A permanent magnet motor, comprising: a rotor including a rotor core fixed on a motor shaft, and permanent magnets fixed on the rotor core; a stator including a stator core, whose inner circumferential face opposes to an outer circumferential face of the rotor by means of a magnetic air gap, having a plurality of slots for accommodating armature windings, and a plurality of teeth; wherein the armature windings are constituted of a plurality of groups of multi-phase distributed windings (39, 40); the plurality of groups of multi-phase distributed windings (39, 40) is supplied with electric power from individual inverters in every one of respective groups; portions of the rotor core exist on a side nearer to the stator than a middle diameter between a maximum outer diameter and a minimum outer diameter of the permanent magnets; the plurality of teeth each include respective flanges; the flanges each have a lateral side portion thereof opposing to a lateral side portion of a flange being provided in the teeth adjacent to each other and protruding in a circumferential direction of the stator core; when a height in the lateral side portion of the flanges in a radial direction of the stator core is defined as h, and a length of the magnetic air gap is defined as g, relationship 1 ≤ h / g ≤ 2 is held; and also, when a circumferential distance between opposing faces of the flanges being adjacent to each other is defined as a, relationship a / g ≥ 0.2 is satisfied, characterized in, when a circumferential width of the slots corresponding to a portion of the teeth, existing from the flanges on an outer radial side of the stator, where the circumferential width of the stator becomes a smallest is defined as S1, a maximum outer diameter of the rotor core is defined as Rout, and the number of slots is defined as Ns, the width S1 of the slots satisfies a relationship: 0.5 × 2 π Rout + g + h / Ns ≤ S1 ≤ 0.6 × 2π (Rout + g + h) /Ns, and also the circumferential width of the slots gradually increases in accordance with a position on an outer radial side of the stator, and is maximized on a back-portion of the slots or a back-portion's vicinity thereof. a rotor including a rotor core fixed on a motor shaft, and permanent magnets fixed on the rotor core; a stator including a stator core, whose inner circumferential face opposes to an outer circumferential face of the rotor by means of a magnetic air gap, having a plurality of slots for accommodating armature windings, and a plurality of teeth; wherein the armature windings are constituted of a plurality of groups of multi-phase distributed windings (39, 40); the plurality of groups of multi-phase distributed windings (39, 40) is supplied with electric power from individual inverters in every one of respective groups; portions of the rotor core exist on a side nearer to the stator than a middle diameter between a maximum outer diameter and a minimum outer diameter of the permanent magnets; the plurality of teeth each include respective flanges; the flanges each have a lateral side portion thereof opposing to a lateral side portion of a flange being provided in the teeth adjacent to each other and protruding in a circumferential direction of the stator core; when a height in the lateral side portion of the flanges in a radial direction of the stator core is defined as h, and a length of the magnetic air gap is defined as g, relationship 1 ≤ h / g ≤ 2 is held; and also, when a circumferential distance between opposing faces of the flanges being adjacent to each other is defined as a, relationship a / g ≥ 0.2 is satisfied, characterized in, when a circumferential width of the slots corresponding to a portion of the teeth, existing from the flanges on an outer radial side of the stator, where the circumferential width of the stator becomes a smallest is defined as S1, a maximum outer diameter of the rotor core is defined as Rout, and the number of slots is defined as Ns, the width S1 of the slots satisfies a relationship: 0.5 × 2 π Rout + g + h / Ns ≤ S1 ≤ 0.6 × 2π (Rout + g + h) /Ns, and also the circumferential width of the slots gradually increases in accordance with a position on an outer radial side of the stator, and is maximized on a back-portion of the slots or a back-portion's vicinity thereof.