PM VFD Compressors
PM VFD (Variable Frequency Drive) air compressors by AP Compressors (Aerolith Pneumatics). Permanent magnet motor technology with 30-50% energy savings and nationwide service support across Nepal including Kathmandu, Pokhara, Birgunj, Biratnagar and all major cities.
30–50% energy savings versus fixed-speed compressors – the permanent magnet motor runs cooler and more efficiently at partial load
Motor speed adjusts automatically to match actual air demand – stable outlet pressure even as production loads shift across shifts
Reduced mechanical stress from soft start and variable-speed operation – fewer load-unload cycles means lower wear on the compressor airend
| Motor technology | Permanent magnet (PM) |
| Drive | Variable frequency drive (VFD) |
| Capacity range | 10 CFM – 500+ CFM |
| Working pressure | 7 bar – 13 bar |
| Power range | 7.5 HP – 200+ HP |
| Energy savings | 30–50% vs fixed-speed |
| Pressure regulation | ±0.1 bar (stable) |
| Noise level | 62–72 dB(A) |
| Best for | Variable demand, multi-shift plants |
Your air demand changes across shifts
If morning shift uses 60 CFM and evening shift uses 30 CFM, a fixed-speed compressor wastes energy during the low-demand shift. A PM VFD adjusts speed to match actual demand.
You have long idle or low-load periods
Fixed-speed compressors run loaded or unloaded – both consume power. PM VFD compressors slow down during idle periods and consume minimal electricity.
Your electricity bill is a significant cost
For factories running 16–24 hours a day, the energy savings from PM VFD technology typically recover the price difference within 18–36 months.
You need stable pressure for sensitive processes
PM VFD systems maintain tighter pressure regulation (±0.1 bar) compared to fixed-speed systems, protecting sensitive pneumatic equipment and instrumentation.
Your demand is genuinely constant
If your plant runs at 100% air demand 24 hours a day with no variation, a standard fixed-speed screw compressor may be a better investment – we assess this before recommending.
| Criteria | PM VFD Compressor | Fixed-Speed Screw |
|---|---|---|
| Energy savings | 30–50% lower consumption | Baseline |
| Pressure control | ±0.1 bar – very stable | ±0.5–1 bar variation |
| Best for | Variable demand, multi-shift | Constant 100% demand |
| Start-up | Soft start – no inrush current | High starting current |
| Motor wear | Lower – less thermal stress | Higher at load/unload |
| Noise at part load | Quieter – slower speed | Full noise always |
| Initial cost | Higher | Lower |
| ROI period | 18–36 months typically | N/A – no savings target |
PM VFD Compressors →
PM VFD Compressors →
PM VFD Compressors →
PM VFD Compressors →
PM VFD Compressors →
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Support & Answers
Find answers about our air compressors, air dryers, filters, customized compressed air solutions, installation, and maintenance services.
Reach out to our teamPM VFD compressors use permanent magnet motors with variable frequency drives, providing 30-40% more energy efficiency, precise pressure control, reduced maintenance, and longer equipment life compared to regular screw compressors.
PM VFD compressors can save 30-50% energy compared to fixed speed compressors by automatically adjusting motor speed based on air demand, eliminating energy waste during low demand periods.
Yes, PM VFD compressors are ideal for applications with varying air demand as they automatically adjust speed to match requirements, maintaining consistent pressure while optimizing energy consumption.
PM VFD compressors require less maintenance than conventional compressors due to fewer mechanical stresses. Regular maintenance includes air filter changes, oil changes, and periodic inspection of VFD components.
Yes, we provide complete installation, electrical connections, VFD parameter setting, commissioning, and operator training for all PM VFD compressors to ensure optimal performance.
Yes, we maintain inventory of genuine spare parts including air filters, oil filters, VFD components, PM motors, and sensors. We ensure quick availability to minimize downtime.
