The Rexroth R911309276 MSK050C-0300-NN-S1-UP0-NNNN is a compact IndraDyn S synchronous servo motor developed for precise, repeatable, and highly dynamic motion control in modern industrial automation systems. This exact order code is commonly identified in distributor listings as an MSK-series servo motor with natural convection cooling, a single-turn encoder, and no holding brake, while the official MSK050C-0300-NN technical data confirm the core performance platform behind the motor. For machine builders, maintenance teams, and industrial buyers, this model represents a practical balance of torque density, installation flexibility, reliable feedback, and long-term integration value in servo-driven machinery.
Product Overview
| Item | Description |
|---|---|
| Brand | Rexroth |
| Product Family | IndraDyn S |
| Order Number | R911309276 |
| Type Code | MSK050C-0300-NN-S1-UP0-NNNN |
| Product Type | Synchronous servo motor |
| Cooling Method | Natural convection |
| Encoder Type | Single-turn encoder |
| Holding Brake | No |
| Net Weight | 5.5 kg |
| Protection Class | IP65 |
| Maximum Speed | 4700 rpm |
| Maximum Torque | 15 Nm |
Specification note: the exact-code product pages identify this motor as an IndraDyn S synchronous servo motor with natural convection, single-turn encoder, and no holding brake. The official MSK050C-0300-NN technical data list 15 Nm maximum torque, 4700 rpm maximum speed, IP65 protection, and a motor weight of 5.5 kg for the non-brake version; the same table shows 6.3 kg for brake-equipped variants.
One reason this motor remains attractive in industrial projects is that it is not simply a generic servo motor, but part of a mature Rexroth motion platform used in demanding automation environments. The MSK050C size is intended for applications where engineers need a compact motor envelope but still require meaningful torque output, stable thermal behavior, and dependable encoder feedback. In practical terms, that means the motor can be used in packaging equipment, indexing units, handling systems, conveyor positioning, compact machine tools, and many other automated mechanisms that depend on accurate start-stop motion and controlled speed response.
Key Technical Data
| Parameter | Value |
|---|---|
| Continuous torque at standstill (60 K) | 5.0 Nm |
| Continuous current at standstill (60 K) | 3.1 A |
| Continuous torque at standstill (100 K) | 5.5 Nm |
| Continuous current at standstill (100 K) | 3.4 A |
| Maximum torque | 15.0 Nm |
| Maximum current | 12.4 A |
| Torque constant at 20 °C | 1.77 Nm/A |
| Winding resistance at 20 °C | 6.60 ohms |
| Winding inductivity | 46.100 mH |
| Number of pole pairs | 4 |
| Rotor inertia | 0.00033 kg·m² |
| Thermal time constant | 14.0 min |
| Maximum speed | 4700 min⁻¹ |
| Sound pressure level | <75 dB(A) |
| Operating temperature | 0 to 40 °C |
| Insulation class | 155 |
These core values come from the official MSK050C-0300-NN technical data sheet and define the performance envelope behind this servo motor platform. They show that the motor is designed for a useful combination of controllable standstill torque, moderate inertia, and stable response in precision motion applications rather than for simple constant-speed duty alone.
From a system design perspective, the Rexroth R911309276 is well suited to installations where machine accuracy, footprint, and controllability matter more than oversizing. The continuous standstill torque of 5.0 Nm at 60 K and the maximum torque of 15 Nm give integrators a clear indication that this motor can handle cyclic loads, acceleration demands, and intermittent peak events without becoming unnecessarily large. The 4700 rpm maximum speed also supports flexible use across applications that require both controlled low-speed positioning and faster production movement.
Another important advantage is protection and durability. Official technical data specify IP65 protection and insulation class 155, which are both highly relevant in real industrial environments. IP65 helps the motor resist dust ingress and water jets in typical factory conditions, while the insulation class supports thermal endurance under repeated operational load. For buyers evaluating lifecycle value, these points matter because they influence uptime, cleaning tolerance, installation confidence, and overall reliability in production equipment.
The motor weight is also a practical purchasing factor, especially for panel builders, machine designers, and service teams. For the non-brake version, the official reference weight is approximately 5.4 kg. This exact product code is listed without a holding brake, so 5.4 kg is the correct working figure for product content, technical comparison, and preliminary freight estimation. It is worth separating this from shipping gross weight, because packaging material, crate type, and export method can increase the final transport weight.
Why This Model Is Valuable in Industrial Automation
| Advantage | Practical Benefit |
|---|---|
| Compact MSK050C frame | Easier installation in space-limited machines |
| High peak torque versus size | Supports acceleration and short overload events |
| Single-turn encoder feedback | Stable position and speed feedback for controlled motion |
| Natural convection cooling | Simpler integration without forced cooling hardware |
| No holding brake | Suitable for systems where brake function is unnecessary |
| IP65 housing protection | Better suitability for normal industrial environments |
| Rexroth motion platform compatibility | Easier integration in established Rexroth drive systems |
In real-world automation projects, servo motors are selected not only by nameplate data but by how easily they fit the machine architecture. This is where the R911309276 MSK050C-0300-NN-S1-UP0-NNNN becomes commercially attractive. It offers the performance level expected from a branded Rexroth servo platform while keeping the configuration relatively straightforward: natural convection instead of more complex cooling, no holding brake where vertical load-holding is not required, and single-turn encoder feedback for stable closed-loop motion control. That makes it a practical option for cost-conscious but quality-sensitive machine designs.
For maintenance and replacement projects, the exact order number R911309276 is especially important. In industrial procurement, using the full Rexroth order number together with the complete type code reduces ambiguity and helps avoid errors in shaft, encoder, brake, or cooling configuration. Many servo motors appear visually similar, but incorrect substitution can create commissioning problems, tuning mismatches, or mounting incompatibility. Using the full designation R911309276 MSK050C-0300-NN-S1-UP0-NNNN in product pages, quotations, and technical communication improves search visibility and supports more accurate purchasing decisions.
This model is also relevant from an SEO and technical-content perspective because it contains exactly the kind of structured information industrial buyers search for online: Rexroth servo motor, IndraDyn S motor, R911309276, MSK050C-0300-NN-S1-UP0-NNNN, maximum torque, maximum speed, encoder type, cooling method, and motor weight. A strong product page should therefore combine application-oriented explanation with clean technical data, rather than relying on repetitive keyword stuffing. Search engines generally perform better with well-structured, specific, and technically coherent content, and this product naturally supports that approach because the order number and type code are precise and searchable.
Typical Applications
| Industry / Machine Type | Typical Use |
|---|---|
| Packaging machinery | Positioning, indexing, sealing, feeding axes |
| Conveyor automation | Speed-controlled transfer and stop-position control |
| Light machine tools | Controlled rotary or linear motion tasks |
| Robotics and handling units | Repetitive pick-and-place or transfer motion |
| Assembly equipment | Accurate torque and motion synchronization |
| General factory automation | Precision drive tasks in compact spaces |
In summary, the Rexroth R911309276 MSK050C-0300-NN-S1-UP0-NNNN is a compact and technically credible servo motor for users who need dependable motion control from a recognized industrial brand. Its official MSK050C-0300-NN performance data indicate 15 Nm maximum torque, 4700 rpm maximum speed, IP65 protection, and approximately 5.5 kg motor weight for the non-brake version. Combined with natural convection cooling, single-turn encoder feedback, and the established IndraDyn S platform, this motor is a strong choice for replacement demand, OEM integration, and industrial spare parts supply.
