Franke Whitepaper Bearing assemblies with Torque-Drive Highly dynamic and efficient

1.1. Definition of direct drive 1.2. Components: bearing assembly with direct drive 2. Comparison: Conventional drive vs. direct drive 4 3. Functionality of direct drive 5 4. Design examples of bearing assemblies with direct drive 6

In a direct drive, the motor and driven component are directly connected. There is no need for intermediate elements for power transmission such as gears, shafts or belts. Changes in motor speed have a direct effect on the driven component in rotary applications. Direct drives are suitable for rotary and linear movements. This info sheet is intended to deal with the use in rotary applications. In a bearing assembly with direct drive, all components are integrated into the bearing housing. Essentially these are: • Ball bearing consisting of raceways, rolling elements and cage • Rotor with magnets...

3. Functionality of direct drive (Torque-Motor) Torque motors are integrated directly into bearing assemblies. The customer receives a completely ready-to-install system. Due to the direct control, it is not only possible to generate a rotary motion, but also to position extremely precisely or to execute defined cycle steps. Bearing assemblies with integrated direct drives are characterized by maximum energy efficiency. The moving masses are significantly lower and power loss due to factors such as friction and backlash is minimized. The coils of the torque motor are integrated in the stator...

When using a wire race bearing for the bearing arrangement, the basic advantages inherent in the principle of the wire race bearing system come into play: • free design of the enclosing housing parts • free choice of materials for the housing parts (e.g. steel, stainless steel, aluminum, plastic) Examples of integration of bearing and drive in a common housing: 1. Franke-Torque with water cooling, KK0 300mm 2. Franke-Torque in steel version, KK0 150mm 3. Franke-Torque in aluminum version, KK0 350mm

5. Measuring systems: As individual as your application All available measuring systems usable All measuring systems available on the market can be integrated into the bearing assembly. Very robust inductive measuring systems are used as standard. They are available as incremental or absolute systems in various accuracy classes. The following interfaces are available: • • Inkrementelle Systeme: TTL, 1Vss, Absolute Systeme: EnDat 22; Fanuc, BiSS, SSI – 1Vpp. The (closed) measuring tape is attached directly to the rotor and the measuring head is screwed to the stator. It is also conceivable to...

6. Against gravity: Bearing assemblies with segmented direct drive In a groundbreaking technological development, Franke presents itself as a pioneer in the field of advanced bearing technologies with the bearing assembly with segment motor. This innovative solution integrates a wire race bearing with a motorized direct drive that overcomes the traditional limitations of vertical bearing applications. Characteristics: Precise design for maximum performance The bearing assembly with segment motor is characterized by a unique structure. The integrated motor, whose stator windings only cover the...

Technical data: Synchronization in percent of rated speed +/-1% Service life due to virtually load-free running 1 billion revolutions

7. Application examples: Performance for many industries Bearing assemblies with direct drives are suitable for numerous applications in many industries. Advantages result from the high performance of the direct drives in the areas of energy efficiency, dynamics and precision. The use of integrated wire race bearings enables further advantages such as weight savings, robustness and high center clearance to be realized. 1. Computer tomograph Bearing assemblies with direct drive ensure high precision in the main bearing of computer tomographs. 2. Filling line The bearing assembly with direct drive...

3. Measurement of pipeline tubes Due to its large center clearance, the bearing assembly with Direkt drive allows ideal placement of the measuring optics. No further elements are required to drive the bearing.

4. Radar antenna on telescopic boom Bearing Assemblies with direct drive are suitable for applications where high performance and low space requirements are important criteria. The integration of the drive into the bearing housing means that wearprone assemblies for transmitting drive power, such as toothed belts, pinions or gears, can be dispensed with. This reduces maintenance costs, increases efficiency and improves both the speed range and positioning accuracy. 5. Wheel hub with direct drive Customer-specific bearing for direct integration into the customer‘s design. Absorption of forces...

7. Assembly of printed circuit boards Rolling bearings for a high-performance placement head for PCB production with a cycle frequency of 18 start/stop movements per second and up to 120 million revolutions within five years. The service life is set at ten years. The bearing must be preloaded without play in all directions at 70 °C so that the components can be precisely assembled.

Design / Operating conditions 1. What diameters are feasible? Diameters from 100 to 1800mm are possible. 2. What operating temperatures are permissible? 8. Are NFPA / UL standards met? It is possible to equip the insulation system of the motor with UL listed materials. General information, safety instructions, connection diagrams and installation and maintenance instructions. Various sensors are available for integration: PTC (PTC thermistor) / KTY (temperature sensor) / triplet switch (bimetallic switch). The nominal torque is doubled. This reduces the size. Motor and bearing assembly run out...

„If you have any questions about our LTD type bearing assemblies, I will be happy to help you.“ Dipl.-Ing. (BA) Peter Niemeyer, team leader constructikon and development Phone. +49 73661 920-172, [email protected]