Stator Assembly Positioning Portion for Sensor Precision
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Solution Overview
Problem
Conventional fan motors face challenges in accurately positioning sensors due to axial displacement issues, which affect the precision of motor rotation control and sensor placement within the stator assembly.
Innovation Solution
The stator assembly incorporates a positioning portion, such as a convex portion or support tool, adjacent to the circuit board and sensor, which suppresses axial displacement, ensuring high-accuracy positioning of the sensor and allowing for effective use of space for electronic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the circuit board and sensor are placed in the stator assembly without a positioning portion, then the space for electronic components can be maximized, but axial displacement occurs causing imprecise sensor positioning
Solution Approach 1:
A positioning portion is introduced as an intermediary element between the circuit board and the stator assembly. This positioning portion acts as a mediator that prevents axial displacement of the circuit board, thereby ensuring precise sensor positioning without requiring complex structural modifications to the entire stator assembly.
Solution Approach 2:
The positioning portion is designed to automatically maintain the circuit board in its correct position through its own structural features. The positioning portion includes a positioning protrusion that fits into a corresponding positioning groove, creating a self-aligning and self-retaining mechanism that eliminates the need for additional active positioning systems.
2Measurement precision
If a positioning portion is added to suppress axial displacement, then sensor positioning precision is improved, but the stator assembly structure becomes more complex
Solution Approach 1:
The positioning function is segmented from the main stator assembly structure. The positioning portion is designed as a separate, modular component that can be independently manufactured and then integrated into the stator assembly. This segmentation allows for simplified manufacturing and assembly while achieving precise positioning.
Solution Approach 2:
Instead of making the entire stator assembly complex, the positioning portion applies local quality enhancement only where needed. The positioning protrusion and groove are located specifically at the circuit board mounting area, providing precise positioning only at the critical sensor location without adding unnecessary complexity to other parts of the assembly.
3Ease of manufacture
If the circuit board is allowed to displace axially, then the stator assembly structure can be simpler, but motor rotation control precision deteriorates
Solution Approach 1:
The positioning portion is designed to pre-establish the correct position of the circuit board before the assembly is put into operation. The positioning protrusion and groove create a predetermined, fixed relationship between the circuit board and stator assembly, ensuring that the sensor is always in the correct position relative to the rotor, thereby guaranteeing reliable motor control.
Data Source
AI summary
A stator assembly includes a stator that opposes a rotor, which rotates about a central axis extending vertically, in a radial direction, a cover that accommodates an axially upper portion of the stator, a base portion that covers at least an axially lower side of the stator, and a circuit board that opposes the base portion in an axial direction and includes a sensor. At least one of the cover and the base portion includes a positioning portion, which is adjacent to the circuit board in the axial direction, the positioning portion being adjacent to the sensor.