Patent ID: 7173354
Filing Date: 2007-02-06
Classification: H02K,H02P

Abstract:
1. A flat brushless-typo vibration motor comprising: a rotor made of an axially-mounted permanent magnet with two or more magnetic poles; a ductile magnetic body bonded to a rear surface of the permanent magnet; three stator field coils arranged asymmetrically in a circumferential direction for generating a rotating magnetic field to rotate the permanent magnet; an insulating stator to which an axial rod and the field coils are fixed and defining a receiving space; one or more pairs of hall sensors for detecting the magnetic poles and their positions of the permanent magnet, said hall sensors disposed in said receiving space; a motor controller disposed in said receiving space for controlling an overall operation of the vibration motor; and eccentric means fixed to one side of a peripheral surface of the permanent magnet.