Product Overview
The SEW RXF57-DRN90L4 is a high-efficiency, single-stage helical gearmotor designed for applications requiring high output speeds and compact installation. By combining the RXF57 single-stage gearbox with the 1.5kW (2.0 HP) DRN90L4 IE3 motor, this unit provides exceptional power density. The RXF designation indicates a single-stage helical design with a B5 flange mount, making it ideal for high-speed fans, pumps, and centrifugal applications.
Detailed Technical Specifications
| Category | Parameter | Value / Specification |
| Mechanical | Output Torque (Ma) | Up to 70 Nm |
| Service Factor (fb) | Typically > 1.5 (High reliability) | |
| Gearbox Efficiency | Approx. 98% (Single-stage advantage) | |
| Output Shaft | 20 mm diameter (k6 tolerance) | |
| Gear Ratio (i) | 1.30 to 8.23 (High-speed range) | |
| Electrical | Motor Power (Pn) | 1.5 kW (2.0 HP) |
| Rated Speed (nn) | 1440 RPM (50Hz) / 1750 RPM (60Hz) | |
| Rated Voltage (Un) | 230V/400V (Standard Delta/Star) | |
| Efficiency Class | IE3 (Premium Efficiency) | |
| Protection | Enclosure Rating | IP55 (Standard) / IP66 (Optional) |
| Insulation Class | 155 (F) | |
| Ambient Temp | -20C to +40C |
Complete Model Selection and Comparison Table
| Complete Model Name | Flange Diameter | Mounting | Key Options | Ideal Application |
| RXF57 DRN90L4 | 160 mm | B5 Flange | Standard | High-speed pumps/fans |
| RXF57 DRN90L4/BE2 | 200 mm | B5 Flange | BE2 Brake | Rapid-stop high-speed conveyors |
| RXF57 DRN90L4/V | 160 mm | B5 Flange | Forced Cooling Fan | VFD operation at low frequencies |
| RXF57 DRN90L4/TF/KS | 160 mm | B5 Flange | Thermistor + Anti-Corr. | Corrosive or outdoor environments |
| RXF57 DRN90L4/EI7C | 160 mm | B5 Flange | Integrated Encoder | Synchronized high-speed systems |
3. Modular Options and System Integration
As part of the SEW-EURODRIVE modular system, the RXF57-DRN90L4 can be customized for precision and durability:
- Single-Stage Efficiency: Unlike multi-stage gearboxes, the RXF57 offers nearly 98% mechanical efficiency, resulting in lower heat generation and maximum power delivery for high-speed tasks.
- B5 Flange Versatility: Available in multiple flange diameters (e.g., 120mm, 140mm, 160mm, 200mm) to ensure direct compatibility with your machine interface.
- Integrated BE2 Brake: A fail-safe mechanical brake for instant stopping, critical for high-inertia high-speed loads.
- TF (Thermistor) Protection: Embedded sensors in the 1.5kW motor windings to protect against overload and phase failure.
4. Target Industries and Applications
The RXF57 is specifically engineered for high speed, low torque applications where standard multi-stage gearboxes are too slow:
- Pumping and Fluid Handling: Driving centrifugal pumps where high RPM is required.
- Ventilation Systems: High-efficiency fans and blowers in industrial HVAC.
- High-Speed Conveyors: Light-load transport systems requiring rapid throughput.
- Woodworking and Plastics: Auxiliary drives for high-speed processing machinery.
FAQ
Q: Why use the RXF57 (Single-stage) instead of an R57 (Multi-stage)?
A: The RXF57 is designed for high output speeds (closer to the motor speed). If you need an output speed between 200 and 1000 RPM, the RXF57 is much more efficient than a multi-stage R57, which is designed for higher torque at lower speeds.
Q: Can I mount the RXF57 vertically?
A: Yes, in mounting positions M4 (shaft down) or M2 (shaft up). However, please specify this when ordering so SEW can ensure the unit is filled with the correct oil volume to lubricate the top bearings.
Q: Is the DRN90L4 motor compatible with 60Hz power?
A: Absolutely. On 60Hz power (standard in USA/Brazil), the output speed will increase by approximately 20%, and the power rating will increase from 1.5kW to roughly 1.8kW.
Optimized for Speed and Efficiency
The SEW RXF57-DRN90L4 IE3 is the professional choice for 1.5kW applications requiring high rotational speeds. Its single-stage design ensures maximum energy transfer and cool operation, while the IE3 motor ensures compliance with the strictest global energy regulations.
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