Patent ID: 7482724

Claim:
An interior permanent magnet electric rotating machine comprising: a stator; and a rotor including a rotor core and a plurality of permanent magnets functioning as a field magnet system, wherein said rotor has a side face opposed to said stator, wherein said permanent magnets each have a pole face opposed to said side face, wherein said permanent magnets are embedded so that a maximum value of a distance from said pole face to said side face satisfies the following formulas (1a) and (1b) which are represented by a radius r of said rotor n 1 and a number of poles of said field magnet system: x≦D/ 10, and (1a) D= 2 πr/n 1 , and (1b) wherein an adjacent two of said permanent magnets, which function as adjacent two poles of said field magnet system, are spaced apart so that the following formula (2) is satisfied, which is described using a q-axis inductance L q , and d-axis inductance L d : 0.3<( L q −L d )/ L d (2).