Eddy Current Sensor Probe Nesting for Maglev Reliability
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Solution Overview
Problem
Eddy current sensors for maglev motors face issues such as probe damage due to protrusion, lack of environmental compensation, and temperature and pressure instability, leading to reduced reliability and service life.
Innovation Solution
The design includes probes housed within the sensor's protective structure, a compensation probe for environmental adjustments, and a proximitor external to the housing to mitigate environmental impacts, ensuring probe protection and enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If probes protrude outside the housing, then the sensing function is improved, but the probe is easily damaged and service life is reduced
Solution Approach 1:
The probes are nested inside the housing rather than protruding outward. The housing serves as a protective container that houses the probe elements, allowing the sensing function to be maintained while the probe is protected from external damage. This nesting arrangement resolves the contradiction by keeping the sensitive probe element inside the protective structure.
Solution Approach 2:
A probe protective plate is introduced as an intermediary element between the probe and the external environment. This protective plate allows the probe to maintain its sensing capability while being shielded from direct external forces and damage, thus resolving the contradiction between sensing function and damage resistance.
2Adaptability or versatility
If no compensation probe is provided, then the device complexity is reduced, but the sensor cannot operate in severe environments such as high temperature and high pressure
Solution Approach 1:
The compensation probe serves multiple functions: it compensates for environmental effects (temperature and pressure), provides reference measurements, and enables the sensor to operate in severe environments. By adding this multi-functional element, the sensor gains environmental adaptability while the overall structure remains integrated and manageable.
Solution Approach 2:
The compensation probe measures changes in environmental parameters (temperature and pressure) and uses these measurements to compensate for their effects on the main probe's readings. By introducing this parameter-based compensation mechanism, the sensor can accurately operate in varying environmental conditions without requiring a completely redesigned structure.
3Volume of moving object
If the proximitor is integrated into the housing, then the device compactness is improved, but the control circuit components have higher requirements on temperature stability and pressure stability
Solution Approach 1:
The sensor system is segmented into separate functional modules: the housing containing the probes and protective structures, and the proximitor containing the control circuit components. This segmentation allows the control circuit to be positioned in an environment with more stable temperature and pressure conditions, improving reliability while maintaining a compact overall device design through modular integration.
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 configuration enhances the reliability and precision of the eddy current sensor, allowing it to operate effectively in harsh environments with extended service life and improved fault resistance.
Implementation Method 1
a non-contact type eddy current displacement sensor is adopted for real-time detection
Implementation Method 2
the eddy current sensor is largely affected by environmental temperature and thus cannot be applied to places with a severe environment such as high temperature and high pressure
Data Source
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AI summary
The present invention provides an eddy current sensor, comprising: a housing; a plurality of probes which are all disposed inside the housing, probing ends of the probes being all disposed at inner side of an exterior surface of the housing to avoid the probing ends of the probes from protruding out of the exterior surface of the housing. Because the probing ends of the plurality of probes are all located at the inner side of the exterior surface of the housing, the housing will protect the probes when the eddy current sensor is hit by an external force, thereby avoiding damage of the probes due to the impact, which reduces fault rate of the probes, enhances use reliability of the eddy current sensor, and prolongs service life of the eddy current sensor.