Rotor Magnet Retention Using Elastic Protective Winding
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Solution Overview
Problem
Existing rotor designs face issues with the fixation of fiber bundles around magnets, leading to unsatisfactory tension and potential misalignment, which can result in the fiber bundle pressing the magnet instead of securely holding it.
Innovation Solution
A rotor design featuring a ring-shaped rotor core with a rotor magnet fixed to its radially outer face, surrounded by a protective member wound circumferentially to press the magnet from the outside, utilizing a thread-shaped protective member with elasticity and a loop-shaped end that is hung on a protrusion of the magnet for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fiber bundle is wound around a magnet while applying tension, then the magnet can be held securely, but the fixation with adhesive becomes unsatisfactory in strength and the fiber bundle may press the magnet unfavorably
Solution Approach 1:
A protective member made of flexible resin material is introduced as an intermediary between the fiber bundle and the magnet. This protective member receives the tension from the fiber bundle and distributes it uniformly, preventing direct pressing of the magnet while providing a suitable surface for adhesive fixation. The protective member thus mediates between the mechanical tension requirement and the adhesive bonding requirement.
Solution Approach 2:
The protective member is formed from a flexible resin that combines elasticity with adhesive receptivity. This composite material property allows the protective member to both withstand the tension applied by the fiber bundle and provide a surface suitable for strong adhesive fixation, resolving the contradiction between mechanical strength and bonding quality.
2Reliability
If the protective member is made elastic to accommodate magnet shape, then fixation stability improves, but the structure becomes more complex
Solution Approach 1:
The protective member's elasticity is achieved by selecting appropriate resin material parameters rather than through complex structural design. By changing the material parameters (flexibility, elastic modulus) of the resin, the protective member can accommodate various magnet shapes and provide stable fixation without requiring additional structural complexity.
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 configuration ensures stable and secure fixation of the rotor magnet, preventing misalignment and reducing the risk of eddy current losses, while also reducing the parts count and improving detection accuracy for rotation sensors.
Implementation Method 1
a thread-shaped protective member 25 with elasticity
Data Source
AI summary
An aspect of the present invention provides a rotor rotatable about a central axis, the rotor including: a rotor core having a ring shape; a rotor magnet fixed to a radially outer face of the rotor core; and a protective member circumferentially wound around the rotor magnet to press the rotor magnet from radially outward of the rotor magnet. The rotor magnet includes a hanging portion on which a first end of the protective member is hung circumferentially.