Magnet Pole Encapsulation with Elastic Section
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Solution Overview
Problem
Magnet poles in magnetic levitation systems face issues with protective layer tearing due to thermal expansion differences between iron cores and coils, leading to moisture ingress and insulation failure, particularly at critical points where the protective layer is fixedly connected and exposed to mechanical stress.
Innovation Solution
Incorporating an elastic section of the protective layer made of silicone or similar materials in critical regions to compensate for thermal expansion and absorb mechanical stresses, replacing the traditional hard plastic layer with a multi-material encapsulation that is temperature-resistant and moisture-barrier effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a hard plastic protective layer is used to protect against corrosion and mechanical stress, then protection against environmental influences is improved, but the protective layer tears due to thermal expansion differences between iron core and coil
Solution Approach 1:
The protective layer transitions from a purely hard plastic material to a composite material system that includes an elastic section. This changes the physical parameters of the protective layer, allowing it to accommodate thermal expansion differences between the iron core and coil while maintaining protection against corrosion and mechanical stress.
Solution Approach 2:
The protective layer is designed as a composite structure with a hard plastic section for corrosion protection and an elastic section for accommodating thermal expansion. This composite approach combines the advantages of both material types to resolve the contradiction between protection and resistance to tearing.
2Stability of the object's composition
If the protective layer is fixedly connected to the coil in critical regions, then mechanical stability is improved, but cracks form due to strong mechanical stresses during cyclic operation
Solution Approach 1:
The elastic section of the protective layer acts as a flexible element that can deform under mechanical stress during cyclic operation. This flexibility prevents the formation of cracks while maintaining mechanical stability, as the elastic section can absorb and distribute the stresses that would otherwise concentrate at fixed connection points.
3Strength
If the protective layer is made inflexible to provide wear resistance, then wear resistance is improved, but the protective layer cannot accommodate thermal expansion and develops gaps
Solution Approach 1:
The protective layer is segmented into distinct functional sections: a hard plastic section for wear resistance and an elastic section for accommodating thermal expansion. This segmentation allows each section to perform its specific function optimally without compromising the overall integrity of the protective layer.
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 elastic section effectively prevents tears and cracks in the protective layer, enhancing environmental resistance and significantly increasing the service life of the magnet pole by maintaining a seal despite thermal expansion and mechanical stress.
Implementation Method 1
Due to the different thermal expansion coefficients of iron and the coil material, the result is that the coils expand further in the radial direction than do the iron cores
Implementation Method 2
The elastic section of the protective layer, which is provided in the critical regions, can compensate for the different thermal expansions resulting from the different expansion coefficients
Data Source
AI summary
A magnet pole for magnetic levitation vehicles includes an iron core (1) having an upper pole surface (2), a lower contact surface (3) for a magnet rear side (4) and a circumferential surface (5) disposed between the pole surface (2) and the contact surface (3). A coil (6) is applied onto the circumferential surface (5) of the iron core (1). An intermediate layer is made of an electrically insulating material, which is disposed between the circumferential surface (5) and the coil (6). A protective layer (9) encapsulates the coil (6). At least the pole surface (2) of the iron core (1) is made of a hard material and abuts the circumferential surface (5) in a lower region of the iron core (1). The protective layer (9) contains a section (15) made of an elastic material in a region adjacent to the circumferential surface (5).