Akademik Veri Yönetim Sistemi
Journal of the Brazilian Society of Mechanical Sciences and Engineering, cilt.46, sa.2, 2024 (SCI-Expanded, Scopus)
It is desirable to operate linear compressors close to their natural frequency with the help of a mechanical spring. By this way, the required current values are kept to a minimum while obtaining a smooth oscillation. On the other hand, the force applied by the compressed gas on the piston varies nonlinearly depending on the compressor’s compression ratio and gas flow rate. This affects the natural frequency of the oscillation. In this study, it is aimed to examine the effect of the change in the operating frequency on the electrical characteristics and efficiency of the motor. For this purpose, the linear compressor is modeled with the lumped parameter approach. Structural electrical properties of the compressor such as winding resistance, inductance and motor emf constant were taken from a sample compressor and kept at constant value. In the simulation studies, the electrical behavior of the motor and the dynamic behavior of the piston were examined by feeding the system with voltage at different frequencies and amplitudes for different pressure ratios and compressor capacities. For each operating condition, the electrical efficiency of the motor was calculated, and the variation of magnetic force, current and voltage was determined. The results show that the operating frequency strongly affects the maximum voltage and current values, and the appropriate frequency changes with the pressure and capacity. The study reveals that adjusting the operating frequency can enhance efficiency by up to 10% under low-pressure rates and partial loads.