Magnetically Coupled Optical Encoder Alignment
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Solution Overview
Problem
Conventional optical encoders face accuracy issues due to misalignment between the shaft, light source, and sensors, leading to inaccurate positional and rotational data, particularly caused by drops, wear, and tolerances in mechanical components.
Innovation Solution
A magnetically coupled optical encoder system where a shaft with embedded magnetic elements is rotated by an actuation member with corresponding magnetic elements, ensuring precise alignment and movement within a hermetically sealed enclosure, reducing alignment tolerances and maintaining consistent spacing between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mechanical coupling is used between the shaft and actuation member, then the structure is simple, but alignment accuracy deteriorates due to wear, drops, and tolerances
Solution Approach 1:
The patent replaces the conventional mechanical coupling system with a magnetic coupling system. Magnetic field sources are embedded in both the shaft and actuation member, creating a non-contact magnetic field interaction that transmits rotational motion. This substitution eliminates mechanical wear, drop damage, and tolerance accumulation, thereby maintaining consistent alignment between the light source, shaft, and sensors while improving both measurement precision and reliability.
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the actuation member and shaft. The magnetic field sources create a magnetic coupling that acts as a mediator to transmit rotational motion without direct mechanical contact. This intermediary mechanism preserves alignment accuracy by eliminating the need for precise mechanical fits and reducing the impact of manufacturing tolerances and wear.
2Object-affected harmful factors
If hermetically sealed enclosure is implemented, then component protection is improved, but manufacturing complexity increases
Solution Approach 1:
The hermetically sealed enclosure serves multiple functions simultaneously: it protects the optical components (light source and sensors) from environmental contaminants, provides a stable mounting structure for the magnetic field sources, and maintains the precise spatial relationships between components. By combining protection, mounting, and alignment functions into a single integrated structure, the patent reduces overall device complexity while achieving comprehensive component protection.
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 magnetic coupling ensures accurate determination of shaft movement and rotation, enhancing data accuracy and reducing sensor saturation or insufficiency, while maintaining the optical encoder components within a protected environment.
Implementation Method 1
a first magnetic field source rigidly coupled to the shaft. When the first magnetic field source rotates, such as, for example, in response to a received magnetic field, rotation of the first magnetic field source causes the shaft to rotate about its axis
Data Source
AI summary
Embodiments of the present disclosure provide an optical encoder that has magnetic elements embedded in a shaft or shaft of the optical encoder. Further, the optical encoder is hermitically sealed and is configured to rotate based on a magnetic field between the optical encoder and an actuation member.