| 摘要 |
To obtain long-term reliability of a heat pump apparatus by using an insulating material that is less liable to be hydrolyzed even when a refrigerating machine oil having high hygroscopicity and a high water content in oil is used, an electric motor (6) of a compressor (1) includes: a stator (6s) fixed to a sealed container (10) with a winding (6w) being wound around the stator (6s) through intermediation of an insulating material (7); and a rotator (6r) surrounded by the stator (6s). The insulating material (7) includes wholly aromatic liquid crystal polyester (LCP) containing, as an essential component, p-hydroxybenzoic acid (PHB) as a monomer and having a main chain of a molecule formed by linking p-hydroxybenzoic acid and, as another monomer, only a monomer having a benzene ring, through an ester bond. A saturated water amount of the refrigerating machine oil is 1 % or less at 40 degrees Celsius and a relative humidity of 80%. |
