Abstract
The vibratory feeders with electromagnetic excitation called electromagnetic vibratory feeders (EMVF) are commonly used for performing gravimetric flow of granular and particulate materials in processing industry. This drives offer easy and simple control the mass flow of conveying materials. In comparison with other drives (pneumatics, inertial, centrifugal, etc...), these have a more simple construction and they are compact, robust and reliable in operation. The absence of wearing mechanical part, such as gears, cams belts, bearings, eccentrics, etc., makes EMVF, most economical equipment. Standard power electronic output stages intended for control of the EMVF using SCR devices (thyristors and triacs). This implies phase angle control (PAC) and constant frequency of vibration. In this way control circuit must be synchronized to the mains supply frequency 50(60) Hz. PAC can only accomplish tuning amplitude of vibration, but not vibratory frequency. Application of transistor (IGBT or MOSFET) switch mode power converters enables accomplishing the amplitude and (or) frequency control of EMVF. Their use implies the excitation of an EMVF independent of the mains supply frequency. In addition, the frequency control ensures operation in the region of mechanical resonance. This operation is highly efficient, because large output displacement is provided by small input power. An optimal and efficient operation requires tracking of resonant frequency. This paper presents possible solution of the amplitude frequency control of EMVF and corresponding simulation and experimental results.
Highlights
The vibration energy has proved, for many years its operational reliability in various technological processes: discharging bulk materials from bins, conveying them over limited distances, charging and dosing them continuously, compacting, loosening, screening, grading them...etc
The design of the vibratory feeder with electromagnetic excitation i.e. electromagnetic vibratory feeder (EMVF) is based on a system of two masses coupled by means of an elastic component consisting of flexible leaf composite springs
In simulations were set parameters that correspond to real EMVF system and real electromagnetic vibratory actuator (EVA)
Summary
The design of the vibratory feeder with electromagnetic excitation i.e. electromagnetic vibratory feeder (EMVF) is based on a system of two masses coupled by means of an elastic component consisting of flexible leaf composite springs (commonly FiberglassTM). By realizing free vibrations of variable amplitude and frequency, over a wide range application of the twomass oscillatory system , suitable power converter and the corresponding controller, continuous conveyance and dosing of granular materials have been provided for various operating conditions. In this way, the whole system power converter-power controller-vibratory actuator-vibratory feeder i.e. regulated vibratory conveying drive, has behavior of the controllable mechanical oscillator [6,7,8,9]. Operation of EMVF in the mechanical resonant range becomes favorable, because the final values of the oscillation amplitude can be obtained for relatively small energy of excitation Operation in this region is the most energy efficient, since the entire vibratory drive has minimal power consumption [10]. The control of frequency ensures operation of vibratory feeder in the region of mechanical resonance
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