EPM Oil-Cooled PM VSD Screw Air Compressors

The cost of compressed air rarely shows up on the purchase invoice. For a compressor that runs year-round, the real expense is electricity—buying the machine is only the beginning; you find out how expensive it is once it is running.

The ESSENCE EPM oil-cooled PM VSD screw air compressor is built around PM VSD drive and an oil-cooled design, with working pressure of 0.7-1.25MPa, air delivery of 0.33-13.80m³/min and power of 7.5-75kW, positioning itself on strong value for money and reliable quality.

First, the Brand: ESSENCE

ESSENCE Compressors is a wholly owned subsidiary of Fusheng Group. That relationship means its product development, manufacturing processes and after-sales service all rest on systems Fusheng Group has built up over many years, rather than starting from scratch. The ESSENCE product range has gone through years of iteration and now centres mainly on PM VSD screw models, with products already exported to Europe and Southeast Asia.

For a buyer, the practical meaning of this background is this: the brand is approachably positioned, but the technology and service network behind it are anything but lightweight.

PM VSD Plus Oil Cooling: Air on Demand and a Stable Motor

A conventional fixed-speed compressor regulates output by loading and unloading: when demand is low the motor still runs at full speed and the surplus air is blown off. The EPM uses PM VSD starting, with speed continuously adjusted to air demand, so it consumes only as much power as the air it supplies, cutting idle waste at the source; at the same time, VSD soft starting reduces the impact on both the grid and the machinery, and pipework pressure stays steadier.

Paired with VSD is the oil-cooled design. Permanent magnet motors are sensitive to temperature, and excessive temperature rise undermines both efficiency and reliability. An oil-cooled approach helps keep the motor's operating temperature within a reasonable range, so the benefits of PM VSD hold up steadily over the long term rather than only under ideal conditions.

Coaxial Direct Drive: One Less Link, One Less Loss

The "coaxial direct drive" in the specifications is a design that is easy to overlook yet has a real effect on day-to-day use.

Common screw compressor drive types are belt drive and gear drive, both of which transmit power through intermediate links, and every link means energy loss and a maintenance point. Coaxial direct drive connects motor and airend directly, giving higher transmission efficiency and a simpler structure while eliminating routine work such as belt ageing, tensioning and replacement. For users who want less maintenance and stable long-cycle operation, this is a plus.

Electrical and Cooling Design for Multiple Markets

The EPM's voltage/frequency rating is 220/380/415/440V, 50/60Hz, covering the domestic grid as well as regions such as Europe and Southeast Asia with different voltage systems and frequencies, which is consistent with the product's presence in those export markets.

Another specification is the aftercooler outlet temperature ≤ ambient temperature + 15°C. The better the discharge temperature is controlled, the lighter the burden on the downstream refrigerated dryer and filters, and the lower the energy consumption and failure rate of the whole air system—an unassuming figure that directly affects how the compressed air treatment equipment is configured and what it costs to run.

Technical Specifications at a Glance

Two key points can be read from this table: first, the power span is wide, with continuous coverage from 7.5kW to 75kW, so everything from local supply in a small workshop to centralised supply in a mid-sized plant can find a matching model in the same series; second, the pressure ceiling is higher, and the 1.25MPa limit lets it cover processes with higher pressure requirements such as laser cutting, bottle blowing and high-pressure testing, widening its range of application.

Who It Suits

• Small and mid-sized manufacturers seeking value: wanting the energy savings of PM VSD on a reasonable budget;
• Workshops with pronounced demand swings: the economics of VSD control grow with the size of the swings;
• Companies with export business or overseas plants: the wide voltage design suits different regional grids;
• Plants with limited maintenance resources: coaxial direct drive reduces routine maintenance items.

Selection Advice

1. Take pressure as needed rather than as high as possible: 1.25MPa is the capability ceiling, and actual selection should match the real demand at the point of use;
2. The benefit of VSD is proportional to the swings: the more irregular the demand, the more room VSD has to save energy;
3. Treatment equipment cannot be skipped: oil-injected is only one part of air quality, and drying and filtration still have to be configured to process requirements;
4. Weigh service capability too: ESSENCE draws on Fusheng Group's service system, and local response capability is worth confirming during selection.

Final Thoughts

PM VSD is becoming the mainstream configuration in the compressor market, and what matters about the EPM is that it brings this technology within reach of companies with limited budgets, without too many compromises on quality or service. If you are looking for a balance between "good enough" and "genuinely good", the ESSENCE EPM deserves a place on your shortlist.