Abstract: A stator has a plurality of core pieces being arranged in a ring shape around a rotation axis, and is configured such that a coupling part having a fitting structure is formed between the core pieces adjacent to each other in an arrangement of the ring shape, the coupling part allowing rotation about a pillar portion and restricting displacement in the axis direction by a snap-fit coupling that is formed with the pillar portion being provided on the yoke side of one of the core pieces and extending in a direction parallel to the axis and an open ring portion being provided on the yoke side of the other of the core pieces.

Abstract: A winding of a stator has a plurality of divisional coils. Where a number of poles of a rotor used together with the stator is P, a number of phases of an AC power supply applied to a rotating electric machine is M which is an integer not less than 3, and a number of slots is Sn, a number q of slots per pole per phase represented as q=Sn/(P×M) is an irreducible fraction. The divisional coils include two types which are a large-divisional coil of which a pair of slot-inside stored portions are each stored alone in the slot, and a small-divisional coil of which the pair of slot-inside stored portions are each stored in the slot together with the slot-inside stored portion of the other corresponding divisional coil.