Axial Magnet Sensing in Electric Valves for Precise Position Detection
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Solution Overview
Problem
Existing electrically operated valves face challenges in accurately detecting the rotation angle of a rotating body using magnetic sensors disposed radially outward, requiring multiple sensors which increase cost and complexity, and lose rotation angle information when power is turned off.
Innovation Solution
An electrically operated valve design incorporating a permanent magnet member and an angle sensor disposed above it, with the angle sensor detecting the rotation angle of the permanent magnet, supported by a control substrate and housed in a case with a partition member to maintain distance and prevent vibration, allowing for accurate position detection of the valve body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If magnetic sensors are disposed radially outward to detect rotation angle, then detection method is simple, but detection accuracy decreases and device complexity increases
Solution Approach 1:
The patent transitions from radial arrangement (2D plane) to axial arrangement (3D space), placing the angle sensor above the permanent magnet along the rotation axis. This dimensional change enables accurate detection of rotation angle while maintaining simple manufacturing, as the axial position eliminates the need for precise radial alignment and reduces the number of sensors required.
2Measurement precision
If multiple magnetic sensors are disposed radially outward to improve detection accuracy, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent extracts the angle sensor from the radial plane and positions it axially above the permanent magnet. This extraction eliminates the need for multiple sensors arranged radially, reducing device complexity while maintaining detection accuracy through the axial magnetic field measurement approach.
3Ease of operation
If magnetic sensors detect rotation angle through Hall current changes, then detection is possible, but rotation angle information is lost when power is turned off
Solution Approach 1:
The system uses the permanent magnet's inherent magnetic field, which exists independently of power supply, to provide rotation angle information. The angle sensor detects the magnetic field orientation directly, enabling the system to self-determine its position even during power cycling, thus preventing information loss.
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 design enables more accurate detection of the valve body position by maintaining a constant distance between the permanent magnet and the angle sensor, reducing complexity and cost, and ensuring continuous rotation angle measurement even when power is cycled.
Implementation Method 1
a permanent magnet member disposed on the rotation shaft and configured to rotate with the rotation shaft
Implementation Method 2
an angle sensor configured to detect a rotation angle of a permanent magnet included in the permanent magnet member
Data Source
AI summary
An object of the present invention is to provide an electrically operated valve capable of more accurately detecting the position of a valve body. In order to achieve the above object, the electrically operated valve of the present invention comprises a valve body, a driver configured to move the valve body along a first axis, a rotation shaft configured to rotate the driver around the first axis, a permanent magnet member, and an angle sensor. The permanent magnet member is disposed on the rotation shaft and configured to rotate with the rotation shaft. The angle sensor is configured to detect a rotation angle of a permanent magnet included in the permanent magnet member. The angle sensor is disposed above the permanent magnet.