Oil-Free Screw Air Compressor KOBELCO Emeraude ALE Ⅳ (55-120kW)

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ALE IV
emeraudale

Emeraude ALE IV [55 - 120kW]

The Future of Mid-Range Oil-Free Air Compressors

By optimizing energy efficiency across the entire system, we have set a new benchmark for energy consumption performance in this segment.
This mid-range oil-free compressor series is designed for the future, delivering outstanding efficiency and advanced technology.

Key Features:

✅ Best-in-class energy efficiency
✅ Certified Class 0 – 100% oil-free
✅ Extended overhaul interval
✅ Ultra-quiet operation
✅ Premium modern color touch screen

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High-Efficiency Motor (Fixed Speed: IE4, Inverter: IE5 Equivalent)

To maximize energy efficiency, the ALE IV series is equipped with high-efficiency motors.

  • Fixed-speed models use IE4 motors, delivering ultra-high energy efficiency.
  • Inverter models are equipped with IPM motors with ultra-high efficiency, equivalent to the IE5 standard.
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High-Efficiency Screw Rotor – Optimized Design

The new-generation rotor profile is designed based on advanced analytical technologies that KOBELCO has developed over many years—since the creation of Japan’s first oil-free screw air compressor in 1956.

Thanks to this improved design, KOBELCO has achieved best-in-class energy efficiency, driven by rotors optimized for high operating performance.

Key enhancements include:

  • Optimized inter-stage pressure balance
  • Reduced rotor clearances
  • Improved shaft sealing structure
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Overall Design to Minimize Energy Loss

The internal piping system, high-efficiency motor, and cooling fan are optimized to reduce power consumption.
In addition, the improved gas cooler lowers discharge air temperature and allows downsizing of auxiliary equipment such as air dryers.

✅ This solution not only saves energy 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 improved thanks to the IPM motor and optimized rotor design. The inverter compressor supplies the required air flow with optimized power consumption.

📊 Efficiency comparison chart:

Inverter models achieve over 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 losses.

⚙️ In contrast, fixed-speed models repeatedly switch between load and unload modes, causing larger pressure fluctuations and energy waste.

📉 Result:

Inverter models achieve up to 7% additional energy savings by eliminating excessive pressure fluctuations.