The REXROTH R911311855 MSK101D-0200-NN-S1-BP0-NNNN is a high-performance synchronous servo motor from the Rexroth IndraDyn S MSK motor family. It is designed for demanding industrial motion-control systems where stable torque output, accurate position feedback, strong mechanical construction, and long operating life are required. This model is commonly used in automated production equipment, CNC machinery, handling systems, packaging machines, printing equipment, converting machinery, and other servo-driven applications that require reliable dynamic response.
The complete product identification consists of two important parts: R911311855 is the order number, while MSK101D-0200-NN-S1-BP0-NNNN is the motor type code. For procurement, replacement, and technical matching, both should be kept together. The order number helps identify the exact Rexroth configuration, while the type code describes the motor frame size, winding, cooling design, encoder version, electrical connection, shaft arrangement, brake configuration, and design variant.
This motor belongs to the MSK101D frame size. In the MSK system, “101” indicates the motor size class, while “D” indicates the motor length. The 0200 winding is a lower-speed, higher-torque winding option compared with faster winding versions in the same frame. According to MSK101D technical data, the MSK101D-0200-NN version provides a continuous standstill torque of 50.0 Nm at 60 K, 57.0 Nm at 100 K, and a maximum torque of 160.0 Nm. The maximum speed for the MSK101D-0200-NN version is listed as 3,400 min-1. These values make the motor suitable for applications where strong torque and controlled acceleration are more important than very high rotational speed.
Basic Product Information
| Item | Description |
|---|---|
| Brand | REXROTH |
| Order Number | R911311855 |
| Model / Type Code | MSK101D-0200-NN-S1-BP0-NNNN |
| Product Type | Synchronous Servo Motor |
| Product Family | IndraDyn S MSK Series |
| Frame Size | MSK101D |
| Winding Code | 0200 |
| Cooling Version | NN Standard Cooling / Non-FN Version |
| Encoder Type | S1 Singleturn Encoder |
| Shaft Version | Keyway Shaft With Shaft Sealing Ring |
| Electrical Connector Position | B-side Connector |
| Holding Brake | Without Holding Brake |
| Design Version | Standard Design |
| Net Weight | 40.0 kg |
| Protection Class | IP65 |
| Insulation Class | 155 |
| Typical Application | Industrial Servo Drive And Automation Equipment |
The S1 encoder option provides position feedback for closed-loop servo operation. This allows the drive system to monitor motor position and speed accurately, which is essential for coordinated motion, repeatable indexing, axis positioning, and torque-controlled machine functions. The motor is designed for integration with Rexroth servo drive systems and is typically selected where precise electromechanical performance is needed in a compact but powerful package.
The BP0 section of the model code is especially important. It indicates that the motor is equipped with a shaft configuration using a keyway and shaft sealing ring, with the connector positioned on the B side, and without a holding brake. A no-brake configuration is often used when the driven axis does not require static load holding after power-off, or when external mechanical braking or vertical-axis holding is handled separately. This can reduce complexity and avoid unnecessary brake maintenance. The supplier listing also identifies the shaft as a keyway shaft and confirms that the holding brake is not included.
Technical Specification Overview
| Technical Parameter | Value |
|---|---|
| Continuous Torque At Standstill 60 K | 50.0 Nm |
| Continuous Current At Standstill 60 K | 22.2 A |
| Continuous Torque At Standstill 100 K | 57.0 Nm |
| Continuous Current At Standstill 100 K | 26.8 A |
| Continuous Torque At Standstill Surface | 75.0 Nm |
| Continuous Current At Standstill Surface | 33.3 A |
| Maximum Torque | 160.0 Nm |
| Maximum Current | 99.9 A |
| Torque Constant At 20 °C | 2.48 Nm/A |
| Voltage Constant At 20 °C | 152.0 V/min-1 |
| Winding Resistance At 20 °C | 0.35 ohm |
| Winding Inductivity | 6.000 mH |
| Number Of Pole Pairs | 4 |
| Rotor Moment Of Inertia | 0.00932 kg*m2 |
| Thermal Time Constant | 100.0 min |
| Maximum Speed | 3,400 min-1 |
| Sound Pressure Level | Less Than 75 dB[A] |
| Net Weight | 40.0 kg |
| Ambient Operating Temperature | 0 to 40 °C |
| Protection Rating | IP65 |
The technical values show that R911311855 MSK101D-0200-NN-S1-BP0-NNNN is not a small light-duty motor. With an approximate weight of 40.0 kg, it belongs to a higher-power servo motor class used for machine axes that need meaningful torque capacity. The weight also matters for logistics, machine installation, and replacement planning. When preparing shipment, the packed weight will usually be higher than the bare motor weight because of the carton, wooden case, protective foam, shaft protection, and accessories. For international delivery or spare-parts stocking, the estimated package weight should therefore be calculated separately from the listed motor mass.
From an engineering perspective, the IP65 protection rating is valuable in factory environments where dust, oil mist, coolant splash, and general industrial contamination may be present. IP65 does not mean the motor should be submerged, but it gives a strong level of protection for normal machine installation conditions. The shaft sealing ring also helps protect the motor bearing area from external contamination when the motor is installed correctly.
Application Areas
| Application Area | Typical Use |
|---|---|
| CNC Machinery | Feed axis, spindle-related auxiliary axis, tool handling |
| Packaging Equipment | Rotary sealing, indexing, cutting, synchronized motion |
| Printing And Converting Machines | Web tension control, roller drive, registration control |
| Material Handling | Lifting, transfer, positioning, conveyor servo axis |
| Plastic And Rubber Machinery | Extruder auxiliary axis, cutting, take-off, positioning |
| Robotics And Automation | Servo-controlled positioning and repeatable motion |
| Metalworking Equipment | Press feed, bending support, controlled rotary motion |
The MSK101D-0200 winding is suitable when the machine needs strong torque at moderate speed. This can be useful for heavier load axes, rotary tables, feed systems, driven rollers, or mechanical systems with higher inertia. Compared with smaller MSK motors, the MSK101D frame provides a stronger torque reserve and better suitability for demanding cycles. Compared with faster 0300 or 0450 winding versions, the 0200 version is more appropriate where speed is not the main selection target and where torque stability is more important.
Replacement And Selection Notes
When replacing a servo motor, the full type code must be checked carefully. A visually similar MSK101D motor may not be electrically or mechanically identical. The winding code, encoder type, shaft design, connector position, cooling version, and brake configuration can affect compatibility. For example, MSK101D-0200-NN-S1-BP0-NNNN should not be casually replaced with an MSK101D-0300 version or an FN liquid-cooled version unless the drive parameters, mechanical design, encoder feedback, cable interface, and application load have been reviewed.
The encoder option is also critical. A motor with a different encoder interface may not communicate correctly with the existing drive, even if the frame size and shaft dimensions appear similar. The same applies to brake configuration. A machine originally designed for a no-brake BP0 motor may accept another no-brake motor more easily, while a brake-equipped substitute can require additional wiring, drive configuration, and mechanical verification.
For buyers, repair engineers, and automation spare-parts teams, the safest purchasing format is:
| Field | Recommended Purchasing Information |
|---|---|
| Order Number | R911311855 |
| Full Model | MSK101D-0200-NN-S1-BP0-NNNN |
| Product Name | REXROTH IndraDyn S MSK Synchronous Servo Motor |
| Required Condition | New, Surplus New, Refurbished, Or Tested Used |
| Key Matching Points | Encoder, Shaft, Connector Side, Brake, Cooling Version |
| Net Weight | 40.0 kg |
Product Summary
The REXROTH R911311855 MSK101D-0200-NN-S1-BP0-NNNN is a robust synchronous servo motor built for industrial automation systems requiring high torque, precise feedback, and dependable long-term operation. Its MSK101D frame, 0200 winding, S1 encoder, B-side connector, keyway shaft, and no-brake configuration make it a specific and technically defined motor variant rather than a generic servo motor. With a maximum torque of 160.0 Nm, a maximum speed of 3,400 min-1, IP65 protection, and an approximate motor weight of 40.0 kg, this model is well suited for demanding servo-axis applications in machinery, manufacturing lines, and automated production equipment.
