Compressor assembly comprising a motor driving one or more compressor rotors and method for fabricating a housing part of such a compressor assembly

A compressor assembly comprising a motor which drives one or more compressor rotors of a compressor element, comprising an oil circulation system for cooling and lubricating components of the compressor assembly, wherein the oil circulation system comprises an oil reservoir, an oil cooler for cooling oil circulating through the oil circulation system, and an oil filter for filtering oil flowing through one or more lines of the oil circulation system, wherein the motor has a motor housing comprising a central motor housing body executed as a motor jacket in which channels are provided which are connected to oil lines of the oil circulation system for circulating oil through the motor jacket, and wherein the oil circulation system comprises an oil-pump for providing driving force for circulating oil through oil lines of the oil circulation system from the oil reservoir to said components of the compressor assembly and back to the oil reservoir, and the channels in the motor jacket extend in axial directions parallel to the axial direction of a motor shaft of the motor,

• wherein the oil circulation system of the compressor assembly comprises at least a first circulation loop and a second circulation loop wherein oil is circulating between the oil reservoir and the oil cooler and back, wherein the first circulation loop is an unfiltered circulation loop wherein no oil filter is included and the second circulation loop is a filtered circulation loop in which the oil filter is provided for filtering the oil and wherein one or more channels in the motor jacket are included in the first unfiltered circulation loop, which channels form cooling channels for cooling of the motor housing jacket.