This paper deals with oscillating linear synchronous pulsating current motor compressor drive supplied by sinusoidal and rectangular voltage. While creating mathematical model of the motor for investigation, Matlab software was used for solving of differential equations. Modeling results while supplying motor by sinusoidal and rectangular voltage and changing firing angle a of thyristor, frequency of voltage f and a load R. Characteristics and energetic parameters of oscillating linear pulsating current motor were obtained and analyzed. Ill. 10, bibl. 6, tabl. 2 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.110.4.278

This study is focused on the efficiency of automated transferring system of packages equipped by variable-frequency drive (VFD) and servo drive motor. It was found that rotation frequency of induction motors and linear speed of servo drive decisively affected the unit efficiency that operates in the periodic mode. The system duty cycle was divided in two separate parts taking into account time spans needed to complete the specific tasks by each separate equipment of the system. In order to reduce the power usage of the system, the duration of each part of cycle was extended. Lowered electricity consumption leads to the extension of each cycle’s stage operating times. Frequencies of motors and linear speed of servo drive motors were optimized depending on cycle stages duration. Optimized frequency and linear speed values were calculated and loaded into motors controllers, and the efficiency of each separate equipment was measured, as well as total efficiency of the system. Experimental system debugging using optimized parameters proved that system efficiency increases up to 60 %, and that is closely matched with calculated values.

This paper deals with the control efficiency analysis of the linear oscillating mechatronic device (linear oscillating synchronous motor–compressor). These mechatronic devices can be controlled by using thyristor control [1, 4], square-wave voltage [2, 3], ect. There is analyzed the case, when square-wave voltage pulses’ frequency is changed and so the piston stroke duration time is reduced. The control of piston stroke changes the energetic parameters of the mechatronic device. This type of controlling has one disadvantage – it needs a DC voltage source. The pulsating voltage control is based on thyristor control system and does not have the previously mentioned disadvantage, because uses the AC voltage source, but both control ways have influence to the energetic parameters due to higher harmonics. The analysis of the chosen mechatronic device (open-loop tests) is based on comparing the modeling and experimental results with respect to power losses, simplicity of the control, power factor and disturbances to the supply system. These results are important for the optimal design of the drive with oscillating synchronous pulsating current motors and the selection of control type for the different type of load.