The Future Runs Oil-Free
Aerodynamic Foil Bearings Made in Germany
Manufacturing Aerodynamic Foil Bearings
Where precision engineering meets manufacturing craftsmanship – customized production for your application
Why every aerodynamic bearing requires individual manufacturing
Standardized approaches don't work for aerodynamic bearings: each application presents specific requirements for design and manufacturing. Different cooling strategies, gas media, electromagnetic fields, and rotor geometries demand precisely coordinated production processes. Through the combination of profound manufacturing experience and scientific methodology, efficient, reproducible, and economical bearing solutions are realized – from single prototypes to mass production.
RADIAL FOIL BEARINGS FOR RELIABLE HIGH-SPEED OPERATION
Oil-free precision for maximum speeds and smooth running
Radial foil bearings set new standards in aerodynamic bearing technology. The multi-layer foil structure made from high-temperature resistant materials such as Inconel or stainless steel provides exceptional damping while maintaining high stiffness. The complex spring foil geometries are manufactured using state-of-the-art laser cutting and forming technologies and undergo rigorous quality control to ensure maximum precision and reliability.
Application areas range from turbochargers and electric compressors in the automotive sector to high-speed spindles in medical technology and hydrogen compressors for fuel cell systems. Complete oil-free operation prevents contamination and makes the bearings ideal for sensitive applications. Specially developed high-performance coatings guarantee over 100,000 start-stop cycles without significant wear, ensuring long-lasting performance.
Technical Specifications Radial Foil Bearings
THRUST FOIL BEARINGS FOR MICROTURBINES AND COMPRESSORS
Precise axial load capacity under extreme conditions
Thrust foil bearings set new standards in handling high axial loads while maintaining high-speed capability. The segmented design with 6 to 12 pads ensures optimal pressure distribution and thermal stability. Each spring structure has been precisely optimized through detailed simulations and practical testing, while optional cooling channels ensure reliable operation even under extreme thermal conditions.
Thrust foil bearings particularly excel in microturbines, turbochargers with high axial loads, and industrial compressors. The bidirectional design allows for handling alternating axial forces, such as those occurring in fuel cell compressors. High-precision manufacturing guarantees perfect surfaces and reliable tribological properties for long-lasting, low-friction operation.
Technical Specifications Thrust Foil Bearings
GERMAN ENGINEERING EXCELLENCE
Where tradition meets innovation
The manufacturing of our aerodynamic bearings takes place exclusively in Germany. Here we combine traditional German engineering craftsmanship with state-of-the-art manufacturing technology. Investments in cutting-edge measuring machines guarantee the highest manufacturing accuracies in the micrometer range.
Special attention is paid to foil forming – the heart of every foil bearing. Through proprietary forming processes that we have perfected over years, we achieve reproducible spring characteristics with tolerances of less than 2%. Each individual foil undergoes a multi-stage quality assurance process, from incoming inspection of raw materials through inline measurement during manufacturing to final 3D measurement of the complete assembly.
Heat treatment of spring foils follows precisely controlled procedures in calibrated vacuum and protective gas furnaces. These thermal processes are crucial for mechanical properties and long-term stability of the foils. Through optimized temperature control and defined cooling rates, we achieve the ideal combination of strength, elasticity, and creep resistance. Each batch is validated through hardness testing, tensile tests, and microstructural analysis to guarantee consistent material properties across all production lots.
Assembly takes place in climate-controlled cleanrooms of ISO class 7 to ensure maximum cleanliness. Specially trained specialists assemble the complex bearing assemblies using micrometer-precise assembly fixtures. After final inspection, we offer comprehensive dynamic test stand testing on our in-house high-speed test facilities upon customer request. These tests include recording vibration behavior, temperature distribution, load capacity, and damping properties under real operating conditions. Detailed information about our complete testing scope according to DIN and ISO standards can be found on our page for vibration testing and bearing inspection.
Quality Without Compromise
SADAP meets the highest quality standards of the automotive and aerospace industries. From material receipt to delivery, we guarantee complete traceability and comprehensive documentation of all manufacturing steps.
Automotive Excellence
Certified series production according to international automotive standards with complete production part approval documentation. Continuous improvement processes and statistical process control for all critical characteristics ensure consistently highest quality.
Aerospace Precision
Aerospace-grade quality assurance with first article inspected components and complete material traceability. Special processes such as coatings are performed according to the highest industry standards and documented.
Process Reliability
Certified quality management system with systematic risk assessment for all products and processes. 100% final inspection with automated data acquisition and digital twin for each produced bearing guarantee complete transparency.
Application Areas and Industries
SADAP's aerodynamic foil bearings are employed in a wide variety of high-speed applications. In the automotive sector, our bearings are revolutionizing electric turbochargers and compressors for fuel cell systems. Complete oil-free operation eliminates the risk of oil contamination in the intake tract or in the sensitive fuel cell membrane. At the same time, the high achievable speeds of up to 200,000 RPM enable more compact and efficient units.
Microturbines for decentralized power generation benefit from the high temperature resistance of our bearings up to 400°C. Maintenance-free operation over the entire service life significantly reduces operating costs. In combination with our high-temperature coatings, these systems achieve operating times of over 40,000 hours without maintenance. This reliability is invaluable, especially in remote locations or mobile applications.
Hydrogen Technology as a Future Market
Our foil bearings are ideally suited for use in hydrogen compressors and expanders. Chemical resistance to hydrogen, combined with the ability to operate at extremely low temperatures, makes them the ideal choice for the hydrogen economy. We have already successfully developed and brought to series production bearings for hydrogen recirculation blowers in fuel cell systems with pressures up to 10 bar and temperatures from -40°C to +85°C.
Special Features of Our Bearing Solutions
Flexibility in Design
Our foil bearings can be customized to almost any installation situation. From miniaturized bearings with 10mm diameter for medical applications to large-format bearings with 300mm for industrial turbomachinery. The modular design enables the integration of sensors for condition monitoring, cooling channels for extreme applications, or special damping elements for particularly vibration-critical systems.
Delivery Times and Availability
Through optimized manufacturing processes and an intelligent inventory concept for standard components, we can realize exceptionally short delivery times. Prototypes are available within 4-6 weeks, small series up to 100 pieces in 8-10 weeks. For large series, we establish dedicated production lines with annual capacities exceeding 100,000 units. Emergency supply for critical applications is possible within 2 weeks through our express manufacturing program.
Technical Support and Consulting
Our engineering team accompanies you from the initial idea to series maturity. We offer comprehensive consulting on bearing selection, integration into your system, and optimization of operating parameters. Training for your personnel on correct assembly and commissioning is part of our service, as is support with fault analysis in the unlikely event of problems. Our simulation tools are available for joint development projects.
High-Speed Rotors – The Perfect Complement
In addition to our aerodynamic bearings, we also offer the manufacturing of complete high-speed rotors. These are specially matched to the characteristics of our foil bearings and together form a perfectly harmonized system. The rotors are manufactured from high-quality materials such as Titanium Grade 5, Inconel 718, high-strength stainless steel, or fiber-reinforced plastics. Through our close collaboration with specialized balancing facilities, we achieve balancing qualities up to G2.5 according to ISO 1940, which is sufficient even for speeds exceeding 100,000 RPM.
Rotordynamic design is performed in parallel with bearing development, whereby critical natural frequencies are deliberately placed outside the operating range. For electric motor applications, we integrate high-energy permanent magnets made from NdFeB or SmCo, which retain their magnetic properties even at high temperatures. Fastening is accomplished through proven banding techniques with carbon fiber or glass fiber that withstand the extreme centrifugal forces at high speeds. Surface treatment of the rotors is performed depending on the application through hard chrome plating, plasma spraying, or special wear protection coatings perfectly matched to our foil bearings. Of course, we provide a complete balancing protocol as well as rotordynamic analysis with Campbell diagram and mode shape representation for each rotor.