FASM PM VSD Screw Air Compressors

When choosing an air compressor, the step most easily overlooked is "is the power right". A workshop with modest air demand that picks an oversized machine runs it in a low-load range for long periods, hurting both energy efficiency and stability. Pick one too small and the equipment runs at or beyond full load for long stretches, shortening its life. For small and medium air-demand scenarios, the power steps must be fine enough to make a close match easy.

The ESSENCE FASM PM VSD screw air compressor covers a power range of 7.5–37kW, with a working pressure of 0.7–1.25MPa and air delivery of 0.33–6.70m³/min. Models run from FASM08A-* to FASM37A-*, and it is a PM VSD product under ESSENCE's firstAir brand line.

Getting to Know firstAir: One of ESSENCE's Product Lines

ESSENCE Compressor is a wholly owned subsidiary of Fusheng Group. Its products have gone through years of iteration and now centre on PM VSD screw models. The firstAir brand line that FASM belongs to is built precisely around this PM VSD technology path. For the user this means FASM is not a stopgap product of some period but a regular model in a mature product line, with R&D, manufacturing and after-sales all backed by Fusheng Group's system rather than starting from scratch. ESSENCE products are exported to Europe and Southeast Asia, which itself indicates that their standards have to meet the usual requirements of different markets. Getting this background clear gives selection decisions a firmer basis.

Seven Power Steps: Shrinking Selection Error

According to the specification table, the FASM series is stepped at 7.5, 11, 15, 18.5, 22, 30 and 37kW, and at each power level air delivery is given for four pressures: 0.7, 0.8, 1.0 and 1.25MPa. The benefit of fine stepping is direct: users can find a specification that better matches actual air demand, reducing the inefficient running of oversizing and the purchase cost paid for redundant power. Air outlets run from G3/4 to G1-1/4 as power rises, giving a clear one-to-one relationship for piping configuration. Matching only roughly by power risks errors at the pressure steps, so checking air delivery step by step is the safer route.

Pressure and Air Delivery Trade Off Against Each Other

One pattern in the specification table is worth noting: for the same model, air delivery is highest at 0.7MPa and falls step by step as pressure rises to 1.25MPa. Take the smaller models in the series: air delivery at 0.7MPa is clearly higher than at 1.25MPa. This is not a product flaw but an inherent characteristic of screw compression — the higher the compression ratio, the less air is available for output. When selecting, match air delivery to the most commonly used working pressure rather than simply taking the maximum in the table. Think this through and the table stops being a pile of isolated numbers.

PM VSD, Coaxial Direct Drive and Wide Voltage

FASM uses PM VSD starting, with speed adjusted continuously to air demand; it slows down automatically when demand is low, avoiding the no-load waste of load/unload cycling on fixed-speed machines. The drive is coaxial direct drive, with the motor connected directly to the airend, cutting losses and maintenance points in the intermediate drive. Voltage/frequency is 220/380/415/440V and 50/60Hz, suiting a range of power grids. Aftercooler outlet temperature is held at ≤ ambient + 15°C, which helps ease the load on downstream compressed air treatment equipment. Together these specifications point to one goal: keeping the equipment stable over the long run, not just performing well at acceptance.

Continuity of Brand and Service

Backed by Fusheng Group's system, ESSENCE products have continuity in R&D, manufacturing and after-sales. For the user this means the equipment is not an isolated machine but part of a system with spare parts supply and service response capability. Confirming the service radius and response capability during selection is often more practical than comparing a few extra parameters.

Specifications at a Glance

Who It Suits

• Small and medium plants with moderate air demand that need fine selection: seven power steps make a close match easy;
• Workshops with pronounced air-demand swings: the economics of PM VSD control grow with the size of the swings;
• Production lines spread across sites that need several units supplying air locally: modest unit power makes layout flexible;
• Companies needing equipment for overseas installations: the wide-voltage design suits different regional power grids.

Selection Advice

1. Match air delivery to the most commonly used pressure: air delivery differs clearly between 0.7MPa and 1.25MPa and the two must not be mixed up;
2. Prefer fine power steps over coarse ones: choose the step that fits best while still meeting air demand;
3. Consider a VSD model first when demand fluctuates widely: the control method has a marked effect on long-term energy consumption;
4. Confirm compressed air treatment and piping at the same time: outlet pipe size varies with power, so matching components should be selected together.

Conclusion

The difference between PM VSD models often lies not in whether they have the feature but in how finely they are stepped. With seven power steps from 7.5–37kW combined with four pressure points, FASM makes selection finer-grained, so small and medium air-demand scenarios can more easily find that "just right" machine.