Rotating electric machine

A rotating electric machine comprising:

• a stator having a stator core to which an armature winding is wound around, and
• a rotor disposed on an inner side of the stator so as to face the stator in a radial direction, the rotor including:
• a field core having a cylindrical boss portion, and a plurality of claw-shaped magnetic pole portions that are arranged on an outer side of the boss portion and form poles of alternately different polarities in a circumferential direction,
• a field winding that is wound around an outer periphery of the boss portion and generates a magnetomotive force by energization,
• a permanent magnet disposed between the circumferentially adjacent claw-shaped magnetic pole portions so as to have its easy axis of magnetization oriented in the circumferential direction and have its polarity coincide with a polarity of the claw-shaped magnetic pole portions which alternately appears by excitation, and
• a magnetic flux short circuit member having a short circuit portion that magnetically connects the claw-shaped magnetic pole portions circumferentially arranged to have different polarities, wherein
• the rotor is configured to satisfy Ab·Bsb+As·Bss≥2·Br·Am and 0.03≤As/Ab≤0.22, where Ab is an axial cross-sectional area of the boss portion per a pair of NS magnetic poles, Bsb is a magnetic flux density of a material of the boss portion at a magnetic field strength of 5000 A/m, Br is a residual flux density of the permanent magnet, Am is a surface area of the permanent magnet at a magnetic flux inflow/outflow surface, As is a circumferential cross-sectional area of the short circuit portion, and Bss is a magnetic flux density of a material of the short circuit portion at a magnetic field strength of 5000 A/m.

A rotating electric machine comprising:

• a stator having a stator core to which an armature winding is wound around, and
• a rotor disposed on an inner side of the stator so as to face the stator in a radial direction, the rotor including:
• a pole core having a cylindrical boss portion, and a disc portion protruding radially outward from both axial ends of the boss portion with a predetermined pitch in a circumferential direction,
• a core member having a plurality of magnetic pole portions that are circumferentially arranged and form magnetic poles of alternately different polarities, a q-axis core portion located at a position deviated by 90 electrical degrees from a d-axis passing through the magnetic pole portions, and a short circuit portion that magnetically connects the magnetic pole portions circumferentially arranged to have different polarities,
• a field winding that is wound around an outer periphery of the boss portion and generates a magnetomotive force by energization, and
• a permanent magnet disposed between the magnetic pole portions and the q-axis core portion so as to have its polarity coincide with a polarity of the magnetic pole portions which alternately appears, wherein
• the rotor is configured to satisfy Ab·Bsb+As·Bss≥2·Br·Am and 0.03≤As/Ab≤0.22, where Ab is an axial cross-sectional area of the boss portion per a pair of NS magnetic poles, Bsb is a magnetic flux density of a material of the boss portion at a magnetic field strength of 5000 A/m, Br is a residual flux density of the permanent magnet, Am is a surface area of the permanent magnet at a magnetic flux inflow/outflow surface, As is a circumferential cross-sectional area of the short circuit portion, and Bss is a magnetic flux density of a material of the short circuit portion at a magnetic field strength of 5000 A/m.