Stator core, stator assembly and motor thereof

The stator core comprises inner teeth, inner grooves, outer teeth, outer grooves and a coupling yoke part, the width of an inner groove opening of each inner groove is equal to that of an outer groove opening of each outer groove, the number of the inner teeth and the number of the outer teeth are both multiple, a set of winding can be wound on the inner teeth, a set of winding can be wound on the outer teeth, and it can be seen that the number of the inner teeth and the number of the outer grooves are equal. The stator core can be applied to an inner rotor motor, an outer rotor motor or a double-rotor motor; the problems that a stator iron core of an existing structure cannot be applied to an inner rotor motor and an outer rotor motor at the same time, a special high-punching die for manufacturing a specific iron core needs to be additionally arranged, the die manufacturing cost is high, the motor cost is high, and iron core materials are poor in universality are solved, in addition, the width of an inner no