Electrically Operated Valve Position Sensing With Fixed Magnet Gap
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrically operated valves face challenges in accurately detecting the angle of rotation of a rotating body using magnetic sensors arranged radially outward, leading to increased costs, complex support mechanisms, and loss of rotational information when power is turned off.
Innovation Solution
An electrically operated valve design featuring a rotor member, stator member, permanent magnet member, and angle sensor, where the guide member guides the relative movement of the rotor member with respect to the permanent magnet member, maintaining a fixed distance between the magnet and sensor, allowing continuous detection of the angle of rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If magnetic sensors are arranged radially outward from the rotating body to detect angle of rotation, then the detection mechanism is simplified, but measurement precision deteriorates when multiple sensors are not used
Solution Approach 1:
The patent replaces the conventional radial magnetic sensor arrangement with a Hall effect sensor that detects changes in magnetic field strength along the axial direction. This substitution eliminates the need for multiple radial sensors while achieving precise angle detection through the relationship between magnetic field changes and rotor position.
Solution Approach 2:
The invention changes the detection parameter from radial magnetic field position to axial magnetic field strength variation. By detecting how the magnetic field strength changes along the axial direction as the rotor turns, the system achieves precise angle measurement without requiring multiple radial sensors.
2Measurement precision
If multiple magnetic sensors are arranged radially outward to improve angle detection precision, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent replaces multiple radial magnetic sensors with a single Hall effect sensor positioned axially. This substitution dramatically reduces the number of sensors required while maintaining or improving detection precision through the unique axial magnetic field detection method.
Solution Approach 2:
The invention extracts only the essential detection function by using a single Hall sensor that detects axial magnetic field changes. This eliminates the need for multiple radial sensors and their complex support structures, achieving the same measurement precision with fewer components.
3Device complexity
If magnetic sensors detect angle of rotation based on Hall current variations, then the detection mechanism is simple, but information is lost when power is turned off
Solution Approach 1:
The patent replaces conventional Hall current-based angle detection with a permanent magnet and Hall effect sensor system that detects axial magnetic field strength. This substitution enables absolute position detection that retains information through power cycles, as the magnetic field configuration directly reflects the rotor's absolute angular position.
Solution Approach 2:
The permanent magnet provides a continuous magnetic field that serves as its own reference, eliminating the need for external power or reset mechanisms. The Hall sensor detects the magnetic field configuration directly, providing absolute position information that persists without 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 enables more accurate detection of the valve body position by ensuring precise calculation of the valve opening degree, reducing costs and complexity, and maintaining accurate angle detection even when power is cycled.
Implementation Method 1
a permanent magnet member (70) which turns together with the rotor member (64)
Implementation Method 2
an angle sensor (80) which is arranged above the permanent magnet (72) included in the permanent magnet member (70) and detects an angle of rotation of the permanent magnet (72)
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The invention provides an electrically operated valve which can more accurately detect a position of a valve body. An electrically operated valve is provided with a valve shaft, a valve body, a rotor member which is movable together with the valve shaft in a parallel direction to a first direction, a stator member which applies a turning force to the rotor member, a permanent magnet member which turns together with the rotor member, an angle sensor which detects an angle of rotation of the permanent magnet, and a guide member which guides a relative movement of the rotor member or the valve shaft in relation to the permanent magnet member. A distance between the permanent magnet and the angle sensor is fixed when the permanent magnet member turns.