Which of the following statements are correct regarding the construction characteristics of repulsion type single-phase induction motor?

1) The stator coil of the distributed non-salient pole type is injected into the slot of the flat-core stator.

2) A rotor carries a distributed coil (lap or wave), which is connected to the commutator.

3) The commutator should be an axial commutator whose bars are parallel to the shaft.

4) The carbon brushes run against the commutator and are used to conduct current through the armature coil.