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At present, bridge connection of power elements is widely used for bipolar control of stepping motors. The disadvantages of this solution include a low range of speeds achieved at the set load for the step drive, a wide amplitude of phase voltage ripple and, as a consequence, high dynamic losses in the semiconductor converter and the wide amplitude of ripple of the torque generated by the electric drive. The described disadvantages, as well as the high value of reactive power component consumed by a stepping motor at high shaft speeds, make it reasonable to include additional inverters (one inverter per each phase of the electric motor) into the common conversion system; these inverters are supposed to compensate the reactive energy consumed by the stepping motor. The aim of this research work is to investigate the possible application of the double inverter system in the electric drive based on a stepping motor and the synthesis of the vector control algorithm of the stepping motor adapted for operation with this kind of the converter. The performance check and the performance evaluation of the proposed inverter system as compared with the common bridge system were carried out using the comparative simulation method in the Matlab/Simulink graphical environment. The simulation modeling results point at loss reduction in the converting part by 30%, reduction of the amplitude of the generated torque ripple and the increase in the shaft speed range during electric drive operation when the double inverter system was used with a comparatively lower voltage in the DC link. The suggested operation algorithm provides voltage control in the DC links of the additional inverters to decrease the amplitude of the voltage ripple on the motor windings and to reduce the dynamic losses in the converter. This converter can be used in autonomous industrial objects, autonomous robotic systems, airspace systems, etc.


Stepping motor, bridge converter, dual inverter system, autonomous voltage inverter, vector control, dual voltage inverters.

Tagir H. Abuzyarov

Postgraduate student, Electrical Equipment, Electric Drive and Automatics Department, Institute of Electric Power Engineering, R.E. Alekseev Nizhny Novgorod State Technical University, Nizhny Novgorod, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..


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