Abstract: A motor includes a rotor having permanent magnets, and a stator having a stator core. The stator core includes a magnetic yoke and a plurality of stator teeth. Each stator tooth includes a tooth portion and a pole shoe. A slot with a width C is defined between neighboring pole shoes. A minimum distance between one of the pole shoes and the corresponding one of the permanent magnets is defined as D. A distance from a slot center point of one of the slot of the stator core to an air gap centreline along a radial direction of the stator core is defined as B. A distance from the air gap centerline to the corresponding one of the permanent magnets along the axial direction of the stator core through the slot center point is defined as A. The values of A, B, C and D satisfy the following formulas: A=B; A+B=(4˜5)*D; C=(0.9˜1.1)*(A+B).