Oil-Free Screw Air Compressor KOBELCO EMERAUDE ALE-IV (132-400kW)

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Emeraude ALE IV [132 - 400kW]

The Premium Air Compressor Series – Ultimate Energy Efficiency from KOBELCO

By developing an advanced air-end and an optimized overall machine design, KOBELCO has achieved industry-leading energy efficiency while ensuring maximum durability.
This series sets a new benchmark for oil-free air compressors.

Key Features:

✅ Lowest energy consumption per m³ of air in its class
✅ Class 0 certified – 100% oil-free
✅ Extended overhaul interval
✅ Ultra-quiet operation
✅ Premium color touch screen with intuitive operation

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Air End

High-Efficiency Rotor – New Energy-Optimized Design

The new-generation rotor is designed based on advanced analytical technology—an engineering foundation that KOBELCO has been developing since 1956, when it introduced Japan’s first oil-free air compressor.

Key improvements include:

  • Optimized inter-stage pressure balance
  • Reduced rotor clearances
  • Improved shaft sealing structure
Oil Free Air Compressor

Optimized Design – No Energy Waste

With optimized internal piping, high-efficiency motors, and high-performance cooling fans, KOBELCO reduces overall power consumption. In addition, the optimized gas cooler lowers discharge air temperature, allowing a reduction in the size and number of auxiliary equipment such as air dryers.

➡️ This design saves energy not only for the compressor itself, but also for the entire clean compressed air system.

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Outstanding Part-Load Efficiency – Inverter Models

Part-load operating efficiency is significantly enhanced by the IPM motor and optimized rotor design. The inverter compressor delivers the required air flow with optimized power consumption.

📊 Efficiency comparison chart:

Inverter models achieve more than 26% energy savings compared to fixed-speed compressors.

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Stable Pressure Control – Maximum Energy Savings

Inverter models maintain pipeline pressure at a low and stable level (within ±0.01 MPa), minimizing energy loss.

⚙️ In contrast, fixed-speed models repeatedly switch between load and unload modes, resulting in larger pressure fluctuations and unnecessary energy consumption.

📉 Result:

Inverter models save up to 7% more energy by eliminating excessive pressure fluctuations.