Abstract: An electric motor is described, and a compressor inside a motor shell filled with high pressure gas is driven by the motor. Inside a shell cavity, a rotor is rotatable with respect to a stator about a rotor axis extending through a shell opening. A shield fastened to the shell body closes the shell opening. Rigid connecting means are provided for connecting the stator windings with an electric power source, and they comprise a conductive rod extending through the shell, and specifically through the shield. A first terminal is rigidly associated to the conductive rod, and a second terminal is rigidly connected to the stator windings. The first and second terminals electrically connect the stator windings with the conductive rod.