Sensor Magnet Holder Deflection Design
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Solution Overview
Problem
Existing sensor magnet holders for small motors are too large, which increases the length of the motor shaft and poses a risk of cracking the sensor magnet due to direct stress transmission during press fitting.
Innovation Solution
A sensor magnet holder design featuring a press fitting part, a holding part radially outside the press fitting part, and a joint part that deflects under external force, allowing for a thinner profile and stable magnet fixation without excessive force biasing, with joint parts extending radially and circumferentially to reduce axial length and prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor magnet holder uses a cylindrical part with axially projecting snap fits to fix the sensor magnet, then the sensor magnet is securely held without direct stress transmission, but the axial length of the holder becomes relatively long, increasing the motor shaft length required
Solution Approach 1:
The joint part extends primarily in the radial direction rather than the axial direction, changing the dimension in which the connection structure develops. This allows the snap fits to be positioned radially outward from the cylindrical part without requiring additional axial length, thereby reducing the holder's axial dimension while maintaining secure magnet fixation
Solution Approach 2:
The joint part is designed to be deflectable under external force, allowing it to flex during assembly and operation. This dynamic characteristic enables the joint part to accommodate stress and deformation without breaking, while its radial extension provides sufficient leverage for secure magnet holding without increasing axial length
2Device complexity
If the motor shaft is press fitted directly to the center of the sensor magnet, then the fixation is simple, but the stress from the motor shaft is directly transmitted to the sensor magnet, causing cracks
Solution Approach 1:
The holder acts as an intermediary component between the motor shaft and the sensor magnet. The cylindrical part receives the press-fitted motor shaft, while the snap fits extend radially to hold the magnet. The deflectable joint part serves as a flexible connector that isolates the magnet from direct stress transmission, preventing cracks while maintaining secure fixation
Solution Approach 2:
The holder is segmented into distinct functional parts: the cylindrical part for motor shaft reception, the joint part for connection, and the snap fits for magnet holding. This segmentation allows each part to be optimized for its specific function, with the joint part specifically designed to be deflectable to prevent stress transmission to the magnet
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 design reduces the size of the sensor magnet holder, minimizing the motor shaft length and preventing sensor magnet cracking by distributing stress effectively through the deflection of joint parts, ensuring stable and secure magnet fixation.
Implementation Method 1
The joint part is configured such that at least a part of the joint part is deflected by an external force
Data Source
AI summary
A sensor magnet holder is used to fix a sensor magnet to a motor shaft. The sensor magnet holder includes a press fitting part to which the motor shaft is press fitted; a holding part provided radially outside the press fitting part to hold the sensor magnet; and a joint part that joins the press fitting part and the holding part. The joint part is configured such that at least a part of the joint part is deflected by an external force.