Description
Product Overview
MSK050C-0300-NN-M1-UG1-NNNN (R911331078) is a compact high-torque synchronous servo motor within the Bosch Rexroth IndraDyn S MSK family. Designed to pair with Rexroth IndraDrive M drive systems (HMV regenerative power supply + HMS axis inverters). The part code defines frame size 050, C long stator, 3000 rpm rated speed, plain smooth shaft, no holding brake, M1 Hiperface multi-turn absolute encoder, UG1 rotatable 240° power/encoder connectors. It delivers fast dynamic response and accurate positioning for mid-duty automation axes.
Technical Specifications
| Item | Parameter |
|---|---|
| Manufacturer | Bosch Rexroth (Indramat) |
| Part Number | MSK050C-0300-NN-M1-UG1-NNNN, R911331078 |
| Product Type | Permanent Magnet Synchronous Servo Motor, IndraDyn S MSK |
| Frame Size | MSK050, C long stator |
| Rated Speed | 3000 rpm |
| Shaft | Plain smooth shaft, no keyway |
| Holding Brake | NN = No integrated holding brake |
| Feedback | M1: Hiperface multi-turn absolute optical encoder, 128 signal periods |
| Connector Style | UG1: 240° rotatable power and encoder connectors |
| Protection Class | IP65 (housing and shaft seal) |
| Cooling | Natural convection, no auxiliary fan |
| Continuous Stall Torque (100K) | 5.5 Nm |
| Peak Torque | 15.0 Nm |
| Standstill Continuous Current (100K) | 3.4 A |
| Max Current | 12.4 A |
| Mounting | IM B5 flange mount |
| Operating Temperature | -20 °C ~ +40 °C |
| Humidity | 5%–95% RH, non-condensing |
| Net Weight | Approx.4.0 kg |
| System Compatibility | IndraDrive M, HMV + HMS servo inverter series |
Key Features
- High Torque Density Compact Frame: C-length stator provides high continuous and peak torque in the MSK050 compact footprint for medium-load motion axes.
- Hiperface Multi-turn Absolute Encoder (M1): Absolute position feedback; no homing cycle required after power loss. High resolution for precise positioning.
- UG1 Rotatable Connector: Power and encoder plugs can rotate 240°, flexible cable routing for tight machine cabinet layout.
- IP65 Environmental Rating: Dust-proof and splash resistant, suitable for machine shop and factory automation environments.
- Smooth Shaft Without Brake: Low rotor inertia for rapid acceleration/deceleration; intended for systems fitted with external mechanical braking.
- Native IndraDrive Compatibility: Motor ID data stored inside the encoder, automatic parameter recognition by Rexroth IndraDrive M servo drives.
- Low Cogging Torque: Optimized stator winding design delivers ultra-smooth low-speed motion with minimal torque ripple.
- Maintenance-Free Natural Cooling: No cooling fan, reduces spare parts and fan-related failure risks.
Applications
- CNC machine tool feed axes, milling and lathe equipment
- Metal cutting, stamping and forming automation machinery
- Printing, packaging and converting high-speed production lines
- Gantry systems, pick-and-place and handling servo axes
- Metallurgical processing line positioning and tension control
Installation & Maintenance Notes
- Apply ESD protection when handling encoder connector and feedback cable.
- Align coupling precisely; avoid excessive radial or axial bearing loads.
- Use only Rexroth shielded power and encoder cables to suppress EMI noise.
- Check encoder wiring polarity before initial power-up to prevent position feedback faults.
- Periodically inspect bearing temperature, vibration and connector tightness.
- Keep motor housing surface clean and unobstructed for natural convection cooling.
- When replacing spare motor, verify encoder type, shaft form and full part number match drive configuration.
FAQ
Q: What is the difference between UG0 and UG1 suffix? A: UG0 = fixed straight connectors; UG1 = 240° rotatable power and encoder connectors for flexible cable routing.
Q: Does MSK050C-0300-NN-M1-UG1-NNNN have an internal brake? A: NN = no built-in holding brake. If brake is required, the code changes to MB or similar brake option.
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