Electric Machine Plastic Components Moisture Absorption
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Solution Overview
Problem
Rotary electric machines with sealed casings tend to experience unwanted opening due to steam buildup from moisture absorption in plastic components, leading to increased pressure and separation of the cover and body during high-temperature operations.
Innovation Solution
Using plastic materials with moisture absorption at saturation less than 0.8%, such as PBT, PET, or PCT, for insulating, supporting, and cooling components to prevent steam formation and maintain casing integrity under heavy-duty conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic components with high moisture absorption (e.g., PA66) are used for insulating and supporting functions, then manufacturing ease and electrical insulation are improved, but steam formation increases causing casing opening during heavy-duty operation
Solution Approach 1:
The patent changes the material parameter of moisture absorption from above 0.8% (PA66) to below 0.8% (PBT, PET, or PCT), fundamentally altering the steam generation behavior during high-temperature operation while maintaining manufacturing feasibility
Solution Approach 2:
The patent specifies using plastic materials with specific moisture absorption characteristics (PBT, PET, or PCT) that combine low moisture absorption properties with adequate electrical insulation and mechanical strength, creating an optimized composite solution for the sealing environment
2Reliability
If plastic components are used for insulating and supporting functions, then electrical insulation is improved, but steam formation from moisture absorption causes pressure increase and casing separation
Solution Approach 1:
The patent changes the material parameter of moisture absorption from above 0.8% to below 0.8%, fundamentally altering the steam generation behavior during high-temperature operation while maintaining adequate electrical insulation properties
Solution Approach 2:
The patent converts the potential harm of moisture absorption into a benefit by selecting materials that inherently absorb minimal moisture, thereby eliminating steam formation as a harmful factor while maintaining the insulating function
3Device complexity
If conventional plastic materials are used in sealed machines, then manufacturing simplicity is maintained, but pressure buildup from steam causes cover and body separation
Solution Approach 1:
The patent changes the material parameter of moisture absorption from above 0.8% to below 0.8%, fundamentally altering the pressure buildup behavior during high-temperature operation while maintaining manufacturing simplicity and structural integrity
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
Prevents the cover and body from coming apart by minimizing water presence and steam formation, enhancing the reliability and durability of rotary electric machines for heavy-duty applications.
Implementation Method 1
the water which is absorbed by the material the plastic components are made of and which is given off in the form of vapour when the interior of the motor exceeds certain temperatures
Implementation Method 2
the water which is absorbed by the material the plastic components are made of and which is given off in the form of vapour
Data Source
AI summary
An electric machine comprises a sealed outer casing defined by a body and by a cover coupled to the body, a stator and a rotor the latter two being mounted inside the casing; the stator is of a wound type and comprises a core having at least two pole pieces and a plurality of windings each defined by a conductor wire wound in a plurality of coils around the pole pieces; the electric machine further comprises a plurality of plastic components located inside the casing and made of a plastic material whose moisture absorption at saturation is less than 0.8%, having insulating and/or supporting and/or cooling functions.