Research on the dynamic changes of magnetic domain structure and performance stability of motor magnets under extreme temperature fields
Publish Time: 2024-12-03
During the operation of motors, motor magnets often face the test of extreme temperature fields. It is of great significance to deeply explore the dynamic changes of magnetic domain structure and performance stability under such conditions.
When in an extremely high temperature environment, the thermal motion inside the magnetite intensifies. The thermal vibration of atoms will interfere with the orderly arrangement of magnetic moments in the magnetic domain, causing the magnetic domain wall to become unstable and gradually shift. As the temperature rises further, the magnetic domain structure gradually disintegrates, and the originally regular magnetic domain shape and distribution are disrupted. This change in the magnetic domain structure directly leads to the weakening of the magnetism of magnetite, which is manifested as a decrease in remanence and coercive force. For example, in some high-temperature industrial motor application scenarios, long-term high-temperature operation may reduce the magnetism of magnetite to the extent that it affects the normal operation of the motor, resulting in a decrease in motor output power and efficiency.
In an extremely low temperature environment, the situation is different. Low temperature will cause the crystal structure of magnetite to shrink to a certain extent, which will affect the interaction of magnetic moments in the magnetic domain. On the one hand, the order of the magnetic moment in the magnetic domain may be enhanced, so that the magnetism is enhanced to a certain extent; but on the other hand, excessive contraction may also induce internal stress, resulting in local distortion or deformation of the magnetic domain wall, which has a complex effect on the magnetism.
In order to ensure the stable operation of the motor under extreme temperature fields, it is necessary to conduct in-depth research on this characteristic of magnetite. By adopting advanced microscopic detection technologies, such as magnetic force microscopy and neutron diffraction, the dynamic change process of the magnetic domain structure at different temperatures is monitored in real time, and an accurate mathematical model is established to describe the relationship between the magnetic domain structure and temperature and magnetic properties. Then, in the motor design stage, according to the actual operating temperature environment, the appropriate magnetite material is selected or optimized, such as adding specific doping elements to improve its performance stability at extreme temperatures, or designing effective heat dissipation or insulation structures to reduce the adverse effects of extreme temperatures on the magnetic domain structure and performance of magnetite, and ensure that the motor can operate efficiently and reliably under various complex temperature conditions.
