NEMA SM 1-2017涵盖了无励磁转子绕组的通用同步电机，包括额定功率小于等于500马力的多相交流永磁电机。

NEMA SM 1-2017 covers general-purpose synchronous motors without excited rotor windings, including polyphase alternating current permanent magnet motors rated 500 horsepower and less.