A kind of permanent magnet motor magnet and preparation method thereof

Abstract

The invention relates to the technical field of rare earth magnetic materials, in particular to a permanent magnet motor magnet and a preparation method thereof. The invention provides the permanent magnet motor magnet, and the magnet comprises more than two neodymium iron boron magnetic sheets, wherein a bonding layer is arranged between the adjacent neodymium iron boron magnetic sheets, ceramsite sand is distributed in the bonding layers, the particle size of the ceramsite sand is 0.09-0.25 mm, and the roundness is more than 0.7. According to the invention, the ceramsite sand is used as a supporting frame between the adjacent neodymium iron boron magnetic sheets, thereby facilitating the improvement of the uniformity of the high-temperature-resistant insulating glue between the neodymium iron boron magnetic sheets, and avoiding bubbles. The bonding force and insulation consistency between the neodymium-iron-boron magnetic sheets and the magnetic sheets are improved by the cooperation with the insulation and bonding effects of high-temperature-resistant insulation paste, then the overall insulativity and reliability of the permanent magnet motor magnet are improved, internal eddy current heating of the magnet during working can be reduced, and the using temperature of the magnet is increased.

Description

technical field [0001] The invention relates to the technical field of rare earth magnetic materials, in particular to a permanent magnet motor magnet and a preparation method thereof. Background technique [0002] The application range of permanent magnet motors is getting wider and wider, and the frequency and speed of the motors are getting higher and higher during use. However, the permanent magnet materials used in permanent magnet motors have high resistance. Working for a long time under high frequency conditions will lead to high temperature of the magnets, which will affect the magnetic properties of the magnets, and even lead to a large irreversible demagnetization of the magnetic properties, which will bring belts to the motor. serious risks and hazards. [0003] Chinese patent CN201610356080.3 discloses a production method for permanent magnet motor magnets that reduces eddy current heating. The magnets are split, and the magnets are connected by an insulating a...

AI Technical Summary

Problems solved by technology

However, the permanent magnet materials used in permanent magnet motors have high resistance. Working for a long time under high frequency conditions will lead to high temperature of the magnets, which will affect the magnetic properties of the magnets, and even lead to a large irreversible demagnetization of the magnetic properties, which will bring belts to the motor. serious risks and hidden dangers

[0003] Chinese patent CN201610356080.3 discloses a production method for permanent magnet motor magnets that reduces eddy current heating. The magnets are split, and the magnets are connected by an insulating and high-temperature resistant adhesive to form a magnet. However, it is difficult to ensure the uniformity of the adhesive during the curing process. Adhesive insulation effect is difficult to meet actual needs

[0004] "Insulation Control Elements in the Bonding Process of NdFeB Magnets" (Yu Yongjiang et al., "Bonding") proposed the method of first cutting the magnet into multiple pieces and then bonding them with insulating glue. Quartz sand with a certain particle size is mixed into the glue to improve the bonding and insulating effect, but the strength of the quartz sand is poor, and the edges and corners are sharp, and air bubbles will be generated during the mixing process with the insulating glue, which will affect the bonding effect, and the insulating effect is still poor.

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