| 摘要 |
PURPOSE: A flat coreless vibration motor is provided to make a vibration motor become stable by minimizing the width and magnitude of a torque ripple generated at a two-phase coil and to minimize a vibration force reduced according to decrease in an outside diameter. CONSTITUTION: At least two coils are disposed so as not to be overlapped. A high-gravity weight is installed between the coils. A shaft(15) comprises a metal bearing(14) containing an oil so as to rotate by the contact with a center shaft of a rotator(10). One side of the metal bearing is configured to rotate by the contact with an upper case with the metal bearing projected to an opposite side to a magnet. A stator having a pair of brushes is placed in the magnet, and a plurality of commutators(16) are printed on a surface of a rotator opposite to the magnet so that a power is supplied by the pair of brushes. The rotator(10) is configured so that the commutators printed on a printed circuit board, which is contact with the brushes, are nonuniformly disposed.
|
