Rotation Angle Torque Sensor Magnetic Guide Interference
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Solution Overview
Problem
Existing rotation-angle and torque sensors face challenges with reciprocal screening of magnets, material costs, and miniaturization, leading to interference and increased costs.
Innovation Solution
A rotation-angle and torque sensor design using two shaft sections with a torsion rod, featuring two magnets, three magnetic sensors, and a configuration of circular-segment-shaped magnetic guides and magnetic flux guides to reduce interference and costs, while maintaining sensitivity and resolving power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If five gears, three magnets and three magnetic sensors are used as in the known sensor, then torque and rotation angle can be measured simultaneously, but the magnets cause reciprocal screening interference and material costs increase
Solution Approach 1:
The patent removes one magnet from the traditional five-gear configuration, reducing the number of magnetic sources from three to two. This extraction eliminates the reciprocal screening interference between adjacent magnets while maintaining the ability to measure both torque and rotation angle through the modified gear-magnet-sensor arrangement.
Solution Approach 2:
The patent introduces magnetic shields as intermediary elements between the magnets and magnetic sensors. These shields prevent direct magnetic coupling between adjacent magnets and sensors, eliminating the reciprocal screening effect while allowing the measurement function to continue through the modified gear train configuration.
2Reliability
If five gears, three magnets and three magnetic sensors are used, then torque and rotation angle can be measured, but the device complexity and material costs increase
Solution Approach 1:
The patent extracts and removes one magnet from the traditional configuration, reducing the component count from five gears with three magnets to a simplified arrangement with two magnets. This reduction maintains the dual measurement capability while decreasing device complexity and material requirements.
Solution Approach 2:
The patent makes the remaining magnets serve multiple functions: each magnet simultaneously provides the magnetic field for rotation angle detection and torque detection through the gear train. This multi-functionality eliminates the need for separate magnetic sources for different measurement purposes, reducing the total component count.
3Measurement precision
If traditional magnet configuration is used, then magnetic fields can influence assigned sensors, but miniaturization becomes problematic due to reciprocal screening
Solution Approach 1:
The patent removes one magnet from the traditional configuration, reducing the magnetic field sources and eliminating the reciprocal screening effect that prevents miniaturization. With fewer magnets, the magnetic fields can be more tightly controlled and positioned, enabling smaller sensor dimensions while maintaining sensitivity.
Solution Approach 2:
The patent introduces magnetic shields as intermediary elements that control and direct magnetic field paths. These shields enable precise magnetic coupling between the reduced number of magnets and their assigned sensors, maintaining high measurement precision while allowing for miniaturized sensor dimensions.
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 solution provides a simpler, cost-effective, and less interfered rotation-angle and torque sensor with improved sensitivity and resolving power, capable of measuring torsional angles beyond 360°, using a reduced number of magnets and gears, and minimizing material costs.
Implementation Method 1
two magnets that are assigned to the fourth and fifth gear, and magnetic sensors that are assigned to the third, fourth and fifth gears
Implementation Method 2
circular-segment-shaped magnetic guides are attached on the fourth gear, wherein magnetic flux guides are attached on the third gear
Implementation Method 3
The second magnetic sensor is designed as a Hall sensor
Data Source
AI summary
The rotation-angle and torsion sensor has two gears that are connected so as not to turn with shaft sections, which [gears] mesh with gears. On one of the gears a unipolar or multipolar magnet is attached. On the other gear, magnetic flux guides matching to number of poles are attached, that are configured as L shapes. One leg of the flux tranducers points in the direction of the multipolar magnet while the other legs run parallel to the gear and in fact one on one side and the other on the other side of the gear, with these legs enclosing a second sensor between them that is situated in the gear.