Product Overview
In industries such as electronics manufacturing (productronics) and automation, the demands on dynamic performance, availability, and service life are continually increasing, requiring complete drive system solutions. The RDDS-20-B rotary direct drive system from Schaeffler Industrial Drives delivers maximum performance in minimum installation space, with an extremely long service life, as a ready-to-install complete system integrating the motor, bearing, measuring system, and cooling device.
Advantages and Features
Advantages
- 70% more torque in the same installation space
- Up to 60,000 cycles per hour
- Maximum power density
- Compact design
Features
- Integrated active air cooling
- Dust protection for moving parts and measuring system, ensuring maximum reliability
- High dynamic performance
- Optimized minimum mass moment of inertia
System Data
| System data | Symbol | Unit | RDDS-20-B |
| Dimensions | Ø x H | mm | 156 x 165.5 |
| Total mass | m | kg | 9.8 |
| Screw-on version | | | Base plate |
| Connection version | | | Plug |
| Mass moment of inertia | J | kgm² | 2.11 x 10-3 |
| Axial runout | | µm | ±10 |
| Radial runout | | µm | ±10 |
| Repeatability (bidirectional) | | µm | 3 |
| Limit speed | nmax | rpm | 600 |
System Components
| System components | Symbol | Unit | RDDS-20-B |
| Bearing | | | Ball bearing |
| Measuring system | | | Rotary · optical · incremental |
| – Resolution | | | 1634 Increments |
| – Interface | | | 1 Vpp (sin/cos) and BiSS C 25 Bit |
| – Reference mark | | | 1 |
| Cooling system | | | Active air cooling (integrated), 24 VDC |
Motor Specifications: RI11-3P-89x50-Z0
| Motor: RI11-3P-89x50-Z0 | Symbol | Unit | RDDS-20-B |
| Ultimate torque (1 s) at Iu | Tu | Nm | 59.3 |
| Peak torque (saturation range) at Ip | Tp | Nm | 53.7 |
| Peak torque (linear range) at Ipl | Tpl | Nm | 38.1 |
| Continuous torque (active cooling) | Tcw | Nm | 24.8 |
| Motor constant (25 °C) | km | N/√W | 1.57 |
| Ultimate current (1 s) | Iu | Arms | 25.2 |
| Peak current (saturation range) | Ip | Arms | 20.2 |
| Peak current (linear range) | Ipl | Arms | 12.3 |
| Continuous current (active cooling) | Icw | Arms | 8.0 |
| DC link voltage | UDCL | V | 360 |
| Maximum permissible DC link voltage | UDCL max | V | 600 |
Dimensional Drawing
