Three-phase permanent-magnet electric rotating machine

A three-phase permanent-magnet electric rotating machine comprising:

• a stator which includes:
• a first stator iron core made from a magnetic material, and having a first disc portion, and 3n (n being an even number not smaller than 2) first magnetic poles erected perpendicularly from an outer circumference of said first disc portion;
• a second stator iron core made from a magnetic material, and having a second disc portion having a diameter which is smaller than a diameter of said first disc portion, and 3n second magnetic poles erected perpendicularly from an outer circumference of said second disc portion so that said 3n second stator iron cores are disposed concentrically with said 3n first magnetic poles;
• and excitation windings mounted on every other one of said 3n pairs of said first and second magnetic poles, each of said windings having a predetermined width in an axial direction;
• and
• a rotor having outer and inner circumferential surfaces on each of which a predetermined number of pairs of N and S magnetic poles are alternatively formed by permanent magnets in a direction of rotation of said rotor, said rotor being rotatably supported so that said pairs of N and S magnetic poles provided on said outer and inner circumferential surfaces of said rotor face said first poles and said second poles at predetermined air gaps respectively at top end portions of said first magnetic poles of said first stator iron core and said second magnetic poles of said second stator iron core beyond positions where said excitation windings are mounted.

A three-phase permanent-magnet electric rotating machine comprising:

• a stator including:
• a disc portion of a magnetic substance;
• 3n (n being an integer not smaller than 1) magnetic poles each of which is formed from a magnetic substance and bent like a U-shape so that each of said magnetic poles has long and short sides parallel with each other and a side connecting said long and short sides to each other, free ends of said long sides of said respective magnetic poles being magnetically and mechanically connected to said disc portion so as to be erected perpendicularly to said disc portion at its outer circumferential portion, said short sides of said respective magnetic poles being arranged as claw poles and said short sides being located closer to a rotor than said long sides;
• and excitation windings mounted on said magnetic poles, each of said windings having a predetermined width in an axial direction;
• and
• the rotor constituted by permanent magnets so that a predetermined number of pairs of S and N magnetic poles are arranged alternately in a direction of rotation of said rotor so as to face said claw poles of said magnetic poles through a predetermined air gap.

A three-phase permanent-magnet electric rotating machine comprising:

• a stator including:
• a disc portion of a magnetic substance;
• 3n (n being an even number not smaller than 2) magnetic poles each of which is formed from a magnetic substance and bent like a U-shape so that each of said magnetic poles has long and short sides parallel with each other and a side connecting said long and short sides to each other, free ends of said long sides of said respective magnetic poles being magnetically and mechanically connected to said disc portion so as to be erected perpendicularly to said disc portion at its outer circumferential portion, said short sides of said respective magnetic poles being arranged as claw poles and said short sides being located closer to a rotor than said long sides;
• and excitation windings mounted on every other one of said magnetic poles, each of said windings having a predetermined width in an axial direction;
• and
• the rotor constituted by permanent magnets so that a predetermined number of pairs of S and N magnetic poles are arranged alternately in a direction of rotation of said rotor so as to face said claw poles of said magnetic poles through a predetermined air gap.