Abstract: A rotor includes a rotor core, a first permanent magnet that is W1 mm long in a longitudinal direction, and a second permanent magnet that is W1 mm long in a longitudinal direction. The rotor core includes a first magnet insertion hole, a second magnet insertion hole, and a center lib. The first magnet insertion hole includes a first outside opening part having a radius of curvature of R1 mm, and a first inside opening part having a radius of curvature of R2 mm. The second magnet insertion hole includes a second outside opening part having a radius of curvature of R1 mm, and a second inside opening part having a radius of curvature of R2 mm. The rotor satisfies R1>R2 and 0<(R1+R2)/W1<0.082.

Abstract: An electric motor includes: a stator including a first stator core, a second stator core, and a slot in which a stator winding is disposed, and a rotor including a first rotor core facing a first stator core in a radial direction and a second stator core facing the second stator core in the radial direction. The first stator core and the second stator core are laminated in an axial direction. The stator includes a depression formed in a position facing the slot and not touching the stator winding. A volume of the first rotor core is smaller than a volume of the second rotor core.

Abstract: An electric motor includes a rotor, a stator, and a connection switching unit. The stator includes a stator core including 6×n (n is an integer equal to or larger than 1) slots, and three-phase coils forming 2×n magnetic poles. The connection switching unit switches a connection state of the three-phase coils between a first connection state and a second connection state. The three-phase coils include 2×n U-phase coils, 2×n V-phase coils, and 2×n W-phase coils in a coil end. Each coil of the three-phase coils is disposed in two slots across one slot on one end side of the stator core.

Abstract: A rotor includes a rotor core, a first permanent magnet that is W1 mm long in a longitudinal direction, and a second permanent magnet that is W1 mm long in a longitudinal direction. The rotor core includes a first magnet insertion hole, a second magnet insertion hole, and a center lib. The first magnet insertion hole includes a first outside opening part having a radius of curvature of R1 mm, and a first inside opening part having a radius of curvature of R2 mm. The second magnet insertion hole includes a second outside opening part having a radius of curvature of R1 mm, and a second inside opening part having a radius of curvature of R2 mm. The rotor satisfies R1>R2 and 0<(R1+R2)/W1<0.082.

Abstract: A method for producing an electric motor includes: connecting a first phase coil of three-phase coils to a positive side of a source of electrical power for magnetizing; passing an electric current through the three-phase coils in a state where a center of a magnetic pole of a rotor is rotated a first angle with respect to a center of a magnetic pole of the first phase coil; switching a connection with the positive side of the source of electrical power from the first phase coil to a second phase coil; and passing an electric current through the three-phase coils in a state where the center of the magnetic pole of the rotor is rotated a second angle with respect to a center of a magnetic pole of the second phase coil.

Abstract: An electric motor includes: a stator including a first stator core, a second stator core, and a slot in which a stator winding is disposed, and a rotor including a first rotor core facing a first stator core in a radial direction and a second stator core facing the second stator core in the radial direction. The first stator core and the second stator core are laminated in an axial direction. The stator includes a depression formed in a position facing the slot and not touching the stator winding. A volume of the first rotor core is smaller than a volume of the second rotor core.