Torque Sensor Stator Tooth Layout Against Magnetic Interference
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Solution Overview
Problem
Existing torque sensors in electronic power systems are susceptible to magnetic field interference from external sources, affecting the accuracy of torque measurement due to the collector acting as a path for external magnetic fields.
Innovation Solution
The sensing device incorporates a stator with first and second stator teeth, where the second tooth has a protruding portion facing a sensor, and the teeth are arranged to overlap radially, minimizing magnetic field interference by dispersing external magnetic fields through concentrically disposed third teeth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a collector is used in the torque sensor structure, then the magnetic flux can be collected and guided, but external magnetic fields can flow through the collector causing measurement errors
Solution Approach 1:
The stator teeth are divided into multiple segments (first stator teeth and second stator teeth) arranged concentrically. This segmentation allows the magnetic flux to be collected through multiple separate paths rather than a single collector, reducing the impact of external magnetic fields on any one path and improving measurement accuracy.
2Measurement precision
If multiple collectors are used to reduce magnetic field interference, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The stator teeth act as intermediary magnetic flux collectors between the rotor magnet and the Hall sensor. By using the stator teeth as the collecting structure rather than separate collector components, the patent achieves effective magnetic flux collection while maintaining a simpler overall device structure.
3Measurement precision
If the collector is positioned closer to the sensor, then magnetic flux collection is improved, but susceptibility to external magnetic fields increases
Solution Approach 1:
The patent transitions from a single-plane collector structure to a multi-layer concentric arrangement of stator teeth. This dimensional change allows magnetic flux to be collected from multiple radial positions simultaneously, improving flux detection while the distributed structure reduces vulnerability to external magnetic fields at any single location.
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 effectively prevents or minimizes magnetic field interference, ensuring accurate torque measurement by reducing the impact of external magnetic fields on the sensor, thereby enhancing measurement precision.
Implementation Method 1
a magnetic flux density sensor (hereinafter, referred to as 'Hall integrated circuit') to measure a magnetic flux density
Implementation Method 2
a rotor including a magnet
Data Source
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AI summary
An embodiment may provide a sensing device comprising: a stator comprising stator teeth; and a rotor comprising magnets, wherein: the stator teeth comprise a first stator tooth and a second stator tooth arranged to overlap the first stator tooth in the radial direction from the center of the stator; the first stator tooth comprises multiple first teeth and multiple third teeth, and the second stator tooth comprises multiple second teeth; one of the multiple first teeth is arranged to overlap one of the multiple second teeth in the radial direction; and the magnets are disposed between the multiple first teeth and the multiple third teeth, respectively.