Absolute Encoder Magnetism Detection Case for Variable Shielding
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Solution Overview
Problem
Existing magnetism detection devices in absolute encoders face challenges with detection accuracy due to external magnetic flux interference, requiring multiple shielding members with varying thicknesses to adapt to different environments and specifications.
Innovation Solution
A magnetism detection device with a case design that accommodates shielding members of different thicknesses, featuring recessed portions and protruding portions for easy attachment, and includes boss portions and screw holes for secure fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic shielding member is provided to prevent external magnetic flux interference, then detection accuracy is improved, but device complexity increases due to the need to accommodate multiple shielding members with different thicknesses
Solution Approach 1:
The recessed portion of the case is designed with a universal structure that can accommodate shielding members of different thicknesses. By providing a recessed portion with sufficient depth and appropriate positioning features, the same case structure serves multiple shielding requirements without needing multiple different case designs, thus improving detection accuracy while maintaining structural simplicity.
Solution Approach 2:
The shielding member is nested within the recessed portion of the case, allowing the shielding member to be integrated into the case structure. This nesting approach enables the shielding member to be securely positioned while maintaining a compact overall structure, accommodating different thicknesses without increasing external dimensions or structural complexity.
2Adaptability or versatility
If shielding members with different thicknesses are used to adapt to different environments and specifications, then adaptability is improved, but ease of manufacture deteriorates due to the need to manage multiple component variants
Solution Approach 1:
The shielding function is segmented from the case structure, allowing the shielding member to be a separate, interchangeable component. This segmentation enables different thicknesses of shielding members to be manufactured independently and then installed in the same case by positioning them in the recessed portion, improving adaptability while simplifying manufacturing through component standardization.
Solution Approach 2:
The thickness parameter of the shielding member is made variable while keeping other dimensions and mounting features standardized. By maintaining consistent width, length, and positioning features across different shielding member variants, only the thickness parameter needs to be changed to adapt to different environments, thereby improving versatility without significantly increasing manufacturing complexity.
3Adaptability or versatility
If multiple shielding members need to be attached to the case, then adaptability is improved, but ease of operation deteriorates due to the need to precisely position and secure multiple components
Solution Approach 1:
The case is pre-designed with a recessed portion that precisely fits the shielding member, and positioning protrusions are pre-formed on the shielding member. This preliminary design of the mounting structure eliminates the need for complex alignment operations during assembly, as the protrusions automatically guide the shielding member into the correct position within the recessed portion, improving ease of operation while maintaining adaptability.
Solution Approach 2:
The positioning protrusion and recessed portion structure enables the shielding member to self-position and self-align during installation. The geometric constraints of the protrusion fitting into the recessed portion automatically ensure correct orientation and location, eliminating the need for external alignment tools or complex assembly procedures, thereby improving ease of operation.
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
Enables easy attachment of shielding members with varying thicknesses, enhancing detection accuracy by minimizing external magnetic interference.
Implementation Method 1
a magnetic sensor configured to detect a magnetic flux from the magnet
Implementation Method 2
a shielding member having a flat plate shape and a shape corresponding to the upper surface portion and attached to the upper surface portion
Data Source
AI summary
Shielding members having different thicknesses can be easily attached. A magnetism detection device includes a magnet (Mr) magnetized, an angle sensor (Sr) as a magnetic sensor configured to detect a magnetic flux from the magnet (Mr), a magnet holder holding the magnet (Mr), and a second layshaft gear shaft. The magnetism detection device includes a case including a plurality of outer wall portions and a lid portion and configured to accommodate the magnet (Mr) and the magnetic sensor (Sr) inside and a shielding member having a flat plate shape and a shape corresponding to the lid portion and attached to the lid portion. The shielding member includes a protruding portion protruding outward from an outer peripheral portion. The case includes a recessed portion opening inward at an end portion outside of the lid portion and configured to accommodate the protruding portion. The recessed portion includes a plurality of sidewall portions having different widths and a plurality of upper wall portions having different heights.