PMVF Permanent Magnet Variable Frequency Screw Air Compressor
PMVF Permanent Magnet Variable Frequency Screw Air Compressor adopts a two-stage compression design with interstage fuel injection cooling. The working process is close to the energy-saving isothermal compression cycle, which effectively reduces power consumption and greatly improves overall operation efficiency.
The screw rotor adopts the professional Y-type Tang rotor profile developed by compressor expert Dr. Tang Yan. It features optimized leakage triangle, shorter contact line and smaller discharge closed volume. With excellent machining performance, the rotor delivers outstanding volumetric efficiency and adiabatic efficiency.
The integrated mainframe structure simplifies the overall design and achieves higher performance. The two-stage compression design greatly reduces single-stage bearing load, ensures longer bearing service life and further improves operational efficiency. Through overall structural and rotor optimization, the unit meets national Level 1 energy efficiency standard, with specific power more than 10% lower than national Level 2 standard, showing remarkable technical advantages over most ordinary atmospheric screw compressors on the market.
Strict manufacturing and testing facilities guarantee high precision and reliable quality. Equipped with advanced production and inspection equipment including 34 sets of Japan Mitsui machining centers, 6 sets of Germany KAPP rotor grinders, 11 sets of UK HOLROYD rotor grinders and 8 sets of Germany HEXAGON coordinate measuring instruments, together with professional screw workshop and dedicated compressor testing center, every unit is manufactured and tested under strict standards.
Compared with ordinary power frequency screw air compressors, power frequency models will lose efficiency once deviating from rated working conditions. PMVF permanent magnet variable frequency technology adjusts motor speed and air displacement according to actual air consumption, maintaining high efficiency at all times. It achieves obvious energy-saving effect especially under fluctuating air demand, with comprehensive energy saving up to 50%.
Different from common compressors with external inverters, ordinary motors suffer sharp efficiency drop when leaving rated speed. PMVF permanent magnet motor maintains high efficiency at any rotating speed. Its regulation range reaches 20–100%, much wider than the 40–100% range of conventional inverter compressors, enabling stable operation even under large working condition deviation.
Taking the 37kW model as an example with 8000 hours annual operation:
- PMVF annual power consumption: 183520 kW
- Ordinary screw compressor: 281200 kW
- Regular permanent magnet compressor: 201280 kW
- External inverter compressor: 236800 kW
PMVF can save 53280 kW per year compared with external inverter compressors, owning prominent technical advantages in screw mainframe performance, motor efficiency and intelligent control technology.