Torque Sensor Stator Holder Lateral Vibration Control
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Solution Overview
Problem
Conventional torque sensors experience reduced reliability due to stator holder vibration in the lateral direction perpendicular to the axis, affecting the accuracy of torque measurement in vehicle steering systems.
Innovation Solution
The torque sensor design includes a stator holder with protrusions that face the inner peripheral surface of the casing openings, ensuring the stator is fixed and rotated within guide grooves, preventing lateral vibration and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stator holder is not fixed in the lateral direction, then the device complexity is reduced, but the stator holder vibrates causing reduced reliability
Solution Approach 1:
The patent introduces a lateral fixing structure consisting of guide grooves and guide protrusions as an intermediary mechanism between the stator holder and the casing. This mediator prevents lateral vibration of the stator holder without requiring complex fixation systems, thereby improving reliability while maintaining structural simplicity.
Solution Approach 2:
The patent addresses the lateral vibration problem by introducing constraints in the lateral dimension (perpendicular to the rotational axis). The guide grooves and protrusions provide guidance and constraint in the radial direction, allowing the stator holder to rotate freely along the axial direction while preventing lateral displacement, thus solving the vibration issue without over-constraining the system.
2Reliability
If the stator holder is laterally fixed, then vibration is prevented improving reliability, but the device complexity increases
Solution Approach 1:
The guide grooves formed in the casing and the guide protrusions on the stator holder act as intermediary elements that provide lateral constraint. These simple geometric features integrate into the existing structure without adding complex fixation mechanisms, achieving reliable vibration prevention with minimal increase in device complexity.
Solution Approach 2:
The patent merges the lateral fixing function with the existing casing and stator holder structures. The guide grooves are formed directly in the casing, and the guide protrusions are integrated into the stator holder, combining multiple functions (structural support, lateral constraint, and rotational guidance) into unified components rather than adding separate fixation systems.
3Measurement precision
If the stator is fixed in the lateral direction, then measurement precision is improved, but the device complexity increases
Solution Approach 1:
The guide grooves and guide protrusions serve as intermediary structures that ensure precise lateral positioning of the stator. By providing smooth guidance surfaces and precise geometric配合, these intermediaries maintain consistent air gaps between the stator and rotor, thereby improving torque measurement precision without requiring complex positioning mechanisms.
Solution Approach 2:
The patent achieves precise stator positioning by constraining the stator in the lateral dimension while allowing free rotation in the axial dimension. The guide grooves provide precise radial positioning, ensuring consistent air gap dimensions, which is critical for accurate torque measurement, while maintaining simplicity through the use of basic geometric constraints rather than complex positioning systems.
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 stator vibration, thereby improving the reliability and accuracy of torque sensor operations in vehicle steering systems.
Implementation Method 1
a magnetic device configured to detect a magnetization level collected by the collector
Implementation Method 2
a magnetic device configured to detect a magnetization level collected by the collector
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed is a torque sensor comprising: a first casing comprising a first opening; a second casing comprising a second opening; a stator comprising a stator holder that is placed in the interior of the first casing and the second casing and at least one stator tooth that is secured to the stator holder; and a rotor that is rotatably disposed in the stator, wherein the stator comprises a protrusion facing the inner peripheral surface of the first opening.