Composite magnetic steel
A technology of magnetic steel and magnetic steel body, applied in the shape/style/structure of magnetic circuit, magnetic circuit characterized by insulating materials, etc. The effect of surface eddy current loss, improving anti-vibration ability, and avoiding adverse effects
Active Publication Date: 2012-08-08
江西江特电机有限公司
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Problems solved by technology
However, as a permanent magnet material itself, there are still certain defects, which are mainly manifested in the following aspects: one is the positive temperature coefficient, and its magnetic properties decrease with the increase of temperature; the other is relatively brittle, and it is easily damaged by large vibrations , which is especially obvious in the application of high-speed motors; the third is that it is easy to rust and cause loss of magnetism. For this reason, NdFeB permanent magnets are usually galvanized or chrome-plated, but for built-in permanent magnets, when inserted into the rotor core It is easy to damage the surface coating of the permanent magnet and still cause the permanent magnet to rust; the fourth is that the impact of high current can easily cause the permanent magnet to lose its magnetism. Therefore, it is necessary to carry out targeted treatment when the permanent magnet is inserted into the magnetic steel.
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[0013] The present invention will be further described through embodiment now in conjunction with accompanying drawing. As shown in the figure, the magnetic steel body 1 of the composite magnetic steel is composed of NdFeB magnetic steel 2, a layer of imide film 3 as a buffer layer, and a layer of steel plate 4 as a metal material layer; the imide film 3 Paste and be connected to the surface 2a of the magnetization direction of the NdFeB magnet 2 and one side surface of the steel plate 4 respectively by glue from its opposite two side surfaces; The size and shape of the surface of the steel 2 in the direction of magnetization correspond; the thickness of the imide film 3 is 0.05 mm, and the thickness of the thin steel plate is 0.35 mm.
[0014] The buffer layer of the present invention can be made of an insulating material with a temperature resistance greater than 100°C, or an insulating material with a certain degree of elasticity with a temperature resistance greater than 1...
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Abstract
The invention discloses a composite magnetic steel which is simple in installation and protection, low in eddy current loss and more excellent in magnetic performance. The composite magnetic steel comprises a magnetic steel body formed by connecting a NdFeB magnetic steel with a steel plate layer arranged on a surface of the NdFeB magnetic steel; and an imine thin film layer is formed between thesteel plate and a surface of the NdFeB magnetic steel in a magnetizing direction.
Description
Technical field: [0001] The invention relates to a motor, in particular to a composite magnetic steel used for the motor. Background technique: [0002] Due to its continuous improvement in recent years, NdFeB has more excellent magnetic properties, especially its strong magnetic field strength, high coercive force, and high temperature resistance, so it is widely used in permanent magnet motors. However, as a permanent magnet material itself, there are still certain defects, which are mainly manifested in the following aspects: one is the positive temperature coefficient, and its magnetic properties decrease with the increase of temperature; the other is relatively brittle, and it is easily damaged by large vibrations , which is especially obvious in the application of high-speed motors; the third is that it is easy to rust and cause loss of magnetism. For this reason, NdFeB permanent magnets are usually galvanized or chrome-plated, but for built-in permanent magnets, when ...
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IPC IPC(8): H02K1/06H02K1/04
Inventor 王卫平吴冬英
Owner 江西江特电机有限公司