Motor Damping Member Using Composite Constraining Layer
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Solution Overview
Problem
Conventional damping members with metal constraining layers face challenges in uniform bonding to non-flat motor housings, leading to ineffective shear deformation and increased structure-borne noise, while also being poor heat dissipators due to low thermal conductivity.
Innovation Solution
A damping member with a constraining layer made of a resin or elastomer mixed with an inorganic compound, such as polyvinyl chloride and barium sulfate, is used, providing flexibility and improved thermal conductivity to enhance bonding and heat dissipation, thereby reducing vibrations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal constraining layer is used in the damping member, then the damping performance is improved, but the bonding uniformity to non-flat motor housing deteriorates and structure-borne noise increases
Solution Approach 1:
The patent uses a composite constraining layer made of resin or elastomer mixed with inorganic compounds (such as metal powder, oxide powder, or carbonate powder) instead of pure metal. This composite structure combines the flexibility and bonding capability of polymers with the density and damping effectiveness of inorganic materials, resolving the contradiction between damping performance and bonding uniformity
Solution Approach 2:
The patent changes the material parameters of the constraining layer by adjusting the type, amount, and particle size of inorganic compounds mixed into the resin or elastomer. This allows optimization of both bonding characteristics and damping performance according to specific application requirements
2Reliability
If the thickness of the damping member is increased to improve damping performance, then the vibration reduction is enhanced, but the heat dissipation efficiency deteriorates
Solution Approach 1:
The constraining layer uses composite materials with inorganic compounds that have high thermal conductivity (such as metal powder or oxide powder) mixed into the resin or elastomer matrix. This allows the damping member to maintain sufficient thickness for effective damping while the inorganic compounds provide enhanced heat dissipation pathways
Solution Approach 2:
The constraining layer is designed to perform multiple functions simultaneously: providing mechanical constraint for shear deformation, enhancing damping performance through inorganic compound density, and improving heat dissipation through thermally conductive inorganic materials. This multi-functionality resolves the contradiction between damping performance and heat dissipation
3Reliability
If the damping member is bonded to the motor housing, then the vibration reduction is achieved, but the heat dissipation from the motor housing deteriorates due to thermal insulation
Solution Approach 1:
The constraining layer incorporates inorganic compounds with high thermal conductivity (metal powder, oxide powder, or carbonate powder) into the resin or elastomer matrix. This composite structure maintains the bonding and damping functions while creating thermal conduction pathways that enable effective heat dissipation from the motor housing through the damping member
Solution Approach 2:
The patent converts the previously harmful thermal insulation effect of the damping member into a beneficial heat dissipation function by incorporating thermally conductive inorganic compounds. The same constraining layer that provides mechanical constraint now also serves as a thermal management pathway
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 structure-borne noise and improves heat dissipation efficiency, maintaining damping performance across various temperatures without requiring design changes in motor components.
Implementation Method 1
the damping layer undergoes shear deformation. Thus, vibration energy is converted into thermal energy in the damping layer, whereby vibrations are reduced
Implementation Method 2
the thermal conductivity of the constraining layer is improved by mixing the inorganic compound in at least one of the resin and elastomer used to form the constraining layer. Thus, the constraining layer efficiently dissipates the heat generated in the motor housing
Data Source
AI summary
A motor includes a motor housing, a motor body, and a damping member. The motor body includes a drive shaft. The motor body is housed in the motor housing. The damping member is disposed on an outer surface of the motor housing. The damping member includes a damping layer and a constraining layer. The damping layer is made of an organic polymeric material, and bonded to the outer surface of the motor housing. The constraining layer is made of at least one of a resin mixed with an inorganic compound and an elastomer mixed with an inorganic compound. The constraining layer is disposed on the damping layer.