Electric motor, air blower, and air conditioner

An air blower comprising:

• an electric motor;
• and
• an air blowing unit that is driven by the electric motor, wherein
• the electric motor includes
• a rotor including a rotor core and a plurality of permanent magnets fixed to an outer surface of the rotor core, the rotor having ten magnetic poles and being rotatable on a rotation axis, and
• a stator including a stator core having a plurality of electromagnetic steel sheets stacked in a rotation axis direction, and including a winding wound around the stator core by concentrated winding,
• the stator core includes
• twelve slots, and
• a tooth part having a front end surface facing the one permanent magnet of the plurality of permanent magnets, the tooth part being adjacent to at least one of the slots,
• the electric motor satisfies an expression of
• 1<t2/t1≤8
• where t1 is a minimum distance from a center of the front end surface in a circumferential direction to the one permanent magnet, and t2 is a distance from an end of the front end surface in the circumferential direction to the one permanent magnet, and
• a ratio R1/R2 of a distance R1 to a radius R2 of the stator is 0.50 or more and 0.625 or less, the distance R1 being a distance from the rotation axis to a permanent magnet center part that is a center of the one permanent magnet in the circumferential direction.

An air conditioner comprising:

• an indoor unit:
• and
• an outdoor unit connected to the indoor unit, wherein
• at least one of the indoor unit and the outdoor unit includes an electric motor,
• the electric motor includes
• a rotor including a rotor core and a plurality of permanent magnets fixed to an outer surface of the rotor core, the rotor having ten magnetic poles and being rotatable on a rotation axis, and
• a stator including a stator core having a plurality of electromagnetic steel sheets stacked in a rotation axis direction, and including a winding wound around the stator core by concentrated winding,
• the stator core includes
• twelve slots, and
• a tooth part having a front end surface facing one permanent magnet of the plurality of permanent magnets, the tooth part being adjacent to at least one of the slots,
• the electric motor satisfies an expression of
• 1<t2/t1≤8
• where t1 is a minimum distance from a center of the front end surface in a circumferential direction to the one permanent magnet, and t2 is a distance from an end of the front end surface in the circumferential direction to the one permanent magnet, and
• a ratio R1/R2 of a distance R1 to a radius R2 of the stator is 0.50 or more and 0.625 or less, the distance R1 being a distance from the rotation axis to a permanent magnet center part that is a center of the one permanent magnet in the circumferential direction.