A closed motor-driven compressor includes a closed vessel containing a lubricating oil collected in a bottom portion thereof, a compression section accommodated in the closed vessel, and a motor section accommodated in the closed vessel for driving the compression section. The fluid-collecting chamber includes a dose-control portion which encompasses a volume defined by two dimensions. The linear actuator assembly is operable to laterally translate the steering rack. In a preferred embodiment, the apparatus further comprises a torque generator including a maximum output torque controlling device.