Patent ID: 7915776
Filing Date: 2011-03-29
Classification: H02K

Abstract:
1. A permanent magnet type electric rotary machine comprising: a stator including a stator core having teeth and slots between adjacent teeth, and a concentrated winding as an armature winding installed in each of the slots so as to surround each of the teeth; and a rotor provided with permanent magnets as magnet poles installed in a plurality of permanent magnet insertion holes provided in a rotor core respectively, the rotor being rotatably supported inside the stator keeping a gap between the rotor core and the stator core by a rotating shaft, wherein defining that a magnetic flux axis of each of the permanent magnets is a d-axis, and an axis 90° apart in electrical angle from the d-axis is a q-axis, respective install positions of the permanent magnets in the rotor core are set between adjacent q-axes, wherein a pole core portion between each of the permanent magnets and an outer surface of the rotor core is provided with a plurality of pole slits, wherein the region of the pole core portion is defined by concave portions provided on q-axes to be interpolars on both sides of the pole core portion, and thereby configured that a gap (g wherein the outer surface like an arc-shape of the pole core portion is formed asymmetrically with respect to the d-axis by making circumferential-direction lengths of the concave portions on both sides of the pole core portion different from each other; and wherein each of the concave portion is formed in the axial direction of the rotor core, with a stepped v-shape skew structure in view of the circumferential direction of the rotor core, so that the pole core portion has a stepped v-shape skew structure.