Yoke Unit Positioning via Resin Recesses and Mold Projections
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Solution Overview
Problem
Conventional yoke units face accuracy issues in determining the positions of first and second yokes due to errors in through hole positions, leading to reduced accuracy and detection sensitivity in torque detection.
Innovation Solution
A yoke unit design with a recessed part in the resin section and a V-shaped projecting part on the lower mold to accurately position the yokes, eliminating the need for through holes and reducing magnetic resistance, thereby enhancing positional accuracy and detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If through holes are used to determine the positions of first and second yokes, then the manufacturing process is simple, but the positioning accuracy is reduced due to errors in through hole positions
Solution Approach 1:
The invention removes the through holes from the yoke structure and replaces them with recessed parts formed directly in the resin section. This extraction of the problematic through holes eliminates the source of positioning errors while maintaining the positioning function through the mold's projecting parts.
Solution Approach 2:
The invention introduces the mold's projecting parts as an intermediary element to determine the positions of the first and second yokes. Instead of relying on through holes in the yokes themselves, the projecting parts of the mold serve as the positioning reference, transferring the positioning function from the yoke structure to the molding process.
2Strength
If resin section is made thicker to ensure structural integrity, then strength is improved, but weight increases and magnetic resistance increases
Solution Approach 1:
The invention applies local quality by creating recessed parts in specific locations of the resin section where structural integrity is already sufficient. This allows the resin thickness to be reduced locally in areas where full thickness is not needed, thereby reducing overall weight and magnetic resistance while maintaining strength in critical areas.
3Measurement precision
If through holes are formed in yoke cores, then positioning is enabled, but magnetic resistance increases and detection sensitivity is reduced
Solution Approach 1:
The invention extracts the through holes from the yoke cores, eliminating them entirely from the magnetic path. By forming recessed parts only in the non-magnetic resin section, the magnetic continuity of the yoke cores is preserved, thereby reducing magnetic resistance and maintaining detection sensitivity while still achieving positioning through the mold's projecting parts.
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 proposed design suppresses the reduction of accuracy in yoke positioning and detection sensitivity, achieving precise torque detection while reducing the weight and magnetic resistance of the yoke unit.
Implementation Method 1
a resin section that makes the first and second yokes integral with each other
Implementation Method 2
a first yoke with multiple first magnetic pole teeth; a second yoke with multiple second magnetic pole teeth
Data Source
Figure 1
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AI summary
A yoke unit (50) comprises a first yoke (60), a second yoke (70), and a resin section (80). The first yoke (60) includes multiple first magnetic pole teeth (61). The second yoke (70) includes multiple second magnetic pole teeth (71). The first magnetic pole teeth (61) and the second magnetic pole teeth (71) are arranged alternately. The resin section (80) makes the yokes (60 and 70) integral with each other. The resin section (80) includes a recessed part (82) formed in an inner surface (81) of the resin section (80). The recessed part (82) is arranged between the first magnetic pole tooth (61) and the second magnetic pole tooth (71).