A permanent magnet motor comprising: a rotor including a rotor iron core and a plurality of rare earth permanent magnets provided to the rotor iron core; and a stator including a stator iron core having a plurality of teeth, and two sets of three-phase armature windings provided in a plurality of slots formed in the stator iron core, a first armature winding being supplied with current from a first inverter and a second armature winding being supplied with current from a second inverter, wherein the two sets of three-phase armature windings are defined such that the first armature winding corresponds to U1 phase, V1 phase, and W1 phase and the second armature winding corresponds to U2 phase, V2 phase, and W2 phase, the U1 phase, the V1 phase, and the W1 phase of the first armature winding are shifted by an electric angle of 20° to 40° from the U2 phase, the V2 phase, and the W2 phase of the second armature winding upon driving, characterized in that the U1 phase of the first armature winding is provided in both slots of any one pair of adjacent slots of the plurality of slots, or at least one of the U1 phase of the first armature winding and the U2 phase of the second armature winding is provided in one slot of any one pair of adjacent slots of the plurality of slots, and a slot opening width Ws of the stator iron core is set so as to satisfy Ws/(2πRs/Ns) ≦ 0.15, where Rs is an inner radius of the stator iron core and Ns is a slot number of the stator iron core, and a core back thickness Wc of the stator iron core is set to be in a range of 0.18 ≤ Wc/(2πRs/M) ≤ 0.50, where M is a pole number of the rotor. a rotor including a rotor iron core and a plurality of rare earth permanent magnets provided to the rotor iron core; and a stator including a stator iron core having a plurality of teeth, and two sets of three-phase armature windings provided in a plurality of slots formed in the stator iron core, a first armature winding being supplied with current from a first inverter and a second armature winding being supplied with current from a second inverter, wherein the two sets of three-phase armature windings are defined such that the first armature winding corresponds to U1 phase, V1 phase, and W1 phase and the second armature winding corresponds to U2 phase, V2 phase, and W2 phase, the U1 phase, the V1 phase, and the W1 phase of the first armature winding are shifted by an electric angle of 20° to 40° from the U2 phase, the V2 phase, and the W2 phase of the second armature winding upon driving, characterized in that the U1 phase of the first armature winding is provided in both slots of any one pair of adjacent slots of the plurality of slots, or at least one of the U1 phase of the first armature winding and the U2 phase of the second armature winding is provided in one slot of any one pair of adjacent slots of the plurality of slots, and a slot opening width Ws of the stator iron core is set so as to satisfy Ws/(2πRs/Ns) ≦ 0.15, where Rs is an inner radius of the stator iron core and Ns is a slot number of the stator iron core, and a core back thickness Wc of the stator iron core is set to be in a range of 0.18 ≤ Wc/(2πRs/M) ≤ 0.50, where M is a pole number of the rotor.