Compressor

Abstract

A compressor includes a closed container, a compression element placed within the closed container, and a motor placed within the closed container to drive the compression element via a shaft. An integral structural part is formed by integrally assembling a compression element with a rotor via a shaft. The natural frequency of the integral structural part is larger than five times the maximum number of rotations of the compressor during its operation. A coil of a stator is provided in concentrated winding. A cylindrical-shaped rotor core of the rotor has a small-diameter portion and a large-diameter portion provided inside the rotor core. The shaft is fixed to the small-diameter portion of the rotor core. A bearing of the compression element is arranged to support the shaft and is inserted into the large-diameter portion of the rotor core, with the shaft being cantilevered by the bearing.

1 . A compressor comprising:
 a closed container;   a compression element placed within the closed container; and   a motor placed within the closed container to drive the compression element via a shaft,   the compression element and the motor being arranged and configured such that an integral structure part is formed by integrally assembling the compression element and a rotor of the motor via the shaft,   a coil of a stator of the motor being provided in concentrated winding,   a cylindrical-shaped rotor core of the rotor having a small-diameter portion and a large-diameter portion provided inside the cylindrical-shaped rotor core,   the shaft being fixed to the small-diameter portion of the cylindrical-shaped rotor core,   a bearing of the compression element being arranged to support the shaft and being inserted into the large-diameter portion of the cylindrical-shaped rotor core, with the shaft being cantilevered by the bearing, and   the integral structure part having a natural frequency larger than five times a maximum number of rotations of the compressor during operation.   
   
   
       2 . The compressor according to  claim 1 , wherein
 a refrigerant in the closed container is carbon dioxide.   
   
   
       3 . (canceled)