Franke Direct Drive Bearings
12Pages

Highly dynamic and efficient: bearing assembly with torque motor

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

1. Introduction Movement through direct drive 1.1. Definition direct drive 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. 1.2. Components: bearing assembly with direct drive In a bearing assembly with direct drive, all components are integrated...

2. Comparison: Conventional drives vs. direct drive Worm gear Pinion drive Toothed belt Direct drive Rotation speed Installation space Wear / Durability

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...

4. Design example: bearing assemblies with direct drive 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, KKØ 300mm 2. Franke-Torque in steel version, KKØ 150mm 3. Franke-Torque in aluminum version, KKØ 350m

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...

6. 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...

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.

Design / Operating conditions 8. Are NFPA / UL standards met? It is possible to equip the insulation system of the motor with UL listed materials. 1. What diameters are feasible? Diameters from 100 to 1800mm are possible. 2. What operating temperatures are permissible? Up to approx. 120° C. 9. What documentation is supplied? General information, safety instructions, connection diagrams and installation and maintenance instructions. Controller / measuring system 3. How is thermal overload prevented? Various sensors are available for integration: PTC (PTC thermistor) / KTY (temperature...

„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, p.niemeyer@franke-gmbh.de

Franke GmbH Obere Bahnstraße 64 73431 Aalen Phone +49 7361 920-0 Fax +49 7361 920-120 info@franke-gmbh.de Info sheet bearing assemblies with torque motor | Changes and errors excepted