Cheap 7.5-132 KW Frequency Inverter PM VSD Rotary Screw Air Compressor
Core Advantages
✅ Full Power Coverage: Complete 7.5kW–250kW models to satisfy small, medium and large factories’ air supply needs
✅ Multi-Pressure Support: Working pressure adjustable between 0.7MPa–1.25MPa for different production standards
✅ Low Noise Operation: Running noise controlled at 66±2 ~ 75±2 dB(A) to build quiet workshop environment
✅ High-Efficiency Direct Drive: Coaxial integrated transmission eliminates belt energy loss, boosting overall efficiency
✅ Grid-Friendly Soft Start: VFD soft start limits startup current within full-load value, reducing impact on power grid and electric equipment
✅ Ultra Energy-Saving Motor: Permanent magnet motor maintains high efficiency at low speed, saving 22%-40% vs fixed-speed compressors and 5%-15% vs ordinary inverter machines
✅ Durable Motor Structure: High-temperature NdFeB magnets (15+ years service life, no demagnetization under 120℃) + anti-corona stator enameled wire for stable long-term operation
✅ Easy Maintenance: Flip door design, simple-to-clean cooler & fan, convenient filter replacement
✅ Intelligent French PLC Control: Touch screen panel supports real-time data display, operation records, fault reminders and multi-language switching
Technical Parameter
| Model | 10A | 15A | 20A | 25A | 30A | 40A | 50A | 60A | |
| 1.2/0.7 | 1.65/0.7 | 2.5/0.7 | 3.2/0.7 | 3.8/0.7 | 5.3/0.7 | 6.8/0.7 | 7.4/0.7 | ||
| Free air delivery / Discharge pressure (m³/min / MPa) |
1.1/0.8 | 1.5/0.8 | 2.3/0.8 | 3.0/0.8 | 3.6/0.8 | 5.0/0.8 | 6.2/0.8 | 7.0/0.8 | |
| 0.95/1.0 | 1.3/1.0 | 2.1/1.0 | 2.7/1.0 | 3.2/1.0 | 4.5/1.0 | 5.6/1.0 | 6.2/1.0 | ||
| 0.8/1.25 | 1.1/1.25 | 1.9/1.25 | 2.4/1.25 | 2.7/1.25 | 4.0/1.25 | 5.0/1.25 | 5.6/1.25 | ||
| Lubricating oil quantity (L) |
4 | 7.5 | 14 | 14 | 14 | 30 | 30 | 30 | |
| Driving mode | Direct drive | ||||||||
| Power supply | 380V/50Hz/3P or customized | ||||||||
| Power (kW) | 7.5 | 11 | 15 | 18.5 | 22 | 30 | 37 | 45 | |
| Startup mode | Y-Δ start-up | ||||||||
| Dimension (mm) | 850*670*870 | 1100*750*920 | 1250*850*1160 | 1350*1000*1190 | |||||
| Outlet diameter | G¼ | G¼ | G1 | G1 | G1 | G1¼ | G1¼ | G1¼ | |
| Model | 75A | 100A | 120A | 150A | 175A | 200A | 250A | 300A | 350A |
| Free Air Delivery / Discharge Pressure (m³/min / MPa) | 10.0/0.7 | 13.4/0.7 | 16.2/0.7 | 21.0/0.7 | 24.5/0.7 | 28.7/0.7 | 32.0/0.7 | 36.0/0.7 | 42.0/0.7 |
| 9.6/0.8 | 12.6/0.8 | 15.0/0.8 | 19.8/0.8 | 23.2/0.8 | 27.6/0.8 | 30.4/0.8 | 34.3/0.8 | 40.5/0.8 | |
| 8.5/1.0 | 11.2/1.0 | 13.8/1.0 | 17.4/1.0 | 20.5/1.0 | 24.6/1.0 | 27.4/1.0 | 30.2/1.0 | 38.2/1.0 | |
| 7.6/1.25 | 10.0/1.25 | 12.3/1.25 | 14.8/1.25 | 17.4/1.25 | 21.5/1.25 | 24.8/1.25 | 27.7/1.25 | 34.5/1.25 | |
| Lubricating Oil Quantity (L) | 65 | 65 | 72 | 90 | 90 | 110 | 110 | 125 | 125 |
| Driving Mode | Direct drive | ||||||||
| Power (kW) | 55 | 75 | 90 | 110 | 132 | 160 | 185 | 220 | 250 |
| Startup Mode | Y-Δ Start-up | ||||||||
| Dimension (mm) | 1800*1230*1570 | 1900*1230*1570 | 2300*1470*1840 | 2650*1650*2045 | 3300*2100*2190 | ||||
| Weight (kg) | 1073 | 1272 | 1327 | 1801 | 1848 | 2400 | 2600 | 3100 | 3300 |
| Outlet Diameter | G2 | G2 | G2 | G2½ | G2½ | G2½ | G2½ | DN100 | DN100 |
Application
- General Manufacturing & Assembly Lines: Provides stable, dry air for pneumatic tools, robotic arms, and automated assembly equipment in industries ranging from automotive parts to consumer electronics.
- Heavy Industry & Metal Fabrication: The 250kW top-end capacity and 1.25MPa pressure support satisfy high-demand applications such as sandblasting, plasma cutting, stamping presses, and heavy-duty die casting.
- Food & Beverage Processing: Low-noise operation (as low as 66 dB(A)) allows for installation near production floors without disturbing sensitive environments, while the high-efficiency drying capability ensures clean air for packaging and conveying.
- Textile & Garment Manufacturing: Delivers continuous, oil-free quality air for jet looms, spinning frames, and garment finishing, with the VFD soft start preventing voltage drops that can disrupt sensitive electronic looms.
- Pharmaceutical & Chemical Pilot Plants: The intelligent French PLC controller ensures precise pressure consistency for fermentation aeration and chemical mixing, while the durable motor structure guarantees 24/7 reliability in critical processes.
- Woodworking & Paper Mills: The flip-door design facilitates quick cleaning of dust and debris from coolers, reducing fire hazards and downtime in high-particulate environments.
FAQ
Q1: What does "22%-40% energy savings" actually mean for my monthly electricity bill?
- A: The savings are compared to traditional fixed-speed compressors running at partial load. Because our permanent magnet motor maintains high efficiency even at low speeds, and the VFD adjusts motor RPM to match real-time air demand, you avoid the wasted energy of constant "unloading" cycles. For a factory operating two shifts, this typically translates to a full return on investment within 12–18 months.
Q2: Can this compressor handle sudden surges in air demand without stalling?
- A: Yes. The VFD (Variable Frequency Drive) soft-start system provides a rapid torque response. While it limits the startup current to protect the grid, the drive can instantly increase motor speed to meet a sudden spike in downstream consumption, ensuring your production line never experiences a pressure drop.
Q3: How noisy is 66 dB(A) compared to a standard compressor?
- A: Normal conversation is about 60 dB(A), and a standard industrial piston compressor often exceeds 85 dB(A). At 66–75 dB(A), our unit operates at a level similar to a household dishwasher. This allows you to place the compressor closer to the workshop or even avoid building a separate, expensive compressor room.
Q4: The specifications mention "no demagnetization under 120°C." Does that mean it fails if the room gets hotter than that?
- A: Not at all. 120°C is the threshold for the magnets themselves. In practice, the compressor's built-in cooling system and thermal protection keep the internal motor temperature well below this limit during normal operation. This specification simply guarantees that even under extreme overload conditions, your motor retains 100% of its efficiency for over 15 years.
Q5: How easy is it to replace the air filter and oil separator?
- A: Extremely easy. The "flip door" design allows you to access all service points (cooler, fan, and filters) from the front panel without removing heavy side covers. Most routine filter replacements can be completed in under 10 minutes by your own maintenance team, reducing the need for costly external service calls.
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