EMBEDDED PERMANENT MAGNET ELECTRIC MOTOR AND COMPRESSOR

摘要

An embedded permanent magnet electric motor obtained by arranging within a stator a rotor core (7) obtained by layering a plurality of electromagnetic steel sheets, wherein magnets constituting a magnetic pole of the rotor core (7) comprise: ferrite magnets (4) arranged in the circumferential direction of the rotor core (7) in a number equivalent to the number of poles, the ferrite magnets (4) being provided to the outer peripheral side of the rotor core (7); and rare earth magnets (3) arranged between the ferrite magnets (4); the cumulative thickness of the rotor core (7) is formed to be greater than the cumulative thickness of a stator core (24); the axial length (Lf) of the ferrite magnets (4) is formed to be greater than the axial length (Ln) of the rare earth magnets (3); the axial length (Ln) of the rare earth magnets (3) is formed to be substantially equivalent to the cumulative thickness of the stator core (24); the axial length (Lf) of the ferrite magnets (4) is formed to be substantially equivalent to the cumulative thickness of the rotor core (7) and the rare earth magnets (3) are provided to a position corresponding to an inner peripheral section of the stator core (24) with respect to the cumulative thickness direction of the rotor core (7).