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This thesis proposes a DSP based, fully digital control
synchronous-motor-drive system. A new control algorithm is
developed to improve the chattering of the motor speed, which
is produced by sliding mode controller. In addition, the new
algorithm can provide a fast response and robust servo system.
First, the construction, characteristics, and modeling of the
motor are studied. Then, the vector control strategies with
their torque characteristics are explained. Next, a fuzzy-
sliding mode controller is derived. The slope of the sliding
line is on-line adjusted by the fuzzy controller. The proposed
method in the thesis can not only obtain a better performance
than sliding mode controller, but also achieve a better load
disturbance than the traditional PI controller.This paper uses
only a DSP to execute current-loop control, speed-loop control,
and d-q to a-b-c axis transformation. Moreover, the switching
frequency can achieve as high as 20 KHz. The experimental
results show that the proposed system can achieve a wide speed
range, a good transient response and a good steady-state
characteristics. Experimental results and computer simulation
validate theoretical analysis. This thesis provides a new
direction to design a synchronous reluctance motor drive system.
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