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Powerful magnets is how to make out

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A drive motor for hybrid and electric vehicles, the Nd-Fe-B sintered magnet (neodymium - iron - boron) is an essential key member. Compared with the other magnet, neodymium magnet is not only a strong magnetic force, can achieve high power sufficient to drive the vehicle, but also, the motor can be reduced to a size suitable for a vehicle application.
Well, you know this NdFeB magnets is how to make out? It requires first containing the necessary material alloy is pulverized into fine particles, these particles together forming, and then sintered. Then cut to the desired size in order to complete. This process always feel like making a cake.
Of course, in the actual production of high quality NdFeB magnets is not so simple. Not only to the fine particle size of unified 3 ~ 5μm, but also pay attention to the uniformity in the shape, but also consider the sintering heating method, the need to spend a lot of effort to manufacture. By massive accumulation of small technology to reach today's practical level "(technical staff) in the development of neodymium magnets.
For example, the alloy is crushed to 3 to 5μm magnetic field forming process "is one of them. This step is to allow the orientation of a fine powder after pulverization (micro-magnets). The place orientation refers to the direction of magnetization of the micronized unified in a fixed direction, the higher the orientation, the greater the residual magnetic flux density (magnetic field strength indicator). The first embodiment this step micronized filled into a mold, applying a strong magnetic field on the micronized alignment, then the implementation of the pressure molding process. Which is unique in that the gentle pressure molding to the extent of the molded body does not collapse. Because the pressure is too large, then it will disrupt the hard-won unity of micronized orientation.
In order to achieve high alignment needed to create a uniform magnetic field space inside the mold, which is also very important. Due to the configuration of the electromagnet and the mold size, shape and material are the magnetic field is uneven, resulting in the deterioration of orientation, and therefore require the use of a magnetic field analysis by means of trimming, so that the magnetic field uniformity.

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