Patent ID: 6208047
Filing Date: 2001-03-27
Classification: H02K

Abstract:
A motor comprising:a rotor containing a cylindrical magnet having segments magnetized at predetermined pitches in a circumferential direction thereof, each of said magnetized segments being magnetized such that an inner portion and an outer portion are magnetized to different polarities and said magnetized segments disposed at adjacent pitches are magnetized to opposite polarities; anda stator for imparting a rotating magnetic field to said magnet so as to rotate said rotor, said stator containing a first polar tooth row and a second polar tooth row, each of which is constituted by polar teeth corresponding to the predetermined pitches of said magnetized segment such that the polar teeth disposed opposite to said magnetized segments across said magnet are magnetized to different polarities, and the polarities of said first polar tooth row and said second polar tooth row being switched so that a rotating magnetic field is imparted to said cylindrical magnet,wherein said polar teeth of said first polar tooth row are magnetized to the same polarity and said polar teeth of said second polar tooth row are magnetized to the same polarity which is different from the polarity of said first polar tooth row.