ELECTRIC MACHINE WITH INNER AND OUTER ROTOR

摘要

An electric rotating machine including inner and outer rotors coaxially disposed and driven by a compound current, and a stator disposed between the rotors. Each of the rotors includes a plurality of permanent magnets circumferentially arranged. The stator includes a stator core and a coil to which the compound current is applied. The stator core includes a plurality of circumferentially arranged stator pieces with the coils. The stator pieces have a same shape and are formed by plates laminated in axial alignment with each other. Each stator piece includes inner and outer yokes disposed radially inside and outside, respectively, and a coil area defined between the yokes. The stator pieces adjacent to one another include a first air gap circumferentially formed between the adjacent outer yokes, a second air gap circumferentially formed between the adjacent inner yokes and mutual contact portions circumferentially contacted at the inner yokes.