Electric Valve Sensor PCB Layout for Compact Angle Detection
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Solution Overview
Problem
The existing electric valve design is bulky due to the circuit board's location above the can, making it difficult to position the magnetic sensor near the can without obstructing the stator.
Innovation Solution
The electric valve is redesigned with a sub circuit board located adjacent to the inner space of the stator unit, allowing the magnetic sensor to be positioned closer to the can while sharing electronic components with the main circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the circuit board is located above the can, then the magnetic sensor can be positioned near the can, but the electric valve has a large shape in plan view and a large height dimension
Solution Approach 1:
The circuit board is repositioned from a vertical arrangement (above the can) to a lateral arrangement (adjacent to the can in the radial direction). This dimensional change allows the magnetic sensor to be positioned near the can while reducing both the plan view size and height dimension of the electric valve, as the circuit board no longer extends vertically above the can but instead occupies space in the radial direction where it does not increase the overall envelope dimensions.
Solution Approach 2:
The circuit board is divided into a main circuit board and a sub circuit board. The main circuit board is positioned laterally adjacent to the can, while the sub circuit board extends toward the magnetic sensor position. This segmentation allows the magnetic sensor to be placed near the can for accurate rotational angle detection, while the distributed circuit board arrangement optimizes space utilization and reduces the overall valve size.
2Volume of moving object
If the circuit board is located laterally adjacent to the can, then the height dimension is reduced, but it is difficult to locate the magnetic sensor near the can due to the stator between the circuit board and the can
Solution Approach 1:
The circuit board is segmented into a main circuit board and a sub circuit board positioned at different radial locations. The sub circuit board is specifically positioned between the main circuit board and the can, allowing the magnetic sensor to be mounted on the sub circuit board near the can. This segmentation enables the magnetic sensor to achieve accurate rotational angle detection despite the presence of the stator, while the main circuit board remains laterally adjacent to maintain a reduced height dimension.
Solution Approach 2:
The sub circuit board acts as an intermediary element between the main circuit board and the can. It provides a mounting surface for the magnetic sensor close to the can while being electrically connected to the main circuit board. This intermediary structure allows the magnetic sensor to overcome the obstruction caused by the stator and achieve accurate detection, without compromising the compact height dimension achieved by the lateral circuit board arrangement.
3Measurement precision
If the magnetic sensor is positioned near the can, then accurate rotational angle detection is achieved, but the circuit board requires more space
Solution Approach 1:
The circuit board functionality is divided between a main circuit board and a sub circuit board. The sub circuit board, which has a smaller area, is positioned near the can to mount the magnetic sensor for accurate rotational angle detection. The main circuit board, which handles other control functions, is positioned laterally adjacent to the can. This segmentation allows the magnetic sensor to be near the can without requiring the entire circuit board to occupy large space, thus achieving accurate detection with minimized circuit board area.
Solution Approach 2:
Different regions of the circuit board system are assigned different functions and sizes. The sub circuit board near the can is designed with minimal area sufficient only for mounting the magnetic sensor and its immediate connections, while the main circuit board farther from the can handles the bulk of control functions. This local quality differentiation allows the magnetic sensor to be positioned near the can for accurate detection without requiring excessive circuit board area overall.
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 a more compact electric valve design by allowing the magnetic sensor to be closer to the can, reducing the overall size of the valve while maintaining accurate rotational angle detection.
Implementation Method 1
a magnetic sensor that is mounted on the sub circuit board... The magnetic sensor is located closer to the inner space than the circuit board terminal is
Data Source
AI summary
A stator unit includes a main circuit board parallel to an up-and-down direction, a sub circuit board at a right angle to the main circuit board, a magnetic sensor on the sub circuit board, and a housing including a sub circuit board space that is located adjacent to an inner space of the stator unit in which a can is disposed. The sub circuit board includes a first end connected to the main circuit board via a circuit board terminal and a second end located near the inner space in the sub circuit board space. The magnetic sensor is located closer to the inner space than the circuit board terminal is.