Authors : Zeljko Despotovic and Aleksandar Ribic
Abstract: The electromagnetic vibratory conveying drives provide easy control gravity flow of bulk and particulate materials. The achievement of free vibration of variable intensity and frequency in a wide range through adequate power converter and corresponding controller ensures the continuous flow of material under different conditions. Today, as a standard semiconductor output stage of power using thyristors and triacs. This implies the use of phase control. Considering that in this case, fixed frequency of power grid, changing the phase angle can be achieved by adjusting the amplitude of oscillations of the conveyor but not its frequency. Transistor converters in addition to amplitude control provided the frequency control. In this way, the excitation of transporter is independent of the main frequency. Frequency control provides operation of vibratory conveyors in the region of mechanical resonance. Working in the resonance band is energetically favorable, since then has minimal power consumption of the entire vibratory conveying drive. This study presents a concrete implemented, current controlled transistor converter used to excite resonant electromagnetic vibration conveyor and experimental results as an indicator of energy efficiency.
Zeljko Despotovic and Aleksandar Ribic, 2012. The Increasing Energy Efficiency of the Vibratory Conveying Drives with Electromagnetic Excitation. International Journal of Electrical and Power Engineering, 6: 38-42.