Compact Optical-Magnetic Encoder Layout for Precise Servo Feedback
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Solution Overview
Problem
There is a demand for further miniaturization of encoder devices, which are essential components in servo systems and motors, to enhance their performance and integration in various applications.
Innovation Solution
The proposed solution involves an encoder design that includes a rotating body with a disk having a ring-shaped scale, an optical module for position detection, and magnetic components for detecting magnetism, allowing for compact integration and efficient detection of position, speed, and acceleration within a servo system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional encoder designs are used, then position detection accuracy is maintained, but device size is large
Solution Approach 1:
The patent positions the first magnet and first magnetic detector on opposite sides of the disk in the axial direction (rotational axis direction), utilizing the third dimension to reduce the radial width of the encoder while maintaining detection functionality. This dimensional reorganization allows compact integration without compromising measurement precision.
Solution Approach 2:
The patent integrates multiple detection functions (optical position detection via the optical module and magnetic position detection via the first magnetic detector) into a single encoder structure, merging separate detection systems into one unified device. This consolidation reduces overall device size while maintaining comprehensive detection capabilities.
2Measurement precision
If multiple detection components are integrated, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The disk serves multiple functions simultaneously: it supports the ring-shaped scale for optical detection and carries the first magnet for magnetic detection. This multi-functional design allows the same structural element to contribute to both optical and magnetic detection systems, reducing overall device complexity while maintaining high measurement precision.
Solution Approach 2:
The patent divides the detection system into distinct functional modules: an optical module for high-precision position detection and a magnetic detection system for complementary measurement. This segmentation allows each module to be optimized independently while working together, managing complexity through modular design.
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
This design enables the miniaturization of encoder devices while maintaining accurate position, speed, and acceleration detection, thereby improving the overall performance and compactness of servo systems and motors.
Implementation Method 1
an optical module that is disposed to face the disk and detects the scale
Implementation Method 2
a first magnetic detector that is disposed on the other side from the disk in the direction of the rotation axis and detects magnetism of the first magnet
Data Source
AI summary
An encoder includes a rotating body that is rotatable around a rotation axis; a disk that is fixed to the rotating body and has a scale formed in a ring shape; an optical module that is disposed to face the disk and detects the scale; a first magnet that is disposed on one side from the disk in a direction of the rotation axis and fixed to the rotating body; and a first magnetic detector that is disposed on a remaining side from the disk in the direction of the rotation axis and detects magnetism of the first magnet.