Patent ID: 7485993
Filing Date: 2009-02-03
Classification: H02K

Abstract:
1. A direct current (DC) brushless vibration motor, comprising: a circuit board which has a power input port and an axle; an inductive coil wound axially by a single conductive wire on the circuit board to receive current to form magnetic poles; a magnetic element rotateably disposed around the axle and corresponding to the inductive coil, the magnetic element having a plurality of coplanar magnetic poles that are arranged sequentially according to like and unlike polarities, the plurality of the coplanar magnetic poles with like polarity corresponding to the formed magnetic poles of the inductive coil, and the magnetic element having at least one centrifugal slot to alter the gravity center of the magnetic element; and a controller located on the circuit board approximate to one of the coplanar magnetic poles and electrically connected to the inductive coil; wherein the controller is induced by the approximate pole of the magnetic element to control the current flowing through the inductive coil to form the magnetic poles having polarity unlike to the polarity of the corresponding magnetic poles of the magnetic element to form a magnetic polarity repulsive to the magnetic element thereby the magnetic element generates a rotation kinetic energy about the axle and produces vibration.