Parmanent magnet dynamo electric machine

An electrically driven motor vehicle, including a permanent magnet dynamo electric machine as a part of a driving mechanism, wherein said permanent magnet dynamo electric machine comprises:

• a stator having a stator iron core in which a stator winding is wound,
• a rotor facing the inner circumference of said stator and rotatably supported thereby, said rotor being constituted by a columnar rotor iron core,
• a shaft provided along the rotation axis of said rotor iron core, and
• a plurality of permanent magnets arranged in a ring along the circumference of said rotor iron core,
• wherein a number of permanent magnet insertion holes equal to the number of permanent magnets are provided completely within the circumference of said rotor iron core, and said permanent magnets are positioned in the insertion holes and completely within the circumference of said rotor iron core at positions at which a ratio R1/R0 is equal to or more than 0.85, where R0 is the radius of said rotor and R1 is the radius of an imaginary circle drawn by inscribing the faces of the plurality of permanent magnets at the side thereof remote from said stator, and
• wherein said rotor iron core is further provided with a plurality of vents between said shaft and the permanent magnet insertion holes.

An electrically driven motor vehicle, including a permanent magnet dynamo electric machine as a part of a driving mechanism, wherein said permanent magnet dynamo electric machine comprises a stator having a stator iron core in which a stator winding is wound,

• a rotor facing the inner circumference of said stator and rotatably supported thereby, said rotor being constituted by a columnar rotor iron core,
• a shaft provided along the rotation axis of said rotor iron cores, and
• a plurality of permanent magnets arranged in a ring along the circumference of said rotor iron core,
• wherein a number of permanent magnet insertion holes equal to the number of permanent magnets are provided within said rotor iron core, and said permanent magnets are positioned within the insertion holes at positions (where) at which a ratio R1/R0 is equal to or more than 0.85, where R0 is the radius of said rotor and R1 is the radius of an imaginary circle drawn by inscribing the faces of the plurality of permanent magnets at the side thereof remote from said stator, and
• wherein the circumferential length of said permanent magnet insertion holes is longer than that of said permanent magnets so that, when said permanent magnets are inserted into the corresponding permanent magnet insertion holes, a pair of gaps are formed at both ends of each of said permanent magnets.