Abstract: As a new type of compressor，linear compressor has the advantages of high efficiency，small

volume，low noise and little vibration. However，in order to give full play to its advantages of high efficiency，it is

necessary to control the driving frequency to track its mechanical resonance frequency. According to this

characteristic，a frequency tracking control algorithm of linear oscillation motor based on second-order generalized

integrator（SOGI）and double correlation phase detection algorithm was proposed. Compared with the frequency

tracking control algorithm based on the average value of stroke-current product（ASCP），the control algorithm has the advantages of fast dynamic response and stable operation under variable working conditions，enhances the

suppression effect of external interference and improves the stability of the control system. Simulation and

experiments show that the proposed control algorithm can quickly track the natural frequency of the motor，which

verifies the rationality and effectiveness of the theory.

      Key words: resonant frequency tracking；linear compressors；second-order general integrator（SOGI）；phase

detection algorithm