Study on Frequency Characteristics of Linear Refrigerator Compressor

In order to design high performance and reliability linear refrigerator compressors, the factors influencing the natural frequency of the linear compressor were analyzed theoretically, and experimental study on operating characteristics of different discharge pressure and operation frequency were conducted. The results show that the natural frequency of the linear compressor is influenced by not only mass of moving parts and spring stiffness but also discharge pressure and piston stroke, and the natural frequency increases with the discharge pressure. At the different discharge pressure and operation frequency, the compressor has the minimum working current and input power, and higher efficiency when the operation frequency being close to the natural frequency. In designing the linear refrigerator compressor, the operation frequency should be equal to the natural frequency at the rated operating condition for obtaining high performance of the linear compressor.