Product Overview
In Suhl, Thuringia, Schaeffler develops and manufactures rotary and linear direct drives that meet the highest demands of industry. Over many years, the torque motor series have been continuously optimised to reach the boundaries of physical and economic feasibility. Each torque motor series features a specific combination of outstanding characteristics, such as high torque density, ultra-high speeds, exceptional synchronisation characteristics and low power loss, allowing virtually all applications in the field of direct drives to be covered.
This catalogue covers three internal running permanent magnet synchronous torque motor series: RIB (high torque density), and RKI and RKIB (high power density). Customers place their trust in these direct drives especially in the machine tool, medical equipment, automation, robotics, food, packaging, printing machinery, textile machinery, productronics and measuring equipment industries.
Catalogue Contents
Technical Principles
Torque motor advantages, characteristics, motor characteristic values, thermal protection, electrical connection, cooling, motor arrangement, selection
RIB Ordering Designation
RIB series primary part and secondary part ordering designation
RIB Series Matrix
RIB11/13/17/19 — overview of 8 model specifications
RKI / RKIB Ordering Designation
RKI and RKIB series ordering designation
RKI / RKIB Series Matrix
RKI5 and RKIB5/11 — overview of 5 model specifications
Cable Outlets
RKI / RKIB axial, tangential and radial cable outlet configurations
Advantages & Features
Advantages (Performance & Operating Costs)
- No conversion of the movement profile: no elasticity, play, friction or hysteresis in the drive chain resulting from transmission or coupling elements
- Multi-pole motor: extremely high torques are produced, usable from speed > 0 up to the rated speed
- Thin, ring-shaped secondary part: large free inner diameter reduces motor inertia and yields a high acceleration rate
- Direct position measurement and rigid mechanical structure enable high-precision, dynamic positioning operations
- No additional moving parts make assembly, adjustment and preventive maintenance easier
- Minimal wear in the drive chain, high availability and good energy efficiency
Design Features
- Hollow shaft: large diameter makes the integration or passage of shafts, rotary distributors and media lines possible
- Installation of the primary part (stator): can be easily integrated into the machine construction due to the small space requirement
- Low section height: a highly compact and axially short construction with high torque is made possible by the large, free inside diameter
- Few components: the highly engineered design decreases the failure rate and increases the mean time between failures
- Can be operated with all common servo drives on the market
Series Characteristics
Torque Motor Structure
A torque motor is made up of a primary part (stator, containing an active coil system) and a secondary part (rotor, containing a permanent magnet system). In a concentric arrangement, the secondary part may be the inner ring (inner secondary part motor) or the outer ring (outer secondary part motor). In the RIB series the permanent magnets are glued on the surface of a steel ring; in the RKIB series the magnets are integrated in a lamination stack (also referred to as buried magnets). Conventional electric motors are classified according to power; torque motors, by contrast, are classified according to the necessary torque.
| Motor Series | Characteristics |
|---|---|
| RIB | Internal running motor with high torque density — Ø up to 1030 mm; peak torque Tp up to 40000 Nm; circumferential speed up to 10 m/s; low cogging torque |
| RKI and RKIB | Internal running motor with high power density — Ø up to 1030 mm; peak torque Mp up to 25000 Nm; circumferential speed up to 30 m/s |
Product Series
RIB Torque Motors
Internal running permanent magnet synchronous motor with a water-cooled, encapsulated lamination-stack stator and a steel ring with glued-on permanent magnets as rotor — view 8 model specifications
RKI / RKIB Torque Motors
High power density internal running motor; the RKIB uses a buried-magnet lamination-stack design — view 5 model specifications