Atlas Copco 1092114241 Fan Motor FF-L112M4-B5 for Screw Compressor Cooling
Fan Motor FF-L112M4-B5 for Screw Compressor Cooling
Product Description
The Atlas Copco 1092114241 is a genuine three-phase induction motor engineered for the cooling fan system of oil-injected screw compressors. Rated at 4 kW with a 4-pole design, this motor drives the axial fan that forces ambient air across the oil cooler and aftercooler heat exchangers. Without adequate cooling airflow, the compressor would exceed its thermal shutdown threshold within minutes. This makes the fan motor a critical component for continuous production reliability.
The motor carries the frame designation FF-L112M4-B5, following IEC standard nomenclature. The "FF" prefix indicates a flange-mounted design without foot mounting. The "112M" denotes a 112 mm shaft height with medium frame length. The "4" identifies the 4-pole configuration. The "B5" is the IEC mounting code for flange-facing installation.
Atlas Copco manufactures this motor at its Wuxi facility in China. The motor complies with IEC 60034-1 and IEC 60034-30 manufacturing standards. This ensures consistent quality across the global production network.
Part Number Evolution
The 1092114241 designation represents the current version of a motor with multiple part number revisions. The table below summarizes the complete evolution:
| Part Number | Configuration | Status |
|---|---|---|
| 1092091605 | Earlier designation | Superseded by 1092127301 |
| 1092091623 | Earlier designation | Superseded directly by 1092114241 |
| 1092127304 | 400V 50Hz configuration | Superseded |
| 1092127301 | 380V 50Hz transition designation | Superseded |
| 1092114241 | Current part number | Active |
The transition from 400V to 380V configuration reflects Atlas Copco's adaptation to regional grid standards. Buyers should verify the correct part number against their compressor's serial number before ordering.
Technical Specifications
Electrical Parameters
| Parameter | Value |
|---|---|
| Part Number | 1092114241 |
| Motor Model | FF-L112M4-B5 |
| Motor Type | Three-phase induction motor |
| Rated Power | 4 kW |
| Rated Voltage | 380V (three-phase) |
| Rated Frequency | 50 Hz |
| Rated Current | 3 A |
| Rated Speed | 1440 r/min |
| Efficiency | 88.6% |
| Power Factor (cos φ) | 0.83 |
| Service Factor | 1.12 |
| Duty Type | S1 (continuous operation) |
| Manufacturing Standard | IEC 60034-1 / IEC 60034-30 |
Mechanical and Environmental Parameters
| Parameter | Value |
|---|---|
| Frame Size | IEC L112M |
| Mounting Type | B5 flange mounting |
| Protection Class | IP55 |
| Insulation Class | F (155°C thermal rating) |
| Net Weight | 32 kg |
| Manufacturer | Atlas Copco (Wuxi) Compressor Co., Ltd. |
Working Principle
Four-Pole Induction Motor Operation
The motor operates as a standard 4-pole three-phase induction machine. At 50 Hz, the synchronous speed equals 1500 r/min. This value comes from the formula: 120 × frequency ÷ pole count. Under rated load, the rotor slips to 1440 r/min, representing a 4% slip rate. This slip generates the electromagnetic torque that drives the connected cooling fan.
The squirrel-cage rotor design requires no brushes or slip rings. Consequently, the rotor assembly is maintenance-free throughout the motor's service life. The only wearable components are the two deep-groove ball bearings supporting the shaft.
Cooling Fan Application
In screw compressor systems, the fan motor drives an axial impeller. This impeller pulls ambient air across the heat exchanger bundles. The power required by a fan follows the cube law relationship with rotational speed. Therefore, the motor's 1440 r/min output is matched to the fan blade pitch and the thermal load of the compressor package.
The B5 flange mounting allows direct coupling to the fan hub without a separate bearing housing. This design reduces alignment complexity and simplifies maintenance access. The flange face positions the motor perpendicular to the airflow path, maximizing cooling efficiency.
Bearing Degradation
Bearing wear is the most common failure mode for cooling fan motors. The progression typically follows three stages. First, a high-pitched whining noise appears during startup. Next, vibration levels increase at the motor housing. Finally, bearing temperature rises sharply, often triggering the thermal protection circuit.
Technicians should measure vibration velocity using an ISO 10816 compliant meter. Values exceeding 3.5 mm/s on the motor housing indicate bearing replacement is due. Values above 7.1 mm/s signal imminent failure, requiring immediate shutdown.
Insulation Aging
Class F insulation tolerates winding temperatures up to 155°C. However, every 10°C increase above the design operating temperature approximately halves the insulation life. The service factor of 1.12 provides a modest overload margin for occasional load fluctuations. Sustained operation at the service factor limit will accelerate insulation degradation and reduce motor life.
Replacement Timeline
Under normal S1 continuous duty, the expected bearing life ranges from 20,000 to 30,000 hours. The motor winding typically lasts 40,000 to 60,000 hours. When cumulative operating hours approach these thresholds, plan preventive replacement to avoid unplanned downtime. Additionally, if the compressor's thermal protection relay trips repeatedly, inspect the fan motor immediately for bearing drag or winding degradation.
Why Choose Genuine Atlas Copco Parts
System Integration Design
Atlas Copco engineers the fan motor as part of the complete compressor thermal management system. The 4 kW output rating, 1440 r/min speed, and B5 flange dimensions are specifically selected to match the fan blade aerodynamics. They also match the heat exchanger flow resistance. The torque-speed curve of the genuine motor is calibrated to the fan load characteristics. This ensures stable airflow across the entire operating range.
Factory Quality Assurance
Each genuine motor undergoes testing at the Atlas Copco Wuxi facility before shipment. The test protocol includes winding resistance measurement, insulation resistance verification, and no-load current check. It also includes vibration assessment per ISO 10816 standards. Motors that pass the full test sequence receive serialized documentation. This provides traceability from manufacturing to installation.
IEC Standard Compliance
The motor meets IEC 60034-1 (rating and performance) and IEC 60034-30 (efficiency classes) standards. This compliance ensures that the motor's performance characteristics match the compressor's electrical documentation. It simplifies maintenance planning and spare parts management for fleet operators.
FAQ
More Motors List
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 |
|---|---|---|
| 1635078801 | MOTOR | 1635-0788-01 |
| 1635078901 | MOTOR | 1635-0789-01 |
| 1635079001 | MOTOR | 1635-0790-01 |
| 1635083050 | MOTOR | 1635-0830-50 |
| 1635087301 | MOTOR | 1635-0873-01 |
| 1635087302 | MOTOR | 1635-0873-02 |
| 1635087303 | MOTOR | 1635-0873-03 |
| 1635087304 | MOTOR | 1635-0873-04 |
| 1635087305 | MOTOR | 1635-0873-05 |
| 1635087306 | MOTOR | 1635-0873-06 |
| 1635087350 | MOTOR | 1635-0873-50 |
| 1635087351 | MOTOR | 1635-0873-51 |
| 1635087401 | MOTOR | 1635-0874-01 |
| 1635087404 | MOTOR | 1635-0874-04 |
| 1635087450 | MOTOR | 1635-0874-50 |
| 1635087501 | MOTOR | 1635-0875-01 |
| 1635087503 | MOTOR | 1635-0875-03 |
| 1635087550 | MOTOR | 1635-0875-50 |
| 1635090501 | MOTOR | 1635-0905-01 |
| 1635090505 | MOTOR | 1635-0905-05 |
| 1635090550 | MOTOR | 1635-0905-50 |
| 1635091301 | MOTOR | 1635-0913-01 |
| 1635091302 | MOTOR | 1635-0913-02 |
| 1635091303 | MOTOR | 1635-0913-03 |
| 1635091304 | MOTOR | 1635-0913-04 |
| 1635091305 | MOTOR | 1635-0913-05 |
| 1635120800 | WIRING MOTOR | 1635-1208-00 |
| 1635120810 | WIRING MOTOR | 1635-1208-10 |
| 1635146200 | MOTOR | 1635-1462-00 |
| 1635146201 | MOTOR | 1635-1462-01 |
| 1635146202 | MOTOR | 1635-1462-02 |
| 1635146203 | MOTOR | 1635-1462-03 |
| 1635146204 | MOTOR | 1635-1462-04 |
| 1635146205 | MOTOR | 1635-1462-05 |
| 1635190101 | MOTOR | 1635-1901-01 |
| 1635190102 | MOTOR | 1635-1901-02 |
| 1635190113 | MOTOR | 1635-1901-13 |
| 1635190117 | MOTOR | 1635-1901-17 |
| 1635190205 | MOTOR | 1635-1902-05 |
| 1635190215 | MOTOR | 1635-1902-15 |
| 1635190216 | MOTOR | 1635-1902-16 |
| 1635190301 | MOTOR | 1635-1903-01 |
| 1635190311 | MOTOR | 1635-1903-11 |
| 1635190312 | MOTOR | 1635-1903-12 |
| 1635190313 | MOTOR | 1635-1903-13 |
| 1635190402 | MOTOR | 1635-1904-02 |
| 1635190407 | MOTOR | 1635-1904-07 |
| 1635190411 | MOTOR | 1635-1904-11 |
| 1635190412 | MOTOR | 1635-1904-12 |
| 1635190413 | MOTOR | 1635-1904-13 |
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