Motor Sensor Substrate Retention for Precise, Easy Replacement
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Solution Overview
Problem
Existing motor designs require complex disassembly to replace the substrate with a rotation position detection circuit, especially in environments with charged dust, making the process cumbersome.
Innovation Solution
A motor design where the substrate with the rotation position detection circuit is fixed to a case rather than the stator, allowing for easy replacement by utilizing a restricting portion to maintain positional accuracy and a fixing portion for secure attachment, enabling quick retrofitting and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the substrate is fixed to the stator, then the positional relationship between the substrate and stator is constant, but the replacement work becomes complicated requiring motor disassembly
Solution Approach 1:
The substrate mounting structure is segmented into two independent parts: the stator with a restricting portion that provides positional reference, and the case with a fixing portion that enables secure attachment. This segmentation allows the substrate to be mounted on the case rather than directly on the stator, facilitating easy replacement by simply removing the case while maintaining precise positioning through the restricting portion.
2Stability of the object's composition
If the substrate is fixed to the stator, then the substrate position is stable, but the attachment position must be exposed requiring disassembly for replacement
Solution Approach 1:
The case acts as an intermediary component between the stator and the substrate. The restricting portion on the stator provides positional guidance, while the fixing portion on the case secures the substrate. This intermediary structure allows the substrate to be accessed and replaced by simply removing the case, eliminating the need to disassemble the stator while maintaining stable positioning.
Data Source
AI summary
A motor includes: a central shaft; a stator extending in an axial direction around the central shaft; a rotor facing an outer side in a radial direction of the stator and configured to rotate around the central shaft; a substrate located on one side in the axial direction with respect to the rotor and on which a rotation position detection circuit detecting a rotation position of the rotor is mounted; and a case located on one side in the axial direction with respect to the substrate and supporting the stator. The stator includes a restricting portion restricting a position in a circumferential direction of the substrate. The case includes a fixing portion fixing the substrate. The substrate includes a restricted portion whose position in the circumferential direction is restricted by the restricting portion, and a fixed portion fixed to the fixing portion.