Flat noncommutator vibration motor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 6, 2007
Grant Date -
Dec 23, 2004
app pub date -
Aug 30, 2002
filing date -
Dec 6, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is an improved flat vibration motor to be disposed in a mobile communication terminal, etc. for generating a vibration signal. A brushless-type vibration motor without brushes and a commutator is adopted, instead of a brush-type vibration motor with the brushes and commutator. An eccentric portion is disposed on one side of the peripheral surface of a rotor made of a permanent magnet, and one or more pairs of hall sensors are mounted in the vibration motor so as to start and drive the vibration motor. A motor controller may be used as internally or externally disposed on the vibration motor. The arrangement of a stator coil is improved so as to reduce the loss of magnetic flux as well as remove the non-operation points, thereby preventing the starting and driving disorders of the vibration motor, and improving its performance and efficiency.
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