Japan Air Motor JAM-2.5PE-750SR

The Japan Air Motor JAM-2.5PE-750SR is a rotary vane pneumatic air motor engineered specifically for severe marine, offshore, and industrial handling environments. Manufactured in Osaka, Japan, by Japan Air Motor Co., Ltd., this unit delivers continuous rotational torque in environments where standard electrical three-phase induction drives represent an ignition risk or face rapid moisture ingress.

Operating on a nominal clean-air pressure of 0.6 MPa (6.0 bar / 87 PSI), the JAM-2.5PE-750SR outputs 1.8 kW (2.45 HP) at a rated speed of 750 RPM. Its cast-iron casing and precision-ground internal rotor and vane pack provide instantaneous start-stop characteristics, full stall-protection without thermal burnout, and smooth torque delivery across its entire throttle profile. The motor is built to withstand hazardous deck wash-down conditions, flammable vapor environments, and high-vibration shipboard setups.

Model Details

• Manufacturer: Japan Air Motor Co., Ltd.
• Model Code: JAM-2.5PE-750SR
• Manufacturer Part Number (MPN): JAM-2.5PE-750SR

Technical Details

Features

1. 100% Spark-Free Intrinsically Safe Operation: Air-driven design creates zero electrical arcing or stray current, making it safe for Zone 1 and Zone 2 hazardous gas and fuel oil atmospheres without costly explosion-proof electrical enclosures.
2. Indefinite Stall Protection Under Full Load: Capable of being stalled repeatedly under heavy external loads without winding burnout, coil failure, or internal component overheating common to electric alternatives.
3. Rigid JIS FC250 Cast-Iron Housing: Resists mechanical deformation, galvanic deck corrosion, and salt-mist exposure while dampening vibration during heavy-duty marine use.
4. High Starting Torque Dynamic Response: Rotary vane profile delivers instantaneous rotational torque from zero RPM, ensuring smooth breakaway during loaded valve actuations or winch drum startups.
5. Low-Maintenance Modular Vane Assembly: Features hardened, precision-ground sliding vanes and an easily accessible end-cover assembly to allow rapid shipboard overhauls and vane replacements without pulling the entire drivetrain.

Applications

• Mooring, Deck & Cargo Winches: Direct or geared drive for marine pilot ladder hoists, provision winches, topping lifts, and emergency towing gear.
• Positive Displacement & Sludge Transfer Pumps: Rotary prime mover for bilge skimming pumps, double-diaphragm air pumps, and high-viscosity lube oil/sludge pumps in engine rooms.
• Shipboard Ballast & Cargo Tank Valve Actuation: Drive unit for hydraulic/pneumatic pilot lines, gearboxes, and butterfly valve positioning systems on tankers and bulk carriers.
• Offshore Rig & Drilling Machinery: Pneumatic rotary drive for mud agitators, chemical injection systems, drill string tool rotation, and BOP handling trolleys.
• Paint Mixing & Marine Tank Cleaning: Non-spark agitation drives for flammable solvents, epoxy coatings, and rotary washing nozzles inside fuel and cargo holds.

Cross-References

• Direct Sister Variations: JAM-2.5PE-750D (Dual-Rotation / Reversible Variant), JAM-2.5PE-600D (600 RPM Reversible Variant), JAM-2.5PE-1200S (1200 RPM High-Speed Variant).
• Korean Equivalent: Samgong SAM-2.5-PE-750 / SAM-2.5-PE-300DR.
• Industrial Cross-Frame Equivalents: Gast 4AM/6AM series (requires baseplate adaptation); Atlas Copco LZB/LZL industrial air vane series.

Frequently Asked Questions

What does the “SR” designation mean in the JAM-2.5PE-750SR model number?

“SR” stands for Single Rotation (standard Clockwise rotation when looking directly at the output drive shaft). Unlike dual-rotation (“D”) models, the internal porting and cylinder sleeve in the SR model are optimized for efficiency in a single direction, meaning air cannot simply be reversed between ports.

What is the required air pressure and air volume to operate this motor at rated capacity?

The motor achieves its rated 1.8 kW (2.45 HP) and 750 RPM at dynamic air pressure of 0.6 MPa (6 bar / 87 PSI). Free air consumption under full load is approximately 2.1 to 2.5 Nm³/min. Operating at pressures below 0.4 MPa will reduce output torque and rotational speed.

Can this air motor stall without damaging the internal parts?

Yes. Pneumatic vane motors are inherently stall-safe. If external torque exceeds the motor’s maximum output, the motor will stall smoothly without drawing excessive current, burning out components, or causing mechanical seizure, provided dynamic pressure is maintained and lubricated air is present.

How do I replace worn vanes during a shipboard overhaul?

Isolate air supplies and remove the non-drive end casing plate. Pull the rotor assembly forward to access the radial vane slots. Measure the vane depth against manufacturer wear limits (typically replace if height has worn by more than 2.0 mm). Always replace the complete vane set simultaneously and coat new vanes in clean turbine oil before reassembly.

Is the JAM-2.5PE-750SR suitable for use in cargo pump rooms and tanker decks?

Yes. Because it uses compressed air rather than electricity as its power source, it creates no sparks, electrostatic discharge, or high surface temperatures. It is widely used across chemical carriers, oil tankers, and gas carriers for deck and hazardous zone machinery.