Patent ID: 7868502

Claim:
A brushless direct current (BLDC) motor, comprising: a stator having a plurality of teeth formed at an inside thereof; a plurality of coils, each of the plurality of coils being wound around a corresponding tooth of the stator; a rotor located at the inside of the stator; a plurality of magnets located at an edge portion of the rotor; a plurality of magnet placement portions located on the rotor, each magnet placement portion having a first and second barrier formed at opposite ends of the magnet placement portion, the first barrier and second barrier of adjacent magnet placement portions being separated by a gap portion, each of the plurality of magnets being inserted into a corresponding magnet placement portion; and at least one of the gap portions includes a third barrier located completely therein, wherein at least one virtual line parallel to a center line connecting centers of end portions of at least one pair of adjacent magnets passes through at least the first, the second and the third barriers, wherein at least one virtual line parallel to the center line connecting centers of end portions of the at least one pair of adjacent magnets passes through only the first and the second barriers, and wherein the gap portion is defined by ends of the adjacent first and second barriers, a virtual line passing an inner corner of the adjacent first and second barriers, and a virtual line passing an outer corner of the adjacent first and second barriers.