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Good Price New Synchronous Servo Motor Rexroth R911315277 MSK050B-0300-NN-M2-UP1-RNNN For Precision Industrial Systems
| Place of Origin | Germany |
| Brand Name | REXROTH |
| Certification | CE |
| Model Number | R911315277 MSK050B-0300-NN-M2-UP1-RNNN |
The REXROTH R911315277 MSK050B-0300-NN-M2-UP1-RNNN is a compact synchronous servo motor from the Rexroth MSK / IndraDyn S series. It is designed for precision motion-control applications where small installation size, accurate feedback, stable torque output, and reliable industrial performance are required. Compared with larger MSK071, MSK100, and MSK101 motors, this MSK050B model is a smaller-frame servo motor, making it suitable for light-duty and medium-duty axes where space, weight, and dynamic response are important.
This product is identified by the Rexroth order number R911315277 and the complete type code MSK050B-0300-NN-M2-UP1-RNNN. Public supplier data confirms this exact order number and model as an IndraDyn S synchronous servo motor. The same listing also provides supporting technical documentation for the Rexroth IndraDrive and IndraDyn S MSK motor family.
The model code indicates an MSK050B frame size, 0300 winding, natural convection cooling, M2 encoder configuration, and UP1 mechanical configuration with holding brake 1. According to Rexroth MSK050B technical data, the MSK050B-0300-NN motor has a base mass of 4.0 kg without holding brake and 4.9 kg with holding brake. Because this exact model includes UP1, the recommended net product weight is approximately 4.9 kg.
Main Product Information
| Item | Specification |
|---|---|
| Brand | REXROTH |
| Order Number | R911315277 |
| Full Model | MSK050B-0300-NN-M2-UP1-RNNN |
| Product Family | MSK / IndraDyn S |
| Product Type | Synchronous Servo Motor |
| Frame Size | MSK050B |
| Winding Code | 0300 |
| Cooling Method | Natural Convection |
| Encoder Configuration | M2 Encoder System |
| Shaft Configuration | Shaft With Keyway and Shaft Sealing Ring |
| Holding Brake | Yes, Holding Brake 1 |
| Net Product Weight | 4.9 kg |
| Maximum Speed | 4300 rpm |
| Protection Rating | IP65 |
| Insulation Class | F |
| Sound Pressure Level | Less Than 75 dB(A) |
Type Code Interpretation
The full model code is important for replacement, procurement, and compatibility checking. A Rexroth MSK motor with the same frame size may still have a different encoder, shaft, brake, cooling method, or additional configuration. For this reason, the complete code MSK050B-0300-NN-M2-UP1-RNNN should be checked against the original motor nameplate before purchase.
| Code Section | Meaning |
|---|---|
| MSK | Rexroth IndraDyn S synchronous servo motor series |
| 050B | Motor size 050 with B-length construction |
| 0300 | Winding variant |
| NN | Natural convection cooling |
| M2 | Encoder configuration; must match the drive feedback system |
| UP1 | Shaft with keyway and shaft sealing ring, with holding brake 1 |
| RNNN | Additional configuration code |
The M2 encoder configuration is an important compatibility point. It should not be substituted casually with an M1, S1, or S2 feedback version unless the drive controller, cable, and machine parameters are checked. In servo systems, encoder mismatch can cause commissioning failure, incorrect feedback recognition, alarm conditions, or unstable operation.
Technical Performance Data
The MSK050B-0300-NN motor is designed for compact, accurate, and repeatable servo movement. Rexroth technical data for this motor lists 3.0 Nm continuous torque at standstill at 60 K, 3.4 Nm continuous torque at standstill at 100 K, and 9.0 Nm maximum torque. The maximum speed for the MSK050B-0300-NN version is 4300 rpm. These values make it suitable for small feed axes, indexing units, handling systems, test equipment, and compact automation modules.
| Technical Parameter | Value |
|---|---|
| Continuous Torque at Standstill 60 K | 3.0 Nm |
| Continuous Current at Standstill 60 K | 1.8 A |
| Continuous Torque at Standstill 100 K | 3.4 Nm |
| Continuous Current at Standstill 100 K | 2.0 A |
| Maximum Torque | 9.0 Nm |
| Maximum Current | 7.2 A |
| Torque Constant at 20 °C | 1.80 Nm/A |
| Voltage Constant at 20 °C | 111.0 V/min⁻¹ |
| Winding Resistance at 20 °C | 13.10 Ohm |
| Winding Inductivity | 76.400 mH |
| Leakage Capacitance | 2.1 nF |
| Number of Pole Pairs | 4 |
| Rotor Moment of Inertia Without Brake | 0.00028 kg·m² |
| Thermal Time Constant | 8.0 min |
| Maximum Speed | 4300 rpm |
| Sound Pressure Level | Less Than 75 dB(A) |
| Ambient Operating Temperature | 0 to 40 °C |
| Degree of Protection | IP65 |
| Insulation Class | F |
Product Weight and Packing Reference
The correct net-weight reference for REXROTH R911315277 MSK050B-0300-NN-M2-UP1-RNNN is approximately 4.9 kg. The base MSK050B motor mass is listed as 4.0 kg, while the value in brackets, 4.9 kg, applies to motors with holding brake. Since the complete model includes UP1, this product should be treated as a brake-equipped version.
| Weight Item | Reference Value |
|---|---|
| MSK050B Net Weight Without Holding Brake | Approximately 4.0 kg |
| MSK050B Net Weight With Holding Brake | Approximately 4.9 kg |
| Correct Net Weight for R911315277 | Approximately 4.9 kg |
| Gross Shipping Weight | Must Be Confirmed Before Shipment |
| Packing Note | Carton, foam protection, shaft cover, and export packaging may increase gross weight |
For product pages, quotations, and logistics planning, the net motor weight should be separated from the packed shipping weight. The motor itself is compact and relatively light compared with larger MSK models, but proper packaging is still necessary because the shaft, encoder interface, power connector, and brake wiring must be protected during transport. For international sales, the safest wording is net product weight: approximately 4.9 kg; gross packed weight to be confirmed before shipment.
Holding Brake Information
The UP1 configuration includes holding brake 1. In the MSK050 technical data, holding brake 1 is listed with 5.0 Nm holding torque, 24 V rated voltage, and 0.65 A rated current. The connection time is listed as 13 ms, and the disconnection time is listed as 43 ms.
| Brake Parameter | Value |
|---|---|
| Brake Type | Holding Brake 1 |
| Holding Torque | 5.0 Nm |
| Rated Voltage | 24 V DC ±10% |
| Rated Current | 0.65 A |
| Connection Time | 13 ms |
| Disconnection Time | 43 ms |
| Brake Moment of Inertia | 0.000107 kg·m² |
The holding brake is intended to hold the axis when the drive is disabled or when the machine is stopped. It should not be used as a repeated dynamic service brake. For vertical axes, suspended loads, or safety-related movement, the machine design should include proper safety logic, brake timing, and mechanical load verification.
Design Characteristics
The R911315277 MSK050B-0300-NN-M2-UP1-RNNN is useful where a compact servo motor is required but the axis still needs accurate feedback and a holding brake. Its small frame reduces installation weight, while the brake configuration supports axis holding in selected machine designs.
| Design Feature | Practical Benefit |
|---|---|
| Compact MSK050B Frame | Suitable for limited-space machine layouts |
| 0300 Winding | Provides controlled speed and torque behavior |
| Natural Convection Cooling | Simplifies installation without fan or liquid cooling |
| M2 Encoder Configuration | Supports precise feedback when matched with the correct drive |
| Shaft With Keyway | Helps provide positive torque transmission |
| Shaft Sealing Ring | Improves shaft-side protection in industrial environments |
| Holding Brake 1 | Helps hold the axis during stop or power-off conditions |
| IP65 Protection | Supports machine-mounted industrial use under correct installation |
Typical Application Areas
This servo motor is suitable for compact industrial axes requiring accurate motion control. It can be used in new machine construction, spare-part replacement, or retrofit projects when the complete motor configuration matches the existing system.
| Industry | Typical Application |
|---|---|
| Packaging Machinery | Small feed axis, labeling unit, sealing adjustment axis |
| Printing Equipment | Small roller drive, positioning axis, material feed mechanism |
| Handling Systems | Pick-and-place module, compact transfer axis, rotary positioning |
| Assembly Automation | Fixture movement, indexing table, small servo press |
| Test Equipment | Controlled actuator axis, laboratory automation, inspection station |
| Textile Machinery | Thread or fabric feed, winding control, compact synchronized axis |
| Electronics Manufacturing | Small positioning axis, feeder module, precision transfer mechanism |
| General Automation | Compact servo replacement and machine retrofit |
Installation and Compatibility Notes
Before replacing an existing motor with this unit, the complete model and order number should be checked. A motor that looks similar may still have a different brake, encoder, shaft, connector, or configuration code.
| Compatibility Check | Reason |
|---|---|
| Order Number R911315277 | Confirms the exact Rexroth material reference |
| Full Type Code | Prevents encoder, shaft, brake, or option mismatch |
| Encoder Configuration | M2 feedback must match the drive feedback interface |
| Brake Requirement | UP1 includes holding brake 1 |
| Shaft Type | Keyway shaft must match coupling and machine design |
| Cooling Method | NN natural convection must match thermal conditions |
| Cable Set | Power, encoder, and brake cables must be compatible |
| Drive Controller | Motor data must match the Rexroth drive parameter set |
Procurement and Inspection Guidance
For purchasing, the buyer should specify both R911315277 and MSK050B-0300-NN-M2-UP1-RNNN. If the motor is sourced as used or refurbished stock, the supplier should confirm the nameplate, encoder function, shaft condition, brake function, connector condition, bearing status, and insulation test result before shipment.
| Inspection Item | Recommended Check |
|---|---|
| Nameplate | Confirm R911315277 and MSK050B-0300-NN-M2-UP1-RNNN |
| Encoder | Verify M2 feedback and connector condition |
| Holding Brake | Test brake release and holding function |
| Shaft and Keyway | Check for wear, rust, deformation, or impact marks |
| Bearings | Check smooth rotation, noise, and mechanical play |
| Insulation | Perform insulation resistance testing before commissioning |
| Connectors | Inspect pins, seals, threads, and cable interface |
| Housing | Check for dents, corrosion, cracks, or improper repair |
| Packaging | Protect shaft, encoder connector, brake wiring, and power interface |
SEO-Oriented Product Summary
The REXROTH R911315277 MSK050B-0300-NN-M2-UP1-RNNN synchronous servo motor is a compact IndraDyn S motor for precision industrial automation and motion-control systems. It features an MSK050B frame, 0300 winding, natural convection cooling, M2 encoder configuration, shaft with keyway, shaft sealing ring, holding brake 1, IP65 protection, and an approximate net product weight of 4.9 kg. With 3.4 Nm continuous standstill torque at 100 K, 9.0 Nm maximum torque, 4300 rpm maximum speed, and a 5.0 Nm holding brake, this motor is suitable for packaging machinery, small handling systems, assembly automation, printing equipment, test equipment, textile machinery, electronics manufacturing, and compact servo-driven machine axes. For accurate replacement and procurement, buyers should verify both the Rexroth order number R911315277 and the complete model code MSK050B-0300-NN-M2-UP1-RNNN before ordering.
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