Patent ID: 8217547

Claim:
A rotating electric machine comprising: a stator having an annularly-shaped stator core and a multiphase coil attached to the stator core and including a plurality of phase coils supplied with alternating currents of different phases respectively; and a rotor inserted in said stator and having a plurality of magnetic poles, said stator core including a yoke extending in a circumferential direction of said stator core, a plurality of stator teeth formed on a peripheral surface of the yoke and spaced from each other in the circumferential direction, and a plurality of slots defined between said stator teeth, said phase coils being inserted in said slots, said stator teeth including an inter-homo-phase tooth laterally sandwiched between two said slots in which said phase coils of the same phase are inserted respectively, and an inter-hetero-phase tooth laterally sandwiched between two said slots in which said phase coils of different phases are inserted respectively, and a magnetic flux path length between said rotor and said inter-hetero-phase tooth where a magnetic flux from said magnetic pole proceeds from said rotor and starts to enter said inter-hetero-phase tooth being longer than a magnetic flux path length between said rotor and said inter-homo-phase tooth where said magnetic flux proceeds from said rotor and starts to enter said inter-homo-phase tooth, wherein: said inter-hetero-phase tooth includes an inter-hetero-phase tooth body defined by a pair of sides located laterally in the circumferential direction of said stator core, and an inter-hetero-phase tooth head located radially inward of said stator core with respect to said inter-hetero-phase tooth body and extending continuously from said inter-hetero-phase tooth body, and said inter-hetero-phase tooth head includes at least one of a first receding portion extending continuously from one side of said pair of sides of said inter-hetero-phase tooth body and, toward radially inner side, extending away from a first imaginary side axis line and approaching a second imaginary side axis line, and a second receding portion extending continuously from the other side of said pair of sides of said inter-hetero-phase tooth body and, toward radially inner side, extending away from said second imaginary side axis line and approaching said first imaginary side axis line, where said first imaginary side axis line is an imaginary axis line extending along the one side of said pair of sides of said inter-hetero-phase tooth, and where said second imaginary side axis line is an imaginary axis line extending along the other side of said pair of sides of said inter-hetero-phase tooth.