Linear compressor

A method for controlling a linear compressor which includes a fixed member having a compression space therein, a movable member provided in the fixed member to compress a refrigerant sucked into the compression space, one or more springs provided to elastically support the movable member, and a motor unit including a motor connected to the movable member to linearly reciprocate the movable member in an axial direction and a capacitor connected in series to the motor, the method comprising:

• a first step of applying a preset initial voltage to the motor;
• a second step of calculating a first attenuation voltage with a current produced by the application of the preset initial voltage;
• a third step of calculating a first required voltage corresponding to a difference between the initial voltage and the first attenuation voltage;
• a fourth step of applying the first required voltage to the motor;
• a fifth step of calculating a second attenuation voltage with a current produced by the application of the first required voltage;
• a sixth step of calculating a second required voltage corresponding to a difference between the initial voltage and the second attenuation voltage;
• and
• a seventh step of applying the second required voltage to the motor, and
• wherein the second step or the fifth step integrates the current and calculates the first or second attenuation voltage by multiplying the integrated value by a variable constant 1/Cr, wherein Cr is a capacitance.