Superconducting Motor Bobbin With CFRP Reinforcement for Coil Stability
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Solution Overview
Problem
Existing bobbins for superconducting motors face challenges in achieving both cooling performance and structural stability, particularly under strong magnetic fields, which can lead to displacement and damage of the superconducting coil.
Innovation Solution
A bobbin design featuring a reinforcement made of carbon fiber reinforced plastic (CFRP) surrounding the side surface of the bobbin body, which supports the superconducting coil and enhances structural stability while maintaining a minimal thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the bobbin thickness is reduced to minimize size, then the cooling performance and weight are improved, but the structural stability deteriorates causing coil displacement under strong magnetic fields
Solution Approach 1:
The patent applies composite materials by combining aluminum (or aluminum alloy) for the bobbin body with carbon fiber reinforced plastic (CFRP) for the reinforcement. The aluminum provides excellent thermal conductivity for cooling performance, while the CFRP provides high strength-to-weight ratio for structural stability. This composite structure enables the bobbin to maintain thin dimensions while withstanding strong magnetic field forces without coil displacement.
Solution Approach 2:
The bobbin is segmented into distinct functional components: the aluminum bobbin body (core and cover) responsible for thermal management and basic structural support, and the CFRP reinforcement layer responsible for providing additional mechanical strength. This segmentation allows each material to optimize its specific function while working together to solve the overall contradiction between thinness and stability.
2Weight of moving object
If the bobbin thickness is reduced to minimize size, then the weight is reduced, but the strength deteriorates leading to potential damage under magnetic field forces
Solution Approach 1:
The combination of aluminum and CFRP creates a composite structure where the aluminum provides lightweight properties and thermal conductivity, while the CFRP contributes high strength and stiffness. This composite approach achieves weight reduction compared to solid steel structures while maintaining sufficient strength to withstand magnetic field forces through the synergistic properties of the two materials.
Solution Approach 2:
The CFRP reinforcement is applied locally on the outer surface of the aluminum bobbin body, providing strength enhancement only where needed to resist magnetic field forces. This localized reinforcement maintains the overall lightweight characteristic of the aluminum structure while adding strength precisely where the mechanical stress occurs during motor operation.
3Stability of the object's composition
If a reinforcement structure is added to enhance structural stability, then the coil displacement is reduced, but the device complexity increases
Solution Approach 1:
The bobbin structure is divided into two main segments: the aluminum bobbin body and the CFRP reinforcement layer. This segmentation allows for simplified manufacturing of each component separately (casting or machining the aluminum body, then applying the CFRP layer), reducing overall device complexity compared to attempting to create a monolithic structure with integrated reinforcement features.
Solution Approach 2:
By using composite materials with complementary properties, the design achieves structural stability without requiring complex geometric features or additional support elements. The CFRP layer itself provides the necessary reinforcement through its material properties, simplifying the overall structural design compared to using traditional materials that would require thicker sections or additional bracing.
Data Source
AI summary
Proposed is a bobbin for a superconducting motor by which cooling performance can be obtained and structural stability can be expected. The bobbin for a motor includes a bobbin body on which a superconducting coil is wound and a reinforcement including a reinforced plastic including reinforcing fiber and surrounding a side surface of the bobbin body.