Motor-operated compressor

Abstract

According to one embodiment, there is provided a motor-operated compressor comprising a rotation shaft, a first scroll configured to perform an orbiting motion and comprising an eccentric coupling portion eccentrically coupled to the rotation shaft, a second scroll coupled to the first scroll to form a pair of compression chambers, a rotor coupled to the rotation shaft, a stator forming an accommodation space configured to accommodate the rotor, and an eccentricity compensation portion configured to compensate for an eccentric displacement of a center of gravity of the rotation shaft, in response to the orbiting motion of the first scroll. The eccentricity compensation portion comprises a first member positioned on one end of the stator and a second member positioned on the rotor adjacent to the first member.

What is claimed is: 
     
         1 . A motor-operated compressor, comprising:
 a rotation shaft;   a first scroll configured to perform an orbiting motion and comprising an eccentric coupling portion eccentrically coupled to the rotation shaft;   a second scroll coupled to the first scroll to form a pair of compression chambers;   a stator forming an accommodation space;   a rotor coupled to the rotation shaft and disposed in the accommodation space, wherein the stator is configured to rotate the rotor by a magnetic interaction with the rotor; and   an eccentricity compensation portion configured to compensate for an eccentric displacement of a center of gravity of the rotation shaft, in response to the orbiting motion of the first scroll,   wherein the eccentricity compensation portion comprises:
 a first member positioned on one end of the stator; and 
 a second member positioned on the rotor adjacent to the first member. 
   
     
     
         2 . The motor-operated compressor of  claim 1 , wherein the first member extends along a circumferential direction of the stator, and
 wherein the second member has a magnetic property and is positioned at a position opposite to the eccentric coupling portion relative to a center of the rotor.   
     
     
         3 . The motor-operated compressor of  claim 2 , wherein the rotor comprises a plurality of magnetic members spaced apart from each other along a circumferential direction of the rotor, and
 wherein the second member is positioned to overlap at least one of the plurality of magnetic members in an axial direction.   
     
     
         4 . The motor-operated compressor of  claim 3 , wherein the rotor comprises:
 a rotor core comprising a magnetic member accommodation groove to accommodate the plurality of magnetic members therein; and   a rotor core extension portion formed on the rotor core and comprising a second member accommodation groove to accommodate the second member therein.   
     
     
         5 . The motor-operated compressor of  claim 4 , wherein the magnetic member accommodation groove and the second member accommodation groove extend in the axial direction. 
     
     
         6 . The motor-operated compressor of  claim 5 , wherein the magnetic member extends in the axial direction to form the second member. 
     
     
         7 . The motor-operated compressor of  claim 5 , wherein the rotor further comprises a separation member disposed between the magnetic member and the second member so that the second member and the magnetic member are spaced apart from each other in the axial direction. 
     
     
         8 . The motor-operated compressor of  claim 4 , wherein the rotor core extension portion is arranged eccentrically from the center of gravity of the rotation shaft. 
     
     
         9 . The motor-operated compressor of  claim 1 , wherein the stator comprises a first member coupling portion configured to couple the first member to the stator. 
     
     
         10 . The motor-operated compressor of  claim 9 , wherein the stator comprises:
 a stator core comprising a plurality of stacked plates;   a winding coil wound around the stator core; and   an insulator disposed on each end of the stator core configured to provide insulation between the winding coil and the stator core,   wherein the first member coupling portion is disposed on the insulator such that the first member is spaced apart from the stator core in an axial direction, and   wherein the second member extends in the axial direction to correspond to the first member.   
     
     
         11 . The motor-operated compressor of  claim 10 , wherein the insulator comprises an internal wall and an external wall that extend in the axial direction and face each other with the winding coil interposed therebetween, and
 wherein the first member coupling portion is disposed on the internal wall.   
     
     
         12 . The motor-operated compressor of  claim 1 , wherein the eccentricity compensation portion comprises:
 a first eccentricity compensation portion disposed at one side of the rotor and the stator, such that the first eccentricity compensation portion faces the first orbiting scroll; and   a second eccentricity compensation portion disposed at the other side of the rotor and the stator.   
     
     
         13 . The motor-operated compressor of  claim 12 , wherein a second member of the second eccentricity compensation portion is disposed at a position opposite to a second member of the first eccentricity compensation portion relative to the center of the rotation shaft. 
     
     
         14 . A motor-operated compressor, comprising:
 a fixed scroll;   an orbiting scroll coupled to the fixed scroll and configured to perform an orbiting motion relative to the fixed scroll;   a rotation shaft eccentrically coupled to the orbiting scroll;   a rotor coupled to the rotation shaft;   a stator surrounding an outer circumferential surface of the rotor;   a first member positioned on one end of the stator to extend along a circumferential direction of the stator; and   a second member comprising a material having a magnetic property, wherein the second member is positioned on the rotor adjacent to the first member, and at an opposite side to the orbiting scroll relative to a center of the rotor.   
     
     
         15 . The motor-operated compressor of  claim 14 , wherein the rotor comprises:
 a rotor core comprising a magnetic member accommodation groove configured to accommodate the plurality of magnetic members therein; and   a rotor core extension portion formed on the rotor core in an axial direction and comprising a second member accommodation groove to accommodate the second member accommodation groove therein.   
     
     
         16 . The motor-operated compressor of  claim 14 , wherein the stator comprises:
 a stator core comprising a plurality of stacked plates;   a winding coil wound around the stator core; and   an insulator disposed on each end of the stator core and configured to provide insulation between the winding coil and the stator core, the insulator being coupled to the first member,   wherein the second member extends in an axial direction to correspond to the first member.