Patent ID: 8628306

Claim:
A helium enclosed compressor in which a helium gas is used as a working gas, a compressor section, and a motor section including a stator having coil ends and a rotor are housed within an enclosed vessel, the inside of the enclosed vessel is partitioned into a discharge chamber and a motor chamber by a frame, the compressor section is adapted such that a stationary scroll having a spiral wrap standing upright at a first disk-like panel and an orbiting scroll having a spiral wrap standing upright at a second disk-like panel are made to mesh with each other while their wraps face the inside, and the orbiting scroll is made to orbit, thereby sucking the helium gas from a suction port of an outer peripheral portion of the stationary scroll, and discharging the helium gas into the discharge chamber from a discharge port of a central portion of the stationary scroll, and an inverter is provided to control the number of rotations of the motor section, wherein a plurality of varnish-treated layers which becomes insulatins films is formed on the surface of a coil which constitutes the coil ends, and a relationship between a stator external diameter and axial heights of the coil ends is Lm 1 /Ds=Lm 2 /Ds=0.26 to 0.30, when Ds is the stator external diameter, Lm 1 is the axial height of one of the coil ends, and Lm 2 is the axial height of the other one of the coil ends.