Variable Speed Screw Compressor
Understanding variable speed screw compressor
A Variable speed screw compressor is a rotary screw air compressor that adjusts motor speed to match actual air demand in real-time. Unlike fixed-speed compressors that always run at full speed, a variable speed air compressor adapts its RPM and flow rate based on compressed air requirements. This reduces unnecessary energy waste, lowers electricity expenses, and increases compressor life.
At Loitha, we manufacture advanced variable speed drive compressors engineered for efficiency, reliability, and long-term savings. Whether you need oil-injected screw compressors, our solutions are designed to maximize performance and reduce overall cost of ownership.
How Variable Speed Screw Compressor Works
Our variable speed drive rotary screw compressors use inverter technology to regulate motor speed. This means:
- The motor slows down during low compressed air demand.
- The motor runs at full speed only when required.
- The compressor adapts to fluctuation in pressure or flow demand.
This speed technology delivers stable airflow, reduces wear and tear, and cuts energy consumption significantly compared to fixed-speed models.
Variable Speed Screw Compressors vs Fixed Speed Compressors
- Fixed-Speed Compressors run continuously at 100% RPM, even if compressed air demand is low. This leads to higher energy waste, unnecessary expenses, and increased maintenance.
- Variable Speed Air Compressors regulate motor speed, matching air flow to actual compressed air requirements. This ensures energy efficiency, long-term savings, and improved reliability.
Studies show that choosing a Variable Speed compressor over a fixed-speed compressor can save industries tens of thousands of dollars in energy expenses across its lifetime.
Benefits of Choosing a Variable Speed Screw Compressor
Reduce Energy Consumption
Cut energy costs by up to 35%
Minimize Wear and Tear
Less strain on components compared to fixed-speed compressors
Lower Cost of Ownership
High efficiency reduces both operating and maintenance costs
Real-Time Adaptation
Adjusts motor speed to match air demand instantly
Efficiency and Reliability
Designed for maximum uptime and performance
Flexible Options
Available in oil-injected, belt-driven, and direct drive types of compressors
Applications Across Industries
Loitha’s variable speed air compressors are used in:
- Manufacturing –Stable compressed air system for assembly lines
- Textile – Efficient air supply for fabric processingaving, and finishing operations.
- Ceramic – Energy-saving solutions for molding and kilns
- Food & Beverage – Clean oil-free compressed air for contamination-free production
- Packaging –Dependable air supply for automation systems
- Automotive – Reliable compressed air for workshops and large-scale production
HIGH QUALITY ASSESSORIES
Famous brand air end with SKF bearing, Designed for greater air capacity, improved efficiency, and precision-engineered rotors to extend the lifespan of the moving parts.
Adopting frequency conversion speed to maximize energy savings, creating a new generation of energy-efficient compressors that reduce electricity consumption.
Loitha Control panel provide the most cost effective maintenance program, to ensure trouble-free operation, almost like a built-in service technician.
Using well well-known brand motor with IP54 protection, F-class insulation, and SKF bearings. It offers 3%-5% higher efficiency compared to similar products.
Design of large heat exchange area, effectively preventing overheating and ensuring reliable performance in harsh conditions for extended service life.
Automatically adjust based on gas consumption, low maintenance, good stability, large inlet air.
Technical Parameter
Our variable speed compressors are available in multiple models, from 7.5 kW to 250 kW, with different working pressures, flow rates, and dimensions.
Each model is engineered for energy savings, energy efficient, reduced noise levels, and best-in-class dependability.
| Model | Motor Power | Working Pressure | Free Air Flow | Outer Diameter | Noise level | Weight | Dimensions | |||
| L x W x H | ||||||||||
| 50Hz | kW | Hp | Bar g | Psi g | M3/min | cfm | DN | Db | kg | mm |
| AHD-10A | 7.5 | 10 | 7 | 101 | 1.2 | 42 | 1/2″ | 70±2 | 200 | 950 X 650 X 880 |
| 8 | 116 | 1.1 | 39 | |||||||
| 10 | 145 | 0.9 | 32 | |||||||
| 13 | 188 | 0.7 | 25 | |||||||
| AHD-15A | 11 | 15 | 7 | 101 | 1.6 | 57 | 3/4″ | 70±2 | 210 | 1160 X 700 X 1100 |
| 8 | 116 | 1.5 | 53 | |||||||
| 10 | 145 | 1.3 | 46 | |||||||
| 13 | 188 | 1.1 | 39 | |||||||
| AHD-20A | 15 | 20 | 7 | 101 | 2.5 | 88 | 3/4″ | 70±2 | 230 | 1160 X 700 X 1100 |
| 8 | 116 | 2.3 | 81 | |||||||
| 10 | 145 | 2.1 | 74 | |||||||
| 13 | 188 | 1.9 | 67 | |||||||
| AHD-30A | 22 | 30 | 7 | 101 | 3.8 | 134 | 1″ | 70±2 | 415 | 1200 X 900 X 1150 |
| 8 | 116 | 3.6 | 127 | |||||||
| 10 | 145 | 3.2 | 113 | |||||||
| 13 | 188 | 2.8 | 99 | |||||||
| AHD-40A | 30 | 40 | 7 | 101 | 5.2 | 184 | 1″ | 70±2 | 460 | 1400 X 900 X 1125 |
| 8 | 116 | 5.0 | 177 | |||||||
| 10 | 145 | 4.5 | 159 | |||||||
| 13 | 188 | 3.8 | 134 | |||||||
| AHD-50A | 37 | 50 | 7 | 101 | 6.8 | 240 | 1 1/2″ | 78±2 | 625 | 1560 X 1000 X 1365 |
| 8 | 116 | 6.2 | 219 | |||||||
| 10 | 145 | 5.6 | 198 | |||||||
| 13 | 188 | 4.9 | 173 | |||||||
| AHD-60A | 45 | 60 | 7 | 101 | 7.3 | 258 | 1 1/2″ | 78±2 | 695 | 1560 X 1000 X 1365 |
| 8 | 116 | 7.0 | 247 | |||||||
| 10 | 145 | 6.0 | 212 | |||||||
| 13 | 188 | 5.6 | 198 | |||||||
| AHD-75A | 55 | 75 | 7 | 101 | 10.0 | 353 | 2″ | 80±2 | 980 | 1730 X 1100 X 1610 |
| 8 | 116 | 9.1 | 321 | |||||||
| 10 | 145 | 8.5 | 300 | |||||||
| 13 | 188 | 7.6 | 268 | |||||||
| AHD-100A | 75 | 100 | 7 | 101 | 13.5 | 477 | 2″ | 80±2 | 1000 | 1730 X 1100 X 1610 |
| 8 | 116 | 12.6 | 445 | |||||||
| 10 | 145 | 11.2 | 396 | |||||||
| 13 | 188 | 10.0 | 353 | |||||||
| AHD-120A | 90 | 120 | 7 | 101 | 16.1 | 569 | 2″ | 80±2 | 1700 | 2100 X 1430 X 1740 |
| 8 | 116 | 15.0 | 530 | |||||||
| 10 | 145 | 13.8 | 487 | |||||||
| 13 | 188 | 12.3 | 434 | |||||||
| AHD-150A | 110 | 150 | 7 | 101 | 21.0 | 742 | 2 1/2″ | 80±2 | 2150 | 2500 X 1450 X 1800 |
| 8 | 116 | 19.8 | 699 | |||||||
| 10 | 145 | 17.0 | 600 | |||||||
| 13 | 188 | 15.3 | 540 | |||||||
| AHD-175A | 132 | 175 | 7 | 101 | 25.2 | 890 | 2 1/2″ | 80±2 | 2750 | 2700 X 1580 X 1800 |
| 8 | 116 | 24.0 | 848 | |||||||
| 10 | 145 | 21.0 | 742 | |||||||
| 13 | 188 | 18.3 | 646 | |||||||
| AHD-220A | 160 | 220 | 7 | 101 | 28.7 | 1014 | 2 1/2″ | 80±2 | 3150 | 2700 X 1580 X 1800 |
| 8 | 116 | 27.6 | 975 | |||||||
| 10 | 145 | 24.6 | 869 | |||||||
| 13 | 188 | 21.5 | 759 | |||||||
| AHD-250A | 185 | 250 | 7 | 101 | 32.0 | 1130 | 3″ | 80±2 | 3450 | 2800 X 1830 X 1950 |
| 8 | 116 | 30.5 | 1077 | |||||||
| 10 | 145 | 27.5 | 971 | |||||||
| 13 | 188 | 24.8 | 876 | |||||||
| AHD-300A | 220 | 300 | 7 | 101 | 36.7 | 1296 | 3″ | 80±2 | 3850 | 2800 X 1830 X 1950 |
| 8 | 116 | 34.5 | 1218 | |||||||
| 10 | 145 | 30.2 | 1067 | |||||||
| 13 | 188 | 27.8 | 982 | |||||||
| AHD-350A | 250 | 350 | 7 | 101 | 42.0 | 1483 | 3″ | 80±2 | 4850 | 3250 X 2130 X 2300 |
| 8 | 116 | 40.5 | 1430 | |||||||
| 10 | 145 | 38.1 | 1345 | |||||||
| 13 | 188 | 34.6 | 1222 | |||||||
| Compression stage: single stage | ||||||||||
| Ambient temperature: -5–+45℃ | ||||||||||
| Cooling model: Air –Cooling | ||||||||||
| Discharge temperature(℃): Ambient temperature+15℃ | ||||||||||
| Drive method: Direct coupled | ||||||||||
| Electricity(V/ph/Hz): 380/3/50 | ||||||||||
| Starting method: Star-delta starting | ||||||||||
Why Loitha for Industrial Air Compressors?
- Advanced VSD Technology – Reduces energy expenses and maximizes efficiency
- German Engineering – High-quality accessories ensure durability
- Versatile Range – Choose from piston compressors, oil-free compressors, and screw compressors with variable speed technology
- Proven Reliability – Industry-leading warranty and dependable after-sales service






