Hollow Center Angular Position Sensor for Construction Machinery
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Solution Overview
Problem
Existing rotation sensors in construction machines are limited in angle measurements and are primarily designed for diesel-powered machines, failing to provide accurate and comprehensive angle measurement capabilities for a wide range of construction equipment.
Innovation Solution
A magnetic angle sensor system featuring a cylindrical magnet holder with a magnetic coding on its outer surface, supported by a sensor base with magnetic field sensors fixed on arc-segments that partially overlap, allowing for precise measurement of the rotation angle between the upper and lower bodies of a swivel joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional rotation sensors are used, then the sensor design is simple and suitable for diesel machines, but the angle measurement range is limited and not compatible with electrically powered machines
Solution Approach 1:
The sensor system uses a universal magnetic field detection principle that works for both diesel and electrically powered construction machines. The magnetic field sensors detect the magnetic coding on the rotating shaft, providing angle measurement functionality that is adaptable to different machine types and power systems without requiring machine-specific design modifications.
2Measurement precision
If traditional rotation sensors are used, then the device complexity is low, but the angle measurement accuracy and comprehensive range are insufficient
Solution Approach 1:
The sensor system divides the angle measurement function into multiple magnetic field sensors positioned at different locations. Each sensor detects the magnetic field at its specific position, and the combined signals from these segmented sensors enable comprehensive angle measurement across the full rotation range, improving accuracy without requiring a single overly complex sensor component.
Solution Approach 2:
The patent introduces a magnetic coding element as an intermediary between the rotating shaft and the magnetic field sensors. This magnetic coding serves as a mediator that carries angular position information and enables the sensors to accurately detect and measure the rotation angle, improving measurement precision while keeping the overall device structure relatively simple.
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 system enables accurate and comprehensive angle measurement across a full 360-degree range, compatible with both diesel and electrically powered construction machines, enhancing the operational precision and versatility of construction equipment.
Implementation Method 1
A magnetic coding is arranged on the outer surface of the magnet holding portion that establishes a magnetic field. A sensor base encircles the base portion of the magnet holder and supports magnetic field sensors that are fixed on an arc-segment.
Data Source
AI summary
An angular position sensor is disclosed. The angular position sensor has a cylindrical magnet holder that has a base portion attached to a top surface of a shaft and a magnet holding portion extending from the base portion. A magnetic coding is arranged on the outer surface of the magnet holding portion that establishes a magnetic field. A sensor base encircles the base portion of the magnet holder and supports magnetic field sensors that are fixed on an arc-segment. The arc-segments partially overlap so that output signals of the magnetic field sensors are indicative of the angular portion of the sensor base relative to the shaft.