Encoder Magnetic Shielding Cover Sealing Design
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Solution Overview
Problem
The encoder disclosed in Patent Literature 1 lacks waterproof and dustproof properties due to the use of a soft magnetic cover with curved surfaces, which requires high accuracy in manufacturing, making it costly to achieve IP65 or higher protection ratings, and the existing solutions either increase manufacturing costs or compromise magnetic shielding performance.
Innovation Solution
An encoder design featuring a magnetic shielding cover made of soft magnetic material with a sealing member compressed between flat surfaces of the protective cover and the base part, ensuring effective magnetic shielding, waterproofing, and dustproofing without the need for high-accuracy manufacturing, using a sealing member like an O-ring between the protective cover and the base part, and employing cost-effective materials and assembly methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the soft magnetic cover is used to compress the O-ring between curved surfaces, then magnetic shielding property is achieved, but waterproof and dustproof performance equal to or higher than IP65 is difficult to secure due to insufficient working accuracy of press working
Solution Approach 1:
The cover is divided into two distinct functional parts: a soft magnetic cover for magnetic shielding and a separate protective cover for waterproofing. This segmentation allows each part to be optimized for its specific function without compromising the other.
Solution Approach 2:
A sealing member (O-ring) is introduced as an intermediary element between the protective cover and the base part. This sealing member creates a reliable seal that achieves IP65 or higher waterproof and dustproof performance, independent of the manufacturing precision of the curved surfaces.
2Manufacturing precision
If the cover is manufactured by cutting machining to machine the part to compress the O-ring with increased accuracy, then waterproof and dustproof performance is improved, but manufacturing cost increases
Solution Approach 1:
The cover is divided into two distinct functional parts: a soft magnetic cover for magnetic shielding and a separate protective cover for waterproofing. This segmentation allows each part to be optimized for its specific function without compromising the other.
Solution Approach 2:
A sealing member (O-ring) is introduced as an intermediary element between the protective cover and the base part. This sealing member creates a reliable seal that achieves IP65 or higher waterproof and dustproof performance, independent of the manufacturing precision of the curved surfaces.
3Ease of manufacture
If press working is used to manufacture the cover, then manufacturing cost is reduced, but working accuracy is insufficient to achieve IP65 or higher waterproof and dustproof performance
Solution Approach 1:
The cover is divided into two distinct functional parts: a soft magnetic cover for magnetic shielding and a separate protective cover for waterproofing. This segmentation allows each part to be optimized for its specific function without compromising the other.
Solution Approach 2:
A sealing member (O-ring) is introduced as an intermediary element between the protective cover and the base part. This sealing member creates a reliable seal that achieves IP65 or higher waterproof and dustproof performance, independent of the manufacturing precision of the curved surfaces.
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 provides an encoder with enhanced magnetic shielding, waterproof, and dustproof properties while minimizing manufacturing costs, ensuring reliable performance in harsh environments and maintaining magnetic shielding functionality.
Implementation Method 1
a magnetic shielding cover made of a soft magnetic material
Implementation Method 2
the sealing member is compressed between the base part and the protective cover
Data Source
AI summary
An encoder includes: a magnet rotatably supported; a control board including a magnetic field sensor that detects a magnetic field produced by the magnet and outputs a signal, and an arithmetic unit that detects rotation of the magnet on the basis of the output of the magnetic field sensor; a magnetic shielding cover made of a soft magnetic material; an encoder bracket used to fix the magnetic shielding cover; a protective cover fixed with being sandwiched between the magnetic shielding cover and the encoder bracket to cover the magnet and the control board to prevent entry of foreign substances; and a sealing member sandwiched between the protective cover and the encoder bracket. The magnetic shielding cover covers the magnet, the control board, and the protective cover, and the sealing member is compressed between the encoder bracket and the protective cover.