Concentric orthogonal three-component coil arrangement

Abstract

The application discloses a concentric orthogonal three-component coil device, and is characterized in that two same-size elliptical coils and a right circular coil are arranged; the two elliptical coils and the right circular coil are orthogonal to each other, the centers of the three coils are located at the same geometric center, and the effective areas of the two elliptical coils and the effective area of the right circular coil are equal. The application has the beneficial effects that the large deviation influence caused by the fact that the current three-component coil device cannot be concentric and orthogonal is solved, and the detection accuracy of the spatial magnetic induction intensity variation is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coil sensor, in particular to the technical field of concentric orthogonal three-component coil device. BACKGROUND

[0002] The coil device is a sensor device for sensing the change of magnetic field in space, which is widely used in the monitoring and detection of power system grounding grid, and in the nondestructive testing and quality control in the industrial field. The design and application of the coil device can be different due to the required detection accuracy, environmental conditions and the characteristics of the measured metal. In general, the coil device plays a crucial role in industry and power system, which helps to ensure the quality and safety of metal materials.

[0003] The traditional three-component coil device cannot construct three single-component coil devices with the same area as a concentric orthogonal device due to size space limitations, that is, the induced voltage vector sum of the three component coils is significantly different from the actual measured point magnetic field change vector sum. Further, when the traditional three-component coil device is rotated, the induced voltage vector sum measurement value is also deviated from the actual value, thereby affecting the accuracy of the measurement signal and causing interference to the subsequent data interpretation and imaging accuracy.

[0004] Disadvantages: large measurement error, low accuracy of detection signal. SUMMARY

[0005] The purpose of the present application is to provide a concentric orthogonal three-component coil device that can reduce measurement error and improve the accuracy of detection signal.

[0006] A concentric orthogonal three-component coil device, the key is to provide two identical size elliptical coils and a circular coil;

[0007] The two elliptical coils and the circular coil are orthogonal to each other, and the centers of the three coils are located at the same geometric center.

[0008] The effective area of the two elliptical coils and the effective area of the circular coil are equal.

[0009] The concentric orthogonal three-component coil device has the same equivalent area in xyz coordinate components, and the number of turns of the coil is the same. The geometric center position of the concentric orthogonal three-component coil is used as the coil position to move in space to measure the size of the spatial magnetic field change, which can reduce the measurement error and improve the accuracy of the detection signal.

[0010] The parameters of the two elliptical coils and the circular coil are defined as follows:

[0011]

[0012] wherein, R is the outer wall radius of the inner circle of the circular coil, a is the long axis of the elliptical coil, b is the short axis of the elliptical coil, W is the inner width of the groove, t is the wall thickness of the groove.

[0013] The parameters that the effective area of the two elliptical coils and the effective area of the circular coil are equal are defined as follows:

[0014] ;

[0015] wherein, e is the set error, Ae is the given area error;

[0016] The given area error Ae is:

[0017] ;

[0018] wherein, A is the winding layer area of the circular coil, Ae is the winding layer area of the elliptical coil, a is the long axis of the elliptical coil, b is the short axis of the elliptical coil.

[0019] In combination with the parameter definition of the orthogonal coils and the parameter definition of the equal effective area of the coils, and introducing the manufacturing error, the complete parameter definition of the concentric orthogonal three-component coil device is as follows:

[0020]

[0021] wherein, R is the outer wall radius of the inner circle of the circular coil, a is the long axis of the elliptical coil, b is the short axis of the elliptical coil, W is the inner width of the groove, t is the wall thickness of the groove, e is the manufacturing error.

[0022] Beneficial effects: It solves the problem that the three-component coil device cannot be concentrically orthogonal, which brings a large deviation to the measurement value, and improves the detection accuracy of the spatial magnetic induction intensity variation. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 are three views of the elliptical coil and the circular coil;

[0024] Figure 2 are orthogonal three views of the elliptical coil; ​

[0025] Figure 3 For the ellipse coil and the normal circle coil two two orthogonal three view;

[0026] Figure 4 Traditional three-component coil and ideal model schematic diagram;

[0027] Figure 5 For the magnetic dipole in space to produce magnetic field schematic diagram;

[0028] Figure 6 For space three-component induced voltage error comparison chart. DETAILED DESCRIPTION

[0029] The specific embodiments of the application and the working principle will be further described in detail below with reference to the accompanying drawings.

[0030] As Figure 1 The concentric orthogonal three-component coil device is provided with two identical size ellipse coils and a normal circle coil;

[0031] The winding skeleton of the ellipse coil and the normal circle coil is a hollow concave structure, and the coil wire can be wound in the groove;

[0032] The ellipse coil takes the center point as the coordinate origin, and the ellipse parameters of the inner wall of the winding layer of the ellipse coil can be represented as:

[0033]

[0034] Among them, is the long axis of the ellipse coil, is the short axis of the ellipse coil;

[0035] The ellipse parameters of the inner wall of the inner circle of the winding layer of the ellipse coil can be represented as:

[0036]

[0037] Among them, is the long axis of the ellipse coil, is the short axis of the ellipse coil, is the groove wall thickness.

[0038] As Figure 2 The two ellipse coils are orthogonal, and the center points of the two ellipse coils are located at the same geometric center, forming a concentric orthogonal two-component orthogonal coil combination; The concentric orthogonal two-component orthogonal coil combination satisfies the following equation:

[0039]

[0040] Among them, is the long axis of the ellipse coil, The minor axis of the elliptical coil The inner width of the groove, The thickness is the wall thickness of the groove.

[0041] like Figure 3 As shown, the two elliptical coils and the circular coil intersect each other pairwise, and the center points of the two elliptical coils and the circular coil are all located at the same geometric center, forming a concentric orthogonal three-component orthogonal coil device. This concentric orthogonal three-component orthogonal coil device satisfies the following system of equations:

[0042]

[0043] in, The radius of the outer wall of the inner coil of the circular coil is _____. The major axis of the elliptical coil The minor axis of the elliptical coil The inner width of the groove, The thickness is the wall thickness of the groove.

[0044] If manufacturing errors are taken into account, the above system of equations is as follows:

[0045]

[0046] in, The radius of the outer wall of the inner coil of the circular coil is _____. The major axis of the elliptical coil The minor axis of the elliptical coil The inner width of the groove, For the groove wall thickness, This is due to manufacturing errors.

[0047] At the same time, the effective areas of the two elliptical coils and the circular coil should be equal, so the following limiting conditions are satisfied:

[0048] ;

[0049] in, To set the error, Given the area error;

[0050] The given area error for:

[0051] ;

[0052] in, The area of ​​the winding layer of the circular coil. The area of ​​the elliptical coil winding layer. The major axis of the elliptical coil It is the minor axis of the elliptical coil.

[0053] Considering the limitations of location and area, the final concentric orthogonal three-component coil device satisfies the following set of equations:

[0054]

[0055] in, The radius of the outer wall of the inner coil of the circular coil is _____. The major axis of the elliptical coil The minor axis of the elliptical coil The inner width of the groove, For the groove wall thickness, This is due to manufacturing errors.

[0056] The major axis of the elliptical coil can be determined using the above system of equations. elliptical coil minor axis And the outer radius of the inner circle of the circular coil The parameter size allows for the fabrication of the concentric orthogonal three-component coil device.

[0057] like Figure 4 As shown, (a) is a model of the cubic three-component coil device, (b) is a model of the concentric orthogonal three-component coil device, (c) is an ideal model of the cubic three-component coil device, and (d) is an ideal model of the concentric orthogonal three-component coil device. The cubic three-component coil device and the concentric orthogonal three-component coil device have the same equivalent area in the xyz coordinate components and the same number of coil turns. The geometric center positions of the cubic three-component coil device and the concentric orthogonal three-component coil device are taken as the coil positions, and they are placed in the same magnetic field for numerical simulation.

[0058] like Figure 5 As shown, the magnetic field excitation source is configured as a magnetic dipole located at the center of a circle in the Cartesian coordinate system, and as... Figure 4 A measuring line (y=0, z=1) is arranged as shown. The cube-shaped three-component coil device and the concentric orthogonal three-component coil device measure and collect the amplitude of the spatial electromagnetic induction voltage along this measuring line. By defining an error, we can compare its ability to perceive changes in the spatial magnetic field.

[0059] The defined error is:

[0060]

[0061] like Figure 6As shown, when the cube three-component coil device and the concentric orthogonal three-component coil device move horizontally along the measuring line, the maximum definition error (Error) measured by the cube coil device is 4.69%, while the maximum definition error (Error) measured by the concentric orthogonal three-component coil device is only 0.31%.

[0062] Meanwhile, the spatial induced voltage performance of the concentric orthogonal three-component coil device is superior to that of the cube coil device. This is because the measurement error of the three components of the cube coil mainly comes from the two symmetrical square coils corresponding to the three components. In high-precision magnetic field change measurement, the magnetic field does not change linearly along a certain direction, which causes the average value of the induced voltage of the symmetrical square coil to be not the induced voltage at the geometric center. However, since the concentric orthogonal three-component coil device is a concentric device structure, the three component induced voltages are sensed by a single coil device, so its horizontal measurement accuracy is high.

Claims

1. A concentric orthogonal three-component coil device, characterized in that, Set up two elliptical coils and one circular coil of the same size; The two elliptical coils and the circular coil are orthogonal to each other, and the centers of the three coils are all located at the same geometric center; The parameters for the pairwise orthogonality of the two elliptical coils and the circular coil are defined as follows: ， in, The radius of the outer wall of the inner coil of the circular coil is _____. The major axis of the elliptical coil The minor axis of the elliptical coil The inner width of the groove, The thickness of the groove wall; The parameter that the effective areas of the two elliptical coils are equal to the effective area of ​​the circular coil is defined as follows: ； in, To set the error, Given the area error; The given area error for: ； in, The area of ​​the winding layer of the circular coil. The area of ​​the elliptical coil winding layer. The major axis of the elliptical coil The minor axis of the elliptical coil; Combining the parameter constraints of pairwise orthogonality of the coils and equal effective area of ​​the coils, and introducing manufacturing errors, the complete parameter constraints of the concentric orthogonal three-component coil device are as follows: ， in, The radius of the outer wall of the inner coil of the circular coil is _____. The major axis of the elliptical coil The minor axis of the elliptical coil The inner width of the groove, For the groove wall thickness, This is due to manufacturing errors.

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