Compressed air is indispensable for many industrial processes. However, it is also a very cost-intensive medium – and therefore offers significant potential for energy savings. As one of the world's leading manufacturers of machines for conveying and compressing air and special gases, AERZEN knows exactly what is required and develops innovative, high-end solutions for the key challenges facing the industry. The new oil-injected air compressors in the SI series are designed to strike an optimal balance between performance, efficiency, and economy, thereby significantly reducing energy consumption and operating costs.

High efficiency even at low speeds

The SI screw compressors feature an integrated PM (permanent magnet) motor and a clever, robust screw compressor stage with new, highly efficient 4+6 profiles. According to the manufacturer, the PM motor scores with high efficiency even at low speeds, achieving excellent energy efficiency of around 96 percent even in partial load operation. The rotor is directly connected to the compressor shaft, which prevents additional losses in the drive train. The required compressed air volume is adjusted as needed via a frequency converter (VFD). The optimally coordinated combination of a high-quality drive train and a highly efficient compressor stage results in particularly efficient operation of the entire package.

Robust design in a compact package

According to AERZEN, the new series is very robust and reliable, as well as compact in design. It is available in ten different sizes from 7.5 to 75 kilowatts and is used in numerous, sometimes demanding applications with differential pressures from 5.5 to 13 bar and volume flows from 20 to 756 cubic meters per hour. Pressure and operating temperatures are constantly monitored. This ensures stable and safe production processes. Thanks to the acoustically optimized sound enclosure, the double-walled oil cooling jacket for the PM motor and compressor stage, and the use of a radial fan, minimum sound pressure levels of 70 decibels (A) are achieved. Special accessories also enable these compressors to be operated at particularly high or low ambient temperatures, for example in polar regions or desert areas. In extreme climatic conditions, the oil cooler included in the standard scope of delivery increases the reliability of the unit in the long term.

Ease of servicing for reduced service costs

PM motor technology does not require any roller bearings. This eliminates the need for lubrication and the usual bearing replacement. The roller bearings of the compressor stages are designed for a service life of at least 30,000 hours, which further reduces maintenance and service costs. Cooling and lubrication are provided by a common oil circuit in the compressor and PM motor. The compact design ensures low space requirements and enables space-saving side-by-side installation. All components are accessible from both the front and rear, enabling convenient operation and easy maintenance.

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