Patent ID: 7573176
Filing Date: 2009-08-11
Classification: H02K

Abstract:
1. A dynamo-electric machine comprising: a stator having an imaginary axis; and a plurality of rotors that are independently rotatable about the imaginary axis, at least two of the rotors being arranged at axially front and rear positions of the stator, each rotor having a plurality of permanent magnets; wherein at least one of the rotors is constructed to have a first magnetic path that extends in a circumferential direction of the rotor, at least one of the rotors is constructed to have a second magnetic path that extends in a radial direction of the rotor, at least one of the rotors is of an interior permanent magnetic type (IPM) and includes an inside yoke that faces an axial end of the stator; and wherein a magnetic resistance of a part of the inside yoke by which the same poles of the permanent magnets are magnetically connected is lower than that of another part of the inside yoke by which the different poles of the permanent magnets are magnetically connected.