Permanent magnet rotating electric machine

A permanent magnet rotating electric machine, comprising:

• a stator including a stator core and coils;
• a rotor, which is arranged so as to be opposed to the stator with a gap being a micro-gap, and is rotatable,
• wherein the rotor includes:
• a rotor core;
• a plurality of magnets embedded in the rotor core;
• and
• magnetic slits, each being formed in a core region of the rotor core, the core region being located between the magnets for forming one magnetic pole of the plurality of magnets and the gap, the magnetic slits being regions having a lower magnetic permeability than a magnetic permeability of the core region, within each core region is formed only more than one magnetic slits each being arranged along a same longest dimension of each of the more than one magnetic slits, a center line of each magnetic slit along the longest dimension of the each of the more than one magnetic slit dividing the core region into a first portion of the core region and a second portion of the core region, the first portion of the core region being located on an upstream side of a rotation direction of the rotor with respect to the second portion of the core region,
• wherein a ratio of
• a length of an outer periphery of the rotor in the first portion of the core region to
• a first total length of all magnet magnetic flux generation sides of the magnets in the first portion of the core region
• is smaller than a ratio of
• a length of the outer periphery of the rotor in the second portion of the core region to
• a second total length of all magnet magnetic flux generation sides of the magnets in the second portion of the core region.

A permanent magnet rotating electric machine, comprising:

• a stator including a stator core and coils;
• a rotor, which is arranged so as to be opposed to the stator with a gap being a micro-gap, and is rotatable,
• wherein the rotor includes:
• a rotor core;
• a plurality of magnets embedded in the rotor core;
• and
• magnetic slits, each being formed in a core region of the rotor core, the core region being located between the magnets for forming one magnetic pole of the plurality of magnets and the gap, the magnetic slits being regions having a lower magnetic permeability than a magnetic permeability of the core region, within each core region is formed only one magnetic slit, a center line passing through a center of the only one magnetic slit along a longest dimension of the only one magnetic slit dividing the core region into a first portion of the core region and a second portion of the core region, the first portion of the core region being located on an upstream side of a rotation direction of the rotor with respect to the second portion of the core region,
• wherein a ratio of
• a length of an outer periphery of the rotor in the first portion of the core region to
• a first total length of all magnet magnetic flux generation sides of the magnets in the first portion of the core region
• is larger than a ratio of
• a length of the outer periphery of the rotor in the second portion of the core region to
• a second total length of all magnet magnetic flux generation sides of the magnets in the second portion of the core region.