A new type of rare-earth permanent magnet brushless DC motor control system is introduced,which uses S3C44B0X as its control core and μCOS-Ⅱ as the real-time operating system. The hardware construction and software design are described.
With a view of developing new nanocrystalline Rare-Earth permanent magnets and improving the properties of existing nanocrystalline Rare-Earth permanent magnets, formation, structural and magnetic properties of metastable SmCo7 phase and Pr2Fe14B/α-Fe nanocomposite magnet have been investigated, using melt-spun technology.
The article discusses the application of permanent magnetic materials in motors and emphatically introduces some new permanent magnetic materials as rare-earth permanent magnets,Nanometre compound permanent magnets and gap-type nitride rare-earth permanent magnets which have good application prospects in small motors.
The structural and magnetic properties of SmFeN rare-earth permanent magnets have been introduced compendiously in this article first. Then the rationale and process of nitrogenization of Sm2Fe17Nx powder has been summarized. In the mean time, the affecting factors of nitrogenization has been described in particular.
The rare-earth permanent magnetic materials have been widely used in the fields of the computer technology, communction, aviation & space technology, and nuclear energy with the development of modern industry and defence science technology. However, some magnetic properties of the classical rare-earth permanent magnets, such as coercivity, Curie temperature and temperature coefficient aren't suited for the new demands.