Electric Valve Angle Sensing with Yoke-Shielded Permanent Magnet
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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 increases cost and complexity, and loses rotation angle information when power is turned off.
Innovation Solution
An electrically operated valve design featuring a permanent magnet member with a yoke covering the magnet and angle sensor, ensuring accurate detection of the rotation angle by concentrating magnetic flux and reducing noise from external sources, with a yoke configuration that shields the sensor from unwanted magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple magnetic sensors are disposed in the radially outer direction of the rotating body to detect rotation angle, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
A yoke is introduced as an intermediary component between the rotating body and the magnetic sensor. The yoke concentrates and guides magnetic flux from the rotating body to the sensor, enabling accurate rotation angle detection with a single sensor instead of multiple sensors arranged radially.
Solution Approach 2:
The magnetic flux distribution is changed by introducing the yoke, which concentrates and directs the magnetic field lines toward the sensor. This parameter change in magnetic flux concentration allows the sensor to detect rotation angle accurately without requiring multiple sensors.
2Measurement precision
If multiple magnetic sensors are disposed in the radially outer direction to detect rotation angle, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The yoke serves as a cost-effective intermediary that enables accurate rotation detection using a single magnetic sensor, thereby reducing the overall manufacturing cost compared to using multiple expensive sensors.
Solution Approach 2:
Instead of using multiple physical sensors to detect different angular positions, the yoke creates a concentrated magnetic flux pattern that allows a single sensor to effectively 'copy' the information that would otherwise require multiple sensors.
3Measurement precision
If a large number of magnetic sensors are disposed radially outward to detect rotation angle, then measurement precision is improved, but the support mechanism becomes complicated
Solution Approach 1:
The yoke acts as a support mechanism intermediary that simplifies the structure by providing a single mounting location for the magnetic sensor, eliminating the need for complex support structures required to hold multiple radially arranged sensors.
4Ease of operation
If magnetic sensors detect rotation angle by increasing or decreasing Hall current, then ease of operation is improved, but loss of information occurs when power is turned off
Solution Approach 1:
The patent replaces the electrical Hall current-based detection with a magnetic flux-based detection system using a yoke. This substitution allows the system to retain magnetic field information even when power is off, as the permanent magnet's field persists without requiring electrical power.
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 enhances the accuracy of rotation angle detection, reduces noise interference, and maintains accurate position sensing of the valve body even when power is cycled.
Implementation Method 1
a permanent magnet member (70) that includes a permanent magnet (72), the angle sensor (80) detects a rotation angle of the permanent magnet (72)
Implementation Method 2
a yoke (9) configured to cover a portion of the permanent magnet member (70) or a portion of the angle sensor (80)... concentrating magnetic flux
Implementation Method 3
the angle sensor (80) detects a rotation angle of the permanent magnet (72)... detecting the rotation angle of the rotating body
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. 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.