MOTOR OPERATED COMPRESSOR

The present disclosure relates to a motor operated compressor, including an orbiting scroll (1142) that defines a compression chamber (V) together with a fixed scroll (1141), and performs an orbiting movement with respect to the fixed scroll to compress a fluid; a main frame (1150) disposed to support the orbiting scroll to perform an orbiting movement and disposed at a side opposite to the fixed scroll around the orbiting scroll to define a back-pressure chamber (S4) together with the orbiting scroll; a groove (1142e) disposed in either one of the orbiting scroll and the main frame to face the other one of the orbiting scroll and the main frame, and defined in a closed curved shape around the back-pressure chamber; a first sealing member (1171) inserted into the groove to seal the back-pressure chamber; and a second sealing member (1172) inserted into the groove to elastically press the first sealing member to be brought into close contact with the orbiting scroll or the main frame, wherein a distance (a) between an outer wall of the groove and the first sealing member in a radial direction of the first sealing member is 6 to 8% (0.06 ≦ a/W ≦ 0.08) of a difference between an outer radius (OR) and an inner radius (IR) of the first sealing member (W = OR - IR).