Linear compressor

Abstract

The present invention relates to a linear compressor, and more particularly to, a linear compressor which employs a conductor member in a linear motor instead of a magnet to produce a driving force by electromagnetic induction. The linear compressor of the present invention includes a fixed member provided with a compression space, a movable member which linearly reciprocates inside the fixed member to compress refrigerant, one or more springs installed to elastically support the movable member in a motion direction, a stator composed of a first stator supplied with a current, and a second stator spaced apart from the first stator at a certain interval, a conductor member electromagnetically induced by a magnetic field produced by the stator to make the movable member linearly reciprocate, and a control unit which controls supply of the current with respect to the first stator.

1 . A linear compressor, comprising:
 a fixed member provided with a compression space;   a movable member which linearly reciprocates inside the fixed member to compress refrigerant;   one or more springs installed to elastically support the movable member in a motion direction;   a stator composed of a first stator supplied with a current, and a second stator spaced apart from the first stator at a certain interval;   a conductor member electromagnetically induced by a magnetic field produced by the stator to make the movable member linearly reciprocate; and   a control unit which controls supply of the current with respect to the first stator.   
     
     
         2 . The linear compressor of  claim 1 , further comprising a connection member which connects the movable member to the conductor member,
 wherein the conductor member is a conductor mounted on one end of the connection member.   
     
     
         3 . The linear compressor of  claim 1 , further comprising a connection member which connects the movable member to the conductor member,
 wherein the conductor member is formed by alternately stacking an annular iron piece and conductor, and mounted on one end of the connection member.   
     
     
         4 . The linear compressor of  claim 1 , further comprising a connection member which connects the movable member to the conductor member,
 wherein the conductor member is a conductor line wound around one end of the connection member.   
     
     
         5 . The linear compressor of  claim 1 , wherein the first stator comprises a coil winding body wound with a coil, and a core mounted on the coil winding body, and the control unit controls On and Off of current supply with respect to the coil winding body so as to produce a one-way magnetic field in the conductor member. 
     
     
         6 . The linear compressor of  claim 5 , wherein the springs comprise one or more of a first spring installed to elastically support the movable member in a refrigerant compression direction, and a second spring installed to elastically support the movable member in the opposite direction to the refrigerant compression direction. 
     
     
         7 . The linear compressor of  claim 1 , wherein at least some portion of the conductor member is positioned between the first stator and the second stator. 
     
     
         8 . The linear compressor of  claim 7 , wherein the first stator comprises first and second coil winding bodies spaced apart at an interval in an axial direction and wound with a coil, respectively, and a core mounted on the first and second coil winding bodies, and the control unit performs a control to supply currents having a phase difference to the first and second coil winding bodies to produce a two-way magnetic field in the conductor member. 
     
     
         9 . The linear compressor of  claim 8 , wherein the coil is wound around the first and second coil winding bodies in the same direction, and a capacitor is connected in series to one of the first and second coil winding bodies. 
     
     
         10 . The linear compressor of  claim 8 , wherein the control unit performs a control to supply currents having a phase difference of 90° to the first and second coil winding bodies. 
     
     
         11 . The linear compressor of  claim 8 , wherein the springs comprise a first spring installed to elastically support the movable member in a refrigerant compression direction, and a second spring installed to elastically support the movable member in the opposite direction to the refrigerant compression direction. 
     
     
         12 . The linear compressor of  claim 1 , wherein, when the movable member operates over a certain speed, a speed of the movable member and a force moving the movable member are inversely proportional at different ratios according to an amplitude of a load. 
     
     
         13 . The linear compressor of  claim 12 , wherein the control unit varies an amplitude of a voltage applied to the first stator according to the amplitude of the load. 
     
     
         14 . The linear compressor of  claim 13 , wherein the control unit varies the amplitude of the voltage so that the speed reduction of the movable member can be relatively small or the force moving the movable member can be substantially maintained or increase with the increase of the load. 
     
     
         15 . The linear compressor of  claim 12 , wherein the control unit varies a frequency according to the amplitude of the load. 
     
     
         16 . The linear compressor of  claim 15 , wherein the control unit varies the frequency so that the speed of the movable member can increase or the force moving the movable member can be substantially maintained or increase with the increase of the load. 
     
     
         17 . A linear compressor, comprising:
 a fixed member provided with a compression space;   a movable member which is provided with a conductor member, and linearly reciprocates inside the fixed member to compress refrigerant;   a plurality of springs installed to elastically support the movable member in a motion direction;   a first stator applied with a current to magnetically induce the conductor member;   a second stator positioned corresponding to the first stator so that at least some portion of the conductor member can be positioned in a space between the first stator and the second stator; and   a control unit which varies one or more of an amplitude and frequency of power applied to the first stator according to an amplitude of a load to control a cooling capacity according to the load.   
     
     
         18 . The linear compressor of  claim 17 , wherein, when the movable member operates over a certain speed, a speed of the movable member and a force moving the movable member are inversely proportional at different ratios. 
     
     
         19 . The linear compressor of  claim 18 , wherein the control unit varies the amplitude of the voltage so that the speed reduction of the movable member can be relatively small or the force moving the movable member can be substantially maintained or increase with the increase of the load. 
     
     
         20 . The linear compressor of  claim 18 , wherein the control unit varies the frequency so that the speed of the movable member can increase or the force moving the movable member can be substantially maintained or increase with the increase of the load.