Patent ID: 8841813

Claim:
A brushless synchronous motor, comprising: a stator having a number of stator teeth provided with ends and a three-phase stator winding; a rotor configured to rotate relative to said stator, said rotor having a number n of embedded permanent magnets; said stator and said rotor forming an air gap therebetween; said permanent magnets defining an angle between two adjacent permanent magnets of 360°/n, where n>8; said stator teeth defining an angle between two adjacent stator teeth of 360°/n+2; and each of said stator teeth having a curved inner surface facing said rotor, said curved inner surface of each of said stator teeth having one end with a curvature valley and another end with a curvature peak, said stator having an inner contour formed by said inner surface of each of said stator teeth.