Nd-Fe-B permanent magnet without Dysprosium, rotor assembly, electromechanical transducer, wind t

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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 permanent 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).