Nondestructive measurement system and method for magnetic tile based on double integration method of embedded coils

Abstract

The invention discloses a nondestructive measurement system and method for a magnetic tile based on a double integration method of embedded coils. A first measuring coil and a second measuring coil are embedded in a lower pole shoe along a horizontal axial direction; a to-be-measured magnetic tile is positioned on the first measuring coil; two sides of upper and lower pole heads are connected through an elastic movable structure so as to realize adjusting of upper and lower elastic forces; the arc surfaces of upper and lower pole shoes both match with the radian of the to-be-measured magnetic tile; the first and second measuring coils are connected with a respective magnetic flux meter; electromagnets are connected with an excitation power supply; the excitation power supply and the magnetic flux meters are respectively connected with a computer through a D / A converter and an A / D converter; and a switch controller is connected with the D / A converter and the A / D converter so as to realize control of a change-over switch. According to the invention, an elastic force-guided opening-closing pole shoe structure is employed, so sample replacing efficiency is improved, and demands in testing of a rare earth permanent magnetic tile by using a pull out procedure are met; and good measurement repeatability and reproducibility are obtained, and human errors are few.

Description

technical field [0001] The invention relates to the technical field of magnetic performance testing of magnetic materials, in particular to a system and method for nondestructive measurement of magnetic tiles based on embedded coil double integration method, which can be used for nondestructive measurement of magnetic properties of permanent ferrite, NdFeB and other magnetic tiles And the calibration and verification of relevant reference materials. Background technique [0002] The magnetic properties of permanent magnet materials are mainly obtained by measuring the demagnetization relationship curve between the magnetic induction B and polarization J of the material in the second quadrant and the magnetic field H to obtain the remanence B r , coercive force H cB , Intrinsic coercive force H cJ , Maximum energy product (BH) max And other characteristic parameters to characterize. Among them, the J-H curve is an important curve that highlights the intrinsic properties o...

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Problems solved by technology

[0003] The existing technology adopts standard bipolar head measurement or measurement by magnetic tile fixture, such as figure 2 and image 3 As shown, the B coil is used to test the magnetic flux, and the Gauss meter is used to configure the Hall probe 9 to test the gap magnetic field H. The main disadvantages are: the randomness of the magnetic flux area correction, the magnetic tile pair data transmitted by the enterprise, and the position of the Hall probe. The test H data is different, which greatly affects the performance of Hcj; the gap between test samples is fixed, and it is very difficult to take and place samples, which cannot meet the throwing measurement of domestic rare earth magnetic tiles, and the test of rare earth permanent magnet tiles is still blank; The difference is large, and the gap magnetic field cannot be designed

[0004] The fixed winding coil 8 and the pole head are separate structures. The position of the H coil or the Hall probe in the pole piece gap is different, and the test H varies greatly, making it difficult to guarantee the repeatability of the test.

[0005] The tile-type non-destructive measurement system is limited to the measurement of the permanent magnet ferrite tiles with close inner and outer arcs by scanning method, which cannot meet the measurement of magnetic tile samples with large differences between the inner and outer arcs. Can not meet the requirements of magnetic tile throwing when measuring the demagnetization curve of rare earth permanent magnet tiles

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