Abstract
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(Co 0.72Fe 0.15Cu 0.1Zr 0.03) 7.5 magnet with B r>0.75 T and H ci>1300 kA/m at 300 °C can be obtained. According to the performance data of Sm(Co 0.72Fe 0.15Cu 0.1Zr 0.03) 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 °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.
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