Atlas Copco 1092091605 FF112M-4 Cooling Fan Motor
Atlas Copco 1092091605 is a 4.5 kW three-phase cooling fan motor on the IEC FF112M-4 frame. It drives the compressor fan on GA series screw units. Contact us for genuine parts and fast delivery.
5.0
Product name:
FF112M-4 Cooling Fan Motor
Part Number:
1092091605
Suitable for:
GA series compressors
Country of Origin:
CN
Product quality:
100% ORIGINIAL
Brand:
Atlas Copco
Price:
Negotiable
Delivery time:
8-15 Days
Minimum order quantity:
1 PCE
Packing:
Wooden Box / Carton
Transaction mode:
EXW/FOB/CIF/CFR
design customization
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FF112M-4 4.5 kW Cooling Fan Motor
Product Description
This 4.5 kW motor drives the cooling fan on GA series compressors. It is a three-phase induction unit built on the IEC FF112M-4 flange frame.
What this motor is
The 1092091605 is a squirrel-cage induction motor. It turns three-phase supply into the rotation that spins the cooling fan blade. The nameplate defines a 4.5 kW continuous-duty machine tuned for fan load.
Where it sits in the compressor
The motor mounts on the fan bracket inside the compressor canopy. It pulls ambient air through the oil cooler and the aftercooler in turn. Without this airflow, the controller trips on high temperature and air output stops.
| Item | Description |
|---|---|
| Part number | 1092091605 |
| Product type | Cooling fan motor (three-phase induction) |
| Frame | FF112M-4 (IEC) |
| Application | GA series oil-injected screw compressors |
Technical Specifications
Electrical nameplate data
The values below come from the motor nameplate. They define the supply and output the unit is built to deliver.
| Parameter | Specification |
|---|---|
| Motor type | Three-phase induction motor |
| Rated power | 4.5 kW |
| Rated voltage | 400 V |
| Rated frequency | 50 Hz |
| Rated current | 8.7 A |
| Power factor (cos φ) | 0.87 |
| Connection | Y (star) |
| Service factor | 1.0 |
Mechanical and environmental data
The frame, speed and protection ratings suit the warm, oily canopy environment. These figures also come from the nameplate.
| Parameter | Specification |
|---|---|
| Frame designation | FF112M-4 (IEC standard) |
| Rated speed | 1450 r/min |
| Number of poles | 4 |
| Enclosure protection | IP 55 |
| Insulation class | F (155 °C maximum) |
| Mounting type | Flange-mounted (FF) |
| Weight | 46 kg |
Working Principle and Applications
How an induction fan motor works
Three-phase current at 50 Hz energises the stator windings. This creates a rotating magnetic field inside the stator core. This field sweeps the rotor bars and induces current in them. That current then makes torque that turns the shaft. A rotor never reaches synchronous speed. This gap, called slip, gives the 1450 r/min nameplate speed for a four-pole design.
Why the FF112M-4 frame suits cooling duty
The FF prefix is a flange mount on the drive end. It locates the motor precisely on the fan housing. The number 112 is the shaft height in millimetres. Letter M marks the medium frame length. Digit 4 is the four-pole winding. Flange alignment keeps the shaft concentric with the fan hub. This limits vibration that would otherwise shorten bearing life in both parts.
Where this motor is used
This motor serves the thermal loop of GA series screw compressors. Those units inject oil to cool and seal the rotors. They then reject that heat through the oil cooler. The compressed air is cooled by the aftercooler. The fan motor sustains the airflow that makes both exchanges work during continuous running. Stable cooling protects the air end, the oil and the separator element. Good cooling also holds discharge quality and keeps energy use in the design band. The fan motor is small, yet it guards the whole machine.
Market area
We have accumulated extensive knowledge about the quality standards as well as market needs of thesecountries.
Installation and Maintenance
Fitting and alignment
Mount the motor on the prepared flange first. Torque the fixing bolts to the service manual value. Wire the terminal box in the star (Y) arrangement shown on the nameplate. Confirm the supply is 400 V at 50 Hz before energising. Check rotation after the first start. Reverse any two supply phases if the fan runs backwards.
Routine care
Listen for rising bearing noise during scheduled walk-rounds. Keep the cooler fins and fan inlet clear of dust. Good airflow holds the design volume across the coolers. Inspect the terminal box seal at each service interval. Verify the running current stays near the 8.7 A nameplate value under load.
Sizing the motor protection
The 8.7 A nameplate current sets the protection size. Use it to select the circuit breaker and thermal overload. A correct setting prevents nuisance trips and protects the winding. Do not raise the setting to mask a fault.
Handling and storage
Store the spare motor in a dry, clean place above the floor. Keep the shaft free to turn by hand before fitting. Protect the flange face from knocks that could affect alignment. A clean unit installs faster and runs truer.
Common symptoms and checks
Use the table to link a visible fault to the likely cause. Then take the first check shown before opening the motor.
| Symptom | Likely motor-related cause | First check |
|---|---|---|
| Motor will not start | Lost phase, open contactor, tripped overload | Verify 400 V at the terminals, inspect the contactor |
| High-temperature trip | Reduced fan airflow, seized bearing | Confirm the blade spins, clean the cooler fins |
| Excess noise or vibration | Bearing wear, flange misalignment | Re-align the flange, test the bearing |
| Frequent overload trip | Locked rotor, wrong voltage | Check the supply, confirm the load is free |
When to plan a replacement
A motor that trips on heat after a fan check is suspect. So is one drawing well above 8.7 A under normal load. Plan the change during a planned stop, not an emergency. Keep a genuine unit on the shelf for critical machines.
Genuine Quality and Ordering
Why choose the genuine motor
The genuine 1092091605 matches the original frame and shaft. The terminal layout matches the existing wiring. That keeps the fan aligned and the cooling duty stable. You get documented fitment and support you can rely on across the service life. A matched motor also keeps warranty and service records clean. That helps when you track fleet health over years.
Confirm before ordering
Check the points below against your host compressor. This ensures the replacement drops into the bracket and wiring without modification.
| Check | Why it matters |
|---|---|
| Compressor model and serial | Confirms the motor fits your GA series unit |
| Supply 400 V, 50 Hz | Matches the nameplate; wrong supply harms the winding |
| FF112M-4 flange and shaft | Guarantees the motor seats on the fan bracket |
| Rotation direction | Ensures the fan pulls air the correct way |
FAQ
1
What does FF112M-4 mean?
FF is a flange mount. 112 is the shaft height in millimetres. M is the medium frame length. 4 is the four-pole winding. Together they define the IEC frame.
2
Which compressors use this motor?
This motor is specified for GA series oil-injected screw compressors with this frame. Confirm the exact model and serial against the checklist before ordering.
3
Can it run on 60 Hz supply?
The nameplate rates it at 50 Hz and 400 V. A different frequency changes speed and current. Match the supply to the nameplate or consult the manual first.
4
How do I know it needs replacement?
Rising bearing noise points to wear. So does a high-temperature trip that clears after a fan check. A current far above 8.7 A under load also signals trouble.
5
What voltage and connection does it use?
This is a 400 V, 50 Hz three-phase motor. The winding uses the star (Y) connection. Full-load current is 8.7 A at a 0.87 power factor.
6
Why use the genuine motor?
The genuine part keeps the original flange, shaft and terminal layout. That preserves fan alignment and cooling without modifying the canopy or wiring.
Technical Specifications
If you need other Atlas Copco air compressor motors, we provide more models in the table below or you can submit your requirements to us directly.
| Part Number | Part Name | Part-Number |
|---|---|---|
| 1080403363 | MOTOR | 1080-4033-63 |
| 1080403413 | MOTOR | 1080-4034-13 |
| 1080403903 | MOTOR | 1080-4039-03 |
| 1080403911 | MOTOR 30KW GA30VSD 4 | 1080-4039-11 |
| 1080403921 | MOTOR 22KW 400 50 | 1080-4039-21 |
| 1080403931 | MOTOR 30KW GA30VSD 4 | 1080-4039-31 |
| 1080403941 | MOTOR 30KW GA30VSD 4 | 1080-4039-41 |
| 1080403943 | MOTOR 30KW GA30VSD 2 | 1080-4039-43 |
| 1080403944 | MOTOR 22KW G | 1080-4039-44 |
| 1080404609 | MOTOR | 1080-4046-09 |
| 1080404619 | MOTOR | 1080-4046-19 |
| 1080404682 | MOTOR | 1080-4046-82 |
| 1080404689 | MOTOR | 1080-4046-89 |
| 1080404909 | MOTOR | 1080-4049-09 |
| 1080405081 | MOTOR | 1080-4050-81 |
| 1080405209 | MOTOR | 1080-4052-09 |
| 1080405311 | MOTOR-FAN | 1080-4053-11 |
| 1080405328 | FAN MOTOR 1,8KW | 1080-4053-28 |
| 1080405350 | FAN MOTOR 1.5KW | 1080-4053-50 |
| 1080405361 | FAN MOTOR 1,1KW | 1080-4053-61 |
| 1080405511 | MOTOR-FAN | 1080-4055-11 |
| 1080405521 | MOTOR | 1080-4055-21 |
| 1080284701 | MOTOR | 1080-2847-01 |
| 1080284773 | MOTOR | 1080-2847-73 |
| 1080284776 | MOTOR | 1080-2847-76 |
| 1080284777 | MOTOR | 1080-2847-77 |
| 1080284799 | MOTOR | 1080-2847-99 |
| 1080284881 | MOTOR Z 400 460V SI | 1080-2848-81 |
| 1080284882 | MOTOR | 1080-2848-82 |
| 1080284884 | MOTOR | 1080-2848-84 |
| 1080284982 | MOTOR | 1080-2849-82 |
| 1080418203 | MOTOR 11KW 3 | 1080-4182-03 |
| 1080418204 | MOTOR 11KW 400V 50HZ | 1080-4182-04 |
| 1080418212 | MOTOR 11KW 220-230-4 | 1080-4182-12 |
| 1080418221 | MOTOR 11KW 400V50HZ | 1080-4182-21 |
| 1080418411 | MOTOR 7.5KW 200V 60H | 1080-4184-11 |
| 1080418412 | MOTOR 7.5KW 230/460V | 1080-4184-12 |
| 1080418512 | MOTOR 11KW 230/460V | 1080-4185-12 |
| 1080419312 | MOTOR 45KW 230/460V | 1080-4193-12 |
| 1080419412 | MOTOR 55KW 230/460V | 1080-4194-12 |
| 1080419451 | MOTOR 55KW 2 | 1080-4194-51 |
| 1080419452 | MOTOR 55KW 230V 50HZ | 1080-4194-52 |
| 1080419456 | MOTOR 55KW 5 | 1080-4194-56 |
| 1080419461 | MOTOR 55KW 2 | 1080-4194-61 |
| 1080419462 | MOTOR 55KW 230/460V | 1080-4194-62 |
| 1080419463 | MOTOR 55KW 3 | 1080-4194-63 |
| 1080419464 | MOTOR 55KW 5 | 1080-4194-64 |
| 1080419801 | MOTOR 5,5KW 230-460V | 1080-4198-01 |
| 1080420011 | MOTOR | 1080-4200-11 |
| 1080420476 | MOTOR | 1080-4204-76 |
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