Helium enclosed compressor

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 Lm1/Ds=Lm2/Ds=0.26 to 0.30,
• when Ds is the stator external diameter, Lm1 is the axial height of one of the coil ends, and Lm2 is the axial height of the other one of the coil ends.