Displacement Sensor Redundancy for Maglev Shaft Fault Detection
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Solution Overview
Problem
The magnetic levitation motor system is unable to operate or is damaged due to faults in the displacement sensor, which lacks effective redundancy and real-time fault detection capabilities.
Innovation Solution
A fault processing system for a displacement sensor that integrates a probe ring with multiple detecting probes and a spare probe, analog selector switches, and a magnetic levitation bearing controller to detect and replace faulty probes, ensuring continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple detecting probes are used to detect displacement, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
A spare probe is pre-configured in the probe ring alongside the detecting probes. When a detecting probe fails, the spare probe is activated through switching circuitry to replace the faulty probe, ensuring continuous operation without requiring system shutdown or manual intervention.
Solution Approach 2:
The spare probe is designed as an identical copy of the detecting probes, with the same structural configuration and detection capabilities. This allows the spare probe to seamlessly replace any detecting probe when failure occurs, maintaining system functionality without requiring complex adaptation mechanisms.
2Reliability
If redundancy is added to the displacement sensor, then fault tolerance is improved, but probe ring structure becomes more complex
Solution Approach 1:
The spare probe is integrated into the same probe ring structure as the detecting probes, sharing the same mounting configuration and spatial arrangement. The switching mechanism is incorporated into the existing signal processing circuitry, allowing redundancy to be added without creating separate structural systems.
Solution Approach 2:
The probe ring structure is designed to accommodate both detecting probes and a spare probe using the same mounting interfaces and signal connections. The switching circuitry enables any probe in the ring to be activated for detection, making the structure universally applicable to different probe configurations.
3Reliability
If real-time fault detection is implemented, then system reliability is improved, but control system complexity increases
Solution Approach 1:
The controller continuously monitors the output signals from the detecting probes and compares them against expected parameter ranges. When a probe output deviates from the normal range, the controller identifies the probe as faulty and automatically switches to the spare probe, providing real-time fault detection and response.
Solution Approach 2:
The system automatically detects probe failures and performs self-repair by switching to the spare probe without requiring external intervention. The switching mechanism is triggered automatically by the controller based on real-time signal monitoring, enabling the system to service itself when faults occur.
Data Source
AI summary
A fault processing method for a displacement sensor includes: receiving a plurality of detected signals from a plurality of detecting probes and a given signal of a spare probe, wherein the detecting probes are configured to detect a displacement value of a rotation shaft of a magnetic levitation motor to obtain the detected signals, and the spare probe is configured to replace a faulty probe among the plurality of detecting probes; determining whether there is a faulty probe among the plurality of detecting probes based on the plurality of detected signals and the given signal; and connecting the given signal of the spare probe to the faulty probe corresponding to a case that a determination result is yes.