Electric Valve Rotor Restriction Detection Using Dual Hall Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric valve control systems require complex processes to detect when the rotor reaches a reference position, making it difficult to simply determine if the rotation of the magnet rotor is restricted.
Innovation Solution
The electric valve control device uses a configuration with a magnet rotor and two magnetic sensors positioned outside the can, where the output signals of the sensors and expected value information are used to detect the restriction of the magnet rotor's rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single Hall IC is used to detect rotor position, then the detection function is achieved, but the control process becomes complex requiring flags and counting mechanisms
Solution Approach 1:
The patent transitions from single-dimension detection (one Hall IC) to two-dimension detection (two Hall ICs positioned at different angular locations). This dimensional expansion allows simultaneous detection of rotor position and rotation restriction status, eliminating the need for complex flag-based control processes while maintaining detection accuracy.
Solution Approach 2:
The dual Hall IC configuration enables the system to self-diagnose rotation restriction by comparing expected signal patterns with actual readings. The system automatically detects abnormal states without requiring external intervention or complex control logic, making the detection process simpler and more autonomous.
2Reliability
If multiple detection mechanisms are implemented to accurately detect rotor restriction, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The detection function is segmented into two independent Hall ICs positioned at different angular locations around the rotor. Each sensor independently monitors magnetic field changes, and their combined signals provide reliable detection of rotation restriction. This segmentation distributes the detection function across multiple simple components rather than requiring a single complex mechanism.
Solution Approach 2:
The system implements feedback by continuously monitoring the output signals from both Hall ICs and comparing them against expected patterns during normal rotation. When the rotor encounters restriction, the feedback mechanism detects the abnormal signal pattern, enabling reliable identification of the restricted state without additional complex hardware.
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 configuration allows for a simple detection of the rotor's restricted rotation by comparing the output signals with expected values, thereby simplifying the detection process.
Implementation Method 1
The Hall IC is disposed outside the case. An output signal of the Hall IC is a signal (a binary signal) corresponding to the magnetic field generated by the detection magnet drum.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
[Object] To provide an electric valve control device and an electric valve device that are capable of detecting in a relatively simple way that rotation of a magnet rotor is restricted. [Solution] An electric valve control device controls an electric valve. The electric valve includes a first magnetic sensor (91) and a second magnetic sensor (92). Output signals of the first magnetic sensor (91) and the second magnetic sensor (92) are each a binary signal. Where n represents the total number of north poles and south poles of a magnet rotor (31), N represents a natural number, and θ represents an angle between a line (M1) connecting an axis (L) to the first magnetic sensor (91) and a line (M2) connecting the axis (L) to the second magnetic sensor (92), the following expression (1) is satisfied. θ=360/n×N+360/2n The electric valve control device is configured to detect that the rotation of the magnet rotor (31) is restricted using the output signals and output-signal expected value information.