The REXROTH R911393615 MSK075E-0300-NN-M1-UP2-NNNN is a high-performance synchronous servo motor developed for demanding industrial automation tasks that require precise motion, stable torque delivery, and dependable long-term service. As part of the Rexroth IndraDyn S MSK motor platform, this model is positioned for applications where a compact but powerful servo axis is needed, especially in machinery that depends on dynamic acceleration, accurate positioning, and strong system repeatability. Public product listings identify the exact order number R911393615 with the exact type code MSK075E-0300-NN-M1-UP2-NNNN, confirming that the commercial reference and the motor designation are aligned.
What makes this motor especially attractive is that it combines a relatively compact servo format with a performance level that is already suitable for more serious automation duties. The official Rexroth technical table for MSK075E-0300-NN lists 21.0 Nm continuous torque at standstill (60 K), 23.0 Nm continuous torque at standstill (100 K), 88.0 Nm maximum torque, and 5200 min⁻¹ maximum speed. Those values place the motor in a range that is well suited to packaging machinery, transfer systems, coordinated handling modules, assembly automation, indexing mechanisms, and other precision-driven industrial equipment where control quality matters as much as raw power.
Product Identification Table
| Item | Description | Source |
|---|---|---|
| Brand | Rexroth | |
| Order Number | R911393615 | |
| Model | MSK075E-0300-NN-M1-UP2-NNNN | |
| Product Family | IndraDyn S MSK | |
| Product Type | Synchronous servomotor | |
| Shaft Version | Shaft with keyway | |
| Feedback | Multiturn absolute Hiperface encoder | |
| Brake Version | Electrically released holding brake | |
| Brake Torque | 30 Nm | |
| Protection Class | IP65 | |
| Product Net Weight | 23.9 kg |
One important advantage of this configuration is that it is not merely a generic MSK075E motor, but a very specific combination of winding, encoder, shaft design, and holding-brake option. In procurement and replacement work, that distinction is critical. Servo motors that share the same frame size can still differ materially in encoder feedback, brake behavior, shaft interface, and inertia-related application fit. In this case, the exact code points to a multiturn feedback version, a shaft with keyway, and a holding-brake execution, which makes the motor far more suitable for controlled vertical axes, secure stopping conditions, or installations where load retention during shutdown is important.
Core Technical Data
| Parameter | Value | Source |
|---|---|---|
| Continuous torque at standstill, 60 K | 21.0 Nm | |
| Continuous current at standstill, 60 K | 13.9 A | |
| Continuous torque at standstill, 100 K | 23.0 Nm | |
| Continuous current at standstill, 100 K | 15.6 A | |
| Maximum torque | 88.0 Nm | |
| Maximum current | 63.9 A | |
| Torque constant at 20 °C | 1.63 Nm/A | |
| Winding inductivity | 4.460 mH | |
| Rotor moment of inertia | 0.00613 kg·m² | |
| Thermal time constant | 29.0 min | |
| Maximum speed | 5200 min⁻¹ | |
| Sound pressure level | <75 dB[A] | |
| Degree of protection | IP65 | |
| Ambient temperature in operation | 0 to 40 °C |
From an engineering perspective, the technical profile of this motor shows why it is useful in demanding servo systems. A motor with 23.0 Nm continuous standstill torque and 88.0 Nm peak torque can handle both steady-state load requirements and short-term dynamic peaks with authority. This is exactly the kind of behavior machine builders look for when selecting motors for fast indexing, precise stop-and-go movement, accurate speed regulation, or repeated start-stop cycles. The official rotor inertia value of 0.00613 kg·m² also matters because servo matching is not only about torque; it is also about how the motor responds dynamically when coupled to the load and the selected drive.
The feedback system is another major strength of this version. Public reseller specifications for this exact model describe it as using a multiturn absolute Hiperface encoder with 128 signal periods and an optical encoder technology. In practical terms, that means the motor is built for precise closed-loop control and stable position feedback, which is valuable in applications where referencing reliability, motion smoothness, and restart consistency are important. In automated machinery, that kind of encoder system supports more dependable positioning and generally simplifies high-accuracy axis control when used with a compatible Rexroth drive system.
Configuration-Oriented Interpretation
| Code Element | Interpretation | Source |
|---|---|---|
| MSK075E | MSK servo motor, frame size 075, motor length E | |
| 0300 | Winding / speed variant associated with the 0300 execution | |
| NN | The exact official technical table is for MSK075E-0300-NN | |
| M1 | Multiturn absolute Hiperface encoder | |
| UP2 | Keyed shaft plus holding brake execution | |
| NNNN | Standard design execution |
The weight deserves specific attention because it is often mishandled in commercial descriptions. The official Rexroth technical table for MSK075E-0300-NN shows a base weight of 22.5 kg, followed by (23.6) and (23.9), with the note that the bracketed values are for motors with holding brakes, sorted as holding brake 1 and holding brake 2. Since the exact commercial code here is UP2, and the exact product listing for this code states that it includes an electrically released holding brake, the most reasonable reading is that this specific motor weighs 23.9 kg. That is an inference, but it is a grounded one, and it is materially stronger than guessing from a neighboring MSK075 variant.
Commercial and Application Value
| Application Area | Suitability | Basis |
|---|---|---|
| Packaging and cartoning machinery | High | Strong torque reserve, accurate servo behavior |
| Transfer and indexing systems | High | 88 Nm peak torque and multiturn feedback |
| Assembly automation | High | Encoder precision and controlled dynamic response |
| Vertical axes or load-holding positions | Favorable | Holding brake execution on the exact model |
| Servo retrofits and spare-part replacement | High | Exact order number to type-code match |
For purchasing departments and maintenance teams, this model also has a practical lifecycle advantage. Because the order number, type code, brake version, and key performance values can be traced publicly, it is easier to verify replacement correctness before ordering. That reduces the risk of buying the wrong feedback version or the wrong brake execution, which is a common and expensive error in servo-motor procurement. For integrators, the combination of IP65 protection, substantial torque reserve, keyed shaft, and absolute feedback also makes the motor easier to justify in applications where uptime and repeatability matter more than minimal initial cost.
In broader system terms, the REXROTH R911393615 MSK075E-0300-NN-M1-UP2-NNNN is best understood as a precision automation motor with serious industrial capability rather than as a small generic servo unit. It provides a well-balanced mix of continuous torque, overload capacity, encoder sophistication, braking security, and protection level. That combination makes it a credible choice for machine builders who need reliable motion quality, as well as for end users who want a robust replacement motor that preserves original machine functionality without introducing uncertainty into the axis design.
Conclusion
The REXROTH R911393615 MSK075E-0300-NN-M1-UP2-NNNN is a technically strong and commercially clear servo motor for industrial motion-control systems. Based on the official MSK075E-0300-NN technical table and the exact product-code mapping, this model offers 21.0 Nm continuous torque at standstill (60 K), 23.0 Nm continuous torque at standstill (100 K), 88.0 Nm maximum torque, 5200 min⁻¹ maximum speed, IP65 protection, multiturn absolute Hiperface feedback, and an inferred configuration weight of 23.9 kg for the UP2 holding-brake version. For equipment that needs precise control, stable torque, and dependable stopping behavior, it is a well-specified and professionally credible Rexroth servo solution.
