CN103983924A - Method for measuring magnetic induction intensity of two-dimensional magnetic field - Google Patents

Abstract

Provided is a method for measuring the magnetic induction intensity of a two-dimensional magnetic field. Two magnetism measuring coils are bonded to a center cubic body through an adhesive in the x direction and the y direction respectively. When a magnetism measuring element is used for measuring the magnetic induction intensity of a certain position, the induction potentials and frequencies of the two magnetism measuring coils in the x direction and the y direction are measured, and the magnetic induction intensity of the point position in the x direction and the y direction and the amplitude value and phase position of a magnetic induction intensity vector of the point position are finally determined through calculation by means of formulas (1), (2), (3) and (4).

Description

The method of test two-dimensional magnetic field magnetic induction density

Technical field:

The present invention relates to a kind of method of testing two-dimensional magnetic field magnetic induction density.

Background technology:

Along with developing rapidly of generator industry, the capacity of air-cooled steam turbine generator is improving constantly, and the stator core limit section that high-rating generator end magnetic field causes and the heating problem of end construction part have become the key factor that jeopardizes the normal operation of generator.Magnetic induction density is the fundamental physical quantity of magnetic field properties, the high or low heating that is directly connected to structural member of magnetic induction density.Therefore all significant in production and scientific research for the testing research in magnetic field, generator end.Two-dimensional magnetic field magnetic induction density test is at present still more difficult, and the method in existing measurement magnetic field, is mainly with hall probe and special-purpose testing tool, to come the magnetic field of measurement space point.First traditional hall probe complex manufacturing technology, requires strictly measuring system, and cost is high; Test when next is not suitable for motor internal multiple spot magnetic field.At present, the two-dimensional magnetic field magnetic induction density that the volume of applicable End Magnetic Field of Air-Cooled Turbogenerator test is little is surveyed magnetic cell also not to be had.

Summary of the invention:

The object of the invention is to disclose a kind of method of testing two-dimensional magnetic field magnetic induction density, by using this survey magnetic cell, reach the object of measuring two-dimensional magnetic field magnetic induction density.Technical scheme of the present invention is: a kind of method of testing two-dimensional magnetic field magnetic induction density, middle body-centred cube (1), x direction skeleton (2), y direction skeleton (3), x direction coil (4) and y direction coil (5), surveying magnetic cell full-size is 4mm * 6.5mm * 6.5mm, middle body-centred cube and 2 skeletons are respectively equipped with location taper hole taper pin, for locating 2 magentic test coils of x and y direction, with bakelite, manufacture the skeleton of 1 middle body-centred cube and 2 coilings, with the enameled wire of the Φ 0.05mm coil of 2 of coiling x direction and y direction each 400 circles on 2 skeletons respectively, after coil winding completes, it is demarcated, 2 coils that obtain x direction and y direction are demarcated constant (C _x, C _y), it is the product of the number of turn and equivalent area that coil is demarcated constant, 2 skeletons that wind magentic test coil are bonded in respectively to the cubical x direction in center and y direction with J39 glue, when using this survey magnetic cell to measure the magnetic induction density of certain some position, by testing induced potential and the frequency of 2 magentic test coils of x direction and y direction, press formula (1), (2), (3), (4) calculating final amplitude and the phase place of determining the magnetic flux density vector of the x direction of this position and the magnetic induction density of y direction and this position, magnetic induction density calculates formula and is:

$\mathrm{Bx}=\frac{\mathrm{Ux}}{4.44\·f\·\mathrm{Cx}},T---\left(1\right)$

$\mathrm{By}=\frac{\mathrm{Uy}}{4.44\·f\·\mathrm{Cy}},T---\left(2\right)$

In formula:

B _x---be x direction magnetic induction density, (T);

U _x---be the induced potential of x direction magentic test coil, (V);

F---be frequency, (Hz);

C _x---be the demarcation constant of x direction magentic test coil, (m ²);

B _y---be y direction magnetic induction density, (T);

U _y---be the induced potential of y direction magentic test coil, (V);

C _y---be the demarcation constant of y direction magentic test coil, (m ²);

The amplitude of magnetic flux density vector and phase place:

$B=\sqrt{{B_x}^2+{B_y}^2},T---\left(3\right)$

$\left.\begin{array}{c}{\mathrm{\φ}}_x=\arccos \left(\frac{B_x}{B}\right),T\\ {\mathrm{\φ}}_y=\arccos \left(\frac{B_y}{B}\right),T\end{array}\right\}---\left(4\right)$

In formula:

B---be the amplitude of magnetic flux density vector, (T);

φ _x---be the angle of magnetic flux density vector and x axle, (°);

φ _y---be the angle of magnetic flux density vector and y axle, (°).

Technique effect:

Traditional magnetic field measuring device adopts Hall element to be placed on probe front end Mou Dian magnetic field, space is surveyed.The method is applicable to the magnetic field size on point of fixity of space exploration, test when not being suitable for motor internal multiple spot magnetic field.

The present invention is directed to traditional magnetic field measuring device and be not suitable for the problem that multiple spot magnetic field is tested simultaneously, provide a kind of survey magnetic cell volume little, full-size is only 4mm * 6.5mm * 6.5mm; Manufacture technology is simple, cost is low, the middle body-centred cube that survey magnetic cell employing bakelite is manufactured and the skeleton of two coiling magentic test coils; Band locating taper pin, has improved x direction and y direction positioning precision; Survey magnetic cell and can be bonded in the position that motor internal will be measured magnetic field, be applicable to the test in motor internal multiple spot magnetic field.Can measure two-dimensional magnetic field x direction and the magnetic induction density of y direction and the amplitude of magnetic flux density vector and phase place; Be applicable to the test in magnetic field, generator end and other field two-dimensional magnetic field test etc.

Compared with prior art, its beneficial effect is embodied in following several respects in the present invention: 1) manufacture technology is simple, cost is low, the middle body-centred cube that employing bakelite is manufactured and the skeleton of two coiling magentic test coils; 2) be applicable to the test in motor internal multiple spot magnetic field, survey magnetic cell and can be bonded in the position that motor internal will be measured magnetic field; 3) use conventional multimeter by the induced potential of test magentic test coil, can complete the survey magnetic task in multiple spot magnetic field.

Accompanying drawing explanation:

Fig. 1: two-dimensional magnetic field magnetic induction density is surveyed magnetic cell structural drawing.

Embodiment:

As shown in Figure 1, two-dimensional magnetic field magnetic induction density is surveyed the structural drawing of magnetic cell.With bakelite, manufacture 1 middle body-centred cube, the cubical x in center and y direction center are respectively equipped with location taper hole, with bakelite, manufacture again the skeleton of 2 coiling band locating taper pins, skeleton is provided with locating taper pin, for locating 2 magentic test coils of x and y direction, with the enameled wire of the Φ 0.05mm coil of 2 each 400 circles of coiling on 2 skeletons respectively, both x direction and y direction magentic test coil, after coil winding completes, it is demarcated, magentic test coil is placed into the demarcation region of known constant standard Magnetic Field, use FM-1 type magnetic flux integrator to demarcate it, 2 coils that obtain respectively x direction and y direction are demarcated constant (C _x, C _y), it is the product of the number of turn and equivalent area that coil is demarcated constant, the locating taper pin of having demarcated 2 skeletons of magentic test coil is aimed at cubical location, center taper hole, with J39 glue, be bonded in respectively the cubical x direction in center and y direction, when using this survey magnetic cell to measure the magnetic induction density of certain some position, by testing induced potential and the frequency of 2 magentic test coils of x direction and y direction, press formula (1), (2), (3), (4) calculate and finally determine amplitude and the phase place of the magnetic flux density vector of the x direction of this position and the magnetic induction density of y direction and this position.

Claims (2)

1. a method of testing two-dimensional magnetic field magnetic induction density, it is characterized in that: middle body-centred cube (1), x direction skeleton (2), y direction skeleton (3), x direction coil (4) and y direction coil (5), middle body-centred cube and two skeletons are respectively equipped with location taper hole taper pin, for locating two magentic test coils of x and y direction, with bakelite, manufacture the skeleton of a middle body-centred cube and two coilings, with the enameled wire of the Φ 0.05mm coil of two of coiling x direction and y direction each 400 circles on two skeletons respectively, after coil winding completes, it is demarcated, two coils that obtain x direction and y direction are demarcated constant C _x, C _yit is the product of the number of turn and equivalent area that coil is demarcated constant, two skeletons that wind magentic test coil are bonded in respectively to the cubical x direction in center and y direction with J39 glue, when using this survey magnetic cell to measure the magnetic induction density of certain some position, by testing induced potential and the frequency of two magentic test coils of x direction and y direction, press formula (1), (2), (3), (4) calculating final amplitude and the phase place of determining the magnetic flux density vector of the x direction of this position and the magnetic induction density of y direction and this position, magnetic induction density calculates formula and is:

$\mathrm{Bx}=\frac{\mathrm{Ux}}{4.44\·f\·\mathrm{Cx}},T---\left(1\right)$

$\mathrm{By}=\frac{\mathrm{Uy}}{4.44\·f\·\mathrm{Cy}},T---\left(2\right)$

In formula:

B _x---be x direction magnetic induction density, (T);

U _x---be the induced potential of x direction magentic test coil, (V);

F---be frequency, (Hz);

C _x---be the demarcation constant of x direction magentic test coil, (m ²);

B _y---be y direction magnetic induction density, (T);

U _y---be the induced potential of y direction magentic test coil, (V);

C _y---be the demarcation constant of y direction magentic test coil, (m ²);

The amplitude of magnetic flux density vector and phase place:

$B=\sqrt{{B_x}^2+{B_y}^2},T---\left(3\right)$

$\left.\begin{array}{c}{\mathrm{\φ}}_x=\arccos \left(\frac{B_x}{B}\right),T\\ {\mathrm{\φ}}_y=\arccos \left(\frac{B_y}{B}\right),T\end{array}\right\}---\left(4\right)$

In formula:

B---be the amplitude of magnetic flux density vector, (T);

φ _x---be the angle of magnetic flux density vector and x axle, (°);

φ _y---be the angle of magnetic flux density vector and y axle, (°).

2. a kind of method of testing two-dimensional magnetic field magnetic induction density according to claim 1, is characterized in that: described survey magnetic cell full-size is 4mm * 6.5mm * 6.5mm.