Dynamo-Electric Machine Insulation Composite for High-Temperature Stress
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Solution Overview
Problem
Dynamo-electric machines used in depleted well fields face challenges with high-voltage, high-heat, and stress resistance due to the use of inorganic insulation materials, which are prone to cracking and degradation, leading to poor mechanical properties and short insulation life.
Innovation Solution
A dynamo-electric machine design incorporating a combination of organic and inorganic insulation materials, with a dense inorganic insulant layer to prevent voids and partial discharge, and an organic insulant with high thermal conductivity to enhance heat resistance, allowing for improved mechanical and thermal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If only inorganic insulation material is used, then heat resistance is improved, but mechanical properties deteriorate due to cracking and exfoliation
Solution Approach 1:
The patent applies composite materials by combining organic insulation material (first insulating layer) and inorganic insulation material (second insulating layer) to create a multi-layer insulation structure. The organic layer provides mechanical flexibility and stress resistance, while the inorganic layer provides heat resistance, thus resolving the contradiction between mechanical properties and heat resistance.
2Temperature
If inorganic insulation material with porous structure is used, then heat resistance is improved, but reliability deteriorates due to cracks and exfoliation
Solution Approach 1:
The composite insulation structure combines the heat resistance of inorganic material with the crack-resistant properties of organic material. The organic first insulating layer prevents crack propagation and exfoliation that would otherwise occur in the porous inorganic second insulating layer, thereby improving reliability and insulation life while maintaining heat resistance.
Solution Approach 2:
The organic first insulating layer acts as a protective cushioning layer that prevents cracks and exfoliation from developing in the inorganic second insulating layer. This beforehand protection ensures that the inorganic layer maintains its heat resistance properties without the reliability issues caused by its porous structure.
3Ease of manufacture
If simple inorganic insulation is used, then manufacturing is simplified, but stress resistance deteriorates under high-speed rotation and vibration
Solution Approach 1:
The patent uses composite materials where the organic first insulating layer provides stress resistance under high-speed rotation and vibration, while the inorganic second insulating layer provides heat resistance. This composite structure maintains reasonable manufacturing simplicity while significantly improving stress resistance compared to simple inorganic insulation.
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 provides a dynamo-electric machine with extended insulation life of over 20 years, capable of operating at 170 °C and withstanding high stress, suitable for deep well field applications, while maintaining high-voltage resistance.
Implementation Method 1
an organic insulant with high thermal conductivity to enhance heat resistance
Data Source
Figure 1~2
Figure 3
AI summary
The present invention aims to provide a dynamo-electric machine allowing high-voltage resistance, high-heat resistance, and stress resistance to improve. The object can be attained by providing a dynamo-electric machine having a stator 100 or a rotor including a wound coil, a slot core 9 containing the wound coil, a first insulant arranged around the wound coil and mainly formed of an inorganic material, and a second insulant arranged between the inorganic insulant and the slot core and mainly formed of an organic material.