Magnetic Absolute Encoder Dual-System Redundancy
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Solution Overview
Problem
Conventional magnetic absolute encoders face a trade-off between high-speed, high-precision detection and low power consumption, particularly during backup operations, and lack effective countermeasures for detection errors in the main detection system.
Innovation Solution
A magnetic absolute encoder system that includes a main calculation means for high-speed, high-precision detection during normal operation and a backup calculation means for low-power consumption during backup, with an abnormality diagnosis means to detect and judge detection errors by comparing values from both systems, ensuring reliability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single detection system is used for high-speed, high-precision detection, then detection speed and precision are improved, but power consumption increases and reliability during backup operations deteriorates
Solution Approach 1:
The detection system is segmented into two independent detection systems (main detection system and backup detection system), each capable of performing detection functions. The main detection system operates at high speed with high precision during normal operation, while the backup detection system operates at low power consumption during backup operations. This segmentation allows the system to switch between different operational modes without compromise.
Solution Approach 2:
The system dynamically switches between the main detection system and the backup detection system based on power supply status. During normal operation, the main detection system is active for high-performance detection. When power interruption occurs, the system dynamically transitions to the backup detection system powered by the backup power supply, optimizing power consumption while maintaining detection functionality.
2Reliability
If a single detection system is used, then device complexity is reduced, but reliability and error detection capability deteriorate
Solution Approach 1:
The main detection system and backup detection system are merged into a unified encoder structure sharing common components such as the magnetic sensor, magnetic drum, and signal processing circuits. This merging approach allows redundancy for reliability while minimizing the increase in device complexity through shared resources.
Solution Approach 2:
The system implements feedback mechanisms where the backup detection system continuously monitors and compares its detection results with the main detection system. During normal operation, the backup system serves as a reference for validating the main system's accuracy. When abnormalities are detected through comparison, the system can switch to the backup system or generate error signals, enhancing reliability through self-diagnosis.
3Use of energy by moving object
If the backup power supply is used intermittently, then power consumption is reduced, but detection continuity and reliability may deteriorate
Solution Approach 1:
The backup power supply is pre-charged and prepared in advance during normal operation. When power interruption occurs, the backup power supply immediately activates to power the backup detection system, ensuring continuous detection operation without interruption. This preliminary preparation eliminates detection gaps that would occur with intermittent power supply.
Solution Approach 2:
The system changes operational parameters when switching between main and backup detection systems. The backup detection system operates with adjusted detection timing and sampling rates optimized for low power consumption while maintaining sufficient detection accuracy. These parameter changes allow reliable detection operation during backup mode without requiring continuous high power supply.
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 system achieves high reliability by automatically detecting and reporting abnormalities, ensuring accurate calculations during both normal and backup operations while maintaining low power consumption, thereby enhancing the overall reliability of the encoder.
Implementation Method 1
a multipolar-magnetized rotor or magnetic drum... The multipolar-magnetized rotor or magnetic drum is attached in a coaxial configuration to the motor rotating shaft
Implementation Method 2
a pair of magnetic detection elements... sine wave signals differing in phase by 90 degrees are output in association with the rotation of the motor rotating shaft
Data Source
AI summary
In the magnetic absolute encoder, an ordinary operating circuit and an ordinary/backup operating circuit are actuated during ordinary operation in which power is supplied from the ordinary operating power supply; the single-rotation absolute value (1) and single-rotation absolute value (2) detected by these circuits are compared by the abnormality diagnosis circuit, and the presence or absence of an abnormality is automatically judged During backup in which the ordinary operating power supply is interrupted, only the low-power-consumption ordinary/backup operating circuit is actuated, and the multiple-rotation value (2) is detected At the point in time at which the system is returned to ordinary operation, the multiple-rotation value setting circuit sets the multiple-rotation value (2) as the multiple-rotation value (1) of the ordinary operating circuit. As a result, the calculation operation of the multiple-rotation value (1) can be restarted.