Direct-drive rotary screw compressors

Rotary screw compressors with 1:1 direct drive for industrial compressed air

Rotary screw compressors transfer the motor’s power directly to the compressor stage and are designed for professional applications with regular to continuous compressed air requirements. In this category, you’ll find stationary models on a base frame as well as variable-speed versions with 1:1 direct drive.

The current product range covers drive power from 11 to 90 kW. Depending on the model, operating pressures of 8 or 10 bar and flow rates ranging from approximately 1.3 to 15.4 m³/min are available. For proper sizing, the actual air demand, required supply pressure, load profile, and potential peak demands are more important than motor power alone.

Selecting the Right Direct Drive

✅ Constant speed—for consistent and easily predictable compressed air demand

✅ Variable-speed – for significantly fluctuating purchase volumes

✅ 8 or 10 bar – Select the operating pressure based on the end user and piping system

✅ 11 to 90 kW – wide power range for professional compressed air stations

Schraubenkompressoren mit 1:1 Direktantrieb auf Basisgestell
Rotary screw compressors with 1:1 direct drive on a base frame
Schraubenkompressoren mit 1:1 Direktantrieb und Drehzahlregelung auf Basisgestell
Rotary screw compressors with 1:1 direct drive and speed control on a base frame
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Properly Sizing Direct-Drive Rotary Screw Compressors

Rotary screw compressors with 1:1 direct drive are available in the current product line for professional compressed air systems ranging from 11 to 90 kW. The category includes fixed-speed D models and variable-speed DV models. Both series are offered on a base frame and cover operating pressures of 8 or 10 bar.

The available flow rates range from approximately 1.3 m³/min at 11 kW to 15.4 m³/min at 90 kW. To ensure the correct selection, do not simply choose the next higher motor power rating. The starting point is the air demand of the connected equipment at the actual required system pressure.

1:1 direct drive as a Drive Concept

With direct drive, power is transmitted without the belt drive used in the other main series. For buyers, it is particularly important that the drive concept, power range, and operating profile match the planned compressed air station. The category is therefore intentionally separated from the belt-driven rotary screw compressors.

D Series for predictable compressed air needs

The fixed-speed D models range from 11 to 90 kW. Depending on the power rating, flow rates ranging from 1.3/1.5 m³/min to 13.4/15.4 m³/min are available at 8 or 10 bar. They are particularly suitable when air demand remains relatively constant over extended operating periods.

DV Series with Speed Control

The variable-speed DV models cover the same power range from 11 to 90 kW. Speed control allows for adaptation to fluctuating demand within the specified operating range. Whether this is energetically and technically feasible depends on the actual load profile.

Select direct drive

✅ 11 to 90 kW drive power

✅ 8 or 10 bar operating pressure

✅ Fixed-speed D Series for predictable demand

✅ Variable-speed DV Series for variable output

Plan air receivers and treatment systems separately

The direct-drive models listed here are mounted on a base frame. Air receivers, drying, filtration, and condensate treatment are therefore sized separately according to the specific system. This allows for flexible integration into new or existing compressed air systems.

Buy a direct-drive rotary screw compressor

When selecting a direct-drive rotary screw compressor, the flow rate, operating pressure, load profile, and existing peripheral equipment should be considered together. The subcategories distinguish between fixed-speed and variable-speed models, ensuring that the search is tailored to the appropriate system configuration.

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