Patent ID: 6169348
Filing Date: 2001-01-02
Classification: H01R,H02K

Abstract:
A flat two-phase vibration motor comprising: a lower board attached to an upper surface of a lower case; a stator magnet disposed on the lower board and having four magnetic poles;a shaft supported between the lower case and an upper case; an upper board rotatably coupled to the shaft to be eccentrically supported thereby; two armature coils of different phases attached to the upper board such that each of the two armature coils has a pitch of a mechanical angle of 90.degree. and the two armature coils have a center angle therebetween of a mechanical angle of 135.degree. and a phase difference therebetween of an electrical angle of .pi./2; a commutator attached to the upper board around the shaft and having eight segments; and a pair of brushes having lower ends which are attached to the lower board and upper ends which are arranged such that they can be brought into contact with the segments of the commutator while being separated from each other by an electrical angle of 90.degree..