Patent ID: 7847456

Claim:
A permanent magnet electrical rotating machine comprising: a stator; a rotor disposed to face an inner periphery of the stator with a certain gap, wherein the rotor comprises a rotor iron core; a plurality of permanent magnet sets disposed in magnet slots of the rotor iron core and arranged along an outer periphery of the rotor iron core to face the inner periphery of the stator with each magnet set provided for each pole so that polarities of the permanent magnet sets change alternately; and a cooling airflow channel formed between adjacent poles on the rotor iron core to circulate airflow and cool the rotor during rotation, wherein the cooling airflow channel extends to an axial direction of the rotor iron core, and extends from the outer periphery of the rotor iron core, in a radial direction, to a radial center of the rotor iron core; wherein the cooling airflow channel is provided with a mouth portion in an approximately trapezoidal shape at the outer periphery of the rotor iron core, and a stem portion extended from the mouth portion, in the radial direction, to the radial center of the rotor iron core; and wherein a width of the mouth portion expands from the stem portion, in the radial direction to the end of the outer periphery of the rotor iron core.