PM VSD Screw Air Compressors

PM VSD screw air compressors are the product line with the most models under the ESSENCE brand, 5 in total: EMX, EPM, ESV-M, ESV and ES. They share the same technology path — a screw airend with PM VSD drive — with differences mainly in structural form, power range and applicable duty.

1. Division of Roles Among the Five Models

• EMX PM VSD screw air compressor: working pressure 0.7–1.25 MPa, air delivery 0.33–6.70 m³/min, power 7.5–37 kW, the entry choice in the low-power range;
• EPM oil-cooled PM VSD screw air compressor: working pressure 0.7–1.25 MPa, air delivery 0.33–13.80 m³/min, power 7.5–75 kW, covering medium air volumes;
• ESV-M PM VSD screw air compressor: working pressure 0.7–1.25 MPa, air delivery 2.52–55.00 m³/min, power 45–300 kW, aimed at large air volumes;
• ESV VSD screw air compressor: a VSD screw machine that matches air demand by adjusting speed;
• ES screw air compressor: a conventional screw model, positioned as a stable and reliable basic unit.

2. Specifications

3. What PM VSD Brings

By adjusting speed, a PM VSD model makes air output follow actual demand, avoiding the "blowing off of unused air" that happens at fixed speed. The more pronounced the fluctuation in demand, the more the energy-saving room of VSD control deserves attention; where demand is stable at full load over the long term, the efficiency and reliability of the model itself matter more.

4. Selection Advice

1. Segment by air delivery first: for small air volume look at EMX, for medium scale look at EPM, and for large air volume look at ESV-M;
2. Check against pressure needs: the five models cover a working pressure of 0.7–1.25 MPa, and the pressure rating must match the process;
3. Give priority to VSD where demand fluctuates greatly: the benefit of VSD control stands out more under fluctuating conditions;
4. Consider the basic model where the budget is tight: the ES is a conventional screw machine, suited to applications that do not demand a high specification.