ROTOR AND BRUSHLESS MOTOR

摘要

PROBLEM TO BE SOLVED: To provide a rotor which has a ring magnet of a regular polygonal shape on an inner peripheral surface as a fixing surface for improving a fixing force and which can prevent the magnetic efficiency of the magnet from being lowered by adopting the regular polygonal shape on the inner peripheral surface. SOLUTION: The ring magnet 6 made of a pole orienting magnet magnetized so that poles appear at an equal interval only on the outer peripheral surface 6a of the ring magnet 6 is fixed to a collar 5 provided so as to be rotated integrally with a rotating shaft 4 in the rotor 3. The collar 5 has the outer peripheral surface 5b of a regular octagonal shape having corners 5d of the same number as the number of poles of "8" of the ring magnet 6 as seen from the axial direction. The ring magnet 6 has the inner peripheral surface 6b of the same shape as the outer peripheral surface 5b of the collar 5. This ring magnet 6 is magnetized so that the central part 6e of the pole appearing on the outer peripheral surface 6a is disposed on the straight line L1 of the radial direction which passes through the corner 6d of the inner peripheral surface 6b. COPYRIGHT: (C)2004,JPO&NCIPI