송풍기의 디지틀 제어특성

A experimental study on the speed control of centrifugal fan has been performed for efficient operation of VAV system. The PWM inverter to control the 3-phase induction motor speed of centrifugal fan were used for manipulating air flow rate. In this study, PID control algorithm was implemented to control fan speed and the controller eliminates steady state errors in spite of external disturbances. The system response characteristics of digital control for the fan has been shown as a result. The effect of sampling time and reference input change on the system response was researched.