Rotary Electric Machine Noise Insulation Plate Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotary electric machines face challenges in noise reduction due to the need for additional equipment like noise insulation enclosures, which increase space requirements, pose safety risks, and complicate structures, while acoustic absorbents can be fragile and affect cooling performance, and increasing stator frame thickness adds weight.
Innovation Solution
A rotary electric machine design featuring a stator and rotor with acoustic absorbents on the outer surface, divided noise insulation plates, and a T-shaped attaching seat with elastic and vibration-proofing components, allowing for effective sound insulation without additional equipment or significant weight increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a noise insulation enclosure is used to control noise, then noise control is improved, but device complexity and space requirements increase
Solution Approach 1:
The noise insulation plates are integrated into the stator frame structure, with attaching seats formed directly on the stator frame. This nesting approach embeds the noise insulation function within the existing structural framework, eliminating the need for separate external noise insulation enclosures and reducing overall device complexity.
Solution Approach 2:
The noise insulation plates are combined with the stator frame to form an integrated assembly. The attaching seats are formed directly on the stator frame, merging the structural support function with the noise insulation mounting function, thereby simplifying the overall structure while maintaining effective noise control.
2Object-affected harmful factors
If acoustic absorbent is attached to inner side of stator frame, then noise reduction is improved, but reliability deteriorates due to fragility and cooling performance impact
Solution Approach 1:
The noise insulation plates are made from molded resin material that is inexpensive and can be easily replaced if needed. This approach uses durable yet replaceable components rather than fragile acoustic absorbent materials, improving reliability while maintaining noise reduction effectiveness.
Solution Approach 2:
The noise insulation plates are constructed from molded resin composite materials that combine durability with noise insulation properties. This composite material approach provides both structural stability and acoustic insulation functionality, resolving the contradiction between reliability and noise reduction.
3Object-affected harmful factors
If stator frame thickness is increased for noise control, then noise control is improved, but weight increases
Solution Approach 1:
Instead of increasing the overall stator frame thickness, the noise insulation function is segmented into separate plates that are attached to the stator frame. This segmentation allows noise control to be achieved without adding to the base structural weight, as only the specific noise insulation components are added rather than the entire frame.
Solution Approach 2:
The noise insulation function is extracted from the stator frame structure itself and implemented as separate attachable plates. This extraction allows the stator frame to maintain its original thin, lightweight design while still achieving effective noise control through the added insulation plates.
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 design achieves low noise levels with a simple structure, minimizing weight increase and eliminating the need for extra equipment, while ensuring safety and maintaining cooling performance.
Implementation Method 1
an elastic body is arranged between the noise insulation plate attaching seat and the noise insulation plate
Implementation Method 2
a vibration-proofing means is provided between the noise insulation plate and the fastening means
Implementation Method 3
an acoustic absorbent arranged on an outer surface of the stator frame
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
If the whole of a rotary electric machine is surrounded by a noise insulation enclosure, there is a problem that a space for installing the noise insulation enclosure is necessary around the rotary electric machine, and a base for installing the noise insulation enclosure is necessary. The noise insulation enclosure reduces a noise in an outer portion of the noise insulation enclosure, however, it is necessary for an inspection worker to enter into the enclosure, and there is a risk that the inspecting worker entering into the noise insulation enclosure is exposed to a loud noise of the rotary electric machine. In a power generator provided with a stator frame (1) having a stator iron core incorporating a stator coil therein in an inner portion thereof, and a rotor (2) in which a rotor coil rotating so as to oppose to the stator frame (1) and the stator iron core is incorporated, the power generator is provided with a noise insulation plate (4) fixed to a noise insulation plate attaching seat (3) welded to an outer surface of the stator frame (1) by a bolt (7) and a nut (5), an elastic body (a gasket) (11) is provided in a contact portion between the noise insulation plate attaching seat (3) and the noise insulation plate (4), and a vibration-proofing rubber washer (10) is provided in a contact portion between the noise insulation plate (4) and the nut (5).