Explore our field-proven range of high-efficiency VFD Permanent Magnet rotary screw compressors engineered to cut industrial energy costs up to 30%.
Utilizing rare-earth NdFeB permanent magnets, our PMSMs have zero copper losses in the rotor. They operate significantly cooler than traditional induction motors, preserving magnet life and maintaining over 96% efficiency across the entire speed envelope.
Standard frequency converters operate on basic V/f loops, whereas our high-end vector control cards calculate instantaneous load torques to modify stator voltage vectors. This ensures precise pressure regulation within ±0.01 MPa limits.
By eliminating traditional elastic couplers, gears, or pulleys, the air end rotor and the motor rotor share a single, unified shaft. This direct mechanical coupling prevents transmission friction loss, aligns perfectly, and reduces seal wear.
| Compressor Configuration | Underlying Motor Technology | Transmission Assembly | Energy Consumption at 50% Load | Maintenance Intervals |
|---|---|---|---|---|
| Integrated PM VFD Screw | Rare-earth PMSM (IE5 equivalent) | Direct Coaxial Integrated Shaft | Highly Optimized (48% lower vs. Standard) | Extended (No belts, bearings, or seals to replace) |
| Standard VFD Compressor | Standard Induction Motor (IE3) | Elastic Coupling / Gear Transmission | Moderate (Reduced by 20% vs. Standard) | Typical (Requires motor bearing lubrication) |
| Traditional Fixed Speed | Standard Induction Motor (IE2/IE3) | Pulley Belt Drive System | Inefficient (Requires continuous loading/unloading) | Frequent (Requires belt tightening & replacement) |
Our VFD controls start the motor smoothly from 0 Hz, avoiding peak current spikes on startup and protecting local facility electrical infrastructure.
The frequency drive operates across a wide modulation range, allowing dynamic output adjustment from 15Hz to 75Hz for precise air delivery.
Our permanent magnet rotors use grade-SH NdFeB magnets, certified to resist demagnetization at temperatures up to 180°C.
In multi-compressor installations, a master PLC coordinates the operational schedules of multiple VFD and fixed-speed units. The master controller automatically monitors total network pressure and dynamically adjusts the VFD compressor's speed to handle load variations.
If plant demand exceeds the capacity of the running VFD unit, a fixed-speed compressor is started to provide baseline flow. The VFD unit then adjusts to handle the remaining load variations. This hybrid system minimizes total energy consumption across the entire compressor station.
A heritage of precision engineering, strict quality controls, and advanced compressed air system solutions.
Shanghai Honest Compressor Co., Ltd. is a British-owned enterprise founded in early 2004. Our primary manufacturing facility is located at NO. 355 Jiajian Branch Road, Malu Town, Jiading District, Shanghai, China. Over the last two decades, our factory has grown into a major manufacturing hub for twin-screw air compressors in China.
We design and manufacture a wide range of air systems, including standard and high-pressure piston compressors (low pressure, medium pressure, high pressure, and oil-free variants), screw air compressor systems from 3kW to 480kW, gas separation equipment, refrigerant compressors, cold dryers, line filters, and ceramic membrane filtration assemblies. We also support our products with a complete inventory of OEM spare parts and consumables.
Our manufacturing processes are certified to ISO9001:2015 quality management standards. This ensures strict control over raw materials, assembly tolerances, and final performance verification. All compressor units undergo testing at our in-house center. The energy efficiency data for our permanent magnet variable frequency models routinely exceeds national standards for energy-saving performance.
To support our customers, we maintain a free service hotline at 400-705-9168 and work with a global network of branches, dealers, and technicians to provide prompt technical support and maintenance.
We build to CE standards, using EU-compliant pressure vessels and low-voltage electrical components. Inverters include built-in electromagnetic filters to meet European EMC standards.
Compressors built for the US and Canada feature ASME-certified air receivers, UL/cUL electrical cabinets, NEMA-rated enclosures, and support dual-voltage configurations (460V/60Hz, 575V/60Hz).
For regions with fluctuating grid voltages, our custom VFDs are selected with wider tolerance bands (±15%). They are engineered to handle voltage sags and prevent unexpected shutdowns.
Our latest controllers feature cellular and Ethernet links that stream real-time operational data to our cloud platform. Algorithms monitor vibration and temperature to alert operators before component failures occur.
For applications over 55kW, we are expanding our two-stage rotary screw configurations. Dividing the compression ratio between two distinct air ends lowers the internal temperature rise and improves volumetric efficiency by up to 15%.
To support high-purity sectors like pharmaceuticals and semiconductor fabrication, we are advancing our dry oil-free screw technologies to guarantee ISO 8573-1 Class 0 oil-free air without downstream filtration penalties.
Industrial facilities face strict targets to reduce their carbon footprints. Replacing an outdated fixed-speed air compressor with a modern integrated PM VFD unit is a practical way to lower emissions.
A typical 75kW compressor running 6,000 hours per year can consume around 450,000 kWh of electricity. Upgrading to an integrated PM VFD system can save approximately 135,000 kWh annually, reducing carbon emissions by an estimated 95 metric tons.
Detailed answers to common engineering, procurement, and maintenance questions.
A standard VFD compressor typically uses a conventional induction motor coupled to the air end via gears or an elastic coupling. An Integrated PM VFD compressor uses a Permanent Magnet Synchronous Motor (PMSM) where the motor rotor is mounted directly on the input shaft of the air end. This direct coaxial configuration eliminates transmission losses and alignment issues, while the PMSM motor delivers high efficiency (IE5 rating) even at low operating speeds.
Traditional air-cooled motors rely on a shaft-driven fan, which becomes less effective when the motor slows down under low-demand conditions. Our system routes cooled compressor oil through a cooling jacket surrounding the PMSM stator. This provides consistent cooling across the entire speed range, preventing local hot spots and keeping the magnets within their safe operating temperature limits to prevent demagnetization.
Yes. Our integrated units are built with IP55 or IP65 electrical protection ratings. The permanent magnet rotors use high-grade SH NdFeB magnets that resist demagnetization at temperatures up to 180°C. For tropical or hot climates, we offer high-ambient cooling configurations with oversized radiators and thermostatically controlled fans to keep operating temperatures stable.
By placing the motor and the air end on a single shaft, we eliminate wear components like drive belts, pulleys, gears, and mechanical couplings. There are no motor bearings to lubricate or replace, and shaft alignment is set during manufacturing, which prevents coupling failures and reduces maintenance downtime.
All VFDs generate high-frequency switching noise. To prevent issues, our electrical cabinets include built-in line reactors and electromagnetic interference (EMI) filters. For facilities with strict power quality requirements, we can supply optional active harmonic filters to ensure compliance with IEEE 519 standards.
Our standard single-stage integrated PM VFD compressors support pressures from 0.7 MPa (7 bar) to 1.25 MPa (12.5 bar). The VFD system allows the operator to set the desired target pressure on the PLC interface, and the motor will adjust its speed to maintain that pressure within ±0.01 MPa.
Yes. Our controllers are equipped with RS-485 serial ports and support Modbus RTU protocols as standard. We also offer expansion cards for Profibus-DP, Devicenet, and CANopen, allowing the compressors to integrate with centralized SCADA systems or distributed control networks.
In facilities with fluctuating air demands operating two or three shifts, the energy savings from upgrading from a fixed-speed compressor can pay back the initial capital cost within 12 to 24 months. We can assist with calculations by conducting an air audit of your plant to compare actual demand patterns against the efficiency curves of our systems.
A comprehensive range of high-performance vacuum pumps, integrated all-in-one packages, and high-capacity screw compressors.
