Electric Machine Casing with Sound-Absorbing Jacket
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Solution Overview
Problem
Electrical machines often produce loud noises due to electromagnetic excitation and air flow in the cooling circuit, and existing noise reduction methods are either costly or complex to implement.
Innovation Solution
A casing design for electrical machines that incorporates sound-absorbing and vibration-damping materials, a multi-part construction with a fan casing and stator casing, and the use of elastic materials for secure attachment, along with air baffles and guide vanes to direct cooling air effectively, reducing noise emission while maintaining efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If sound-absorbing and vibration-damping materials are integrated into the casing, then noise emission is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple functions into a single integrated casing structure. The casing incorporates sound-absorbing material, vibration-damping material, and cooling channel integration all within one component, eliminating the need for separate noise reduction components and simplifying the overall device structure.
Solution Approach 2:
The casing serves multiple functions simultaneously: it provides structural support, reduces noise through sound-absorbing and vibration-damping materials, enables cooling through integrated channels, and secures the rotor assembly. This multi-functionality reduces the need for additional separate components.
2Object-generated harmful factors
If the casing is made thicker to improve noise reduction, then noise emission is reduced, but weight and manufacturing cost increase
Solution Approach 1:
The patent uses composite material structures within the casing, combining sound-absorbing materials with vibration-damping materials in specific layers or zones. This allows effective noise reduction without requiring uniform thickness increases throughout the entire casing, thereby controlling weight.
Solution Approach 2:
The casing applies different material properties and thicknesses in different locations based on local noise and vibration requirements. Sound-absorbing material is placed in areas where airborne noise is predominant, while vibration-damping material is applied where structural vibrations are strongest, optimizing noise reduction efficiency while minimizing weight.
3Object-generated harmful factors
If elastic material is used for pressing the casing onto cooling ribs, then noise reduction is improved, but manufacturing cost increases
Solution Approach 1:
The elastic material integrated into the casing automatically provides the pressing force needed to secure the casing onto the cooling ribs without requiring additional fastening mechanisms or assembly steps. The material's inherent elasticity creates continuous contact pressure that secures the assembly and reduces noise simultaneously.
4Temperature
If cooling channels are integrated into the casing, then cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The cooling channels are integrated directly into the casing structure, combining the cooling system with the noise reduction housing. This eliminates the need for separate cooling components and simplifies the overall device architecture while maintaining effective cooling through the stator and rotor.
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 proposed solution effectively reduces noise pollution by absorbing and decoupling sound, improving cooling efficiency, and simplifying assembly and maintenance, while being cost-effective and easy to implement.
Implementation Method 1
the casing has a material which is sound-absorbing. In this way, sound which, for example, hits the inside of the jacket can be at least partially absorbed
Implementation Method 2
the casing has a material that absorbs vibrations. Vibrations are thus damped, so that noise from the electrical machine is reduced due to fewer vibrations in the casing
Implementation Method 3
an elastic material is provided for exerting a pressing force of the casing on the cooling fins. This elastic material has a rubber, for example
Implementation Method 4
A cooling channel is formed by at least two cooling fins and a jacket of the electrical machine. A fluid, such as air, can be guided through the cooling channel
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
In an electric machine (1) with cooling fins (2, 3, 4, 5, 6), cooling channels (7, 8, 9) are formed by the cooling fins (2, 3, 4, 5, 6) and a jacket (10). The jacket (10) is made of a vibration-absorbing material. This minimizes the noise generated by the electric machine.