Talk about the magnetic coercivity of the magnet

- Nov 23, 2017 -

NdFeB magnet is currently widely used, the rapid development of magnets products. NdFeB from invention to now a wide range of applications, but also more than 20 years time. Magnet companies are rapidly expanding their applications due to their low cost and high magnetic properties and ease of processing. At present, the commercial neodymium iron boron, magnetic energy product can reach 50MGOe, is 10 times of ferrite.

 

    NdFeB magnets are very easy to be corroded. Therefore, most of the finished product should be electroplating or painting. Conventional surface treatment include: nickel (nickel copper nickel), zinc, aluminum, electrophoresis and so on. If you work in a closed environment, you can also use the way of phosphating.

    Will be a magnet in a closed-circuit environment is magnetizing the external magnetic field saturation technology to withdraw the external magnetic field, the magnet performance of the magnetic induction at this time we call the remanence. Magnet It represents the maximum flux that a magnet can provide. It can be seen from the demagnetization curve that it corresponds to the situation when the air gap of the magnet is zero. Therefore, the magnetic induction of the magnet in the actual magnetic circuit is smaller than the remanence. NdFeB is Br's highest practical permanent magnet material found today.

    The value of the inverse magnetic field strength needed to demagnetize the magnetic induction to zero when magnetically saturated after magnetization is reverse magnetized is called the coercivity (Hcb). However, the magnet company at this time the magnetization of the magnet is not zero, but the added reverse magnetic field and magnet magnetization cancel each other out. (External magnetic induction intensity is zero) At this time if the withdrawal of the external magnetic field, the magnet still has some magnetic properties. The coercivity of NdFeB is generally 11000Oe or more.


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