Single Encoder with Dual Discs for Reliable Motor Positioning
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Solution Overview
Problem
Existing motor control systems that use dual encoders to improve data reliability increase equipment size and weight, leading to higher costs, and existing solutions do not efficiently address the need for reliable data duplication without these drawbacks.
Innovation Solution
A motor control system utilizing a single encoder with two discs and sensors, where one disc detects rotation position and the other disc detects rotation count, with error detection using CRC values, and data is sent in a format that allows for efficient transmission and verification, reducing the need for redundant hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual encoder systems are used to improve data reliability, then data reliability is improved, but equipment size and weight increase
Solution Approach 1:
The patent combines two encoder functions (position detection and rotation count detection) into a single encoder device. The first detector measures rotation position within one rotation, while the second detector measures rotation count, and both are integrated in one encoder rather than using separate encoder units. This merging maintains data reliability through functional redundancy while reducing equipment weight and size.
2Reliability
If dual encoder systems are used to improve data reliability, then data reliability is improved, but equipment size increases
Solution Approach 1:
The patent integrates multiple detection functions into a single encoder structure. The first detector and second detector are both mounted on the same rotation shaft within one encoder housing, eliminating the need for separate encoder units. This consolidation reduces equipment volume while maintaining the data reliability benefits of having both position and rotation count detection capabilities.
3Reliability
If additional sensors and discs are added to the encoder, then data reliability is improved, but device complexity increases
Solution Approach 1:
The patent divides the encoder into distinct functional modules: a first detector for position measurement, a second detector for rotation count measurement, and a sender for data transmission. Each module has a specific function, and their outputs are combined to provide comprehensive motor position information with built-in error detection capabilities through CRC verification.
Data Source
AI summary
An encoder includes a first disc and a second disc, a first detector, a second detector, a rotation count detector, and a sender. The first disc and the second disc are mounted on a rotation shaft of a motor. The first detector is configured to detect a rotation position of the first disc within one rotation of the first disc. The second detector is configured to detect that the second disc has made one rotation. The rotation count detector is configured to count a rotation count of the second disc based on an output from the second detector. The sender is configured to send sending data including the rotation position and the rotation count.