Motor and cleaner comprising the same

A motor comprising:

• a stator including a stator core;
• a rotating shaft inside the stator;
• a rotor inside the stator and including the rotating shaft, the rotor configured to electromagnetically interact with the stator to rotate the rotating shaft;
• a housing in which the stator and the rotor are accommodated;
• an impeller coupled to the rotating shaft at an upper side of the housing, and configured to rotate with rotation of the rotating shaft to generate a flow of air;
• a bearing coupled to the housing and configured to support rotation of the rotating shaft while the stator and the rotor are stably accommodated in the housing,
• wherein a center of the stator core along an axial direction of the rotating shaft is closer to the impeller than the center of the rotor along the axial direction,
• the rotor and the stator are configured so that, a magnetic interaction between the rotor and the stator causes the rotor to move by a predetermined distance in a direction of the impeller, and
• the stator, the rotor, and the bearing are configured so that with the rotor moved by the predetermined distance in the direction of the impeller, the center of the stator core and the center of the rotor are at a same position with respect to the axial direction.

A motor comprising:

• a stator including a stator core;
• a rotating shaft inside the stator;
• a rotor inside the stator and including the rotating shaft, the rotor configured to electromagnetically interact with the stator to rotate the rotating shaft;
• a housing in which the stator and the rotor are accommodated;
• and
• a bearing coupled to the housing and configured to support rotation of the rotating shaft while the stator and the rotor are stably accommodated in the housing, the bearing including:
• a first bearing coupled to an upper side of the rotating shaft and including:
• a first outer ring coupled to the housing,
• a first inner ring interlocked with the rotating shaft so as to move with a movement of the rotor, and
• a ball between the first inner ring and the first outer ring, and
• a second bearing coupled to a lower side of the rotating shaft and including:
• a second outer ring coupled to the housing,
• a second inner ring interlocked with the rotating shaft so as to move with a movement of the rotor, and
• a ball between the second inner ring and the second outer ring,
• wherein the stator, the rotor, the first bearing, and the second bearing are configured so that,
• with a movement of the rotor in an axial direction of the rotating shaft,
• the first inner ring, second inner ring, and the rotating shaft move together in the axial direction to form a first gap in the axial direction between the first outer ring and the first inner ring and a second gap in the axial direction between the second outer ring and the second inner ring.