Abstract
Purpose. Investigate the influence of the half-wave and aperiodic inductor excitation pulse on the efficiency and thermal processes of a magnetic-pulse press operating in a cyclic mode. Experimentally establish the influence of the number of operating cycles on the indicators of pulsed pressing of ceramic powders. Methodology. With the help of a mathematical model, the thermal processes of a magnetic-pulse press of cyclic action with aperiodic and half-wave excitation pulses of an inductor winding depending on the number of excitation pulses are investigated. Experimental studies of samples formed of ceramic powders with a different number of power pulses were carried out on a model magnetic pulse press. Results. A mathematical model of a magnetic-pulse press of cyclic action has been developed, which at each working cycle calculates a complex of interconnected electromagnetic, mechanical and thermal processes. It has been established that during cyclic operation the temperature of the armature is higher than that of the inductor winding. With a significant period of pulse repetition during a pause, the temperature rise of the inductor increases slightly, and the anchors decrease markedly. Experimental studies on a model magnetic pulse press at each working cycle provided a force pressure pulse on a ceramic powder with amplitude of 85 MPa and a duration of 1 ms. Originality. It is established that the temperature rise of the inductor in a press with an aperiodic excitation pulse and full discharge of the capacitive drive is higher than when using a half-wave inductor excitation pulse and saving part of the energy in the drive during the entire cyclic process. Temperatures of the armature are almost the same. It is established that pulse pressing allows to obtain samples, the density of which is 12% higher than the density of samples obtained by static pressing. Practical value. It is shown that an increase in the number of power pulses compacts the ceramic powder, increasing the mechanical strength of the sample, reducing its porosity and water absorption
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Schedule a callMore From: Bulletin of NTU "Kharkiv Polytechnic Institute" Series: Electrical Machines and Electromechanical Energy Conversion
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