Motor

A motor, comprising:

• a stator, comprising a housing, wherein the housing has a top wall, a bottom wall opposite to the top wall, a side wall adjacent between the top wall and the bottom wall, and a first opening defined in the top wall;
• a rotor, comprising a rotating shaft, wherein the rotating shaft has a first magnetic unit, the first magnetic unit has a first outer surface, the first outer surface comprises a plurality of first magnetic pole surfaces and a plurality of second magnetic pole surfaces which are alternately arranged, and magnetic poles of the first magnetic pole surfaces are different from magnetic poles of the second magnetic pole surfaces;
• and
• a first bearing, disposed in the first opening, wherein the first bearing has a first groove, the first magnetic unit is located in the first groove, the first groove has a first inner surface facing the first outer surface, the first inner surface comprises a plurality of third magnetic pole surfaces and a plurality of fourth magnetic pole surfaces which are alternately arranged, magnetic poles of the third magnetic pole surfaces are different from magnetic poles of the fourth magnetic pole surfaces, the magnetic poles of the first magnetic pole surfaces are the same as the magnetic poles of the third magnetic pole surfaces, and the magnetic poles of the second magnetic pole surfaces are the same as the magnetic poles of the fourth magnetic pole surfaces.