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: Ca1-x-yRxBayFe2n-zCoz, 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.