US Patent 8628306 Helium enclosed compressor

Helium enclosed compressor. A compressor and a motor section with stator having coil ends and a rotor, are housed within an enclosed vessel partitioned into discharge and motor chambers by a frame. The compressor section has a stationary scroll having a spiral wrap standing upright at a disk-like panel and an orbiting scroll having a spiral wrap standing upright at a disk-like panel, made to mesh with each other while their wraps face the inside. The orbiting scroll sucks helium gas from a suction port of an outer peripheral portion of the stationary scroll, and discharges helium gas into the discharge chamber from a discharge port of a central portion of the stationary scroll. An inverter controls a number of rotations of the motor section, wherein a plurality of varnish-treated layers which becomes insulating films is formed on the surface of a coil which constitutes the coil ends.