· Due to the separating hood between the stator and the rotor, the motor windings are not located in the refrigerant circulation. · No shaft sealing and no cable glands to the motor, hence less danger of gas leakage. · No danger of damaging the motor windings even if the system has been contaminated. . No influence of the refrigerant and of oil on the motor windings. · All compressors are equipped with a vertical shaft and 2 or 3 symmetrically arranged cylinders. This construction ensures vibration-free operation. · The semi-open compressors are lubricated by a centrifugal pump. · Replaceable stators, available for single- and three phase motors.