PERMANENT MAGNET BURIED TYPE ELECTRIC MOTOR

摘要

If the straight line joining a rotation center (O) of a rotor and the magnetic pole center or the center of a permanent magnet (25) is a d-axis, and if the straight line joining the rotation center (O) and an intermediate point, at which the permanent magnets (25) are adjacent to each other, is a q-axis, mutually adjacent arcs (A1 and A2) are set such that the radius (R1) of the arc (A1) on the d-axis side is larger than the radius (R2) of the arc (A2) on the q-axis side, and such that, at the point of intersection (ß) between the arcs (A1 and A2), the angle (a) of a tangent (u) of the arc (A2) on the q-axis side with respect to atangent (t) of the arc (A1) on the d-axis side is set by -3 degrees = a = 2 degrees.