ND-FE-B PERMANENT MAGNET WITHOUT DYSPROSIUM, ROTOR ASSEMBLY, ELECTROMECHANICAL TRANSDUCER, WIND TURBINE

摘要

It is described a Nd-Fe-B permanent magnet (354) comprising 28-34 weight % of rare earth elements, wherein the content of Dy is smaller than 0.1 weight % and wherein the Nd-Fe-B per-manent magnet (354) has a spatial extension (h) parallel to a magnetization direction of the Nd-Fe-B permanent magnet (354) which is larger than 30 mm. It is further described a rotor assembly (350) for an electromechanical transducer (340), which rotor assembly (350) comprises at least one of such an Nd-Fe-B permanent magnet (354). Furthermore, it is described an electromechanical transducer (340) comprising such a rotor assembly (350) and a wind turbine (100) comprising such an electromechanical transducer (340).