A stator for an electric machine, comprising: a plurality of stator poles arranged around a central axis and coupled to one another; a stator winding comprising a plurality of coils wound respectively on the plurality of stator poles, the plurality of coils being electrically connected to one another in the vicinity of axial ends of the plurality of stator poles and forming a plurality of connection portions; and an annular member disposed at the axial ends of the plurality of stator poles and coupled to the plurality of stator poles, the annular member together with the plurality of statorpoles enclosing a space for constraining the plurality of connection portions; wherein the annular member comprises: a snap-fitting mechanism through which the annular member is coupled to the plurality of stator poles; wherein the snap-fitting mechanism comprises a plurality of projections respectively disposed on at least a part of the plurality of stator poles near the axial ends, and a plurality of catching slots (1421, 1422) disposed on the annular member and respectively corresponding to the plurality of projections; wherein each projection of the plurality of projections is engaged in the corresponding catching slot (1421, 1422) so that relative movement between the annular member and the plurality of stator poles is restricted; characterized in that the plurality of catching slots (1421, 1422) comprise closed catching slots and open catching slots arranged along a circumference of the annular member, the closed catching slots are configured to block the corresponding projections from entering and leaving the closed catching slots, and the open catching slots are configured to not block the corresponding projections from entering and leaving the open catching slots. a plurality of stator poles arranged around a central axis and coupled to one another; a stator winding comprising a plurality of coils wound respectively on the plurality of stator poles, the plurality of coils being electrically connected to one another in the vicinity of axial ends of the plurality of stator poles and forming a plurality of connection portions; and an annular member disposed at the axial ends of the plurality of stator poles and coupled to the plurality of stator poles, the annular member together with the plurality of statorpoles enclosing a space for constraining the plurality of connection portions; wherein the annular member comprises: a snap-fitting mechanism through which the annular member is coupled to the plurality of stator poles; wherein the snap-fitting mechanism comprises a plurality of projections respectively disposed on at least a part of the plurality of stator poles near the axial ends, and a plurality of catching slots (1421, 1422) disposed on the annular member and respectively corresponding to the plurality of projections; wherein each projection of the plurality of projections is engaged in the corresponding catching slot (1421, 1422) so that relative movement between the annular member and the plurality of stator poles is restricted; characterized in that the plurality of catching slots (1421, 1422) comprise closed catching slots and open catching slots arranged along a circumference of the annular member, the closed catching slots are configured to block the corresponding projections from entering and leaving the closed catching slots, and the open catching slots are configured to not block the corresponding projections from entering and leaving the open catching slots. a snap-fitting mechanism through which the annular member is coupled to the plurality of stator poles; wherein the snap-fitting mechanism comprises a plurality of projections respectively disposed on at least a part of the plurality of stator poles near the axial ends, and a plurality of catching slots (1421, 1422) disposed on the annular member and respectively corresponding to the plurality of projections; wherein each projection of the plurality of projections is engaged in the corresponding catching slot (1421, 1422) so that relative movement between the annular member and the plurality of stator poles is restricted; characterized in that the plurality of catching slots (1421, 1422) comprise closed catching slots and open catching slots arranged along a circumference of the annular member, the closed catching slots are configured to block the corresponding projections from entering and leaving the closed catching slots, and the open catching slots are configured to not block the corresponding projections from entering and leaving the open catching slots.