Electric Valve Position Sensing With Axial Magnet-Sensor Layout
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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 outer to the rotating body, leading to increased costs and complexity, and loss of rotation angle information when power is turned off.
Innovation Solution
An electrically operated valve design incorporating a permanent magnet member with an angle sensor disposed above it, supported by a control substrate, and a case with a partition member to maintain a constant distance, allowing for accurate detection of the rotation angle and position of the valve body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic sensors are disposed radially outer to the rotating body for detecting rotation angle, then detection capability is provided, but the number of sensors must be large which increases cost and device complexity
Solution Approach 1:
The invention changes the spatial arrangement of the magnetic sensor from a radial configuration (requiring multiple sensors) to an axial configuration (requiring only one sensor). The angle sensor is disposed above the permanent magnet member along the rotation axis, detecting the rotation angle through axial magnetic field interaction rather than radial sensing, thereby reducing the number of sensors needed while maintaining detection accuracy
Solution Approach 2:
The invention uses a single angle sensor to detect the rotation angle by measuring the position of the permanent magnet member along the rotation axis. This single sensor effectively replaces what would traditionally require multiple radial sensors, simplifying the detection system while maintaining the capability to determine rotational position
2Measurement precision
If multiple magnetic sensors are disposed radially to improve detection accuracy, then measurement precision improves, but manufacturing cost increases
Solution Approach 1:
The invention transitions from a radial sensor arrangement (requiring multiple expensive sensors) to an axial sensor arrangement (requiring one sensor). By positioning the angle sensor above the permanent magnet member and utilizing axial magnetic field detection, the system achieves the same measurement precision with fewer components, thereby reducing manufacturing cost
Solution Approach 2:
A single angle sensor positioned axially above the permanent magnet member performs the detection function that would otherwise require multiple radial sensors. This single sensor approach reduces component count and manufacturing cost while maintaining the necessary detection accuracy for rotation angle measurement
3Reliability
If radial magnetic sensor arrangement is used, then detection structure is established, but sufficient space must be secured and support mechanism becomes complicated
Solution Approach 1:
The invention repositions the angle sensor from a radial arrangement (requiring complex support structures to hold multiple sensors around the rotor) to an axial arrangement (positioned above the permanent magnet member). This dimensional change simplifies the support mechanism, as the single angle sensor can be mounted on the stator or housing structure without requiring complex radial positioning arrangements
4Measurement precision
If Hall current-based rotation angle detection is used, then rotation angle can be detected, but absolute rotation angle information is lost when power is turned off
Solution Approach 1:
The angle sensor system uses the permanent magnet member's inherent magnetic field to provide absolute position information. The permanent magnet member rotates with the rotor and its magnetic field position relative to the angle sensor directly indicates the absolute rotation angle, eliminating the need for external power or reference signals to maintain position information
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 and rotation angle, reducing complexity and cost while maintaining accurate angle information even when power is cycled.
Implementation Method 1
a permanent magnet member (70) disposed on the rotation shaft (50) and configured to rotate with the rotation shaft (50)
Implementation Method 2
an angle sensor configured to detect a rotation angle of a permanent magnet included in the permanent magnet member (70)
Data Source
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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. [Resolution Means] 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.