Abstract: A compressor unit including a compressor is provided. The compressor unit includes a suction line and a discharge line, a control unit which controls the compressor and/or adjacent modules. A method to operate a compressor unit is also provided. To avoid any damage caused by non-gaseous fluid amount at least one detection device is disposed in the suction line to identify non-gaseous fluid amounts in the fluid to be compressed before entering the compressor. The detection device is connected to the control unit in a signal transmitting manner.

Abstract: The invention relates to a drive system comprising a liquid-cooling electric machine (1), and to a method for liquid-cooling the stator winding of said type of machine (1). In order to use said system at very low temperatures and in the most simple way possible, said drive system also comprises a cooling circuit (2) for cooling the liquid of a stator winding of the electric machine (1), a pump (3) for pumping a liquid through the coolant circuit (2), a converter (4) for feeding the stator winding and a control device (5) for controlling the converter in such a manner that said converter, prior to activating the pump (3), feeds a heating flow to the stator winding for heating the cool liquid.

Abstract: A compressor unit including a compressor is provided. The compressor unit includes a suction line and a discharge line, a control unit which controls the compressor and/or adjacent modules. A method to operate a compressor unit is also provided. To avoid any damage caused by non-gaseous fluid amount at least one detection device is disposed in the suction line to identify non-gaseous fluid amounts in the fluid to be compressed before entering the compressor. The detection device is connected to the control unit in a signal transmitting manner.