Application of high-temperature permanent magnets Sm(Co, Fe, Cu, Zr)Z in PPM focusing system

Rare earth permanent magnets Sm(Co, Fe, Cu, Zr)(Z) with outstanding performance and high-temperature thermal stability were fabricated. Optimized by Fe content and process, Sm(Co0.72Fe0.15Cu0.1Zr0.03)(7.5) magnet with B-r>0.75 T and H-ci>1300 kA/m at 300 degrees C can be obtained. According to the performance data of Sm(Co0.72Fe0.15Cu0.1Zr0.03)(7.5), the magnetic field along central axis B-Z in periodic permanent magnet (PPM) focusing system was simulated using electromagnetic field analysis software Maxwell 2D/3D. The B-Z exhibited typical cosine curve along central axis, and the peak value of B-Z was high enough to meet the demand of PPM focusing system at room temperature even at 200 +/- 20 degrees C. Additionally, a kind of simple cooling structure for PPM focusing system was designed by setting cooling pipe between polepieces. Simulated results showed that smooth cosine curve of B-Z was successfully achieved with good control of the thickness of cooling pipe.