Cherno O. Energy efficient controlled electromagnetic drive systems of vibration equipment. Theory and practice.

The dissertation solves a topical scientific and applied problem of development of scientific bases of creation, modeling and optimization of electromagnetic drive systems of vibration equipment with frequency and amplitude control for their energy efficiency increase. For this purpose a scientific generalization of the principles for constructing technological vibration systems with an electromagnetic drive is made, methods for their analysis and automatic control are developed. The circuit-field method of modeling processes in electromagnets was further developed in terms of approximating the results of numerical calculations of the magnetic field, which made it possible to increase the accuracy of modeling processes in electromagnets, in particular when determining the most energy-efficient operating modes. It has been proven and scientifically substantiated that the maximum efficiency of the drive system is observed at a frequency 1 ... 5% lower than the frequency of mechanical resonance. The method for controlling the frequency and amplitude of electromagnetic vibration drive systems has been further developed in terms of ensuring the vibration devices control systems stability for to the influence of higher harmonic components of vibration due to the use of the discrete Fourier transform algorithm when calculating amplitudes and phase differences. A new method is proposed for controlling the frequency of electromagnetic vibration drive systems by the phase difference between the harmonic components of the electromagnet winding current without using information about the movement of the working body of the device, which makes it possible to provide an energy efficient operation mode for a wider class of vibration equipment, in particular, devices where the movements of the working body and the electromagnet anchor do not match.