Electrically Operated Valve Angle Sensing With Magnetic Flux Yoke
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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 with a yoke to enhance magnetic flux detection, including a first yoke covering the permanent magnet and a second yoke covering the angle sensor, to improve detection accuracy and reduce noise from external magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic sensors are disposed in the radially outer direction of the rotating body to detect rotation angle, then detection can be performed, but a large number of sensors are required which increases cost and device complexity
Solution Approach 1:
A magnetic flux concentrating structure (yoke with magnetic flux concentration portion) is introduced as an intermediary between the permanent magnet and the angle sensor. This structure concentrates and guides the magnetic flux from the permanent magnet to the angle sensor, enabling accurate rotation angle detection with a single sensor instead of multiple sensors arranged radially.
Solution Approach 2:
The magnetic flux distribution parameters are changed by introducing the yoke structure with specific geometric parameters (thickness, width, and positioning). This modifies the magnetic field parameters to concentrate flux in a specific direction, allowing the angle sensor to detect rotation angle accurately without requiring multiple sensors.
2Measurement precision
If multiple magnetic sensors are disposed radially outward to improve detection accuracy, then rotation angle can be detected more accurately, but the support mechanism becomes complicated and space requirements increase
Solution Approach 1:
The yoke structure integrates multiple functions: it serves as a magnetic flux concentrator, a structural support, and a space-saving mounting platform. By merging these functions into a single component, the support mechanism complexity is reduced while maintaining accurate rotation angle detection capability.
Solution Approach 2:
The yoke structure performs multiple functions simultaneously: concentrating magnetic flux, providing mechanical support for the angle sensor, and defining the spatial arrangement. This multi-functionality eliminates the need for separate support mechanisms for each sensor, simplifying the overall structure.
3Measurement precision
If magnetic sensors detect rotation angle by increasing or decreasing Hall current, then rotation angle can be detected, but rotation angle information is lost when power is turned off
Solution Approach 1:
A permanent magnet is pre-positioned on the rotation shaft to continuously generate a magnetic field that reflects the current rotation angle. This preliminary arrangement ensures that the magnetic field configuration is always present and corresponds to the actual rotation angle, even when power is off. When power is restored, the angle sensor can immediately detect the rotation angle without loss of 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
The design allows for more accurate detection of the valve body position by enhancing the detection of the rotation angle with reduced noise interference, maintaining accuracy even when power is cycled.
Implementation Method 1
a permanent magnet member (70) disposed on a rotation shaft (50) and configured to rotate with the rotation shaft (50)
Implementation Method 2
an angle sensor (80) disposed above a permanent magnet (72) included in the permanent magnet member (70) and configured to detect a rotation angle of the permanent magnet (72)
Implementation Method 3
a yoke (9) configured to cover a portion of the permanent magnet (72) or a portion of the angle sensor (80)
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, an angle sensor, and a yoke configured to cover a portion of the permanent magnet or a portion of the 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.