Technical Faculty "Mihajlo Pupin" Zrenjanin, University of the Novi Sad, Novi Sad, SerbiaThe vibratory conveyors with electromagnetic drive are used for performing gravimetric flow of granular materials in processing industry. By realizing free vibrations of variable intensity and frequency over a wide range through application of the electromagnetic actuator, suitable power converter, and the corresponding controller, continuous conveyance of granular materials have been provided for various operating conditions. Standard power output stages intended for control of vibratory conveyance using thyristors and triacs. Phase angle control can only accomplish tuning of amplitude oscillations, but oscillation frequency cannot be adjusted by these converters. Application of current controlled transistor converters enables accomplishing the amplitude and/or frequency control. Their use implies the excitation of a vibratory conveyor independent of the supply network frequency. In addition, the frequency control ensures operation in the region of mechanical resonance. Operation in this region is favourable from the energy point of view, since it requires minimal energy consumption. The paper presents a possible solution and advantages of the amplitude-frequency control of vibratory conveyors by means of a current controlled power converter.

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The applications of wireless technologies in industrial automation, monitoring and control systems has already proved itself. The technologies like IEEE 802.15.4, ZigBee, Bluetooth Low Energy, WirelessHART, Wi-Fi and others are widely used in sensor networks environments. This paper presents the approach of evaluating the applicability of opensource ZigBee RF module MeshBee® in wireless sensor environments and for potential use in monitoring and control systems. This paper presents the platform and experiment for ZigBee module evaluation. The platform presented in this paper is based on widely used microcontroller unit Arduino UNO Rev3 in combination with MeshBee® wireless module.

A practically realized solution of a power supply for vibratory conveyor drives is presented. The solution is an improvement from the quality of electrical energy point of view. An analysis is given of the AC/DC converter used as the input active filter serving for reduction of the undesired higher harmonics of the input (network) current and improvement of the power factor. The experimental results are presented together with an analysis of the characteristic waveforms (oscilloscopic records of the network voltage and current) at steady state, obtained by the realized converter.