Motor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 27, 2001
Grant Date -
N/A
app pub date -
Dec 28, 1999
filing date -
Dec 28, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A motor incorporates a rotor 21 incorporating a cylindrical magnet 24 which has segments magnetized at predetermined pitches in a circumferential direction thereof; and a stator 25 for imparting a rotating magnetic field to the magnet 24 so as to rotate the rotor 21. Each of the magnetized segments is magnetized such that the inner portion and the outer portion are magnetized to different polarities and the magnetized segments disposed at adjacent pitches are magnetized to opposite polarities. The stator 25 incorporates 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 the magnetized segments such that the polar teeth disposed opposite to the magnetized segments across the magnet are magnetize to different polarities, and the polarities of the first polar tooth row and the second polar tooth row are switched so that a rotating magnetic field is imparted to the cylindrical magnet 24. In the embodiment, the first polar tooth row and the second polar tooth row consisting of polar teeth disposed opposite to one another cross the magnet 24 are composed of two pairs including one pair constituted by a core 26 and a stator cap 30 and one pair constituted by a core 27 and a stator cap 31.
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