Motor Sensor Positioning via Self-Aligning Substrate
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Solution Overview
Problem
Existing motors face challenges in positioning sensors accurately, which affects detection accuracy and motor performance.
Innovation Solution
A motor design that includes a substrate with a sensor, where the substrate is positioned using a contact portion and a contacted portion with projecting portions, and a resin member with protruding parts, allowing for precise alignment and attachment to the stator, enabling the sensor to be placed at a desired position for optimal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the substrate is positioned using conventional methods, then the sensor position is fixed, but the detection accuracy is insufficient
Solution Approach 1:
The substrate's outer peripheral portion self-positions by contacting the frame's inner peripheral portion through projecting portions, enabling automatic alignment without additional positioning mechanisms. This self-positioning ensures the sensor achieves accurate detection position through the substrate's own structural features.
Solution Approach 2:
The positioning function is merged into the substrate and frame structures themselves through the contact portion and contacted portion with projecting portions. Instead of separate positioning mechanisms, the positioning capability is integrated into the mounting structure, ensuring both mechanical support and precise sensor positioning.
2Measurement precision
If the sensor is positioned at a desired location, then detection accuracy improves, but the substrate positioning becomes more complex
Solution Approach 1:
The frame and substrate have different local properties: the frame's inner peripheral portion has contacting surfaces with projecting portions, while the substrate's outer peripheral portion has corresponding contact portions. This local differentiation enables precise positioning at the interface without complicating the overall structure.
Solution Approach 2:
The contact portion and contacted portion are asymmetrically designed with projecting portions that fit together in a specific orientation. This asymmetric design ensures the substrate can only be mounted in the correct position, automatically achieving accurate sensor alignment without complex positioning mechanisms.
Data Source
AI summary
There is provided a motor having a sensor disposable at a desired position. The motor comprises a frame (11), a rotor, a stator, a substrate (40) provided in the stator, and a sensor (53) provided at the substrate (40). The substrate (40) includes a surface facing the rotor, and an outer peripheral portion (41). In the outer peripheral portion (41) of the substrate (40), a contact portion (49) contacting an inner peripheral portion (11a) of the frame (11) is provided. In the inner peripheral portion (11a) of the frame (11), contacted portions (11j), (11k) contacting the outer peripheral portion (41) of the substrate (40) are provided. In at least one of the contact portion (49) and the contacted portion (11j), (11k), a projecting portion (49j), (49k) projecting toward another of the contact portion and the contacted portion is provided.