permanent magnets

The main reasons why magnetic materials are magnetic can be attributed to the following points: Magnetic materials, the raw materials used in neodymium magnet production, exhibit magnetism due to the alignment of their atomic structure. At the core of their behavior are electrons, which act as tiny magnetic dipoles. In other materials, these dipoles cancel each other out. However, in neodymium magnetic materials, a significant number of these dipoles align in the same direction, creating a unified magnetic field.   Neodymium magnets, the strongest type of permanent magnets, have exceptional magnetism due to their unique composition and density of neodymium magnet material. They are made from a blend of neodymium, iron, and boron, which, when processed and magnetized, form a crystal structure capable of sustaining a strong magnetic force. This structure allows for the concentration of a magnetic field in a compact area, resulting in the remarkable neodymium magnet force observed in various applications.     The production process further enhances this magnetic capability. During neodymium magnet production, the material is sintered and aligned in a magnetic field to ensure maximum dipole alignment. This precise manufacturing process contributes to the magnet's high coercivity and strength.   These characteristics make neodymium magnets essential for applications ranging from electric motors to renewable energy devices. Their great magnetic properties originate from the atomic level, amplified by advanced production techniques and material density, ensuring reliable and powerful performance.  

Neodymium ndfeb materials have poor thermal stability, and their high temperature coefficient can easily cause irreversible demagnetization (also known as demagnetization) when permanent magnet motors are running.   On the one hand, the eddy current of permanent magnet motors generates heat on the surface of permanent magnets, and the heat dissipation conditions inside the motor are poor, which exceeds the working temperature of permanent magnets, causing permanent magnet demagnetization. Therefore, the temperature stability of permanent magnets is crucial to motor applications.   On the other hand, the unreasonable design of the working point of the permanent magnet motor magnetic circuit is also prone to irreversible demagnetization. When the motor encounters a large demagnetization during starting, reversing and stalling, the working point of NdFeB may drop below the inflection point of the demagnetization curve, causing irreversible demagnetization. Therefore, the working point of the permanent magnet motor magnetic circuit should be designed to be higher than the inflection point of the NdFeB material. When the motor stops running, the residual magnetic induction intensity Br of the permanent magnet material remains basically unchanged.   The design of permanent magnet motors must also understand the actual operating environment of the motor and take necessary measures in assembly to ensure that it is in a stable state without demagnetization at high temperatures. The SH grade NdFeB magnets used in motors that meet the standard requirements cannot guarantee that the motor will not lose magnetism during operation. Only by increasing the intrinsic coercive force and Curie temperature of the NdFeB magnets can the irreversible magnetic loss of the NdFeB magnets be reduced and the temperature stability of the permanent magnets be improved, thereby extending the service life of the permanent magnet motor.