ROTATING MACHINE, BONDED MAGNET, MAGNET ROLL, AND PROCESS FOR PRODUCING FERRITE SINTERED MAGNET

摘要

A rotating machine comprising a sintered ferrite magnet having an M-type ferrite structure, comprising Ca, an R element that is at least one of rare earth elements and indispensably includes La, Ba, Fe and Co as indispensable elements, and having a composition represented by the formula: Ca 1-x-y R x Ba y Fe 2n-z Co z , wherein (1-x-y), x, y, z and n represent the contents of Ca, the R element, Ba and Co, and a molar ratio, meeting 0.3 ‰¤ 1-x-y ‰¤ 0.65, 0.2 ‰¤ x ‰¤ 0.65, 0.001 ‰¤ y ‰¤ 0.2, 0.03 ‰¤ z ‰¤ 0.65, 4 ‰¤ n ‰¤ 7, and 1-x-y > y; a bonded magnet comprising ferrite powder having the above composition and a binder, and a magnet roll, at least one magnetic pole portion of which is made of the above bonded magnet.