Product Overview
A permanent magnet variable speed screw compressor regulates motor speed dynamically to match real-time compressed air consumption. Instead of operating at a fixed rotational speed and shifting to unloaded status when system pressure peaks, the system alters output frequency through vector control to stabilize line pressure.
This operational model serves production plants where compressed air demand fluctuates across shifts, seasons, or active machining cycles. Sizing a compressor requires analyzing the facility's demand profile rather than reviewing nominal motor power alone.
Technical Specification Parameters
|
Model Series |
Motor Power (kW / HP) |
Free Air Delivery (m3/min) |
Working Pressure (bar) |
Discharge Connection |
Dimensions (L x W x H mm) |
Weight (kg) |
|
PM-VSD 7.5 |
7.5 kW / 10 HP |
0.82 - 1.25 |
7 - 10 |
G 1" |
1150 x 850 x 1320 |
340 |
|
PM-VSD 15 |
15 kW / 20 HP |
1.65 - 2.50 |
7 - 10 |
G 1-1/4" |
1350 x 950 x 1450 |
480 |
|
PM-VSD 37 |
37 kW / 50 HP |
3.80 - 6.40 |
7 - 10 |
G 2" |
1750 x 1150 x 1680 |
920 |
|
PM-VSD 75 |
75 kW / 100 HP |
8.20 - 13.50 |
7 - 10 |
DN50 Flange |
2200 x 1400 x 1950 |
1650 |
Typical Industrial Applications
CNC Machining & Metal Fabrication
Supplies stable pneumatic pressure for automated tool changers, clamping cylinders, and laser cutting assist gas.
Automotive Assembly
Drives pneumatic fastening tools and automated guided vehicles (AGVs) where consistent torque depends on steady line pressure.
Packaging Lines
Adapts output dynamically as automated sealing, sorting, and labeling stations cycle on and off.
General Manufacturing
Operates continuous utility air networks across textile, electronics, and processing plants.
Technical Architecture & Operating Principle
Permanent Magnet Motor: Constructed with high-coercivity rare-earth magnetic materials (such as NdFeB) rated for thermal stability up to 80°C. The direct-drive rotor configuration removes gears, pulleys, and belts to eliminate transmission slip and mechanical loss.
Variable Frequency Drive (VFD): Employs advanced vector control algorithms to manage motor rpm smoothly across a wide frequency band, suppressing harmonic distortion and maintaining thermal equilibrium.
Screw Air-End: Utilizes optimized asymmetrical rotor profiles supported by heavy-duty cylindrical roller bearings to maintain tight internal clearances, minimal vibration, and stable volumetric efficiency during long-term industrial cycles.
Maintenance & Serviceability Considerations
Long-term operational reliability depends on predictable upkeep routines:
Consumables Access: Grouped spin-on oil filters, air filters, and air-oil separators simplify routine replacement intervals.
Thermal Management: Oversized aluminum or copper-tube heat exchangers maintain safe operating oil and discharge temperatures in high ambient facility conditions (up to 45°C).
Direct-Drive Simplicity: Eliminating belts removes the need for periodic tension checks, alignment adjustments, and belt-replacement downtime.
Environmental & Installation Site Requirements
Ventilation & Ambient Clearance: Maintain a minimum clearance of 1.2 meters around the compressor enclosure to ensure adequate cooling airflow through the oil coolers and motor housing.
Foundation & Floor Loading: Install the unit on a flat, level, and rigid concrete floor capable of supporting the static dead weight and dynamic vibration loads during startup. No special heavy-duty foundation bolts are required due to the balanced direct-drive assembly.
Ambient Operating Limits: Standard operating temperature ranges between +5°C and +45°C. For installation sites subject to freezing conditions or high ambient humidity, specialized enclosure heating or moisture-resistant electrical ratings must be specified.
FAQ
Q: Is a permanent magnet variable speed compressor suitable for constant base loads?
A: If a facility operates at a completely flat 100% capacity utilization 24 hours a day without demand variation, a fixed-speed or two-stage compressor may be evaluated. VSD technology delivers maximum efficiency gains when air demand fluctuates.
Q: How does the direct-drive permanent magnet motor reduce maintenance?
A: The rotor is mounted directly onto the compressor shaft, removing external belts, pulleys, couplings, and motor bearings. This eliminates belt tension adjustments, alignment checks, and frequent bearing greasing.
Q: What electrical supply checks are necessary for import orders?
A: Incoming line voltage, frequency (50Hz vs 60Hz), and local electrical grid compliance must be confirmed prior to factory dispatch to ensure proper VFD operation and harmonic compliance.
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