Recently linear compressor with a free piston is widely paid attention to for its high efficiency. This paper presents parameters optimization of linear compressor used for Refrigerator. The system equations of linear compressor are established through system analysis and solved by variable step Newmark method. The piston movement, current, input power, effective work, resistive loss, damping loss and efficiency are calculated for the optimization from the system equations. Coil wire diameter, stroke and cylinder diameter are important parameters of linear compressor, which have great importance on its performance. The coil wire diameter was changed to find out its affect to loss of resistance. The efficiency of linear compressor and current of the coil are analyzed with the same exhaust volume and different stroke and cylinder diameter. Through the analysis the parameters of the linear compressor are optimized.

Parameters Optimization of Linear Compressor for Refrigerator

Based on equivalent linear treatment of the gas force load, the mathematical model of motor system was established. Then, the effect of gas force load and operating frequency on the power factor was investigated. The predicted analysis was validated by corresponding experimental and simulated results. The results shown that maximum power factor is obtained when the operating frequency near the mechanical resonant frequency. But the two frequency points are not equal, and the offset has relationship with gas force load. In order to improve the power factor when operating frequency is near the mechanical resonant frequency, the linear model of actual system with compensation capacitor was also researched on the basis of detailed study.

A study on power factor of linear oscillatory motor with two separated stators

Main effect factors on the power factor of driving motor used for linear compressor were analyzed to ensure high motor performance,including radian frequency ratio and damping ratio.Linear processing of the mathematical model describing mechanical system,electromagnetic system and thermodynamic system was carried out to simplify the calculation.Calculation and experimental results showed that operating frequency and damping ratio were the most important effect factors;the maximum power factor was obtained when operating frequency was near the mechanical resonant frequency;high power factor section was enlarged with increasing damping ratio.The experimental results agreed well with the analytical solutions when the piston was with load or without.All the highest power factors were above 0.96.

WU Rong-ren

Papers

Power factor analysis of driving motor for linear compressor