Highest energy efficiency – even in partial load operation

The single-stage, oil-injected compressed air units of the new SI series from Aerzen achieve very high energy efficiency – even in partial load operation – thanks to an innovative screw compressor stage and a highly efficient permanent magnet motor of class IE5. This enables significant energy savings in compressed air generation and contributes significantly to economical, resource-saving, and sustainable processes.

Compressed air is indispensable for many industrial processes. However, it is also a very cost-intensive medium – and thus offers an important lever for energy savings. As one of the world's leading manufacturers of machines for conveying and compressing air and special gases, Aerzen knows these requirements precisely and develops innovative, high-end solutions for the key challenges facing industry. The new oil-injected compressed air compressors of the SI series optimally balance performance, efficiency, and cost-effectiveness, thus ensuring a significant reduction in energy consumption and operating costs.

Maximum energy efficiency

The SI screw compressors feature an integrated permanent magnet motor (PM motor) and an innovative, robust screw airend with new, highly efficient 4+6 profiles. The PM motor delivers high efficiency even at low speeds, achieving outstanding energy efficiency of approximately 96% even at partial load. The rotor is directly connected to the compressor shaft, thus avoiding additional losses in the drive train. The desired amount of compressed air is adjusted as needed using a frequency converter. The perfectly coordinated combination of the high-quality drive train and the highly efficient airend results in particularly efficient operation of the entire unit.

Unique reliability thanks to robust design in a compact unit

The new series is extremely robust, unrivaled in its reliability, and very compact. It is available in ten sizes from 7.5 to 75 kW and is used in numerous, sometimes demanding, applications with pressure differences of 5.5 to 13 bar and flow rates of 20 to 756 m³/h. Pressure and operating temperatures are continuously monitored. This guarantees stable and safe production processes. Thanks to the acoustically optimized sound enclosure, the double-walled oil cooling jacket for the PM motor and compressor end, and the use of a radial fan, extremely low sound pressure levels of at least 70 dB(A) are achieved. Special accessories ensure operation even in 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 sustainably increases the reliability of the unit.

Highly maintainable for reduced service costs

PM motor technology requires no rolling bearings at all. This eliminates the need for lubrication and the usual bearing replacement. The rolling bearings in the compressor stages are designed for a service life of at least 30,000 hours, further reducing maintenance and service costs. Cooling and lubrication are achieved through a shared oil circuit for both the compressor and the PM motor. The compact design results in a small machine footprint and allows for space-saving side-by-side installation. All components are accessible from the control panel and rear panel, ensuring easy operation and maintenance.

By the way: Investments in energy-efficient compressed air technology, such as the new Aerzen SI compressors, are supported by the government through the BAFA funding programs.