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Cross knot-type winding fancy eddy current sensor and coil winding method thereof

An eddy current sensor, cross-junction technology, applied in coil manufacturing, inductance/transformer/magnet manufacturing, coils, etc., can solve the problems of lack of stress and strain eddy current sensors, etc., to achieve convenient installation and positioning, reduce complexity, and improve accuracy Effect

Inactive Publication Date: 2018-11-16
HENAN AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing research on eddy current stress detection is limited to the detection of unidirectional stress and strain, and there is a lack of eddy current sensors that can detect stress and strain in metal structures under plane stress state when the principal stress direction is known.

Method used

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  • Cross knot-type winding fancy eddy current sensor and coil winding method thereof
  • Cross knot-type winding fancy eddy current sensor and coil winding method thereof

Examples

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The invention provides a cross-junction meander fancy eddy current sensor for detecting stress and strain. The eddy current sensor includes a printed circuit board and a coil group on the printed circuit board. The printed circuit board can choose a flat printed circuit board or a flexible printed circuit board.

[0033] The coil set includes an excitation coil and a detection coil, and an alternating current is connected to the excitation coil to induce an eddy current on the structure under test.

[0034] Specifically, the coil set includes:

[0035] The excitation coil wound in the shape of a "ten" with wires is used. The "ten" shape has four convex parts, and each convex part includes a meandering line. The meandering line is composed of at least one meandering unit. When the meandering fold line at the top includes at le...

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Abstract

The invention discloses a cross knot-type winding fancy eddy current sensor and a coil winding method thereof. The cross knot-type winding fancy eddy current sensor comprises a printed circuit board and a coil group printed on the printed circuit board. The coil group comprises an excitation coil wound in a cross type and four groups of detection coils wound on the four convex parts of the cross type, wherein each convex part of the cross type comprises a winding broken line formed by at least one winding unit; and one group of detection coil is wound in a gap of the at least one winding unitof one convex part. In a condition of only using one sensor, stress and strain of each metal component under a plane stress state can be detected in a convenient and non-contact mode.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and relates to a cross-junction type meander fancy eddy current sensor for detecting two mutually perpendicular principal stresses and principal strains in a metal structure under a plane stress state with known principal stress directions. Background technique [0002] The vast majority of mechanical structures are made of metal materials. Effective detection of the stress state of these metal structures is of great significance for understanding their service status and evaluating their remaining life. [0003] At present, the common methods used to detect the stress state in metal structures include strain gauge method, X-ray method, ultrasonic method and magnetic method. Among these methods, the strain gauge method requires contact measurement; the X-ray method is expensive and has radiation hazards, and is only suitable for laboratory testing; the ultrasonic method requires a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/14H01F5/00H01F41/04
CPCH01F5/003H01F41/041G01D5/14
Inventor 李建伟黄伟华王栋田辉刘新萍
Owner HENAN AGRICULTURAL UNIVERSITY
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