Motor Sensor Magnet Mounting Recess to Reduce Leakage
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Solution Overview
Problem
The existing motor assembling structure experiences wear-out issues at the contact points between the rotation shaft and the sensor magnet, leading to a gap formation, reduced precision in detection, and magnetism leakage, which affects the motor's durability and detection accuracy.
Innovation Solution
A recessed portion with a notch is formed on the rotation shaft to securely mount the sensor magnet, reducing wear-out and magnetism leakage, while maintaining a reduced height to minimize material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor magnet is mounted directly on the rotation shaft with a round contact interface, then the assembly is simple and easy to manufacture, but the contact surface wears out over time causing gaps and reduced detection precision
Solution Approach 1:
The patent applies local quality by creating a recessed portion with a flat bottom surface at the specific location where the sensor magnet mounts on the rotation shaft. This localized structural modification provides a wear-resistant mounting surface without complicating the overall shaft design, thereby improving detection precision while maintaining manufacturing simplicity.
2Stability of the object's composition
If the contact area between the sensor magnet and rotation shaft is increased to improve mounting stability, then the sensor magnet is more securely fixed, but magnetism leaks and material costs increase
Solution Approach 1:
The patent introduces a magnetic shielding film (thin film) at the contact interface between the sensor magnet and the rotation shaft's flat surface. This thin film provides stable mechanical mounting while preventing magnetic flux leakage, thus achieving both mounting stability and reduced magnetism loss without increasing contact area.
3Duration of action of stationary object
If wear-resistant materials or coatings are applied to the contact surface to prevent wear-out, then the durability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent implements preliminary action by pre-forming a recessed portion with a flat bottom surface during the rotation shaft manufacturing process. This design incorporates the wear-resistant mounting surface into the base manufacturing step, eliminating the need for additional wear-resistant coatings or treatments, thus improving durability while maintaining ease of manufacture.
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 design enhances the durability of the rotation shaft, improves detection precision, and reduces material costs by minimizing the contact area and magnetism leakage between the sensor magnet and the rotation shaft.
Implementation Method 1
The sensor magnet 121 emits flux or polarity according to rotation of the rotation shaft 10 and the rotor 11
Data Source
AI summary
A motor includes a rotation shaft having a first recessed portion. The first recess portion includes a bottom surface and a wall surface and a second recessed portion formed in the bottom surface. A rotor having a first magnet surrounds the rotation shaft and rotates together with the rotation shaft. A detector includes a second magnet mounted in the first recessed portion and detects rotation of the rotor.