EP-CMW3.7-0.8 Oil-Free Scroll Air Compressor
The EP-CMW3.7-0.8 delivers 415 L/min of certified oil-free compressed air at 0.8 MPa via a 3.7 kW permanent magnet scroll drive — the preferred mid-range solution for food processing, precision machining, and medical facility central air supply where air purity and low noise are equally critical.
EP-CMW3.7-0.8: 3.7 kW Oil-Free Scroll Compressor for Mid-Scale Industrial Clean Air Demands
Positioned between the entry-level 2.2 kW unit and higher-power multi-scroll configurations, the EP-CMW3.7-0.8 oil-free scroll air compressor addresses the needs of operations that have outgrown a small laboratory compressor but do not yet require a full multi-head system. Running on a 3.7 kW (5 HP) inverter-driven permanent magnet motor, this model produces 415 L/min of structurally oil-free air at working pressures from 0.2 to 0.8 MPa -- a 63% increase in air volume over the 2.2 kW model while maintaining the same scroll compression architecture, direct-drive configuration, and stainless steel outlet specification. Noise is rated at 52 +/- 3 dB(A), and the unit weighs 150 kg with dimensions of 720 x 680 x 1050 mm.
This model is routinely specified for food packaging lines requiring BRC-compliant clean air, multi-chair dental suites, CNC machining centres needing pulse-free tool-change air, and precision spray coating operations where oil-contamination-induced defects create costly rework cycles. Its air-end module is forward-compatible with Ever Power's multi-air-end cabinet system, making it a scalable investment for growing operations. Review the full EP-CMW product family to understand where this model sits across the complete power range.
Ever Power Manufacturing and Standards Authority
Ever Power's scroll compressor platform was designed as an entirely original architecture rather than an adaptation of existing technologies. The engineering team contributed to the drafting of national industry standards JB/T 11882-2014 and JB/T 12565-2015, and achieved the distinction of manufacturing the world's first 1.2 MPa oil-free scroll air compressor -- a milestone that required solving heat dissipation and structural rigidity challenges at a pressure level no other manufacturer had addressed. The EP-CMW3.7-0.8 benefits directly from this engineering depth: its scroll profiles, housing stiffness, and motor integration reflect the same design discipline applied to the highest-pressure units in the range. The 2-year air-end warranty applies unconditionally across all CMW variants including this model.
Key Technical Features of the EP-CMW3.7-0.8
World-First High-Stiffness Air-End at 3.7 kW
The square-profile, high-rigidity scroll housing reduces flex under pressure cycling -- a characteristic that directly extends tip seal service intervals, maintains volumetric efficiency over time, and enables the unconditional 2-year air-end warranty at this power level.
3.7 kW VSD Permanent Magnet Motor -- Over 94% Efficiency
The built-in variable speed drive enables soft-start with zero inrush current, automatic speed adjustment to match air demand, and measured efficiency exceeding 94% -- surpassing the IE3 motor efficiency requirements that apply in the European Union and Australia.
All-Stainless Air-Contact Surfaces and Integrated Tank
The integrated storage tank and all outlet pipework are constructed from food-grade stainless steel, eliminating rust contamination and the need for rust inhibitor treatments that could introduce trace chemistry into the compressed air stream -- a requirement in food, pharma, and electronics environments.
52 dB(A) Advanced Soundproof Casing
At 52 +/- 3 dB(A), this unit operates at roughly the volume of a normal conversation. The combination of soundproof casing, direct-drive elimination of belt noise, and scroll technology's inherently smooth compression cycle achieves this rating without aftermarket acoustic treatment.
Modular Scalability via Multi-Air-End System
The EP-CMW3.7-0.8 air-end is compatible with Ever Power's multi-head enclosure system, accommodating up to four scroll heads with intelligent demand-based load sharing and automatic lead/standby rotation. When air demand grows, the investment in this unit carries forward rather than being replaced.
Independent Cooling Fan and 1 Micron Inlet Filtration
Dedicated cooling maintains near-ambient discharge temperature for low pressure dew point output, while the 1 micron inlet filter protects the scroll mechanism in dusty industrial environments -- reducing abrasive wear on tip seals and extending air-end service intervals.
The Individual Air-End Set Option
Beyond the standard single-unit configuration, the EP-CMW3.7-0.8 scroll mechanism is also available as a standalone individual air-end set -- a compact, super-quiet scroll module that can be integrated directly into OEM equipment, vehicle air systems (electric buses, high-speed rail), or custom compressed air installations requiring oil-free output without a full compressor cabinet. The individual air-end set requires only an annual grease addition and air filter replacement, with no oil anywhere in the system. This option is particularly valued by equipment manufacturers who need to incorporate a clean air source without allocating space for a full compressor unit.
Scroll Compression Principle -- How the EP-CMW3.7-0.8 Processes Air
The EP-CMW3.7-0.8 processes air through a four-phase continuous cycle: intake at the scroll periphery, sealing of air pockets between the fixed and orbiting scrolls, progressive compression as pockets migrate inward and decrease in volume, and smooth discharge at the central exhaust port. All four phases occur simultaneously across different pockets within the same scroll pair, producing continuous, pulsation-free airflow at 415 L/min. The compression seal is maintained entirely by scroll geometry and tip seal material -- no oil film is required, which is why the compressed air output is structurally oil-free rather than filtered oil-free. This distinction is critical for sensitive applications where even trace oil aerosol cannot be tolerated.
Full Technical Specifications
| Parameter | Specification |
|---|---|
| Model | EP-CMW3.7-0.8 |
| Motor Power | 3.7 kW / 5 HP |
| Working Pressure Range | 0.2 - 0.8 MPa |
| Free Air Delivery (FAD) | 415 L/min |
| Noise Level | 52 +/- 3 dB(A) |
| Outlet Connection Size | 1/2 inch (stainless steel) |
| Weight | 150 kg |
| Dimensions L x W x H | 720 x 680 x 1050 mm |
| Air-End Warranty | 2 Years |
| Motor Type | Permanent Magnet, IP65, F-class insulation, >94% efficiency |
| Drive Type | Direct Drive -- no belt, no coupling |
| Tank and Pipework | Stainless Steel |
| Inlet Filter Precision | 1 micron |
| Lubrication | Oil-Free (annual bearing grease only) |
Application Overview by Industry
| Sector | Application | Primary Benefit |
|---|---|---|
| Food Processing | Packaging lines, filling stations, pneumatic conveyors | BRC/GFSI-compliant zero oil contamination |
| High-Speed Rail | Brake actuation, door systems, pantograph control | Reliable oil-free air for safety-critical systems |
| Precision CNC Machining | Tool change actuation, chip blow-off, spindle cooling | Pulse-free output prevents pressure-spike interference |
| Automotive Spray Coating | Solvent lacquer lines, UV coating, base coat/clear coat | Eliminates fish-eye and cratering defects from oil aerosol |
| Medical Facility | Central air supply for multi-room clinics | Meets medical air quality standards without add-on filtration |
Customer Case Studies -- EP-CMW3.7-0.8
United Kingdom -- Food Packaging Manufacturer
Resolving a BRC Food Safety Audit Flag on Compressed Air
A ready-meal packaging plant near Birmingham received a third-party BRC audit finding categorising their oil-injected screw compressor as a medium food safety risk -- even with downstream coalescence filters installed. Replacing the system with the EP-CMW3.7-0.8 removed the risk at source. The subsequent BRC audit passed with no compressed air findings. The plant's production manager noted that the 415 L/min output handled peak demand from two filling lines simultaneously without pressure drop, and that 18 months of three-shift continuous operation produced no unplanned downtime.
★★★★★
"Passed our BRC audit with no compressed air comment for the first time. Eighteen months continuous -- not a single unplanned stop." -- Production Manager
South Korea -- CNC Machining Centre
Stable Air Supply Eliminating Spindle Measurement Interference
A Korean precision machining subcontractor operating four CNC turning centres experienced pressure spikes from their piston compressor during start cycles that were measurably affecting spindle bearing preload readings -- a critical quality parameter for the aerospace components they produce. The EP-CMW3.7-0.8's pulse-free, continuous 415 L/min output completely eliminated the pressure variation. The maintenance engineer additionally noted that the PLC controller's display allowed their facility management system to track compressor status without a dedicated monitoring terminal.
★★★★★
"Pressure spikes are gone. Spindle readings are consistent again. The PLC integrates into our monitoring system with no extra hardware." -- Maintenance Engineer
Brazil -- Automotive Spray Coating Facility
Eliminating Fish-Eye Defects in Solvent Lacquer Coating
An automotive parts coating operation in Sao Paulo was generating a 3.5% defect rate on finished components due to fish-eye cratering in their solvent lacquer -- a defect pattern traceable to residual hydrocarbon aerosol passing through the downstream coalescing filters on their oil-injected compressor. After switching to the EP-CMW3.7-0.8 and decommissioning the now-redundant oil coalescing filter bank, the defect rate on that product line dropped to below 0.4% within the first production month. Annual savings from reduced rework and material waste exceeded the acquisition cost of the compressor unit within twelve months.
★★★★★
"Defect rate from 3.5% to under 0.4%. The ROI calculation was straightforward -- the compressor paid for itself in under a year." -- QC Supervisor
Frequently Asked Questions -- EP-CMW3.7-0.8
How does the EP-CMW3.7-0.8 compare to an oil-injected screw compressor at the same power level?
An oil-injected screw compressor at 3.7 kW requires oil separators, coalescing filters, water-oil separators, and regular oil changes -- and still cannot guarantee ISO 8573-1 Class 0 oil-free output. The EP-CMW3.7-0.8 delivers structurally oil-free air at 415 L/min with lower maintenance overhead, lower noise, and no downstream contamination risk. For applications where air purity is a product quality driver, scroll compression eliminates the risk rather than managing it.
Why is pulsation-free air important, and does the EP-CMW3.7-0.8 provide it?
Pressure pulsation causes measurement interference in sensitive instruments, vibration in pneumatic tools, inconsistent atomisation in spray applications, and premature wear in pneumatic actuators. Scroll compression is inherently pulse-free -- multiple compression pockets operate simultaneously and continuously, producing a smooth, steady output. The EP-CMW3.7-0.8 delivers consistent 415 L/min flow with no measurable pulsation at the outlet.
Can this unit be expanded to produce more air as demand grows?
Yes. The EP-CMW3.7-0.8 air-end is compatible with Ever Power's multi-air-end cabinet system. Up to four scroll heads can be installed in a single cabinet with intelligent PLC control managing demand-based start/stop and automatic lead/standby rotation to equalise wear. The investment in this unit carries forward as your operation grows rather than requiring a complete system replacement.
What is the ongoing annual maintenance cost for this compressor?
Annual maintenance costs are limited to an inlet air filter element, a tip seal ring inspection and replacement when the PLC maintenance reminder triggers, and a small bearing grease addition once per year. There are no oil changes, no oil filter elements, no oil separators, and no water-oil separators -- the total annual consumable cost is significantly lower than oil-based compressors of equivalent output capacity.
Is the EP-CMW3.7-0.8 suitable for food industry compressed air applications?
Yes. The structurally oil-free output, stainless steel air-contact surfaces, and 1 micron inlet filtration make this unit well-suited to food and beverage applications governed by BRC Global Standard, FSSC 22000, or equivalent food safety frameworks. For specific particle class or moisture class targets, appropriate downstream filtration and drying should be specified.
Begin Your Enquiry -- EP-CMW3.7-0.8
Whether you are upgrading from an oil-based system, specifying compressed air for a new production line, or evaluating scroll compressor technology for the first time, Ever Power provides comprehensive application support. Learn more about Ever Power's engineering and manufacturing standards, compare models across the full EP-CMW product range, or contact our team to discuss your specific flow rate, pressure, and air quality requirements.
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