Investigation of Electromagnetic Drive of Vibratory Conveyor in Pre-resonant mode
DOI:
https://doi.org/10.33577/2312-4458.17.2017.9-14Keywords:
vibratory conveyor, electromagnetic drive, biharmonic oscillationsAbstract
The harmonic longitudinal oscillations and biharmonic normal oscillations with phase difference in vibratory conveying essentially increase the conveying velocity comparing with linear oscillations. But implementation of biharmonic oscillations requires the using of two vibratory drives with frequencies that differ in two times from each other. The electromagnetic drive may implement polyharmonic, in particular biharmonic oscillations in pre-resonant mode. The electromagnetic drive of vibratory conveyor in pre-resonant mode, when the frequency of natural oscillations is greater than the frequency of forced oscillations, is investigated. Formulas of amplitudes and phase difference of the first and the second harmonics of oscillation dependence on the frequency of natural oscillations are derived. Frequency and phase response of the electromagnetic vibratory drive are built. It is determined the natural frequency value at which optimal biharmonic oscillations are implemented.
To testify theoretical results the experimental investigations were carried out on a special installation. The body of electromagnet was mounted on a massive plate. The anchor of electromagnetic drive was fastened with two flat leaf springs as well as the bracket with acceleration sensor. Exchange of frequency of natural oscillations was achieved by changing of springs’ length. The amplitudes of oscillations were regulated with aid of auto-transformers. The electromagnet was connected to the power supply using half-wave rectifier (diode), so the forced oscillations were implemented with frequency 50 Hz. Sensor readings were recorded on the wave-forms from which amplitudes and phase difference of harmonics were determined by equidistant ordinates method. The comparison of theoretical and experimental investigations shows the sufficient agreement.
The using of biharmonic oscillations of the working track of vibratory conveyor in direction perpendicular to the conveying track is possible at a certain natural frequency without increasing of conveyor’s design complexity.References
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