Nd-Fe-B PERMANENT MAGNET WITHOUT DYSPROSIUM, ROTOR ASSEMBLY, ELECTROMECHANICAL TRANSDUCER, WIND T

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Disclosed is an Nd-Fe-B permanent magnet (354) including 28-34 weight% of rare-earth elements. The content of Dy in the rare-earth element is less than 0.1 weight%. The Nd-Fe-B permanent magnet (354) has a space extending in parallel to a magnetization direction thereof and exceeding 30 mm. In addition, disclosed is a rotor assembly (350) for an electromechanical transducer (340) including at least one of Nd-Fe-B permanent magnets (354). Further, disclosed are the electromechanical transducer (340) including the rotor assembly (350) and a wind turbine (100) including the electromechanical transducer (340).[Reference numerals] (354) Nd-Fe-B having 0% of DyCOPYRIGHT KIPO 2014