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New Original Precision Synchronous Servo Motor Rexroth R911312910 MSK100B-0300-NN-M1-BG0-NNNN For Industrial Control
| Place of Origin | Germany |
| Brand Name | REXROTH |
| Certification | CE |
| Model Number | R911312910 MSK100B-0300-NN-M1-BG0-NNNN |
The REXROTH R911312910 MSK100B-0300-NN-M1-BG0-NNNN is a high-performance synchronous servo motor from the Rexroth MSK / IndraDyn S series. It is designed for industrial motion-control applications that require accurate positioning, reliable torque response, compact power density, and long-term stability in automated machinery. Compared with the larger MSK100D version, this MSK100B model provides a more compact frame length while still offering strong torque performance for medium-to-heavy servo axes.
The full model MSK100B-0300-NN-M1-BG0-NNNN identifies a motor with MSK100B frame size, 0300 winding, natural convection cooling, multiturn encoder feedback, and a plain shaft with shaft sealing ring without holding brake. The order number R911312910 should always be used together with the full type code when confirming replacement compatibility, checking inventory, or preparing a purchase order.
According to Rexroth IndraDyn S MSK technical data, the MSK100B-0300-NN configuration provides 28.0 Nm continuous standstill torque at 60 K, 33.0 Nm continuous standstill torque at 100 K, 42.0 Nm continuous torque with surface cooling reference, 102.0 Nm maximum torque, and a maximum speed listed in the MSK100B table. The same technical table gives the MSK100B motor mass as 35.0 kg without holding brake and 36.0 kg with holding brake. Since this exact type code ends with BG0, it is a non-brake version, so the recommended net motor weight is approximately 35.0 kg.
Main Product Information
| Item | Specification |
|---|---|
| Brand | REXROTH |
| Order Number | R911312910 |
| Full Model | MSK100B-0300-NN-M1-BG0-NNNN |
| Product Family | MSK / IndraDyn S |
| Product Type | Synchronous Servo Motor |
| Frame Size | MSK100B |
| Winding Code | 0300 |
| Cooling Method | Natural Convection |
| Encoder Type | Multiturn Encoder |
| Shaft Version | Plain Shaft With Shaft Sealing Ring |
| Holding Brake | No |
| Net Product Weight | 35.0 kg |
| Brake-Version Net Weight | 36.0 kg |
| Degree of Protection | IP65 |
| Insulation Class | F |
| Sound Pressure Level | Less Than 75 dB(A) |
Type Code Explanation
The Rexroth MSK type code should be checked carefully because small changes in the model code can affect the motor’s mechanical and electrical compatibility. A motor with the same basic frame size may have a different encoder, brake, shaft style, or cooling configuration.
| Code Section | Meaning |
|---|---|
| MSK | Rexroth IndraDyn S synchronous servo motor series |
| 100B | Motor size 100 with B-length construction |
| 0300 | Winding variant |
| NN | Natural convection cooling |
| M1 | Multiturn encoder configuration |
| BG0 | Plain shaft with shaft sealing ring, without holding brake |
| NNNN | Standard additional configuration |
The M1 multiturn encoder is important for applications where the machine benefits from absolute position information over multiple shaft revolutions. In many automated systems, this can reduce homing procedures, improve restart behavior after shutdown, and support more reliable machine recovery after maintenance or power interruption. The BG0 configuration means this motor does not include a motor-integrated holding brake. This is suitable for horizontal axes or machine designs where axis holding is handled by mechanical structure, drive logic, or an external braking system.
Technical Performance Data
The MSK100B-0300-NN motor is positioned as a strong mid-range motor within the MSK100 family. It is lighter and shorter than the MSK100D version, but it still provides a maximum torque level suitable for demanding industrial axes. Rexroth’s MSK100B table lists the following electrical and mechanical reference data for the MSK100B-0300-NN winding variant.
| Technical Parameter | Value |
|---|---|
| Continuous Torque at Standstill 60 K | 28.0 Nm |
| Continuous Current at Standstill 60 K | 17.4 A |
| Continuous Torque at Standstill 100 K | 33.0 Nm |
| Continuous Current at Standstill 100 K | 20.5 A |
| Continuous Torque With Surface Cooling Reference | 42.0 Nm |
| Continuous Current With Surface Cooling Reference | 26.1 A |
| Maximum Torque | 102.0 Nm |
| Maximum Current | 78.3 A |
| Torque Constant at 20 °C | 1.77 Nm/A |
| Voltage Constant at 20 °C | 108.5 V/min⁻¹ |
| Winding Resistance at 20 °C | 0.43 Ohm |
| Winding Inductance | 5.500 mH |
| Number of Pole Pairs | 4 |
| Rotor Moment of Inertia Without Brake | 0.01920 kg·m² |
| Thermal Time Constant | 40.0 min |
| Sound Pressure Level | Less Than 75 dB(A) |
| Operating Ambient Temperature | 0 to 40 °C |
| Degree of Protection | IP65 |
| Insulation Class | F |
Product Weight and Logistics Reference
For this exact model, the most suitable weight reference is 35.0 kg net motor weight. The Rexroth MSK100B technical table gives 35.0 kg as the mass without holding brake and 36.0 kg as the mass with holding brake. Because R911312910 MSK100B-0300-NN-M1-BG0-NNNN has no holding brake, the brake-free value should be used for the product listing.
| Weight Item | Reference Value |
|---|---|
| MSK100B Net Weight Without Holding Brake | Approximately 35.0 kg |
| MSK100B Net Weight With Holding Brake | Approximately 36.0 kg |
| Correct Product Weight for R911312910 | Approximately 35.0 kg |
| Packing Weight | Must Be Confirmed Before Shipment |
| Export Packing Note | Wooden case or reinforced packing may increase gross weight |
The product weight should not be confused with the gross shipping weight. For international transport, the final packed weight may include wooden-case packaging, internal foam support, shaft protection, connector protection, anti-moisture wrapping, and pallet reinforcement. For a sales page or Google-indexed product description, it is better to state the net motor weight as approximately 35.0 kg and mention that the gross shipping weight depends on the packing method.
Design Characteristics
The REXROTH R911312910 MSK100B-0300-NN-M1-BG0-NNNN is built for controlled industrial movement rather than ordinary constant-speed motor operation. Its synchronous servo construction allows the motor to work with compatible Rexroth drive systems for precise torque, velocity, and position control. The motor’s high torque density makes it useful where machine builders need strong output in a limited installation space.
| Design Feature | Practical Benefit |
|---|---|
| MSK100B Frame | Provides strong torque in a shorter MSK100 housing than longer versions |
| 0300 Winding | Balanced torque and speed characteristics for industrial axes |
| Multiturn Encoder | Supports absolute position feedback over multiple revolutions |
| Natural Convection Cooling | Simplifies installation where external cooling is not required |
| Plain Shaft With Seal | Suitable for coupling-based installations with shaft-side protection |
| No Holding Brake | Reduces weight and suits axes that do not require motor-integrated holding |
| IP65 Protection | Helps protect against dust and water jets under correct installation |
| Low Noise Reference | Sound pressure level below 75 dB(A) in the technical data |
Application Fields
This servo motor is suitable for medium-to-heavy-duty machine axes where accurate motion, strong torque output, and repeatable control are required. It can be used in new machine construction, retrofit projects, and spare-part replacement when the electrical and mechanical configuration matches the original system.
| Industry | Typical Application |
|---|---|
| Packaging Machinery | Main feed axis, rotary station, sealing movement, cutting axis |
| Printing Machinery | Roller synchronization, web feed, tension-related motion |
| Machine Tools | Feed axis, auxiliary positioning, loading and unloading systems |
| Plastics Machinery | Cutting unit, winding axis, extrusion support movement |
| Handling Equipment | Transfer mechanism, rotary table, gantry movement |
| Converting Machinery | Slitting, laminating, winding, and synchronized feed systems |
| Metalworking Equipment | Positioning axis, material feed, forming auxiliary movement |
| General Automation | Servo axis replacement and machine modernization |
Installation and Compatibility Notes
When replacing an existing motor, the full model code should be checked instead of relying only on the visible frame size. The motor should be compared with the original nameplate, drive parameters, encoder interface, shaft design, cable connection, and machine documentation.
| Compatibility Check | Reason |
|---|---|
| Order Number R911312910 | Confirms the exact material reference |
| Full Type Code | Prevents encoder, shaft, brake, or cooling mismatch |
| Encoder Type | Must match the drive feedback interface and parameter set |
| Shaft Version | BG0 indicates plain shaft with shaft sealing ring |
| Brake Requirement | This version has no holding brake |
| Drive Controller | Should be compatible with the MSK100B-0300 motor data |
| Motor Cable Set | Power and encoder cables must match the connection system |
| Mechanical Load | Axis torque and inertia must be checked before installation |
For vertical axes, lifting axes, or axes exposed to gravity-driven back movement, this non-brake version may not be the safest direct choice unless the machine uses an external brake or another holding mechanism. For horizontal axes, rotary drives, feed systems, and mechanically supported loads, the non-brake configuration can be a practical and lighter solution.
Procurement and Inspection Guidance
For purchasing, the buyer should specify both R911312910 and MSK100B-0300-NN-M1-BG0-NNNN. If the motor is purchased as used or refurbished stock, it is advisable to request a nameplate photo, encoder test confirmation, shaft inspection, bearing condition report, insulation test result, and packing confirmation before shipment.
| Inspection Item | Recommended Check |
|---|---|
| Nameplate | Must match R911312910 and MSK100B-0300-NN-M1-BG0-NNNN |
| Shaft | Check for wear, corrosion, impact marks, or coupling damage |
| Encoder | Confirm multiturn feedback function and connector condition |
| Bearings | Check rotation smoothness, noise, and mechanical play |
| Housing | Check for cracks, heavy dents, or signs of improper repair |
| Insulation | Test insulation resistance before installation |
| Connector Area | Inspect pins, seals, threads, and cable connection surfaces |
| Packaging | Use proper shaft and connector protection for export transport |
SEO-Oriented Product Summary
The REXROTH R911312910 MSK100B-0300-NN-M1-BG0-NNNN synchronous servo motor is a reliable MSK100B IndraDyn S motor for industrial automation and precision motion-control systems. It features a 0300 winding, natural convection cooling, multiturn encoder, plain shaft with shaft sealing ring, no holding brake, IP65 protection, and an approximate net product weight of 35.0 kg. With 33.0 Nm continuous standstill torque at 100 K, 42.0 Nm continuous torque with surface cooling reference, and 102.0 Nm maximum torque, this motor is suitable for packaging machinery, printing equipment, machine tools, plastics machinery, handling systems, converting machinery, and other servo-controlled production equipment. For accurate replacement and procurement, buyers should verify the order number R911312910 and the full model code MSK100B-0300-NN-M1-BG0-NNNN before purchase.
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