The REXROTH R911312638 MSK030B-0900-NN-S1-UP0-NSNN is a compact IndraDyn S synchronous servo motor designed for high-speed and precision motion-control applications. It belongs to the Rexroth MSK motor family, which is widely used in automated machinery, compact positioning axes, packaging systems, electronic assembly equipment, laboratory machines, small handling modules, and high-dynamic servo applications.
For correct purchasing and replacement, the complete product reference should include both the order number R911312638 and the full type code MSK030B-0900-NN-S1-UP0-NSNN. The order number identifies the configured Rexroth material, while the type code defines the motor frame, winding, cooling method, encoder, connection style, shaft design, brake configuration, and design option. Public supplier listings confirm that R911312638 corresponds to MSK030B-0900-NN-S1-UP0-NSNN, described as an IndraDyn S synchronous servo motor.
Product Identification Table
| Item | Description |
|---|---|
| Brand | REXROTH |
| Order Number | R911312638 |
| Full Model | MSK030B-0900-NN-S1-UP0-NSNN |
| Product Type | Synchronous Servo Motor |
| Product Family | IndraDyn S MSK Series |
| Motor Size | MSK030 |
| Motor Length | B |
| Winding Code | 0900 |
| Cooling Method | Natural Convection |
| Encoder Type | S1 Optical Singleturn Hiperface Encoder |
| Encoder Resolution | 128 Signal Periods |
| Electrical Connection | Rotatable Plug Connection |
| Shaft Version | Shaft With Keyway And Shaft Sealing Ring |
| Holding Brake | Without Holding Brake |
| Design Feature | Standard And Explosion-Protection Related Design Code |
| Protection Rating | IP65 |
| Insulation Class | 155 |
| Net Weight | 1.3 kg Without Holding Brake |
| Typical Application | Compact High-Speed Servo Axis |
The MSK030B frame is one of the smaller sizes in the MSK range. It is intended for applications where the machine requires accurate servo control but has limited installation space. Compared with larger MSK061, MSK071, MSK100, or MSK101 motors, this model is much lighter and easier to install. Its compact structure makes it useful for small feed axes, light rotary positioning units, compact handling modules, laboratory automation mechanisms, and machine subassemblies where weight and space are important design limits.
Technical Specification Table
| Technical Parameter | Value |
|---|---|
| Motor Type | MSK030B-0900-NN |
| Continuous Torque At Standstill 60 K | 0.4 Nm |
| Continuous Current At Standstill 60 K | 1.5 A |
| Continuous Torque At Standstill 100 K | 0.4 Nm |
| Continuous Current At Standstill 100 K | 1.7 A |
| Maximum Torque | 1.8 Nm |
| Maximum Current | 6.8 A |
| Torque Constant At 20 °C | Approx. 0.25 Nm/A |
| Voltage Constant At 20 °C | Approx. 17 V/min-1 |
| Winding Resistance At 20 °C | 7.20 Ohm |
| Winding Inductivity | 8.100 mH |
| Discharge Capacity | 0.7 nF |
| Number Of Pole Pairs | 3 |
| Rotor Moment Of Inertia | Approx. 0.00001 kg*m2 |
| Maximum Speed | 9000 min-1 |
| Sound Pressure Level | Less Than 75 dB[A] |
| Operating Ambient Temperature | 0 To 40 °C |
| Degree Of Protection | IP65 |
| Insulation Class | 155 |
| Net Weight | 1.3 kg Without Brake |
Rexroth MSK030B-0900-NN technical data lists 0.4 Nm continuous torque at standstill, 1.8 Nm maximum torque, 6.8 A maximum current, and a maximum speed of 9000 min-1. The same technical data table lists the MSK030B weight as 1.3 kg for the no-brake configuration and 1.6 kg for the holding-brake version. Because this type code is UP0, the final “0” confirms that this motor is without a holding brake, so 1.3 kg is the appropriate bare motor weight reference.
Model Code Explanation
| Code Section | Meaning |
|---|---|
| MSK | Rexroth IndraDyn S Synchronous Servo Motor |
| 030 | Motor Size 030 |
| B | Motor Length B |
| 0900 | Winding Code For High-Speed Version |
| NN | Natural Convection Cooling |
| S1 | Optical Singleturn Hiperface Encoder With 128 Signal Periods |
| U | Rotatable Electrical Plug Connection |
| P | Shaft With Keyway And Shaft Sealing Ring |
| 0 | Without Holding Brake |
| NSNN | Special Design Code Related To Standard And Explosion-Protection Configuration |
The S1 encoder is an optical singleturn feedback system using the Hiperface interface with 128 signal periods. This encoder provides accurate rotor-position feedback for closed-loop servo control. It is especially suitable for compact servo axes where the controller needs reliable speed and position feedback during operation, but the application does not require multi-revolution absolute position retention after power-off. Public product data for this model also identifies the S1 encoder as optical, singleturn, Hiperface, and 128 signal periods.
The UP0 section is important for mechanical matching. The U indicates a rotatable connector arrangement, which helps simplify cable routing inside compact equipment. The P indicates a shaft with keyway and shaft sealing ring. A keyway shaft can provide positive torque transmission when used with suitable couplings, pulleys, or driven elements. The final 0 indicates no holding brake. This means the motor is suitable for axes where load holding is handled by the drive, mechanical system, gearbox, external brake, or where static holding after power-off is not required.
Weight And Installation Notes
| Item | Practical Reference |
|---|---|
| Bare Motor Weight | Approx. 1.3 kg |
| Brake Status | No Holding Brake |
| Brake-Equipped Weight Reference | Approx. 1.6 kg For Comparable Brake Version |
| Export Packing Weight | Must Be Confirmed Separately |
| Handling Method | Manual Handling Is Normally Practical |
| Installation Concern | Protect Shaft, Encoder Connector, And Flange Surface |
Although the R911312638 MSK030B-0900-NN-S1-UP0-NSNN is a small motor, correct handling is still important. The shaft, connector, encoder area, flange face, and sealing ring should be protected during storage, shipment, and installation. The listed 1.3 kg value refers to the bare motor. The shipping weight will normally be higher after adding carton packaging, anti-static protection, foam, shaft protection, labels, or wooden packing for export shipment.
For international supply, the packed size and gross weight should be confirmed separately. This is especially important when calculating air freight, express courier charges, or volumetric weight. A small servo motor may have low net weight but still require careful protective packaging to avoid shaft or encoder damage.
Application Areas
| Application Area | Typical Function |
|---|---|
| Electronic Assembly Equipment | Small positioning axis, component feeding, inspection movement |
| Packaging Machinery | Labeling axis, film feed, light indexing, small rotary drive |
| Laboratory Automation | Sample positioning, precision rotary movement, compact handling |
| Printing And Marking Machines | Small roller adjustment, feed control, print-head positioning |
| Semiconductor-Related Equipment | Light motion module, indexing mechanism, transfer axis |
| Medical And Test Equipment | Compact controlled movement and repeatable positioning |
| Robotic End Modules | Small wrist axis, gripper rotation, tool adjustment |
| General Automation | High-speed compact servo axis for light mechanical loads |
The 0900 winding is one of the defining features of this model. It supports a high maximum speed of 9000 min-1, which makes the motor suitable for fast cyclic movements and light-load high-speed servo tasks. However, because the motor frame is compact, it should not be selected for heavy-load torque applications. The rated torque and maximum torque should be checked carefully against the actual mechanical load, inertia, gear ratio, duty cycle, and acceleration profile.
Engineering Selection Notes
| Check Point | Why It Matters |
|---|---|
| Full Type Code | Prevents confusion with similar MSK030B variants |
| Order Number | Confirms the exact Rexroth material configuration |
| Encoder Type | Must match the servo drive feedback interface |
| Shaft Version | Affects coupling, pulley, and mechanical mounting compatibility |
| Brake Option | This version has no holding brake |
| Connector Style | Affects cable routing in compact machine frames |
| Maximum Speed | Important for high-speed applications |
| Motor Weight | Useful for mounting, handling, and shipping estimates |
| Design Suffix | Must be checked when replacing NSNN or NNNN versions |
When replacing this motor, it is not enough to match only MSK030B-0900. A similar motor can differ in encoder type, shaft version, brake option, connector orientation, or design suffix. For example, UP0 and UP1 are not the same because UP1 includes a holding brake while UP0 does not. Similarly, UG0 and UP0 differ in shaft configuration. The replacement should therefore be checked against the full identification: R911312638 MSK030B-0900-NN-S1-UP0-NSNN.
The NSNN suffix should also be preserved during ordering. Some MSK030B variants may end with NNNN, while this exact model ends with NSNN. In replacement work, the safest approach is to match the full code from the motor nameplate or original equipment documentation, especially when the motor is used in an area where special design requirements may apply.
Procurement And Replacement Format
| Required Field | Recommended Entry |
|---|---|
| Order Number | R911312638 |
| Full Model | MSK030B-0900-NN-S1-UP0-NSNN |
| Product Name | Rexroth IndraDyn S Synchronous Servo Motor |
| Weight Reference | Approx. 1.3 kg |
| Encoder | S1 Optical Singleturn Hiperface Encoder |
| Shaft | Keyway Shaft With Shaft Sealing Ring |
| Brake | Without Holding Brake |
| Cooling | Natural Convection |
| Protection | IP65 |
| Recommended Condition Description | New, Surplus New, Refurbished, Or Tested Used |
For quotation, spare-parts supply, and maintenance records, the safest product description is:
| Order Number | Full Model |
|---|---|
| R911312638 | MSK030B-0900-NN-S1-UP0-NSNN |
Product Summary
The REXROTH R911312638 MSK030B-0900-NN-S1-UP0-NSNN is a compact high-speed IndraDyn S synchronous servo motor for precision industrial motion control. It combines the MSK030B frame, 0900 winding, natural-convection cooling, S1 optical singleturn Hiperface encoder, rotatable plug connection, keyway shaft with shaft sealing ring, no holding brake, and NSNN design suffix. With 0.4 Nm continuous standstill torque, 1.8 Nm maximum torque, 6.8 A maximum current, 9000 min-1 maximum speed, IP65 protection, and an approximate bare motor weight of 1.3 kg, this motor is well suited for compact, fast, and accurate servo-axis applications.
