cured polymer composition, which enhances sound dampening capabilities while providing increased stiffness and strength, and optionally includes a metallic layer for electromagnetic interference shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal case is used to provide structural strength and stiffness, then mechanical strength and stiffness are improved, but sound dampening capability deteriorates
Solution Approach 1:
The patent applies composite materials by combining a metal case with polymer material filled in recessions or protrusions. The metal case provides structural strength and stiffness, while the polymer filling provides sound dampening capability. This composite structure resolves the contradiction by integrating two materials with complementary properties into a single functional component.
2Object-generated harmful factors
If the case structure is modified to add sound dampening features, then sound dampening capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the sound dampening function with the case structure by integrating polymer material directly into the case design through recessions or protrusions. Instead of adding separate sound dampening components, the dampening function is combined with the structural case, thereby improving sound dampening capability while minimizing increases in device complexity.
3Object-generated harmful factors
If multiple layers are added to the case for enhanced EMI shielding and sound dampening, then protective capability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the case structure to simultaneously provide structural support, sound dampening, and EMI shielding capabilities. The recessions or protrusions filled with polymer material serve multiple functions: structural reinforcement, sound dampening through vibration absorption, and when combined with conductive materials, EMI shielding. This multi-functional design improves protective capability while avoiding the need for separate components that would increase manufacturing complexity.
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 effectively reduces noise, vibration, and harshness, improving the operating environment and delaying user fatigue, while maintaining excellent mechanical properties and scalability for mass production.
Implementation Method 1
a cured polymer formed from a composition disposed on at least one of the first surface and the second surface in each of the plurality of recessions to thereby dampen the sound wave
Implementation Method 2
The integrated power electronics component may further include a second layer disposed on the cured polymer, formed from a metallic composition, and configured for shielding the case from electromagnetic interference
Data Source
AI summary
An integrated power electronics component configured for mitigating noise, vibration, and harshness includes a case formed from metal and configured to dampen a sound wave having a first frequency and a first amplitude and propagatable in a first direction. The case has a first surface and a second surface spaced apart from the first surface, a first stiffness, and a first strength, and the first and second surfaces include a structure defining a plurality of recessions therein. The component includes a cured polymer formed from a composition disposed on at least one of the first and second surfaces in each of the recessions to thereby dampen the sound wave in the first direction and in a second direction that is perpendicular to the first direction to a second frequency that is less than the first frequency and a second amplitude that is less than the first amplitude.