CN108693245B - Triangular surrounding winding type eddy current sensor and coil winding method thereof - Google Patents
Triangular surrounding winding type eddy current sensor and coil winding method thereof Download PDFInfo
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- CN108693245B CN108693245B CN201810407091.9A CN201810407091A CN108693245B CN 108693245 B CN108693245 B CN 108693245B CN 201810407091 A CN201810407091 A CN 201810407091A CN 108693245 B CN108693245 B CN 108693245B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
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Abstract
The invention provides a triangular surrounding winding type eddy current sensor and a coil winding method thereof, wherein the triangular surrounding winding type eddy current sensor comprises a printed circuit board and a coil group printed on the printed circuit board; the coil assembly includes: an excitation coil wound in a triangle, each side of the triangle including a meandering line parallel to the side, the meandering line being composed of a plurality of meandering units connected in series; and at least one set of detection coils wound in the meandering gap of each side of the excitation coil, each set of detection coils being wound in at least one meandering cell. The invention can conveniently detect the stress and strain in various metal components in a plane stress state in a non-contact way under the condition of only using one sensor.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing, and relates to a triangular surrounding winding type eddy current sensor for detecting partial stress and linear strain in three different directions in a metal structure in a plane stress state.
Background
Most of mechanical structures are made of metal materials, and effective detection of the stress state of the metal structures is of great significance for understanding the service state and evaluating the residual life of the metal structures.
Common methods currently used to detect stress states in metal structures include strain gauge methods, X-ray methods, ultrasonic methods, magnetic methods, and the like. Among these methods, the strain gauge method requires contact measurement; the X-ray method is expensive in equipment, has radiation danger and is only suitable for laboratory detection; the ultrasonic method requires a coupling agent; magnetic sensing is only suitable for the detection of ferromagnetic materials.
The eddy current detection method has the advantages of simple and convenient operation, low cost, no need of a coupling agent, capability of non-contact measurement and the like, and has been widely applied to the aspect of detecting the stress of a metal structure. In the elastic range of the material, the strain of the metal structure is in a linear relationship with the stress, so that the eddy current detection method can also be used for detecting the strain of the metal structure.
The existing eddy current stress detection research is limited to the detection of unidirectional stress and strain, and is lack of an eddy current sensor capable of detecting the stress and strain directions and an eddy current sensor capable of detecting the stress and strain in a metal structure in a plane stress state when the main stress direction is unknown.
Disclosure of Invention
The invention aims to provide an eddy current sensor capable of detecting stress and strain in a metal structure in a plane stress state.
The invention adopts the following technical scheme:
a triangular-surround serpentine eddy current sensor includes a printed circuit board and a coil assembly printed on the printed circuit board;
the coil assembly includes:
an excitation coil wound in a triangle, each side of the triangle including a meandering line parallel to the side, the meandering line being composed of a plurality of meandering units connected in series;
and at least one set of detection coils wound in the meandering gap of each side of the excitation coil, each set of detection coils being wound in at least one meandering cell.
Each group of detection coils at least comprises two independent detection coils, wherein one detection coil is wound in a gap on the same side of the serial winding units, and the other detection coil is wound in a gap on the other side of the serial winding units.
The distance between the detection coil wound in the winding unit of each side and the conducting wire forming the winding unit satisfies the following conditions: when the current is applied, the detection coil can detect the eddy current change information excited by the conducting wire forming the winding unit.
The detection coils wound on the same side of the winding unit are not less than two, the detection coils in the gaps of the winding unit are all non-closed rectangles, and the at least two detection coils wound on the same side of the winding unit of the same winding broken line are connected in series or respectively connected with external detection equipment.
The exciting coil is wound into an equilateral triangle or an isosceles triangle.
Triangular exciting coils with corresponding positions and the same shape are arranged on at least two board layers of the printed circuit board, and the exciting coils on different board layers are connected in series;
the detection coils with corresponding positions and the same shape are arranged on at least two plate layers of the printed circuit board, and the detection coils on different plate layers are connected in series;
the excitation coil and the detection coil are positioned on the same slab or different slabs; the detection coil does not intersect the excitation coil when located on the same layer.
A coil winding method of a triangular surrounding winding type eddy current sensor comprises an excitation coil winding method and a detection coil winding method; setting the bottom edge of the triangle as an x axis and setting the direction vertical to the x axis as a y axis;
the method for winding the exciting coil comprises the following steps:
starting from a starting point S1, winding a meandering line of a side a from outside to inside the triangle in the positive direction of the x-axis, then winding a meandering line of a side B from inside to outside the triangle after turning an angle A, and winding a meandering line of a side c from outside to inside the triangle after turning an angle B;
the angle A is the included angle between the edge a and the edge B, and the angle B is the included angle between the edge B and the edge c.
The winding mode of the winding broken line of the edge a is as follows:
(1) starting from a starting point S1, routing a distance D1 in the positive direction of the x axis, then routing a distance Dd1 after bending the film in the counterclockwise direction by an angle A1, and routing a distance D2 parallel to the edge a after bending the film in the counterclockwise direction by an angle A2; both D1 and D2 are the length of the serpentine cell, and D1 is not less than D2, and Dd1 is the width I of the serpentine cell;
(2) the wiring distance Dd2 is formed after the bending is carried out clockwise by an angle A3, and a serpentine unit is formed; dd2 is the width II of the serpentine element;
(3) after the bending is carried out clockwise by an angle A4, another winding unit is wound;
(4) a plurality of meandering units connected in series to form a meandering line; and the length of the (n + 1) th meandering unit is smaller than the length of the nth meandering unit;
the winding mode of the winding broken line of the side b is as follows:
(1) after the last meandering unit of the side a is wound and turns clockwise by an angle A4, the wire is parallel to the side a and runs a distance D3 in the positive direction of the x axis, the wire turns by the angle A, and winding of the meandering broken line of the side b is started; said distance D3 is not greater than the distance D2 of the last serpentine cell of the serpentine fold of edge a;
(2) the distance D4 is traced parallel to the side b, then the distance Dd1 is traced after being bent clockwise by an angle A5, and the distance D5 is traced parallel to the side b after being bent clockwise by an angle A6; both D4 and D5 are serpentine cell lengths, and distance D5 is no less than distance D4;
(3) the wiring distance Dd2 is formed after the circuit board is bent counterclockwise by an angle A7, and a serpentine unit is formed;
(4) after the bending angle A8 is anticlockwise bent, another winding unit is wound;
(5) a plurality of meandering units connected in series to form a meandering line; and the length of the (n + 1) th meandering unit is longer than the length of the nth meandering unit;
the winding mode of the winding broken line of the edge c is as follows:
(1) after the last meandering unit of the side B is wound and rotates anticlockwise by an angle A8, and the wire is parallel to the side B by a routing distance D6, the wire rotates by an angle B, and winding of the meandering broken line of the side c is started; said distance D6 is not less than distance D5 of the last serpentine cell of the serpentine fold line of edge b;
(2) a routing distance D7 parallel to the side c, a routing distance Dd1 after being bent counterclockwise by an angle A9, and a routing distance D8 parallel to the side c and opposite to the D7 after being bent counterclockwise by an angle A10; both D7 and D8 are serpentine cell lengths, and distance D7 is no less than distance D8;
(3) the wiring distance Dd2 is formed after the bending is carried out clockwise by an angle A11, and a serpentine unit is formed;
(4) after the bending is carried out clockwise by an angle A12, another winding unit is wound;
(5) a plurality of meandering units connected in series to form a meandering line; and the length of the (n + 1) th meandering unit is smaller than the length of the nth meandering unit;
wherein the absolute values of angle a1, angle A3, angle a6, angle A8, angle a9, angle a11, and 180 degrees are not greater than 90 degrees; and the absolute values of angle a2, angle a4, angle a5, angle a7, angle a10, angle a12, and 180 degrees are not less than 90 degrees.
The detection coil winding method comprises the following steps:
winding a detection coil in the gaps of the meandering units on one side of the meandering line from the starting position on each side of the excitation coil, or respectively winding a detection coil in the gaps on both sides of the meandering units; the detection coil is a meandering line having a certain distance from a meandering line of the excitation coil.
The width I and the width II of the same meandering unit of the exciting coil are the same or different; when a detection coil is wound in the gap on the same side of at least one winding unit, the width I and the width II of the same winding unit of the detection coil are different.
The invention has the beneficial effects that:
(1) the invention provides the eddy current sensor which can detect the partial stress and linear strain in three different directions in the metal structure in the plane stress state under the condition of unknown main stress direction, and overcomes the defect that the existing eddy current sensor can only detect the unidirectional stress and strain. After the eddy current sensor provided by the invention is used for detecting the partial stress and the linear strain in three different directions in the metal structure, the magnitude and the direction of the main stress and the main strain in the metal structure can be further determined according to an experimental stress analysis method.
(2) With this sensor, the stress and strain in various metal members in a plane stress state can be detected in a relatively convenient and non-contact manner by using only one sensor. In the existing research, in order to detect the partial stress and the linear strain in three directions, more than 3 eddy current sensors are needed, and the lifting consistency between a plurality of sensors and a detected structure is difficult to ensure. Therefore, the invention is beneficial to reducing the complexity of a testing system when the stress-strain is detected by the eddy current method and improving the accuracy of the stress-strain detection result.
Drawings
FIG. 1 is a block diagram of an embodiment of the present invention.
Fig. 2 is a broken line structure diagram of the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention provides a triangular surrounding winding type eddy current sensor for detecting stress and strain. The printed circuit board can be a planar printed circuit board or a flexible printed circuit board.
The coil group comprises an exciting coil and a detecting coil, and an alternating current is introduced into the exciting coil to induce an eddy current on the measured structure.
Specifically, the coil assembly includes:
(1) the triangular excitation coil is wound by using a conducting wire, the excitation coil can be an isosceles triangle or an equilateral triangle, and the equilateral triangle is optimal, and the conducting wire can be one or a plurality of parallel windings. The wire winds each side of the triangle in a reciprocating mode to wind at least one meandering unit, and then the meandering units are connected in series; each side may have a plurality of serpentine cells parallel to each side, the plurality of serpentine cells of each side being connected in series as one serpentine line. The two meandering units are connected by a connecting wire, and the included angle between the wire of the meandering unit and the connecting wire can be 90 degrees or other suitable angles.
(2) A detection coil wound in the serpentine fold of each side is also included. Each winding fold line is internally provided with at least one group of detection coils, each group of detection coils is wound in at least one winding unit, each detection coil is formed by winding at least one conducting wire, and the conducting wires can be wound in parallel when being wound. The pitch of the detection coil should be smaller than the meandering pitch of the excitation coil to ensure that the meandering unit of the detection coil can be arranged within the turn-back gap of the meandering unit of the excitation coil.
The number of the detection coils may be three, and in this case, each coil is arranged in a set in a turn-back gap of a meandering line on one side of the excitation coil. The number of the detection coils may be six, two of which are in a group, and the two detection coils of the same group are respectively arranged on the left and right sides of the folding back gap of the meandering line on one side of the excitation coil.
When necessary, the two detection signals of the same group can be superposed by changing the head-to-tail wiring mode of each detection coil of each group or by connecting external leads on the bonding pads, so that the output signal is increased. At least two detection coils are arranged in each group, wherein one detection coil is wound in the gap on the same side of the serial winding unit, and the other detection coil is wound in the gap on the other side of the serial winding unit. Furthermore, when the number of the winding units is large, more than one detection coil can be wound on the same side of the winding units, a detection coil can be wound in each winding unit, a detection coil can also be wound in some winding units, and at least two detection coils wound on the same side of the winding units are connected in series or respectively connected with external detection equipment. The detection sensitivity of the sensor can be improved by connecting a plurality of detection coils in series, and the number of the serpentine units can be set according to different conditions and different measurement requirements.
The distance between the detection coil wound in the winding unit of each side and the conducting wire forming the winding unit satisfies the following conditions: when the current is applied, the detection coil can detect the eddy current change information excited by the conducting wire forming the winding unit.
When necessary, triangular exciting coils with corresponding positions and the same shape can be arranged on a plurality of board layers of the printed circuit board, and the exciting coils on different board layers are connected in series, so that the eddy current density on a unit detection area can be improved, and the sensitivity of stress detection is improved. The detection coils can also adopt a mode that the detection coils with corresponding positions and the same shapes are arranged on a plurality of plate layers of the same circuit board, and the detection coils on different plate layers are connected in series.
The detection coil and the excitation coil are preferably located on different layers of the same circuit board, and when located on the same layer, it is ensured that the detection coil does not intersect the excitation coil.
According to the sensor, the exciting coil is connected with the alternating current, and eddy currents mainly along the directions of three sides of a triangle are generated on a measured structure. Each detection coil is arranged near one side of the triangular excitation coil and detects the magnetic field change information caused by the eddy current. Because the eddy current is influenced by the stress in the metal structure, the eddy currents excited by three sides of the triangular excitation coil are respectively sensitive to the stress change in the direction of each side. The impedance or output signal of the detection coils arranged near each side of the excitation coil reflects the stress information in that direction. The impedance change or the output signal of the detection coils in the three directions is analyzed, and then the partial stress and the linear strain in the three different directions in the metal structure can be detected.
As an embodiment, as shown in fig. 1, the excitation coil of the present invention may be disposed in different layers, for example, the meandering lines of the detection coil 1 and the detection coil 2 are located in one layer, the meandering lines of the detection coil 3 and the detection coil 4 are located in the other layer, and the meandering lines of the detection coil 5 and the detection coil 6 are located in the third layer. The entire triangularly surrounded excitation coil can also be arranged in the same layer.
As shown by the thin solid lines in fig. 1, two detection coils are provided on each side in the present embodiment, one on each of the different sides of the meandering unit. For example, the detection coil 1 and the detection coil 2 are respectively positioned at two sides of a winding unit connected in series, the detection coil 3 and the detection coil 4 are respectively positioned at two sides of the winding unit connected in series, the detection coil 5 and the detection coil 6 are respectively positioned at two sides in the winding unit connected in series, and the detection coil adopts a mode that two rectangular coils formed by winding one wire are connected in series, so that the magnetic field area detected by the detection coil is increased, and the sensitivity of the detection coil is improved.
In the sensor scheme, the induced eddy current energy generated on the measured metal structure by the winding broken line of each side of the triangular surrounding type excitation coil is mainly distributed near the excitation coil, and the eddy current excited by the winding broken line of each side is sensitive to the stress change of each side in the self direction.
The invention also provides a winding method for the eddy current sensor coil, which comprises an excitation coil winding method and a detection coil winding method. For convenience of description, the base of the triangle is set as the x-axis, and the direction perpendicular to the x-axis is set as the y-axis.
The method for winding the exciting coil comprises the following steps:
starting from a starting point S1, winding a meandering line of a side a from outside to inside the triangle in the positive direction of the x-axis, then winding a meandering line of a side B from inside to outside the triangle after turning an angle A, and winding a meandering line of a side c from outside to inside the triangle after turning an angle B; the angle A is the angle between the side a and the side B, and the angle B is the angle between the side B and the side c.
Specifically, as shown in fig. 2, the winding method of the meandering line of the side a is:
(1) starting from a starting point S1, routing a distance D1 in the positive direction of the x axis, then bending the glass substrate counterclockwise by an angle A1 and then routing a distance Dd1 parallel to the side a, and bending the glass substrate counterclockwise by an angle A2 and then routing a distance D2 parallel to the side a; both D1 and D2 are the length of the serpentine cell, and D1 is not less than D2, and Dd1 is the width I of the serpentine cell;
(2) the wiring distance Dd2 is formed after the bending is carried out clockwise by an angle A3, and a serpentine unit is formed; dd1 is the width II of the serpentine element;
(3) after the bending is carried out clockwise by an angle A4, another winding unit is wound;
(4) a plurality of meandering units connected in series to form a meandering line; and the length of the (n + 1) th meandering unit is smaller than the length of the nth meandering unit.
The winding mode of the winding broken line of the side b is as follows:
(1) after the last meandering unit of the side a is wound and turns clockwise by an angle A4, the wire is parallel to the side a and runs a distance D3 in the positive direction of the x axis, the wire turns by the angle A, and winding of the meandering broken line of the side b is started; said distance D3 is not greater than the distance D2 of the last serpentine cell of the serpentine fold of edge a; a is an included angle between the side a and the side b;
(2) the distance D4 is traced parallel to the side b, then the distance Dd1 is traced after being bent clockwise by an angle A5, and the distance D5 is traced parallel to the side b after being bent clockwise by an angle A2; both D4 and D5 are serpentine cell lengths, and distance D5 is no less than distance D4;
(3) the wiring distance Dd2 is formed after the circuit board is bent counterclockwise by an angle A7, and a serpentine unit is formed;
(4) after the bending angle A8 is anticlockwise bent, another winding unit is wound;
(5) a plurality of meandering units connected in series to form a meandering line; and the length of the (n + 1) th meandering unit is longer than that of the nth meandering unit;
the winding manner of the winding line of the side c is as follows:
(1) after the last meandering unit of the side B is wound and rotates anticlockwise by an angle A8, and the wire is parallel to the side B by a routing distance D6, the wire rotates by an angle B, and winding of the meandering broken line of the side c is started; said distance D6 is not less than distance D5 of the last serpentine cell of the serpentine fold line of edge b; the angle B is an included angle between the side B and the side c;
(2) the parallel routing distance D7 with the side c, then the parallel routing distance Dd1 with the side c after bending counterclockwise by an angle A9, and the parallel routing distance D8 with the side c and the reverse routing distance D7 after bending counterclockwise by an angle A10; both D7 and D8 are serpentine cell lengths, and distance D7 is no less than distance D8;
(3) the bent part is bent clockwise by an angle A11 and then is parallel to the edge c by a routing distance Dd2 to form a meandering unit;
(4) after the bending is carried out clockwise by an angle A12, another winding unit is wound;
(5) a plurality of meandering units connected in series to form a meandering line; and the length of the (n + 1) th meandering unit is smaller than the length of the nth meandering unit.
Wherein the absolute values of angle a1, angle A3, angle a6, angle A8, angle a9, angle a11, and 180 degrees are not greater than 90 degrees; and the absolute values of angle a2, angle a4, angle a5, angle a7, angle a10, angle a12, and 180 degrees are not less than 90 degrees.
The winding method of the detection coil is to wind a detection coil in the gaps of the winding units on one side of the winding broken line from the starting position on each side of the triangular excitation coil, or wind a detection coil in the gaps on both sides of the winding units respectively; the detection coil is a meandering line having a certain distance from a meandering line of the excitation coil.
The width I and the width II of the same meandering unit of the exciting coil are the same or different; the detecting coil needs to be arranged in a winding line gap of the exciting coil in a winding mode, so that when one detecting coil is wound in the gap on the same side of at least one winding unit, the width I and the width II of the same winding unit of the detecting coil are different in length so as to ensure that the detecting coil and the exciting coil have a certain distance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the present invention, and these should also be considered as the protection scope of the present invention.
Claims (8)
1. A triangular-surround serpentine eddy current sensor, comprising: the coil assembly comprises a printed circuit board and a coil assembly printed on the printed circuit board;
the coil assembly includes:
an excitation coil wound in a triangle, each side of the triangle including a meandering line parallel to the side, the meandering line being composed of a plurality of meandering units connected in series;
the detection coil is wound in a winding line gap of each side of the excitation coil, and each group of detection coils is wound in at least one winding unit;
triangular exciting coils with corresponding positions and the same shape are arranged on at least two board layers of the printed circuit board, and the exciting coils on different board layers are connected in series;
the detection coils with corresponding positions and the same shape are arranged on at least two plate layers of the printed circuit board, and the detection coils on different plate layers are connected in series;
the excitation coil and the detection coil are positioned on the same slab or different slabs; when located on the same layer, the detection coil does not intersect with the excitation coil;
each group of detection coils at least comprises two independent detection coils, wherein one detection coil is wound in a gap on the same side of the serial winding units, and the other detection coil is wound in a gap on the other side of the serial winding units.
2. A triangular-surround serpentine eddy current sensor in accordance with claim 1, wherein:
the distance between the detection coil wound in the winding unit of each side and the conducting wire forming the winding unit satisfies the following conditions: when the current is applied, the detection coil can detect the eddy current change information excited by the conducting wire forming the winding unit.
3. A triangular-surround serpentine eddy current sensor in accordance with claim 1, wherein:
the detection coils wound on the same side of the winding unit are not less than two, the detection coils in the gaps of the winding unit are all non-closed rectangles, and the at least two detection coils wound on the same side of the winding unit of the same winding broken line are connected in series or respectively connected with external detection equipment.
4. A triangular-surround serpentine eddy current sensor in accordance with claim 1, wherein:
the exciting coil is wound into an equilateral triangle or an isosceles triangle.
5. A method of winding a coil of the delta-wound serpentine eddy current sensor according to any one of claims 1 to 4, wherein: the method comprises an excitation coil winding method and a detection coil winding method; setting the bottom edge of the triangle as an x axis and setting the direction vertical to the x axis as a y axis;
the method for winding the exciting coil comprises the following steps:
starting from a starting point S1, winding a meandering line of a side a from outside to inside the triangle in the positive direction of the x-axis, then winding a meandering line of a side B from inside to outside the triangle after turning an angle A, and winding a meandering line of a side c from outside to inside the triangle after turning an angle B;
the angle A is the included angle between the edge a and the edge B, and the angle B is the included angle between the edge B and the edge c.
6. The coil winding method of a delta-wound serpentine eddy current sensor according to claim 5, wherein:
the winding mode of the winding broken line of the edge a is as follows:
(1) starting from a starting point S1, routing a distance D1 in the positive direction of the x axis, then routing a distance Dd1 after bending the film in the counterclockwise direction by an angle A1, and routing a distance D2 parallel to the edge a after bending the film in the counterclockwise direction by an angle A2; both D1 and D2 are the length of the serpentine cell, and D1 is not less than D2, and Dd1 is the width I of the serpentine cell;
(2) the wiring distance Dd2 is formed after the bending is carried out clockwise by an angle A3, and a serpentine unit is formed; dd2 is the width II of the serpentine element;
(3) after the bending is carried out clockwise by an angle A4, another winding unit is wound;
(4) a plurality of meandering units connected in series to form a meandering line; and the length of the (n + 1) th meandering unit is shorter than the length of the nth meandering unit;
the winding mode of the winding broken line of the side b is as follows:
(1) after the last meandering unit of the side a is wound and turns clockwise by an angle A4, the wire is parallel to the side a and runs a distance D3 in the positive direction of the x axis, the wire turns by the angle A, and winding of the meandering broken line of the side b is started; said distance D3 is not greater than the distance D2 of the last serpentine cell of the serpentine fold of edge a;
(2) the distance D4 is traced parallel to the side b, then the distance Dd1 is traced after being bent clockwise by an angle A5, and the distance D5 is traced parallel to the side b after being bent clockwise by an angle A6; both D4 and D5 are serpentine cell lengths, and distance D5 is no less than distance D4;
(3) the wiring distance Dd2 is formed after the circuit board is bent counterclockwise by an angle A7, and a serpentine unit is formed;
(4) after the bending angle A8 is anticlockwise bent, another winding unit is wound;
(5) a plurality of meandering units connected in series to form a meandering line; and the length of the (n + 1) th meandering unit is longer than the length of the nth meandering unit;
the winding mode of the winding broken line of the edge c is as follows:
(1) after the last meandering unit of the side B is wound and rotates anticlockwise by an angle A8, and the wire is parallel to the side B by a routing distance D6, the wire rotates by an angle B, and winding of the meandering broken line of the side c is started; said distance D6 is not less than distance D5 of the last serpentine cell of the serpentine fold line of edge b;
(2) a routing distance D7 parallel to the side c, a routing distance Dd1 after being bent counterclockwise by an angle A9, and a routing distance D8 parallel to the side c and opposite to the D7 after being bent counterclockwise by an angle A10; both D7 and D8 are serpentine cell lengths, and distance D7 is no less than distance D8;
(3) the wiring distance Dd2 is formed after the bending is carried out clockwise by an angle A11, and a serpentine unit is formed;
(4) after the bending is carried out clockwise by an angle A12, another winding unit is wound;
(5) a plurality of meandering units connected in series to form a meandering line; and the length of the (n + 1) th meandering unit is shorter than the length of the nth meandering unit;
wherein the absolute values of angle a1, angle A3, angle a6, angle A8, angle a9, angle a11, and 180 degrees are not greater than 90 degrees; and the absolute values of angle a2, angle a4, angle a5, angle a7, angle a10, angle a12, and 180 degrees are not less than 90 degrees.
7. The method of winding a coil for a delta-wound serpentine eddy current sensor according to claim 6, wherein:
the detection coil winding method comprises the following steps:
winding a detection coil in the gaps of the meandering units on one side of the meandering line from the starting position on each side of the excitation coil, or respectively winding a detection coil in the gaps on both sides of the meandering units; the detection coil is a meandering line having a certain distance from a meandering line of the excitation coil.
8. The coil winding method of a delta-wound serpentine eddy current sensor according to claim 5, wherein:
the width I and the width II of the same meandering unit of the exciting coil are the same or different; when a detection coil is wound in the gap on the same side of at least one winding unit, the width I and the width II of the same winding unit of the detection coil are different.
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