Motor Device Positioning via Intermediary Protrusions
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Solution Overview
Problem
Existing motor devices face challenges in achieving high positioning accuracy between the circuit board and the case, which affects the detection accuracy of the motor's rotation angle due to cumulative dimensional tolerances, making it difficult to enhance detection precision.
Innovation Solution
The motor device incorporates a case with a base and cover, featuring through holes and protrusions for precise positioning of the circuit board and connectors, ensuring accurate alignment and opposition of the magnetoelectric conversion element to the sensor magnet, thereby enhancing the detection accuracy of the rotation angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnetoelectric conversion element is mounted on the printed circuit board to be opposed to the sensor magnet through a through hole in the base, then the rotation angle detection function is achieved, but the positioning accuracy requirement becomes excessively high due to cumulative dimensional tolerances
Solution Approach 1:
The patent introduces a positioning protrusion on the circuit board that fits into a positioning hole in the base as an intermediary positioning mechanism. This mediator structure directly establishes the spatial relationship between the circuit board and base, eliminating the need for high-precision positioning through the connector assembly path and reducing cumulative dimensional tolerances.
Solution Approach 2:
The patent extracts the positioning function from the connector assembly and implements it separately through dedicated positioning protrusions and holes. By separating the positioning function from the electrical connection function, the design allows the circuit board to be positioned accurately relative to the base without requiring the connector to maintain both functions simultaneously, thereby reducing positioning accuracy requirements.
2Manufacturing precision
If multiple through holes and positioning protrusions are added to the base and circuit board, then positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent segments the positioning function into two independent elements: a positioning protrusion on the circuit board and a corresponding positioning hole in the base. This segmentation allows each element to be optimized for its specific function without requiring complex integrated solutions, achieving accurate positioning with minimal structural additions.
Solution Approach 2:
The patent applies local quality by adding positioning features only at the specific locations where electrical connections are made. The positioning protrusions are placed at terminal positions on the circuit board, ensuring that positioning accuracy is provided exactly where needed without adding complexity to the entire device structure.
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
This configuration enables precise positioning of the external and internal connectors relative to the case, ensuring accurate detection of the motor's rotation angle, while also reducing the motor device's size and improving vibration-proof properties.
Implementation Method 1
The electronic components include a magnetoelectric conversion element, which is mounted on a surface opposed to the base. The magnetoelectric conversion element is mounted to be opposed to the sensor magnet through a through hole, which is formed in the base.
Data Source
AI summary
A case includes a base and a cover and defines an accommodation space therein. The base has a first through hole through which a magnetoelectric conversion element, which is mounted on a circuit board, is opposed to a sensor magnet of a motor. A connector includes a terminal and a housing, which supports the terminal. The connector has a first protrusion projected toward the base for positioning. The first protrusion of the connector has a tip end inserted through a second through hole of the printed circuit board and further inserted in a hole portion of the base. A second protrusion of the base is projected toward the printed circuit board and is inserted in a third through hole of the printed circuit board for positioning.