Method for quickly identifying magnetization direction of sintered rare earth permanent magnet

Abstract

The invention discloses a method for quickly identifying the magnetization direction of a sintered rare earth permanent magnet, which is characterized by comprising the following steps of: preparing amagnetized cylindrical magnet according to the uniqueness and easy magnetization principle of the magnetization direction of the sintered rare earth permanent magnet, and marking the magnetization directions of an N pole and an S pole on the two end surfaces of the cylindrical magnet; and vertically placing the outer circle of the cylindrical magnet on the non-magnetized surface of the measured magnet, wherein the non-magnetized surface of the measured magnet is in a horizontal state, the cylindrical magnet can rotate to be consistent with the magnetization direction of the measured magnet under the action of force in the magnetic field direction, and the directions of the two poles of the cylindrical magnet are the magnetization direction of the measured magnet. The method has the absolute advantages that the operation is simple, the efficiency is high, the implementation cost is low, the magnetic pole orientation is identified accurately, weak magnetism on the measured magnet is notcaused, the method is not influenced by the shape of the measured magnet, and the like, and for enterprises, the practicability is very high and is incomparable to the traditional identification mode.

Description

technical field [0001] The invention relates to the field of magnetic pole identification technology, in particular to a method for quickly identifying the magnetization direction of a sintered rare earth permanent magnet. Background technique [0002] Sintered rare earth permanent magnets are more and more widely used in modern industry. As the advantages of Halbach magnetic arrays are rapidly excavated and promoted in the fields of motors, tablet computers, and magnetization, more and more products with complex shapes and oblique magnetization are being used Developed to correspond to the production of more and more obliquely oriented blanks, a simple and effective operation method is increasingly required in production processing and quality inspection, which can quickly and accurately identify its magnetization direction. There are two existing methods of operation. One is to use magnetized magnets to absorb the various appearance surfaces of the magnet to be detected to...

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Problems solved by technology

[0003] The method of using a magnetized magnet to absorb each surface of the magnet under test, the suction force is perpendicular to the adsorption surface, which is greatly affected by the shape of the magnet and the adsorption friction force, the test method itself determines which adsorption surface can only be roughly confirmed The suction force is the largest, which is of no help to confirm the direction of oblique magnetization, and it is easy to cause weak magnetic field on the magnet under test, which will affect subsequent use

[0004] The method of magnetizing the magnet to be tested is to use a magnetic display sheet attached to the non-magnetized surface to observe its magnetic pole image, which is greatly affected by the shape of the magnet to be tested, and the magnetic pole dividing line at the edge will be distorted, resulting in a large measurement error

Using the three-dimensional Helmholtz coil measurement can accurately measure the magnetization direction and magnetization angle, but the semi-finished products and blanks after magnetization need to be demagnetized, otherwise they cannot be used, and improper demagnetization operation will easily cause the substrate to oxidize, which determines the method of magnetization test operation It is cumbersome and not easy to promote, and cannot meet the principle of simple, effective and easy to operate (for mass-produced sintered permanent magnets, the complicated operation makes the recognition process line take too long and the efficiency is too low)

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