| Summary: | 碩士 === 國立成功大學 === 電機工程研究所 === 83 === Permanent magnet brushless motors with higher torque-to-
inertia and higher efficiency have become a popular subject in
the application of servo motor control systems. Since they have
no commutator or carbon brush, they can rotate with high speeds
and require less maintenance. Thus brushless motors are
replacing DC motors as the drives need space angle data in
order to estabish the electrical commutator. Therefore some
type of shaft position sensor must be used, such as a photo
encoder or resolver. The presence of this shaft sensor, though,
may substantially reduce the overall ruggedness of the drive,
as well as increase significantly the drive cost. This paper
describes a way to use the voltage and current of the brushless
motor to cal- culate the space angle of the flux linkage and
estimate the speed of the motor for a closed loop speed control
system.
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