Integrated Eddy Current Sensing for Rotary Shaft Position and Speed
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Solution Overview
Problem
Current eddy current sensors cannot accurately detect the rotating speed of maglev rotary shafts, limiting comprehensive monitoring and real-time control of maglev motor performance.
Innovation Solution
An eddy current sensor integrating position detecting probes and rotating speed detecting probes, allowing simultaneous detection of position displacement and rotating speed, with corresponding data analysis for intensive monitoring of the rotary shaft's working state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a contact type detecting device is used to detect the rotary shaft, then the detection accuracy is improved, but the device cannot be applied to high-speed maglev rotary shafts due to contact limitations
Solution Approach 1:
The patent replaces the mechanical contact type detecting device with a non-contact eddy current sensor. The eddy current sensor uses electromagnetic induction to detect the position and speed of the maglev rotary shaft without physical contact, thereby maintaining high detection accuracy while being suitable for high-speed applications where contact devices would fail.
Solution Approach 2:
The patent introduces an intermediary target structure with conductive material on the maglev rotary shaft that interacts with the eddy current sensor. This target structure serves as a mediator that enables the non-contact sensor to detect position and speed information through eddy current effects, bridging the gap between the sensor and the rotating shaft.
2Adaptability or versatility
If an eddy current sensor is used to detect position displacement of the maglev rotary shaft, then the non-contact detection capability is achieved, but the rotating speed detection function is lost
Solution Approach 1:
The patent designs the eddy current sensor to perform multiple functions simultaneously. By using a single eddy current sensor to detect both the position displacement and the rotating speed of the maglev rotary shaft, the system achieves multi-functionality without requiring separate sensors, thereby maintaining non-contact capability while enabling speed detection.
Solution Approach 2:
The patent segments the detection functions into different detection modes within the same sensor system. The eddy current sensor processes different signal characteristics from the target structure to separately obtain position information and speed information, allowing both functions to be achieved through signal analysis of the same non-contact detection process.
3Measurement precision
If separate sensors are used for position detection and speed detection, then the detection functions are specialized, but the device complexity increases
Solution Approach 1:
The patent merges the position detection and speed detection functions into a single eddy current sensor system. The sensor uses the same non-contact detection mechanism to obtain both types of information by analyzing different aspects of the eddy current signals, thereby reducing device complexity while maintaining specialized detection capabilities for both position and speed.
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
Enables comprehensive and precise monitoring of the rotary shaft's position and speed, facilitating improved analysis and control of the maglev motor's working state.
Implementation Method 1
an eddy current sensor is employed to perform position detection of the maglev rotary shaft
Data Source
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Figure 3~4
AI summary
The present application provides an eddy current sensor for a rotary shaft and a rotary shaft apparatus. The eddy current sensor comprises: a housing; one or more eddy current type probes provided on the housing, arranged to detect the shaft position by measuring the distance between the probe and the shaft; and a rotating speed detecting probe provided on the housing. By applying the technical solution of the present application, the eddy current sensor integrates the distance detecting probe and the rotary speed detecting probe, such that while the eddy current sensor is detecting a positional displacement of the rotary shaft, it may also simultaneously detect the rotating speed of the rotary shaft, which facilitates detecting and monitoring the rotary shaft more comprehensively; besides, the detected position data and rotating speed data of the rotary shaft are corresponding to each other at any time, such that the working state of the rotary shaft may be analyzed more intensively. The housing is filled with a potting material, so that interstices within the housing are filled and the probes are plastically sealed.