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The software system includes the PWM principle, the velocity measurement procedures and PI control
algor ithm. The motor speed feedback signals are processed and calculatied by the TMS320F2812. The duty
cycle of PWM is adjusted by the PI controler. The experimental results show that the system achieves the
accurate regulation of a small servo motor. The control system with broad application prospects have the
high accuracy, the wide measuring range, the strong adaptability and high reliability
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Key words: DC servo motor; DSP; LCD; PWM; PI