Motor Position Sensor Substrate Mounting for Easier Replacement
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Solution Overview
Problem
Existing motors require complex disassembly procedures to replace substrates, especially in dusty environments, due to the fixed attachment of rotation position detection circuits to the stator, complicating maintenance and replacement processes.
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 removal and replacement by locating the fixing portions on the outer side of the rotor, enabling simpler retrofitting and maintenance.
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 is separated from the stator and repositioned on the rotor assembly. Specifically, the substrate is mounted on the rotor plate or rotor magnet, which can be independently removed from the stator assembly. This segmentation allows the substrate to be accessed and replaced without disassembling the entire motor, while still maintaining accurate positioning through the rotor's structured mounting surfaces.
2Stability of the object's composition
If the substrate is fixed to the stator, then the structure is stable, but the replacement process requires complex disassembly
Solution Approach 1:
The substrate is extracted from the stator assembly and relocated to the rotor assembly. The rotor plate or rotor magnet serves as a separate mounting platform that can be easily detached from the stator, allowing the substrate to be accessed, removed, and replaced without complex disassembly of the stator housing or internal components.
3Strength
If the fixing portions are located on the inner side of the rotor, then the substrate is securely fixed, but the substrate replacement becomes difficult
Solution Approach 1:
Instead of fixing the substrate from the inner side of the rotor toward the center, the substrate is fixed from the outer side of the rotor assembly. The rotor plate or rotor magnet provides an outer mounting surface that allows access to the substrate from the exterior of the motor, enabling easy removal and replacement while maintaining secure fixation through the rotor's structural features.
Data Source
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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.