External Fan Units for Frequency-Controlled Electric Motors
Frame Sizes 56 to 470
Constant Cooling for Frequency-Controlled Drives
Efficient cooling is essential for the reliable operation of frequency-controlled electric motors. Our external fan units ensure constant airflow regardless of motor speed – ideal for use with inverter-driven systems. We supply high-performance forced ventilation units for electric motors in frame sizes 56 to 470, available in standard dimensions or custom-built to your specifications.
Unlike self-ventilation, external cooling maintains full performance even at low or zero motor speeds – making it a must for variable-frequency applications. Our fan units are designed for maximum reliability, easy installation, and long service life.
#01
External Fan 1G/2G Type Z-RBK, IP66
Size 250 to 450 Heavy Mill Duty
#02
External Fan 0M Type MW, IP66
Size 63(56) to 225 cooling operation down to -40°C
#03
External Fan 1M Type MW, IP66
Size 250 to 315 cooling operation down to -40°C
#04
External Fan 0M Type MW, IP66
Size 63(56) to 112 special voltage 115/200 V
#05
External Fan 1R Type R-RBK, IP66
Size 250 to 355 noise minimized
In-house production tailored to your needs
Here you will find a comprehensive overview of all relevant technical features, performance data, and specifications that are important for a better understanding of functionality and quality.
Your Benefits
- Compact design and easy installation
- IP66 – maximum protection for harsh environments
- Fast delivery & high availability
- Multivolt capability for flexible integration
- Customizable – even for small batch quantities
Product Highlights
- Frame sizes 56 to 470 – tailored to fit standard IEC motors
- Standard models or custom dimensions based on your drawings
- IP66 protection rating – dust-tight and protected against powerful water jets
- Multivolt versions – suitable for various voltages and international applications
- Custom designs upon request – e.g., for high ambient temperatures, special connectors, or custom coatings
- Ideal for retrofits – perfect for repair shops and modernization projects
Who Benefits from Our External Fan Units?
Our solutions are designed for:
- Electric motor manufacturers looking to optimize motors for inverter duty
- Plant and machinery builders needing reliable cooling at variable speeds
- Repair companies retrofitting motors with external cooling
- Technical buyers seeking robust, easy-to-install components with clear specifications
Areas of application
- Frequency-controlled drives
- Machine tools
- Offshore and onshore applications
- Mining & heavy industry
- Special-purpose machine construction
Product features
- Special designs > IEC 470 on request
- Standard version with IP66 protection rating
- Custom adapter solutions
- Interchangeable mounting adapters (frames)
- Multi-voltage version for single-phase and three-phase connection
- UL/CSA in insulation class F
- Noise-optimized, performance-optimized impellers
- Statically and dynamically balanced wheels for machine tools
- Aluminum fan blades optional
- Insulation classes F or H
- VIK version
- Thermal protection with PTC thermistors or standstill heating
- 2-piece terminal boxes (PPN or aluminum)
- Variants with plug or cable without terminal box
- Rain cover, tropical version, textile version
- Dust-protected bearings, offshore gray cast iron motors
- Vibration-resistant design for harsh operating conditions
- Hood thicknesses up to 5 mm for mining
- Free use of the second shaft end possible
- Pre-painted hoods or epoxy resin coating (C5)
- Galvanized or stainless steel hoods
We’ll help you find the right brake for your application and support you through implementation and integration.
FAQ
Technical references
Can the external fan also be supplied in special dimensions or configurations?
We can manufacture the external fan according to your specifications starting from just 1 piece. Please use our inquiry datasheet for this purpose.
What is the delivery time?
Standard sizes can be ordered in small quantities from stock. Custom-made external fans generally have a delivery time of 3–4 weeks.
Can I get the external fans with a finished coating?
In the standard version, our external fan housings are delivered with a gray primer. On request, they can also be powder-coated in almost any common RAL color. Alternatively, manufacturing in stainless steel is also possible.
What supply voltage can I use to operate the external fans?
Most of our external fan types have a multi-voltage connection of 346–525 V, 50 Hz or 380–575 V, 60 Hz. Sizes 63–225 even include a single-phase connection.
Additional special voltages are available under the “Special Versions” section.
Do you have specific questions or requests?
Please contact us directly via our contact form. You can find the responsible representative under Contact at the top right of our website.