Design and testing of sinusoidal curve variable frequency control system for circulating fan in bulk curing barn
Scientific control of wind speed between tobacco leaves can improve quality of tobacco after cured in bulk curing barn. Regarding the light colour and high power consumption caused by inaccurate control of the current circulating fan, and different requirements for wind speed during the tobacco curing, this paper designed a variable frequency drive (VFD) to control the rotation speed of the circulating fan by a sinusoidal curve way, which includes speed value, amplitude, and frequency. With the design of anti-interference components, the VFD is integrated with the tobacco curing controller. The curing adoption of anti-interference for the VFD system will not affect the normal operation of the tobacco curing controller during tobacco curing. Compared with the traditional circulating fan with high speed and low speed options, the VFD system can accurately control the air speed during the tobacco curing process. This paper also presents an alternative method in terms of ventilation and humidity removal for industrial and agricultural production.