Torque Sensor Collector Assembly Flux Leakage Reduction
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Solution Overview
Problem
Conventional torque measurement devices for steering systems are large in size and suffer from significant flux leakage, which affects their accuracy and efficiency in measuring torque, particularly under high resistance conditions.
Innovation Solution
A torque measurement device featuring a stator with alternating annular rings and a ring-shaped magnet, along with a collector assembly that includes bent collector members to form an insertion space for a magnetic element, minimizing external size and preventing flux leakage through optimized flux transfer and concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional torque measurement device is used, then torque measurement function is provided, but the device size is large
Solution Approach 1:
The magnetic element is inserted into the insertion space formed by the bent collector members, nesting the detection component within the existing structure. The collector members themselves are bent to form the insertion space, creating a nested configuration that reduces overall device volume while maintaining the measurement function
Solution Approach 2:
The collector members are bent from flat or linear configurations into three-dimensional curved structures that form the insertion space. This dimensional transformation allows the magnetic element to be positioned within the existing structure rather than requiring additional external space, thereby minimizing device size
2Object-generated harmful factors
If a conventional torque measurement device is used, then torque measurement function is provided, but flux leakage is significant
Solution Approach 1:
The bent collector members are designed to redirect and concentrate the magnetic flux that would otherwise leak into the surrounding space. By bending the collector members toward the space portion, the structure captures the stray flux and redirects it through the magnetic element, converting harmful flux leakage into useful measurement signal
Solution Approach 2:
The magnetic element acts as an intermediary between the magnet and the external environment. It is positioned in the insertion space formed by the collector members, which mediate the magnetic flux path. This intermediary configuration allows precise measurement while controlling flux distribution and minimizing leakage
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 effectively minimizes the device's size while maintaining performance and preventing flux leakage, enhancing the precision of torque measurement and stability of the steering system.
Implementation Method 1
the technique of measuring a magnetic field between the steering shaft and a magnet coupled to the steering shaft to detect a torque
Implementation Method 2
a collector assembly including a first collector member and a second collector member to form at least one insertion space in which a magnetic element is disposed
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Provided is a torque measurement device including a stator in which a space portion is formed by a first annular ring and a second annular ring having protrusion pieces, a ring-shaped magnet disposed in the space portion, and a collector assembly including a first collector member and a second collector member to form at least one insertion space in which a magnetic element is disposed, wherein the insertion space is formed by bending an end of the first collector member and an end of the second collector member toward the space portion.