Patent ID: 8033795

Claim:
A linear compressor ( 100 ) applicable to a cooling system ( 20 ), the linear compressor ( 100 ) comprising: a piston ( 1 ) driven by a linear motor ( 10 ), the piston ( 10 ) having a displacement range controlled by a controlled electric voltage (V M ), the controlled electric voltage (V M ) having a voltage frequency (F VM ) applied to the linear motor ( 10 ) and adjusted by a processing unit ( 22 ), wherein the controlled voltage (V M ) generates a feed current (i A ) that circulates in the linear motor ( 10 ); wherein the processing unit ( 22 ) of the linear compressor ( 100 ) dynamically controls the range of piston ( 1 ) displacement as a function of the variable demand of the cooling system ( 20 ), the linear compressor ( 100 ) having a resonance frequency, wherein the processing unit ( 22 ) adjusts a range of piston displacement so that the linear compressor ( 100 ) is dynamically kept in resonance throughout variations in demand of the cooling system, the control of the displacement of the piston being made by means of the controlled voltage (V M ) that is adjusted by means of a variable frequency inverter, the inverter dynamically adjusting the voltage frequency (f VM ) of the controlled voltage (V M ) to a value equal to the value of the resonance frequency of the linear compressor ( 100 ) as the variations in demand of the cooling system ( 20 ) occur, wherein: said processing unit ( 22 ) measures a feed phase (φ c ) of the feed current (i A ) and the dynamic phase (φ P ) of the piston ( 1 ) of the linear 100, and said processing unit ( 22 ) measures a difference between the feed phase (φ C ) and the dynamic phase (φ P ) and establishes a measured phase (φ PC ) according to measured phase (φ PC )=dynamic phase (φ P )−feed phase (φ C ) said processing unit ( 22 ) adjusts the controlled voltage (V M ) so that the value of the measured phase (φ pc ) will be null; said range of piston displacement is adjusted according said variations in demand of the cooling system, wherein said variations in demand are detected by changes in said resonance frequency of said linear compressor ( 100 ) as indicated by changes in said measured phase (φ PC ), without reference to an external variable.