Variable-Speed Rotary Screw Compressors

Variable-speed rotary screw compressors for variable compressed air demand

Variable-speed rotary screw compressors adjust their air delivery within their control range to match the current compressed air demand. This is particularly useful for applications where air consumption fluctuates significantly throughout the day or during production. In this category, you will find variable-speed models with belt drives as well as 1:1 direct drives.

The available series range from 11 to 90 kW and cover flow rates from approximately 1.3 to 15.4 m³/min. Depending on the drive concept, pressure ranges up to 10 bar are available. A realistic load profile is crucial for proper system design: continuous demand, typical partial load, peak consumption, and desired system pressure should all be considered together.

When is speed control useful?

✅ in cases of highly fluctuating compressed air consumption

✅ when long partial-load phases occur

✅ for demand-based adjustment of the flow rate

✅ Available with belt drive or 1:1 direct drive

Schraubenkompressoren auf Basisgestell mit Riemenantrieb und Drehzahlregelung
Rotary screw compressors on a base frame with belt drive and speed control
Schraubenkompressoren auf Basisgestell mit 1:1 Direktantrieb und Drehzahlregelung
Rotary screw compressors on a base frame with 1:1 direct drive and speed control
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Variable-speed rotary screw compressors for fluctuating air demand

Variable-speed rotary screw compressors are ideal for compressed air systems where demand is not constant. The speed is used to adjust the generated flow rate within the specified control range to meet current demand. The product line includes both belt-driven FV models and direct-driven DV models.

The total power range for this category extends from 11 to 90 kW. The DV series starts at 11 kW, while the FV series is available from 30 to 90 kW. This allows for the coverage of both medium and large-scale industrial compressed air needs.

Speed control is a matter of the load profile

A variable speed is particularly useful when air consumption fluctuates significantly throughout the workday. If the same air volume is required almost constantly, a fixed-speed solution should also be considered. For a reliable selection, typical minimum consumption, normal operation, and peak demand are therefore more important than a single maximum value.

FV Series with Belt Drive

The variable-speed FV models range from 30 to 90 kW. Depending on the model, pressure ranges of 5–8 or 5–10 bar and flow rates of approximately 4.6 to 14.7 m³/min are available. This product group combines belt drive and variable speed.

DV Series with 1:1 direct drive

The DV series is available from 11 to 90 kW and operates at 8 or 10 bar. The flow rates in the current product line range from approximately 1.3 to 15.4 m³/min. This means that, within the variable-speed category, a direct-drive model is also available for a very wide power range.

For the design, record

✅ Base load of the compressed air network

✅ Typical partial-load phases

✅ Short-term consumption spikes

✅ Required supply pressure and pressure losses

✅ Existing storage and compressed-air treatment

Belt drive or direct drive with speed control?

Both drive concepts have their own subpages in this category. This allows users to first select the desired drive and then filter by power, pressure, and flow rate. The decision should be integrated into the overall design of the compressed air station.

Buy a variable-speed rotary screw compressor

Anyone looking to purchase a variable-speed rotary screw compressor should have as realistic an understanding as possible of the facility’s load profile. ABS Strahltechnik provides support in choosing between variable-frequency (VF) and variable-displacement (VD) designs, as well as in optimizing flow rate, operating pressure, and power reserve.

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