Compressor

1 . A compressor comprising:

a hermetic container having resonant frequency F;

a compression element accommodated in the hermetic container, the compression element being operable to compress refrigerant;

an electric element accommodated in the hermetic container, the electric element including a shaft rotating as to drive the compression element at a predetermined operation frequency; and

a rolling bearing accommodated in the hermetic container, the rolling bearing supporting the shaft rotatably, the rolling element including a plurality of rolling elements,

wherein the predetermined operation frequency of the electric element is different from operation frequency N expressed by a following formula:

N= 2· F /( n·R )

where n=1, 2 and R is a number of the plurality of rolling elements.

2 . The compressor according to claim 1 , wherein the rolling bearing comprises a thrust bearing.

3 . The compressor according to claim 1 , wherein the rolling bearing comprises a radial bearing.

4 . The compressor according to claim 1 ,

wherein the hermetic container has a space having the resonant frequency F, and

wherein the rolling bearing is provided at a node of resonance of the resonant frequency F in the space.

5 . The compressor according to claim 1 , wherein the compression element includes

a cylinder block providing a compression space arranged to compress the refrigerant therein, and

a bearing provided at the cylinder block and supporting the shaft.