Open AccessExperimental and Theoretical Investigation of Nonlinear Dynamic characteristics in an Oil-free Moving Coil Linear Compressor
Author(s) -
Jian Sun,
Chengzhan Li,
Jianguo Li,
Jinghui Cai
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/758/1/012086
Subject(s) - waveform , piston (optics) , distortion (music) , current (fluid) , total harmonic distortion , mechanics , displacement (psychology) , acoustics , nonlinear system , alternating current , gas compressor , control theory (sociology) , materials science , voltage , physics , optics , thermodynamics , computer science , control (management) , quantum mechanics , artificial intelligence , psychology , amplifier , optoelectronics , cmos , wavefront , psychotherapist
The gas pressure, piston displacement and current response characteristics of an oil-free moving coil linear compressor driven by sinusoidal voltages at different frequencies have been experimentally studied. The results show that the response curves of gas pressure, piston displacement and current have nonlinear distortions deviating from the sinusoidal waveform. Among them, the piston displacement waveform has relatively small deviation from sinusoid, and the total harmonic distortion rate (THD) of piston displacement has a maximum value of 6.2% at 50Hz; the current waveform has relatively large deviation from sinusoid, and the THD of current has a maximum value of 73.7% at 60Hz. At this time, the current has two peaks in one cycle. It was analyzed that the nonlinear distortion of displacement and current occurs only in the compression process in a working cycle. In addition, a nonlinear dynamic model based on MATLAB software was established to analyze current distortion. The simulated values of gas pressure, piston displacement and current curves have a good coincidence with measured values. Finally, it is present that the severe distortion of the current curve is mainly caused by the non-linearity of the gas pressure.